git.zerfleddert.de Git - proxmark3-svn/blob - 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       }
 181       else if (*(conv + 1) != '\0' &&
 182                strchr(options[i + 1], *(conv + 1)) != NULL) {
 183         buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
 184         buff[3] = '\0';  /* end buffer */
 185         return conv + 2;
 186       }
 187     }
 188   }
 189   luaL_argerror(L, 1,
 190     lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
 191   return conv;  /* to avoid warnings */
 192 }
 193
 194
 195 static int os_date (lua_State *L) {
 196   const char *s = luaL_optstring(L, 1, "%c");
 197   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
 198   struct tm tmr, *stm;
 199   if (*s == '!') {  /* UTC? */
 200     stm = l_gmtime(&t, &tmr);
 201     s++;  /* skip `!' */
 202   }
 203   else
 204     stm = l_localtime(&t, &tmr);
 205   if (stm == NULL)  /* invalid date? */
 206     lua_pushnil(L);
 207   else if (strcmp(s, "*t") == 0) {
 208     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 209     setfield(L, "sec", stm->tm_sec);
 210     setfield(L, "min", stm->tm_min);
 211     setfield(L, "hour", stm->tm_hour);
 212     setfield(L, "day", stm->tm_mday);
 213     setfield(L, "month", stm->tm_mon+1);
 214     setfield(L, "year", stm->tm_year+1900);
 215     setfield(L, "wday", stm->tm_wday+1);
 216     setfield(L, "yday", stm->tm_yday+1);
 217     setboolfield(L, "isdst", stm->tm_isdst);
 218   }
 219   else {
 220     char cc[4];
 221     luaL_Buffer b;
 222     cc[0] = '%';
 223     luaL_buffinit(L, &b);
 224     while (*s) {
 225       if (*s != '%')  /* no conversion specifier? */
 226         luaL_addchar(&b, *s++);
 227       else {
 228         size_t reslen;
 229         char buff[200];  /* should be big enough for any conversion result */
 230         s = checkoption(L, s + 1, cc);
 231         reslen = strftime(buff, sizeof(buff), cc, stm);
 232         luaL_addlstring(&b, buff, reslen);
 233       }
 234     }
 235     luaL_pushresult(&b);
 236   }
 237   return 1;
 238 }
 239
 240
 241 static int os_time (lua_State *L) {
 242   time_t t;
 243   if (lua_isnoneornil(L, 1))  /* called without args? */
 244     t = time(NULL);  /* get current time */
 245   else {
 246     struct tm ts;
 247     luaL_checktype(L, 1, LUA_TTABLE);
 248     lua_settop(L, 1);  /* make sure table is at the top */
 249     ts.tm_sec = getfield(L, "sec", 0);
 250     ts.tm_min = getfield(L, "min", 0);
 251     ts.tm_hour = getfield(L, "hour", 12);
 252     ts.tm_mday = getfield(L, "day", -1);
 253     ts.tm_mon = getfield(L, "month", -1) - 1;
 254     ts.tm_year = getfield(L, "year", -1) - 1900;
 255     ts.tm_isdst = getboolfield(L, "isdst");
 256     t = mktime(&ts);
 257   }
 258   if (t == (time_t)(-1))
 259     lua_pushnil(L);
 260   else
 261     lua_pushnumber(L, (lua_Number)t);
 262   return 1;
 263 }
 264
 265
 266 static int os_difftime (lua_State *L) {
 267   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
 268                              (time_t)(luaL_optnumber(L, 2, 0))));
 269   return 1;
 270 }
 271
 272 /* }====================================================== */
 273
 274
 275 static int os_setlocale (lua_State *L) {
 276   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
 277                       LC_NUMERIC, LC_TIME};
 278   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
 279      "numeric", "time", NULL};
 280   const char *l = luaL_optstring(L, 1, NULL);
 281   int op = luaL_checkoption(L, 2, "all", catnames);
 282   lua_pushstring(L, setlocale(cat[op], l));
 283   return 1;
 284 }
 285
 286
 287 static int os_exit (lua_State *L) {
 288   int status;
 289   if (lua_isboolean(L, 1))
 290     status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
 291   else
 292     status = luaL_optint(L, 1, EXIT_SUCCESS);
 293   if (lua_toboolean(L, 2))
 294     lua_close(L);
 295   if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
 296   return 0;
 297 }
 298
 299
 300 static const luaL_Reg syslib[] = {
 301   {"clock",     os_clock},
 302   {"date",      os_date},
 303   {"difftime",  os_difftime},
 304   {"execute",   os_execute},
 305   {"exit",      os_exit},
 306   {"getenv",    os_getenv},
 307   {"remove",    os_remove},
 308   {"rename",    os_rename},
 309   {"setlocale", os_setlocale},
 310   {"time",      os_time},
 311   {"tmpname",   os_tmpname},
 312   {NULL, NULL}
 313 };
 314
 315 /* }====================================================== */
 316
 317
 318
 319 LUAMOD_API int luaopen_os (lua_State *L) {
 320   luaL_newlib(L, syslib);
 321   return 1;
 322 }
 323