client/deps/liblua/loslib.c

   1 /*
   2 ** $Id: loslib.c,v 1.40 2012/10/19 15:54:02 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             } else if (*(conv + 1) != '\0' &&
 181                        strchr(options[i + 1], *(conv + 1)) != NULL) {
 182                 buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
 183                 buff[3] = '\0';  /* end buffer */
 184                 return conv + 2;
 185             }
 186         }
 187     }
 188     luaL_argerror(L, 1,
 189                   lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
 190     return conv;  /* to avoid warnings */
 191 }
 192
 193
 194 static int os_date(lua_State *L) {
 195     const char *s = luaL_optstring(L, 1, "%c");
 196     time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
 197     struct tm tmr, *stm;
 198     if (*s == '!') {  /* UTC? */
 199         stm = l_gmtime(&t, &tmr);
 200         s++;  /* skip `!' */
 201     } else
 202         stm = l_localtime(&t, &tmr);
 203     if (stm == NULL)  /* invalid date? */
 204         lua_pushnil(L);
 205     else if (strcmp(s, "*t") == 0) {
 206         lua_createtable(L, 0, 9);  /* 9 = number of fields */
 207         setfield(L, "sec", stm->tm_sec);
 208         setfield(L, "min", stm->tm_min);
 209         setfield(L, "hour", stm->tm_hour);
 210         setfield(L, "day", stm->tm_mday);
 211         setfield(L, "month", stm->tm_mon + 1);
 212         setfield(L, "year", stm->tm_year + 1900);
 213         setfield(L, "wday", stm->tm_wday + 1);
 214         setfield(L, "yday", stm->tm_yday + 1);
 215         setboolfield(L, "isdst", stm->tm_isdst);
 216     } else {
 217         char cc[4];
 218         luaL_Buffer b;
 219         cc[0] = '%';
 220         luaL_buffinit(L, &b);
 221         while (*s) {
 222             if (*s != '%')  /* no conversion specifier? */
 223                 luaL_addchar(&b, *s++);
 224             else {
 225                 size_t reslen;
 226                 char buff[200];  /* should be big enough for any conversion result */
 227                 s = checkoption(L, s + 1, cc);
 228                 reslen = strftime(buff, sizeof(buff), cc, stm);
 229                 luaL_addlstring(&b, buff, reslen);
 230             }
 231         }
 232         luaL_pushresult(&b);
 233     }
 234     return 1;
 235 }
 236
 237
 238 static int os_time(lua_State *L) {
 239     time_t t;
 240     if (lua_isnoneornil(L, 1))  /* called without args? */
 241         t = time(NULL);  /* get current time */
 242     else {
 243         struct tm ts;
 244         luaL_checktype(L, 1, LUA_TTABLE);
 245         lua_settop(L, 1);  /* make sure table is at the top */
 246         ts.tm_sec = getfield(L, "sec", 0);
 247         ts.tm_min = getfield(L, "min", 0);
 248         ts.tm_hour = getfield(L, "hour", 12);
 249         ts.tm_mday = getfield(L, "day", -1);
 250         ts.tm_mon = getfield(L, "month", -1) - 1;
 251         ts.tm_year = getfield(L, "year", -1) - 1900;
 252         ts.tm_isdst = getboolfield(L, "isdst");
 253         t = mktime(&ts);
 254     }
 255     if (t == (time_t)(-1))
 256         lua_pushnil(L);
 257     else
 258         lua_pushnumber(L, (lua_Number)t);
 259     return 1;
 260 }
 261
 262
 263 static int os_difftime(lua_State *L) {
 264     lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
 265                                (time_t)(luaL_optnumber(L, 2, 0))));
 266     return 1;
 267 }
 268
 269 /* }====================================================== */
 270
 271
 272 static int os_setlocale(lua_State *L) {
 273     static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
 274                               LC_NUMERIC, LC_TIME
 275                              };
 276     static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
 277                                            "numeric", "time", NULL
 278                                           };
 279     const char *l = luaL_optstring(L, 1, NULL);
 280     int op = luaL_checkoption(L, 2, "all", catnames);
 281     lua_pushstring(L, setlocale(cat[op], l));
 282     return 1;
 283 }
 284
 285
 286 static int os_exit(lua_State *L) {
 287     int status;
 288     if (lua_isboolean(L, 1))
 289         status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
 290     else
 291         status = luaL_optint(L, 1, EXIT_SUCCESS);
 292     if (lua_toboolean(L, 2))
 293         lua_close(L);
 294     if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
 295     return 0;
 296 }
 297
 298
 299 static const luaL_Reg syslib[] = {
 300     {"clock",     os_clock},
 301     {"date",      os_date},
 302     {"difftime",  os_difftime},
 303     {"execute",   os_execute},
 304     {"exit",      os_exit},
 305     {"getenv",    os_getenv},
 306     {"remove",    os_remove},
 307     {"rename",    os_rename},
 308     {"setlocale", os_setlocale},
 309     {"time",      os_time},
 310     {"tmpname",   os_tmpname},
 311     {NULL, NULL}
 312 };
 313
 314 /* }====================================================== */
 315
 316
 317
 318 LUAMOD_API int luaopen_os(lua_State *L) {
 319     luaL_newlib(L, syslib);
 320     return 1;
 321 }
 322