loslib.c

   1 /*
   2 ** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $
   3 ** Standard Operating System library
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7
   8 #include <errno.h>
   9 #include <locale.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <time.h>
  13
  14 #define loslib_c
  15 #define LUA_LIB
  16
  17 #include "lua.h"
  18
  19 #include "lauxlib.h"
  20 #include "lualib.h"
  21
  22
  23 static int os_pushresult (lua_State *L, int i, const char *filename) {
  24   int en = errno;  /* calls to Lua API may change this value */
  25   if (i) {
  26     lua_pushboolean(L, 1);
  27     return 1;
  28   }
  29   else {
  30     lua_pushnil(L);
  31     lua_pushfstring(L, "%s: %s", filename, strerror(en));
  32     lua_pushinteger(L, en);
  33     return 3;
  34   }
  35 }
  36
  37
  38 static int os_execute (lua_State *L) {
  39   lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
  40   return 1;
  41 }
  42
  43
  44 static int os_remove (lua_State *L) {
  45   const char *filename = luaL_checkstring(L, 1);
  46   return os_pushresult(L, remove(filename) == 0, filename);
  47 }
  48
  49
  50 static int os_rename (lua_State *L) {
  51   const char *fromname = luaL_checkstring(L, 1);
  52   const char *toname = luaL_checkstring(L, 2);
  53   return os_pushresult(L, rename(fromname, toname) == 0, fromname);
  54 }
  55
  56
  57 static int os_tmpname (lua_State *L) {
  58   char buff[LUA_TMPNAMBUFSIZE];
  59   int err;
  60   lua_tmpnam(buff, err);
  61   if (err)
  62     return luaL_error(L, "unable to generate a unique filename");
  63   lua_pushstring(L, buff);
  64   return 1;
  65 }
  66
  67
  68 static int os_getenv (lua_State *L) {
  69   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  70   return 1;
  71 }
  72
  73
  74 static int os_clock (lua_State *L) {
  75   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  76   return 1;
  77 }
  78
  79
  80 /*
  81 ** {======================================================
  82 ** Time/Date operations
  83 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
  84 **   wday=%w+1, yday=%j, isdst=? }
  85 ** =======================================================
  86 */
  87
  88 static void setfield (lua_State *L, const char *key, int value) {
  89   lua_pushinteger(L, value);
  90   lua_setfield(L, -2, key);
  91 }
  92
  93 static void setboolfield (lua_State *L, const char *key, int value) {
  94   if (value < 0)  /* undefined? */
  95     return;  /* does not set field */
  96   lua_pushboolean(L, value);
  97   lua_setfield(L, -2, key);
  98 }
  99
 100 static int getboolfield (lua_State *L, const char *key) {
 101   int res;
 102   lua_getfield(L, -1, key);
 103   res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
 104   lua_pop(L, 1);
 105   return res;
 106 }
 107
 108
 109 static int getfield (lua_State *L, const char *key, int d) {
 110   int res;
 111   lua_getfield(L, -1, key);
 112   if (lua_isnumber(L, -1))
 113     res = (int)lua_tointeger(L, -1);
 114   else {
 115     if (d < 0)
 116       return luaL_error(L, "field " LUA_QS " missing in date table", key);
 117     res = d;
 118   }
 119   lua_pop(L, 1);
 120   return res;
 121 }
 122
 123
 124 static int os_date (lua_State *L) {
 125   const char *s = luaL_optstring(L, 1, "%c");
 126   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
 127   struct tm *stm;
 128   if (*s == '!') {  /* UTC? */
 129     stm = gmtime(&t);
 130     s++;  /* skip `!' */
 131   }
 132   else
