1/* 2 * Copyright (c) 1988 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 the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * This code is derived from software contributed to Berkeley by 18 * Computer Consoles Inc. 19 */ 20 21#if defined(LIBC_SCCS) && !defined(lint) 22 .asciz "@(#)strncat.s 1.4 (Berkeley) 06/27/88" 23#endif /* LIBC_SCCS and not lint */ 24 25/* 26 * Concatenate s2 on the end of s1. S1's space must be large enough. 27 * At most n characters are moved. 28 * Return s1. 29 * 30 * char *strncat(s1, s2, n) 31 * register char *s1, *s2; 32 * register n; 33 */ 34#include "DEFS.h" 35 36ENTRY(strncat, 0) 37 tstl 12(fp) 38 jgtr n_ok 39 movl 4(fp),r0 40 ret 41n_ok: 42 movl 8(fp),r0 43 movl r0,r1 44 cmps2 # r0 points at null at end of s2 45 subl3 8(fp),r0,r2 # r2 = numberof non-null chars in s2 46 cmpl 12(fp),r2 47 jgeq r2_ok 48 movl 12(fp),r2 # r2 = min (n, length(s2)) 49r2_ok: 50 movl 4(fp),r0 51 movl r0,r1 52 cmps2 # r1 points at null at end of s1 53 movl 8(fp),r0 # source for copy 54 movs3 # actual copy 55 clrb (r1) # null terminated string ! 56 movl 4(fp),r0 57 ret 58