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| 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 |
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