external/mit/lua/dist/src/loslib.c

   1 /*      $NetBSD: loslib.c,v 1.1.1.2 2012/03/15 00:08:13 alnsn Exp $     */
   2
   3 /*
   4 ** $Id: loslib.c,v 1.1.1.2 2012/03/15 00:08:13 alnsn Exp $
   5 ** Standard Operating System library
   6 ** See Copyright Notice in lua.h
   7 */
   8
   9
  10 #include <errno.h>
  11 #include <locale.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15
  16 #define loslib_c
  17 #define LUA_LIB
  18
  19 #include "lua.h"
  20
  21 #include "lauxlib.h"
  22 #include "lualib.h"
  23
  24
  25 static int os_pushresult (lua_State *L, int i, const char *filename) {
  26   int en = errno;  /* calls to Lua API may change this value */
  27   if (i) {
  28     lua_pushboolean(L, 1);
  29     return 1;
  30   }
  31   else {
  32     lua_pushnil(L);
  33     lua_pushfstring(L, "%s: %s", filename, strerror(en));
  34     lua_pushinteger(L, en);
  35     return 3;
  36   }
  37 }
  38
  39
  40 static int os_execute (lua_State *L) {
  41   lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
  42   return 1;
  43 }
  44
  45
  46 static int os_remove (lua_State *L) {
  47   const char *filename = luaL_checkstring(L, 1);
  48   return os_pushresult(L, remove(filename) == 0, filename);
  49 }
  50
  51
  52 static int os_rename (lua_State *L) {
  53   const char *fromname = luaL_checkstring(L, 1);
  54   const char *toname = luaL_checkstring(L, 2);
  55   return os_pushresult(L, rename(fromname, toname) == 0, fromname);
  56 }
  57
  58
  59 static int os_tmpname (lua_State *L) {
  60   char buff[LUA_TMPNAMBUFSIZE];
  61   int err;
  62   lua_tmpnam(buff, err);
  63   if (err)
  64     return luaL_error(L, "unable to generate a unique filename");
  65   lua_pushstring(L, buff);
  66   return 1;
  67 }
  68
  69
  70 static int os_getenv (lua_State *L) {
  71   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  72   return 1;
  73 }
  74
  75
  76 static int os_clock (lua_State *L) {
  77   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  78   return 1;
  79 }
  80
  81
  82 /*
  83 ** {======================================================
  84 ** Time/Date operations
  85 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
  86 **   wday=%w+1, yday=%j, isdst=? }
  87 ** =======================================================
  88 */
  89
  90 static void setfield (lua_State *L, const char *key, int value) {
  91   lua_pushinteger(L, value);
  92   lua_setfield(L, -2, key);
  93 }
  94
  95 static void setboolfield (lua_State *L, const char *key, int value) {
  96   if (value < 0)  /* undefined? */
  97     return;  /* does not set field */
  98   lua_pushboolean(L, value);
  99   lua_setfield(L, -2, key);
 100 }
 101
 102 static int getboolfield (lua_State *L, const char *key) {
 103   int res;
 104   lua_getfield(L, -1, key);
 105   res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
 106   lua_pop(L, 1);
 107   return res;
 108 }
 109
 110
 111 static int getfield (lua_State *L, const char *key, int d) {
 112   int res;
 113   lua_getfield(L, -1, key);
 114   if (lua_isnumber(L, -1))
 115     res = (int)lua_tointeger(L, -1);
 116   else {
 117     if (d < 0)
 118       return luaL_error(L, "field " LUA_QS " missing in date table", key);
 119     res = d;
 120   }
 121   lua_pop(L, 1);
 122   return res;
 123 }
 124
 125
 126 static int os_date (lua_State *L) {
 127   const char *s = luaL_optstring(L, 1, "%c");
 128   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
 129   struct tm *stm;
 130   if (*s == '!') {  /* UTC? */
 131     stm = gmtime(&t);
