| 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 | |