/*
 * Copyright (c) 2011, 2012, 2014 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/strspn.c
 * Search a string for a set of characters.
 */

#include <stdbool.h>
#include <string.h>

size_t strspn(const char* str, const char* accept)
{
	size_t accept_length = 0;
	while ( accept[accept_length] )
		accept_length++;
	for ( size_t result = 0; true; result++ )
	{
		char c = str[result];
		if ( !c )
			return result;
		bool matches = false;
		for ( size_t i = 0; i < accept_length; i++ )
		{
			if ( str[result] != accept[i] )
				continue;
			matches = true;
			break;
		}
		if ( !matches )
			return result;
	}
}
