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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19:        .asciz "@(#)strcat.s    5.5 (Berkeley) 6/27/88"
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: /*
        !            23:  * Concatenate string s2 to the end of s1
        !            24:  * and return the base of s1.
        !            25:  *
        !            26:  * char *
        !            27:  * strcat(s1, s2)
        !            28:  *     char *s1, *s2;
        !            29:  */
        !            30: #include "DEFS.h"
        !            31: 
        !            32: ENTRY(strcat, R6|R7)
        !            33:        movq    4(ap), r6       # r6 = s1; r7 = s2
        !            34:        movl    r6,r1
        !            35: 0:
        !            36:        locc    $0,$65535,(r1)  # look for '\0'
        !            37:        beql    0b
        !            38:        movl    r1,r3           # save end of s1
        !            39: 1:
        !            40:        locc    $0,$65535,(r7)  # find length of s2
        !            41:        bneq    2f
        !            42:        movc3   $65535,(r7),(r3)# copy full block
        !            43:        movl    r1,r7
        !            44:        jbr     1b
        !            45: 2:
        !            46:        subl2   r7,r1           # calculate length
        !            47:        incl    r1
        !            48:        movc3   r1,(r7),(r3)    # copy remainder
        !            49:        movl    r6,r0
        !            50:        ret

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