104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/****************************************************************************
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* libs/libc/wchar/lib_wcslcat.c
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <wchar.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: wcslcat
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*
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* Description:
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* Appends src to string dst of size siz (unlike wcsncat, siz is the
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* full size of dst, not space left). At most siz-1 characters
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* will be copied. Always NUL terminates (unless siz == 0).
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* Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
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* truncation occurred.
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*
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* Input Parameters:
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* dst - the dest wchar string that contains the concatenated string
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* src - the source wchar string that we need to concatenate
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* siz - the max length that can be written to the end of the dst string
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*
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* Returned Value:
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* The total length of the wchar string that concatenated
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*
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****************************************************************************/
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size_t wcslcat(FAR wchar_t *dst, FAR const wchar_t *src, size_t siz)
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{
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FAR wchar_t *d = dst;
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FAR const wchar_t *s = src;
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size_t n = siz;
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size_t dlen;
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/* Find the end of dst and adjust bytes left but don't go past end */
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while (n-- != 0 && *d != '\0')
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{
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d++;
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}
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dlen = d - dst;
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n = siz - dlen;
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if (n == 0)
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{
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return(dlen + wcslen(s));
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}
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while (*s != '\0')
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{
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if (n != 1)
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{
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*d++ = *s;
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n--;
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}
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s++;
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}
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*d = '\0';
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/* count does not include NUL */
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return(dlen + (s - src));
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}
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