uclibc-ng/libc/string/strncasecmp.c

/* 
 * strncasecmp for uClibc
 * Copyright (C) 2002 by Brian Stafford <brian@stafford.uklinux.net>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program 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 Library General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <string.h>
#include <ctype.h>

int strncasecmp (const char *a, const char *b, size_t len)
{
    register int n;

    if (len < 1)
	return 0;
    while (*a == *b || (n = tolower (*a) - tolower (*b)) == 0)
    {
	if (*a == '\0' || --len < 1)
	    return 0;
	a++, b++;
    }
    return n;
}