strncmp.c

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/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* $Id: strncmp.c,v 1.1.1.1 2005/04/21 14:56:06 beng Exp $ */

#include        <string.h>

int
strncmp(register const char *s1, register const char *s2, register size_t n)
{
        if (n) {
                do {
                        if (*s1 != *s2++)
                                break;
                        if (*s1++ == '\0')
                                return 0;
                } while (--n > 0);
                if (n > 0) {
                        if (*s1 == '\0') return -1;
                        if (*--s2 == '\0') return 1;
                        return (unsigned char) *s1 - (unsigned char) *s2;
                }
        }
        return 0;
}

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