1/* $NetBSD: wcslcat.c,v 1.2 2001/01/03 14:33:02 lukem Exp $ */ 2/* from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp */ 3 4/* 5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32#if defined(LIBC_SCCS) && !defined(lint) 33__RCSID("$NetBSD: wcslcat.c,v 1.2 2001/01/03 14:33:02 lukem Exp $"); 34#endif /* LIBC_SCCS and not lint */ 35 36#include <sys/types.h> 37#include <assert.h> 38#include <wchar.h> 39 40/* 41 * Appends src to string dst of size siz (unlike wcsncat, siz is the 42 * full size of dst, not space left). At most siz-1 characters 43 * will be copied. Always NUL terminates (unless siz == 0). 44 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz, 45 * truncation occurred. 46 */ 47size_t 48wcslcat(wchar_t *dst, const wchar_t *src, size_t siz) 49{ 50 wchar_t *d = dst; 51 const wchar_t *s = src; 52 size_t n = siz; 53 size_t dlen; 54 55 _DIAGASSERT(dst != NULL); 56 _DIAGASSERT(src != NULL); 57 58 /* Find the end of dst and adjust bytes left but don't go past end */ 59 while (*d != '\0' && n-- != 0) 60 d++; 61 dlen = d - dst; 62 n = siz - dlen; 63 64 if (n == 0) 65 return(dlen + wcslen(s)); 66 while (*s != '\0') { 67 if (n != 1) { 68 *d++ = *s; 69 n--; 70 } 71 s++; 72 } 73 *d = '\0'; 74 75 return(dlen + (s - src)); /* count does not include NUL */ 76} 77