external/mit/lua/dist/src/loslib.c

   1 /*      $NetBSD: loslib.c,v 1.4 2015/10/08 13:21:00 mbalmer Exp $       */
   2
   3 /*
   4 ** Id: loslib.c,v 1.57 2015/04/10 17:41:04 roberto Exp
   5 ** Standard Operating System library
   6 ** See Copyright Notice in lua.h
   7 */
   8
   9 #define loslib_c
  10 #define LUA_LIB
  11
  12 #include "lprefix.h"
  13
  14
  15 #include <errno.h>
  16 #include <locale.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <time.h>
  20
  21 #include "lua.h"
  22
  23 #include "lauxlib.h"
  24 #include "lualib.h"
  25
  26
  27 /*
  28 ** {==================================================================
  29 ** list of valid conversion specifiers for the 'strftime' function
  30 ** ===================================================================
  31 */
  32 #if !defined(LUA_STRFTIMEOPTIONS)       /* { */
  33
  34 #if defined(LUA_USE_C89)
  35 #define LUA_STRFTIMEOPTIONS     { "aAbBcdHIjmMpSUwWxXyYz%", "" }
  36 #else  /* C99 specification */
  37 #define LUA_STRFTIMEOPTIONS \
  38         { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "", \
  39           "E", "cCxXyY",  \
  40           "O", "deHImMSuUVwWy" }
  41 #endif
  42
  43 #endif                                  /* } */
  44 /* }================================================================== */
  45
  46
  47 /*
  48 ** {==================================================================
  49 ** Configuration for time-related stuff
  50 ** ===================================================================
  51 */
  52
  53 #if !defined(l_time_t)          /* { */
  54 /*
  55 ** type to represent time_t in Lua
  56 */
  57 #define l_timet                 lua_Integer
  58 #define l_pushtime(L,t)         lua_pushinteger(L,(lua_Integer)(t))
  59 #define l_checktime(L,a)        ((time_t)luaL_checkinteger(L,a))
  60
  61 #endif                          /* } */
  62
  63
  64 #if !defined(l_gmtime)          /* { */
  65 /*
  66 ** By default, Lua uses gmtime/localtime, except when POSIX is available,
  67 ** where it uses gmtime_r/localtime_r
  68 */
  69
  70 #if defined(LUA_USE_POSIX)      /* { */
  71
  72 #define l_gmtime(t,r)           gmtime_r(t,r)
  73 #define l_localtime(t,r)        localtime_r(t,r)
  74
  75 #else                           /* }{ */
  76
  77 /* ISO C definitions */
  78 #define l_gmtime(t,r)           ((void)(r)->tm_sec, gmtime(t))
  79 #define l_localtime(t,r)        ((void)(r)->tm_sec, localtime(t))
  80
  81 #endif                          /* } */
  82
  83 #endif                          /* } */
  84
  85 /* }================================================================== */
  86
  87
  88 /*
  89 ** {==================================================================
  90 ** Configuration for 'tmpnam':
  91 ** By default, Lua uses tmpnam except when POSIX is available, where
  92 ** it uses mkstemp.
