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Annotation of 43BSDReno/lib/libc/hp300/string/strncmp.s, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * the Systems Programming Group of the University of Utah Computer
        !             7:  * Science Department.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms are permitted
        !            10:  * provided that: (1) source distributions retain this entire copyright
        !            11:  * notice and comment, and (2) distributions including binaries display
        !            12:  * the following acknowledgement:  ``This product includes software
        !            13:  * developed by the University of California, Berkeley and its contributors''
        !            14:  * in the documentation or other materials provided with the distribution
        !            15:  * and in all advertising materials mentioning features or use of this
        !            16:  * software. Neither the name of the University nor the names of its
        !            17:  * contributors may be used to endorse or promote products derived
        !            18:  * from this software without specific prior written permission.
        !            19:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            20:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            21:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            22:  */
        !            23: 
        !            24: #if defined(LIBC_SCCS) && !defined(lint)
        !            25:        .asciz "@(#)strncmp.s   5.1 (Berkeley) 5/12/90"
        !            26: #endif /* LIBC_SCCS and not lint */
        !            27: 
        !            28: #include "DEFS.h"
        !            29: 
        !            30: /*
        !            31:  * NOTE: this guy returns result compatible with the VAX assembly version.
        !            32:  * The C version on the portable gen directory returns different results
        !            33:  * (different signs!) when comparing chars with the high bit on.  Who is
        !            34:  * right??
        !            35:  */
        !            36: ENTRY(strncmp)
        !            37:        movl    sp@(12),d1      /* count */
        !            38:        jeq     scdone          /* nothing to do */
        !            39:        movl    sp@(4),a0       /* a0 = string1 */
        !            40:        movl    sp@(8),a1       /* a1 = string2 */
        !            41: scloop:
        !            42:        movb    a0@+,d0         /* get *string1 */
        !            43:        cmpb    a1@+,d0         /* compare a byte */
        !            44:        jne     scexit          /* not equal, break out */
        !            45:        tstb    d0              /* at end of string1? */
        !            46:        jeq     scdone          /* yes, all done */
        !            47:        subql   #1,d1           /* no, adjust count */
        !            48:        jne     scloop          /* more to do, keep going */
        !            49: scdone:
        !            50:        moveq   #0,d0           /* strings are equal */
        !            51:        rts
        !            52: scexit:
        !            53:        subb    a1@-,d0         /* *string1 - *string2 */
        !            54:        extbl   d0
        !            55:        rts

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