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/* ****************************************************************************
 * string/memchr.c -- Look for a character in a memory area.
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of the 'all/core' module,
 * in libcarrot, an experimental modular libc project.
 *
 * This file is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This file is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Lesser Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this file.  If not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#include <string.h>

/**
 *	memchr:
 *	Search a character in a memory area.
 *
 *	@arg	s		a pointer to the memory area.
 *	@arg	c		the character.
 *	@arg	n		the length of the area.
 *	@return			either the pointer to the found character, or NULL if not.
 */

void *memchr(const void *s, int c, size_t n)
{
	const unsigned char *us = (const void*)s;
	while (n-- && *us != c) us++;
	return ((void*)us);
}