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  1. /*
  2. ** $Id: loslib.c,v 1.40.1.1 2013/04/12 18:48:47 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 \
  32.         { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "" \
  33.           "", "E", "cCxXyY",  \
  34.           "O", "deHImMSuUVwWy" }
  35. #endif
  36.  
  37. #endif
  38.  
  39.  
  40.  
  41. /*
  42. ** By default, Lua uses tmpnam except when POSIX is available, where it
  43. ** uses mkstemp.
  44. */
  45. #if defined(LUA_USE_MKSTEMP)
  46. #include <unistd.h>
  47. #define LUA_TMPNAMBUFSIZE       32
  48. #define lua_tmpnam(b,e) { \
  49.         strcpy(b, "/tmp/lua_XXXXXX"); \
  50.         e = mkstemp(b); \
  51.         if (e != -1) close(e); \
  52.         e = (e == -1); }
  53.  
  54. #elif !defined(lua_tmpnam)
  55.  
  56. #define LUA_TMPNAMBUFSIZE       L_tmpnam
  57. #define lua_tmpnam(b,e)         { e = (tmpnam(b) == NULL); }
  58.  
  59. #endif
  60.  
  61.  
  62. /*
  63. ** By default, Lua uses gmtime/localtime, except when POSIX is available,
  64. ** where it uses gmtime_r/localtime_r
  65. */
  66. #if defined(LUA_USE_GMTIME_R)
  67.  
  68. #define l_gmtime(t,r)           gmtime_r(t,r)
  69. #define l_localtime(t,r)        localtime_r(t,r)
  70.  
  71. #elif !defined(l_gmtime)
  72.  
  73. #define l_gmtime(t,r)           ((void)r, gmtime(t))
  74. #define l_localtime(t,r)        ((void)r, localtime(t))
  75.  
  76. #endif
  77.  
  78.  
  79.  
  80. static int os_execute (lua_State *L) {
  81.   const char *cmd = luaL_optstring(L, 1, NULL);
  82.   int stat = system(cmd);
  83.   if (cmd != NULL)
  84.     return luaL_execresult(L, stat);
  85.   else {
  86.     lua_pushboolean(L, stat);  /* true if there is a shell */
  87.     return 1;
  88.   }
  89. }
  90.  
  91.  
  92. static int os_remove (lua_State *L) {
  93.   const char *filename = luaL_checkstring(L, 1);
  94.   return luaL_fileresult(L, remove(filename) == 0, filename);
  95. }
  96.  
  97.  
  98. static int os_rename (lua_State *L) {
  99.   const char *fromname = luaL_checkstring(L, 1);
  100.   const char *toname = luaL_checkstring(L, 2);
  101.   return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
  102. }
  103.  
  104.  
  105. static int os_tmpname (lua_State *L) {
  106.   char buff[LUA_TMPNAMBUFSIZE];
  107.   int err;
  108.   lua_tmpnam(buff, err);
  109.   if (err)
  110.     return luaL_error(L, "unable to generate a unique filename");
  111.   lua_pushstring(L, buff);
  112.   return 1;
  113. }
  114.  
  115.  
  116. static int os_getenv (lua_State *L) {
  117.   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  118.   return 1;
  119. }
  120.  
  121.  
  122. static int os_clock (lua_State *L) {
  123.   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  124.   return 1;
  125. }
  126.  
  127.  
  128. /*
  129. ** {======================================================
  130. ** Time/Date operations
  131. ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
  132. **   wday=%w+1, yday=%j, isdst=? }
  133. ** =======================================================
  134. */
  135.  
  136. static void setfield (lua_State *L, const char *key, int value) {
  137.   lua_pushinteger(L, value);
  138.   lua_setfield(L, -2, key);
  139. }
  140.  
  141. static void setboolfield (lua_State *L, const char *key, int value) {
  142.   if (value < 0)  /* undefined? */
  143.     return;  /* does not set field */
  144.   lua_pushboolean(L, value);
  145.   lua_setfield(L, -2, key);
  146. }
  147.  
  148. static int getboolfield (lua_State *L, const char *key) {
  149.   int res;
  150.   lua_getfield(L, -1, key);
  151.   res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
  152.   lua_pop(L, 1);
  153.   return res;
  154. }
  155.  
  156.  
  157. static int getfield (lua_State *L, const char *key, int d) {
  158.   int res, isnum;
  159.   lua_getfield(L, -1, key);
  160.   res = (int)lua_tointegerx(L, -1, &isnum);
  161.   if (!isnum) {
  162.     if (d < 0)
  163.       return luaL_error(L, "field " LUA_QS " missing in date table", key);
  164.     res = d;
  165.   }
  166.   lua_pop(L, 1);
  167.   return res;
  168. }
  169.  
  170.  
  171. static const char *checkoption (lua_State *L, const char *conv, char *buff) {
  172.   static const char *const options[] = LUA_STRFTIMEOPTIONS;
  173.   unsigned int i;
  174.   for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
  175.     if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
  176.       buff[1] = *conv;
  177.       if (*options[i + 1] == '\0') {  /* one-char conversion specifier? */
  178.         buff[2] = '\0';  /* end buffer */
  179.         return conv + 1;
  180.       }
  181.       else if (*(conv + 1) != '\0' &&
  182.                strchr(options[i + 1], *(conv + 1)) != NULL) {
  183.         buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
  184.         buff[3] = '\0';  /* end buffer */
  185.         return conv + 2;
  186.       }
  187.     }
  188.   }
  189.   luaL_argerror(L, 1,
  190.     lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
  191.   return conv;  /* to avoid warnings */
  192. }
  193.  