 133     stm = localtime(&t);
 134   if (stm == NULL)  /* invalid date? */
 135     lua_pushnil(L);
 136   else if (strcmp(s, "*t") == 0) {
 137     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 138     setfield(L, "sec", stm->tm_sec);
 139     setfield(L, "min", stm->tm_min);
 140     setfield(L, "hour", stm->tm_hour);
 141     setfield(L, "day", stm->tm_mday);
 142     setfield(L, "month", stm->tm_mon+1);
 143     setfield(L, "year", stm->tm_year+1900);
 144     setfield(L, "wday", stm->tm_wday+1);
 145     setfield(L, "yday", stm->tm_yday+1);
 146     setboolfield(L, "isdst", stm->tm_isdst);
 147   }
 148   else {
 149     char cc[3];
 150     luaL_Buffer b;
 151     cc[0] = '%'; cc[2] = '\0';
 152     luaL_buffinit(L, &b);
 153     for (; *s; s++) {
 154       if (*s != '%' || *(s + 1) == '\0')  /* no conversion specifier? */
 155         luaL_addchar(&b, *s);
 156       else {
 157         size_t reslen;
 158         char buff[200];  /* should be big enough for any conversion result */
 159         cc[1] = *(++s);
 160         reslen = strftime(buff, sizeof(buff), cc, stm);
 161         luaL_addlstring(&b, buff, reslen);
 162       }
 163     }
 164     luaL_pushresult(&b);
 165   }
 166   return 1;
 167 }
 168
 169
 170 static int os_time (lua_State *L) {
 171   time_t t;
 172   if (lua_isnoneornil(L, 1))  /* called without args? */
 173     t = time(NULL);  /* get current time */
 174   else {
 175     struct tm ts;
 176     luaL_checktype(L, 1, LUA_TTABLE);
 177     lua_settop(L, 1);  /* make sure table is at the top */
 178     ts.tm_sec = getfield(L, "sec", 0);
 179     ts.tm_min = getfield(L, "min", 0);
 180     ts.tm_hour = getfield(L, "hour", 12);
 181     ts.tm_mday = getfield(L, "day", -1);
 182     ts.tm_mon = getfield(L, "month", -1) - 1;
 183     ts.tm_year = getfield(L, "year", -1) - 1900;
 184     ts.tm_isdst = getboolfield(L, "isdst");
 185     t = mktime(&ts);
 186   }
 187   if (t == (time_t)(-1))
 188     lua_pushnil(L);
 189   else
 190     lua_pushnumber(L, (lua_Number)t);
 191   return 1;
 192 }
 193
 194
 195 static int os_difftime (lua_State *L) {
 196   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
 197                              (time_t)(luaL_optnumber(L, 2, 0))));
 198   return 1;
 199 }
 200
 201 /* }====================================================== */
 202
 203
 204 static int os_setlocale (lua_State *L) {
 205   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
 206                       LC_NUMERIC, LC_TIME};
 207   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
 208      "numeric", "time", NULL};
 209   const char *l = luaL_optstring(L, 1, NULL);
 210   int op = luaL_checkoption(L, 2, "all", catnames);
 211   lua_pushstring(L, setlocale(cat[op], l));
 212   return 1;
 213 }
 214
 215
 216 static int os_exit (lua_State *L) {
 217   exit(luaL_optint(L, 1, EXIT_SUCCESS));
 218 }
 219
 220 static const luaL_Reg syslib[] = {
 221   {"clock",     os_clock},
 222   {"date",      os_date},
 223   {"difftime",  os_difftime},
 224   {"execute",   os_execute},
 225   {"exit",      os_exit},
 226   {"getenv",    os_getenv},
 227   {"remove",    os_remove},
 228   {"rename",    os_rename},
 229   {"setlocale", os_setlocale},
 230   {"time",      os_time},
 231   {"tmpname",   os_tmpname},
 232   {NULL, NULL}
 233 };
 234
 235 /* }====================================================== */
 236
 237
 238
 239 LUALIB_API int luaopen_os (lua_State *L) {
 240   luaL_register(L, LUA_OSLIBNAME, syslib);
 241   return 1;
 242 }
 243