incubator-nuttx/libs/libc/wchar/lib_wmemcmp.c

75 lines
2.6 KiB
C

/****************************************************************************
* libs/libc/wchar/lib_wmemcmp.c
*
* Copyright (c)1999 Citrus Project,
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <string.h>
#include <wchar.h>
#ifdef CONFIG_LIBC_WCHAR
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: wmemcmp
*
* Description:
* The wmemcmp() function is the wide-character equivalent of the memcmp()
* function. It compares the n wide-characters starting at s1 and the n
* wide-characters starting at s2.
*
****************************************************************************/
int wmemcmp(FAR const wchar_t *s1, FAR const wchar_t *s2, size_t n)
{
size_t i;
for (i = 0; i < n; i++)
{
if (*s1 != *s2)
{
/* wchar might be unsigned */
return *s1 > *s2 ? 1 : -1;
}
s1++;
s2++;
}
return 0;
}
#endif