ceph/src/civetweb/src/third_party/lua-5.3.1/src/loslib.c

   1 /*
   2 ** $Id: loslib.c,v 1.57 2015/04/10 17:41:04 roberto Exp $
   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 ** ===================================================================
  29 */
  30 #if !defined(LUA_STRFTIMEOPTIONS)       /* { */
  31
  32 #if defined(LUA_USE_C89)
  33 #define LUA_STRFTIMEOPTIONS     { "aAbBcdHIjmMpSUwWxXyYz%", "" }
  34 #else  /* C99 specification */
  35 #define LUA_STRFTIMEOPTIONS \
  36         { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "", \
  37           "E", "cCxXyY",  \
  38           "O", "deHImMSuUVwWy" }
  39 #endif
  40
  41 #endif                                  /* } */
  42 /* }================================================================== */
  43
  44
  45 /*
  46 ** {==================================================================
  47 ** Configuration for time-related stuff
  48 ** ===================================================================
  49 */
  50
  51 #if !defined(l_time_t)          /* { */
  52 /*
  53 ** type to represent time_t in Lua
  54 */
  55 #define l_timet                 lua_Integer
  56 #define l_pushtime(L,t)         lua_pushinteger(L,(lua_Integer)(t))
  57 #define l_checktime(L,a)        ((time_t)luaL_checkinteger(L,a))
  58
  59 #endif                          /* } */
  60
  61
  62 #if !defined(l_gmtime)          /* { */
  63 /*
  64 ** By default, Lua uses gmtime/localtime, except when POSIX is available,
  65 ** where it uses gmtime_r/localtime_r
  66 */
  67
  68 #if defined(LUA_USE_POSIX)      /* { */
  69
  70 #define l_gmtime(t,r)           gmtime_r(t,r)
  71 #define l_localtime(t,r)        localtime_r(t,r)
  72
  73 #else                           /* }{ */
  74
  75 /* ISO C definitions */
  76 #define l_gmtime(t,r)           ((void)(r)->tm_sec, gmtime(t))
  77 #define l_localtime(t,r)        ((void)(r)->tm_sec, localtime(t))
  78
  79 #endif                          /* } */
  80
  81 #endif                          /* } */
  82
  83 /* }================================================================== */
  84
  85
  86 /*
  87 ** {==================================================================
  88 ** Configuration for 'tmpnam':
  89 ** By default, Lua uses tmpnam except when POSIX is available, where
  90 ** it uses mkstemp.
  91 ** ===================================================================
  92 */
  93 #if !defined(lua_tmpnam)        /* { */
  94
  95 #if defined(LUA_USE_POSIX)      /* { */
  96
  97 #include <unistd.h>
  98
  99 #define LUA_TMPNAMBUFSIZE       32
 100
 101 #if !defined(LUA_TMPNAMTEMPLATE)
 102 #define LUA_TMPNAMTEMPLATE      "/tmp/lua_XXXXXX"
 103 #endif
 104
 105 #define lua_tmpnam(b,e) { \
 106         strcpy(b, LUA_TMPNAMTEMPLATE); \
 107         e = mkstemp(b); \
 108         if (e != -1) close(e); \
 109         e = (e == -1); }
 110
 111 #else                           /* }{ */
 112
 113 /* ISO C definitions */
 114 #define LUA_TMPNAMBUFSIZE       L_tmpnam
 115 #define lua_tmpnam(b,e)         { e = (tmpnam(b) == NULL); }
 116
 117 #endif                          /* } */
 118
 119 #endif                          /* } */
 120 /* }================================================================== */
 121
 122
 123
 124
 125 static int os_execute (lua_State *L) {
 126   const char *cmd = luaL_optstring(L, 1, NULL);
 127   int stat = system(cmd);
 128   if (cmd != NULL)
 129     return luaL_execresult(L, stat);
 130   else {
 131     lua_pushboolean(L, stat);  /* true if there is a shell */
 132     return 1;
 133   }
 134 }
 135
 136
 137 static int os_remove (lua_State *L) {
