setbuffer.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*LINTLIBRARY*/
#include <sys/types.h>
#include "file64.h"
#include <stdio.h>
#include "stdiom.h"
#include <stdlib.h>
extern Uchar _smbuf[][_NFILE];
void
setbuffer(FILE *iop, char *abuf, int asize)
{
Uchar *buf = (Uchar *)abuf;
int fno = iop->_file; /* file number */
int size = asize - _SMBFSZ;
Uchar *temp;
if (iop->_base != 0 && iop->_flag & _IOMYBUF)
free((char *)iop->_base - PUSHBACK);
iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
if (buf == 0) {
iop->_flag |= _IONBF;
#ifndef _STDIO_ALLOCATE
if (fno < 2) {
/* use special buffer for std{in,out} */
buf = (fno == 0) ? _sibuf : _sobuf;
size = BUFSIZ - _SMBFSZ;
} else /* needed for ifdef */
#endif
if (fno < _NFILE) {
buf = _smbuf[fno];
size = _SMBFSZ - PUSHBACK;
} else if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) !=
0) {
iop->_flag |= _IOMYBUF;
size = _SMBFSZ - PUSHBACK;
}
} else /* regular buffered I/O, specified buffer size */ {
if (size <= 0)
return;
}
if (buf == 0)
return; /* malloc() failed */
temp = buf + PUSHBACK;
iop->_base = temp;
_setbufend(iop, temp + size);
iop->_ptr = temp;
iop->_cnt = 0;
}
/*
* set line buffering
*/
int
setlinebuf(FILE *iop)
{
char *buf;
(void) fflush(iop);
setbuffer(iop, (char *)NULL, 0);
buf = (char *)malloc(128);
if (buf != NULL) {
setbuffer(iop, buf, 128);
iop->_flag |= _IOLBF|_IOMYBUF;
}
return (0); /* returns no useful value, keep the same prototype */
}