/*
 * $Id: string_strtok_r.c,v 1.4 2006-01-08 12:04:27 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * 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.
 *
 *   - Neither the name of Olaf Barthel nor the names of 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.
 */

#ifndef _STDLIB_NULL_POINTER_CHECK_H
#include "stdlib_null_pointer_check.h"
#endif /* _STDLIB_NULL_POINTER_CHECK_H */

/****************************************************************************/

#ifndef _STRING_HEADERS_H
#include "string_headers.h"
#endif /* _STRING_HEADERS_H */

/****************************************************************************/

char *
strtok_r(char *str, const char *separator_set,char ** state_ptr)
{
	char * result = NULL;
	char * last;
	size_t size;

	assert( separator_set != NULL && state_ptr != NULL );

	#if defined(CHECK_FOR_NULL_POINTERS)
	{
		if(separator_set == NULL || state_ptr == NULL)
		{
			__set_errno(EFAULT);
			goto out;
		}
	}
	#endif /* CHECK_FOR_NULL_POINTERS */

	last = (*state_ptr);

	/* Did we get called before? Restart at the last valid position. */
	if(str == NULL)
	{
		str = last;

		/* However, we may have hit the end of the
		   string already. */
		if(str == NULL)
			goto out;
	}

	last = NULL;

	/* Skip the characters which count as
	   separators. */
	str += strspn(str, separator_set);
	if((*str) == '\0')
		goto out;

	/* Count the number of characters which aren't
	   separators. */
	size = strcspn(str, separator_set);
	if(size == 0)
		goto out;

	/* This is where the search can resume later. */
	last = &str[size];

	/* If we didn't hit the end of the string already,
	   skip the separator. */
	if((*last) != '\0')
		last++;

	/* This is the token we found; make sure that
	   it looks like a valid string. */
	str[size] = '\0';

	result = str;

 out:

	if(state_ptr != NULL)
		(*state_ptr) = last;

	return(result);
}