strncat.c revision 103012
1155310Srwatson/*- 2155310Srwatson * Copyright (c) 1990, 1993 3155310Srwatson * The Regents of the University of California. All rights reserved. 4156288Srwatson * 5155310Srwatson * This code is derived from software contributed to Berkeley by 6156288Srwatson * Chris Torek. 7156288Srwatson * 8156288Srwatson * Redistribution and use in source and binary forms, with or without 9156288Srwatson * modification, are permitted provided that the following conditions 10156288Srwatson * are met: 11156288Srwatson * 1. Redistributions of source code must retain the above copyright 12156288Srwatson * notice, this list of conditions and the following disclaimer. 13156288Srwatson * 2. Redistributions in binary form must reproduce the above copyright 14156288Srwatson * notice, this list of conditions and the following disclaimer in the 15156310Srwatson * documentation and/or other materials provided with the distribution. 16156288Srwatson * 3. All advertising materials mentioning features or use of this software 17156288Srwatson * must display the following acknowledgement: 18156288Srwatson * This product includes software developed by the University of 19156288Srwatson * California, Berkeley and its contributors. 20156288Srwatson * 4. Neither the name of the University nor the names of its contributors 21156288Srwatson * may be used to endorse or promote products derived from this software 22156288Srwatson * without specific prior written permission. 23156288Srwatson * 24156288Srwatson * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25156288Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26156288Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27156288Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28156288Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29156288Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30156288Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31156288Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32155310Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33159984Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34159984Srwatson * SUCH DAMAGE. 35155310Srwatson */ 36159984Srwatson 37159984Srwatson#if defined(LIBC_SCCS) && !defined(lint) 38155310Srwatsonstatic char sccsid[] = "@(#)strncat.c 8.1 (Berkeley) 6/4/93"; 39156288Srwatson#endif /* LIBC_SCCS and not lint */ 40156288Srwatson#include <sys/cdefs.h> 41156288Srwatson__FBSDID("$FreeBSD: head/lib/libc/string/strncat.c 103012 2002-09-06 11:24:06Z tjr $"); 42156288Srwatson 43155310Srwatson#include <string.h> 44155310Srwatson 45/* 46 * Concatenate src on the end of dst. At most strlen(dst)+n+1 bytes 47 * are written at dst (at most n+1 bytes being appended). Return dst. 48 */ 49char * 50strncat(char * __restrict dst, const char * __restrict src, size_t n) 51{ 52 if (n != 0) { 53 char *d = dst; 54 const char *s = src; 55 56 while (*d != 0) 57 d++; 58 do { 59 if ((*d = *s++) == 0) 60 break; 61 d++; 62 } while (--n != 0); 63 *d = 0; 64 } 65 return (dst); 66} 67