Some miscellaneous updates to main help, for new features and otherwise.

[freeciv.git] / server / settings.c

/********************************************************************** 
 Freeciv - Copyright (C) 1996-2004 - The Freeciv Project
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
***********************************************************************/

#ifdef HAVE_CONFIG_H
#include <fc_config.h>
#endif

/* utility */
#include "astring.h"
#include "fcintl.h"
#include "game.h"
#include "ioz.h"
#include "log.h"
#include "registry.h"
#include "shared.h"
#include "string_vector.h"

/* common */
#include "map.h"

/* server */
#include "gamehand.h"
#include "ggzserver.h"
#include "maphand.h"
#include "notify.h"
#include "plrhand.h"
#include "report.h"
#include "settings.h"
#include "srv_main.h"
#include "stdinhand.h"

/* The following classes determine what can be changed when.
 * Actually, some of them have the same "changeability", but
 * different types are separated here in case they have
 * other uses.
 * Also, SSET_GAME_INIT/SSET_RULES separate the two sections
 * of server settings sent to the client.
 * See the settings[] array and setting_is_changeable() for what
 * these correspond to and explanations.
 */
enum sset_class {
  SSET_MAP_SIZE,
  SSET_MAP_GEN,
  SSET_MAP_ADD,
  SSET_PLAYERS,
  SSET_GAME_INIT,
  SSET_RULES,
  SSET_RULES_FLEXIBLE,
  SSET_META
};

typedef bool (*bool_validate_func_t) (bool value, struct connection *pconn,
                                      char *reject_msg,
                                      size_t reject_msg_len);
typedef bool (*int_validate_func_t) (int value, struct connection *pconn,
                                     char *reject_msg,
                                     size_t reject_msg_len);
typedef bool (*string_validate_func_t) (const char * value,
                                        struct connection *pconn,
                                        char *reject_msg,
                                        size_t reject_msg_len);
typedef bool (*enum_validate_func_t) (int value, struct connection *pconn,
                                      char *reject_msg,
                                      size_t reject_msg_len);
typedef bool (*bitwise_validate_func_t) (unsigned value,
                                         struct connection *pconn,
                                         char *reject_msg,
                                         size_t reject_msg_len);

typedef void (*action_callback_func_t) (const struct setting *pset);
typedef const struct sset_val_name * (*val_name_func_t) (int value);

struct setting {
  const char *name;
  enum sset_class sclass;
  bool to_client;

  /*
   * Sould be less than 42 chars (?), or shorter if the values may
   * have more than about 4 digits. Don't put "." on the end.
   */
  const char *short_help;

  /*
   * May be empty string, if short_help is sufficient. Need not
   * include embedded newlines (but may, for formatting); lines will
   * be wrapped (and indented) automatically. Should have punctuation
   * etc, and should end with a "."
   */
  const char *extra_help;
  enum sset_type stype;
  enum sset_category scategory;
  enum sset_level slevel;

  /*
   * About the *_validate functions: If the function is non-NULL, it
   * is called with the new value, and returns whether the change is
   * legal. The char * is an error message in the case of reject.
   */

  union {
    /*** bool part ***/
    struct {
      bool *const pvalue;
      const bool default_value;
      const bool_validate_func_t validate;
      const val_name_func_t name;
      bool game_value;
    } boolean;
    /*** int part ***/
    struct {
      int *const pvalue;
      const int default_value;
      const int min_value;
      const int max_value;
      const int_validate_func_t validate;
      int game_value;
    } integer;
    /*** string part ***/
    struct {
      char *const value;
      const char *const default_value;
      const size_t value_size;
      const string_validate_func_t validate;
      char *game_value;
    } string;
    /*** enumerator part ***/
    struct {
      void *const pvalue;
      const int store_size;
      const int default_value;
      const enum_validate_func_t validate;
      const val_name_func_t name;
      int game_value;
    } enumerator;
    /*** bitwise part ***/
    struct {
      unsigned *const pvalue;
      const unsigned default_value;
      const bitwise_validate_func_t validate;
      const val_name_func_t name;
      unsigned game_value;
    } bitwise;
  };

  /* action function */
  const action_callback_func_t action;

  /* ruleset lock for game settings */
  bool locked;
};

static struct {
  bool init;
  struct setting_list *level[OLEVELS_NUM];
} setting_sorted = { .init = FALSE };

static void setting_set_to_default(struct setting *pset);
static bool setting_ruleset_one(struct section_file *file,
                                const char *name, const char *path);
static void setting_game_set(struct setting *pset, bool init);
static void setting_game_free(struct setting *pset);
static void setting_game_restore(struct setting *pset);

static void settings_list_init(void);
static void settings_list_free(void);
int settings_list_cmp(const struct setting *const *pset1,
                      const struct setting *const *pset2);

#define settings_snprintf(_buf, _buf_len, format, ...)                      \
  if (_buf != NULL) {                                                       \
    fc_snprintf(_buf, _buf_len, format, ## __VA_ARGS__);                    \
  }

static bool set_enum_value(struct setting *pset, int val);
static int read_enum_value(const struct setting *pset);

/****************************************************************************
  Enumerator name accessors.

  Important note about compatibility:
  1) you cannot modify the support name of an existant value. However, in a
     developpement, you can modify it if it wasn't included in any stable
     branch before.
  2) Take care of modifiying the pretty name of an existant value: make sure
  to modify the help texts which are using it.
****************************************************************************/

#define NAME_CASE(_val, _support, _pretty)                                  \
  case _val:                                                                \
    {                                                                       \
      static const struct sset_val_name name = { _support, _pretty };       \
      return &name;                                                         \
    }

/****************************************************************************
  Map size definition setting names accessor. This setting has an
  hard-coded depedence in "server/meta.c".
****************************************************************************/
static const struct sset_val_name *mapsize_name(int mapsize)
{
  switch (mapsize) {
  NAME_CASE(MAPSIZE_FULLSIZE, "FULLSIZE", N_("Number of tiles"));
  NAME_CASE(MAPSIZE_PLAYER, "PLAYER", N_("Tiles per player"));
  NAME_CASE(MAPSIZE_XYSIZE, "XYSIZE", N_("Width and height"));
  }
  return NULL;
}

/****************************************************************************
  Topology setting names accessor.
****************************************************************************/
static const struct sset_val_name *topology_name(int topology_bit)
{
  switch (1 << topology_bit) {
  NAME_CASE(TF_WRAPX, "WRAPX", N_("Wrap East-West"));
  NAME_CASE(TF_WRAPY, "WRAPY", N_("Wrap North-South"));
  NAME_CASE(TF_ISO, "ISO", N_("Isometric"));
  NAME_CASE(TF_HEX, "HEX", N_("Hexagonal"));
  }
  return NULL;
}

/****************************************************************************
  Generator setting names accessor.
****************************************************************************/
static const struct sset_val_name *generator_name(int generator)
{
  switch (generator) {
  NAME_CASE(MAPGEN_SCENARIO, "SCENARIO", N_("Scenario map"));
  NAME_CASE(MAPGEN_RANDOM, "RANDOM", N_("Fully random height"));
  NAME_CASE(MAPGEN_FRACTAL, "FRACTAL", N_("Pseudo-fractal height"));
  NAME_CASE(MAPGEN_ISLAND, "ISLAND", N_("Island-based"));
  }
  return NULL;
}

/****************************************************************************
  Start position setting names accessor.
****************************************************************************/
static const struct sset_val_name *startpos_name(int startpos)
{
  switch (startpos) {
  NAME_CASE(MAPSTARTPOS_DEFAULT, "DEFAULT",
            N_("Generator's choice"));
  NAME_CASE(MAPSTARTPOS_SINGLE, "SINGLE",
            N_("One player per continent"));
  NAME_CASE(MAPSTARTPOS_2or3, "2or3",
            N_("Two or three players per continent"));
  NAME_CASE(MAPSTARTPOS_ALL, "ALL",
            N_("All players on a single continent"));
  NAME_CASE(MAPSTARTPOS_VARIABLE, "VARIABLE",
            N_("Depending on size of continents"));
  }
  return NULL;
}

/****************************************************************************
  Autosaves setting names accessor.
****************************************************************************/
static const struct sset_val_name *autosaves_name(int autosaves_bit)
{
  switch (autosaves_bit) {
  NAME_CASE(AS_TURN, "TURN", N_("New turn"));
  NAME_CASE(AS_GAME_OVER, "GAMEOVER", N_("Game over"));
  NAME_CASE(AS_QUITIDLE, "QUITIDLE", N_("No player connections"));
  NAME_CASE(AS_INTERRUPT, "INTERRUPT", N_("Server interrupted"));
  };

  return NULL;
}

/****************************************************************************
  Borders setting names accessor.
****************************************************************************/
static const struct sset_val_name *borders_name(int borders)
{
  switch (borders) {
  NAME_CASE(BORDERS_DISABLED, "DISABLED", N_("Disabled"));
  NAME_CASE(BORDERS_ENABLED, "ENABLED", N_("Enabled"));
  NAME_CASE(BORDERS_SEE_INSIDE, "SEE_INSIDE",
            N_("See everything inside borders"));
  NAME_CASE(BORDERS_EXPAND, "EXPAND",
            N_("Borders expand to unknown, revealing tiles"));
  }
  return NULL;
}

/****************************************************************************
  Player colors configuration setting names accessor.
****************************************************************************/
static const struct sset_val_name *plrcol_name(int plrcol)
{
  switch (plrcol) {
  NAME_CASE(PLRCOL_PLR_ORDER,    "PLR_ORDER",    N_("Per-player, in order"));
  NAME_CASE(PLRCOL_PLR_RANDOM,   "PLR_RANDOM",   N_("Per-player, random"));
  NAME_CASE(PLRCOL_PLR_SET,      "PLR_SET",      N_("Set manually"));
  NAME_CASE(PLRCOL_TEAM_ORDER,   "TEAM_ORDER",   N_("Per-team, in order"));
  NAME_CASE(PLRCOL_NATION_ORDER, "NATION_ORDER", N_("Per-nation, in order"));
  }
  return NULL;
}

/****************************************************************************
  Diplomacy setting names accessor.
****************************************************************************/
static const struct sset_val_name *diplomacy_name(int diplomacy)
{
  switch (diplomacy) {
  NAME_CASE(DIPLO_FOR_ALL, "ALL", N_("Enabled for everyone"));
  NAME_CASE(DIPLO_FOR_HUMANS, "HUMAN",
            N_("Only allowed between human players"));
  NAME_CASE(DIPLO_FOR_AIS, "AI", N_("Only allowed between AI players"));
  NAME_CASE(DIPLO_NO_AIS, "NOAI", N_("Only allowed when human involved"));
  NAME_CASE(DIPLO_NO_MIXED, "NOMIXED", N_("Only allowed between two humans, or two AI players"));
  NAME_CASE(DIPLO_FOR_TEAMS, "TEAM", N_("Restricted to teams"));
  NAME_CASE(DIPLO_DISABLED, "DISABLED", N_("Disabled for everyone"));
  }
  return NULL;
}

/****************************************************************************
  City names setting names accessor.
****************************************************************************/
static const struct sset_val_name *citynames_name(int citynames)
{
  switch (citynames) {
  NAME_CASE(CNM_NO_RESTRICTIONS, "NO_RESTRICTIONS", N_("No restrictions"));
  NAME_CASE(CNM_PLAYER_UNIQUE, "PLAYER_UNIQUE", N_("Unique to a player"));
  NAME_CASE(CNM_GLOBAL_UNIQUE, "GLOBAL_UNIQUE", N_("Globally unique"));
  NAME_CASE(CNM_NO_STEALING, "NO_STEALING", N_("No city name stealing"));
  }
  return NULL;
}

/****************************************************************************
  Barbarian setting names accessor.
****************************************************************************/
static const struct sset_val_name *barbarians_name(int barbarians)
{
  switch (barbarians) {
  NAME_CASE(BARBS_DISABLED, "DISABLED", N_("No barbarians"));
  NAME_CASE(BARBS_HUTS_ONLY, "HUTS_ONLY", N_("Only in huts"));
  NAME_CASE(BARBS_NORMAL, "NORMAL", N_("Normal rate of appearance"));
  NAME_CASE(BARBS_FREQUENT, "FREQUENT", N_("Frequent barbarian uprising"));
  NAME_CASE(BARBS_HORDES, "HORDES", N_("Raging hordes"));
  }
  return NULL;
}

/****************************************************************************
  Revealmap setting names accessor.
****************************************************************************/
static const struct sset_val_name *revealmap_name(int bit)
{
  switch (1 << bit) {
  NAME_CASE(REVEAL_MAP_START, "START", N_("Reveal map at game start"));
  NAME_CASE(REVEAL_MAP_DEAD, "DEAD", N_("Unfog map for dead players"));
  }
  return NULL;
}

/****************************************************************************
  Airlifting style setting names accessor.
****************************************************************************/
static const struct sset_val_name *airliftingstyle_name(int bit)
{
  switch (1 << bit) {
  NAME_CASE(AIRLIFTING_ALLIED_SRC, "FROM_ALLIES",
            N_("Allows units to be airlifted from allied cities"));
  NAME_CASE(AIRLIFTING_ALLIED_DEST, "TO_ALLIES",
            N_("Allows units to be airlifted to allied cities"));
  NAME_CASE(AIRLIFTING_UNLIMITED_SRC, "SRC_UNLIMITED",
            N_("Unlimited units from source city"));
  NAME_CASE(AIRLIFTING_UNLIMITED_DEST, "DEST_UNLIMITED",
            N_("Unlimited units to destination city"));
  }
  return NULL;
}

/****************************************************************************
  Phase mode names accessor.
****************************************************************************/
static const struct sset_val_name *phasemode_name(int phasemode)
{
  switch (phasemode) {
  NAME_CASE(PMT_CONCURRENT, "ALL", N_("All players move concurrently"));
  NAME_CASE(PMT_PLAYERS_ALTERNATE,
            "PLAYER", N_("All players alternate movement"));
  NAME_CASE(PMT_TEAMS_ALTERNATE, "TEAM", N_("Team alternate movement"));
  }
  return NULL;
}

/****************************************************************************
  Savegame compress type names accessor.
****************************************************************************/
static const struct sset_val_name *
compresstype_name(enum fz_method compresstype)
{
  switch (compresstype) {
  NAME_CASE(FZ_PLAIN, "PLAIN", N_("No compression"));
#ifdef HAVE_LIBZ
  NAME_CASE(FZ_ZLIB, "LIBZ", N_("Using zlib (gzip format)"));
#endif
#ifdef HAVE_LIBBZ2
  NAME_CASE(FZ_BZIP2, "BZIP2", N_("Using bzip2"));
#endif
#ifdef HAVE_LIBLZMA
  NAME_CASE(FZ_XZ, "XZ", N_("Using xz"));
#endif
  }
  return NULL;
}

/****************************************************************************
  Names accessor for boolean settings (disable/enable).
****************************************************************************/
static const struct sset_val_name *bool_name(int enable)
{
  switch (enable) {
  NAME_CASE(FALSE, "DISABLED", N_("disabled"));
  NAME_CASE(TRUE, "ENABLED", N_("enabled"));
  }
  return NULL;
}

#undef NAME_CASE


/*************************************************************************
  Action callback functions.
*************************************************************************/

/*************************************************************************
  (De)initialze the score log.
*************************************************************************/
static void scorelog_action(const struct setting *pset)
{
  if (*pset->boolean.pvalue) {
    log_civ_score_init();
  } else {
    log_civ_score_free();
  }
}

/*************************************************************************
  Create the selected number of AI's.
*************************************************************************/
static void aifill_action(const struct setting *pset)
{
  aifill(*pset->integer.pvalue);
}

/*************************************************************************
  Restrict to the selected nation set.
*************************************************************************/
static void nationset_action(const struct setting *pset)
{
  /* If any player's existing selection is invalid, abort it */
  players_iterate(pplayer) {
    if (pplayer->nation != NULL) {
      if (!nation_is_in_current_set(pplayer->nation)) {
        (void) player_set_nation(pplayer, NO_NATION_SELECTED);
        send_player_info_c(pplayer, game.est_connections);
      }
    }
  } players_iterate_end;
  count_playable_nations();
  aifill(game.info.aifill);

  /* There might now be too many players for the available nations.
   * Rather than getting rid of some players arbitrarily, we let the
   * situation persist for all already-connected players; the server
   * will simply refuse to start until someone reduces the number of
   * players. This policy also avoids annoyance if nationset is
   * accidentally and transiently set to an unintended value.
   * (However, new connections will start out detached.) */
  if (normal_player_count() > server.playable_nations) {
    notify_conn(NULL, NULL, E_SETTING, ftc_server, "%s",
                _("Warning: not enough nations for all current players."));
  }

  send_nation_availability(game.est_connections);
}

/*************************************************************************
  Clear any user-set player colors in modes other than PLRCOL_PLR_SET.
*************************************************************************/
static void plrcol_action(const struct setting *pset)
{
  if (!game_was_started()) {
    if (read_enum_value(pset) != PLRCOL_PLR_SET) {
      players_iterate(pplayer) {
        server_player_set_color(pplayer, NULL);
      } players_iterate_end;
    }
    /* Update clients with new color scheme. */
    send_player_info_c(NULL, NULL);
  }
}

/*************************************************************************
  Toggle player AI status.
*************************************************************************/
static void autotoggle_action(const struct setting *pset)
{
  if (*pset->boolean.pvalue) {
    players_iterate(pplayer) {
      if (!pplayer->ai_controlled && !pplayer->is_connected) {
        toggle_ai_player_direct(NULL, pplayer);
        send_player_info_c(pplayer, game.est_connections);
      }
    } players_iterate_end;
  }
}

/*************************************************************************
  Enact a change in the 'timeout' server setting immediately, if the game
  is afoot.
*************************************************************************/
static void timeout_action(const struct setting *pset)
{
  if (S_S_RUNNING == server_state()) {
    int timeout = *pset->integer.pvalue;
    /* This may cause the current turn to end immediately. */
    game.info.seconds_to_phasedone = timeout;
    send_game_info(NULL);
  }
}

/*************************************************************************
  Validation callback functions.
*************************************************************************/

/****************************************************************************
  Verify the selected savename definition.
****************************************************************************/
static bool savename_validate(const char *value, struct connection *caller,
                              char *reject_msg, size_t reject_msg_len)
{
  char buf[MAX_LEN_PATH];

  generate_save_name(value, buf, sizeof(buf), NULL);

  if (!is_safe_filename(buf)) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Invalid save name definition: '%s' "
                        "(resolves to '%s')."), value, buf);
    return FALSE;
  }

  return TRUE;
}

/****************************************************************************
  Verify the value of the generator option (notably the MAPGEN_SCENARIO
  case).
****************************************************************************/
static bool generator_validate(int value, struct connection *caller,
                               char *reject_msg, size_t reject_msg_len)
{
  if (map_is_empty()) {
    if (MAPGEN_SCENARIO == value
        && (NULL != caller || !game.scenario.is_scenario)) {
      settings_snprintf(reject_msg, reject_msg_len,
                        _("You cannot disable the map generator."));
      return FALSE;
    }
    return TRUE;
  } else {
    if (MAPGEN_SCENARIO != value) {
      settings_snprintf(reject_msg, reject_msg_len,
                        _("You cannot require a map generator "
                          "when a map is loaded."));
      return FALSE;
    }
  }
  return TRUE;
}

/****************************************************************************
  Verify the name for the score log file.
****************************************************************************/
static bool scorefile_validate(const char *value, struct connection *caller,
                               char *reject_msg, size_t reject_msg_len)
{
  if (!is_safe_filename(value)) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Invalid score name definition: '%s'."), value);
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  Verify that a given demography string is valid. See
  game.demography.
*************************************************************************/
static bool demography_callback(const char *value,
                                struct connection *caller,
                                char *reject_msg,
                                size_t reject_msg_len)
{
  int error;

  if (is_valid_demography(value, &error)) {
    return TRUE;
  } else {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Demography string validation failed at character: "
                        "'%c'. Try \"help demography\"."), value[error]);
    return FALSE;
  }
}

