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Annotation of 43BSD/lib/libc/vax/gen/strcat.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifdef LIBC_SCCS
        !             8:        .asciz  "@(#)strcat.s   5.3 (Berkeley) 3/9/86"
        !             9: #endif LIBC_SCCS
        !            10: 
        !            11: /*
        !            12:  * Concatenate string s2 to the end of s1
        !            13:  * and return the base of s1.
        !            14:  *
        !            15:  * char *
        !            16:  * strcat(s1, s2)
        !            17:  *     char *s1, *s2;
        !            18:  */
        !            19: #include "DEFS.h"
        !            20: 
        !            21: ENTRY(strcat, R6|R7)
        !            22:        movq    4(ap), r6       # r6 = s1; r7 = s2
        !            23:        movl    r6,r1
        !            24: 0:
        !            25:        locc    $0,$65535,(r1)  # look for '\0'
        !            26:        beql    0b
        !            27:        movl    r1,r3           # save end of s1
        !            28: 1:
        !            29:        locc    $0,$65535,(r7)  # find length of s2
        !            30:        bneq    2f
        !            31:        movc3   $65535,(r7),(r3)# copy full block
        !            32:        movl    r1,r7
        !            33:        jbr     1b
        !            34: 2:
        !            35:        subl2   r7,r1           # calculate length
        !            36:        incl    r1
        !            37:        movc3   r1,(r7),(r3)    # copy remainder
        !            38:        movl    r6,r0
        !            39:        ret

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