/*	$OpenBSD: wsetup.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */

/*-

 * 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.

 * 3. 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.

 */

#include <stdio.h>

#include <stdlib.h>

#include <assert.h>

#include "local.h"

/*

 * Various output routines call wsetup to be sure it is safe to write,

 * because either _flags does not include __SWR, or _buf is NULL.

 * _wsetup returns 0 if OK to write, nonzero otherwise.

 */

int

__swsetup(LTTNG_UST_LFILE *fp)

{

	/* make sure stdio is set up */

//	if (!__sdidinit)

//		__sinit();

	/*

	 * If we are not writing, we had better be reading and writing.

	 */

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

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

			return (EOF);

		if (fp->_flags & __SRD) {

			/* clobber any ungetc data */

			if (HASUB(fp))

				FREEUB(fp);

			fp->_flags &= ~(__SRD|__SEOF);

			fp->_r = 0;

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

		}

		fp->_flags |= __SWR;

	}

	/*

	 * Make a buffer if necessary, then set _w.

	 */

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

//		if ((fp->_flags & (__SSTR | __SALC)) == __SSTR)

//			return (EOF);

//		__smakebuf(fp);

		assert(0);

	}

	if (fp->_flags & __SLBF) {

		/*

		 * It is line buffered, so make _lbfsize be -_bufsize

		 * for the putc() macro.  We will change _lbfsize back

		 * to 0 whenever we turn off __SWR.

		 */

		fp->_w = 0;

		fp->_lbfsize = -fp->_bf._size;

	} else

		fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;

	return (0);

}