src/lib_os.c

   1 /*
   2 ** OS library.
   3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
   4 **
   5 ** Major portions taken verbatim or adapted from the Lua interpreter.
   6 ** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
   7 */
   8
   9 #include <errno.h>
  10 #include <time.h>
  11
  12 #define lib_os_c
  13 #define LUA_LIB
  14
  15 #include "lua.h"
  16 #include "lauxlib.h"
  17 #include "lualib.h"
  18
  19 #include "lj_obj.h"
  20 #include "lj_gc.h"
  21 #include "lj_err.h"
  22 #include "lj_buf.h"
  23 #include "lj_str.h"
  24 #include "lj_lib.h"
  25
  26 #if LJ_TARGET_POSIX
  27 #include <unistd.h>
  28 #else
  29 #include <stdio.h>
  30 #endif
  31
  32 #if !LJ_TARGET_PSVITA
  33 #include <locale.h>
  34 #endif
  35
  36 /* ------------------------------------------------------------------------ */
  37
  38 #define LJLIB_MODULE_os
  39
  40 LJLIB_CF(os_execute)
  41 {
  42 #if LJ_NO_SYSTEM
  43 #if LJ_52
  44   errno = ENOSYS;
  45   return luaL_fileresult(L, 0, NULL);
  46 #else
  47   lua_pushinteger(L, -1);
  48   return 1;
  49 #endif
  50 #else
  51   const char *cmd = luaL_optstring(L, 1, NULL);
  52   int stat = system(cmd);
  53 #if LJ_52
  54   if (cmd)
  55     return luaL_execresult(L, stat);
  56   setboolV(L->top++, 1);
  57 #else
  58   setintV(L->top++, stat);
  59 #endif
  60   return 1;
  61 #endif
  62 }
  63
  64 LJLIB_CF(os_remove)
  65 {
  66   const char *filename = luaL_checkstring(L, 1);
  67   return luaL_fileresult(L, remove(filename) == 0, filename);
  68 }
  69
  70 LJLIB_CF(os_rename)
  71 {
  72   const char *fromname = luaL_checkstring(L, 1);
  73   const char *toname = luaL_checkstring(L, 2);
  74   return luaL_fileresult(L, rename(fromname, toname) == 0, fromname);
  75 }
  76
  77 LJLIB_CF(os_tmpname)
  78 {
  79 #if LJ_TARGET_PS3 || LJ_TARGET_PS4 || LJ_TARGET_PS5 || LJ_TARGET_PSVITA || LJ_TARGET_NX
  80   lj_err_caller(L, LJ_ERR_OSUNIQF);
  81   return 0;
  82 #else
  83 #if LJ_TARGET_POSIX
  84   char buf[15+1];
  85   int fp;
  86   strcpy(buf, "/tmp/lua_XXXXXX");
  87   fp = mkstemp(buf);
  88   if (fp != -1)
  89     close(fp);
  90   else
  91     lj_err_caller(L, LJ_ERR_OSUNIQF);
  92 #else
  93   char buf[L_tmpnam];
  94   if (tmpnam(buf) == NULL)
  95     lj_err_caller(L, LJ_ERR_OSUNIQF);
  96 #endif
  97   lua_pushstring(L, buf);
  98   return 1;
  99 #endif
 100 }
 101
 102 LJLIB_CF(os_getenv)
 103 {
 104 #if LJ_TARGET_CONSOLE
 105   lua_pushnil(L);
 106 #else
 107   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
 108 #endif
 109   return 1;
 110 }
 111
 112 LJLIB_CF(os_exit)
 113 {
 114   int status;
 115   if (L->base < L->top && tvisbool(L->base))
 116     status = boolV(L->base) ? EXIT_SUCCESS : EXIT_FAILURE;
 117   else
 118     status = lj_lib_optint(L, 1, EXIT_SUCCESS);
 119   if (L->base+1 < L->top && tvistruecond(L->base+1))
 120     lua_close(L);
 121   exit(status);
 122   return 0;  /* Unreachable. */
 123 }
 124
 125 LJLIB_CF(os_clock)
 126 {
 127   setnumV(L->top++, ((lua_Number)clock())*(1.0/(lua_Number)CLOCKS_PER_SEC));
 128   return 1;
 129 }
 130
 131 /* ------------------------------------------------------------------------ */
 132
 133 static void setfield(lua_State *L, const char *key, int value)
 134 {
 135   lua_pushinteger(L, value);
 136   lua_setfield(L, -2, key);
 137 }
 138
 139 static void setboolfield(lua_State *L, const char *key, int value)
 140 {
 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 {
 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 static int getfield(lua_State *L, const char *key, int d)
 157 {
 158   int res;
 159   lua_getfield(L, -1, key);
 160   if (lua_isnumber(L, -1)) {
 161     res = (int)lua_tointeger(L, -1);
 162   } else {
 163     if (d < 0)
 164       lj_err_callerv(L, LJ_ERR_OSDATEF, key);
 165     res = d;
 166   }
 167   lua_pop(L, 1);
