/*-

 * © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 * 

 * Copyright (c) 2002-2004 Tim J. Robbins.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include <sys/cdefs.h>

__FBSDID("$FreeBSD: src/lib/libc/stdio/fgetws.c,v 1.6 2004/10/03 15:48:32 stefanf Exp $");

#include "namespace.h"

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <wchar.h>

#include "un-namespace.h"

#include "libc_private.h"

#include "local.h"

#ifndef __SYMBIAN32__

#include "mblocal.h"

#endif //__SYMBIAN32__

EXPORT_C wchar_t *

fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)

{

	wchar_t *wsp;

	size_t nconv;

	const char *src;

	unsigned char *nl;

	FLOCKFILE(fp);

	ORIENT(fp, 1);

	if (n <= 0) {

		errno = EINVAL;

		goto error;

	}

	if (fp->_r <= 0 && __srefill(fp))

		/* EOF */

		goto error;

	wsp = ws;

	do {

#ifndef __SYMBIAN32__	    

		src = fp->_p;

#else //__SYMBIAN32__

		src = (const char *)fp->_p;

#endif //__SYMBIAN32__

		nl = memchr(fp->_p, '\n', fp->_r);

#ifndef __SYMBIAN32__

		nconv = __mbsnrtowcs(wsp, &src,

		    nl != NULL ? (nl - fp->_p + 1) : fp->_r,

		    n - 1, &fp->_extra->mbstate);

#else //__SYMBIAN32__

		nconv = mbsnrtowcs(wsp, &src,

		    nl != NULL ? (nl - fp->_p + 1) : fp->_r,

		    n - 1, &fp->_extra->mbstate);

#endif //__SYMBIAN32__

		if (nconv == (size_t)-1)

			/* Conversion error */

			goto error;

		if (src == NULL) {

			/*

			 * We hit a null byte. Increment the character count,

			 * since mbsnrtowcs()'s return value doesn't include

			 * the terminating null, then resume conversion

			 * after the null.

			 */

			nconv++;

			src = memchr(fp->_p, '\0', fp->_r);

			src++;

		}

		fp->_r -= (unsigned char *)src - fp->_p;

		fp->_p = (unsigned char *)src;

		n -= nconv;

		wsp += nconv;

	} while (wsp[-1] != L'\n' && n > 1 && (fp->_r > 0 ||

	    __srefill(fp) == 0));

	if (wsp == ws)

		/* EOF */

		goto error;

#ifndef __SYMBIAN32__	

	if (!__mbsinit(&fp->_extra->mbstate))

#else //__SYMBIAN32__

	if (!mbsinit(&fp->_extra->mbstate))

#endif //__SYMBIAN32__

		/* Incomplete character */

		goto error;

	*wsp++ = L'\0';

	FUNLOCKFILE(fp);

	return (ws);

error:

	FUNLOCKFILE(fp);

	return (NULL);

}