/*************************************************************************
  Verify that a given allowtake string is valid.  See
  game.allow_take.
*************************************************************************/
static bool allowtake_callback(const char *value,
                               struct connection *caller,
                               char *reject_msg,
                               size_t reject_msg_len)
{
  int len = strlen(value), i;
  bool havecharacter_state = FALSE;

  /* We check each character individually to see if it's valid.  This
   * does not check for duplicate entries.
   *
   * We also track the state of the machine.  havecharacter_state is
   * true if the preceeding character was a primary label, e.g.
   * NHhAadb.  It is false if the preceeding character was a modifier
   * or if this is the first character. */

  for (i = 0; i < len; i++) {
    /* Check to see if the character is a primary label. */
    if (strchr("HhAadbOo", value[i])) {
      havecharacter_state = TRUE;
      continue;
    }

    /* If we've already passed a primary label, check to see if the
     * character is a modifier. */
    if (havecharacter_state && strchr("1234", value[i])) {
      havecharacter_state = FALSE;
      continue;
    }

    /* Looks like the character was invalid. */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Allowed take string validation failed at "
                        "character: '%c'. Try \"help allowtake\"."),
                      value[i]);
    return FALSE;
  }

  /* All characters were valid. */
  return TRUE;
}

/*************************************************************************
  Verify that a given startunits string is valid.  See
  game.server.start_units.
*************************************************************************/
static bool startunits_callback(const char *value,
                                struct connection *caller,
                                char *reject_msg,
                                size_t reject_msg_len)
{
  int len = strlen(value), i;

  /* We check each character individually to see if it's valid, and
   * also make sure there is at least one city founder. */

  for (i = 0; i < len; i++) {
    /* TODO: add 'f' back in here when we can support ferry units */
    if (strchr("cwxksdDaA", value[i])) {
      continue;
    }

    /* Looks like the character was invalid. */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Starting units string validation failed at "
                        "character '%c'. Try \"help startunits\"."),
                      value[i]);
    return FALSE;
  }

  /* All characters were valid. */
  return TRUE;
}

/*************************************************************************
  Verify that a given endturn is valid.
*************************************************************************/
static bool endturn_callback(int value, struct connection *caller,
                             char *reject_msg, size_t reject_msg_len)
{
  if (value < game.info.turn) {
    /* Tried to set endturn earlier than current turn */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Cannot set endturn earlier than current turn."));
    return FALSE;
  }
  return TRUE;
}

/*************************************************************************
  Verify that a given maxplayers string is valid.
*************************************************************************/
static bool maxplayers_callback(int value, struct connection *caller,
                                char *reject_msg, size_t reject_msg_len)
{
#ifdef GGZ_SERVER
  if (with_ggz) {
    /* In GGZ mode the maxplayers is the number of actual players - set
     * when the game is lauched and not changed thereafter.  This may be
     * changed in future. */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Cannot change maxplayers in GGZ mode."));
    return FALSE;
  }
#endif /* GGZ_SERVER */
  if (value < player_count()) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Number of players (%d) is higher than requested "
                        "value (%d). Keeping old value."), player_count(),
                      value);
    return FALSE;
  }
  /* If any start positions are defined by a scenario, we can only
   * accommodate as many players as we have start positions. */
  if (0 < map_startpos_count() && value > map_startpos_count()) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Requested value (%d) is greater than number of "
                        "available start positions (%d). Keeping old value."),
                      value, map_startpos_count());
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  Validate the 'nationset' server setting.
*************************************************************************/
static bool nationset_callback(const char *value,
                               struct connection *caller,
                               char *reject_msg,
                               size_t reject_msg_len)
{
  if (strlen(value) == 0) {
    return TRUE;
  } else if (nation_set_by_rule_name(value)) {
    return TRUE;
  } else {
    settings_snprintf(reject_msg, reject_msg_len,
                      /* TRANS: do not translate 'list nationsets' */
                      _("Unknown nation set \"%s\". See '%slist nationsets' "
                        "for possible values."), value, caller ? "/" : "");
    return FALSE;
  }
}

/*************************************************************************
  Validate the 'timeout' server setting.
*************************************************************************/
static bool timeout_callback(int value, struct connection *caller,
                             char *reject_msg, size_t reject_msg_len)
{
  /* Disallow low timeout values for non-hack connections. */
  if (caller && caller->access_level < ALLOW_HACK && value < 30) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("You are not allowed to set timeout values less "
                        "than 30 seconds."));
    return FALSE;
  }

  if (value == -1 && game.server.unitwaittime != 0) {
    /* autogame only with 'unitwaittime' = 0 */
    settings_snprintf(reject_msg, reject_msg_len,
                      /* TRANS: Do not translate setting names in ''. */
                      _("For autogames ('timeout' = -1) 'unitwaittime' "
                        "should be deactivated (= 0)."));
    return FALSE;
  }

  if (value > 0 && value < game.server.unitwaittime * 3 / 2) {
    /* for normal games 'timeout' should be at least 3/2 times the value
     * of 'unitwaittime' */
    settings_snprintf(reject_msg, reject_msg_len,
                      /* TRANS: Do not translate setting names in ''. */
                      _("'timeout' can not be lower than 3/2 of the "
                        "'unitwaittime' setting (= %d). Please change "
                        "'unitwaittime' first."), game.server.unitwaittime);
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  Check 'timeout' setting if 'unitwaittime' is changed.
*************************************************************************/
static bool unitwaittime_callback(int value, struct connection *caller,
                                  char *reject_msg, size_t reject_msg_len)
{
  if (game.info.timeout == -1 && value != 0) {
    settings_snprintf(reject_msg, reject_msg_len,
                      /* TRANS: Do not translate setting names in ''. */
                      _("For autogames ('timeout' = -1) 'unitwaittime' "
                        "should be deactivated (= 0)."));
    return FALSE;
  }

  if (game.info.timeout > 0 && value > game.info.timeout * 2 / 3) {
    settings_snprintf(reject_msg, reject_msg_len,
                      /* TRANS: Do not translate setting names in ''. */
                      _("'unitwaittime' has to be lower than 2/3 of the "
                        "'timeout' setting (= %d). Please change 'timeout' "
                        "first."), game.info.timeout);
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  Topology setting validation callback.
*************************************************************************/
static bool mapsize_callback(int value, struct connection *caller,
                             char *reject_msg, size_t reject_msg_len)
{
  if (value == MAPSIZE_XYSIZE && MAP_IS_ISOMETRIC &&
      map.ysize % 2 != 0) {
    /* An isometric map needs a even ysize. Is is calculated automatically
     * for all settings but mapsize=XYSIZE. */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("For an isometric or hexagonal map the ysize must be "
                        "even."));
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  xsize setting validation callback.
*************************************************************************/
static bool xsize_callback(int value, struct connection *caller,
                           char *reject_msg, size_t reject_msg_len)
{
  int size = value * map.ysize;

  if (size < MAP_MIN_SIZE * 1000) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("The map size (%d * %d = %d) must be larger than "
                        "%d tiles."), value, map.ysize, size,
                        MAP_MIN_SIZE * 1000);
    return FALSE;
  } else if (size > MAP_MAX_SIZE * 1000) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("The map size (%d * %d = %d) must be lower than "
                        "%d tiles."), value, map.ysize, size,
                        MAP_MAX_SIZE * 1000);
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  ysize setting validation callback.
*************************************************************************/
static bool ysize_callback(int value, struct connection *caller,
                           char *reject_msg, size_t reject_msg_len)
{
  int size = map.xsize * value;

  if (size < MAP_MIN_SIZE * 1000) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("The map size (%d * %d = %d) must be larger than "
                        "%d tiles."), map.xsize, value, size,
                        MAP_MIN_SIZE * 1000);
    return FALSE;
  } else if (size > MAP_MAX_SIZE * 1000) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("The map size (%d * %d = %d) must be lower than "
                        "%d tiles."), map.xsize, value, size,
                        MAP_MAX_SIZE * 1000);
    return FALSE;
  } else if (map.server.mapsize == MAPSIZE_XYSIZE && MAP_IS_ISOMETRIC &&
             value % 2 != 0) {
    /* An isometric map needs a even ysize. Is is calculated automatically
     * for all settings but mapsize=XYSIZE. */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("For an isometric or hexagonal map the ysize must be "
                        "even."));
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  Topology setting validation callback.
*************************************************************************/
static bool topology_callback(unsigned value, struct connection *caller,
                              char *reject_msg, size_t reject_msg_len)
{
  if (map.server.mapsize == MAPSIZE_XYSIZE &&
      ((value & (TF_ISO)) != 0 || (value & (TF_HEX)) != 0) &&
      map.ysize % 2 != 0) {
    /* An isometric map needs a even ysize. Is is calculated automatically
     * for all settings but mapsize=XYSIZE. */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("For an isometric or hexagonal map the ysize must be "
                        "even."));
    return FALSE;
  }

  return TRUE;
}

/*************************************************************************
  Validate that the player color mode can be used.
*************************************************************************/
static bool plrcol_validate(int value, struct connection *caller,
                            char *reject_msg, size_t reject_msg_len)
{
  enum plrcolor_mode mode = value;
  if (mode == PLRCOL_NATION_ORDER) {
    nations_iterate(pnation) {
      if (nation_color(pnation)) {
        /* At least one nation has a color. Allow this mode. */
        return TRUE;
      }
    } nations_iterate_end;
    settings_snprintf(reject_msg, reject_msg_len,
                      _("No nations in the currently loaded ruleset have "
                        "associated colors."));
    return FALSE;
  }
  return TRUE;
}

#define GEN_BOOL(name, value, sclass, scateg, slevel, to_client,            \
                 short_help, extra_help, func_validate, func_action,        \
                 _default)                                                  \
  {name, sclass, to_client, short_help, extra_help, SSET_BOOL,              \
      scateg, slevel,                                                       \
      {.boolean = {&value, _default, func_validate, bool_name,              \
                   FALSE}}, func_action, FALSE},

#define GEN_INT(name, value, sclass, scateg, slevel, to_client,         \
                short_help, extra_help, func_validate, func_action,     \
                _min, _max, _default)                                   \
  {name, sclass, to_client, short_help, extra_help, SSET_INT,           \
      scateg, slevel,                                                   \
      {.integer = {(int *) &value, _default, _min, _max, func_validate, \
                   0}},                                                 \
      func_action, FALSE},

#define GEN_STRING(name, value, sclass, scateg, slevel, to_client,      \
                   short_help, extra_help, func_validate, func_action,  \
                   _default)                                            \
  {name, sclass, to_client, short_help, extra_help, SSET_STRING,        \
      scateg, slevel,                                                   \
      {.string = {value, _default, sizeof(value), func_validate, ""}},  \
      func_action, FALSE},

#define GEN_ENUM(name, value, sclass, scateg, slevel, to_client,            \
                 short_help, extra_help, func_validate, func_action,        \
                 func_name, _default)                                       \
  { name, sclass, to_client, short_help, extra_help, SSET_ENUM,             \
      scateg, slevel,                                                       \
      { .enumerator = {  &value, sizeof(value), _default,                   \
                         func_validate,                                     \
       (val_name_func_t) func_name, 0 }}, func_action, FALSE},

#define GEN_BITWISE(name, value, sclass, scateg, slevel, to_client,         \
                   short_help, extra_help, func_validate, func_action,      \
                   func_name, _default)                                     \
  { name, sclass, to_client, short_help, extra_help, SSET_BITWISE,          \
    scateg, slevel,                                                         \
     { .bitwise = { (unsigned *) (void *) &value, _default, func_validate,  \
       func_name, 0 }}, func_action, FALSE},

/* game settings */
static struct setting settings[] = {

  /* These should be grouped by sclass */

  /* Map size parameters: adjustable if we don't yet have a map */
  GEN_ENUM("mapsize", map.server.mapsize, SSET_MAP_SIZE,
          SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Map size definition"),
          /* TRANS: The strings between double quotes are also translated
           * separately (they must match!). The strings between single
           * quotes are setting names and shouldn't be translated. The
           * strings between parentheses and in uppercase must stay as
           * untranslated. */
          N_("Chooses the method used to define the map size. Other options "
             "specify the parameters for each method.\n"
             "- \"Number of tiles\" (FULLSIZE): Map area (option 'size').\n"
             "- \"Tiles per player\" (PLAYER): Number of (land) tiles per "
             "player (option 'tilesperplayer').\n"
             "- \"Width and height\" (XYSIZE): Map width and height in "
             "tiles (options 'xsize' and 'ysize')."),
          mapsize_callback, NULL, mapsize_name, MAP_DEFAULT_MAPSIZE)

  GEN_INT("size", map.server.size, SSET_MAP_SIZE,
          SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Map area (in thousands of tiles)"),
          /* TRANS: The strings between double quotes are also translated
           * separately (they must match!). The strings between single
           * quotes are setting names and shouldn't be translated. The
           * strings between parentheses and in uppercase must stay as
           * untranslated. */
          N_("This value is used to determine the map area.\n"
             "  size = 4 is a normal map of 4,000 tiles (default)\n"
             "  size = 20 is a huge map of 20,000 tiles\n"
             "For this option to take effect, the \"Map size definition\" "
             "option ('mapsize') must be set to \"Number of tiles\" "
             "(FULLSIZE)."), NULL, NULL,
          MAP_MIN_SIZE, MAP_MAX_SIZE, MAP_DEFAULT_SIZE)

  GEN_INT("tilesperplayer", map.server.tilesperplayer, SSET_MAP_SIZE,
          SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Number of (land) tiles per player"),
          /* TRANS: The strings between double quotes are also translated
           * separately (they must match!). The strings between single
           * quotes are setting names and shouldn't be translated. The
           * strings between parentheses and in uppercase must stay as
           * untranslated. */
          N_("This value is used to determine the map dimensions. It "
             "calculates the map size at game start based on the number "
             "of players and the value of the setting 'landmass'.\n"
             "For this option to take effect, the \"Map size definition\" "
             "option ('mapsize') must be set to \"Tiles per player\" "
             "(PLAYER)."),
          NULL, NULL, MAP_MIN_TILESPERPLAYER,
          MAP_MAX_TILESPERPLAYER, MAP_DEFAULT_TILESPERPLAYER)

  GEN_INT("xsize", map.xsize, SSET_MAP_SIZE,
          SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Map width in tiles"),
          /* TRANS: The strings between double quotes are also translated
           * separately (they must match!). The strings between single
           * quotes are setting names and shouldn't be translated. The
           * strings between parentheses and in uppercase must stay as
           * untranslated. */
          N_("Defines the map width.\n"
             "For this option to take effect, the \"Map size definition\" "
             "option ('mapsize') must be set to \"Width and height\" "
             "(XYSIZE)."),
          xsize_callback, NULL,
          MAP_MIN_LINEAR_SIZE, MAP_MAX_LINEAR_SIZE, MAP_DEFAULT_LINEAR_SIZE)
  GEN_INT("ysize", map.ysize, SSET_MAP_SIZE,
          SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Map height in tiles"),
          /* TRANS: The strings between double quotes are also translated
           * separately (they must match!). The strings between single
           * quotes are setting names and shouldn't be translated. The
           * strings between parentheses and in uppercase must stay as
           * untranslated. */
          N_("Defines the map height.\n"
             "For this option to take effect, the \"Map size definition\" "
             "option ('mapsize') must be set to \"Width and height\" "
             "(XYSIZE)."),
          ysize_callback, NULL,
          MAP_MIN_LINEAR_SIZE, MAP_MAX_LINEAR_SIZE, MAP_DEFAULT_LINEAR_SIZE)

  GEN_BITWISE("topology", map.topology_id, SSET_MAP_SIZE,
              SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
              N_("Map topology index"),
              /* TRANS: do not edit the ugly ASCII art */
              N_("Freeciv maps are always two-dimensional. They may wrap at "
                 "the north-south and east-west directions to form a flat "
                 "map, a cylinder, or a torus (donut). Individual tiles may "
                 "be rectangular or hexagonal, with either a classic or "
                 "isometric alignment - this should be set based on the "
                 "tileset being used.\n"
                 "Classic rectangular:       Isometric rectangular:\n"
                 "      _________               /\\/\\/\\/\\/\\\n"
                 "     |_|_|_|_|_|             /\\/\\/\\/\\/\\/\n"
                 "     |_|_|_|_|_|             \\/\\/\\/\\/\\/\\\n"
                 "     |_|_|_|_|_|             /\\/\\/\\/\\/\\/\n"
                 "                             \\/\\/\\/\\/\\/\n"
                 "Hex tiles:                 Iso-hex:\n"
                 "  /\\/\\/\\/\\/\\/\\               _   _   _   _   _\n"
                 "  | | | | | | |             / \\_/ \\_/ \\_/ \\_/ \\\n"
                 "  \\/\\/\\/\\/\\/\\/\\"
                 "             \\_/ \\_/ \\_/ \\_/ \\_/\n"
                 "   | | | | | | |            / \\_/ \\_/ \\_/ \\_/ \\\n"
                 "   \\/\\/\\/\\/\\/\\/"
                 "             \\_/ \\_/ \\_/ \\_/ \\_/\n"),
              topology_callback, NULL, topology_name, MAP_DEFAULT_TOPO)

  GEN_ENUM("generator", map.server.generator,
           SSET_MAP_GEN, SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
           N_("Method used to generate map"),
           /* TRANS: The strings between double quotes are also translated
            * separately (they must match!). The strings between single
            * quotes (except 'fair') are setting names and shouldn't be
            * translated. The strings between parentheses and in uppercase
            * must stay as untranslated. */
           N_("Specifies the algorithm used to generate the map. If the "
              "default value of the 'startpos' option is used, then the "
              "chosen generator chooses an appropriate 'startpos' setting; "
              "otherwise, the generated map tries to accommodate the "
              "chosen 'startpos' setting.\n"
              "- \"Scenario map\" (SCENARIO): indicates a pre-generated map. "
              "By default, if the scenario does not specify start positions, "
              "they will be allocated depending on the size of continents.\n"
              "- \"Fully random height\" (RANDOM): generates maps with a "
              "number of equally spaced, relatively small islands. By default, "
              "start positions are allocated depending on continent size.\n"
              "- \"Pseudo-fractal height\" (FRACTAL): generates Earthlike "
              "worlds with one or more large continents and a scattering of "
              "smaller islands. By default, players are all placed on a "
              "single continent.\n"
              "- \"Island-based\" (ISLAND): generates 'fair' maps with a "
              "number of similarly-sized and -shaped islands, each with "
              "approximately the same ratios of terrain types. By default, "
              "each player gets their own island.\n"
              "If the requested generator is incompatible with other server "
              "settings, the server may fall back to another generator."),
           generator_validate, NULL, generator_name, MAP_DEFAULT_GENERATOR)

