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/* $NetBSD: bsd-fflush.c,v 1.1 2007/07/29 14:36:46 joerg Exp $ */
/*-
* Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* This code was developed as part of Google's Summer of Code 2007 program.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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 <unistd.h>
#undef fflush
int
rpl_fflush(FILE *fp)
{
#if defined(__DragonFly__)
struct __FILE_public *fp_ = (struct __FILE_public *)fp;
#else
#define fp_ fp
#endif
off_t pos;
/* NULL pointer or writeable stream: use normal fflush. */
if (fp == NULL || (fp_->_flags & (__SWR | __SRW)) != 0)
return fflush(fp);
/* Get current position, possibly different from file pointer. */
pos = ftello(fp);
if (pos == -1) {
errno = EBADF;
return -1;
}
/* Purge buffers. */
if (fpurge(fp) == EOF)
return -1;
/*
* Disable seek optimisation. This is forces the following
* fseeko to seek the actual position and not realign
* the file pointer on a block boundary.
*/
fp_->_flags |= __SNPT;
return fseeko(fp, pos, SEEK_SET);
}
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