[ust.git] / snprintf / fflush.c

/*	$OpenBSD: fflush.c,v 1.7 2009/10/22 01:23:16 guenther 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 <errno.h>
#include <stdio.h>
#include "local.h"

/* Flush a single file, or (if fp is NULL) all files.  */
int ust_safe_fflush(LFILE *fp)
{

	if (fp == NULL)
		return 0;
//		return (_fwalk(__sflush));
	if ((fp->_flags & (__SWR | __SRW)) == 0) {
		errno = EBADF;
		return (EOF);
	}
	return (__sflush(fp));
}

int
__sflush(LFILE *fp)
{
	unsigned char *p;
	int n, t;

	t = fp->_flags;
	if ((t & __SWR) == 0)
		return (0);

	if ((p = fp->_bf._base) == NULL)
		return (0);

	n = fp->_p - p;		/* write this much */

	/*
	 * Set these immediately to avoid problems with longjmp and to allow
	 * exchange buffering (via setvbuf) in user write function.
	 */
	fp->_p = p;
	fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;

	for (; n > 0; n -= t, p += t) {
		t = (*fp->_write)(fp->_cookie, (char *)p, n);
		if (t <= 0) {
			fp->_flags |= __SERR;
			return (EOF);
		}
	}
	return (0);
}
Commit	Line	Data
	1	/* $OpenBSD: fflush.c,v 1.7 2009/10/22 01:23:16 guenther 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 <errno.h>
	35	#include <stdio.h>
	36	#include "local.h"
	37
	38	/* Flush a single file, or (if fp is NULL) all files. */
	39	int ust_safe_fflush(LFILE *fp)
	40	{
	41
	42	if (fp == NULL)
	43	return 0;
	44	// return (_fwalk(__sflush));
	45	if ((fp->_flags & (__SWR \| __SRW)) == 0) {
	46	errno = EBADF;
	47	return (EOF);
	48	}
	49	return (__sflush(fp));
	50	}
	51
	52	int
	53	__sflush(LFILE *fp)
	54	{
	55	unsigned char *p;
	56	int n, t;
	57
	58	t = fp->_flags;
	59	if ((t & __SWR) == 0)
	60	return (0);
	61
	62	if ((p = fp->_bf._base) == NULL)
	63	return (0);
	64
	65	n = fp->_p - p; /* write this much */
	66
	67	/*
	68	* Set these immediately to avoid problems with longjmp and to allow
	69	* exchange buffering (via setvbuf) in user write function.
	70	*/
	71	fp->_p = p;
	72	fp->_w = t & (__SLBF\|__SNBF) ? 0 : fp->_bf._size;
	73
	74	for (; n > 0; n -= t, p += t) {
	75	t = (fp->_write)(fp->_cookie, (char )p, n);
	76	if (t <= 0) {
	77	fp->_flags \|= __SERR;
	78	return (EOF);
	79	}
	80	}
	81	return (0);
	82	}