 132     s++;  /* skip `!' */
 133   }
 134   else
 135     stm = localtime(&t);
 136   if (stm == NULL)  /* invalid date? */
 137     lua_pushnil(L);
 138   else if (strcmp(s, "*t") == 0) {
 139     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 140     setfield(L, "sec", stm->tm_sec);
 141     setfield(L, "min", stm->tm_min);
 142     setfield(L, "hour", stm->tm_hour);
 143     setfield(L, "day", stm->tm_mday);
 144     setfield(L, "month", stm->tm_mon+1);
 145     setfield(L, "year", stm->tm_year+1900);
 146     setfield(L, "wday", stm->tm_wday+1);
 147     setfield(L, "yday", stm->tm_yday+1);
 148     setboolfield(L, "isdst", stm->tm_isdst);
 149   }
 150   else {
 151     char cc[3];
 152     luaL_Buffer b;
 153     cc[0] = '%'; cc[2] = '\0';
 154     luaL_buffinit(L, &b);
 155     for (; *s; s++) {
 156       if (*s != '%' || *(s + 1) == '\0')  /* no conversion specifier? */
 157         luaL_addchar(&b, *s);
 158       else {
 159         size_t reslen;
 160         char buff[200];  /* should be big enough for any conversion result */
 161         cc[1] = *(++s);
 162         reslen = strftime(buff, sizeof(buff), cc, stm);
 163         luaL_addlstring(&b, buff, reslen);
 164       }
 165     }
 166     luaL_pushresult(&b);
 167   }
 168   return 1;
 169 }
 170
 171
 172 static int os_time (lua_State *L) {
 173   time_t t;
 174   if (lua_isnoneornil(L, 1))  /* called without args? */
 175     t = time(NULL);  /* get current time */
 176   else {
 177     struct tm ts;
 178     luaL_checktype(L, 1, LUA_TTABLE);
 179     lua_settop(L, 1);  /* make sure table is at the top */
 180     ts.tm_sec = getfield(L, "sec", 0);
 181     ts.tm_min = getfield(L, "min", 0);
 182     ts.tm_hour = getfield(L, "hour", 12);
 183     ts.tm_mday = getfield(L, "day", -1);
 184     ts.tm_mon = getfield(L, "month", -1) - 1;
 185     ts.tm_year = getfield(L, "year", -1) - 1900;
 186     ts.tm_isdst = getboolfield(L, "isdst");
 187     t = mktime(&ts);
 188   }
 189   if (t == (time_t)(-1))
 190     lua_pushnil(L);
 191   else
 192     lua_pushnumber(L, (lua_Number)t);
 193   return 1;
 194 }
 195
 196
 197 static int os_difftime (lua_State *L) {
 198   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
 199                              (time_t)(luaL_optnumber(L, 2, 0))));
 200   return 1;
 201 }
 202
 203 /* }====================================================== */
 204
 205
 206 static int os_setlocale (lua_State *L) {
 207   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
 208                       LC_NUMERIC, LC_TIME};
 209   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
 210      "numeric", "time", NULL};
 211   const char *l = luaL_optstring(L, 1, NULL);
 212   int op = luaL_checkoption(L, 2, "all", catnames);
 213   lua_pushstring(L, setlocale(cat[op], l));
 214   return 1;
 215 }
 216
 217
 218 static int os_exit (lua_State *L) {
 219   exit(luaL_optint(L, 1, EXIT_SUCCESS));
 220 }
 221
 222 static const luaL_Reg syslib[] = {
 223   {"clock",     os_clock},
 224   {"date",      os_date},
 225   {"difftime",  os_difftime},
 226   {"execute",   os_execute},
 227   {"exit",      os_exit},
 228   {"getenv",    os_getenv},
 229   {"remove",    os_remove},
 230   {"rename",    os_rename},
 231   {"setlocale", os_setlocale},
 232   {"time",      os_time},
 233   {"tmpname",   os_tmpname},
 234   {NULL, NULL}
 235 };
 236
 237 /* }====================================================== */
 238
 239
 240
 241 LUALIB_API int luaopen_os (lua_State *L) {
 242   luaL_register(L, LUA_OSLIBNAME, syslib);
 243   return 1;
 244 }
 245