usr/src/lib/libc/string/strncmp.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strncmp.c   5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>
#include <string.h>

int
strncmp(s1, s2, n)
        register const char *s1, *s2;
        register size_t n;
{

        if (n == 0)
                return (0);
        do {
                if (*s1 != *s2++)
                        return (*(unsigned char *)s1 - *(unsigned char *)--s2);
                if (*s1++ == 0)
                        break;
        } while (--n != 0);
        return (0);
}