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 */ 47 size_t 48 wcslcat(dst, src, siz) 49 wchar_t *dst; 50 const wchar_t *src; 51 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 _DIAGASSERT(dst != NULL); 59 _DIAGASSERT(src != NULL); 60 61 /* Find the end of dst and adjust bytes left but don't go past end */ 62 while (*d != '\0' && n-- != 0) 63 d++; 64 dlen = d - dst; 65 n = siz - dlen; 66 67 if (n == 0) 68 return(dlen + wcslen(s)); 69 while (*s != '\0') { 70 if (n != 1) { 71 *d++ = *s; 72 n--; 73 } 74 s++; 75 } 76 *d = '\0'; 77 78 return(dlen + (s - src)); /* count does not include NUL */ 79 } 80