  GEN_ENUM("startpos", map.server.startpos,
           SSET_MAP_GEN, SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
           N_("Method used to choose start positions"),
           /* TRANS: The strings between double quotes are also translated
            * separately (they must match!). The strings between single
            * quotes (except 'best') are setting names and shouldn't be
            * translated. The strings between parentheses and in uppercase
            * must stay as untranslated. */
           N_("The method used to choose where each player's initial units "
              "start on the map. (For scenarios which include pre-set "
              "start positions, this setting is ignored.)\n"
              "- \"Generator's choice\" (DEFAULT): the start position "
              "placement will depend on the map generator chosen. See the "
              "'generator' setting.\n"
              "- \"One player per continent\" (SINGLE): one player is "
              "placed on each of a set of continents of approximately "
              "equivalent value (if possible).\n"
              "- \"Two or three players per continent\" (2or3): similar "
              "to SINGLE except that two players will be placed on each "
              "continent, with three on the 'best' continent if there is an "
              "odd number of players.\n"
              "- \"All players on a single continent\" (ALL): all players "
              "will start on the 'best' available continent.\n"
              "- \"Depending on size of continents\" (VARIABLE): players "
              "will be placed on the 'best' available continents such that, "
              "as far as possible, the number of players on each continent "
              "is proportional to its value.\n"
              "If the server cannot satisfy the requested setting due to "
              "there being too many players for continents, it may fall "
              "back to one of the others. (However, map generators try to "
              "create the right number of continents for the choice of this "
              "'startpos' setting and the number of players, so this is "
              "unlikely to occur.)"),
           NULL, NULL, startpos_name, MAP_DEFAULT_STARTPOS)

  GEN_BOOL("tinyisles", map.server.tinyisles,
           SSET_MAP_GEN, SSET_GEOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("Presence of 1x1 islands"),
           N_("This setting controls whether the map generator is allowed "
              "to make islands of one only tile size."), NULL, NULL,
           MAP_DEFAULT_TINYISLES)

  GEN_BOOL("separatepoles", map.server.separatepoles,
           SSET_MAP_GEN, SSET_GEOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Whether the poles are separate continents"),
           N_("If this setting is disabled, the continents may attach to "
              "poles."), NULL, NULL, MAP_DEFAULT_SEPARATE_POLES)

  GEN_BOOL("alltemperate", map.server.alltemperate, 
           SSET_MAP_GEN, SSET_GEOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("All the map is temperate"),
           N_("If this setting is enabled, the temperature will be "
              "equivalent everywhere on the map. As a result, the "
              "poles won't be generated."),
           NULL, NULL, MAP_DEFAULT_ALLTEMPERATE)

  GEN_INT("temperature", map.server.temperature,
          SSET_MAP_GEN, SSET_GEOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Average temperature of the planet"),
          N_("Small values will give a cold map, while larger values will "
             "give a hotter map.\n"
             "\n"
             "100 means a very dry and hot planet with no polar arctic "
             "zones, only tropical and dry zones.\n"
             " 70 means a hot planet with little polar ice.\n"
             " 50 means a temperate planet with normal polar, cold, "
             "temperate, and tropical zones; a desert zone overlaps "
             "tropical and temperate zones.\n"
             " 30 means a cold planet with small tropical zones.\n"
             "  0 means a very cold planet with large polar zones and no "
             "tropics."),
          NULL, NULL,
          MAP_MIN_TEMPERATURE, MAP_MAX_TEMPERATURE, MAP_DEFAULT_TEMPERATURE)
 
  GEN_INT("landmass", map.server.landpercent,
          SSET_MAP_GEN, SSET_GEOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Percentage of the map that is land"),
          N_("This setting gives the approximate percentage of the map "
             "that will be made into land."), NULL, NULL,
          MAP_MIN_LANDMASS, MAP_MAX_LANDMASS, MAP_DEFAULT_LANDMASS)

  GEN_INT("steepness", map.server.steepness,
          SSET_MAP_GEN, SSET_GEOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Amount of hills/mountains"),
          N_("Small values give flat maps, while higher values give a "
             "steeper map with more hills and mountains."), NULL, NULL,
          MAP_MIN_STEEPNESS, MAP_MAX_STEEPNESS, MAP_DEFAULT_STEEPNESS)

  GEN_INT("wetness", map.server.wetness,
          SSET_MAP_GEN, SSET_GEOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Amount of water on landmasses"), 
          N_("Small values mean lots of dry, desert-like land; "
             "higher values give a wetter map with more swamps, "
             "jungles, and rivers."), NULL, NULL,
          MAP_MIN_WETNESS, MAP_MAX_WETNESS, MAP_DEFAULT_WETNESS)

  GEN_BOOL("globalwarming", game.info.global_warming,
           SSET_RULES, SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
           N_("Global warming"),
           N_("If turned off, global warming will not occur "
              "as a result of pollution. This setting does not "
              "affect pollution."), NULL, NULL,
           GAME_DEFAULT_GLOBAL_WARMING)

  GEN_BOOL("nuclearwinter", game.info.nuclear_winter,
           SSET_RULES, SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
           N_("Nuclear winter"),
           N_("If turned off, nuclear winter will not occur "
              "as a result of nuclear war."), NULL, NULL,
           GAME_DEFAULT_NUCLEAR_WINTER)

  GEN_INT("mapseed", map.server.seed,
          SSET_MAP_GEN, SSET_INTERNAL, SSET_RARE, SSET_SERVER_ONLY,
          N_("Map generation random seed"),
          N_("The same seed will always produce the same map; "
             "for zero (the default) a seed will be chosen based on "
             "the time to give a random map. This setting is usually "
             "only of interest while debugging the game."), NULL, NULL,
          MAP_MIN_SEED, MAP_MAX_SEED, MAP_DEFAULT_SEED)

  /* Map additional stuff: huts and specials.  gameseed also goes here
   * because huts and specials are the first time the gameseed gets used (?)
   * These are done when the game starts, so these are historical and
   * fixed after the game has started.
   */
  GEN_INT("gameseed", game.server.seed,
          SSET_MAP_ADD, SSET_INTERNAL, SSET_RARE, SSET_SERVER_ONLY,
          N_("Game random seed"),
          N_("For zero (the default) a seed will be chosen based "
             "on the current time. This setting is usually "
             "only of interest while debugging the game."), NULL, NULL,
          GAME_MIN_SEED, GAME_MAX_SEED, GAME_DEFAULT_SEED)

  GEN_INT("specials", map.server.riches,
          SSET_MAP_ADD, SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Amount of \"special\" resource tiles"),
          N_("Special resources improve the basic terrain type they "
             "are on. The server variable's scale is parts per "
             "thousand."), NULL, NULL,
          MAP_MIN_RICHES, MAP_MAX_RICHES, MAP_DEFAULT_RICHES)

  GEN_INT("huts", map.server.huts,
          SSET_MAP_ADD, SSET_GEOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Amount of huts (minor tribe villages)"),
          N_("This setting gives the exact number of huts that will be "
             "placed on the entire map. Huts are small tribal villages "
             "that may be investigated by units."), NULL, NULL,
          MAP_MIN_HUTS, MAP_MAX_HUTS, MAP_DEFAULT_HUTS)

  /* Options affecting numbers of players and AI players.  These only
   * affect the start of the game and can not be adjusted after that.
   */
  GEN_INT("minplayers", game.server.min_players,
          SSET_PLAYERS, SSET_INTERNAL, SSET_VITAL,
          SSET_TO_CLIENT,
          N_("Minimum number of players"),
          N_("There must be at least this many players (connected "
             "human players) before the game can start."),
          NULL, NULL,
          GAME_MIN_MIN_PLAYERS, GAME_MAX_MIN_PLAYERS, GAME_DEFAULT_MIN_PLAYERS)

  GEN_INT("maxplayers", game.server.max_players,
          SSET_PLAYERS, SSET_INTERNAL, SSET_VITAL, SSET_TO_CLIENT,
          N_("Maximum number of players"),
          N_("The maximal number of human and AI players who can be in "
             "the game. When this number of players are connected in "
             "the pregame state, any new players who try to connect "
             "will be rejected.\n"
             "When playing a scenario which defines player start positions, "
             "this setting cannot be set to greater than the number of "
             "defined start positions."),
          maxplayers_callback, NULL,
          GAME_MIN_MAX_PLAYERS, GAME_MAX_MAX_PLAYERS, GAME_DEFAULT_MAX_PLAYERS)

  GEN_INT("aifill", game.info.aifill,
          SSET_PLAYERS, SSET_INTERNAL, SSET_VITAL, SSET_TO_CLIENT,
          N_("Limited number of AI players"),
          N_("If set to a positive value, then AI players will be "
             "automatically created or removed to keep the total "
             "number of players at this amount. As more players join, "
             "these AI players will be replaced. When set to zero, "
             "all AI players will be removed."), NULL,
          aifill_action, GAME_MIN_AIFILL, GAME_MAX_AIFILL,
          GAME_DEFAULT_AIFILL)

  GEN_STRING("nationset", game.server.nationset,
             SSET_PLAYERS, SSET_INTERNAL, SSET_RARE, SSET_TO_CLIENT,
             N_("Set of nations to choose from"),
             /* TRANS: do not translate '/list nationsets' */
             N_("Controls the set of nations allowed in the game. The "
                "choices are defined by the ruleset.\n"
                "Only nations in the set selected here will be allowed in "
                "any circumstances, including new players and civil war; "
                "small sets may thus limit the number of players in a game.\n"
                "If this is left blank, the ruleset's default nation set is "
                "used.\n"
                "See '/list nationsets' for possible choices for the "
                "currently loaded ruleset."),
             nationset_callback, nationset_action, GAME_DEFAULT_NATIONSET)

  GEN_INT("ec_turns", game.server.event_cache.turns,
          SSET_RULES_FLEXIBLE, SSET_INTERNAL, SSET_SITUATIONAL,
          SSET_TO_CLIENT,
          N_("Event cache for this number of turns"),
          N_("Event messages are saved for this number of turns. A value of "
             "0 deactivates the event cache."),
          NULL, NULL, GAME_MIN_EVENT_CACHE_TURNS, GAME_MAX_EVENT_CACHE_TURNS,
          GAME_DEFAULT_EVENT_CACHE_TURNS)

  GEN_INT("ec_max_size", game.server.event_cache.max_size,
          SSET_RULES_FLEXIBLE, SSET_INTERNAL, SSET_SITUATIONAL,
          SSET_TO_CLIENT,
          N_("Size of the event cache"),
          N_("This defines the maximal number of events in the event cache."),
          NULL, NULL, GAME_MIN_EVENT_CACHE_MAX_SIZE,
          GAME_MAX_EVENT_CACHE_MAX_SIZE, GAME_DEFAULT_EVENT_CACHE_MAX_SIZE)

  GEN_BOOL("ec_chat", game.server.event_cache.chat,
           SSET_RULES_FLEXIBLE, SSET_INTERNAL, SSET_SITUATIONAL,
           SSET_TO_CLIENT,
           N_("Save chat messages in the event cache"),
           N_("If turned on, chat messages will be saved in the event "
              "cache."), NULL, NULL, GAME_DEFAULT_EVENT_CACHE_CHAT)

  GEN_BOOL("ec_info", game.server.event_cache.info,
           SSET_RULES_FLEXIBLE, SSET_INTERNAL, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Print turn and time for each cached event"),
           /* TRANS: Don't translate the text between single quotes. */
           N_("If turned on, all cached events will be marked by the turn "
              "and time of the event like '(T2 - 15:29:52)'."),
           NULL, NULL, GAME_DEFAULT_EVENT_CACHE_INFO)

  /* Game initialization parameters (only affect the first start of the game,
   * and not reloads).  Can not be changed after first start of game.
   */
  /* TODO: Add this line back when we can support Ferry units */
  /* "    f   = Ferryboat (eg., Trireme)\n" */
  GEN_STRING("startunits", game.server.start_units,
             SSET_GAME_INIT, SSET_SOCIOLOGY, SSET_VITAL, SSET_TO_CLIENT,
             N_("List of players' initial units"),
             N_("This should be a string of characters, each of which "
                "specifies a unit role. There must be at least one city "
                "founder in the string. The characters and their "
                "meanings are:\n"
                "    c   = City founder (eg., Settlers)\n"
                "    w   = Terrain worker (eg., Engineers)\n"
                "    x   = Explorer (eg., Explorer)\n"
                "    k   = Gameloss (eg., King)\n"
                "    s   = Diplomat (eg., Diplomat)\n"
                "    d   = Ok defense unit (eg., Warriors)\n"
                "    D   = Good defense unit (eg., Phalanx)\n"
                "    a   = Fast attack unit (eg., Horsemen)\n"
                "    A   = Strong attack unit (eg., Catapult)\n"),
             startunits_callback, NULL, GAME_DEFAULT_START_UNITS)

  GEN_BOOL("startcity", game.server.start_city,
           SSET_GAME_INIT, SSET_SOCIOLOGY, SSET_VITAL, SSET_TO_CLIENT,
           N_("Whether player starts with a city"),
           N_("If this is set, game will start with player's first "
              "city already founded to starting location."),
           NULL, NULL, GAME_DEFAULT_START_CITY)         

  GEN_INT("dispersion", game.server.dispersion,
          SSET_GAME_INIT, SSET_SOCIOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Area where initial units are located"),
          N_("This is the radius within "
             "which the initial units are dispersed."), NULL, NULL,
          GAME_MIN_DISPERSION, GAME_MAX_DISPERSION, GAME_DEFAULT_DISPERSION)

  GEN_INT("gold", game.info.gold,
          SSET_GAME_INIT, SSET_ECONOMICS, SSET_VITAL, SSET_TO_CLIENT,
          N_("Starting gold per player"), 
          N_("At the beginning of the game, each player is given this "
             "much gold."), NULL, NULL,
          GAME_MIN_GOLD, GAME_MAX_GOLD, GAME_DEFAULT_GOLD)

  GEN_INT("techlevel", game.info.tech,
          SSET_GAME_INIT, SSET_SCIENCE, SSET_VITAL, SSET_TO_CLIENT,
          N_("Number of initial techs per player"), 
          /* TRANS: The string between single quotes is a setting name and
           * should not be translated. */
          N_("At the beginning of the game, each player is given this "
             "many technologies. The technologies chosen are random for "
             "each player. Depending on the value of tech_cost_style in "
             "the ruleset, a big value for 'techlevel' can make the next "
             "techs really expensive."), NULL, NULL,
          GAME_MIN_TECHLEVEL, GAME_MAX_TECHLEVEL, GAME_DEFAULT_TECHLEVEL)

  GEN_INT("sciencebox", game.info.sciencebox,
          SSET_RULES, SSET_SCIENCE, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Technology cost multiplier percentage"),
          N_("This affects how quickly players can research new "
             "technology. All tech costs are multiplied by this amount "
             "(as a percentage). The base tech costs are determined by "
             "the ruleset or other game settings."),
          NULL, NULL, GAME_MIN_SCIENCEBOX, GAME_MAX_SCIENCEBOX,
          GAME_DEFAULT_SCIENCEBOX)

  GEN_INT("techpenalty", game.server.techpenalty,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Percentage penalty when changing tech"),
          N_("If you change your current research technology, and you have "
             "positive research points, you lose this percentage of those "
             "research points. This does not apply when you have just gained "
             "a technology this turn."), NULL, NULL,
          GAME_MIN_TECHPENALTY, GAME_MAX_TECHPENALTY,
          GAME_DEFAULT_TECHPENALTY)

  GEN_INT("techlost_recv", game.server.techlost_recv,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Chance to lose an invention while receiving it"),
          N_("If you receive an invention via a treaty, this setting "
             "defines the chance that the invention is lost during the "
             "transfer."),
          NULL, NULL, GAME_MIN_TECHLOST_RECV, GAME_MAX_TECHLOST_RECV,
          GAME_DEFAULT_TECHLOST_RECV)

  GEN_INT("techlost_donor", game.server.techlost_donor,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Chance to lose an invention while giving it"),
          N_("If you give an invention via a treaty, this setting "
             "defines the chance that the invention is lost for your "
             "civilization during the transfer."),
          NULL, NULL, GAME_MIN_TECHLOST_DONOR, GAME_MAX_TECHLOST_DONOR,
          GAME_DEFAULT_TECHLOST_DONOR)

  GEN_BOOL("team_pooled_research", game.info.team_pooled_research,
           SSET_RULES, SSET_SCIENCE, SSET_VITAL, SSET_TO_CLIENT,
           N_("Team pooled research"),
           N_("If this setting is turned on, then the team mates will share "
              "the science research. Else, every player of the team will "
              "have to make its own."),
           NULL, NULL, GAME_DEFAULT_TEAM_POOLED_RESEARCH)

  GEN_INT("diplcost", game.server.diplcost,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Penalty when getting tech or gold from treaty"),
          N_("For each technology you gain from a diplomatic treaty, you "
             "lose research points equal to this percentage of the cost to "
             "research a new technology. If this is non-zero, you can end up "
             "with negative research points. Also applies to gold "
             "transfers in diplomatic treaties."),
          NULL, NULL,
          GAME_MIN_DIPLCOST, GAME_MAX_DIPLCOST, GAME_DEFAULT_DIPLCOST)

  GEN_INT("conquercost", game.server.conquercost,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Penalty when getting tech from conquering"),
          N_("For each technology you gain by conquering an enemy city, you "
             "lose research points equal to this percentage of the cost to "
             "research a new technology. If this is non-zero, you can end up "
             "with negative research points."),
          NULL, NULL,
          GAME_MIN_CONQUERCOST, GAME_MAX_CONQUERCOST,
          GAME_DEFAULT_CONQUERCOST)

  GEN_INT("freecost", game.server.freecost,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Penalty when getting a free tech"),
          /* TRANS: The strings between single quotes are setting names and
           * shouldn't be translated. */
          N_("For each technology you gain \"for free\" (other than "
             "covered by 'diplcost' or 'conquercost': for instance, from huts "
             "or from Great Library effects), you lose research points "
             "equal to this percentage of the cost to research a new "
             "technology. If this is non-zero, you can end up "
             "with negative research points."),
          NULL, NULL,
          GAME_MIN_FREECOST, GAME_MAX_FREECOST, GAME_DEFAULT_FREECOST)

  GEN_INT("techlossforgiveness", game.server.techloss_forgiveness,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Research point debt threshold for losing tech"),
          N_("When you have negative research points, and your shortfall is "
             "greater than this percentage of the cost of your current "
             "research, you forget a technology you already knew.\n"
             "The special value -1 prevents loss of technology regardless of "
             "research points."),
          NULL, NULL,
          GAME_MIN_TECHLOSSFG, GAME_MAX_TECHLOSSFG,
          GAME_DEFAULT_TECHLOSSFG)

 GEN_INT("techlossrestore", game.server.techloss_restore,
          SSET_RULES, SSET_SCIENCE, SSET_RARE, SSET_TO_CLIENT,
          N_("Research points restored after losing a tech"),
          N_("When you lose a technology due to a negative research balance "
             "(see 'techlossforgiveness'), this percentage of its research "
             "cost is credited to your research balance (this may not be "
             "sufficient to make it positive).\n"
             "The special value -1 means that your research balance is always "
             "restored to zero, regardless of your previous shortfall."),
          NULL, NULL,
          GAME_MIN_TECHLOSSREST, GAME_MAX_TECHLOSSREST,
          GAME_DEFAULT_TECHLOSSREST)

  GEN_INT("foodbox", game.info.foodbox,
          SSET_RULES, SSET_ECONOMICS, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Food required for a city to grow"),
          N_("This is the base amount of food required to grow a city. "
             "This value is multiplied by another factor that comes from "
             "the ruleset and is dependent on the size of the city."),
          NULL, NULL,
          GAME_MIN_FOODBOX, GAME_MAX_FOODBOX, GAME_DEFAULT_FOODBOX)

  GEN_INT("aqueductloss", game.server.aqueductloss,
          SSET_RULES, SSET_ECONOMICS, SSET_RARE, SSET_TO_CLIENT,
          N_("Percentage food lost when building needed"),
          N_("If a city would expand, but it can't because it needs "
             "an Aqueduct (or Sewer System), it loses this percentage "
             "of its foodbox (or half that amount when it has a "
             "Granary)."), NULL, NULL,
          GAME_MIN_AQUEDUCTLOSS, GAME_MAX_AQUEDUCTLOSS, 
          GAME_DEFAULT_AQUEDUCTLOSS)

