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new macro luaL_opt to avoid evaluating defaults when no needed

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This commit is contained in:
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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9
ltablib.c
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@@ -1,5 +1,5 @@
/*
** $Id: ltablib.c,v 1.35 2005/08/26 17:36:32 roberto Exp roberto $
** $Id: ltablib.c,v 1.36 2005/09/20 17:56:47 roberto Exp roberto $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
@@ -127,12 +127,11 @@ static int tremove (lua_State *L) {
static int tconcat (lua_State *L) {
luaL_Buffer b;
size_t lsep;
int i, last;
const char *sep = luaL_optlstring(L, 2, "", &lsep);
int i = luaL_optint(L, 3, 1);
int last = luaL_optint(L, 4, -2);
luaL_checktype(L, 1, LUA_TTABLE);
if (last == -2)
last = luaL_getn(L, 1);
i = luaL_optint(L, 3, 1);
last = luaL_opt(L, luaL_checkint, 4, luaL_getn(L, 1));
luaL_buffinit(L, &b);
for (; i <= last; i++) {
lua_rawgeti(L, 1, i);