1 /* $OpenBSD: wcslcat.c,v 1.3 2005/08/08 08:05:37 espie Exp $ */ 2 /* $NetBSD: wcslcat.c,v 1.2 2001/01/03 14:33:02 lukem Exp $ */ 3 /* from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp */ 4 5 /* 6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <wchar.h> 34 35 /* 36 * Appends src to string dst of size siz (unlike wcsncat, siz is the 37 * full size of dst, not space left). At most siz-1 characters 38 * will be copied. Always NUL terminates (unless siz == 0). 39 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz, 40 * truncation occurred. 41 */ 42 size_t 43 wcslcat(wchar_t *dst, const wchar_t *src, size_t siz) 44 { 45 wchar_t *d = dst; 46 const wchar_t *s = src; 47 size_t n = siz; 48 size_t dlen; 49 50 /* Find the end of dst and adjust bytes left but don't go past end */ 51 while (*d != '\0' && n-- != 0) 52 d++; 53 dlen = d - dst; 54 n = siz - dlen; 55 56 if (n == 0) 57 return(dlen + wcslen(s)); 58 while (*s != '\0') { 59 if (n != 1) { 60 *d++ = *s; 61 n--; 62 } 63 s++; 64 } 65 *d = '\0'; 66 67 return(dlen + (s - src)); /* count does not include NUL */ 68 } 69