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string.byte truncates indices out of range

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Roberto Ierusalimschy 2004-08-09 10:30:33 -03:00
parent c0fdaf5842
commit 9e6aa878c9
1 changed files with 4 additions and 3 deletions
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7
lstrlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lstrlib.c,v 1.104 2004/07/09 18:24:41 roberto Exp roberto $
** $Id: lstrlib.c,v 1.105 2004/08/06 17:35:38 roberto Exp roberto $
** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h
*/
@ -110,8 +110,9 @@ static int str_byte (lua_State *L) {
sint32 posi = posrelat(luaL_optinteger(L, 2, 1), l);
sint32 pose = posrelat(luaL_optinteger(L, 3, posi), l);
int n, i;
if (!(0 < posi && posi <= pose && (size_t)pose <= l))
return 0; /* index out of range; no answer */
if (posi <= 0) posi = 1;
if ((size_t)pose > l) pose = l;
if (posi > pose) return 0; /* empty interval; return no values */
n = pose - posi + 1;
luaL_checkstack(L, n, "string slice too long");
for (i=0; i<n; i++)