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/* Conversion UCS-4 to UTF-16.
Copyright (C) 2002, 2006-2007, 2009-2024 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
int
u16_uctomb_aux (uint16_t *s, ucs4_t uc, ptrdiff_t n)
{
if (uc < 0xd800)
{
/* The case n >= 1 is already handled by the caller. */
}
else if (uc < 0x10000)
{
if (uc >= 0xe000)
{
if (n >= 1)
{
s[0] = uc;
return 1;
}
}
else
return -1;
}
else
{
if (uc < 0x110000)
{
if (n >= 2)
{
s[0] = 0xd800 + ((uc - 0x10000) >> 10);
s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff);
return 2;
}
}
else
return -1;
}
return -2;
}
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