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Annotation of sys/lib/libkern/arch/m68k/strncmp.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: strncmp.S,v 1.3 2003/06/02 23:28:08 millert Exp $     */
        !             2:
        !             3: /*-
        !             4:  * Copyright (c) 1990 The Regents of the University of California.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * This code is derived from software contributed to Berkeley by
        !             8:  * the Systems Programming Group of the University of Utah Computer
        !             9:  * Science Department.
        !            10:  *
        !            11:  * Redistribution and use in source and binary forms, with or without
        !            12:  * modification, are permitted provided that the following conditions
        !            13:  * are met:
        !            14:  * 1. Redistributions of source code must retain the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer.
        !            16:  * 2. Redistributions in binary form must reproduce the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer in the
        !            18:  *    documentation and/or other materials provided with the distribution.
        !            19:  * 3. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  */
        !            35:
        !            36: #if defined(LIBC_SCCS) && !defined(lint)
        !            37:        .text
        !            38:        /*.asciz "from: @(#)strncmp.s   5.1 (Berkeley) 5/12/90"*/
        !            39:        .asciz "$OpenBSD: strncmp.S,v 1.3 2003/06/02 23:28:08 millert Exp $"
        !            40: #endif /* LIBC_SCCS and not lint */
        !            41:
        !            42: #include "DEFS.h"
        !            43:
        !            44: /*
        !            45:  * NOTE: this guy returns result compatible with the VAX assembly version.
        !            46:  * The C version on the portable gen directory returns different results
        !            47:  * (different signs!) when comparing chars with the high bit on.  Who is
        !            48:  * right??
        !            49:  */
        !            50: ENTRY(strncmp)
        !            51:        movl    sp@(12),d1              | count
        !            52:        beq     scdone                  | nothing to do
        !            53:        movl    sp@(4),a0               | a0 = string1
        !            54:        movl    sp@(8),a1               | a1 = string2
        !            55: scloop:
        !            56:        movb    a0@+,d0                 | get *string1
        !            57:        cmpb    a1@+,d0                 | compare a byte
        !            58:        bne     scexit                  | not equal, break out
        !            59:        tstb    d0                      | at end of string1?
        !            60:        beq     scdone                  | yes, all done
        !            61:        subql   #1,d1                   | no, adjust count
        !            62:        bne     scloop                  | more to do, keep going
        !            63: scdone:
        !            64:        moveq   #0,d0                   | strings are equal
        !            65:        rts
        !            66: scexit:
        !            67:        subb    a1@-,d0                 | *string1 - *string2
        !            68:        extbl   d0
        !            69:        rts