  93 ** ===================================================================
  94 */
  95 #if !defined(lua_tmpnam)        /* { */
  96
  97 #if defined(LUA_USE_POSIX)      /* { */
  98
  99 #include <unistd.h>
 100
 101 #define LUA_TMPNAMBUFSIZE       32
 102
 103 #if !defined(LUA_TMPNAMTEMPLATE)
 104 #define LUA_TMPNAMTEMPLATE      "/tmp/lua_XXXXXX"
 105 #endif
 106
 107 #define lua_tmpnam(b,e) { \
 108         strcpy(b, LUA_TMPNAMTEMPLATE); \
 109         e = mkstemp(b); \
 110         if (e != -1) close(e); \
 111         e = (e == -1); }
 112
 113 #else                           /* }{ */
 114
 115 /* ISO C definitions */
 116 #define LUA_TMPNAMBUFSIZE       L_tmpnam
 117 #define lua_tmpnam(b,e)         { e = (tmpnam(b) == NULL); }
 118
 119 #endif                          /* } */
 120
 121 #endif                          /* } */
 122 /* }================================================================== */
 123
 124
 125
 126
 127 static int os_execute (lua_State *L) {
 128   const char *cmd = luaL_optstring(L, 1, NULL);
 129   int stat = system(cmd);
 130   if (cmd != NULL)
 131     return luaL_execresult(L, stat);
 132   else {
 133     lua_pushboolean(L, stat);  /* true if there is a shell */
 134     return 1;
 135   }
 136 }
 137
 138
 139 static int os_remove (lua_State *L) {
 140   const char *filename = luaL_checkstring(L, 1);
 141   return luaL_fileresult(L, remove(filename) == 0, filename);
 142 }
 143
 144
 145 static int os_rename (lua_State *L) {
 146   const char *fromname = luaL_checkstring(L, 1);
 147   const char *toname = luaL_checkstring(L, 2);
 148   return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
 149 }
 150
 151
 152 static int os_tmpname (lua_State *L) {
 153   char buff[LUA_TMPNAMBUFSIZE];
 154   int err;
 155   lua_tmpnam(buff, err);
 156   if (err)
 157     return luaL_error(L, "unable to generate a unique filename");
 158   lua_pushstring(L, buff);
 159   return 1;
 160 }
 161
 162
 163 static int os_getenv (lua_State *L) {
 164   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
 165   return 1;
 166 }
 167
 168
 169 static int os_clock (lua_State *L) {
 170   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
 171   return 1;
 172 }
 173
 174
 175 /*
 176 ** {======================================================
 177 ** Time/Date operations
 178 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
 179 **   wday=%w+1, yday=%j, isdst=? }
 180 ** =======================================================
 181 */
 182
 183 static void setfield (lua_State *L, const char *key, int value) {
 184   lua_pushinteger(L, value);
 185   lua_setfield(L, -2, key);
 186 }
 187
 188 static void setboolfield (lua_State *L, const char *key, int value) {
 189   if (value < 0)  /* undefined? */
 190     return;  /* does not set field */
 191   lua_pushboolean(L, value);
 192   lua_setfield(L, -2, key);
 193 }
 194
 195 static int getboolfield (lua_State *L, const char *key) {
 196   int res;
 197   res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
 198   lua_pop(L, 1);
 199   return res;
 200 }
 201
 202
 203 static int getfield (lua_State *L, const char *key, int d) {
 204   int res, isnum;
 205   lua_getfield(L, -1, key);
 206   res = (int)lua_tointegerx(L, -1, &isnum);
 207   if (!isnum) {
 208     if (d < 0)
 209       return luaL_error(L, "field '%s' missing in date table", key);
 210     res = d;
 211   }
 212   lua_pop(L, 1);
 213   return res;
 214 }
 215
 216
 217 static const char *checkoption (lua_State *L, const char *conv, char *buff) {
 218   static const char *const options[] = LUA_STRFTIMEOPTIONS;
 219   unsigned int i;
 220   for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
 221     if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
 222       buff[1] = *conv;
 223       if (*options[i + 1] == '\0') {  /* one-char conversion specifier? */
 224         buff[2] = '\0';  /* end buffer */
 225         return conv + 1;
 226       }
 227       else if (*(conv + 1) != '\0' &&
 228                strchr(options[i + 1], *(conv + 1)) != NULL) {
 229         buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
 230         buff[3] = '\0';  /* end buffer */
 231         return conv + 2;
 232       }
 233     }
 234   }
 235   luaL_argerror(L, 1,
 236     lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
