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  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.  
  244.