121436Sdist/* 2*61222Sbostic * Copyright (c) 1983, 1993 3*61222Sbostic * The Regents of the University of California. All rights reserved. 434481Sbostic * 542639Sbostic * %sccs.include.redist.c% 621436Sdist */ 717323Ssam 834819Sbostic#if defined(LIBC_SCCS) && !defined(lint) 9*61222Sbostic .asciz "@(#)strncat.s 8.1 (Berkeley) 06/04/93" 1034819Sbostic#endif /* LIBC_SCCS and not lint */ 1121436Sdist 1217323Ssam/* 1317323Ssam * Concatenate string s2 on the end of s1 1417323Ssam * and return the base of s1. The parameter 1517323Ssam * n is the maximum length of string s2 to 1617323Ssam * concatenate. 1717323Ssam * 1817323Ssam * char * 1917323Ssam * strncat(s1, s2, n) 2017323Ssam * char *s1, *s2; 2117323Ssam * int n; 2217323Ssam */ 2317329Ssam#include "DEFS.h" 2417323Ssam 2517329SsamENTRY(strncat, R6) 2617323Ssam movl 12(ap),r6 # r6 = n 2717323Ssam bleq done # n <= 0 2817323Ssam movl 4(ap),r3 # r3 = s1 2917323Ssam movl r3,r1 3017323Ssam0: 3117323Ssam locc $0,$65535,(r1) 3217323Ssam beql 0b 3317323Ssam movl r1,r3 # r3 = index(s1, '\0'); 3417323Ssam movl 8(ap),r1 # r1 = s2 3517323Ssam1: 3617323Ssam movzwl $65535,r2 # r2 = bytes in first chunk 3717323Ssam cmpl r6,r2 # r2 = min(bytes in chunk, n); 3817323Ssam jgeq 2f 3917323Ssam movl r6,r2 4017323Ssam2: 4117323Ssam subl2 r2,r6 # update n 4217323Ssam locc $0,r2,(r1) # '\0' found? 4317323Ssam jneq 3f 4417323Ssam subl2 r2,r1 # back up pointer updated by locc 4517323Ssam movc3 r2,(r1),(r3) # copy in next piece 4617323Ssam tstl r6 # run out of space? 4717323Ssam jneq 1b 4817323Ssam clrb (r3) # force '\0' termination 4917323Ssam jbr done 5017323Ssam3: 5117323Ssam subl2 r0,r2 # r2 = number of bytes to move 5217323Ssam subl2 r2,r1 # back up pointer updated by locc 5317323Ssam incl r2 # copy '\0' as well 5417323Ssam movc3 r2,(r1),(r3) # copy in last piece 5517323Ssamdone: 5617323Ssam movl 4(ap),r0 # return s1 5717323Ssam ret 58