2.11BSD#431 - /usr/src/lib/libc/pdp/gen/strcat.s

   1: /*
   2:  * Copyright (c) 1987 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:         <@(#)strcat.s	1.1 (Berkeley) 1/20/87\0>
   9:         .even
  10: #endif LIBC_SCCS
  11: 
  12: /*
  13:  * Concatenate string s2 to the end of s1
  14:  * and return the base of s1.
  15:  *
  16:  * char *
  17:  * strcat(s1, s2)
  18:  *	char *s1, *s2;
  19:  */
  20: #include "DEFS.h"
  21: 
  22: ENTRY(strcat)
  23:         mov     2(sp),r0        / r0 = s1
  24: 1:
  25:         tstb    (r0)+           / find end of string
  26:         bne     1b
  27:         dec     r0              / back up to '\0'
  28:         mov     4(sp),r1        / r1 = s2
  29: 2:
  30:         movb    (r1)+,(r0)+     / copy s2 to end of s1
  31:         bne     2b
  32:         mov     2(sp),r0        / and return s1
  33:         rts     pc

Defined functions