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/*
* virt_wcsnrtombs.c
*
* $Id: virt_wcsnrtombs.c,v 1.1.1.1 2006/04/11 17:56:16 source Exp $
*
* This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
* project.
*
* Copyright (C) 1998-2006 OpenLink Software
*
* This project 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; only version 2 of the License, dated June 1991.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*
*/
#include "libutil.h"
size_t
virt_wcsnrtombs (unsigned char * dst, wchar_t ** src, size_t nwc, size_t len, virt_mbstate_t *ps)
{
size_t written = 0;
wchar_t *run = src[0];
static virt_mbstate_t internal;
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 = run[0];
run++;
if (wc & ~0x7fffffff)
{
/* This is no correct ISO 10646 character. */
/* errno = (EILSEQ); */
#ifdef MULTIBYTE_SANITY
GPF_T;
#endif
return (size_t) -1;
}
#ifdef MULTIBYTE_SANITY
if (0 == wc)
{
GPF_T;
}
#endif
if (!(wc & ~0x7f))
{
/* 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 & virt_utf8_encoding_mask[step - 2]) == 0)
break;
if (written + step >= len)
{
/* Too long. */
run -= 1;
break;
}
if (dst != NULL)
{
size_t cnt = step;
dst[0] = virt_utf8_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;
}
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