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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma weak __filbuf = _filbuf
#include "lint.h"
#include "file64.h"
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include "stdiom.h"
static int
_xpg4_check(void)
{
extern int __xpg4;
return (__xpg4);
}
/* fill buffer, return first character or EOF */
int
_filbuf(FILE *iop)
{
ssize_t res;
size_t nbyte;
Uchar *endbuf;
#ifdef _LP64
unsigned int flag;
#else
unsigned char flag;
#endif
if (!(iop->_flag & _IOREAD)) { /* check, correct permissions */
if (iop->_flag & _IORW) {
iop->_flag |= _IOREAD; /* change direction */
/* to read - fseek */
} else {
errno = EBADF;
return (EOF);
}
}
if (iop->_base == 0) {
/* Get the buffer and end of buffer */
if ((endbuf = _findbuf(iop)) == 0) {
return (EOF);
}
} else {
endbuf = _bufend(iop);
}
/*
* Flush all line-buffered streams before we
* read no-buffered or line-buffered input.
*/
if (iop->_flag & (_IONBF | _IOLBF))
_flushlbf();
/*
* Changed the get family fns in Solaris 10 to comply with the
* 1990 C Standard and standards based upon it. If the
* end-of-file indicator for the stream is set, or if the stream
* is at end-of-file, the function will return EOF, and the file
* position indicator for the stream will not be advanced.
* Additional bytes appended to the file do not clear the EOF
* indicator.
*/
if ((flag = iop->_flag) & _IOEOF) {
if (_xpg4_check()) {
/*
* A previous read() has returned 0 (below),
* therefore iop->_cnt was set to 0, and the EOF
* indicator was set before returning EOF. Reset
* iop->_cnt to 0; it has likely been changed by
* a function such as getc().
*/
iop->_cnt = 0;
return (EOF);
}
}
/*
* Fill buffer or read 1 byte for unbuffered, handling any errors.
*/
iop->_ptr = iop->_base;
if (flag & _IONBF)
nbyte = 1;
else
nbyte = endbuf - iop->_base;
if ((res = _xread(iop, (char *)iop->_base, nbyte)) > 0) {
iop->_cnt = res - 1;
return (*iop->_ptr++);
}
iop->_cnt = 0;
if (res == 0)
iop->_flag |= _IOEOF;
else if (!cancel_active())
iop->_flag |= _IOERR;
return (EOF);
}
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