 138   const char *filename = luaL_checkstring(L, 1);
 139   return luaL_fileresult(L, remove(filename) == 0, filename);
 140 }
 141
 142
 143 static int os_rename (lua_State *L) {
 144   const char *fromname = luaL_checkstring(L, 1);
 145   const char *toname = luaL_checkstring(L, 2);
 146   return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
 147 }
 148
 149
 150 static int os_tmpname (lua_State *L) {
 151   char buff[LUA_TMPNAMBUFSIZE];
 152   int err;
 153   lua_tmpnam(buff, err);
 154   if (err)
 155     return luaL_error(L, "unable to generate a unique filename");
 156   lua_pushstring(L, buff);
 157   return 1;
 158 }
 159
 160
 161 static int os_getenv (lua_State *L) {
 162   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
 163   return 1;
 164 }
 165
 166
 167 static int os_clock (lua_State *L) {
 168   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
 169   return 1;
 170 }
 171
 172
 173 /*
 174 ** {======================================================
 175 ** Time/Date operations
 176 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
 177 **   wday=%w+1, yday=%j, isdst=? }
 178 ** =======================================================
 179 */
 180
 181 static void setfield (lua_State *L, const char *key, int value) {
 182   lua_pushinteger(L, value);
 183   lua_setfield(L, -2, key);
 184 }
 185
 186 static void setboolfield (lua_State *L, const char *key, int value) {
 187   if (value < 0)  /* undefined? */
 188     return;  /* does not set field */
 189   lua_pushboolean(L, value);
 190   lua_setfield(L, -2, key);
 191 }
 192
 193 static int getboolfield (lua_State *L, const char *key) {
 194   int res;
 195   res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
 196   lua_pop(L, 1);
 197   return res;
 198 }
 199
 200
 201 static int getfield (lua_State *L, const char *key, int d) {
 202   int res, isnum;
 203   lua_getfield(L, -1, key);
 204   res = (int)lua_tointegerx(L, -1, &isnum);
 205   if (!isnum) {
 206     if (d < 0)
 207       return luaL_error(L, "field '%s' missing in date table", key);
 208     res = d;
 209   }
 210   lua_pop(L, 1);
 211   return res;
 212 }
 213
 214
 215 static const char *checkoption (lua_State *L, const char *conv, char *buff) {
 216   static const char *const options[] = LUA_STRFTIMEOPTIONS;
 217   unsigned int i;
 218   for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
 219     if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
 220       buff[1] = *conv;
 221       if (*options[i + 1] == '\0') {  /* one-char conversion specifier? */
 222         buff[2] = '\0';  /* end buffer */
 223         return conv + 1;
 224       }
 225       else if (*(conv + 1) != '\0' &&
 226                strchr(options[i + 1], *(conv + 1)) != NULL) {
 227         buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
 228         buff[3] = '\0';  /* end buffer */
 229         return conv + 2;
 230       }
 231     }
 232   }
 233   luaL_argerror(L, 1,
 234     lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
 235   return conv;  /* to avoid warnings */
 236 }
 237
 238
 239 static int os_date (lua_State *L) {
 240   const char *s = luaL_optstring(L, 1, "%c");
 241   time_t t = luaL_opt(L, l_checktime, 2, time(NULL));
 242   struct tm tmr, *stm;
 243   if (*s == '!') {  /* UTC? */
 244     stm = l_gmtime(&t, &tmr);
 245     s++;  /* skip '!' */
 246   }
 247   else
 248     stm = l_localtime(&t, &tmr);
 249   if (stm == NULL)  /* invalid date? */
 250     lua_pushnil(L);
 251   else if (strcmp(s, "*t") == 0) {
 252     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 253     setfield(L, "sec", stm->tm_sec);
