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  1. /*
  2. ** $Id: loslib.c,v 1.38 2011/11/30 12:35:05 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. /*
  24. ** list of valid conversion specifiers for the 'strftime' function
  25. */
  26. #if !defined(LUA_STRFTIMEOPTIONS)
  27.  
  28. #if !defined(LUA_USE_POSIX)
  29. #define LUA_STRFTIMEOPTIONS     { "aAbBcdHIjmMpSUwWxXyYz%", "" }
  30. #else
  31. #define LUA_STRFTIMEOPTIONS     { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "", \
  32.                                 "E", "cCxXyY",  \
  33.                                 "O", "deHImMSuUVwWy" }
  34. #endif
  35.  
  36. #endif
  37.  
  38.  
  39.  
  40. /*
  41. ** By default, Lua uses tmpnam except when POSIX is available, where it
  42. ** uses mkstemp.
  43. */
  44. #if defined(LUA_USE_MKSTEMP)
  45. #include <unistd.h>
  46. #define LUA_TMPNAMBUFSIZE       32
  47. #define lua_tmpnam(b,e) { \
  48.         strcpy(b, "/tmp/lua_XXXXXX"); \
  49.         e = mkstemp(b); \
  50.         if (e != -1) close(e); \
  51.         e = (e == -1); }
  52.  
  53. #elif !defined(lua_tmpnam)
  54.  
  55. #define LUA_TMPNAMBUFSIZE       L_tmpnam
  56. #define lua_tmpnam(b,e)         { e = (tmpnam(b) == NULL); }
  57.  
  58. #endif
  59.  
  60.  
  61. /*
  62. ** By default, Lua uses gmtime/localtime, except when POSIX is available,
  63. ** where it uses gmtime_r/localtime_r
  64. */
  65. #if defined(LUA_USE_GMTIME_R)
  66.  
  67. #define l_gmtime(t,r)           gmtime_r(t,r)
  68. #define l_localtime(t,r)        localtime_r(t,r)
  69.  
  70. #elif !defined(l_gmtime)
  71.  
  72. #define l_gmtime(t,r)           ((void)r, gmtime(t))
  73. #define l_localtime(t,r)        ((void)r, localtime(t))
  74.  
  75. #endif
  76.  
  77.  
  78.  
  79. static int os_execute (lua_State *L) {
  80.   const char *cmd = luaL_optstring(L, 1, NULL);
  81.   int stat = system(cmd);
  82.   if (cmd != NULL)
  83.     return luaL_execresult(L, stat);
  84.   else {
  85.     lua_pushboolean(L, stat);  /* true if there is a shell */
  86.     return 1;
  87.   }
  88. }
  89.  
  90.  
  91. static int os_remove (lua_State *L) {
  92.   const char *filename = luaL_checkstring(L, 1);
  93.   return luaL_fileresult(L, remove(filename) == 0, filename);
  94. }
  95.  
  96.  
  97. static int os_rename (lua_State *L) {
  98.   const char *fromname = luaL_checkstring(L, 1);
  99.   const char *toname = luaL_checkstring(L, 2);
  100.   return luaL_fileresult(L, rename(fromname, toname) == 0, fromname);
  101. }
  102.  
  103.  
  104. static int os_tmpname (lua_State *L) {
  105.   char buff[LUA_TMPNAMBUFSIZE];
  106.   int err;
  107.   lua_tmpnam(buff, err);
  108.   if (err)
  109.     return luaL_error(L, "unable to generate a unique filename");
  110.   lua_pushstring(L, buff);
  111.   return 1;
  112. }
  113.  
  114.  
  115. static int os_getenv (lua_State *L) {
  116.   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  117.   return 1;
  118. }
  119.  
  120.  
  121. static int os_clock (lua_State *L) {
  122.   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  123.   return 1;
  124. }
  125.  
  126.  
  127. /*
  128. ** {======================================================
  129. ** Time/Date operations
  130. ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
  131. **   wday=%w+1, yday=%j, isdst=? }
  132. ** =======================================================
  133. */
  134.  
  135. static void setfield (lua_State *L, const char *key, int value) {
  136.   lua_pushinteger(L, value);
  137.   lua_setfield(L, -2, key);
  138. }
  139.  
  140. static void setboolfield (lua_State *L, const char *key, int value) {
  141.   if (value < 0)  /* undefined? */
  142.     return;  /* does not set field */
  143.   lua_pushboolean(L, value);
  144.   lua_setfield(L, -2, key);
  145. }
  146.  
  147. static int getboolfield (lua_State *L, const char *key) {
  148.   int res;
  149.   lua_getfield(L, -1, key);
  150.   res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
  151.   lua_pop(L, 1);
  152.   return res;
  153. }
  154.  
  155.  
  156. static int getfield (lua_State *L, const char *key, int d) {
  157.   int res, isnum;
  158.   lua_getfield(L, -1, key);
  159.   res = (int)lua_tointegerx(L, -1, &isnum);
  160.   if (!isnum) {
  161.     if (d < 0)
  162.       return luaL_error(L, "field " LUA_QS " missing in date table", key);
  163.     res = d;
  164.   }
  165.   lua_pop(L, 1);
  166.   return res;
  167. }
  168.  
  169.  