  GEN_INT("shieldbox", game.info.shieldbox,
          SSET_RULES, SSET_ECONOMICS, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Multiplier percentage for production costs"),
          N_("This affects how quickly units and buildings can be "
             "produced.  The base costs are multiplied by this value (as "
             "a percentage)."),
          NULL, NULL, GAME_MIN_SHIELDBOX, GAME_MAX_SHIELDBOX,
          GAME_DEFAULT_SHIELDBOX)

  /* Notradesize and fulltradesize used to have callbacks to prevent them
   * from being set illegally (notradesize > fulltradesize).  However this
   * provided a problem when setting them both through the client's settings
   * dialog, since they cannot both be set atomically.  So the callbacks were
   * removed and instead the game now knows how to deal with invalid
   * settings. */
  GEN_INT("fulltradesize", game.info.fulltradesize,
          SSET_RULES, SSET_ECONOMICS, SSET_RARE, SSET_TO_CLIENT,
          N_("Minimum city size to get full trade"),
          /* TRANS: The strings between single quotes are setting names and
           * shouldn't be translated. */
          N_("There is a trade penalty in all cities smaller than this. "
             "The penalty is 100% (no trade at all) for sizes up to "
             "'notradesize', and decreases gradually to 0% (no penalty "
             "except the normal corruption) for size='fulltradesize'. "
             "See also 'notradesize'."), NULL, NULL,
          GAME_MIN_FULLTRADESIZE, GAME_MAX_FULLTRADESIZE, 
          GAME_DEFAULT_FULLTRADESIZE)

  GEN_INT("notradesize", game.info.notradesize,
          SSET_RULES, SSET_ECONOMICS, SSET_RARE, SSET_TO_CLIENT,
          N_("Maximum size of a city without trade"),
          /* TRANS: The strings between single quotes are setting names and
           * shouldn't be translated. */
          N_("Cities do not produce any trade at all unless their size "
             "is larger than this amount. The produced trade increases "
             "gradually for cities larger than 'notradesize' and smaller "
             "than 'fulltradesize'. See also 'fulltradesize'."), NULL, NULL,
          GAME_MIN_NOTRADESIZE, GAME_MAX_NOTRADESIZE,
          GAME_DEFAULT_NOTRADESIZE)

  GEN_INT("citymindist", game.info.citymindist,
          SSET_RULES, SSET_SOCIOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Minimum distance between cities"),
          N_("When a player attempts to found a new city, it is prevented "
             "if the distance from any existing city is less than this "
             "setting. For example, when this setting is 3, there must be "
             "at least two clear tiles in any direction between all existing "
             "cities and the new city site. A value of 1 removes any such "
             "restriction on city placement."),
          NULL, NULL,
          GAME_MIN_CITYMINDIST, GAME_MAX_CITYMINDIST,
          GAME_DEFAULT_CITYMINDIST)

  GEN_BOOL("trading_tech", game.info.trading_tech,
           SSET_RULES, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("Technology trading"),
           N_("If turned off, trading technologies in the diplomacy dialog "
              "is not allowed."), NULL, NULL,
           GAME_DEFAULT_TRADING_TECH)

  GEN_BOOL("trading_gold", game.info.trading_gold,
           SSET_RULES, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("Gold trading"),
           N_("If turned off, trading gold in the diplomacy dialog "
              "is not allowed."), NULL, NULL,
           GAME_DEFAULT_TRADING_GOLD)

  GEN_BOOL("trading_city", game.info.trading_city,
           SSET_RULES, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("City trading"),
           N_("If turned off, trading cities in the diplomacy dialog "
              "is not allowed."), NULL, NULL,
           GAME_DEFAULT_TRADING_CITY)

  GEN_INT("trademindist", game.info.trademindist,
          SSET_RULES, SSET_ECONOMICS, SSET_RARE, SSET_TO_CLIENT,
          N_("Minimum distance for trade routes"),
          N_("In order for two cities in the same civilization to establish "
             "a trade route, they must be at least this far apart on the "
             "map. For square grids, the distance is calculated as "
             "\"Manhattan distance\", that is, the sum of the displacements "
             "along the x and y directions."), NULL, NULL,
          GAME_MIN_TRADEMINDIST, GAME_MAX_TRADEMINDIST,
          GAME_DEFAULT_TRADEMINDIST)

  GEN_INT("rapturedelay", game.info.rapturedelay,
          SSET_RULES, SSET_SOCIOLOGY, SSET_SITUATIONAL, SSET_TO_CLIENT,
          N_("Number of turns between rapture effect"),
          N_("Sets the number of turns between rapture growth of a city. "
             "If set to n a city will grow after celebrating for n+1 "
             "turns."),
          NULL, NULL,
          GAME_MIN_RAPTUREDELAY, GAME_MAX_RAPTUREDELAY,
          GAME_DEFAULT_RAPTUREDELAY)

  GEN_INT("disasters", game.info.disasters,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Frequency of disasters"),
          N_("Sets frequency of disasters occurring to cities."),
          NULL, NULL,
          GAME_MIN_DISASTERS, GAME_MAX_DISASTERS,
          GAME_DEFAULT_DISASTERS)

  GEN_INT("razechance", game.server.razechance,
          SSET_RULES, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
          N_("Chance for conquered building destruction"),
          N_("When a player conquers a city, each city improvement has this "
             "percentage chance to be destroyed."), NULL, NULL,
          GAME_MIN_RAZECHANCE, GAME_MAX_RAZECHANCE, GAME_DEFAULT_RAZECHANCE)

  GEN_INT("occupychance", game.server.occupychance,
          SSET_RULES, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
          N_("Chance of moving into tile after attack"),
          N_("If set to 0, combat is Civ1/2-style (when you attack, "
             "you remain in place). If set to 100, attacking units "
             "will always move into the tile they attacked when they win "
             "the combat (and no enemy units remain in the tile). If "
             "set to a value between 0 and 100, this will be used as "
             "the percent chance of \"occupying\" territory."), NULL, NULL,
          GAME_MIN_OCCUPYCHANCE, GAME_MAX_OCCUPYCHANCE, 
          GAME_DEFAULT_OCCUPYCHANCE)

  GEN_BOOL("autoattack", game.server.autoattack, SSET_RULES_FLEXIBLE, SSET_MILITARY,
           SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Turn on/off server-side autoattack"),
           N_("If set to on, units with moves left will automatically "
              "consider attacking enemy units that move adjacent to them."),
           NULL, NULL, GAME_DEFAULT_AUTOATTACK)

  GEN_BOOL("killstack", game.info.killstack, SSET_RULES, SSET_MILITARY,
           SSET_RARE, SSET_TO_CLIENT,
           N_("Do all units in tile die with defender"),
           N_("If this is enabled, each time a defender unit loses in combat, "
              "and is not inside a city or suitable base, all units in the same "
              "tile are destroyed along with the defender. If this is disabled, "
              "only the defender unit is destroyed."),
           NULL, NULL, GAME_DEFAULT_KILLSTACK)

  GEN_BOOL("killcitizen", game.info.killcitizen,
           SSET_RULES, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
           N_("Reduce city population after attack"),
           N_("This flag indicates whether city population is reduced "
              "after successful attack of enemy unit. If this is disabled "
              "population is never reduced. Even when this is enabled "
              "only some units may kill citizens."),
           NULL, NULL, GAME_DEFAULT_KILLCITIZEN)

  GEN_INT("killunhomed", game.server.killunhomed,
          SSET_RULES, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
          N_("Slowly kill units without home cities (e.g., starting units)"),
          N_("If greater than 0, then every unit without a homecity will "
             "lose hitpoints each turn. The number of hitpoints lost is "
             "given by 'killunhomed' percent of the hitpoints of the unit "
             "type. At least one hitpoint is lost every turn until the "
             "death of the unit."),
          NULL, NULL, GAME_MIN_KILLUNHOMED, GAME_MAX_KILLUNHOMED,
          GAME_DEFAULT_KILLUNHOMED)

  GEN_ENUM("borders", game.info.borders,
           SSET_RULES, SSET_MILITARY, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("National borders"),
           N_("If this is not disabled, then any land tiles around a "
              "fortress or city will be owned by that nation."),
           NULL, NULL, borders_name, GAME_DEFAULT_BORDERS)

  GEN_BOOL("happyborders", game.info.happyborders,
           SSET_RULES, SSET_MILITARY, SSET_SITUATIONAL,
           SSET_TO_CLIENT,
           N_("Units inside borders cause no unhappiness"),
           N_("If this is set, units will not cause unhappiness when "
              "inside your own borders."), NULL, NULL,
           GAME_DEFAULT_HAPPYBORDERS)

  GEN_ENUM("diplomacy", game.info.diplomacy,
           SSET_RULES, SSET_MILITARY, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Ability to do diplomacy with other players"),
           N_("This setting controls the ability to do diplomacy with "
              "other players."),
           NULL, NULL, diplomacy_name, GAME_DEFAULT_DIPLOMACY)

  GEN_ENUM("citynames", game.server.allowed_city_names,
           SSET_RULES, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("Allowed city names"),
           /* TRANS: The strings between double quotes are also translated
            * separately (they must match!). The strings between parentheses
            * and in uppercase must not be translated. */
           N_("- \"No restrictions\" (NO_RESTRICTIONS): players can have "
              "multiple cities with the same names.\n"
              "- \"Unique to a player\" (PLAYER_UNIQUE): one player can't "
              "have multiple cities with the same name.\n"
              "- \"Globally unique\" (GLOBAL_UNIQUE): all cities in a game "
              "have to have different names.\n"
              "- \"No city name stealing\" (NO_STEALING): like "
              "\"Globally unique\", but a player isn't allowed to use a "
              "default city name of another nation unless it is a default "
              "for their nation also."),
           NULL, NULL, citynames_name, GAME_DEFAULT_ALLOWED_CITY_NAMES)

  GEN_ENUM("plrcolormode", game.server.plrcolormode,
           SSET_RULES, SSET_INTERNAL, SSET_RARE, SSET_TO_CLIENT,
           N_("How to pick player colors"),
           /* TRANS: The strings between double quotes are also translated
            * separately (they must match!). The strings between single quotes
            * are setting names and shouldn't be translated. The strings
            * between parentheses and in uppercase must not be translated. */
           N_("This setting determines how player colors are chosen. Player "
              "colors are used in the Nations report, for national borders on "
              "the map, and so on.\n"
              "- \"Per-player, in order\" (PLR_ORDER): colors are assigned to "
              "individual players in order from a list defined by the "
              "ruleset.\n"
              "- \"Per-player, random\" (PLR_RANDOM): colors are assigned "
              "to invididual players randomly from the set defined by the "
              "ruleset.\n"
              "- \"Set manually\" (PLR_SET): colors can be set with the "
              "'playercolor' command before the game starts; these are not "
              "restricted to the ruleset colors. Any players for which no "
              "color is set when the game starts get a random color from the "
              "ruleset.\n"
              "- \"Per-team, in order\" (TEAM_ORDER): colors are assigned to "
              "teams from the list in the ruleset. Every player on the same "
              "team gets the same color.\n"
              "- \"Per-nation, in order\" (NATION_ORDER): if the ruleset "
              "defines a color for a player's nation, the player takes that "
              "color. Any players whose nations don't have associated colors "
              "get a random color from the list in the ruleset.\n"
              "Regardless of this setting, individual player colors can be "
              "changed after the game starts with the 'playercolor' command."),
           plrcol_validate, plrcol_action, plrcol_name,
           GAME_DEFAULT_PLRCOLORMODE)

  /* Flexible rules: these can be changed after the game has started.
   *
   * The distinction between "rules" and "flexible rules" is not always
   * clearcut, and some existing cases may be largely historical or
   * accidental.  However some generalizations can be made:
   *
   *   -- Low-level game mechanics should not be flexible (eg, rulesets).
   *   -- Options which would affect the game "state" (city production etc)
   *      should not be flexible (eg, foodbox).
   *   -- Options which are explicitly sent to the client (eg, in
   *      packet_game_info) should probably not be flexible, or at
   *      least need extra care to be flexible.
   */
  GEN_ENUM("barbarians", game.server.barbarianrate,
           SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_VITAL, SSET_TO_CLIENT,
           N_("Barbarian appearance frequency"),
           /* TRANS: The string between single quotes is a setting name and
            * should not be translated. */
           N_("This setting controls how frequently the barbarians appear "
              "in the game. See also the 'onsetbarbs' setting."),
           NULL, NULL, barbarians_name, GAME_DEFAULT_BARBARIANRATE)

  GEN_INT("onsetbarbs", game.server.onsetbarbarian,
          SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Barbarian onset turn"),
          N_("Barbarians will not appear before this turn."), NULL, NULL,
          GAME_MIN_ONSETBARBARIAN, GAME_MAX_ONSETBARBARIAN, 
          GAME_DEFAULT_ONSETBARBARIAN)

  GEN_INT("revolen", game.server.revolution_length,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
          N_("Length in turns of revolution"),
          N_("When changing governments, a period of anarchy lasting this "
             "many turns will occur. "
             "Setting this value to 0 will give a random "
             "length of 1-5 turns."), NULL, NULL,
          GAME_MIN_REVOLUTION_LENGTH, GAME_MAX_REVOLUTION_LENGTH, 
          GAME_DEFAULT_REVOLUTION_LENGTH)

  GEN_BOOL("fogofwar", game.info.fogofwar,
           SSET_RULES, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
           N_("Whether to enable fog of war"),
           N_("If this is enabled, only those units and cities within "
              "the vision range of your own units and cities will be "
              "revealed to you. You will not see new cities or terrain "
              "changes in tiles not observed."),
           NULL, NULL, GAME_DEFAULT_FOGOFWAR)

  GEN_BOOL("foggedborders", game.server.foggedborders,
           SSET_RULES, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
           N_("Whether fog of war applies to border changes"),
           N_("If this setting is enabled, players will not be able "
              "to see changes in tile ownership if they do not have "
              "direct sight of the affected tiles. Otherwise, players "
              "can see any or all changes to borders as long as they "
              "have previously seen the tiles."),
           NULL, NULL, GAME_DEFAULT_FOGGEDBORDERS)

  GEN_BITWISE("airliftingstyle", game.info.airlifting_style,
              SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_SITUATIONAL,
              SSET_TO_CLIENT, N_("Airlifting style"),
              /* TRANS: The strings between double quotes are also
               * translated separately (they must match!). The strings
               * between parenthesis and in uppercase must not be
               * translated. */
              N_("This setting affects airlifting units between cities. It "
                 "can be a set of the following values:\n"
                 "- \"Allows units to be airlifted from allied cities\" "
                 "(FROM_ALLIES).\n"
                 "- \"Allows units to be airlifted to allied cities\" "
                 "(TO_ALLIES).\n"
                 "- \"Unlimited units from source city\" (SRC_UNLIMITED): "
                 "note that airlifting from a city doesn't reduce the "
                 "airlifted counter, but still needs at least 1.\n"
                 "- \"Unlimited units to destination city\" "
                 "(DEST_UNLIMITED): note that airlifting to a city doesn't "
                 "reduce the airlifted counter, and doesn't need any."),
              NULL, NULL, airliftingstyle_name, GAME_DEFAULT_AIRLIFTINGSTYLE)

  GEN_INT("diplchance", game.server.diplchance,
          SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_SITUATIONAL,
          SSET_TO_CLIENT,
          N_("Base chance for diplomats and spies to succeed"),
          N_("The base chance of a spy returning from a successful mission and "
             "the base chance of success for diplomats and spies."),
          NULL, NULL,
          GAME_MIN_DIPLCHANCE, GAME_MAX_DIPLCHANCE, GAME_DEFAULT_DIPLCHANCE)

  GEN_BOOL("spacerace", game.info.spacerace,
           SSET_RULES_FLEXIBLE, SSET_SCIENCE, SSET_VITAL, SSET_TO_CLIENT,
           N_("Whether to allow space race"),
           N_("If this option is enabled, players can build spaceships."),
           NULL, NULL, GAME_DEFAULT_SPACERACE)

  GEN_BOOL("endspaceship", game.server.endspaceship, SSET_RULES_FLEXIBLE,
           SSET_SCIENCE, SSET_VITAL, SSET_TO_CLIENT,
           N_("Should the game end if the spaceship arrives?"),
           N_("If this option is turned on, the game will end with the "
              "arrival of a spaceship at Alpha Centauri."),
           NULL, NULL, GAME_DEFAULT_END_SPACESHIP)

  GEN_INT("civilwarsize", game.server.civilwarsize,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
          N_("Minimum number of cities for civil war"),
          N_("A civil war is triggered when a player has at least this "
             "many cities and the player's capital is captured. If "
             "this option is set to the maximum value, civil wars are "
             "turned off altogether."), NULL, NULL,
          GAME_MIN_CIVILWARSIZE, GAME_MAX_CIVILWARSIZE, 
          GAME_DEFAULT_CIVILWARSIZE)

  GEN_BOOL("restrictinfra", game.info.restrictinfra,
           SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
           N_("Restrict the use of the infrastructure for enemy units"),
           N_("If this option is enabled, the use of roads and rails "
              "will be restricted for enemy units."), NULL, NULL,
           GAME_DEFAULT_RESTRICTINFRA)

  GEN_BOOL("unreachableprotects", game.info.unreachable_protects,
           SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
           N_("Does unreachable unit protect reachable ones"),
           N_("This option controls whether tiles with both unreachable "
              "and reachable units can be attacked. If disabled, any "
              "tile with reachable units can be attacked. If enabled, "
              "tiles with an unreachable unit in them cannot be attacked."),
           NULL, NULL, GAME_DEFAULT_UNRPROTECTS)

  GEN_INT("contactturns", game.server.contactturns,
          SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
          N_("Turns until player contact is lost"),
          N_("Players may meet for diplomacy this number of turns "
             "after their units have last met, even when they do not have "
             "an embassy. If set to zero, then players cannot meet unless "
             "they have an embassy."),
          NULL, NULL,
          GAME_MIN_CONTACTTURNS, GAME_MAX_CONTACTTURNS, 
          GAME_DEFAULT_CONTACTTURNS)

  GEN_BOOL("savepalace", game.server.savepalace,
           SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
           N_("Rebuild palace whenever capital is conquered"),
           N_("If this is turned on, when the capital is conquered the "
              "palace is automatically rebuilt for free in another randomly "
              "chosen city. This is significant because the technology "
              "requirement for building a palace will be ignored. (In "
              "some rulesets, buildings other than the palace are affected "
              "by this setting.)"),
           NULL, NULL, GAME_DEFAULT_SAVEPALACE)

  GEN_BOOL("homecaughtunits", game.server.homecaughtunits,
           SSET_RULES_FLEXIBLE, SSET_MILITARY, SSET_RARE, SSET_TO_CLIENT,
           N_("Give caught units a homecity"),
           /* TRANS: The string between single quotes is a setting name and
            * should not be translated. */
           N_("If unset, caught units will have no homecity and will be "
              "subject to the 'killunhomed' option."),
           NULL, NULL, GAME_DEFAULT_HOMECAUGHTUNITS)

  GEN_BOOL("alliedvictory", game.server.allied_victory,
           SSET_RULES_FLEXIBLE, SSET_MILITARY,
           SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Whether allied players can win together"),
           N_("If this option is turned on and a point is reached where "
              "all the players still able to win the game are allies, and "
              "at least one defeated player is not part of this alliance, "
              "then the game will end in an immediate shared victory for "
              "the allied players."),
           NULL, NULL, GAME_DEFAULT_ALLIED_VICTORY)

  GEN_BOOL("naturalcitynames", game.server.natural_city_names,
           SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("Whether to use natural city names"),
           N_("If enabled, the default city names will be determined based "
              "on the surrounding terrain."),
           NULL, NULL, GAME_DEFAULT_NATURALCITYNAMES)

