/* ** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $ ** Standard Operating System library ** See Copyright Notice in lua.h */ #include #include #include #include #include #define loslib_c #define LUA_LIB #include "lua.h" #include "lauxlib.h" #include "lualib.h" /* ** {====================================================== ** Time/Date operations ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S, ** wday=%w+1, yday=%j, isdst=? } ** ======================================================= */ static void setfield (lua_State *L, const char *key, int value) { lua_pushinteger(L, value); lua_setfield(L, -2, key); } static void setboolfield (lua_State *L, const char *key, int value) { if (value < 0) /* undefined? */ return; /* does not set field */ lua_pushboolean(L, value); lua_setfield(L, -2, key); } static int getboolfield (lua_State *L, const char *key) { int res; lua_getfield(L, -1, key); res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1); lua_pop(L, 1); return res; } static int getfield (lua_State *L, const char *key, int d) { int res; lua_getfield(L, -1, key); if (lua_isnumber(L, -1)) res = (int)lua_tointeger(L, -1); else { if (d < 0) return luaL_error(L, "field " LUA_QS " missing in date table", key); res = d; } lua_pop(L, 1); return res; } static int os_date (lua_State *L) { const char *s = luaL_optstring(L, 1, "%c"); time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL)); struct tm *stm; if (*s == '!') { /* UTC? */ stm = gmtime(&t); s++; /* skip `!' */ } else stm = localtime(&t); if (stm == NULL) /* invalid date? */ lua_pushnil(L); else if (strcmp(s, "*t") == 0) { lua_createtable(L, 0, 9); /* 9 = number of fields */ setfield(L, "sec", stm->tm_sec); setfield(L, "min", stm->tm_min); setfield(L, "hour", stm->tm_hour); setfield(L, "day", stm->tm_mday); setfield(L, "month", stm->tm_mon+1); setfield(L, "year", stm->tm_year+1900); setfield(L, "wday", stm->tm_wday+1); setfield(L, "yday", stm->tm_yday+1); setboolfield(L, "isdst", stm->tm_isdst); } else { char cc[3]; luaL_Buffer b; cc[0] = '%'; cc[2] = '\0'; luaL_buffinit(L, &b); for (; *s; s++) { if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */ luaL_addchar(&b, *s); else { size_t reslen; char buff[200]; /* should be big enough for any conversion result */ cc[1] = *(++s); reslen = strftime(buff, sizeof(buff), cc, stm); luaL_addlstring(&b, buff, reslen); } } luaL_pushresult(&b); } return 1; } static int os_time (lua_State *L) { time_t t; if (lua_isnoneornil(L, 1)) /* called without args? */ t = time(NULL); /* get current time */ else { struct tm ts; luaL_checktype(L, 1, LUA_TTABLE); lua_settop(L, 1); /* make sure table is at the top */ ts.tm_sec = getfield(L, "sec", 0); ts.tm_min = getfield(L, "min", 0); ts.tm_hour = getfield(L, "hour", 12); ts.tm_mday = getfield(L, "day", -1); ts.tm_mon = getfield(L, "month", -1) - 1; ts.tm_year = getfield(L, "year", -1) - 1900; ts.tm_isdst = getboolfield(L, "isdst"); t = mktime(&ts); } if (t == (time_t)(-1)) lua_pushnil(L); else lua_pushnumber(L, (lua_Number)t); return 1; } static int os_difftime (lua_State *L) { lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)), (time_t)(luaL_optnumber(L, 2, 0)))); return 1; } /* }====================================================== */ static const luaL_Reg syslib[] = { {"date", os_date}, {"difftime", os_difftime}, {"time", os_time}, {NULL, NULL} }; /* }====================================================== */ LUALIB_API int luaopen_myos (lua_State *L) { #if LUA_VERSION_NUM >= 502 luaL_newlib(L, syslib); #else luaL_register(L, LUA_OSLIBNAME, syslib); #endif return 1; }