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'posrelat' avoids problems with -(-2^31)

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Roberto Ierusalimschy
2008-06-12 11:21:18 -03:00
parent 92a0d4c67f
commit b1203e036d
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 1.139 2007/11/12 14:10:09 roberto Exp roberto $ ** $Id: lstrlib.c,v 1.140 2008/04/14 15:54:59 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
*/ */
@@ -36,7 +36,7 @@ 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 ((size_t)-pos > len) return 0; else if (pos == -pos || (size_t)-pos > len) return 0;
else return len - ((size_t)-pos) + 1; else return len - ((size_t)-pos) + 1;
} }