  GEN_BOOL("migration", game.server.migration,
           SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("Whether to enable citizen migration"),
           /* TRANS: The strings between single quotes are setting names
            * and should not be translated. */
           N_("This is the master setting that controls whether citizen "
              "migration is active in the game. If enabled, citizens may "
              "automatically move from less desirable cities to more "
              "desirable ones. The \"desirability\" of a given city is "
              "calculated from a number of factors. In general larger "
              "cities with more income and improvements will be preferred. "
              "Citizens will never migrate out of the capital, or cause "
              "a wonder to be lost by disbanding a city. A number of other "
              "settings control how migration behaves:\n"
              "  'mgr_turninterval' - How often citizens try to migrate.\n"
              "  'mgr_foodneeded'   - Whether destination food is checked.\n"
              "  'mgr_distance'     - How far citizens will migrate.\n"
              "  'mgr_worldchance'  - Chance for inter-nation migration.\n"
              "  'mgr_nationchance' - Chance for intra-nation migration."),
           NULL, NULL, GAME_DEFAULT_MIGRATION)

  GEN_INT("mgr_turninterval", game.server.mgr_turninterval,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
          N_("Number of turns between migrations from a city"),
           /* TRANS: Do not translate 'migration' setting name. */
          N_("This setting controls the number of turns between migration "
             "checks for a given city. The interval is calculated from "
             "the founding turn of the city. So for example if this "
             "setting is 5, citizens will look for a suitable migration "
             "destination every five turns from the founding of their "
             "current city. Migration will never occur the same turn "
             "that a city is built. This setting has no effect unless "
             "migration is enabled by the 'migration' setting."), NULL,
          NULL, GAME_MIN_MGR_TURNINTERVAL, GAME_MAX_MGR_TURNINTERVAL,
          GAME_DEFAULT_MGR_TURNINTERVAL)

  GEN_BOOL("mgr_foodneeded", game.server.mgr_foodneeded,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
           N_("Whether migration is limited by food"),
           /* TRANS: Do not translate 'migration' setting name. */
           N_("If this setting is enabled, citizens will not migrate to "
              "cities which would not have enough food to support them. "
              "This setting has no effect unless migration is enabled by "
              "the 'migration' setting."), NULL, NULL,
           GAME_DEFAULT_MGR_FOODNEEDED)

  GEN_INT("mgr_distance", game.server.mgr_distance,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
          N_("Maximum distance citizens may migrate"),
          /* TRANS: Do not translate 'migration' setting name. */
          N_("This setting controls how far citizens may look for a "
             "suitable migration destination when deciding which city "
             "to migrate to. The value is added to the current city radius "
             "and compared to the distance between the two cities. If "
             "the distance is lower or equal, migration is possible. This "
             "setting has no effect unless migration is activated by the "
             "'migration' setting."),
          NULL, NULL, GAME_MIN_MGR_DISTANCE, GAME_MAX_MGR_DISTANCE,
          GAME_DEFAULT_MGR_DISTANCE)

  GEN_INT("mgr_nationchance", game.server.mgr_nationchance,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
          N_("Percent probability for migration within the same nation"),
          /* TRANS: Do not translate 'migration' setting name. */
          N_("This setting controls how likely it is for citizens to "
             "migrate between cities owned by the same player. Zero "
             "indicates migration will never occur, 100 means that "
             "migration will always occur if the citizens find a suitable "
             "destination. This setting has no effect unless migration "
             "is activated by the 'migration' setting."), NULL, NULL,
          GAME_MIN_MGR_NATIONCHANCE, GAME_MAX_MGR_NATIONCHANCE,
          GAME_DEFAULT_MGR_NATIONCHANCE)

  GEN_INT("mgr_worldchance", game.server.mgr_worldchance,
          SSET_RULES_FLEXIBLE, SSET_SOCIOLOGY, SSET_RARE, SSET_TO_CLIENT,
          N_("Percent probability for migration between foreign cities"),
          /* TRANS: Do not translate 'migration' setting name. */
          N_("This setting controls how likely it is for migration "
             "to occur between cities owned by different players. "
             "Zero indicates migration will never occur, 100 means "
             "that citizens will always migrate if they find a suitable "
             "destination. This setting has no effect if migration is "
             "not enabled by the 'migration' setting."), NULL, NULL,
          GAME_MIN_MGR_WORLDCHANCE, GAME_MAX_MGR_WORLDCHANCE,
          GAME_DEFAULT_MGR_WORLDCHANCE)

  /* Meta options: these don't affect the internal rules of the game, but
   * do affect players.  Also options which only produce extra server
   * "output" and don't affect the actual game.
   * ("endturn" is here, and not RULES_FLEXIBLE, because it doesn't
   * affect what happens in the game, it just determines when the
   * players stop playing and look at the score.)
   */
  GEN_STRING("allowtake", game.server.allow_take,
             SSET_META, SSET_NETWORK, SSET_RARE, SSET_TO_CLIENT,
             N_("Players that users are allowed to take"),
             /* TRANS: the strings in double quotes are server command names
              * and should not be translated. */
             N_("This should be a string of characters, each of which "
                "specifies a type or status of a civilization (player).\n"
                "Clients will only be permitted to take or observe those "
                "players which match one of the specified letters. This "
                "only affects future uses of the \"take\" or \"observe\" "
                "commands; it is not retroactive. The characters and their "
                "meanings are:\n"
                "    o,O = Global observer\n"
                "    b   = Barbarian players\n"
                "    d   = Dead players\n"
                "    a,A = AI players\n"
                "    h,H = Human players\n"
                "The first description on this list which matches a "
                "player is the one which applies. Thus 'd' does not "
                "include dead barbarians, 'a' does not include dead AI "
                "players, and so on. Upper case letters apply before "
                "the game has started, lower case letters afterwards.\n"
                "Each character above may be followed by one of the "
                "following numbers to allow or restrict the manner "
                "of connection:\n"
                "(none) = Controller allowed, observers allowed, "
                "can displace connections. (Displacing a connection means "
                "that you may take over a player, even when another user "
                "already controls that player.)\n"
                "     1 = Controller allowed, observers allowed, "
                "can't displace connections;\n"
                "     2 = Controller allowed, no observers allowed, "
                "can displace connections;\n"
                "     3 = Controller allowed, no observers allowed, "
                "can't displace connections;\n"
                "     4 = No controller allowed, observers allowed"),
             allowtake_callback, NULL, GAME_DEFAULT_ALLOW_TAKE)

  GEN_BOOL("autotoggle", game.server.auto_ai_toggle,
           SSET_META, SSET_NETWORK, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Whether AI-status toggles with connection"),
           N_("If enabled, AI status is turned off when a player "
              "connects, and on when a player disconnects."),
           NULL, autotoggle_action, GAME_DEFAULT_AUTO_AI_TOGGLE)

  GEN_INT("endturn", game.server.end_turn,
          SSET_META, SSET_SOCIOLOGY, SSET_VITAL, SSET_TO_CLIENT,
          N_("Turn the game ends"),
          N_("The game will end at the end of the given turn."),
          endturn_callback, NULL,
          GAME_MIN_END_TURN, GAME_MAX_END_TURN, GAME_DEFAULT_END_TURN)

  GEN_BITWISE("revealmap", game.server.revealmap, SSET_GAME_INIT,
              SSET_MILITARY, SSET_SITUATIONAL, SSET_TO_CLIENT,
              N_("Reveal the map"),
              /* TRANS: The strings between double quotes are also translated
               * separately (they must match!). The strings between single
               * quotes are setting names and shouldn't be translated. The
               * strings between parentheses and in uppercase must not be
               * translated. */
              N_("If \"Reveal map at game start\" (START) is set, the "
                 "initial state of the entire map will be known to all "
                 "players from the start of the game, although it may "
                 "still be fogged (depending on the 'fogofwar' setting). "
                 "If \"Unfog map for dead players\" (DEAD) is set, dead "
                 "players can see the entire map, if they are alone in "
                 "their team."),
             NULL, NULL, revealmap_name, GAME_DEFAULT_REVEALMAP)

  GEN_INT("timeout", game.info.timeout,
          SSET_META, SSET_INTERNAL, SSET_VITAL, SSET_TO_CLIENT,
          N_("Maximum seconds per turn"),
          /* TRANS: \"Turn Done\" refers to the client button; it is also
           * translated separately, the translation should be the same.
           * \"timeoutincrease\" is a command name and must not to be
           * translated. */
          N_("If all players have not hit \"Turn Done\" before this "
             "time is up, then the turn ends automatically. Zero "
             "means there is no timeout. In servers compiled with "
             "debugging, a timeout of -1 sets the autogame test mode. "
             "Only connections with hack level access may set the "
             "timeout to lower than 30 seconds. Use this with the "
             "command \"timeoutincrease\" to have a dynamic timer. "
             "The first turn is treated as a special case and is controlled "
             "by the 'first_timeout' setting."),
          timeout_callback, timeout_action,
          GAME_MIN_TIMEOUT, GAME_MAX_TIMEOUT, GAME_DEFAULT_TIMEOUT)

  GEN_INT("first_timeout", game.server.first_timeout,
          SSET_META, SSET_INTERNAL, SSET_VITAL, SSET_TO_CLIENT,
          N_("First turn timeout"),
          /* TRANS: The strings between single quotes are setting names and
           * should not be translated. */
          N_("If greater than 0, T0 will last for 'first_timeout' seconds.\n"
             "If set to 0, T0 will not have a timeout.\n"
             "If set to -1, the special treatment of T0 will be disabled.\n"
             "See also 'timeout'."),
          NULL, NULL, GAME_MIN_FIRST_TIMEOUT, GAME_MAX_FIRST_TIMEOUT,
          GAME_DEFAULT_FIRST_TIMEOUT)

  GEN_INT("timeaddenemymove", game.server.timeoutaddenemymove,
          SSET_META, SSET_INTERNAL, SSET_VITAL, SSET_TO_CLIENT,
          N_("Timeout at least n seconds when enemy moved"),
          N_("Any time a unit moves while in sight of an enemy player, "
             "the remaining timeout is increased to this value."),
          NULL, NULL, 0, GAME_MAX_TIMEOUT, GAME_DEFAULT_TIMEOUTADDEMOVE)

  GEN_INT("unitwaittime", game.server.unitwaittime,
          SSET_RULES_FLEXIBLE, SSET_INTERNAL, SSET_VITAL, SSET_TO_CLIENT,
          N_("Time between unit moves over turn change"),
          /* TRANS: The string between single quotes is a setting name and
           * should not be translated. */
          N_("This setting gives the minimum amount of time in seconds "
             "between unit moves after a turn change occurs. For "
             "example, if this setting is set to 20 and a unit moves "
             "5 seconds before the turn change, it will not be able "
             "to move in the next turn for at least 15 seconds. Building "
             "cities is also affected by this setting, as well as units "
             "moving inside a transporter. This value is limited to "
             "a maximum value of 2/3 'timeout'."),
          unitwaittime_callback, NULL, GAME_MIN_UNITWAITTIME,
          GAME_MAX_UNITWAITTIME, GAME_DEFAULT_UNITWAITTIME)

  /* This setting points to the "stored" value; changing it won't have
   * an effect until the next synchronization point (i.e., the start of
   * the next turn). */
  GEN_ENUM("phasemode", game.server.phase_mode_stored,
           SSET_META, SSET_INTERNAL, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Control of simultaneous player/team phases"),
           N_("This setting controls whether players may make "
              "moves at the same time during a turn. Change "
              "in setting takes effect next turn."),
           NULL, NULL, phasemode_name, GAME_DEFAULT_PHASE_MODE)

  GEN_INT("nettimeout", game.server.tcptimeout,
          SSET_META, SSET_NETWORK, SSET_RARE, SSET_TO_CLIENT,
          N_("Seconds to let a client's network connection block"),
          N_("If a network connection is blocking for a time greater than "
             "this value, then the connection is closed. Zero "
             "means there is no timeout (although connections will be "
             "automatically disconnected eventually)."),
          NULL, NULL,
          GAME_MIN_TCPTIMEOUT, GAME_MAX_TCPTIMEOUT, GAME_DEFAULT_TCPTIMEOUT)

  GEN_INT("netwait", game.server.netwait,
          SSET_META, SSET_NETWORK, SSET_RARE, SSET_TO_CLIENT,
          N_("Max seconds for network buffers to drain"),
          N_("The server will wait for up to the value of this "
             "parameter in seconds, for all client connection network "
             "buffers to unblock. Zero means the server will not "
             "wait at all."), NULL, NULL,
          GAME_MIN_NETWAIT, GAME_MAX_NETWAIT, GAME_DEFAULT_NETWAIT)

  GEN_INT("pingtime", game.server.pingtime,
          SSET_META, SSET_NETWORK, SSET_RARE, SSET_TO_CLIENT,
          N_("Seconds between PINGs"),
          N_("The server will poll the clients with a PING request "
             "each time this period elapses."), NULL, NULL,
          GAME_MIN_PINGTIME, GAME_MAX_PINGTIME, GAME_DEFAULT_PINGTIME)

  GEN_INT("pingtimeout", game.server.pingtimeout,
          SSET_META, SSET_NETWORK, SSET_RARE,
          SSET_TO_CLIENT,
          N_("Time to cut a client"),
          N_("If a client doesn't reply to a PING in this time the "
             "client is disconnected."), NULL, NULL,
          GAME_MIN_PINGTIMEOUT, GAME_MAX_PINGTIMEOUT, GAME_DEFAULT_PINGTIMEOUT)

  GEN_BOOL("turnblock", game.server.turnblock,
           SSET_META, SSET_INTERNAL, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Turn-blocking game play mode"),
           N_("If this is turned on, the game turn is not advanced "
              "until all players have finished their turn, including "
              "disconnected players."),
           NULL, NULL, GAME_DEFAULT_TURNBLOCK)

  GEN_BOOL("fixedlength", game.server.fixedlength,
           SSET_META, SSET_INTERNAL, SSET_SITUATIONAL, SSET_TO_CLIENT,
           N_("Fixed-length turns play mode"),
           /* TRANS: \"Turn Done\" refers to the client button; it is also
            * translated separately, the translation should be the same. */
           N_("If this is turned on the game turn will not advance "
              "until the timeout has expired, even after all players "
              "have clicked on \"Turn Done\"."),
           NULL, NULL, FALSE)

  GEN_STRING("demography", game.server.demography,
             SSET_META, SSET_INTERNAL, SSET_SITUATIONAL, SSET_TO_CLIENT,
             N_("What is in the Demographics report"),
             /* TRANS: The strings between double quotes should be
              * translated. */
             N_("This should be a string of characters, each of which "
                "specifies the inclusion of a line of information "
                "in the Demographics report.\n"
                "The characters and their meanings are:\n"
                "    N = include Population\n"
                "    P = include Production\n"
                "    A = include Land Area\n"
                "    L = include Literacy\n"
                "    R = include Research Speed\n"
                "    S = include Settled Area\n"
                "    E = include Economics\n"
                "    M = include Military Service\n"
                "    O = include Pollution\n"
                "Additionally, the following characters control whether "
                "or not certain columns are displayed in the report:\n"
                "    q = display \"quantity\" column\n"
                "    r = display \"rank\" column\n"
                "    b = display \"best nation\" column\n"
                "The order of characters is not significant, but "
                "their capitalization is."),
             demography_callback, NULL, GAME_DEFAULT_DEMOGRAPHY)

  GEN_INT("saveturns", game.server.save_nturns,
          SSET_META, SSET_INTERNAL, SSET_VITAL, SSET_SERVER_ONLY,
          N_("Turns per auto-save"),
          /* TRANS: The string between double quotes is also translated
           * separately (it must match!). The string between single
           * quotes is a setting name and shouldn't be translated. */
          N_("How many turns elapse between automatic game saves. This "
             "setting only has an effect when the 'autosaves' setting "
             "includes \"New turn\"."), NULL, NULL,
          GAME_MIN_SAVETURNS, GAME_MAX_SAVETURNS, GAME_DEFAULT_SAVETURNS)

  GEN_BITWISE("autosaves", game.server.autosaves,
              SSET_META, SSET_INTERNAL, SSET_VITAL, SSET_SERVER_ONLY,
              N_("Which savegames are generated automatically"),
              /* TRANS: The strings between double quotes are also translated
               * separately (they must match!). The strings between single
               * quotes are setting names and shouldn't be translated. The
               * strings between parentheses and in uppercase must stay as
               * untranslated. */
              N_("This setting controls which autosave types get generated:\n"
                 "- \"New turn\" (TURN): Save when turn begins, once every "
                 "'saveturns' turns.\n"
                 "- \"Game over\" (GAMEOVER): Final save when game ends.\n"
                 "- \"No player connections\" (QUITIDLE): "
                 "Save before server restarts due to lack of players.\n"
                 "- \"Server interrupted\" (INTERRUPT): Save when server "
                 "quits due to interrupt."),
              NULL, NULL, autosaves_name, GAME_DEFAULT_AUTOSAVES)

  GEN_INT("compress", game.server.save_compress_level,
          SSET_META, SSET_INTERNAL, SSET_RARE, SSET_SERVER_ONLY,
          N_("Savegame compression level"),
          /* TRANS: 'compresstype' setting name should not be translated. */
          N_("If non-zero, saved games will be compressed depending on the "
             "'compresstype' setting. Larger values will give better "
             "compression but take longer."),
          NULL, NULL, GAME_MIN_COMPRESS_LEVEL, GAME_MAX_COMPRESS_LEVEL,
          GAME_DEFAULT_COMPRESS_LEVEL)

  GEN_ENUM("compresstype", game.server.save_compress_type,
           SSET_META, SSET_INTERNAL, SSET_RARE, SSET_SERVER_ONLY,
           N_("Savegame compression algorithm"),
           N_("Compression library to use for savegames."),
           NULL, NULL, compresstype_name, GAME_DEFAULT_COMPRESS_TYPE)

  GEN_STRING("savename", game.server.save_name,
             SSET_META, SSET_INTERNAL, SSET_VITAL, SSET_SERVER_ONLY,
             N_("Definition of the save file name"),
             /* TRANS: %R, %S, %T and %Y must not be translated. The
              * strings (examples and setting names) between single quotes
              * neither. The strings between <> should be translated.
              * xgettext:no-c-format */
             N_("Within the string the following custom formats are "
                "allowed:\n"
                "  %R = <reason>\n"
                "  %S = <suffix>\n"
                "  %T = <turn-number>\n"
                "  %Y = <game-year>\n"
                "\n"
                "Example: 'freeciv-T%04T-Y%+05Y-%R' => "
                "'freeciv-T0100-Y00001-manual'\n"
                "\n"
                "Be careful to use at least one of %T and %Y, else newer "
                "savegames will overwrite old ones. If none of the formats "
                "is used '-T%04T-Y%05Y-%R' is appended to the value of "
                "'savename'."),
             savename_validate, NULL, GAME_DEFAULT_SAVE_NAME)

  GEN_BOOL("scorelog", game.server.scorelog,
           SSET_META, SSET_INTERNAL, SSET_SITUATIONAL, SSET_SERVER_ONLY,
           N_("Whether to log player statistics"),
           /* TRANS: The string between single quotes is a setting name and
            * should not be translated. */
           N_("If this is turned on, player statistics are appended to "
              "the file defined by the option 'scorefile' every turn. "
              "These statistics can be used to create power graphs after "
              "the game."), NULL, scorelog_action, GAME_DEFAULT_SCORELOG)

  GEN_STRING("scorefile", game.server.scorefile,
             SSET_META, SSET_INTERNAL, SSET_SITUATIONAL, SSET_SERVER_ONLY,
             N_("Name for the score log file"),
             /* TRANS: Don't translate the string in single quotes. */
             N_("The default name for the score log file is "
              "'freeciv-score.log'."),
             scorefile_validate, NULL, GAME_DEFAULT_SCOREFILE)

