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  1. /*
  2. ** $Id: loslib.c $
  3. ** Standard Operating System library
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7. #define loslib_c
  8. #define LUA_LIB
  9.  
  10. #include "lprefix.h"
  11.  
  12.  
  13. #include <errno.h>
  14. #include <locale.h>
  15. #include <stdlib.h>
  16. #include <string.h>
  17. #include <time.h>
  18.  
  19. #include "lua.h"
  20.  
  21. #include "lauxlib.h"
  22. #include "lualib.h"
  23.  
  24.  
  25. /*
  26. ** {==================================================================
  27. ** List of valid conversion specifiers for the 'strftime' function;
  28. ** options are grouped by length; group of length 2 start with '||'.
  29. ** ===================================================================
  30. */
  31. #if !defined(LUA_STRFTIMEOPTIONS)       /* { */
  32.  
  33. /* options for ANSI C 89 (only 1-char options) */
  34. #define L_STRFTIMEC89           "aAbBcdHIjmMpSUwWxXyYZ%"
  35.  
  36. /* options for ISO C 99 and POSIX */
  37. #define L_STRFTIMEC99 "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%" \
  38.     "||" "EcECExEXEyEY" "OdOeOHOIOmOMOSOuOUOVOwOWOy"  /* two-char options */
  39.  
  40. /* options for Windows */
  41. #define L_STRFTIMEWIN "aAbBcdHIjmMpSUwWxXyYzZ%" \
  42.     "||" "#c#x#d#H#I#j#m#M#S#U#w#W#y#Y"  /* two-char options */
  43.  
  44. #if defined(LUA_USE_WINDOWS)
  45. #define LUA_STRFTIMEOPTIONS     L_STRFTIMEWIN
  46. #elif defined(LUA_USE_C89)
  47. #define LUA_STRFTIMEOPTIONS     L_STRFTIMEC89
  48. #else  /* C99 specification */
  49. #define LUA_STRFTIMEOPTIONS     L_STRFTIMEC99
  50. #endif
  51.  
  52. #endif                                  /* } */
  53. /* }================================================================== */
  54.  
  55.  
  56. /*
  57. ** {==================================================================
  58. ** Configuration for time-related stuff
  59. ** ===================================================================
  60. */
  61.  
  62. /*
  63. ** type to represent time_t in Lua
  64. */
  65. #if !defined(LUA_NUMTIME)       /* { */
  66.  
  67. #define l_timet                 lua_Integer
  68. #define l_pushtime(L,t)         lua_pushinteger(L,(lua_Integer)(t))
  69. #define l_gettime(L,arg)        luaL_checkinteger(L, arg)
  70.  
  71. #else                           /* }{ */
  72.  
  73. #define l_timet                 lua_Number
  74. #define l_pushtime(L,t)         lua_pushnumber(L,(lua_Number)(t))
  75. #define l_gettime(L,arg)        luaL_checknumber(L, arg)
  76.  
  77. #endif                          /* } */
  78.  
  79.  
  80. #if !defined(l_gmtime)          /* { */
  81. /*
  82. ** By default, Lua uses gmtime/localtime, except when POSIX is available,
  83. ** where it uses gmtime_r/localtime_r
  84. */
  85.  
  86. #if defined(LUA_USE_POSIX)      /* { */
  87.  
  88. #define l_gmtime(t,r)           gmtime_r(t,r)
  89. #define l_localtime(t,r)        localtime_r(t,r)
  90.  
  91. #else                           /* }{ */
  92.  
  93. /* ISO C definitions */
  94. #define l_gmtime(t,r)           ((void)(r)->tm_sec, gmtime(t))
  95. #define l_localtime(t,r)        ((void)(r)->tm_sec, localtime(t))
  96.  
  97. #endif                          /* } */
  98.  
  99. #endif                          /* } */
  100.  
  101. /* }================================================================== */
  102.  
  103.  
  104. /*
  105. ** {==================================================================
  106. ** Configuration for 'tmpnam':
  107. ** By default, Lua uses tmpnam except when POSIX is available, where
  108. ** it uses mkstemp.
  109. ** ===================================================================
  110. */
  111. #if !defined(lua_tmpnam)        /* { */
  112.  