 237   return conv;  /* to avoid warnings */
 238 }
 239
 240
 241 static int os_date (lua_State *L) {
 242   const char *s = luaL_optstring(L, 1, "%c");
 243   time_t t = luaL_opt(L, l_checktime, 2, time(NULL));
 244   struct tm tmr, *stm;
 245   if (*s == '!') {  /* UTC? */
 246     stm = l_gmtime(&t, &tmr);
 247     s++;  /* skip '!' */
 248   }
 249   else
 250     stm = l_localtime(&t, &tmr);
 251   if (stm == NULL)  /* invalid date? */
 252     lua_pushnil(L);
 253   else if (strcmp(s, "*t") == 0) {
 254     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 255     setfield(L, "sec", stm->tm_sec);
 256     setfield(L, "min", stm->tm_min);
 257     setfield(L, "hour", stm->tm_hour);
 258     setfield(L, "day", stm->tm_mday);
 259     setfield(L, "month", stm->tm_mon+1);
 260     setfield(L, "year", stm->tm_year+1900);
 261     setfield(L, "wday", stm->tm_wday+1);
 262     setfield(L, "yday", stm->tm_yday+1);
 263     setboolfield(L, "isdst", stm->tm_isdst);
 264   }
 265   else {
 266     char cc[4];
 267     luaL_Buffer b;
 268     cc[0] = '%';
 269     luaL_buffinit(L, &b);
 270     while (*s) {
 271       if (*s != '%')  /* no conversion specifier? */
 272         luaL_addchar(&b, *s++);
 273       else {
 274         size_t reslen;
 275         char buff[200];  /* should be big enough for any conversion result */
 276         s = checkoption(L, s + 1, cc);
 277         reslen = strftime(buff, sizeof(buff), cc, stm);
 278         luaL_addlstring(&b, buff, reslen);
 279       }
 280     }
 281     luaL_pushresult(&b);
 282   }
 283   return 1;
 284 }
 285
 286
 287 static int os_time (lua_State *L) {
 288   time_t t;
 289   if (lua_isnoneornil(L, 1))  /* called without args? */
 290     t = time(NULL);  /* get current time */
 291   else {
 292     struct tm ts;
 293     luaL_checktype(L, 1, LUA_TTABLE);
 294     lua_settop(L, 1);  /* make sure table is at the top */
 295     ts.tm_sec = getfield(L, "sec", 0);
 296     ts.tm_min = getfield(L, "min", 0);
 297     ts.tm_hour = getfield(L, "hour", 12);
 298     ts.tm_mday = getfield(L, "day", -1);
 299     ts.tm_mon = getfield(L, "month", -1) - 1;
 300     ts.tm_year = getfield(L, "year", -1) - 1900;
 301     ts.tm_isdst = getboolfield(L, "isdst");
 302     t = mktime(&ts);
 303   }
 304   if (t != (time_t)(l_timet)t)
 305     luaL_error(L, "time result cannot be represented in this Lua installation");
 306   else if (t == (time_t)(-1))
 307     lua_pushnil(L);
 308   else
 309     l_pushtime(L, t);
 310   return 1;
 311 }
 312
 313
 314 static int os_difftime (lua_State *L) {
 315   time_t t1 = l_checktime(L, 1);
 316   time_t t2 = l_checktime(L, 2);
 317   lua_pushnumber(L, (lua_Number)difftime(t1, t2));
 318   return 1;
 319 }
 320
 321 /* }====================================================== */
 322
 323
 324 static int os_setlocale (lua_State *L) {
 325   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
 326                       LC_NUMERIC, LC_TIME};
 327   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
 328      "numeric", "time", NULL};
 329   const char *l = luaL_optstring(L, 1, NULL);
 330   int op = luaL_checkoption(L, 2, "all", catnames);
 331   lua_pushstring(L, setlocale(cat[op], l));
 332   return 1;
 333 }
 334
 335
 336 static int os_exit (lua_State *L) {
 337   int status;
 338   if (lua_isboolean(L, 1))
 339     status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
 340   else
 341     status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);
 342   if (lua_toboolean(L, 2))
 343     lua_close(L);
 344   if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
 345   return 0;
 346 }
 347
 348
 349 static const luaL_Reg syslib[] = {
 350   {"clock",     os_clock},
 351   {"date",      os_date},
 352   {"difftime",  os_difftime},
 353   {"execute",   os_execute},
 354   {"exit",      os_exit},
 355   {"getenv",    os_getenv},
 356   {"remove",    os_remove},
 357   {"rename",    os_rename},
 358   {"setlocale", os_setlocale},
 359   {"time",      os_time},
 360   {"tmpname",   os_tmpname},
 361   {NULL, NULL}
 362 };
 363
 364 /* }====================================================== */
 365
 366
 367
 368 LUAMOD_API int luaopen_os (lua_State *L) {
 369   luaL_newlib(L, syslib);
 370   return 1;
 371 }
 372