setbuf.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 1986 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 2.2 */
/*LINTLIBRARY*/
#include <stdio.h>
extern void free();
extern int isatty();
extern unsigned char (*_smbuf)[_SBFSIZ];
extern void _getsmbuf();
void
setbuf(iop, buf)
register FILE *iop;
char *buf;
{
register int fno = fileno(iop); /* file number */
if(iop->_base != NULL && iop->_flag & _IOMYBUF)
free((char*)iop->_base);
iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
if((iop->_base = (unsigned char*)buf) == NULL) {
iop->_flag |= _IONBF; /* file unbuffered except in fastio */
/* use small buffers reserved for this */
iop->_base = _smbuf[fno];
iop->_bufsiz = _SBFSIZ;
}
else { /* regular buffered I/O, standard buffer size */
if (isatty(fno))
iop->_flag |= _IOLBF;
iop->_bufsiz = BUFSIZ;
}
iop->_ptr = iop->_base;
iop->_cnt = 0;
}