81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/string/lib_strxfrm.c
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*
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* SPDX-License-Identifier: BSD-2-Clause
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* SPDX-FileCopyrightText: 1999 Citrus Project, All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#ifdef CONFIG_LIBC_LOCALE
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strxfrm
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*
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* Description:
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* This function transforms the string pointed to by s2 and places the
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* resulting string into the array pointed to by s1. The transformation is
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* such that if the strcmp() function is applied to the two transformed
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* strings, it returns a value greater than, equal to, or less than zero,
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* corresponding to the result of a <<strcoll>> function applied to the
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* same two original strings.
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* With a C locale, this function just copies.
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*
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****************************************************************************/
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size_t strxfrm(FAR char *s1, FAR const char *s2, size_t n)
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{
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size_t res;
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res = 0;
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while (n-- > 0)
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{
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if ((*s1++ = *s2++) != '\0')
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{
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++res;
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}
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else
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{
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return res;
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}
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}
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while (*s2 != '\0')
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{
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++s2;
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++res;
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}
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return res;
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}
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#endif
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