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/* Multibyte to UTF-8 conversion.
Copyright (C) 2022-2024 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 <assert.h>
#include <dlfcn.h>
#include <errno.h>
#include <gconv.h>
#include <uchar.h>
#include <wcsmbsload.h>
#ifndef EILSEQ
# define EILSEQ EINVAL
#endif
/* This is the private state used if PS is NULL. */
static mbstate_t state;
size_t
mbrtoc8 (char8_t *pc8, const char *s, size_t n, mbstate_t *ps)
{
/* This implementation depends on the converter invoked by mbrtowc not
needing to retain state in either the top most bit of ps->__count or
in ps->__value between invocations. This implementation uses the
top most bit of ps->__count to indicate that trailing code units are
yet to be written and uses ps->__value to store those code units. */
if (ps == NULL)
ps = &state;
/* If state indicates that trailing code units are yet to be written, write
those first regardless of whether 's' is a null pointer. */
if (ps->__count & 0x80000000)
{
/* ps->__value.__wchb[3] stores the index of the next code unit to
write. Code units are stored in reverse order. */
size_t i = ps->__value.__wchb[3];
if (pc8 != NULL)
{
*pc8 = ps->__value.__wchb[i];
}
if (i == 0)
{
ps->__count &= 0x7fffffff;
ps->__value.__wch = 0;
}
else
--ps->__value.__wchb[3];
return -3;
}
if (s == NULL)
{
/* if 's' is a null pointer, behave as if a null pointer was passed for
'pc8', an empty string was passed for 's', and 1 passed for 'n'. */
pc8 = NULL;
s = "";
n = 1;
}
wchar_t wc;
size_t result;
result = mbrtowc (&wc, s, n, ps);
if (result <= n)
{
if (wc <= 0x7F)
{
if (pc8 != NULL)
*pc8 = wc;
}
else if (wc <= 0x7FF)
{
if (pc8 != NULL)
*pc8 = 0xC0 + ((wc >> 6) & 0x1F);
ps->__value.__wchb[0] = 0x80 + (wc & 0x3F);
ps->__value.__wchb[3] = 0;
ps->__count |= 0x80000000;
}
else if (wc <= 0xFFFF)
{
if (pc8 != NULL)
*pc8 = 0xE0 + ((wc >> 12) & 0x0F);
ps->__value.__wchb[1] = 0x80 + ((wc >> 6) & 0x3F);
ps->__value.__wchb[0] = 0x80 + (wc & 0x3F);
ps->__value.__wchb[3] = 1;
ps->__count |= 0x80000000;
}
else if (wc <= 0x10FFFF)
{
if (pc8 != NULL)
*pc8 = 0xF0 + ((wc >> 18) & 0x07);
ps->__value.__wchb[2] = 0x80 + ((wc >> 12) & 0x3F);
ps->__value.__wchb[1] = 0x80 + ((wc >> 6) & 0x3F);
ps->__value.__wchb[0] = 0x80 + (wc & 0x3F);
ps->__value.__wchb[3] = 2;
ps->__count |= 0x80000000;
}
}
if (result == 0 && wc != 0)
{
/* mbrtowc() never returns -3. When a MB sequence converts to multiple
WCs, no input is consumed when writing the subsequent WCs resulting
in a result of 0 even if a null character wasn't written. */
result = -3;
}
return result;
}
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