From 45b2c26ebf5866d44a4d780de8e767b127174f76 Mon Sep 17 00:00:00 2001 From: ian Date: Mon, 17 Jul 2023 05:20:45 +0000 Subject: kernel/lib: Add memcmp() git-svn-id: https://svn.vegaa.systems/svn/vega-Vega/trunk@25 a8a8aea2-181d-ee11-89e8-15fd0e089fc4 --- sys/lib/string/memcmp.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 sys/lib/string/memcmp.c (limited to 'sys/lib') diff --git a/sys/lib/string/memcmp.c b/sys/lib/string/memcmp.c new file mode 100644 index 0000000..6d8afcd --- /dev/null +++ b/sys/lib/string/memcmp.c @@ -0,0 +1,47 @@ +/* + * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of VegaOS nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* $Id */ + +#include + +int +memcmp(const void *s1, const void *s2, size_t n) +{ + if (n != 0) { + const unsigned char *p1 = s1, *p2 = s2; + + do { + if (*p1++ != *p2++) { + return (*--p1 - *--p2); + } + } while (--n != 0); + } + return 0; +} -- cgit v1.2.3