  170. static const char *checkoption (lua_State *L, const char *conv, char *buff) {
  171.   static const char *const options[] = LUA_STRFTIMEOPTIONS;
  172.   unsigned int i;
  173.   for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
  174.     if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
  175.       buff[1] = *conv;
  176.       if (*options[i + 1] == '\0') {  /* one-char conversion specifier? */
  177.         buff[2] = '\0';  /* end buffer */
  178.         return conv + 1;
  179.       }
  180.       else if (*(conv + 1) != '\0' &&
  181.                strchr(options[i + 1], *(conv + 1)) != NULL) {
  182.         buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
  183.         buff[3] = '\0';  /* end buffer */
  184.         return conv + 2;
  185.       }
  186.     }
  187.   }
  188.   luaL_argerror(L, 1,
  189.     lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
  190.   return conv;  /* to avoid warnings */
  191. }
  192.  
  193.  
  194. static int os_date (lua_State *L) {
  195.   const char *s = luaL_optstring(L, 1, "%c");
  196.   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
  197.   struct tm tmr, *stm;
  198.   if (*s == '!') {  /* UTC? */
  199.     stm = l_gmtime(&t, &tmr);
  200.     s++;  /* skip `!' */
  201.   }
  202.   else
  203.     stm = l_localtime(&t, &tmr);
  204.   if (stm == NULL)  /* invalid date? */
  205.     lua_pushnil(L);
  206.   else if (strcmp(s, "*t") == 0) {
  207.     lua_createtable(L, 0, 9);  /* 9 = number of fields */
  208.     setfield(L, "sec", stm->tm_sec);
  209.     setfield(L, "min", stm->tm_min);
  210.     setfield(L, "hour", stm->tm_hour);
  211.     setfield(L, "day", stm->tm_mday);
  212.     setfield(L, "month", stm->tm_mon+1);
  213.     setfield(L, "year", stm->tm_year+1900);
  214.     setfield(L, "wday", stm->tm_wday+1);
  215.     setfield(L, "yday", stm->tm_yday+1);
  216.     setboolfield(L, "isdst", stm->tm_isdst);
  217.   }
  218.   else {
  219.     char cc[4];
  220.     luaL_Buffer b;
  221.     cc[0] = '%';
  222.     luaL_buffinit(L, &b);
  223.     while (*s) {
  224.       if (*s != '%')  /* no conversion specifier? */
  225.         luaL_addchar(&b, *s++);
  226.       else {
  227.         size_t reslen;
  228.         char buff[200];  /* should be big enough for any conversion result */
  229.         s = checkoption(L, s + 1, cc);
  230.         reslen = strftime(buff, sizeof(buff), cc, stm);
  231.         luaL_addlstring(&b, buff, reslen);
  232.       }
  233.     }
  234.     luaL_pushresult(&b);
  235.   }
  236.   return 1;
  237. }
  238.  
  239.  
  240. static int os_time (lua_State *L) {
  241.   time_t t;
  242.   if (lua_isnoneornil(L, 1))  /* called without args? */
  243.     t = time(NULL);  /* get current time */
  244.   else {
  245.     struct tm ts;
  246.     luaL_checktype(L, 1, LUA_TTABLE);
  247.     lua_settop(L, 1);  /* make sure table is at the top */
  248.     ts.tm_sec = getfield(L, "sec", 0);
  249.     ts.tm_min = getfield(L, "min", 0);
  250.     ts.tm_hour = getfield(L, "hour", 12);
  251.     ts.tm_mday = getfield(L, "day", -1);
  252.     ts.tm_mon = getfield(L, "month", -1) - 1;
  253.     ts.tm_year = getfield(L, "year", -1) - 1900;
  254.     ts.tm_isdst = getboolfield(L, "isdst");
  255.     t = mktime(&ts);
  256.   }
  257.   if (t == (time_t)(-1))
  258.     lua_pushnil(L);
  259.   else
  260.     lua_pushnumber(L, (lua_Number)t);
  261.   return 1;
  262. }
  263.  
  264.  
  265. static int os_difftime (lua_State *L) {
  266.   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
  267.                              (time_t)(luaL_optnumber(L, 2, 0))));
  268.   return 1;
  269. }
  270.  
  271. /* }====================================================== */
  272.  
  273.  
  274. static int os_setlocale (lua_State *L) {
  275.   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
  276.                       LC_NUMERIC, LC_TIME};
  277.   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
  278.      "numeric", "time", NULL};
  279.   const char *l = luaL_optstring(L, 1, NULL);
  280.   int op = luaL_checkoption(L, 2, "all", catnames);
  281.   lua_pushstring(L, setlocale(cat[op], l));
  282.   return 1;
  283. }
  284.  
  285.  
  286. static int os_exit (lua_State *L) {
  287.   int status;
  288.   if (lua_isboolean(L, 1))
  289.     status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
  290.   else
  291.     status = luaL_optint(L, 1, EXIT_SUCCESS);
  292.   if (lua_toboolean(L, 2))
  293.     lua_close(L);
  294.   if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
  295.   return 0;
  296. }
  297.  
  298.  
  299. static const luaL_Reg syslib[] = {
  300.   {"clock",     os_clock},
  301.   {"date",      os_date},
  302.   {"difftime",  os_difftime},
  303.   {"execute",   os_execute},
  304.   {"exit",      os_exit},
  305.   {"getenv",    os_getenv},
  306.   {"remove",    os_remove},
  307.   {"rename",    os_rename},
  308.   {"setlocale", os_setlocale},
  309.   {"time",      os_time},
  310.   {"tmpname",   os_tmpname},
  311.   {NULL, NULL}
  312. };
  313.  
  314. /* }====================================================== */
  315.  
  316.  
  317.  
  318. LUAMOD_API int luaopen_os (lua_State *L) {
  319.   luaL_newlib(L, syslib);
  320.   return 1;
  321. }
  322.  
  323.