  194.  
  195. static int os_date (lua_State *L) {
  196.   const char *s = luaL_optstring(L, 1, "%c");
  197.   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
  198.   struct tm tmr, *stm;
  199.   if (*s == '!') {  /* UTC? */
  200.     stm = l_gmtime(&t, &tmr);
  201.     s++;  /* skip `!' */
  202.   }
  203.   else
  204.     stm = l_localtime(&t, &tmr);
  205.   if (stm == NULL)  /* invalid date? */
  206.     lua_pushnil(L);
  207.   else if (strcmp(s, "*t") == 0) {
  208.     lua_createtable(L, 0, 9);  /* 9 = number of fields */
  209.     setfield(L, "sec", stm->tm_sec);
  210.     setfield(L, "min", stm->tm_min);
  211.     setfield(L, "hour", stm->tm_hour);
  212.     setfield(L, "day", stm->tm_mday);
  213.     setfield(L, "month", stm->tm_mon+1);
  214.     setfield(L, "year", stm->tm_year+1900);
  215.     setfield(L, "wday", stm->tm_wday+1);
  216.     setfield(L, "yday", stm->tm_yday+1);
  217.     setboolfield(L, "isdst", stm->tm_isdst);
  218.   }
  219.   else {
  220.     char cc[4];
  221.     luaL_Buffer b;
  222.     cc[0] = '%';
  223.     luaL_buffinit(L, &b);
  224.     while (*s) {
  225.       if (*s != '%')  /* no conversion specifier? */
  226.         luaL_addchar(&b, *s++);
  227.       else {
  228.         size_t reslen;
  229.         char buff[200];  /* should be big enough for any conversion result */
  230.         s = checkoption(L, s + 1, cc);
  231.         reslen = strftime(buff, sizeof(buff), cc, stm);
  232.         luaL_addlstring(&b, buff, reslen);
  233.       }
  234.     }
  235.     luaL_pushresult(&b);
  236.   }
  237.   return 1;
  238. }
  239.  
  240.  
  241. static int os_time (lua_State *L) {
  242.   time_t t;
  243.   if (lua_isnoneornil(L, 1))  /* called without args? */
  244.     t = time(NULL);  /* get current time */
  245.   else {
  246.     struct tm ts;
  247.     luaL_checktype(L, 1, LUA_TTABLE);
  248.     lua_settop(L, 1);  /* make sure table is at the top */
  249.     ts.tm_sec = getfield(L, "sec", 0);
  250.     ts.tm_min = getfield(L, "min", 0);
  251.     ts.tm_hour = getfield(L, "hour", 12);
  252.     ts.tm_mday = getfield(L, "day", -1);
  253.     ts.tm_mon = getfield(L, "month", -1) - 1;
  254.     ts.tm_year = getfield(L, "year", -1) - 1900;
  255.     ts.tm_isdst = getboolfield(L, "isdst");
  256.     t = mktime(&ts);
  257.   }
  258.   if (t == (time_t)(-1))
  259.     lua_pushnil(L);
  260.   else
  261.     lua_pushnumber(L, (lua_Number)t);
  262.   return 1;
  263. }
  264.  
  265.  
  266. static int os_difftime (lua_State *L) {
  267.   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
  268.                              (time_t)(luaL_optnumber(L, 2, 0))));
  269.   return 1;
  270. }
  271.  
  272. /* }====================================================== */
  273.  
  274.  
  275. static int os_setlocale (lua_State *L) {
  276.   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
  277.                       LC_NUMERIC, LC_TIME};
  278.   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
  279.      "numeric", "time", NULL};
  280.   const char *l = luaL_optstring(L, 1, NULL);
  281.   int op = luaL_checkoption(L, 2, "all", catnames);
  282.   lua_pushstring(L, setlocale(cat[op], l));
  283.   return 1;
  284. }
  285.  
  286.  
  287. static int os_exit (lua_State *L) {
  288.   int status;
  289.   if (lua_isboolean(L, 1))
  290.     status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
  291.   else
  292.     status = luaL_optint(L, 1, EXIT_SUCCESS);
  293.   if (lua_toboolean(L, 2))
  294.     lua_close(L);
  295.   if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
  296.   return 0;
  297. }
  298.  
  299.  
  300. static const luaL_Reg syslib[] = {
  301.   {"clock",     os_clock},
  302.   {"date",      os_date},
  303.   {"difftime",  os_difftime},
  304.   {"execute",   os_execute},
  305.   {"exit",      os_exit},
  306.   {"getenv",    os_getenv},
  307.   {"remove",    os_remove},
  308.   {"rename",    os_rename},
  309.   {"setlocale", os_setlocale},
  310.   {"time",      os_time},
  311.   {"tmpname",   os_tmpname},
  312.   {NULL, NULL}
  313. };
  314.  
  315. /* }====================================================== */
  316.  
  317.  
  318.  
  319. LUAMOD_API int luaopen_os (lua_State *L) {
  320.   luaL_newlib(L, syslib);
  321.   return 1;
  322. }
  323.  
  324.