  113. #if defined(LUA_USE_POSIX)      /* { */
  114.  
  115. #include <unistd.h>
  116.  
  117. #define LUA_TMPNAMBUFSIZE       32
  118.  
  119. #if !defined(LUA_TMPNAMTEMPLATE)
  120. #define LUA_TMPNAMTEMPLATE      "/tmp/lua_XXXXXX"
  121. #endif
  122.  
  123. #define lua_tmpnam(b,e) { \
  124.         strcpy(b, LUA_TMPNAMTEMPLATE); \
  125.         e = mkstemp(b); \
  126.         if (e != -1) close(e); \
  127.         e = (e == -1); }
  128.  
  129. #else                           /* }{ */
  130.  
  131. /* ISO C definitions */
  132. #define LUA_TMPNAMBUFSIZE       L_tmpnam
  133. #define lua_tmpnam(b,e)         { e = (tmpnam(b) == NULL); }
  134.  
  135. #endif                          /* } */
  136.  
  137. #endif                          /* } */
  138. /* }================================================================== */
  139.  
  140.  
  141.  
  142. static int os_execute (lua_State *L) {
  143.   const char *cmd = luaL_optstring(L, 1, NULL);
  144.   int stat;
  145.   errno = 0;
  146.   stat = system(cmd);
  147.   if (cmd != NULL)
  148.     return luaL_execresult(L, stat);
  149.   else {
  150.     lua_pushboolean(L, stat);  /* true if there is a shell */
  151.     return 1;
  152.   }
  153. }
  154.  
  155.  
  156. static int os_remove (lua_State *L) {
  157.   const char *filename = luaL_checkstring(L, 1);
  158.   return luaL_fileresult(L, remove(filename) == 0, filename);
  159. }
  160.  
  161.  
  162. static int os_rename (lua_State *L) {
  163.   const char *fromname = luaL_checkstring(L, 1);
  164.   const char *toname = luaL_checkstring(L, 2);
  165.   return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
  166. }
  167.  
  168.  
  169. static int os_tmpname (lua_State *L) {
  170.   char buff[LUA_TMPNAMBUFSIZE];
  171.   int err;
  172.   lua_tmpnam(buff, err);
  173.   if (l_unlikely(err))
  174.     return luaL_error(L, "unable to generate a unique filename");
  175.   lua_pushstring(L, buff);
  176.   return 1;
  177. }
  178.  
  179.  
  180. static int os_getenv (lua_State *L) {
  181.   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  182.   return 1;
  183. }
  184.  
  185.  
  186. static int os_clock (lua_State *L) {
  187.   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  188.   return 1;
  189. }
  190.  
  191.  
  192. /*
  193. ** {======================================================
  194. ** Time/Date operations
  195. ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
  196. **   wday=%w+1, yday=%j, isdst=? }
  197. ** =======================================================
  198. */
  199.  
  200. /*
  201. ** About the overflow check: an overflow cannot occur when time
  202. ** is represented by a lua_Integer, because either lua_Integer is
  203. ** large enough to represent all int fields or it is not large enough
  204. ** to represent a time that cause a field to overflow.  However, if
  205. ** times are represented as doubles and lua_Integer is int, then the
  206. ** time 0x1.e1853b0d184f6p+55 would cause an overflow when adding 1900
  207. ** to compute the year.
  208. */
  209. static void setfield (lua_State *L, const char *key, int value, int delta) {
  210.   #if (defined(LUA_NUMTIME) && LUA_MAXINTEGER <= INT_MAX)
  211.     if (l_unlikely(value > LUA_MAXINTEGER - delta))
  212.       luaL_error(L, "field '%s' is out-of-bound", key);
  213.   #endif
  214.   lua_pushinteger(L, (lua_Integer)value + delta);
  215.   lua_setfield(L, -2, key);
  216. }
  217.  
  218.  
  219. static void setboolfield (lua_State *L, const char *key, int value) {
  220.   if (value < 0)  /* undefined? */
  221.     return;  /* does not set field */
  222.   lua_pushboolean(L, value);
  223.   lua_setfield(L, -2, key);
  224. }
  225.  
  226.  
