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/* Conversion UTF-16 to UCS-4.
Copyright (C) 2001-2002 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This program is free software; you can redistribute it and/or modify
it under 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.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <stddef.h>
/* Return the length (number of units) of the first character in S, putting
its 'ucs4_t' representation in *PUC. */
static int
u16_mbtouc_aux (unsigned int *puc, const unsigned short *s, size_t n)
{
unsigned short c = *s;
if (c < 0xdc00)
{
if (n >= 2)
{
if (s[1] >= 0xdc00 && s[1] < 0xe000)
{
*puc = 0x10000 + ((c - 0xd800) << 10) + (s[1] - 0xdc00);
return 2;
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return n;
}
}
/* invalid multibyte character */
*puc = 0xfffd;
return 1;
}
static inline int
u16_mbtouc (unsigned int *puc, const unsigned short *s, size_t n)
{
unsigned short c = *s;
if (c < 0xd800 || c >= 0xe000)
{
*puc = c;
return 1;
}
else
return u16_mbtouc_aux (puc, s, n);
}
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