/*-

 * 

 * 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) 2005-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 

 */

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

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

#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>

#ifndef __SYMBIAN32__

__FBSDID("$FreeBSD: src/lib/libc/stdio/freopen.c,v 1.13 2004/05/22 15:19:41 tjr Exp $");

#endif

#include "namespace.h"

#include <sys/types.h>

#include <sys/stat.h>

#ifndef DEFFILEMODE

#define	DEFFILEMODE	(S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)

#endif

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include "un-namespace.h"

#include "libc_private.h"

#include <fcntl.h>

#include <unistd.h>

#include "local.h"

#include "common_def.h"

#ifdef __SYMBIAN32__

#include "sysreent.h"

#endif

#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

/*

 * Re-direct an existing, open (probably) file to some other file.

 * ANSI is written such that the original file gets closed if at

 * all possible, no matter what.

 */

EXPORT_C FILE *

freopen(const char * __restrict file, const char * __restrict mode,	FILE *fp)	

{

	int f;

	int dflags, flags, isopen, oflags, sverrno, wantfd;

	if ((flags = __sflags(mode, &oflags)) == 0) {

		(void) fclose(fp);

		return (NULL);

	}

	FLOCKFILE(fp);

	if (!__sdidinit)

		__sinit();

	/*

	 * If the filename is a NULL pointer, the caller is asking us to

	 * re-open the same file with a different mode. We allow this only

	 * if the modes are compatible.

	 */

	if (file == NULL) {

		/* See comment below regarding freopen() of closed files. */

		if (fp->_flags == 0) {

			FUNLOCKFILE(fp);

			errno = EINVAL;

			return (NULL);

		}

		if ((dflags = _fcntl(fp->_file, F_GETFL)) < 0) {

			sverrno = errno;

			fclose(fp);

			FUNLOCKFILE(fp);

			errno = sverrno;

			return (NULL);

		}

		if ((dflags & O_ACCMODE) != O_RDWR && (dflags & O_ACCMODE) !=

		    (oflags & O_ACCMODE)) {

			fclose(fp);

			FUNLOCKFILE(fp);

			errno = EINVAL;

			return (NULL);

		}

		if ((oflags ^ dflags) & O_APPEND) {

			dflags &= ~O_APPEND;

			dflags |= oflags & O_APPEND;

			if (_fcntl(fp->_file, F_SETFL, dflags) < 0) {

				sverrno = errno;

				fclose(fp);

				FUNLOCKFILE(fp);

				errno = sverrno;

				return (NULL);

			}

		}

		if (oflags & O_TRUNC)

			ftruncate(fp->_file, 0);

		if (_fseeko(fp, 0, oflags & O_APPEND ? SEEK_END : SEEK_SET,

		    0) < 0 && errno != ESPIPE) {

			sverrno = errno;

			fclose(fp);

			FUNLOCKFILE(fp);

			errno = sverrno;

			return (NULL);

		}

		f = fp->_file;

		isopen = 0;

		wantfd = -1;

		goto finish;

	}

	/*

	 * There are actually programs that depend on being able to "freopen"

	 * descriptors that weren't originally open.  Keep this from breaking.

	 * Remember whether the stream was open to begin with, and which file

	 * descriptor (if any) was associated with it.  If it was attached to

	 * a descriptor, defer closing it; freopen("/dev/stdin", "r", stdin)

	 * should work.  This is unnecessary if it was not a Unix file.

	 */

	if (fp->_flags == 0) {

		fp->_flags = __SEOF;	/* hold on to it */

		isopen = 0;

		wantfd = -1;

	} else {

		/* flush the stream; ANSI doesn't require this. */

		if (fp->_flags & __SWR)

			(void) __sflush(fp);

		/* if close is NULL, closing is a no-op, hence pointless */

		isopen = fp->_close != NULL;

		if ((wantfd = fp->_file) < 0 && isopen) {

			(void) (*fp->_close)(fp->_cookie);

			isopen = 0;

		}

	}

	/* Get a new descriptor to refer to the new file. */

	f = _open(file, oflags, DEFFILEMODE);

	#ifdef __SYMBIAN32__

	/* taking care of cases where fd's 0,1,2 have been closed earlier using close*/

	if(f>=0&&f<=2)

		{

		isopen = 0;

		wantfd = -1;

		}

	#endif

	if (f < 0 && isopen) {

		/* If out of fd's close the old one and try again. */

		if (errno == ENFILE || errno == EMFILE) {

			(void) (*fp->_close)(fp->_cookie);

			isopen = 0;

			f = _open(file, oflags, DEFFILEMODE);

		}

	}

	sverrno = errno;

finish:

	/*

	 * Finish closing fp.  Even if the open succeeded above, we cannot

	 * keep fp->_base: it may be the wrong size.  This loses the effect

	 * of any setbuffer calls, but stdio has always done this before.

	 */

	if (isopen)

		(void) (*fp->_close)(fp->_cookie);

	#ifdef __SYMBIAN32__

	if (fp->_flags & __SMBF)

		BackendFree((char *)fp->_bf._base);

	#else

	if (fp->_flags & __SMBF)

		free((char *)fp->_bf._base);

	#endif

	fp->_w = 0;

	fp->_r = 0;

	fp->_p = NULL;

	fp->_bf._base = NULL;

	fp->_bf._size = 0;

	fp->_lbfsize = 0;

	if (HASUB(fp))

		FREEUB(fp);

	fp->_ub._size = 0;

	if (HASLB(fp))

		FREELB(fp);

	fp->_lb._size = 0;

	fp->_extra->orientation = 0;

	memset(&fp->_extra->mbstate, 0, sizeof(mbstate_t));

	if (f < 0) {			/* did not get it after all */

		fp->_flags = 0;		/* set it free */

		errno = sverrno;	/* restore in case _close clobbered */

		FUNLOCKFILE(fp);

		return (NULL);

	}

#ifndef __SYMBIAN32__	

	/*

	 * If reopening something that was open before on a real file, try

	 * to maintain the descriptor.  Various C library routines (perror)

	 * assume stderr is always fd STDERR_FILENO, even if being freopen'd.

	 */

	if (wantfd >= 0 && f != wantfd) {

		if (dup2(f, wantfd) >= 0) {

			(void)_close(f);

			f = wantfd;

		}

	}

#else

		if (wantfd >= 0 && f > wantfd){

			if (dup2(f, wantfd) >= 0) {

				(void)_close(f);

				f = wantfd;		

		}

	}

#endif	

	fp->_flags = flags;

	fp->_file = f;

	fp->_cookie = fp;

	fp->_read = __sread;

	fp->_write = __swrite;

	fp->_seek = __sseek;

	fp->_close = __sclose;

#ifdef __SYMBIAN32__    

    if (oflags & O_TEXT) {

        fp->_extra->fmode = 't';

    }

    else {

        fp->_extra->fmode = 'b';

    }

#endif

	FUNLOCKFILE(fp);

	return (fp);

}