  GEN_INT("maxconnectionsperhost", game.server.maxconnectionsperhost,
          SSET_RULES_FLEXIBLE, SSET_NETWORK, SSET_RARE, SSET_TO_CLIENT,
          N_("Maximum number of connections to the server per host"),
          N_("New connections from a given host will be rejected if "
             "the total number of connections from the very same host "
             "equals or exceeds this value. A value of 0 means that "
             "there is no limit, at least up to the maximum number of "
             "connections supported by the server."), NULL, NULL,
          GAME_MIN_MAXCONNECTIONSPERHOST, GAME_MAX_MAXCONNECTIONSPERHOST,
          GAME_DEFAULT_MAXCONNECTIONSPERHOST)

  GEN_INT("kicktime", game.server.kick_time,
          SSET_RULES_FLEXIBLE, SSET_NETWORK, SSET_RARE, SSET_SERVER_ONLY,
          N_("Time before a kicked user can reconnect"),
          /* TRANS: the string in double quotes is a server command name and
           * should not be translated */
          N_("Gives the time in seconds before a user kicked using the "
             "\"kick\" command may reconnect. Changing this setting will "
             "affect users kicked in the past."), NULL, NULL,
          GAME_MIN_KICK_TIME, GAME_MAX_KICK_TIME, GAME_DEFAULT_KICK_TIME)
};

#undef GEN_BOOL
#undef GEN_INT
#undef GEN_STRING
#undef GEN_ENUM
#undef GEN_BITWISE

/* The number of settings, not including the END. */
static const int SETTINGS_NUM = ARRAY_SIZE(settings);

/****************************************************************************
  Returns the setting to the given id.
****************************************************************************/
struct setting *setting_by_number(int id)
{
  return (0 <= id && id < SETTINGS_NUM ? settings + id : NULL);
}

/****************************************************************************
  Returns the setting to the given name.
****************************************************************************/
struct setting *setting_by_name(const char *name)
{
  fc_assert_ret_val(name, NULL);

  settings_iterate(SSET_ALL, pset) {
    if (0 == strcmp(name, pset->name)) {
      return pset;
    }
  } settings_iterate_end;
  return NULL;
}

/****************************************************************************
  Returns the id to the given setting.
****************************************************************************/
int setting_number(const struct setting *pset)
{
  fc_assert_ret_val(pset != NULL, -1);
  return pset - settings;
}

/****************************************************************************
  Access function for the setting name.
****************************************************************************/
const char *setting_name(const struct setting *pset)
{
  return pset->name;
}

/****************************************************************************
  Access function for the short help (not translated yet) of the setting.
****************************************************************************/
const char *setting_short_help(const struct setting *pset)
{
  return pset->short_help;
}

/****************************************************************************
  Access function for the long (extra) help (not translated yet) of
  the setting.
****************************************************************************/
const char *setting_extra_help(const struct setting *pset)
{
  return pset->extra_help;
}

/****************************************************************************
  Access function for the setting type.
****************************************************************************/
enum sset_type setting_type(const struct setting *pset)
{
  return pset->stype;
}

/****************************************************************************
  Access function for the setting level (used by the /show command).
****************************************************************************/
enum sset_level setting_level(const struct setting *pset)
{
  return pset->slevel;
}

/****************************************************************************
  Access function for the setting category.
****************************************************************************/
enum sset_category setting_category(const struct setting *pset)
{
  return pset->scategory;
}

/****************************************************************************
  Returns whether the specified server setting (option) can currently
  be changed by the caller. If it returns FALSE, the reason of the failure
  is available by the function setting_error().
****************************************************************************/
bool setting_is_changeable(const struct setting *pset,
                           struct connection *caller, char *reject_msg,
                           size_t reject_msg_len)
{
  if (caller
      && (caller->access_level < ALLOW_BASIC
          || (caller->access_level < ALLOW_HACK && !pset->to_client))) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("You are not allowed to change the setting '%s'."),
                      setting_name(pset));
    return FALSE;
  }

  if (setting_locked(pset)) {
    /* setting is locked by the ruleset */
    settings_snprintf(reject_msg, reject_msg_len,
                      _("The setting '%s' is locked by the ruleset."),
                      setting_name(pset));
    return FALSE;
  }

  switch (pset->sclass) {
  case SSET_MAP_SIZE:
  case SSET_MAP_GEN:
    /* Only change map options if we don't yet have a map: */
    if (map_is_empty()) {
      return TRUE;
    }

    settings_snprintf(reject_msg, reject_msg_len,
                      _("The setting '%s' can't be modified after the map "
                        "is fixed."), setting_name(pset));
    return FALSE;

  case SSET_MAP_ADD:
  case SSET_PLAYERS:
  case SSET_GAME_INIT:
  case SSET_RULES:
    /* Only change start params and most rules if we don't yet have a map,
     * or if we do have a map but its a scenario one (ie, the game has
     * never actually been started).
     */
    if (map_is_empty() || game.info.is_new_game) {
      return TRUE;
    }

    settings_snprintf(reject_msg, reject_msg_len,
                      _("The setting '%s' can't be modified after the game "
                        "has started."), setting_name(pset));
    return FALSE;

  case SSET_RULES_FLEXIBLE:
  case SSET_META:
    /* These can always be changed: */
    return TRUE;
  }

  log_error("Wrong class variant for setting %s (%d): %d.",
            setting_name(pset), setting_number(pset), pset->sclass);
  settings_snprintf(reject_msg, reject_msg_len, _("Internal error."));

  return FALSE;
}

/****************************************************************************
  Returns whether the specified server setting (option) can be seen by the
  caller.
****************************************************************************/
bool setting_is_visible(const struct setting *pset,
                        struct connection *caller)
{
  return (!caller
          || pset->to_client
          || caller->access_level >= ALLOW_HACK);
}

/****************************************************************************
  Convert the string prefix to an integer representation.
  NB: This function is used for SSET_ENUM *and* SSET_BITWISE.

  FIXME: this mostly duplicate match_prefix_full().
****************************************************************************/
static enum m_pre_result
setting_match_prefix_base(const val_name_func_t name_fn,
                          const char *prefix, int *ind_result,
                          const char **matches, size_t max_matches,
                          size_t *pnum_matches)
{
  const struct sset_val_name *name;
  size_t len = strlen(prefix);
  size_t num_matches;
  int i;

  *pnum_matches = 0;

  if (0 == len) {
    return M_PRE_EMPTY;
  }

  for (i = 0, num_matches = 0; (name = name_fn(i)); i++) {
    if (0 == fc_strncasecmp(name->support, prefix, len)) {
      if (strlen(name->support) == len) {
        *ind_result = i;
        return M_PRE_EXACT;
      }
      if (num_matches < max_matches) {
        matches[num_matches] = name->support;
        (*pnum_matches)++;
      }
      if (0 == num_matches++) {
        *ind_result = i;
      }
    }
  }

  if (1 == num_matches) {
    return M_PRE_ONLY;
  } else if (1 < num_matches) {
    return M_PRE_AMBIGUOUS;
  } else {
    return M_PRE_FAIL;
  }
}

/****************************************************************************
  Convert the string prefix to an integer representation.
  NB: This function is used for SSET_ENUM *and* SSET_BITWISE.
****************************************************************************/
static bool setting_match_prefix(const val_name_func_t name_fn,
                                 const char *prefix, int *pvalue,
                                 char *reject_msg,
                                 size_t reject_msg_len)
{
  const char *matches[16];
  size_t num_matches;

  switch (setting_match_prefix_base(name_fn, prefix, pvalue, matches,
                                    ARRAY_SIZE(matches), &num_matches)) {
  case M_PRE_EXACT:
  case M_PRE_ONLY:
    return TRUE;        /* Ok. */
  case M_PRE_AMBIGUOUS:
    {
      struct astring astr = ASTRING_INIT;

      fc_assert(2 <= num_matches);
      settings_snprintf(reject_msg, reject_msg_len,
                        _("\"%s\" prefix is ambiguous. Candidates are: %s."),
                        prefix,
                        astr_build_and_list(&astr, matches, num_matches));
      astr_free(&astr);
    }
    return FALSE;
  case M_PRE_EMPTY:
    settings_snprintf(reject_msg, reject_msg_len, _("Missing value."));
    return FALSE;
  case M_PRE_LONG:
  case M_PRE_FAIL:
  case M_PRE_LAST:
    break;
  }

  settings_snprintf(reject_msg, reject_msg_len,
                    _("No match for \"%s\"."), prefix);
  return FALSE;
}

/****************************************************************************
  Compute the string representation of the value for this boolean setting.
****************************************************************************/
static const char *setting_bool_to_str(const struct setting *pset,
                                       bool value, bool pretty,
                                       char *buf, size_t buf_len)
{
  const struct sset_val_name *name = pset->boolean.name(value);

  if (pretty) {
    fc_snprintf(buf, buf_len, "%s", Q_(name->pretty));
  } else {
    fc_strlcpy(buf, name->support, buf_len);
  }
  return buf;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available in the optionnal parameter
  'reject_msg'.

  FIXME: also check the access level of pconn.
****************************************************************************/
static bool setting_bool_validate_base(const struct setting *pset,
                                       const char *val, int *pint_val,
                                       struct connection *caller,
                                       char *reject_msg,
                                       size_t reject_msg_len)
{
  char buf[256];

  if (SSET_BOOL != pset->stype) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("This setting is not a boolean."));
    return FALSE;
  }

  sz_strlcpy(buf, val);
  remove_leading_trailing_spaces(buf);

  return (setting_match_prefix(pset->boolean.name, buf, pint_val,
                               reject_msg, reject_msg_len)
          && (NULL == pset->boolean.validate
              || pset->boolean.validate(0 != *pint_val, caller, reject_msg,
                                        reject_msg_len)));
}

/****************************************************************************
  Set the setting to 'val'. Returns TRUE on success. If it's not,
  the reason of the failure is available in the optionnal parameter
  'reject_msg'.
****************************************************************************/
bool setting_bool_set(struct setting *pset, const char *val,
                      struct connection *caller, char *reject_msg,
                      size_t reject_msg_len)
{
  int int_val;

  if (!setting_is_changeable(pset, caller, reject_msg, reject_msg_len)
      || !setting_bool_validate_base(pset, val, &int_val, caller,
                                     reject_msg, reject_msg_len)) {
    return FALSE;
  }

  *pset->boolean.pvalue = (0 != int_val);
  return TRUE;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available in the optionnal parameter
  'reject_msg'.
****************************************************************************/
bool setting_bool_validate(const struct setting *pset, const char *val,
                           struct connection *caller, char *reject_msg,
                           size_t reject_msg_len)
{
  int int_val;

  return setting_bool_validate_base(pset, val, &int_val, caller,
                                    reject_msg, reject_msg_len);
}

/****************************************************************************
  Convert the integer to the long support string representation of a boolean
  setting. This function must match the secfile_enum_name_data_fn_t type.
****************************************************************************/
static const char *setting_bool_secfile_str(secfile_data_t data, int val)
{
  const struct sset_val_name *name =
      ((const struct setting *) data)->boolean.name(val);

  return (NULL != name ? name->support : NULL);
}

/****************************************************************************
  Compute the string representation of the value for this integer setting.
****************************************************************************/
static const char *setting_int_to_str(const struct setting *pset,
                                      int value, bool pretty,
                                      char *buf, size_t buf_len)
{
  fc_snprintf(buf, buf_len, "%d", value);
  return buf;
}

/****************************************************************************
  Returns the minimal integer value for this setting.
****************************************************************************/
int setting_int_min(const struct setting *pset)
{
  fc_assert_ret_val(pset->stype == SSET_INT, 0);
  return pset->integer.min_value;
}

/****************************************************************************
  Returns the maximal integer value for this setting.
****************************************************************************/
int setting_int_max(const struct setting *pset)
{
  fc_assert_ret_val(pset->stype == SSET_INT, 0);
  return pset->integer.max_value;
}

/****************************************************************************
  Set the setting to 'val'. Returns TRUE on success. If it fails, the
  reason of the failure is available by the function setting_error().
****************************************************************************/
bool setting_int_set(struct setting *pset, int val,
                     struct connection *caller, char *reject_msg,
                     size_t reject_msg_len)
{
  if (!setting_is_changeable(pset, caller, reject_msg, reject_msg_len)
      || !setting_int_validate(pset, val, caller, reject_msg,
                               reject_msg_len)) {
    return FALSE;
  }

  *pset->integer.pvalue = val;
  return TRUE;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available by the function setting_error().

  FIXME: also check the access level of pconn.
****************************************************************************/
bool setting_int_validate(const struct setting *pset, int val,
                          struct connection *caller, char *reject_msg,
                          size_t reject_msg_len)
{
  if (SSET_INT != pset->stype) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("This setting is not an integer."));
    return FALSE;
  }

  if (val < pset->integer.min_value || val > pset->integer.max_value) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("Value out of range: %d (min: %d; max: %d)."),
                      val, pset->integer.min_value, pset->integer.max_value);
    return FALSE;
  }

  return (!pset->integer.validate
          || pset->integer.validate(val, caller, reject_msg,
                                    reject_msg_len));
}

/****************************************************************************
  Compute the string representation of the value for this string setting.
****************************************************************************/
static const char *setting_str_to_str(const struct setting *pset,
                                      const char *value, bool pretty,
                                      char *buf, size_t buf_len)
{
  if (pretty) {
    fc_snprintf(buf, buf_len, "\"%s\"", value);
  } else {
    fc_strlcpy(buf, value, buf_len);
  }
  return buf;
}

/****************************************************************************
  Set the setting to 'val'. Returns TRUE on success. If it fails, the
  reason of the failure is available by the function setting_error().
****************************************************************************/
bool setting_str_set(struct setting *pset, const char *val,
                     struct connection *caller, char *reject_msg,
                     size_t reject_msg_len)
{
  if (!setting_is_changeable(pset, caller, reject_msg, reject_msg_len)
      || !setting_str_validate(pset, val, caller, reject_msg,
                               reject_msg_len)) {
    return FALSE;
  }

  fc_strlcpy(pset->string.value, val, pset->string.value_size);
  return TRUE;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available by the function setting_error().

  FIXME: also check the access level of pconn.
****************************************************************************/
bool setting_str_validate(const struct setting *pset, const char *val,
                          struct connection *caller, char *reject_msg,
                          size_t reject_msg_len)
{
  if (SSET_STRING != pset->stype) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("This setting is not a string."));
    return FALSE;
  }

  if (strlen(val) >= pset->string.value_size) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("String value too long (max length: %lu)."),
                      (unsigned long) pset->string.value_size);
    return FALSE;
  }

  return (!pset->string.validate
          || pset->string.validate(val, caller, reject_msg,
                                   reject_msg_len));
}

/****************************************************************************
  Convert the integer to the long support string representation of an
  enumerator. This function must match the secfile_enum_name_data_fn_t type.
****************************************************************************/
static const char *setting_enum_secfile_str(secfile_data_t data, int val)
{
  const struct sset_val_name *name =
      ((const struct setting *) data)->enumerator.name(val);

  return (NULL != name ? name->support : NULL);
}

/****************************************************************************
  Convert the integer to the string representation of an enumerator.
  Return NULL if 'val' is not a valid enumerator.
****************************************************************************/
const char *setting_enum_val(const struct setting *pset, int val,
                             bool pretty)
{
  const struct sset_val_name *name;

  fc_assert_ret_val(SSET_ENUM == pset->stype, NULL);
  name = pset->enumerator.name(val);
  if (NULL == name) {
    return NULL;
  } else if (pretty) {
    return _(name->pretty);
  } else {
    return name->support;
  }
}

/****************************************************************************
  Compute the string representation of the value for this enumerator
  setting.
****************************************************************************/
static const char *setting_enum_to_str(const struct setting *pset,
                                       int value, bool pretty,
                                       char *buf, size_t buf_len)
{
  const struct sset_val_name *name = pset->enumerator.name(value);

  if (pretty) {
    fc_snprintf(buf, buf_len, "\"%s\" (%s)",
                Q_(name->pretty), name->support);
  } else {
    fc_strlcpy(buf, name->support, buf_len);
  }
  return buf;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available in the optionnal parameter
  'reject_msg'.

  FIXME: also check the access level of pconn.
****************************************************************************/
static bool setting_enum_validate_base(const struct setting *pset,
                                       const char *val, int *pint_val,
                                       struct connection *caller,
                                       char *reject_msg,
                                       size_t reject_msg_len)
{
  char buf[256];

  if (SSET_ENUM != pset->stype) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("This setting is not an enumerator."));
    return FALSE;
  }

  sz_strlcpy(buf, val);
  remove_leading_trailing_spaces(buf);

  return (setting_match_prefix(pset->enumerator.name, buf, pint_val,
                               reject_msg, reject_msg_len)
          && (NULL == pset->enumerator.validate
              || pset->enumerator.validate(*pint_val, caller, reject_msg,
                                           reject_msg_len)));
}

/****************************************************************************
  Helper function to write value to enumerator setting 
****************************************************************************/
static bool set_enum_value(struct setting *pset, int val)
{
  switch(pset->enumerator.store_size) {
   case sizeof(int):
     {
       int *to_int = pset->enumerator.pvalue;

       *to_int = val;
     }
     break;
   case sizeof(char):
     {
       char *to_char = pset->enumerator.pvalue;

       *to_char = (char) val;
     }
     break;
   case sizeof(short):
     {
       short *to_short = pset->enumerator.pvalue;

       *to_short = (short) val;
     }
     break;
   default:
     return FALSE;
  }

  return TRUE;
}

/****************************************************************************
  Helper function to read value from enumerator setting 
****************************************************************************/
static int read_enum_value(const struct setting *pset)
{
  int val;

  switch(pset->enumerator.store_size) {
   case sizeof(int):
     val = *((int *)pset->enumerator.pvalue);
     break;
   case sizeof(char):
     val = *((char *)pset->enumerator.pvalue);
     break;
   case sizeof(short):
     val = *((short *)pset->enumerator.pvalue);
     break;
   default:
     log_error("Illegal enum store size %d, can't read value", pset->enumerator.store_size);
     return 0;
  }

  return val;
}

/****************************************************************************
  Set the setting to 'val'. Returns TRUE on success. If it fails, the
  reason of the failure is available in the optionnal parameter
  'reject_msg'.
****************************************************************************/
bool setting_enum_set(struct setting *pset, const char *val,
                      struct connection *caller, char *reject_msg,
                      size_t reject_msg_len)
{
  int int_val;

  if (!setting_is_changeable(pset, caller, reject_msg, reject_msg_len)) {
    return FALSE;
  }

  if (!setting_enum_validate_base(pset, val, &int_val, caller,
                                  reject_msg, reject_msg_len)) {
    return FALSE;
  }

  if (!set_enum_value(pset, int_val)) {
    log_error("Illegal enumerator value size %d for %s",
              pset->enumerator.store_size, val);
    return FALSE;
  }

  return TRUE;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available in the optionnal parameter
  'reject_msg'.
****************************************************************************/
bool setting_enum_validate(const struct setting *pset, const char *val,
                           struct connection *caller, char *reject_msg,
                           size_t reject_msg_len)
{
  int int_val;

  return setting_enum_validate_base(pset, val, &int_val, caller,
                                    reject_msg, reject_msg_len);
}

/****************************************************************************
  Convert the integer to the long support string representation of an
  enumerator. This function must match the secfile_enum_name_data_fn_t type.
****************************************************************************/
static const char *setting_bitwise_secfile_str(secfile_data_t data, int bit)
{
  const struct sset_val_name *name =
      ((const struct setting *) data)->bitwise.name(bit);

  return (NULL != name ? name->support : NULL);
}

/****************************************************************************
  Convert the bit number to its string representation.
  Return NULL if 'bit' is not a valid bit.
****************************************************************************/
const char *setting_bitwise_bit(const struct setting *pset,
                                int bit, bool pretty)
{
  const struct sset_val_name *name;

  fc_assert_ret_val(SSET_BITWISE == pset->stype, NULL);
  name = pset->bitwise.name(bit);
  if (NULL == name) {
    return NULL;
  } else if (pretty) {
    return _(name->pretty);
  } else {
    return name->support;
  }
}

/****************************************************************************
  Compute the string representation of the value for this bitwise setting.
****************************************************************************/
static const char *setting_bitwise_to_str(const struct setting *pset,
                                          unsigned value, bool pretty,
                                          char *buf, size_t buf_len)
{
  const struct sset_val_name *name;
  char *old_buf = buf;
  int bit;

  if (pretty) {
    char buf2[64];
    struct astring astr = ASTRING_INIT;
    struct strvec *vec = strvec_new();
    size_t len;

    for (bit = 0; (name = pset->bitwise.name(bit)); bit++) {
      if ((1 << bit) & value) {
        /* TRANS: only emphasizing a string. */
        fc_snprintf(buf2, sizeof(buf2), _("\"%s\""), Q_(name->pretty));
        strvec_append(vec, buf2);
      }
    }

    if (0 == strvec_size(vec)) {
      /* No value. */
      fc_assert(0 == value);
      /* TRANS: Bitwise setting has no bits set. */
      fc_strlcpy(buf, _("empty value"), buf_len);
      strvec_destroy(vec);
      return buf;
    }

    strvec_to_and_list(vec, &astr);
    strvec_destroy(vec);
    fc_strlcpy(buf, astr_str(&astr), buf_len);
    astr_free(&astr);
    fc_strlcat(buf, " (", buf_len);
    len = strlen(buf);
    buf += len;
    buf_len -= len;
  }

  /* Long support part. */
  buf[0] = '\0';
  for (bit = 0; (name = pset->bitwise.name(bit)); bit++) {
    if ((1 << bit) & value) {
      if ('\0' != buf[0]) {
        fc_strlcat(buf, "|", buf_len);
      }
      fc_strlcat(buf, name->support, buf_len);
    }
  }

  if (pretty) {
    fc_strlcat(buf, ")", buf_len);
  }
  return old_buf;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available in the optionnal parameter
  'reject_msg'.

