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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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10
lbaselib.c
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@@ -1,5 +1,5 @@
/*
** $Id: lbaselib.c,v 1.184 2005/10/03 14:36:45 roberto Exp roberto $
** $Id: lbaselib.c,v 1.185 2005/10/20 11:35:50 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
@@ -340,12 +340,10 @@ static int luaB_assert (lua_State *L) {
static int luaB_unpack (lua_State *L) {
int i = luaL_optint(L, 2, 1);
int e = luaL_optint(L, 3, -1);
int n;
int i, e, n;
luaL_checktype(L, 1, LUA_TTABLE);
if (e == -1)
e = luaL_getn(L, 1);
i = luaL_optint(L, 2, 1);
e = luaL_opt(L, luaL_checkint, 3, luaL_getn(L, 1));
n = e - i + 1; /* number of elements */
if (n <= 0) return 0; /* empty range */
luaL_checkstack(L, n, "table too big to unpack");