1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp 30 */ 31 32 #include <sys/cdefs.h> 33 #if 0 34 #if defined(LIBC_SCCS) && !defined(lint) 35 __RCSID("$NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $"); 36 #endif /* LIBC_SCCS and not lint */ 37 #endif 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/types.h> 41 #include <wchar.h> 42 43 /* 44 * Appends src to string dst of size siz (unlike wcsncat, siz is the 45 * full size of dst, not space left). At most siz-1 characters 46 * will be copied. Always NUL terminates (unless siz == 0). 47 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz, 48 * truncation occurred. 49 */ 50 size_t 51 wcslcat(wchar_t *dst, const wchar_t *src, size_t siz) 52 { 53 wchar_t *d = dst; 54 const wchar_t *s = src; 55 size_t n = siz; 56 size_t dlen; 57 58 /* Find the end of dst and adjust bytes left but don't go past end */ 59 while (n-- != 0 && *d != '\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