com32/lua/src/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 #ifdef SYSLINUX
  70   lua_pushstring(L, NULL);  /* if NULL push nil */
  71 #else
  72   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  73 #endif
  74   return 1;
  75 }
  76
  77
  78 static int os_clock (lua_State *L) {
  79   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  80   return 1;
  81 }
  82
  83
  84 /*
  85 ** {======================================================
  86 ** Time/Date operations
  87 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
  88 **   wday=%w+1, yday=%j, isdst=? }
  89 ** =======================================================
  90 */
  91
  92 static void setfield (lua_State *L, const char *key, int value) {
  93   lua_pushinteger(L, value);
  94   lua_setfield(L, -2, key);
  95 }
  96
  97 static void setboolfield (lua_State *L, const char *key, int value) {
  98   if (value < 0)  /* undefined? */
  99     return;  /* does not set field */
 100   lua_pushboolean(L, value);
 101   lua_setfield(L, -2, key);
 102 }
 103
 104 static int getboolfield (lua_State *L, const char *key) {
 105   int res;
 106   lua_getfield(L, -1, key);
 107   res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
 108   lua_pop(L, 1);
 109   return res;
 110 }
 111
 112
 113 static int getfield (lua_State *L, const char *key, int d) {
 114   int res;
 115   lua_getfield(L, -1, key);
 116   if (lua_isnumber(L, -1))
 117     res = (int)lua_tointeger(L, -1);
 118   else {
 119     if (d < 0)
 120       return luaL_error(L, "field " LUA_QS " missing in date table", key);
 121     res = d;
 122   }
 123   lua_pop(L, 1);
 124   return res;
 125 }
 126
 127
 128 static int os_date (lua_State *L) {
 129   const char *s = luaL_optstring(L, 1, "%c");
 130   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
 131   struct tm *stm;
 132   if (*s == '!') {  /* UTC? */
 133     stm = gmtime(&t);
 134     s++;  /* skip `!' */
 135   }
 136   else
 137     stm = localtime(&t);
 138   if (stm == NULL)  /* invalid date? */
 139     lua_pushnil(L);
 140   else if (strcmp(s, "*t") == 0) {
 141     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 142     setfield(L, "sec", stm->tm_sec);
 143     setfield(L, "min", stm->tm_min);
 144     setfield(L, "hour", stm->tm_hour);
 145     setfield(L, "day", stm->tm_mday);
 146     setfield(L, "month", stm->tm_mon+1);
 147     setfield(L, "year", stm->tm_year+1900);
 148     setfield(L, "wday", stm->tm_wday+1);
 149     setfield(L, "yday", stm->tm_yday+1);
 150     setboolfield(L, "isdst", stm->tm_isdst);
 151   }
 152   else {
 153     char cc[3];
 154     luaL_Buffer b;
 155     cc[0] = '%'; cc[2] = '\0';
 156     luaL_buffinit(L, &b);
 157     for (; *s; s++) {
 158       if (*s != '%' || *(s + 1) == '\0')  /* no conversion specifier? */
 159         luaL_addchar(&b, *s);
 160       else {
 161         size_t reslen;
 162         char buff[200];  /* should be big enough for any conversion result */
 163         cc[1] = *(++s);
 164         reslen = strftime(buff, sizeof(buff), cc, stm);
 165         luaL_addlstring(&b, buff, reslen);
 166       }
 167     }
 168     luaL_pushresult(&b);
 169   }
 170   return 1;
 171 }
 172
 173
 174 static int os_time (lua_State *L) {
 175   time_t t;
 176   if (lua_isnoneornil(L, 1))  /* called without args? */
 177     t = time(NULL);  /* get current time */
 178   else {
 179     struct tm ts;
 180     luaL_checktype(L, 1, LUA_TTABLE);
 181     lua_settop(L, 1);  /* make sure table is at the top */
 182     ts.tm_sec = getfield(L, "sec", 0);
 183     ts.tm_min = getfield(L, "min", 0);
 184     ts.tm_hour = getfield(L, "hour", 12);
 185     ts.tm_mday = getfield(L, "day", -1);
 186     ts.tm_mon = getfield(L, "month", -1) - 1;
 187     ts.tm_year = getfield(L, "year", -1) - 1900;
 188     ts.tm_isdst = getboolfield(L, "isdst");
 189     t = mktime(&ts);
 190   }
 191   if (t == (time_t)(-1))
 192     lua_pushnil(L);
 193   else
 194     lua_pushnumber(L, (lua_Number)t);
 195   return 1;
 196 }
 197
 198
 199 #if !defined LUA_NUMBER_INTEGRAL
 200 static int os_difftime (lua_State *L) {
 201   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
 202                              (time_t)(luaL_optnumber(L, 2, 0))));
 203   return 1;
 204 }
 205 #endif
 206
 207 /* }====================================================== */
 208
 209
 210 static int os_setlocale (lua_State *L) {
 211   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
 212                       LC_NUMERIC, LC_TIME};
 213   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
 214      "numeric", "time", NULL};
 215   const char *l = luaL_optstring(L, 1, NULL);
 216   int op = luaL_checkoption(L, 2, "all", catnames);
 217   lua_pushstring(L, setlocale(cat[op], l));
 218   return 1;
 219 }
 220
 221
 222 static int os_exit (lua_State *L) {
 223   exit(luaL_optint(L, 1, EXIT_SUCCESS));
 224 }
 225
 226 static const luaL_Reg syslib[] = {
 227   {"clock",     os_clock},
 228   {"date",      os_date},
 229 #if !defined LUA_NUMBER_INTEGRAL
 230   {"difftime",  os_difftime},
 231 #endif
 232   {"execute",   os_execute},
 233   {"exit",      os_exit},
 234   {"getenv",    os_getenv},
 235   {"remove",    os_remove},
 236   {"rename",    os_rename},
 237   {"setlocale", os_setlocale},
 238   {"time",      os_time},
 239   {"tmpname",   os_tmpname},
 240   {NULL, NULL}
 241 };
 242
 243 /* }====================================================== */
 244
 245
 246
 247 LUALIB_API int luaopen_os (lua_State *L) {
 248   luaL_register(L, LUA_OSLIBNAME, syslib);
 249   return 1;
 250 }
 251