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better way to test overflows with string indices

This commit is contained in:
Roberto Ierusalimschy 2011-06-09 15:22:47 -03:00
parent 35391d9b1a
commit c9d1d9f9c6
1 changed files with 2 additions and 2 deletions
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4
lstrlib.c
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@ -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 ** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h ** 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 */ /* translate a relative string position: negative means back from end */
static size_t posrelat (ptrdiff_t pos, size_t len) { static size_t posrelat (ptrdiff_t pos, size_t len) {
if (pos >= 0) return (size_t)pos; 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; else return len - ((size_t)-pos) + 1;
} }