Mercurial > gnulib
view lib/unistr/u32-strrchr.c @ 40211:5f58d2ac35ea
unistr/u8-cmp: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u8-cmp.c (u8_cmp): Don't invoke memcmp if n is zero.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 08 Mar 2019 20:38:22 +0100 |
parents | b06060465f09 |
children |
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/* Search character in UTF-32 string. Copyright (C) 1999, 2002, 2006, 2009-2019 Free Software Foundation, Inc. Written by Bruno Haible <bruno@clisp.org>, 2002. This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include "unistr.h" uint32_t * u32_strrchr (const uint32_t *s, ucs4_t uc) { /* Calling u32_strlen and then searching from the other end would cause more memory accesses. Avoid that, at the cost of a few more comparisons. */ uint32_t *result = NULL; for (;; s++) { if (*s == uc) result = (uint32_t *) s; if (*s == 0) break; } return result; }