[lttng-ust.git] / snprintf / wsetup.c

/*	$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);
}
Commit	Line	Data
bf0d695d PMF	1	/* $OpenBSD: wsetup.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */
	2	/*-
	3	* Copyright (c) 1990, 1993
	4	* The Regents of the University of California. All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* Chris Torek.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
	17	* 3. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#include <stdio.h>
	35	#include <stdlib.h>
	36	#include <assert.h>
	37	#include "local.h"
	38
	39	/*
	40	* Various output routines call wsetup to be sure it is safe to write,
	41	* because either _flags does not include __SWR, or _buf is NULL.
	42	* _wsetup returns 0 if OK to write, nonzero otherwise.
	43	*/
	44	int
002e1fde	45	__swsetup(LTTNG_UST_LFILE *fp)
bf0d695d PMF	46	{
	47	/* make sure stdio is set up */
	48	// if (!__sdidinit)
	49	// __sinit();
	50
	51	/*
	52	* If we are not writing, we had better be reading and writing.
	53	*/
	54	if ((fp->_flags & __SWR) == 0) {
	55	if ((fp->_flags & __SRW) == 0)
	56	return (EOF);
	57	if (fp->_flags & __SRD) {
	58	/* clobber any ungetc data */
	59	if (HASUB(fp))
	60	FREEUB(fp);
	61	fp->_flags &= ~(__SRD\|__SEOF);
	62	fp->_r = 0;
	63	fp->_p = fp->_bf._base;
	64	}
	65	fp->_flags \|= __SWR;
	66	}
	67
	68	/*
	69	* Make a buffer if necessary, then set _w.
	70	*/
	71	if (fp->_bf._base == NULL) {
	72	// if ((fp->_flags & (__SSTR \| __SALC)) == __SSTR)
	73	// return (EOF);
	74	// __smakebuf(fp);
	75	assert(0);
	76	}
	77	if (fp->_flags & __SLBF) {
	78	/*
	79	* It is line buffered, so make _lbfsize be -_bufsize
	80	* for the putc() macro. We will change _lbfsize back
	81	* to 0 whenever we turn off __SWR.
	82	*/
	83	fp->_w = 0;
	84	fp->_lbfsize = -fp->_bf._size;
	85	} else
	86	fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
	87	return (0);
	88	}