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'table.sort' detects invalid order function before calling it

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for nil elements
This commit is contained in:
Roberto Ierusalimschy 2008-04-07 15:43:00 -03:00
parent 4d7469b610
commit ffdca3522e
1 changed files with 3 additions and 3 deletions
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6
ltablib.c
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@ -1,5 +1,5 @@
/*
** $Id: ltablib.c,v 1.42 2007/11/26 16:57:33 roberto Exp roberto $
** $Id: ltablib.c,v 1.43 2008/02/14 16:03:27 roberto Exp roberto $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
@ -215,12 +215,12 @@ static void auxsort (lua_State *L, int l, int u) {
for (;;) { /* invariant: a[l..i] <= P <= a[j..u] */
/* repeat ++i until a[i] >= P */
while (lua_rawgeti(L, 1, ++i), sort_comp(L, -1, -2)) {
if (i>u) luaL_error(L, "invalid order function for sorting");
if (i>=u) luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[i] */
}
/* repeat --j until a[j] <= P */
while (lua_rawgeti(L, 1, --j), sort_comp(L, -3, -1)) {
if (j<l) luaL_error(L, "invalid order function for sorting");
if (j<=l) luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[j] */
}
if (j<i) {