57419a9b19
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5396 42af7a65-404d-4744-a932-0658087f49c3
75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/************************************************************
|
|
* libc/string/lib_memcmp.c
|
|
*
|
|
* Copyright (C) 2007, 2011-2012 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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 NuttX 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.
|
|
*
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Compilation Switches
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Included Files
|
|
************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <sys/types.h>
|
|
#include <string.h>
|
|
|
|
/************************************************************
|
|
* Global Functions
|
|
************************************************************/
|
|
|
|
#ifndef CONFIG_ARCH_MEMCMP
|
|
int memcmp(FAR const void *s1, FAR const void *s2, size_t n)
|
|
{
|
|
unsigned char *p1 = (unsigned char *)s1;
|
|
unsigned char *p2 = (unsigned char *)s2;
|
|
|
|
while (n-- > 0)
|
|
{
|
|
if (*p1 < *p2)
|
|
{
|
|
return -1;
|
|
}
|
|
else if (*p1 > *p2)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
p1++;
|
|
p2++;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|