mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-19 12:59:21 +08:00
8e71066cb2
A lot of the 3rd party code in the string library is around 20 years old and has been worked on since. I've updated the OpenBSD functions at least.
87 lines
3.0 KiB
C
87 lines
3.0 KiB
C
/*
|
|
FUNCTION
|
|
<<wcslcat>>---concatenate wide-character strings to specified length
|
|
|
|
SYNOPSIS
|
|
#include <wchar.h>
|
|
size_t wcslcat(wchar_t *<[dst]>, const wchar_t *<[src]>, size_t <[siz]>);
|
|
|
|
DESCRIPTION
|
|
The <<wcslcat>> function appends wide characters from <[src]> to
|
|
end of the <[dst]> wide-character string so that the resultant
|
|
wide-character string is not more than <[siz]> wide characters
|
|
including the terminating null wide-character code. A terminating
|
|
null wide character is always added unless <[siz]> is 0. Thus,
|
|
the maximum number of wide characters that can be appended from
|
|
<[src]> is <[siz]> - 1. If copying takes place between objects
|
|
that overlap, the behaviour is undefined.
|
|
|
|
RETURNS
|
|
Wide-character string length of initial <[dst]> plus the
|
|
wide-character string length of <[src]> (does not include
|
|
terminating null wide-characters). If the return value is
|
|
greater than or equal to <[siz]>, then truncation occurred and
|
|
not all wide characters from <[src]> were appended.
|
|
|
|
PORTABILITY
|
|
No supporting OS subroutines are required.
|
|
*/
|
|
|
|
/* $OpenBSD: wcslcat.c,v 1.7 2019/01/25 00:19:25 millert Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <wchar.h>
|
|
|
|
/*
|
|
* Appends src to string dst of size dsize (unlike strncat, dsize is the
|
|
* full size of dst, not space left). At most dsize-1 characters
|
|
* will be copied. Always NUL terminates (unless dsize <= wcslen(dst)).
|
|
* Returns wcslen(src) + MIN(dsize, wcslen(initial dst)).
|
|
* If retval >= siz, truncation occurred.
|
|
*/
|
|
size_t
|
|
wcslcat (wchar_t *dst,
|
|
const wchar_t *src,
|
|
size_t dsize)
|
|
{
|
|
const wchar_t *odst = dst;
|
|
const wchar_t *osrc = src;
|
|
size_t n = dsize;
|
|
size_t dlen;
|
|
|
|
/* Find the end of dst and adjust bytes left but don't go past end. */
|
|
while (n-- != 0 && *dst != L'\0')
|
|
dst++;
|
|
dlen = dst - odst;
|
|
n = dsize - dlen;
|
|
|
|
if (n-- == 0)
|
|
return(dlen + wcslen(src));
|
|
while (*src != L'\0') {
|
|
if (n != 0) {
|
|
*dst++ = *src;
|
|
n--;
|
|
}
|
|
src++;
|
|
}
|
|
*dst = L'\0';
|
|
|
|
return(dlen + (src - osrc)); /* count does not include NUL */
|
|
}
|