/* strncat.s 4.2 84/11/01 */
* Concatenate string s2 on the end of s1
* and return the base of s1. The parameter
* n is the maximum length of string s2 to
movl r1,r3 # r3 = index(s1, '\0');
movzwl $65535,r2 # r2 = bytes in first chunk
cmpl r6,r2 # r2 = min(bytes in chunk, n);
locc $0,r2,(r1) # '\0' found?
subl2 r2,r1 # back up pointer updated by locc
movc3 r2,(r1),(r3) # copy in next piece
tstl r6 # run out of space?
clrb (r3) # force '\0' termination
subl2 r0,r2 # r2 = number of bytes to move
subl2 r2,r1 # back up pointer updated by locc
incl r2 # copy '\0' as well
movc3 r2,(r1),(r3) # copy in last piece
movl 4(ap),r0 # return s1