/*-

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

 * Copyright (c) 1990, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek.

 *

 * 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.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.

 * © Portions copyright (c) 2005-2006  Nokia Corporation.  All rights reserved.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)refill.c	8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>

__FBSDID("$FreeBSD: src/lib/libc/stdio/refill.c,v 1.18 2002/08/13 09:30:41 tjr Exp $");

#include "namespace.h"

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include "un-namespace.h"

#include "libc_private.h"

#include "local.h"

#if (defined(__SYMBIAN32__) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libc_wsd_defs.h"

#endif

#ifdef EMULATOR

int *GET_WSD_VAR_NAME(__sdidinit, g)();

#define __sdidinit (*GET_WSD_VAR_NAME(__sdidinit, g)())

#endif //EMULATOR

static int lflush(FILE *);

static int

lflush(FILE *fp)

{

	int	ret = 0;

	if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) {

		FLOCKFILE(fp);

		ret = __sflush(fp);

		FUNLOCKFILE(fp);

	}

	return (ret);

}

/* Validation checks on the FILE

 * Avoid duplication of the code

 */

 int validate(FILE *fp)

	{

	/* make sure stdio is set up */

	if (!__sdidinit)

		__sinit();

	ORIENT(fp, -1);

	fp->_r = 0;		/* largely a convenience for callers */

	/* SysV does not make this test; take it out for compatibility */

	if (fp->_flags & __SEOF)

		return (EOF);

	/* if not already reading, have to be reading and writing */

	if ((fp->_flags & __SRD) == 0) {

		if ((fp->_flags & __SRW) == 0) {

			errno = EBADF;

			fp->_flags |= __SERR;

			return (EOF);

		}

		/* switch to reading */

		if (fp->_flags & __SWR) {

			if (__sflush(fp))

				return (EOF);

			fp->_flags &= ~__SWR;

			fp->_w = 0;

			fp->_lbfsize = 0;

		}

		fp->_flags |= __SRD;

	} else {

		/*

		 * We were reading.  If there is an ungetc buffer,

		 * we must have been reading from that.  Drop it,

		 * restoring the previous buffer (if any).  If there

		 * is anything in that buffer, return.

		 */

		if (HASUB(fp)) {

			FREEUB(fp);

			if ((fp->_r = fp->_ur) != 0) {

				fp->_p = fp->_extra->_up;

				return (0);

			}

		}

	}

	return 1;

}

/*

 * Refill a stdio buffer.

 * Return EOF on eof or error, 0 otherwise.

 */

int

__srefill(FILE *fp)

{

	int i = 0;

	int ret = validate(fp);

	if(ret != 1)

		return (ret);

		if (fp->_bf._base == NULL)

	{

		__smakebuf(fp);

		if(fp->_bf._base == NULL && errno == ENOMEM)

		{

			return (EOF);

		}

	}

	/*

	 * Before reading from a line buffered or unbuffered file,

	 * flush all line buffered output files, per the ANSI C

	 * standard.

	 */

	if (fp->_flags & (__SLBF|__SNBF)) {

		/* Ignore this file in _fwalk to avoid potential deadlock. */

		fp->_flags |= __SIGN;

		(void) _fwalk(lflush);

		fp->_flags &= ~__SIGN;

		/* Now flush this file without locking it. */

		if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))

			__sflush(fp);

	}

	fp->_p = fp->_bf._base;

#ifdef __SYMBIAN32__

	if (fp->_file == 0)

	{

		int offset = 0;

		while(1)

		{

				i = 0;

				offset = _sread(fp, (char *)fp->_p, fp->_bf._size);	

				fp->_r += offset; 

				if(offset < 0)

					goto noinput;

				if(offset > 0)

				{				  

					//Check for back-space

					if(*fp->_p == 0x08)						

					{	

						// Check for back - space at first place

						if(fp->_r == 1)

							fp->_r -=1;					

						else		

							{

							fp->_r -=2;					

							fp->_p -=1;

							}

						continue;

					}

					//Check for new-line

					for (i = 0; i < offset; ++i)

						{

						if (*fp->_p == '\n')

							{

							break;

							}

						fp->_p++;

						}

					if (i != offset)

						{

						fp->_r -= (offset - i);	

						break;

						}

				}

				else

					break;

		}		

		fp->_p -= fp->_r;

		fp->_r += (offset - i);

	}	

	else

	{

		fp->_r = _sread(fp, (char *)fp->_p, fp->_bf._size);	

	}	

#else

	fp->_r = _sread(fp, (char *)fp->_p, fp->_bf._size);

#endif

noinput:

	fp->_flags &= ~__SMOD;	/* buffer contents are again pristine */

	if (fp->_r <= 0) {

		if (fp->_r == 0)

			fp->_flags |= __SEOF;

		else {

			fp->_r = 0;

			fp->_flags |= __SERR;

		}

		return (EOF);

	}

	return (0);

}

#ifdef __SYMBIAN32__

int __read_long(FILE *fp,char *p, size_t *resid)

{

		int w;

		int ret = validate(fp);

		if(ret != 1)

			return (ret);

		w = _sread(fp,p,*resid);

		p+=w;

		fp->_p = fp->_bf._base;

		if (w < *resid) 

		{

			if (w < 0)

				fp->_flags |= __SERR;

			else 

			{

				fp->_flags |= __SEOF;

			}

		*resid-=w;

		return (EOF);

		}	

		*resid-=w;

	return 0;

	}

#endif //if __SYMBIAN32__