  FIXME: also check the access level of pconn.
****************************************************************************/
static bool setting_bitwise_validate_base(const struct setting *pset,
                                          const char *val,
                                          unsigned *pint_val,
                                          struct connection *caller,
                                          char *reject_msg,
                                          size_t reject_msg_len)
{
  char buf[256];
  const char *p;
  int bit;

  if (SSET_BITWISE != pset->stype) {
    settings_snprintf(reject_msg, reject_msg_len,
                      _("This setting is not a bitwise."));
    return FALSE;
  }

  *pint_val = 0;

  /* Value names are separated by '|'. */
  do {
    p = strchr(val, '|');
    if (NULL != p) {
      p++;
      fc_strlcpy(buf, val, MIN(p - val, sizeof(buf)));
    } else {
      /* Last segment, full copy. */
      sz_strlcpy(buf, val);
    }
    remove_leading_trailing_spaces(buf);
    if (NULL == p && '\0' == buf[0] && 0 == *pint_val) {
      /* Empty string = value 0. */
      break;
    } else if (!setting_match_prefix(pset->bitwise.name, buf, &bit,
                                     reject_msg, reject_msg_len)) {
      return FALSE;
    }
    *pint_val |= 1 << bit;
    val = p;
  } while (NULL != p);

  return (NULL == pset->bitwise.validate
          || pset->bitwise.validate(*pint_val, caller,
                                    reject_msg, reject_msg_len));
}

/****************************************************************************
  Set the setting to 'val'. Returns TRUE on success. If it fails, the
  reason of the failure is available in the optionnal parameter
  'reject_msg'.
****************************************************************************/
bool setting_bitwise_set(struct setting *pset, const char *val,
                         struct connection *caller, char *reject_msg,
                         size_t reject_msg_len)
{
  unsigned int_val;

  if (!setting_is_changeable(pset, caller, reject_msg, reject_msg_len)
      || !setting_bitwise_validate_base(pset, val, &int_val, caller,
                                        reject_msg, reject_msg_len)) {
    return FALSE;
  }

  *pset->bitwise.pvalue = int_val;
  return TRUE;
}

/****************************************************************************
  Returns TRUE if 'val' is a valid value for this setting. If it's not,
  the reason of the failure is available in the optionnal parameter
  'reject_msg'.
****************************************************************************/
bool setting_bitwise_validate(const struct setting *pset, const char *val,
                              struct connection *caller, char *reject_msg,
                              size_t reject_msg_len)
{
  unsigned int_val;

  return setting_bitwise_validate_base(pset, val, &int_val, caller,
                                       reject_msg, reject_msg_len);
}

/****************************************************************************
  Compute the name of the current value of the setting.
****************************************************************************/
const char *setting_value_name(const struct setting *pset, bool pretty,
                               char *buf, size_t buf_len)
{
  fc_assert_ret_val(NULL != pset, NULL);
  fc_assert_ret_val(NULL != buf, NULL);
  fc_assert_ret_val(0 < buf_len, NULL);

  switch (pset->stype) {
  case SSET_BOOL:
    return setting_bool_to_str(pset, *pset->boolean.pvalue,
                               pretty, buf, buf_len);
  case SSET_INT:
    return setting_int_to_str(pset, *pset->integer.pvalue,
                              pretty, buf, buf_len);
  case SSET_STRING:
    return setting_str_to_str(pset, pset->string.value,
                              pretty, buf, buf_len);
  case SSET_ENUM:
    return setting_enum_to_str(pset, read_enum_value(pset),
                               pretty, buf, buf_len);
  case SSET_BITWISE:
    return setting_bitwise_to_str(pset, *pset->bitwise.pvalue,
                                  pretty, buf, buf_len);
  }

  log_error("%s(): Setting \"%s\" (nb %d) not handled in switch statement.",
            __FUNCTION__, setting_name(pset), setting_number(pset));
  return NULL;
}

/****************************************************************************
  Compute the name of the default value of the setting.
****************************************************************************/
const char *setting_default_name(const struct setting *pset, bool pretty,
                                 char *buf, size_t buf_len)
{
  fc_assert_ret_val(NULL != pset, NULL);
  fc_assert_ret_val(NULL != buf, NULL);
  fc_assert_ret_val(0 < buf_len, NULL);

  switch (pset->stype) {
  case SSET_BOOL:
    return setting_bool_to_str(pset, pset->boolean.default_value,
                               pretty, buf, buf_len);
  case SSET_INT:
    return setting_int_to_str(pset, pset->integer.default_value,
                              pretty, buf, buf_len);
  case SSET_STRING:
    return setting_str_to_str(pset, pset->string.default_value,
                              pretty, buf, buf_len);
  case SSET_ENUM:
    return setting_enum_to_str(pset, pset->enumerator.default_value,
                               pretty, buf, buf_len);
  case SSET_BITWISE:
    return setting_bitwise_to_str(pset, pset->bitwise.default_value,
                                  pretty, buf, buf_len);
  }

  log_error("%s(): Setting \"%s\" (nb %d) not handled in switch statement.",
            __FUNCTION__, setting_name(pset), setting_number(pset));
  return NULL;
}

/****************************************************************************
  Update the setting to the default value
****************************************************************************/
static void setting_set_to_default(struct setting *pset)
{
  switch (pset->stype) {
  case SSET_BOOL:
    (*pset->boolean.pvalue) = pset->boolean.default_value;
    break;
  case SSET_INT:
    (*pset->integer.pvalue) = pset->integer.default_value;
    break;
  case SSET_STRING:
    fc_strlcpy(pset->string.value, pset->string.default_value,
               pset->string.value_size);
    break;
  case SSET_ENUM:
    set_enum_value(pset, pset->enumerator.default_value);
    break;
  case SSET_BITWISE:
    (*pset->bitwise.pvalue) = pset->bitwise.default_value;
    break;
  }
}

/********************************************************************
  Execute the action callback if needed.
*********************************************************************/
void setting_action(const struct setting *pset)
{
  if (pset->action != NULL) {
    pset->action(pset);
  }
}

/**************************************************************************
  Load game settings from ruleset file 'game.ruleset'.
**************************************************************************/
bool settings_ruleset(struct section_file *file, const char *section,
                      bool act)
{
  const char *name;
  int j;

  /* Unlock all settings. */
  settings_iterate(SSET_ALL, pset) {
    setting_lock_set(pset, FALSE);
    setting_set_to_default(pset);
  } settings_iterate_end;

  /* settings */
  if (NULL == secfile_section_by_name(file, section)) {
    /* no settings in ruleset file */
    log_verbose("no [%s] section for game settings in %s", section,
                secfile_name(file));
    return FALSE;
  }

  for (j = 0; (name = secfile_lookup_str_default(file, NULL, "%s.set%d.name",
                                                 section, j)); j++) {
    char path[256];
    fc_snprintf(path, sizeof(path), "%s.set%d", section, j);

    if (!setting_ruleset_one(file, name, path)) {
      log_error("unknown setting in '%s': %s", secfile_name(file), name);
    }
  }

  /* Execute all setting actions to consider actions due to the 
   * default values. */
  if (act) {
    settings_iterate(SSET_ALL, pset) {
      setting_action(pset);
    } settings_iterate_end;
  }

  /* send game settings */
  send_server_settings(NULL);

  return TRUE;
}

/**************************************************************************
  Set one setting from the game.ruleset file.
**************************************************************************/
static bool setting_ruleset_one(struct section_file *file,
                                const char *name, const char *path)
{
  struct setting *pset = NULL;
  char reject_msg[256], buf[256];
  bool lock;

  settings_iterate(SSET_ALL, pset_check) {
    if (0 == fc_strcasecmp(setting_name(pset_check), name)) {
      pset = pset_check;
      break;
    }
  } settings_iterate_end;

  if (pset == NULL) {
    /* no setting found */
    return FALSE;
  }

  switch (pset->stype) {
  case SSET_BOOL:
    {
      int ival;
      bool val;

      /* Allow string with same boolean representation as accepted on
       * server command line */
      if (secfile_lookup_enum_data(file, &ival, FALSE,
                                   setting_bool_secfile_str, pset,
                                   "%s.value", path)) {
        val = (ival != 0);
      } else if (!secfile_lookup_bool(file, &val, "%s.value", path)) {
        log_error("Can't read value for setting '%s': %s", name,
                  secfile_error());
        break;
      }
      if (val != *pset->boolean.pvalue) {
        if (NULL == pset->boolean.validate
            || pset->boolean.validate(val, NULL, reject_msg,
                                      sizeof(reject_msg))) {
          *pset->boolean.pvalue = val;
          log_normal(_("Ruleset: '%s' has been set to %s."),
                     setting_name(pset),
                     setting_value_name(pset, TRUE, buf, sizeof(buf)));
        } else {
          log_error("%s", reject_msg);
        }
      }
    }
    break;

  case SSET_INT:
    {
      int val;

      if (!secfile_lookup_int(file, &val, "%s.value", path)) {
          log_error("Can't read value for setting '%s': %s", name,
                    secfile_error());
      } else if (val != *pset->integer.pvalue) {
        if (setting_int_set(pset, val, NULL, reject_msg,
                            sizeof(reject_msg))) {
          log_normal(_("Ruleset: '%s' has been set to %s."),
                     setting_name(pset),
                     setting_value_name(pset, TRUE, buf, sizeof(buf)));
        } else {
          log_error("%s", reject_msg);
        }
      }
    }
    break;

  case SSET_STRING:
    {
      const char *val = secfile_lookup_str(file, "%s.value", path);

      if (NULL == val) {
        log_error("Can't read value for setting '%s': %s", name,
                  secfile_error());
      } else if (0 != strcmp(val, pset->string.value)) {
        if (setting_str_set(pset, val, NULL, reject_msg,
                            sizeof(reject_msg))) {
          log_normal(_("Ruleset: '%s' has been set to %s."),
                     setting_name(pset),
                     setting_value_name(pset, TRUE, buf, sizeof(buf)));
        } else {
          log_error("%s", reject_msg);
        }
      }
    }
    break;

  case SSET_ENUM:
    {
      int val;

      if (!secfile_lookup_enum_data(file, &val, FALSE,
                                    setting_enum_secfile_str, pset,
                                    "%s.value", path)) {
        log_error("Can't read value for setting '%s': %s",
                  name, secfile_error());
      } else if (val != read_enum_value(pset)) {
        if (NULL == pset->enumerator.validate
            || pset->enumerator.validate(val, NULL, reject_msg,
                                         sizeof(reject_msg))) {
          set_enum_value(pset, val);
          log_normal(_("Ruleset: '%s' has been set to %s."),
                     setting_name(pset),
                     setting_value_name(pset, TRUE, buf, sizeof(buf)));
        } else {
          log_error("%s", reject_msg);
        }
      }
    }
    break;

  case SSET_BITWISE:
    {
      int val;

      if (!secfile_lookup_enum_data(file, &val, TRUE,
                                    setting_bitwise_secfile_str, pset,
                                    "%s.value", path)) {
        log_error("Can't read value for setting '%s': %s",
                  name, secfile_error());
      } else if (val != *pset->bitwise.pvalue) {
        if (NULL == pset->bitwise.validate
            || pset->bitwise.validate((unsigned) val, NULL,
                                      reject_msg, sizeof(reject_msg))) {
          *pset->bitwise.pvalue = val;
          log_normal(_("Ruleset: '%s' has been set to %s."),
                     setting_name(pset),
                     setting_value_name(pset, TRUE, buf, sizeof(buf)));
        } else {
          log_error("%s", reject_msg);
        }
      }
    }
    break;
  }

  /* set lock */
  lock = secfile_lookup_bool_default(file, FALSE, "%s.lock", path);

  if (lock) {
    /* set lock */
    setting_lock_set(pset, lock);
    log_normal(_("Ruleset: '%s' has been locked by the ruleset."),
               setting_name(pset));
  }

  return TRUE;
}

/**************************************************************************
  Returns whether the setting has been changed (is not default).
**************************************************************************/
bool setting_changed(const struct setting *pset)
{
  switch (setting_type(pset)) {
  case SSET_BOOL:
    return (*pset->boolean.pvalue != pset->boolean.default_value);
  case SSET_INT:
    return (*pset->integer.pvalue != pset->integer.default_value);
  case SSET_STRING:
    return (0 != strcmp(pset->string.value, pset->string.default_value));
  case SSET_ENUM:
    return (read_enum_value(pset) != pset->enumerator.default_value);
  case SSET_BITWISE:
    return (*pset->bitwise.pvalue != pset->bitwise.default_value);
  }

  log_error("%s(): Setting \"%s\" (nb %d) not handled in switch statement.",
            __FUNCTION__, setting_name(pset), setting_number(pset));
  return FALSE;
}

/**************************************************************************
  Returns if the setting is locked by the ruleset.
**************************************************************************/
bool setting_locked(const struct setting *pset)
{
  return pset->locked;
}

/**************************************************************************
  Set the value for the lock of a setting.
**************************************************************************/
void setting_lock_set(struct setting *pset, bool lock)
{
  pset->locked = lock;
}

/**************************************************************************
  Save the setting value of the current game.
**************************************************************************/
static void setting_game_set(struct setting *pset, bool init)
{
  switch (setting_type(pset)) {
  case SSET_BOOL:
    pset->boolean.game_value = *pset->boolean.pvalue;
    break;

  case SSET_INT:
    pset->integer.game_value = *pset->integer.pvalue;
    break;

  case SSET_STRING:
    if (init) {
      pset->string.game_value
        = fc_calloc(1, pset->string.value_size
                       * sizeof(pset->string.game_value));
    }
    fc_strlcpy(pset->string.game_value, pset->string.value,
              pset->string.value_size);
    break;

  case SSET_ENUM:
    pset->enumerator.game_value = read_enum_value(pset);
    break;

  case SSET_BITWISE:
    pset->bitwise.game_value = *pset->bitwise.pvalue;
    break;
  }
}

/**************************************************************************
  Free the memory used for the settings at game start.
**************************************************************************/
static void setting_game_free(struct setting *pset)
{
  if (setting_type(pset) == SSET_STRING) {
    FC_FREE(pset->string.game_value);
  }
}

/**************************************************************************
  Restore the setting to the value used at the start of the current game.
**************************************************************************/
static void setting_game_restore(struct setting *pset)
{
  char reject_msg[256] = "", buf[256];
  bool res = FALSE;

  if (!setting_is_changeable(pset, NULL, reject_msg, sizeof(reject_msg))) {
    log_debug("Can't restore '%s': %s", setting_name(pset),
              reject_msg);
    return;
  }

  switch (setting_type(pset)) {
  case SSET_BOOL:
    res = (NULL != setting_bool_to_str(pset, pset->boolean.game_value,
                                       FALSE, buf, sizeof(buf))
           && setting_bool_set(pset, buf, NULL, reject_msg,
                               sizeof(reject_msg)));
    break;

  case SSET_INT:
    res = setting_int_set(pset, pset->integer.game_value, NULL, reject_msg,
                          sizeof(reject_msg));
    break;

  case SSET_STRING:
    res = setting_str_set(pset, pset->string.game_value, NULL, reject_msg,
                          sizeof(reject_msg));
    break;

  case SSET_ENUM:
    res = (NULL != setting_enum_to_str(pset, pset->enumerator.game_value,
                                       FALSE, buf, sizeof(buf))
           && setting_enum_set(pset, buf, NULL, reject_msg,
                               sizeof(reject_msg)));
    break;

  case SSET_BITWISE:
    res = (NULL != setting_bitwise_to_str(pset, pset->bitwise.game_value,
                                          FALSE, buf, sizeof(buf))
           && setting_bitwise_set(pset, buf, NULL, reject_msg,
                                  sizeof(reject_msg)));
    break;
  }

  if (!res) {
    log_error("Error restoring setting '%s' to the value from game start: "
              "%s", setting_name(pset), reject_msg);
  }
}

/**************************************************************************
  Save setting values at the start of  the game.
**************************************************************************/
void settings_game_start(void)
{
  settings_iterate(SSET_ALL, pset) {
    setting_game_set(pset, FALSE);
  } settings_iterate_end;

  /* Settings from the start of the game are saved. */
  game.server.settings_gamestart_valid = TRUE;
}

/********************************************************************
  Save game settings.
*********************************************************************/
void settings_game_save(struct section_file *file, const char *section)
{
  int set_count = 0;

  settings_iterate(SSET_ALL, pset) {
    secfile_insert_str(file, setting_name(pset),
                       "%s.set%d.name", section, set_count);
    switch (setting_type(pset)) {
    case SSET_BOOL:
      secfile_insert_bool(file, *pset->boolean.pvalue,
                          "%s.set%d.value", section, set_count);
      secfile_insert_bool(file, pset->boolean.game_value,
                          "%s.set%d.gamestart", section, set_count);
      break;
    case SSET_INT:
      secfile_insert_int(file, *pset->integer.pvalue,
                          "%s.set%d.value", section, set_count);
      secfile_insert_int(file, pset->integer.game_value,
                          "%s.set%d.gamestart", section, set_count);
      break;
    case SSET_STRING:
      secfile_insert_str(file, pset->string.value,
                          "%s.set%d.value", section, set_count);
      secfile_insert_str(file, pset->string.game_value,
                          "%s.set%d.gamestart", section, set_count);
      break;
    case SSET_ENUM:
      secfile_insert_enum_data(file, read_enum_value(pset), FALSE,
                               setting_enum_secfile_str, pset,
                               "%s.set%d.value", section, set_count);
      secfile_insert_enum_data(file, pset->enumerator.game_value, FALSE,
                               setting_enum_secfile_str, pset,
                               "%s.set%d.gamestart", section, set_count);
      break;
    case SSET_BITWISE:
      secfile_insert_enum_data(file, *pset->bitwise.pvalue, TRUE,
                               setting_bitwise_secfile_str, pset,
                               "%s.set%d.value", section, set_count);
      secfile_insert_enum_data(file, pset->bitwise.game_value, TRUE,
                               setting_bitwise_secfile_str, pset,
                               "%s.set%d.gamestart", section, set_count);
      break;
    }
    set_count++;
  } settings_iterate_end;

  secfile_insert_int(file, set_count, "%s.set_count", section);
  secfile_insert_bool(file, game.server.settings_gamestart_valid,
                      "%s.gamestart_valid", section);
}