 168   return res;
 169 }
 170
 171 LJLIB_CF(os_date)
 172 {
 173   const char *s = luaL_optstring(L, 1, "%c");
 174   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
 175   struct tm *stm;
 176 #if LJ_TARGET_POSIX
 177   struct tm rtm;
 178 #endif
 179   if (*s == '!') {  /* UTC? */
 180     s++;  /* Skip '!' */
 181 #if LJ_TARGET_POSIX
 182     stm = gmtime_r(&t, &rtm);
 183 #else
 184     stm = gmtime(&t);
 185 #endif
 186   } else {
 187 #if LJ_TARGET_POSIX
 188     stm = localtime_r(&t, &rtm);
 189 #else
 190     stm = localtime(&t);
 191 #endif
 192   }
 193   if (stm == NULL) {  /* Invalid date? */
 194     setnilV(L->top++);
 195   } else if (strcmp(s, "*t") == 0) {
 196     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 197     setfield(L, "sec", stm->tm_sec);
 198     setfield(L, "min", stm->tm_min);
 199     setfield(L, "hour", stm->tm_hour);
 200     setfield(L, "day", stm->tm_mday);
 201     setfield(L, "month", stm->tm_mon+1);
 202     setfield(L, "year", stm->tm_year+1900);
 203     setfield(L, "wday", stm->tm_wday+1);
 204     setfield(L, "yday", stm->tm_yday+1);
 205     setboolfield(L, "isdst", stm->tm_isdst);
 206   } else if (*s) {
 207     SBuf *sb = &G(L)->tmpbuf;
 208     MSize sz = 0, retry = 4;
 209     const char *q;
 210     for (q = s; *q; q++)
 211       sz += (*q == '%') ? 30 : 1;  /* Overflow doesn't matter. */
 212     setsbufL(sb, L);
 213     while (retry--) {  /* Limit growth for invalid format or empty result. */
 214       char *buf = lj_buf_need(sb, sz);
 215       size_t len = strftime(buf, sbufsz(sb), s, stm);
 216       if (len) {
 217         setstrV(L, L->top++, lj_str_new(L, buf, len));
 218         lj_gc_check(L);
 219         break;
 220       }
 221       sz += (sz|1);
 222     }
 223   } else {
 224     setstrV(L, L->top++, &G(L)->strempty);
 225   }
 226   return 1;
 227 }
 228
 229 LJLIB_CF(os_time)
 230 {
 231   time_t t;
 232   if (lua_isnoneornil(L, 1)) {  /* called without args? */
 233     t = time(NULL);  /* get current time */
 234   } else {
 235     struct tm ts;
 236     luaL_checktype(L, 1, LUA_TTABLE);
 237     lua_settop(L, 1);  /* make sure table is at the top */
 238     ts.tm_sec = getfield(L, "sec", 0);
 239     ts.tm_min = getfield(L, "min", 0);
 240     ts.tm_hour = getfield(L, "hour", 12);
 241     ts.tm_mday = getfield(L, "day", -1);
 242     ts.tm_mon = getfield(L, "month", -1) - 1;
 243     ts.tm_year = getfield(L, "year", -1) - 1900;
 244     ts.tm_isdst = getboolfield(L, "isdst");
 245     t = mktime(&ts);
 246   }
 247   if (t == (time_t)(-1))
 248     lua_pushnil(L);
 249   else
 250     lua_pushnumber(L, (lua_Number)t);
 251   return 1;
 252 }
 253
 254 LJLIB_CF(os_difftime)
 255 {
 256   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
 257                              (time_t)(luaL_optnumber(L, 2, (lua_Number)0))));
 258   return 1;
 259 }
 260
 261 /* ------------------------------------------------------------------------ */
 262
 263 LJLIB_CF(os_setlocale)
 264 {
 265 #if LJ_TARGET_PSVITA
 266   lua_pushliteral(L, "C");
 267 #else
 268   GCstr *s = lj_lib_optstr(L, 1);
 269   const char *str = s ? strdata(s) : NULL;
 270   int opt = lj_lib_checkopt(L, 2, 6,
 271     "\5ctype\7numeric\4time\7collate\10monetary\1\377\3all");
 272   if (opt == 0) opt = LC_CTYPE;
 273   else if (opt == 1) opt = LC_NUMERIC;
 274   else if (opt == 2) opt = LC_TIME;
 275   else if (opt == 3) opt = LC_COLLATE;
 276   else if (opt == 4) opt = LC_MONETARY;
 277   else if (opt == 6) opt = LC_ALL;
 278   lua_pushstring(L, setlocale(opt, str));
 279 #endif
 280   return 1;
 281 }
 282
 283 /* ------------------------------------------------------------------------ */
 284
 285 #include "lj_libdef.h"
 286
 287 LUALIB_API int luaopen_os(lua_State *L)
 288 {
 289   LJ_LIB_REG(L, LUA_OSLIBNAME, os);
 290   return 1;
 291 }
 292