1 /* 2 ** $Id: loslib.c,v 1.40.1.1 2013/04/12 18:48:47 roberto Exp $ 3 ** Standard Operating System library 4 ** See Copyright Notice in lua.h 5 */ 6 7 8 #include <errno.h> 9 #ifndef SYSLINUX 10 #include <locale.h> 11 #endif 12 #include <stdlib.h> 13 #include <string.h> 14 #include <time.h> 15 16 #define loslib_c 17 #define LUA_LIB 18 19 #include "lua.h" 20 21 #include "lauxlib.h" 22 #include "lualib.h" 23 24 25 #ifndef SYSLINUX 26 /* 27 ** list of valid conversion specifiers for the 'strftime' function 28 */ 29 #if !defined(LUA_STRFTIMEOPTIONS) 30 31 #if !defined(LUA_USE_POSIX) 32 #define LUA_STRFTIMEOPTIONS { "aAbBcdHIjmMpSUwWxXyYz%", "" } 33 #else 34 #define LUA_STRFTIMEOPTIONS \ 35 { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "" \ 36 "", "E", "cCxXyY", \ 37 "O", "deHImMSuUVwWy" } 38 #endif 39 40 #endif 41 42 43 44 /* 45 ** By default, Lua uses tmpnam except when POSIX is available, where it 46 ** uses mkstemp. 47 */ 48 #if defined(LUA_USE_MKSTEMP) 49 #include <unistd.h> 50 #define LUA_TMPNAMBUFSIZE 32 51 #define lua_tmpnam(b,e) { \ 52 strcpy(b, "/tmp/lua_XXXXXX"); \ 53 e = mkstemp(b); \ 54 if (e != -1) close(e); \ 55 e = (e == -1); } 56 57 #elif !defined(lua_tmpnam) 58 59 #define LUA_TMPNAMBUFSIZE L_tmpnam 60 #define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); } 61 62 #endif 63 64 65 /* 66 ** By default, Lua uses gmtime/localtime, except when POSIX is available, 67 ** where it uses gmtime_r/localtime_r 68 */ 69 #if defined(LUA_USE_GMTIME_R) 70 71 #define l_gmtime(t,r) gmtime_r(t,r) 72 #define l_localtime(t,r) localtime_r(t,r) 73 74 #elif !defined(l_gmtime) 75 76 #define l_gmtime(t,r) ((void)r, gmtime(t)) 77 #define l_localtime(t,r) ((void)r, localtime(t)) 78 79 #endif 80 81 82 83 static int os_execute (lua_State *L) { 84 const char *cmd = luaL_optstring(L, 1, NULL); 85 int stat = system(cmd); 86 if (cmd != NULL) 87 return luaL_execresult(L, stat); 88 else { 89 lua_pushboolean(L, stat); /* true if there is a shell */ 90 return 1; 91 } 92 } 93 94 95 static int os_remove (lua_State *L) { 96 const char *filename = luaL_checkstring(L, 1); 97 return luaL_fileresult(L, remove(filename) == 0, filename); 98 } 99 100 101 static int os_rename (lua_State *L) { 102 const char *fromname = luaL_checkstring(L, 1); 103 const char *toname = luaL_checkstring(L, 2); 104 return luaL_fileresult(L, rename(fromname, toname) == 0, NULL); 105 } 106 107 108 static int os_tmpname (lua_State *L) { 109 char buff[LUA_TMPNAMBUFSIZE]; 110 int err; 111 lua_tmpnam(buff, err); 112 if (err) 113 return luaL_error(L, "unable to generate a unique filename"); 114 lua_pushstring(L, buff); 115 return 1; 116 } 117 #endif /* SYSLINUX */ 118 119 120 static int os_getenv (lua_State *L) { 121 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */ 122 return 1; 123 } 124 125 126 #ifndef SYSLINUX 127 static int os_clock (lua_State *L) { 128 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC); 129 return 1; 130 } 131 132 133 /* 134 ** {====================================================== 135 ** Time/Date operations 136 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S, 137 ** wday=%w+1, yday=%j, isdst=? } 138 ** ======================================================= 139 */ 140 141 static void setfield (lua_State *L, const char *key, int value) { 142 lua_pushinteger(L, value); 143 lua_setfield(L, -2, key); 144 } 145 146 static void setboolfield (lua_State *L, const char *key, int value) { 147 if (value < 0) /* undefined? */ 148 return; /* does not set field */ 149 lua_pushboolean(L, value); 150 lua_setfield(L, -2, key); 151 } 152 153 static int getboolfield (lua_State *L, const char *key) { 154 int res; 155 lua_getfield(L, -1, key); 156 res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1); 157 lua_pop(L, 1); 158 return res; 159 } 160 161 162 static int getfield (lua_State *L, const char *key, int d) { 163 int res, isnum; 164 lua_getfield(L, -1, key); 165 res = (int)lua_tointegerx(L, -1, &isnum); 166 if (!isnum) { 167 if (d < 0) 168 return luaL_error(L, "field " LUA_QS " missing in date table", key); 169 res = d; 170 } 171 lua_pop(L, 1); 172 return res; 173 } 174 175 176 static const char *checkoption (lua_State *L, const char *conv, char *buff) { 177 static const char *const options[] = LUA_STRFTIMEOPTIONS; 178 unsigned int i; 179 for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) { 180 