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Annotation of 43BSDReno/lib/libc/vax/string/strcat.s, revision 1.1.1.1

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: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21:        .asciz "@(#)strcat.s    5.6 (Berkeley) 6/1/90"
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: /*
                     25:  * Concatenate string s2 to the end of s1
                     26:  * and return the base of s1.
                     27:  *
                     28:  * char *
                     29:  * strcat(s1, s2)
                     30:  *     char *s1, *s2;
                     31:  */
                     32: #include "DEFS.h"
                     33: 
                     34: ENTRY(strcat, R6|R7)
                     35:        movq    4(ap), r6       # r6 = s1; r7 = s2
                     36:        movl    r6,r1
                     37: 0:
                     38:        locc    $0,$65535,(r1)  # look for '\0'
                     39:        beql    0b
                     40:        movl    r1,r3           # save end of s1
                     41: 1:
                     42:        locc    $0,$65535,(r7)  # find length of s2
                     43:        bneq    2f
                     44:        movc3   $65535,(r7),(r3)# copy full block
                     45:        movl    r1,r7
                     46:        jbr     1b
                     47: 2:
                     48:        subl2   r7,r1           # calculate length
                     49:        incl    r1
                     50:        movc3   r1,(r7),(r3)    # copy remainder
                     51:        movl    r6,r0
                     52:        ret

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