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/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.org>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <wchar.h>
#ifndef EILSEQ
#define EILSEQ EINVAL
#endif
static const wchar_t encoding_mask[] =
{
~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff
};
static const unsigned char encoding_byte[] =
{
0xc0, 0xe0, 0xf0, 0xf8, 0xfc
};
/* We don't need the state really because we don't have shift states
to maintain between calls to this function. */
static mbstate_t internal;
/* This is a non-standard function but it is very useful in the
implementation of stdio because we have to deal with unterminated
buffers. At most NWC wide character will be converted. */
size_t
__wmemrtombs (dst, src, nwc, len, ps)
char *dst;
const wchar_t **src;
size_t nwc;
size_t len;
mbstate_t *ps;
{
size_t written = 0;
const wchar_t *run = *src;
if (ps == NULL)
ps = &internal;
if (dst == NULL)
/* The LEN parameter has to be ignored if we don't actually write
anything. */
len = ~0;
while (written < len && nwc-- > 0)
{
wchar_t wc;
/* Store position of first unprocessed word. */
*src = run;
wc = *run++;
if (wc < 0 || wc > 0x7fffffff)
{
/* This is no correct ISO 10646 character. */
__set_errno (EILSEQ);
return (size_t) -1;
}
if (wc < 0x80)
{
/* It's an one byte sequence. */
if (dst != NULL)
*dst++ = (char) wc;
++written;
}
else
{
size_t step;
for (step = 2; step < 6; ++step)
if ((wc & encoding_mask[step - 2]) == 0)
break;
if (written + step >= len)
/* Too long. */
break;
if (dst != NULL)
{
size_t cnt = step;
dst[0] = encoding_byte[cnt - 2];
--cnt;
do
{
dst[cnt] = 0x80 | (wc & 0x3f);
wc >>= 6;
}
while (--cnt > 0);
dst[0] |= wc;
dst += step;
}
written += step;
}
}
/* Store position of first unprocessed word. */
*src = run;
return written;
}
weak_alias (__wmemrtombs, wmemrtombs)
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