lib/common/strncasecmp.c

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/* $Id$ $Revision$ */
/* vim:set shiftwidth=4 ts=8: */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: See CVS logs. Details at http://www.graphviz.org/
 *************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif


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

int strncasecmp(const char *s1, const char *s2, unsigned int n)
{
    if (n == 0)
        return 0;

    while ((n-- != 0)
           && (tolower(*(unsigned char *) s1) ==
               tolower(*(unsigned char *) s2))) {
        if (n == 0 || *s1 == '\0' || *s2 == '\0')
            return 0;
        s1++;
        s2++;
    }

    return tolower(*(unsigned char *) s1) - tolower(*(unsigned char *) s2);
}