strsep.c

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/* strsep.h
 *
 *  Provides the 4.4BSD strsep(3) function for those that don't have it.
 *
 *  Copyright 2011 Michael Thomas Greer
 *  Distributed under the Boost Software License, Version 1.0.
 *  ( See accompanying file LICENSE_1_0.txt or copy at
 *   http://www.boost.org/LICENSE_1_0.txt )
 *
 *  Including this file modifies the std namespace in C++.
 *
 *  Don't include this file if your compiler provides the strsep function in <string.h>.
 *  Make sure your build process tests for this and behaves accordingly!
 *
 */

#include <string.h>

char *
strsep(char **stringp, const char *delim)
{
	char *result;

	if ((stringp == NULL) || (*stringp == NULL))
		return NULL;

	result = *stringp;

	while(**stringp && !(strchr(delim, **stringp)))
		++*stringp;

	if (**stringp)
		*(*stringp)++ = '\0';
	else
		*stringp = NULL;

	return result;
}