strncat.c revision 1.2.8.2
1 1.2.8.2 tls /* $NetBSD: strncat.c,v 1.2.8.2 2014/08/19 23:45:14 tls Exp $ */ 2 1.2.8.2 tls 3 1.2.8.2 tls /*- 4 1.2.8.2 tls * Copyright (c) 1990, 1993 5 1.2.8.2 tls * The Regents of the University of California. All rights reserved. 6 1.2.8.2 tls * 7 1.2.8.2 tls * This code is derived from software contributed to Berkeley by 8 1.2.8.2 tls * Chris Torek. 9 1.2.8.2 tls * 10 1.2.8.2 tls * Redistribution and use in source and binary forms, with or without 11 1.2.8.2 tls * modification, are permitted provided that the following conditions 12 1.2.8.2 tls * are met: 13 1.2.8.2 tls * 1. Redistributions of source code must retain the above copyright 14 1.2.8.2 tls * notice, this list of conditions and the following disclaimer. 15 1.2.8.2 tls * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.8.2 tls * notice, this list of conditions and the following disclaimer in the 17 1.2.8.2 tls * documentation and/or other materials provided with the distribution. 18 1.2.8.2 tls * 3. Neither the name of the University nor the names of its contributors 19 1.2.8.2 tls * may be used to endorse or promote products derived from this software 20 1.2.8.2 tls * without specific prior written permission. 21 1.2.8.2 tls * 22 1.2.8.2 tls * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 1.2.8.2 tls * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.2.8.2 tls * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.2.8.2 tls * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 1.2.8.2 tls * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.2.8.2 tls * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.2.8.2 tls * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.2.8.2 tls * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.2.8.2 tls * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.2.8.2 tls * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.2.8.2 tls * SUCH DAMAGE. 33 1.2.8.2 tls */ 34 1.2.8.2 tls 35 1.2.8.2 tls #include <sys/cdefs.h> 36 1.2.8.2 tls #if defined(LIBC_SCCS) && !defined(lint) 37 1.2.8.2 tls #if 0 38 1.2.8.2 tls static char sccsid[] = "@(#)strncat.c 8.1 (Berkeley) 6/4/93"; 39 1.2.8.2 tls #else 40 1.2.8.2 tls __RCSID("$NetBSD: strncat.c,v 1.2.8.2 2014/08/19 23:45:14 tls Exp $"); 41 1.2.8.2 tls #endif 42 1.2.8.2 tls #endif /* LIBC_SCCS and not lint */ 43 1.2.8.2 tls 44 1.2.8.2 tls #if !defined(_KERNEL) && !defined(_STANDALONE) 45 1.2.8.2 tls #include <assert.h> 46 1.2.8.2 tls #include <string.h> 47 1.2.8.2 tls #else 48 1.2.8.2 tls #include <lib/libkern/libkern.h> 49 1.2.8.2 tls #endif 50 1.2.8.2 tls 51 1.2.8.2 tls #ifdef _FORTIFY_SOURCE 52 1.2.8.2 tls #undef strncat 53 1.2.8.2 tls #endif 54 1.2.8.2 tls 55 1.2.8.2 tls /* 56 1.2.8.2 tls * Concatenate src on the end of dst. At most strlen(dst)+n+1 bytes 57 1.2.8.2 tls * are written at dst (at most n+1 bytes being appended). Return dst. 58 1.2.8.2 tls */ 59 1.2.8.2 tls char * 60 1.2.8.2 tls strncat(char *dst, const char *src, size_t n) 61 1.2.8.2 tls { 62 1.2.8.2 tls 63 1.2.8.2 tls _DIAGASSERT(dst != NULL); 64 1.2.8.2 tls _DIAGASSERT(src != NULL); 65 1.2.8.2 tls 66 1.2.8.2 tls if (n != 0) { 67 1.2.8.2 tls char *d = dst; 68 1.2.8.2 tls const char *s = src; 69 1.2.8.2 tls 70 1.2.8.2 tls while (*d != 0) 71 1.2.8.2 tls d++; 72 1.2.8.2 tls do { 73 1.2.8.2 tls if ((*d = *s++) == 0) 74 1.2.8.2 tls break; 75 1.2.8.2 tls d++; 76 1.2.8.2 tls } while (--n != 0); 77 1.2.8.2 tls *d = 0; 78 1.2.8.2 tls } 79 1.2.8.2 tls return (dst); 80 1.2.8.2 tls } 81
Indexes created Thu Sep 25 02:09:54 GMT 2025