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 #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 } 323 324
