81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
|
/****************************************************************************
|
||
|
|
* libc/string/lib_strxfrm.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>
|
||
|
|
|
||
|
|
#ifdef CONFIG_LIBC_LOCALE
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Public Functions
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Name: strxfrm
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* This function transforms the string pointed to by s2 and places the
|
||
|
|
* resulting string into the array pointed to by s1. The transformation is
|
||
|
|
* such that if the strcmp() function is applied to the two transformed
|
||
|
|
* strings, it returns a value greater than, equal to, or less than zero,
|
||
|
|
* correspoinding to the result of a <<strcoll>> function applied to the
|
||
|
|
* same two original strings.
|
||
|
|
* With a C locale, this function just copies.
|
||
|
|
*
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
size_t strxfrm(FAR char *s1, FAR const char *s2, size_t n)
|
||
|
|
{
|
||
|
|
size_t res;
|
||
|
|
res = 0;
|
||
|
|
while (n-- > 0)
|
||
|
|
{
|
||
|
|
if ((*s1++ = *s2++) != '\0')
|
||
|
|
{
|
||
|
|
++res;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
while (*s2)
|
||
|
|
{
|
||
|
|
++s2;
|
||
|
|
++res;
|
||
|
|
}
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
#endif
|