2 ** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $
3 ** Standard Operating System library
4 ** See Copyright Notice in lua.h
23 static int os_pushresult (lua_State *L, int i, const char *filename) {
24 int en = errno; /* calls to Lua API may change this value */
26 lua_pushboolean(L, 1);
31 lua_pushfstring(L, "%s: %s", filename, strerror(en));
32 lua_pushinteger(L, en);
38 static int os_execute (lua_State *L) {
39 lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
44 static int os_remove (lua_State *L) {
45 const char *filename = luaL_checkstring(L, 1);
46 return os_pushresult(L, remove(filename) == 0, filename);
50 static int os_rename (lua_State *L) {
51 const char *fromname = luaL_checkstring(L, 1);
52 const char *toname = luaL_checkstring(L, 2);
53 return os_pushresult(L, rename(fromname, toname) == 0, fromname);
57 static int os_tmpname (lua_State *L) {
58 char buff[LUA_TMPNAMBUFSIZE];
60 lua_tmpnam(buff, err);
62 return luaL_error(L, "unable to generate a unique filename");
63 lua_pushstring(L, buff);
68 static int os_getenv (lua_State *L) {
69 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
74 static int os_clock (lua_State *L) {
75 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
81 ** {======================================================
82 ** Time/Date operations
83 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
84 ** wday=%w+1, yday=%j, isdst=? }
85 ** =======================================================
88 static void setfield (lua_State *L, const char *key, int value) {
89 lua_pushinteger(L, value);
90 lua_setfield(L, -2, key);
93 static void setboolfield (lua_State *L, const char *key, int value) {
94 if (value < 0) /* undefined? */
95 return; /* does not set field */
96 lua_pushboolean(L, value);
97 lua_setfield(L, -2, key);
100 static int getboolfield (lua_State *L, const char *key) {
102 lua_getfield(L, -1, key);
103 res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
109 static int getfield (lua_State *L, const char *key, int d) {
111 lua_getfield(L, -1, key);
112 if (lua_isnumber(L, -1))
113 res = (int)lua_tointeger(L, -1);
116 return luaL_error(L, "field " LUA_QS " missing in date table", key);
124 static int os_date (lua_State *L) {
125 const char *s = luaL_optstring(L, 1, "%c");
126 time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
128 if (*s == '!') { /* UTC? */
134 if (stm == NULL) /* invalid date? */
136 else if (strcmp(s, "*t") == 0) {
137 lua_createtable(L, 0, 9); /* 9 = number of fields */
138 setfield(L, "sec", stm->tm_sec);
139 setfield(L, "min", stm->tm_min);
140 setfield(L, "hour", stm->tm_hour);
141 setfield(L, "day", stm->tm_mday);
142 setfield(L, "month", stm->tm_mon+1);
143 setfield(L, "year", stm->tm_year+1900);
144 setfield(L, "wday", stm->tm_wday+1);
145 setfield(L, "yday", stm->tm_yday+1);
146 setboolfield(L, "isdst", stm->tm_isdst);
151 cc[0] = '%'; cc[2] = '\0';
152 luaL_buffinit(L, &b);
154 if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */
155 luaL_addchar(&b, *s);
158 char buff[200]; /* should be big enough for any conversion result */
160 reslen = strftime(buff, sizeof(buff), cc, stm);
161 luaL_addlstring(&b, buff, reslen);
170 static int os_time (lua_State *L) {
172 if (lua_isnoneornil(L, 1)) /* called without args? */
173 t = time(NULL); /* get current time */
176 luaL_checktype(L, 1, LUA_TTABLE);
177 lua_settop(L, 1); /* make sure table is at the top */
178 ts.tm_sec = getfield(L, "sec", 0);
179 ts.tm_min = getfield(L, "min", 0);
180 ts.tm_hour = getfield(L, "hour", 12);
181 ts.tm_mday = getfield(L, "day", -1);
182 ts.tm_mon = getfield(L, "month", -1) - 1;
183 ts.tm_year = getfield(L, "year", -1) - 1900;
184 ts.tm_isdst = getboolfield(L, "isdst");
187 if (t == (time_t)(-1))
190 lua_pushnumber(L, (lua_Number)t);
195 static int os_difftime (lua_State *L) {
196 lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
197 (time_t)(luaL_optnumber(L, 2, 0))));
201 /* }====================================================== */
204 static int os_setlocale (lua_State *L) {
205 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
206 LC_NUMERIC, LC_TIME};
207 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
208 "numeric", "time", NULL};
209 const char *l = luaL_optstring(L, 1, NULL);
210 int op = luaL_checkoption(L, 2, "all", catnames);
211 lua_pushstring(L, setlocale(cat[op], l));
216 static int os_exit (lua_State *L) {
217 exit(luaL_optint(L, 1, EXIT_SUCCESS));
220 static const luaL_Reg syslib[] = {
223 {"difftime", os_difftime},
224 {"execute", os_execute},
226 {"getenv", os_getenv},
227 {"remove", os_remove},
228 {"rename", os_rename},
229 {"setlocale", os_setlocale},
231 {"tmpname", os_tmpname},
235 /* }====================================================== */
239 LUALIB_API int luaopen_os (lua_State *L) {
240 luaL_register(L, LUA_OSLIBNAME, syslib);