client/deps/liblua/loslib.c

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