88 lines
3.7 KiB
C
88 lines
3.7 KiB
C
/****************************************************************************
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* libc/string/lib_strtok.c
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*
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* Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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* Private Data
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****************************************************************************/
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static char *g_saveptr = NULL;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strtok
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*
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* Description:
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* The strtok() function parses a string into a
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* sequence of tokens. On the first call to strtok() the
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* string to be parsed should be specified in 'str'. In
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* each subsequent call that should parse the same string,
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* 'str' should be NULL.
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*
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* The 'delim' argument specifies a set of characters that
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* delimit the tokens in the parsed string. The caller
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* may specify different strings in delim in successive
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* calls that parse the same string.
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*
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* Each call to strtok() returns a pointer to a null-
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* terminated string containing the next token. This
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* string does not include the delimiting character. If
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* no more tokens are found, strtok() returns NULL.
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*
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* A sequence of two or more contiguous delimiter
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* characters in the parsed string is considered to be a
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* single delimiter. Delimiter characters at the start or
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* end of the string are ignored. The tokens returned by
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* strtok() are always non-empty strings.
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*
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* Return
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* strtok() returns a pointer to the next token, or NULL
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* if there are no more tokens.
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*
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****************************************************************************/
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char *strtok(char *str, const char *delim)
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{
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return strtok_r(str, delim, &g_saveptr);
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}
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