67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <uchar.h>
|
|
#include <wchar.h>
|
|
|
|
|
|
/* This is the private state used if PS is NULL. */
|
|
static mbstate_t state;
|
|
|
|
size_t
|
|
c16rtomb (char *s, char16_t c16, mbstate_t *ps)
|
|
{
|
|
wchar_t wc = c16;
|
|
|
|
if (ps == NULL)
|
|
ps = &state;
|
|
|
|
if (s == NULL)
|
|
{
|
|
/* Reset any state relating to surrogate pairs. */
|
|
ps->__count &= 0x7fffffff;
|
|
ps->__value.__wch = 0;
|
|
wc = 0;
|
|
}
|
|
|
|
if (ps->__count & 0x80000000)
|
|
{
|
|
/* The previous call passed in the first surrogate of a
|
|
surrogate pair. */
|
|
ps->__count &= 0x7fffffff;
|
|
if (wc >= 0xdc00 && wc < 0xe000)
|
|
wc = (0x10000
|
|
+ ((ps->__value.__wch & 0x3ff) << 10)
|
|
+ (wc & 0x3ff));
|
|
else
|
|
/* This is not a low surrogate; ensure an EILSEQ error by
|
|
trying to decode the high surrogate as a wide character on
|
|
its own. */
|
|
wc = ps->__value.__wch;
|
|
ps->__value.__wch = 0;
|
|
}
|
|
else if (wc >= 0xd800 && wc < 0xdc00)
|
|
{
|
|
/* The high part of a surrogate pair. */
|
|
ps->__count |= 0x80000000;
|
|
ps->__value.__wch = wc;
|
|
return 0;
|
|
}
|
|
|
|
return wcrtomb (s, wc, ps);
|
|
}
|