usr/src/lib/libc/gen/gen.tahoe/strncmp.s

/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * This code is derived from software contributed to Berkeley by
 * Computer Consoles Inc.
 */

#if defined(LIBC_SCCS) && !defined(lint)
        .asciz "@(#)strncmp.s   1.3 (Berkeley) 6/27/88"
#endif /* LIBC_SCCS and not lint */

/*
 * Compare strings (at most n bytes):  s1>s2: >0  s1==s2: 0  s1<s2: <0
 *
 * strncmp(s1, s2, n)
 * register char *s1, *s2;
 * register n;
 */
#include "DEFS.h"

ENTRY(strncmp, 0)
        movl    12(fp),r2
        tstl    r2              /* number of bytes to compare */
        jgtr    n_ok
        clrl    r0
        ret                     /* for n <= 0 , s1 == s2 */
n_ok:
        movl    4(fp),r0
        movl    8(fp),r1
        cmps3
        jgtr    greater
        jlss    less
equal:  clrl    r0
        ret
less:   movl    $-1,r0
        ret
greater: movl   $1,r0
        ret