/*-

 * 

 * 

 * 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[] = "@(#)makebuf.c	8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>

__FBSDID("$FreeBSD: src/lib/libc/stdio/makebuf.c,v 1.4 2002/03/22 21:53:04 obrien Exp $");

#include <sys/stat.h>

#include "namespace.h"

#include <sys/types.h>

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#ifdef __SYMBIAN32__

#include "sysreent.h"

#endif

#include "local.h"

#include "un-namespace.h"

#ifdef __SYMBIAN32__

#include "common_def.h"

#endif //__SYMBIAN32__

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

#include "libc_wsd_defs.h"

#endif

/*

 * Allocate a file buffer, or switch to unbuffered I/O.

 * Per the ANSI C standard, ALL tty devices default to line buffered.

 *

 * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek

 * optimisation) right after the _fstat() that finds the buffer size.

 */

void

__smakebuf(fp)

	FILE *fp;

{

	void *p;

	int flags;

	size_t size;

	int couldbetty;

	if (fp->_flags & __SNBF) {

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

		fp->_bf._size = 1;

		return;

	}

	flags = __swhatbuf(fp, &size, &couldbetty);

#ifdef __SYMBIAN32__	

	if ((p = BackendAlloc(size)) == NULL) {

#else

	if ((p = malloc(size)) == NULL) {

#endif

#ifndef __SYMBIAN32__

		fp->_flags |= __SNBF;

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

		fp->_bf._size = 1;

#else //__SYMBIAN32__

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

#endif //__SYMBIAN32__

		return;

	}

#ifdef __SYMBIAN32__

	// On Symbian, enable this only for ARM

	#if !defined(__WINSCW__) && !defined(__WINS__)

	__cleanup = _cleanup;

	#endif

#else

	__cleanup = _cleanup;

#endif

	flags |= __SMBF;

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

	fp->_bf._size = size;

#ifdef __SYMBIAN32__

	/* Why try and check if the file is a tty again? */

	if (couldbetty) {

#else	

	if (couldbetty && isatty(fp->_file)) {

#endif	

		flags |= __SLBF;

	}

	fp->_flags |= flags;

}

/*

 * Internal routine to determine `proper' buffering for a file.

 */

int

__swhatbuf(fp, bufsize, couldbetty)

	FILE *fp;

	size_t *bufsize;

	int *couldbetty;

{

	struct stat st;

#ifdef __SYMBIAN32__	

	int err;

	if (fp->_file < 0 || _fstat_r(&err, fp->_file, &st) < 0) {

#else	

	if (fp->_file < 0 || _fstat(fp->_file, &st) < 0) {

#endif	

		*couldbetty = 0;

		*bufsize = BUFSIZ;

		return (__SNPT);

	}

	/* could be a tty iff it is a character device */

	*couldbetty = (st.st_mode & S_IFMT) == S_IFCHR;

	if (st.st_blksize <= 0) {

		*bufsize = BUFSIZ;

		return (__SNPT);

	}

	/*

	 * Optimise fseek() only if it is a regular file.  (The test for

	 * __sseek is mainly paranoia.)  It is safe to set _blksize

	 * unconditionally; it will only be used if __SOPT is also set.

	 */

	*bufsize = st.st_blksize;

	fp->_blksize = st.st_blksize;

	return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?

	    __SOPT : __SNPT);

}