Mercurial > gnulib
view lib/unistr/u16-strmblen.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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/* Look at first character in UTF-16 string. Copyright (C) 1999-2000, 2002, 2006-2007, 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" int u16_strmblen (const uint16_t *s) { /* Keep in sync with unistr.h and u16-mbtouc-aux.c. */ uint16_t c = *s; if (c < 0xd800 || c >= 0xe000) return (c != 0 ? 1 : 0); if (c < 0xdc00) { if (s[1] >= 0xdc00 && s[1] < 0xe000) return 2; } /* invalid or incomplete multibyte character */ return -1; }