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new macro luaL_opt to avoid evaluating defaults when no needed

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Roberto Ierusalimschy
2005-10-21 11:47:42 -02:00
parent 9f4211310f
commit 053e873145
5 changed files with 17 additions and 21 deletions
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6
loslib.c
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@@ -1,5 +1,5 @@
/*
** $Id: loslib.c,v 1.12 2005/08/26 17:36:32 roberto Exp roberto $
** $Id: loslib.c,v 1.13 2005/09/09 18:22:46 roberto Exp roberto $
** Standard Operating System library
** See Copyright Notice in lua.h
*/
@@ -125,8 +125,8 @@ static int getfield (lua_State *L, const char *key, int d) {
static int io_date (lua_State *L) {
const char *s = luaL_optstring(L, 1, "%c");
lua_Number n = luaL_optnumber(L, 2, -1);
time_t t = (n == -1) ? time(NULL) : (time_t)n;
time_t t = lua_isnoneornil(L, 2) ? time(NULL) :
(time_t)luaL_checknumber(L, 2);
struct tm *stm;
if (*s == '!') { /* UTC? */
stm = gmtime(&t);