fflush.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
*          Copyright (c) 2020-2024 Contributors to ksh 93u+m           *
*                      and is licensed under the                       *
*                 Eclipse Public License, Version 2.0                  *
*                                                                      *
*                A copy of the License is available at                 *
*      https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html      *
*         (with md5 checksum 84283fa8859daf213bdda5a9f8d1be1d)         *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                  Martijn Dekker <martijn@inlv.org>                   *
*                                                                      *
***********************************************************************/

#ifndef _USE_GNU
#define _USE_GNU
#endif

#include "stdhdr.h"

int
fflush(Sfio_t* f)
{
	if (!f)
		return fcloseall();

	if (f->extent > 0)
		sfseek(f, 0, SEEK_CUR|SFIO_PUBLIC);
	return (sfsync(f) < 0 || sfpurge(f) < 0) ? -1 : 0;
}