  227. /*
  228. ** Set all fields from structure 'tm' in the table on top of the stack
  229. */
  230. static void setallfields (lua_State *L, struct tm *stm) {
  231.   setfield(L, "year", stm->tm_year, 1900);
  232.   setfield(L, "month", stm->tm_mon, 1);
  233.   setfield(L, "day", stm->tm_mday, 0);
  234.   setfield(L, "hour", stm->tm_hour, 0);
  235.   setfield(L, "min", stm->tm_min, 0);
  236.   setfield(L, "sec", stm->tm_sec, 0);
  237.   setfield(L, "yday", stm->tm_yday, 1);
  238.   setfield(L, "wday", stm->tm_wday, 1);
  239.   setboolfield(L, "isdst", stm->tm_isdst);
  240. }
  241.  
  242.  
  243. static int getboolfield (lua_State *L, const char *key) {
  244.   int res;
  245.   res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
  246.   lua_pop(L, 1);
  247.   return res;
  248. }
  249.  
  250.  
  251. static int getfield (lua_State *L, const char *key, int d, int delta) {
  252.   int isnum;
  253.   int t = lua_getfield(L, -1, key);  /* get field and its type */
  254.   lua_Integer res = lua_tointegerx(L, -1, &isnum);
  255.   if (!isnum) {  /* field is not an integer? */
  256.     if (l_unlikely(t != LUA_TNIL))  /* some other value? */
  257.       return luaL_error(L, "field '%s' is not an integer", key);
  258.     else if (l_unlikely(d < 0))  /* absent field; no default? */
  259.       return luaL_error(L, "field '%s' missing in date table", key);
  260.     res = d;
  261.   }
  262.   else {
  263.     /* unsigned avoids overflow when lua_Integer has 32 bits */
  264.     if (!(res >= 0 ? (lua_Unsigned)res <= (lua_Unsigned)INT_MAX + delta
  265.                    : (lua_Integer)INT_MIN + delta <= res))
  266.       return luaL_error(L, "field '%s' is out-of-bound", key);
  267.     res -= delta;
  268.   }
  269.   lua_pop(L, 1);
  270.   return (int)res;
  271. }
  272.  
  273.  
  274. static const char *checkoption (lua_State *L, const char *conv,
  275.                                 ptrdiff_t convlen, char *buff) {
  276.   const char *option = LUA_STRFTIMEOPTIONS;
  277.   int oplen = 1;  /* length of options being checked */
  278.   for (; *option != '\0' && oplen <= convlen; option += oplen) {
  279.     if (*option == '|')  /* next block? */
  280.       oplen++;  /* will check options with next length (+1) */
  281.     else if (memcmp(conv, option, oplen) == 0) {  /* match? */
  282.       memcpy(buff, conv, oplen);  /* copy valid option to buffer */
  283.       buff[oplen] = '\0';
  284.       return conv + oplen;  /* return next item */
  285.     }
  286.   }
  287.   luaL_argerror(L, 1,
  288.     lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
  289.   return conv;  /* to avoid warnings */
  290. }
  291.  
  292.  
  293. static time_t l_checktime (lua_State *L, int arg) {
  294.   l_timet t = l_gettime(L, arg);
  295.   luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds");
  296.   return (time_t)t;
  297. }
  298.  
  299.  
  300. /* maximum size for an individual 'strftime' item */
  301. #define SIZETIMEFMT     250
  302.  
  303.  
