1 /* $NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun 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 * $FreeBSD$ 31 */ 32 33 #include <sys/cdefs.h> 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 38 #include <sys/types.h> 39 #include <assert.h> 40 #include <wchar.h> 41 42 /* 43 * Appends src to string dst of size siz (unlike wcsncat, siz is the 44 * full size of dst, not space left). At most siz-1 characters 45 * will be copied. Always NUL terminates (unless siz == 0). 46 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz, 47 * truncation occurred. 48 */ 49 size_t 50 wcslcat(dst, src, siz) 51 wchar_t *dst; 52 const wchar_t *src; 53 size_t siz; 54 { 55 wchar_t *d = dst; 56 const wchar_t *s = src; 57 size_t n = siz; 58 size_t dlen; 59 60 _DIAGASSERT(dst != NULL); 61 _DIAGASSERT(src != NULL); 62 63 /* Find the end of dst and adjust bytes left but don't go past end */ 64 while (*d != '\0' && n-- != 0) 65 d++; 66 dlen = d - dst; 67 n = siz - dlen; 68 69 if (n == 0) 70 return(dlen + wcslen(s)); 71 while (*s != '\0') { 72 if (n != 1) { 73 *d++ = *s; 74 n--; 75 } 76 s++; 77 } 78 *d = '\0'; 79 80 return(dlen + (s - src)); /* count does not include NUL */ 81 } 82