xref: /freebsd/contrib/unbound/compat/strsep.c (revision 3d6d3da45489fc5a3a3d3abf8117f34ab4633e35)

/**
 * strsep implementation for compatibility.
 *
  * LICENSE
  * Copyright (c) 2016, NLnet Labs
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  * * Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  * * 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.
  * * Neither the name of NLnetLabs nor the names of its
  *   contributors may be used to endorse or promote products derived from this
  *   software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 **/

#include "config.h"

/** see if character is in the delimiter array */
static int
in_delim(char c, const char* delim)
{
	const char* p;
	if(!delim)
		return 0;
	for(p=delim; *p; p++) {
		if(*p == c)
			return 1;
	}
	return 0;
}

char *strsep(char **stringp, const char *delim)
{
	char* s;
	char* orig;
	if(stringp == NULL || *stringp == NULL)
		return NULL;
	orig = *stringp;
	s = *stringp;
	while(*s && !in_delim(*s, delim))
		s++;
	if(*s) {
		*s = 0;
		*stringp = s+1;
	} else {
		*stringp = NULL;
	}
	return orig;
}