83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/****************************************************************************
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* libs/libc/string/lib_strsep.c
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*
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* Copyright (C) 2019 Pinecone Inc. All rights reserved.
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* Author: Xiang Xiao <xiaoxiang@pinecon.net>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF 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 <string.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strsep
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*
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* Description:
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* If *strp is NULL, the strsep() function returns NULL and does
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* nothing else. Otherwise, this function finds the first token in the
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* string *strp, that is delimited by one of the bytes in the string
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* delim. This token is terminated by overwriting the delimiter with a
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* null byte ('\0'), and *strp is updated to point past the token.
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* In case no delimiter was found, the token is taken to be the entire
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* string *strp, and *strp is made NULL.
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*
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* Returned Value:
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* The strsep() function returns a pointer to the token, that is, it
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* returns the original value of *strp.
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*
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****************************************************************************/
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FAR char *strsep(FAR char **strp, FAR const char *delim)
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{
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FAR char *sbegin = *strp;
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FAR char *end;
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if (sbegin == NULL)
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{
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return NULL;
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}
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end = strpbrk(sbegin, delim);
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if (end != NULL)
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{
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*end++ = '\0';
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}
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*strp = end;
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return sbegin;
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}
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