/********************************************************************
  Restore all settings from a savegame.
*********************************************************************/
void settings_game_load(struct section_file *file, const char *section)
{
  const char *name;
  char reject_msg[256], buf[256];
  int i, set_count;
  int oldcitymindist = game.info.citymindist; /* backwards compat, see below */

  /* Compatibility with savegames created with older versions is usually
   * handled as conversions in savegame2.c compat_load_<version>() */

  if (!secfile_lookup_int(file, &set_count, "%s.set_count", section)) {
    /* Old savegames and scenarios doesn't contain this, not an error. */
    log_verbose("Can't read the number of settings in the save file.");
    return;
  }

  /* Check if the saved settings are valid settings from game start. */
  game.server.settings_gamestart_valid
    = secfile_lookup_bool_default(file, FALSE, "%s.gamestart_valid",
                                  section);

  for (i = 0; i < set_count; i++) {
    name = secfile_lookup_str(file, "%s.set%d.name", section, i);

    settings_iterate(SSET_ALL, pset) {
      if (fc_strcasecmp(setting_name(pset), name) != 0) {
        continue;
      }

      /* Load the current value of the setting. */
      switch (pset->stype) {
      case SSET_BOOL:
        {
          bool val;

          if (!secfile_lookup_bool(file, &val, "%s.set%d.value", section,
                                   i)) {
            log_verbose("Option '%s' not defined in the savegame: %s", name,
                        secfile_error());
          } else if (val != *pset->boolean.pvalue) {
            if (setting_is_changeable(pset, NULL, reject_msg,
                                      sizeof(reject_msg))
                && (NULL == pset->boolean.validate
                    || pset->boolean.validate(val, NULL, reject_msg,
                                              sizeof(reject_msg)))) {
              *pset->boolean.pvalue = val;
              log_normal(_("Savegame: '%s' has been set to %s."),
                         setting_name(pset),
                         setting_value_name(pset, TRUE, buf, sizeof(buf)));
            } else {
              log_error("Savegame: error restoring '%s' . (%s)",
                        setting_name(pset), reject_msg);
            }
          }
        }
        break;

      case SSET_INT:
        {
          int val;

          if (!secfile_lookup_int(file, &val, "%s.set%d.value", section, i)) {
            log_verbose("Option '%s' not defined in the savegame: %s", name,
                        secfile_error());
          } else if (val != *pset->integer.pvalue) {
            if (setting_is_changeable(pset, NULL, reject_msg,
                                      sizeof(reject_msg))
                && (NULL == pset->integer.validate
                    || pset->integer.validate(val, NULL, reject_msg,
                                              sizeof(reject_msg)))) {
              *pset->integer.pvalue = val;
              log_normal(_("Savegame: '%s' has been set to %s."),
                         setting_name(pset),
                         setting_value_name(pset, TRUE, buf, sizeof(buf)));
            } else {
              log_error("Savegame: error restoring '%s' . (%s)",
                        setting_name(pset), reject_msg);
            }
          }
        }
        break;

      case SSET_STRING:
        {
          const char *val = secfile_lookup_str(file, "%s.set%d.value",
                                               section, i);

          if (NULL == val) {
            log_verbose("Option '%s' not defined in the savegame: %s", name,
                        secfile_error());
          } else if (0 != strcmp(val, pset->string.value)) {
            if (setting_str_set(pset, val, NULL, reject_msg,
                                sizeof(reject_msg))) {
              log_normal(_("Savegame: '%s' has been set to %s."),
                         setting_name(pset),
                         setting_value_name(pset, TRUE, buf, sizeof(buf)));
            } else {
              log_error("Savegame: error restoring '%s' . (%s)",
                        setting_name(pset), reject_msg);
            }
          }
        }
        break;

      case SSET_ENUM:
        {
          int val;

          if (!secfile_lookup_enum_data(file, &val, FALSE,
                                        setting_enum_secfile_str, pset,
                                        "%s.set%d.value", section, i)) {
            log_verbose("Option '%s' not defined in the savegame: %s", name,
                        secfile_error());
          } else if (val != read_enum_value(pset)) {
            if (setting_is_changeable(pset, NULL, reject_msg,
                                      sizeof(reject_msg))
                && (NULL == pset->enumerator.validate
                    || pset->enumerator.validate(val, NULL, reject_msg,
                                                 sizeof(reject_msg)))) {
              set_enum_value(pset, val);
              log_normal(_("Savegame: '%s' has been set to %s."),
                         setting_name(pset),
                         setting_value_name(pset, TRUE, buf, sizeof(buf)));
            } else {
              log_error("Savegame: error restoring '%s' . (%s)",
                        setting_name(pset), reject_msg);
            }
          }
        }
        break;

      case SSET_BITWISE:
        {
          int val;

          if (!secfile_lookup_enum_data(file, &val, TRUE,
                                        setting_bitwise_secfile_str, pset,
                                        "%s.set%d.value", section, i)) {
            log_verbose("Option '%s' not defined in the savegame: %s", name,
                        secfile_error());
          } else if (val != *pset->bitwise.pvalue) {
            if (setting_is_changeable(pset, NULL, reject_msg,
                                      sizeof(reject_msg))
                && (NULL == pset->bitwise.validate
                    || pset->bitwise.validate(val, NULL, reject_msg,
                                              sizeof(reject_msg)))) {
              *pset->bitwise.pvalue = val;
              log_normal(_("Savegame: '%s' has been set to %s."),
                         setting_name(pset),
                         setting_value_name(pset, TRUE, buf, sizeof(buf)));
            } else {
              log_error("Savegame: error restoring '%s' . (%s)",
                        setting_name(pset), reject_msg);
            }
          }
        }
        break;
      }

      if (game.server.settings_gamestart_valid) {
        /* Load the value of the setting at the start of the game. */
        switch (pset->stype) {
        case SSET_BOOL:
          pset->boolean.game_value =
              secfile_lookup_bool_default(file, *pset->boolean.pvalue,
                                          "%s.set%d.gamestart", section, i);
          break;

        case SSET_INT:
          pset->integer.game_value =
              secfile_lookup_int_default(file, *pset->integer.pvalue,
                                         "%s.set%d.gamestart", section, i);
          break;

        case SSET_STRING:
          fc_strlcpy(pset->string.game_value,
                     secfile_lookup_str_default(file, pset->string.value,
                                                "%s.set%d.gamestart",
                                                section, i),
                     pset->string.value_size);
          break;

        case SSET_ENUM:
          pset->enumerator.game_value =
              secfile_lookup_enum_default_data(file,
                  read_enum_value(pset), FALSE, setting_enum_secfile_str,
                  pset, "%s.set%d.gamestart", section, i);
          break;

        case SSET_BITWISE:
          pset->bitwise.game_value =
              secfile_lookup_enum_default_data(file,
                  *pset->bitwise.pvalue, TRUE, setting_bitwise_secfile_str,
                  pset, "%s.set%d.gamestart", section, i);
          break;
        }
      }
    } settings_iterate_end;
  }

  /* Backwards compatibility for pre-2.4 savegames: citymindist=0 used to mean
   * take from ruleset min_dist_bw_cities, but that no longer exists.
   * This is here rather than in savegame2.c compat functions, as we need
   * to have loaded the relevant ruleset to know what to set it to (the
   * ruleset and any 'citymindist' setting it contains will have been loaded
   * before this function was called). */
  if (game.info.citymindist == 0) {
    game.info.citymindist = oldcitymindist;
  }

  settings_iterate(SSET_ALL, pset) {
    /* Have to do this at the end due to dependencies ('aifill' and
     * 'maxplayer'). */
    setting_action(pset);
  } settings_iterate_end;
}

/**************************************************************************
  Reset all settings to the values at game start.
**************************************************************************/
bool settings_game_reset(void)
{
  if (!game.server.settings_gamestart_valid) {
    log_debug("No saved settings from the game start available.");
    return FALSE;
  }

  settings_iterate(SSET_ALL, pset) {
    setting_game_restore(pset);
  } settings_iterate_end;

  return TRUE;
}

/**************************************************************************
  Initialize stuff related to this code module.
**************************************************************************/
void settings_init(bool act)
{
  settings_list_init();

  settings_iterate(SSET_ALL, pset) {
    setting_lock_set(pset, FALSE);
    setting_set_to_default(pset);
    setting_game_set(pset, TRUE);
    if (act) {
      setting_action(pset);
    }
  } settings_iterate_end;

  settings_list_update();
}

/********************************************************************
  Reset all settings iff they are changeable.
*********************************************************************/
void settings_reset(void)
{
  settings_iterate(SSET_ALL, pset) {
    if (setting_is_changeable(pset, NULL, NULL, 0)) {
      setting_set_to_default(pset);
      setting_action(pset);
    }
  } settings_iterate_end;
}

/**************************************************************************
  Update stuff every turn that is related to this code module. Run this
  on turn end.
**************************************************************************/
void settings_turn(void)
{
  /* Nothing at the moment. */
}

/**************************************************************************
  Deinitialize stuff related to this code module.
**************************************************************************/
void settings_free(void)
{
  settings_iterate(SSET_ALL, pset) {
    setting_game_free(pset);
  } settings_iterate_end;

  settings_list_free();
}

/****************************************************************************
  Returns the total number of settings.
****************************************************************************/
int settings_number(void)
{
  return SETTINGS_NUM;
}

/****************************************************************************
  Tell the client about just one server setting.  Call this after a setting
  is saved.
****************************************************************************/
void send_server_setting(struct conn_list *dest, const struct setting *pset)
{
  if (!dest) {
    dest = game.est_connections;
  }

#define PACKET_COMMON_INIT(packet, pset, pconn)                             \
  memset(&packet, 0, sizeof(packet));                                       \
  packet.id = setting_number(pset);                                         \
  packet.is_visible = setting_is_visible(pset, pconn);                      \
  packet.is_changeable = setting_is_changeable(pset, pconn, NULL, 0);       \
  packet.initial_setting = game.info.is_new_game;

  switch (setting_type(pset)) {
  case SSET_BOOL:
    {
      struct packet_server_setting_bool packet;

      conn_list_iterate(dest, pconn) {
        PACKET_COMMON_INIT(packet, pset, pconn);
        if (packet.is_visible) {
          packet.val = *pset->boolean.pvalue;
          packet.default_val = pset->boolean.default_value;
        }
        send_packet_server_setting_bool(pconn, &packet);
      } conn_list_iterate_end;
    }
    break;
  case SSET_INT:
    {
      struct packet_server_setting_int packet;

      conn_list_iterate(dest, pconn) {
        PACKET_COMMON_INIT(packet, pset, pconn);
        if (packet.is_visible) {
          packet.val = *pset->integer.pvalue;
          packet.default_val = pset->integer.default_value;
          packet.min_val = pset->integer.min_value;
          packet.max_val = pset->integer.max_value;
        }
        send_packet_server_setting_int(pconn, &packet);
      } conn_list_iterate_end;
    }
    break;
  case SSET_STRING:
    {
      struct packet_server_setting_str packet;

      conn_list_iterate(dest, pconn) {
        PACKET_COMMON_INIT(packet, pset, pconn);
        if (packet.is_visible) {
          sz_strlcpy(packet.val, pset->string.value);
          sz_strlcpy(packet.default_val, pset->string.default_value);
        }
        send_packet_server_setting_str(pconn, &packet);
      } conn_list_iterate_end;
    }
    break;
  case SSET_ENUM:
    {
      struct packet_server_setting_enum packet;
      const struct sset_val_name *val_name;
      int i;

      conn_list_iterate(dest, pconn) {
        PACKET_COMMON_INIT(packet, pset, pconn);
        if (packet.is_visible) {
          packet.val = read_enum_value(pset);
          packet.default_val = pset->enumerator.default_value;
          for (i = 0; (val_name = pset->enumerator.name(i)); i++) {
            sz_strlcpy(packet.support_names[i], val_name->support);
            /* Send untranslated string */
            sz_strlcpy(packet.pretty_names[i], val_name->pretty);
          }
          packet.values_num = i;
          fc_assert(i <= ARRAY_SIZE(packet.support_names));
          fc_assert(i <= ARRAY_SIZE(packet.pretty_names));
        }
        send_packet_server_setting_enum(pconn, &packet);
      } conn_list_iterate_end;
    }
    break;
  case SSET_BITWISE:
    {
      struct packet_server_setting_bitwise packet;
      const struct sset_val_name *val_name;
      int i;

      conn_list_iterate(dest, pconn) {
        PACKET_COMMON_INIT(packet, pset, pconn);
        if (packet.is_visible) {
          packet.val = *pset->bitwise.pvalue;
          packet.default_val = pset->bitwise.default_value;
          for (i = 0; (val_name = pset->bitwise.name(i)); i++) {
            sz_strlcpy(packet.support_names[i], val_name->support);
            /* Send untranslated string */
            sz_strlcpy(packet.pretty_names[i], val_name->pretty);
          }
          packet.bits_num = i;
          fc_assert(i <= ARRAY_SIZE(packet.support_names));
          fc_assert(i <= ARRAY_SIZE(packet.pretty_names));
        }
        send_packet_server_setting_bitwise(pconn, &packet);
      } conn_list_iterate_end;
    }
    break;
  }

#undef PACKET_INIT
}

/****************************************************************************
  Tell the client about all server settings.
****************************************************************************/
void send_server_settings(struct conn_list *dest)
{
  settings_iterate(SSET_ALL, pset) {
    send_server_setting(dest, pset);
  } settings_iterate_end;
}

/****************************************************************************
  Send the ALLOW_HACK server settings.  Usually called when the access level
  of the user changes.
****************************************************************************/
void send_server_hack_level_settings(struct conn_list *dest)
{
  settings_iterate(SSET_ALL, pset) {
    if (!pset->to_client) {
      send_server_setting(dest, pset);
    }
  } settings_iterate_end;
}

/****************************************************************************
  Tell the client about all server settings.
****************************************************************************/
void send_server_setting_control(struct connection *pconn)
{
  struct packet_server_setting_control control;
  struct packet_server_setting_const setting;
  int i;

  control.settings_num = SETTINGS_NUM;

  /* Fill in the category strings. */
  fc_assert(SSET_NUM_CATEGORIES <= ARRAY_SIZE(control.category_names));
  control.categories_num = SSET_NUM_CATEGORIES;
  for (i = 0; i < SSET_NUM_CATEGORIES; i++) {
    /* Send untranslated name */
    sz_strlcpy(control.category_names[i], sset_category_name(i));
  }

  /* Send off the control packet. */
  send_packet_server_setting_control(pconn, &control);

  /* Send the constant and common part of the settings. */
  settings_iterate(SSET_ALL, pset) {
    setting.id = setting_number(pset);
    sz_strlcpy(setting.name, setting_name(pset));
    /* Send untranslated strings to client */
    sz_strlcpy(setting.short_help, setting_short_help(pset));
    sz_strlcpy(setting.extra_help, setting_extra_help(pset));
    setting.category = pset->scategory;

    send_packet_server_setting_const(pconn, &setting);
  } settings_iterate_end;
}

/*****************************************************************************
  Initialise sorted settings.
*****************************************************************************/
static void settings_list_init(void)
{
  struct setting *pset;
  int i;

  fc_assert_ret(setting_sorted.init == FALSE);

  /* Do it for all values of enum sset_level. */
  for (i = 0; i < OLEVELS_NUM; i++) {
    setting_sorted.level[i] = setting_list_new();
  }

  for (i = 0; (pset = setting_by_number(i)); i++) {
    /* Add the setting to the list of all settings. */
    setting_list_append(setting_sorted.level[SSET_ALL], pset);

    switch (setting_level(pset)) {
    case SSET_NONE:
      /* No setting should be in this level. */
      fc_assert_msg(setting_level(pset) != SSET_NONE,
                    "No setting level defined for '%s'.", setting_name(pset));
      break;
    case SSET_ALL:
      /* Done above - list of all settings. */
      break;
    case SSET_VITAL:
      setting_list_append(setting_sorted.level[SSET_VITAL], pset);
      break;
    case SSET_SITUATIONAL:
      setting_list_append(setting_sorted.level[SSET_SITUATIONAL], pset);
      break;
    case SSET_RARE:
      setting_list_append(setting_sorted.level[SSET_RARE], pset);
      break;
    case SSET_CHANGED:
    case SSET_LOCKED:
      /* This is done in settings_list_update. */
      break;
    case OLEVELS_NUM:
      /* No setting should be in this level. */
      fc_assert_msg(setting_level(pset) != OLEVELS_NUM,
                    "Invalid setting level for '%s' (%s).",
                    setting_name(pset), sset_level_name(setting_level(pset)));
      break;
    }
  }

  /* Sort the lists. */
  for (i = 0; i < OLEVELS_NUM; i++) {
    setting_list_sort(setting_sorted.level[i], settings_list_cmp);
  }

  setting_sorted.init = TRUE;
}

/*****************************************************************************
  Update sorted settings (changed and locked values).
*****************************************************************************/
void settings_list_update(void)
{
  struct setting *pset;
  int i;

  fc_assert_ret(setting_sorted.init == TRUE);

  /* Clear the lists for changed and locked values. */
  setting_list_clear(setting_sorted.level[SSET_CHANGED]);
  setting_list_clear(setting_sorted.level[SSET_LOCKED]);

  /* Refill them. */
  for (i = 0; (pset = setting_by_number(i)); i++) {
    if (setting_changed(pset)) {
      setting_list_append(setting_sorted.level[SSET_CHANGED], pset);
    }
    if (setting_locked(pset)) {
      setting_list_append(setting_sorted.level[SSET_LOCKED], pset);
    }
  }

  /* Sort them. */
  setting_list_sort(setting_sorted.level[SSET_CHANGED], settings_list_cmp);
  setting_list_sort(setting_sorted.level[SSET_LOCKED], settings_list_cmp);
}

/*****************************************************************************
  Update sorted settings (changed and locked values).
*****************************************************************************/
int settings_list_cmp(const struct setting *const *ppset1,
                      const struct setting *const *ppset2)
{
  const struct setting *pset1 = *ppset1;
  const struct setting *pset2 = *ppset2;

  return fc_strcasecmp(setting_name(pset1), setting_name(pset2));
}

/*****************************************************************************
  Get a settings list of a certain level. Call settings_list_update() before
  if something was changed.
*****************************************************************************/
struct setting_list *settings_list_get(enum sset_level level)
{
  fc_assert_ret_val(setting_sorted.init == TRUE, NULL);
  fc_assert_ret_val(setting_sorted.level[level] != NULL, NULL);
  fc_assert_ret_val(sset_level_is_valid(level), NULL);

  return setting_sorted.level[level];
}

/*****************************************************************************
  Free sorted settings.
*****************************************************************************/
static void settings_list_free(void)
{
  int i;

  fc_assert_ret(setting_sorted.init == TRUE);

  /* Free the lists. */
  for (i = 0; i < OLEVELS_NUM; i++) {
    setting_list_destroy(setting_sorted.level[i]);
  }

  setting_sorted.init = FALSE;
}