86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/* Copyright (C) 1996, 1997, 2003 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <wchar.h>
|
|
|
|
|
|
/* Copy no more than N wide-characters of SRC to DEST, returning the
|
|
address of the last character written into DEST. */
|
|
wchar_t *
|
|
__wcpncpy (dest, src, n)
|
|
wchar_t *dest;
|
|
const wchar_t *src;
|
|
size_t n;
|
|
{
|
|
wint_t c;
|
|
wchar_t *const s = dest;
|
|
|
|
if (n >= 4)
|
|
{
|
|
size_t n4 = n >> 2;
|
|
|
|
for (;;)
|
|
{
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == L'\0')
|
|
break;
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == L'\0')
|
|
break;
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == L'\0')
|
|
break;
|
|
c = *src++;
|
|
*dest++ = c;
|
|
if (c == L'\0')
|
|
break;
|
|
if (--n4 == 0)
|
|
goto last_chars;
|
|
}
|
|
n -= dest - s;
|
|
goto zero_fill;
|
|
}
|
|
|
|
last_chars:
|
|
n &= 3;
|
|
if (n == 0)
|
|
return dest;
|
|
|
|
for (;;)
|
|
{
|
|
c = *src++;
|
|
--n;
|
|
*dest++ = c;
|
|
if (c == L'\0')
|
|
break;
|
|
if (n == 0)
|
|
return dest;
|
|
}
|
|
|
|
zero_fill:
|
|
while (n-- > 0)
|
|
dest[n] = L'\0';
|
|
|
|
return dest - 1;
|
|
}
|
|
|
|
weak_alias (__wcpncpy, wcpncpy)
|