  304. static int os_date (lua_State *L) {
  305.   size_t slen;
  306.   const char *s = luaL_optlstring(L, 1, "%c", &slen);
  307.   time_t t = luaL_opt(L, l_checktime, 2, time(NULL));
  308.   const char *se = s + slen;  /* 's' end */
  309.   struct tm tmr, *stm;
  310.   if (*s == '!') {  /* UTC? */
  311.     stm = l_gmtime(&t, &tmr);
  312.     s++;  /* skip '!' */
  313.   }
  314.   else
  315.     stm = l_localtime(&t, &tmr);
  316.   if (stm == NULL)  /* invalid date? */
  317.     return luaL_error(L,
  318.                  "date result cannot be represented in this installation");
  319.   if (strcmp(s, "*t") == 0) {
  320.     lua_createtable(L, 0, 9);  /* 9 = number of fields */
  321.     setallfields(L, stm);
  322.   }
  323.   else {
  324.     char cc[4];  /* buffer for individual conversion specifiers */
  325.     luaL_Buffer b;
  326.     cc[0] = '%';
  327.     luaL_buffinit(L, &b);
  328.     while (s < se) {
  329.       if (*s != '%')  /* not a conversion specifier? */
  330.         luaL_addchar(&b, *s++);
  331.       else {
  332.         size_t reslen;
  333.         char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT);
  334.         s++;  /* skip '%' */
  335.         s = checkoption(L, s, se - s, cc + 1);  /* copy specifier to 'cc' */
  336.         reslen = strftime(buff, SIZETIMEFMT, cc, stm);
  337.         luaL_addsize(&b, reslen);
  338.       }
  339.     }
  340.     luaL_pushresult(&b);
  341.   }
  342.   return 1;
  343. }
  344.  
  345.  
  346. static int os_time (lua_State *L) {
  347.   time_t t;
  348.   if (lua_isnoneornil(L, 1))  /* called without args? */
  349.     t = time(NULL);  /* get current time */
  350.   else {
  351.     struct tm ts;
  352.     luaL_checktype(L, 1, LUA_TTABLE);
  353.     lua_settop(L, 1);  /* make sure table is at the top */
  354.     ts.tm_year = getfield(L, "year", -1, 1900);
  355.     ts.tm_mon = getfield(L, "month", -1, 1);
  356.     ts.tm_mday = getfield(L, "day", -1, 0);
  357.     ts.tm_hour = getfield(L, "hour", 12, 0);
  358.     ts.tm_min = getfield(L, "min", 0, 0);
  359.     ts.tm_sec = getfield(L, "sec", 0, 0);
  360.     ts.tm_isdst = getboolfield(L, "isdst");
  361.     t = mktime(&ts);
  362.     setallfields(L, &ts);  /* update fields with normalized values */
  363.   }
  364.   if (t != (time_t)(l_timet)t || t == (time_t)(-1))
  365.     return luaL_error(L,
  366.                   "time result cannot be represented in this installation");
  367.   l_pushtime(L, t);
  368.   return 1;
  369. }
  370.  
  371.  
  372. static int os_difftime (lua_State *L) {
  373.   time_t t1 = l_checktime(L, 1);
  374.   time_t t2 = l_checktime(L, 2);
  375.   lua_pushnumber(L, (lua_Number)difftime(t1, t2));
  376.   return 1;
  377. }
  378.  
  379. /* }====================================================== */
  380.  
  381.  
  382. static int os_setlocale (lua_State *L) {
  383.   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
  384.                       LC_NUMERIC, LC_TIME};
  385.   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
  386.      "numeric", "time", NULL};
  387.   const char *l = luaL_optstring(L, 1, NULL);
  388.   int op = luaL_checkoption(L, 2, "all", catnames);
  389.   lua_pushstring(L, setlocale(cat[op], l));
  390.   return 1;
  391. }
  392.  
  393.  
  394. static int os_exit (lua_State *L) {
  395.   int status;
  396.   if (lua_isboolean(L, 1))
  397.     status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
  398.   else
  399.     status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);
  400.   if (lua_toboolean(L, 2))
  401.     lua_close(L);
  402.   if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
  403.   return 0;
  404. }
  405.  
  406.  
  407. static const luaL_Reg syslib[] = {
  408.   {"clock",     os_clock},
  409.   {"date",      os_date},
  410.   {"difftime",  os_difftime},
  411.   {"execute",   os_execute},
  412.   {"exit",      os_exit},
  413.   {"getenv",    os_getenv},
  414.   {"remove",    os_remove},
  415.   {"rename",    os_rename},
  416.   {"setlocale", os_setlocale},
  417.   {"time",      os_time},
  418.   {"tmpname",   os_tmpname},
  419.   {NULL, NULL}
  420. };
  421.  
  422. /* }====================================================== */
  423.  
  424.  
  425.  
  426. LUAMOD_API int luaopen_os (lua_State *L) {
  427.   luaL_newlib(L, syslib);
  428.   return 1;
  429. }
  430.  
  431.