 254     setfield(L, "min", stm->tm_min);
 255     setfield(L, "hour", stm->tm_hour);
 256     setfield(L, "day", stm->tm_mday);
 257     setfield(L, "month", stm->tm_mon+1);
 258     setfield(L, "year", stm->tm_year+1900);
 259     setfield(L, "wday", stm->tm_wday+1);
 260     setfield(L, "yday", stm->tm_yday+1);
 261     setboolfield(L, "isdst", stm->tm_isdst);
 262   }
 263   else {
 264     char cc[4];
 265     luaL_Buffer b;
 266     cc[0] = '%';
 267     luaL_buffinit(L, &b);
 268     while (*s) {
 269       if (*s != '%')  /* no conversion specifier? */
 270         luaL_addchar(&b, *s++);
 271       else {
 272         size_t reslen;
 273         char buff[200];  /* should be big enough for any conversion result */
 274         s = checkoption(L, s + 1, cc);
 275         reslen = strftime(buff, sizeof(buff), cc, stm);
 276         luaL_addlstring(&b, buff, reslen);
 277       }
 278     }
 279     luaL_pushresult(&b);
 280   }
 281   return 1;
 282 }
 283
 284
 285 static int os_time (lua_State *L) {
 286   time_t t;
 287   if (lua_isnoneornil(L, 1))  /* called without args? */
 288     t = time(NULL);  /* get current time */
 289   else {
 290     struct tm ts;
 291     luaL_checktype(L, 1, LUA_TTABLE);
 292     lua_settop(L, 1);  /* make sure table is at the top */
 293     ts.tm_sec = getfield(L, "sec", 0);
 294     ts.tm_min = getfield(L, "min", 0);
 295     ts.tm_hour = getfield(L, "hour", 12);
 296     ts.tm_mday = getfield(L, "day", -1);
 297     ts.tm_mon = getfield(L, "month", -1) - 1;
 298     ts.tm_year = getfield(L, "year", -1) - 1900;
 299     ts.tm_isdst = getboolfield(L, "isdst");
 300     t = mktime(&ts);
 301   }
 302   if (t != (time_t)(l_timet)t)
 303     luaL_error(L, "time result cannot be represented in this Lua installation");
 304   else if (t == (time_t)(-1))
 305     lua_pushnil(L);
 306   else
 307     l_pushtime(L, t);
 308   return 1;
 309 }
 310
 311
 312 static int os_difftime (lua_State *L) {
 313   time_t t1 = l_checktime(L, 1);
 314   time_t t2 = l_checktime(L, 2);
 315   lua_pushnumber(L, (lua_Number)difftime(t1, t2));
 316   return 1;
 317 }
 318
 319 /* }====================================================== */
 320
 321
 322 static int os_setlocale (lua_State *L) {
 323   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
 324                       LC_NUMERIC, LC_TIME};
 325   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
 326      "numeric", "time", NULL};
 327   const char *l = luaL_optstring(L, 1, NULL);
 328   int op = luaL_checkoption(L, 2, "all", catnames);
 329   lua_pushstring(L, setlocale(cat[op], l));
 330   return 1;
 331 }
 332
 333
 334 static int os_exit (lua_State *L) {
 335   int status;
 336   if (lua_isboolean(L, 1))
 337     status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
 338   else
 339     status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);
 340   if (lua_toboolean(L, 2))
 341     lua_close(L);
 342   if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
 343   return 0;
 344 }
 345
 346
 347 static const luaL_Reg syslib[] = {
 348   {"clock",     os_clock},
 349   {"date",      os_date},
 350   {"difftime",  os_difftime},
 351   {"execute",   os_execute},
 352   {"exit",      os_exit},
 353   {"getenv",    os_getenv},
 354   {"remove",    os_remove},
 355   {"rename",    os_rename},
 356   {"setlocale", os_setlocale},
 357   {"time",      os_time},
 358   {"tmpname",   os_tmpname},
 359   {NULL, NULL}
 360 };
 361
 362 /* }====================================================== */
 363
 364
 365
 366 LUAMOD_API int luaopen_os (lua_State *L) {
 367   luaL_newlib(L, syslib);
 368   return 1;
 369 }
 370