/*-

  * 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[] = "@(#)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>

 #include <wchar.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 <fcntl.h>

 #include <unistd.h>

 #include "libc_private.h"

 #include "local.h"

 #include "common_def.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

 /*

   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 * wfreopen(const wchar_t *  file, const wchar_t *  mode,	FILE *fp)	

 {

 	int f;

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

 	char destmode[4];

 	size_t siz;

 	destmode[0] = '\0';

     if(mode==NULL)

     {

     	errno = EINVAL;

 	    (void) fclose(fp);

 		return (NULL);

     }

 	siz = wcstombs(destmode, mode, 4);	

 	if ((flags = __sflags(destmode, &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;

 	}

 	else

 	{

 	/*

 	 * 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 = wopen(file, oflags, DEFFILEMODE);

 		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 = wopen(file, oflags, DEFFILEMODE);        

 			}

 		}

 		sverrno = errno;

 	}

 	/*

 	 * 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);

 	if (fp->_flags & __SMBF)

 		{

 #ifdef __SYMBIAN32__

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

 #else

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

 #endif//__SYMBIAN32__

 		}

 	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);

 }