sysdeps/vax/strcat.s

   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, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31         .asciz "@(#)strcat.s    5.6 (Berkeley) 6/1/90"
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 /*
  35  * Concatenate string s2 to the end of s1
  36  * and return the base of s1.
  37  *
  38  * char *
  39  * strcat(s1, s2)
  40  *      char *s1, *s2;
  41  */
  42 #include "DEFS.h"
  43
  44 ENTRY(strcat, R6|R7)
  45         movq    4(ap), r6       # r6 = s1; r7 = s2
  46         movl    r6,r1
  47 0:
  48         locc    $0,$65535,(r1)  # look for '\0'
  49         beql    0b
  50         movl    r1,r3           # save end of s1
  51 1:
  52         locc    $0,$65535,(r7)  # find length of s2
  53         bneq    2f
  54         movc3   $65535,(r7),(r3)# copy full block
  55         movl    r1,r7
  56         jbr     1b
  57 2:
  58         subl2   r7,r1           # calculate length
  59         incl    r1
  60         movc3   r1,(r7),(r3)    # copy remainder
  61         movl    r6,r0
  62         ret