if (*conv != '\0' && strchr(options[i], *conv) != NULL) { 181 buff[1] = *conv; 182 if (*options[i + 1] == '\0') { /* one-char conversion specifier? */ 183 buff[2] = '\0'; /* end buffer */ 184 return conv + 1; 185 } 186 else if (*(conv + 1) != '\0' && 187 strchr(options[i + 1], *(conv + 1)) != NULL) { 188 buff[2] = *(conv + 1); /* valid two-char conversion specifier */ 189 buff[3] = '\0'; /* end buffer */ 190 return conv + 2; 191 } 192 } 193 } 194 luaL_argerror(L, 1, 195 lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv)); 196 return conv; /* to avoid warnings */ 197 } 198 199 200 static int os_date (lua_State *L) { 201 const char *s = luaL_optstring(L, 1, "%c"); 202 time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL)); 203 struct tm tmr, *stm; 204 if (*s == '!') { /* UTC? */ 205 stm = l_gmtime(&t, &tmr); 206 s++; /* skip `!' */ 207 } 208 else 209 stm = l_localtime(&t, &tmr); 210 if (stm == NULL) /* invalid date? */ 211 lua_pushnil(L); 212 else if (strcmp(s, "*t") == 0) { 213 lua_createtable(L, 0, 9); /* 9 = number of fields */ 214 setfield(L, "sec", stm->tm_sec); 215 setfield(L, "min", stm->tm_min); 216 setfield(L, "hour", stm->tm_hour); 217 setfield(L, "day", stm->tm_mday); 218 setfield(L, "month", stm->tm_mon+1); 219 setfield(L, "year", stm->tm_year+1900); 220 setfield(L, "wday", stm->tm_wday+1); 221 setfield(L, "yday", stm->tm_yday+1); 222 setboolfield(L, "isdst", stm->tm_isdst); 223 } 224 else { 225 char cc[4]; 226 luaL_Buffer b; 227 cc[0] = '%'; 228 luaL_buffinit(L, &b); 229 while (*s) { 230 if (*s != '%') /* no conversion specifier? */ 231 luaL_addchar(&b, *s++); 232 else { 233 size_t reslen; 234 char buff[200]; /* should be big enough for any conversion result */ 235 s = checkoption(L, s + 1, cc); 236 reslen = strftime(buff, sizeof(buff), cc, stm); 237 luaL_addlstring(&b, buff, reslen); 238 } 239 } 240 luaL_pushresult(&b); 241 } 242 return 1; 243 } 244 245 246 static int os_time (lua_State *L) { 247 time_t t; 248 if (lua_isnoneornil(L, 1)) /* called without args? */ 249 t = time(NULL); /* get current time */ 250 else { 251 struct tm ts; 252 luaL_checktype(L, 1, LUA_TTABLE); 253 lua_settop(L, 1); /* make sure table is at the top */ 254 ts.tm_sec = getfield(L, "sec", 0); 255 ts.tm_min = getfield(L, "min", 0); 256 ts.tm_hour = getfield(L, "hour", 12); 257 ts.tm_mday = getfield(L, "day", -1); 258 ts.tm_mon = getfield(L, "month", -1) - 1; 259 ts.tm_year = getfield(L, "year", -1) - 1900; 260 ts.tm_isdst = getboolfield(L, "isdst"); 261 t = mktime(&ts); 262 } 263 if (t == (time_t)(-1)) 264 lua_pushnil(L); 265 else 266 lua_pushnumber(L, (lua_Number)t); 267 return 1; 268 } 269 270 271 #ifndef LUA_NUMBER_INTEGRAL 272 static int os_difftime (lua_State *L) { 273 lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)), 274 (time_t)(luaL_optnumber(L, 2, 0)))); 275 return 1; 276 } 277 #endif 278 279 /* }====================================================== */ 280 281 282 static int os_setlocale (lua_State *L) { 283 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, 284 LC_NUMERIC, LC_TIME}; 285 static const char *const catnames[] = {"all", "collate", "ctype", "monetary", 286 "numeric", "time", NULL}; 287 const char *l = luaL_optstring(L, 1, NULL); 288 int op = luaL_checkoption(L, 2, "all", catnames); 289 lua_pushstring(L, setlocale(cat[op], l)); 290 return 1; 291 } 292 #endif /* SYSLINUX */ 293 294 295 static int os_exit (lua_State *L) { 296 int status; 297 if (lua_isboolean(L, 1)) 298 status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE); 299 else 300 status = luaL_optint(L, 1, EXIT_SUCCESS); 301 if (lua_toboolean(L, 2)) 302 lua_close(L); 303 if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */ 304 return 0; 305 } 306 307 308 static const luaL_Reg syslib[] = { 309 #ifndef SYSLINUX 310 {"clock", os_clock}, 311 {"date", os_date}, 312 #ifndef LUA_NUMBER_INTEGRAL 313 {"difftime", os_difftime}, 314 #endif 315 {"execute", os_execute}, 316 #endif 317 {"exit", os_exit}, 318 {"getenv", os_getenv}, 319 #ifndef SYSLINUX 320 {"remove", os_remove}, 321 {"rename", os_rename}, 322 {"setlocale", os_setlocale}, 323 {"time", os_time}, 324 {"tmpname", os_tmpname}, 325 #endif 326 {NULL, NULL} 327 }; 328 329 /* }====================================================== */ 330 331 332 333 LUAMOD_API int luaopen_os (lua_State *L) { 334 luaL_newlib(L, syslib); 335 return 1; 336 } 337 338
