/* $Id$ */
/* Copyright (c) 2007-2018 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System libc */
/* All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 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
 * HOLDER 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. */



#include "ctype.h"
#include "strings.h"


/* ffs */
int ffs(int i)
{
	const size_t bits = sizeof(i) * 8;
	size_t j;

	for(j = 0; j < bits; j++)
		if((i << (bits - j - 1)) != 0)
			return j;
	return 0;
}


/* strcasecmp */
int strcasecmp(char const * s1, char const * s2)
{
	unsigned char const * u1;
	unsigned char const * u2;

	u1 = (unsigned char const *)s1;
	u2 = (unsigned char const *)s2;
	while(*u1 && *u2 && tolower(*u1) == tolower(*u2))
	{
		u1++;
		u2++;
	}
	return *u1 - *u2;
}


/* strncasecmp */
int strncasecmp(char const * s1, char const * s2, size_t n)
{
	unsigned char const * u1;
	unsigned char const * u2;

	u1 = (unsigned char const *)s1;
	u2 = (unsigned char const *)s2;
	while(--n && *u1 && *u2 && tolower(*u1) == tolower(*u2))
	{
		u1++;
		u2++;
	}
	return *u1 - *u2;
}