sortix--sortix/libc/string/strtok_r.c

/*
 * Copyright (c) 2011, 2012 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * string/strtok_r.c
 * Extract tokens from strings.
 */

#include <string.h>

char* strtok_r(char* str, const char* delim, char** saveptr)
{
	if ( !str && !*saveptr )
		return NULL;
	if ( !str )
		str = *saveptr;
	str += strspn(str, delim); // Skip leading
	if ( !*str )
		return *saveptr = NULL;
	size_t amount = strcspn(str, delim);
	if ( str[amount] )
		*saveptr = str + amount + 1;
	else
		*saveptr = NULL;
	str[amount] = '\0';
	return str;
}