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commit c9d1d9f9c6ce513c048eb85b99936ee241e5cd3b
parent 35391d9b1aab036f37799458236e0ea0ca4a4d3f
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date:   Thu,  9 Jun 2011 15:22:23 -0300

better way to test overflows with string indices

Diffstat:
Mlstrlib.c | 4++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lstrlib.c b/lstrlib.c @@ -1,5 +1,5 @@ /* -** $Id: lstrlib.c,v 1.166 2011/04/20 16:36:28 roberto Exp roberto $ +** $Id: lstrlib.c,v 1.167 2011/05/03 16:01:57 roberto Exp roberto $ ** Standard library for string operations and pattern-matching ** See Copyright Notice in lua.h */ @@ -45,7 +45,7 @@ static int str_len (lua_State *L) { /* translate a relative string position: negative means back from end */ static size_t posrelat (ptrdiff_t pos, size_t len) { if (pos >= 0) return (size_t)pos; - else if (pos == -pos || (size_t)-pos > len) return 0; + else if (-(size_t)pos > len) return 0; else return len - ((size_t)-pos) + 1; }