109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/*
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FUNCTION
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<<wcslcat>>---concatenate wide-character strings to specified length
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ANSI_SYNOPSIS
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#include <wchar.h>
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size_t wcslcat(wchar_t *<[dst]>, const wchar_t *<[src]>, size_t <[siz]>);
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TRAD_SYNOPSIS
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#include <wchar.h>
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size_t wcslcat(<[dst]>, <[src]>, <[siz]>
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wchar_t *<[dst]>;
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const wchar_t *<[src]>;
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size_t <[siz]>;
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DESCRIPTION
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The <<wcslcat>> function appends wide characters from <[src]> to
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end of the <[dst]> wide-character string so that the resultant
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wide-character string is not more than <[siz]> wide characters
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including the terminating null wide-character code. A terminating
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null wide character is always added unless <[siz]> is 0. Thus,
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the maximum number of wide characters that can be appended from
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<[src]> is <[siz]> - 1. If copying takes place between objects
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that overlap, the behaviour is undefined.
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RETURNS
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Wide-character string length of initial <[dst]> plus the
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wide-character string length of <[src]> (does not include
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terminating null wide-characters). If the return value is
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greater than or equal to <[siz]>, then truncation occurred and
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not all wide characters from <[src]> were appended.
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PORTABILITY
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No supporting OS subroutines are required.
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*/
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/* $NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $ */
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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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* 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 PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <_ansi.h>
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#include <wchar.h>
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/*
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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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size_t
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_DEFUN (wcslcat, (dst, src, siz),
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wchar_t * dst _AND
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_CONST wchar_t * src _AND
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size_t siz)
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{
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wchar_t *d = dst;
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_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 (*d != '\0' && n-- != 0)
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d++;
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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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return (dlen + wcslen (s));
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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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return (dlen + (s - src)); /* count does not include NUL */
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}
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