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/* Copyright (C) 2011-2024 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);
}
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