xref: /titanic_52/usr/src/lib/libc/port/stdio/setbuf.c (revision 7257d1b4d25bfac0c802847390e98a464fd787ac)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5a5f69788Scraigm  * Common Development and Distribution License (the "License").
6a5f69788Scraigm  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
21a5f69788Scraigm 
227c478bd9Sstevel@tonic-gate /*
23*7257d1b4Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
247c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate  */
267c478bd9Sstevel@tonic-gate 
277c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
287c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
297c478bd9Sstevel@tonic-gate 
30a5f69788Scraigm #pragma ident	"%Z%%M%	%I%	%E% SMI"
31a5f69788Scraigm 
32*7257d1b4Sraf #include "lint.h"
337c478bd9Sstevel@tonic-gate #include "file64.h"
347c478bd9Sstevel@tonic-gate #include "mtlib.h"
357c478bd9Sstevel@tonic-gate #include <sys/types.h>
367c478bd9Sstevel@tonic-gate #include <stdio.h>
377c478bd9Sstevel@tonic-gate #include <stdlib.h>
387c478bd9Sstevel@tonic-gate #include <thread.h>
397c478bd9Sstevel@tonic-gate #include <synch.h>
407c478bd9Sstevel@tonic-gate #include "stdiom.h"
417c478bd9Sstevel@tonic-gate 
427c478bd9Sstevel@tonic-gate 
437c478bd9Sstevel@tonic-gate void
447c478bd9Sstevel@tonic-gate setbuf(FILE *iop, char *abuf)
457c478bd9Sstevel@tonic-gate {
467c478bd9Sstevel@tonic-gate 	Uchar *buf = (Uchar *)abuf;
47a5f69788Scraigm 	int fno = GET_FD(iop);  /* file number */
487c478bd9Sstevel@tonic-gate 	int size = BUFSIZ - _SMBFSZ;
497c478bd9Sstevel@tonic-gate 	Uchar *temp;
507c478bd9Sstevel@tonic-gate 	rmutex_t *lk;
517c478bd9Sstevel@tonic-gate 
527c478bd9Sstevel@tonic-gate 	FLOCKFILE(lk, iop);
537c478bd9Sstevel@tonic-gate 	if ((iop->_base != 0) && (iop->_flag & _IOMYBUF))
547c478bd9Sstevel@tonic-gate 		free((char *)iop->_base - PUSHBACK);
557c478bd9Sstevel@tonic-gate 	iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
567c478bd9Sstevel@tonic-gate 	if (buf == 0) {
577c478bd9Sstevel@tonic-gate 		iop->_flag |= _IONBF;
587c478bd9Sstevel@tonic-gate #ifndef _STDIO_ALLOCATE
597c478bd9Sstevel@tonic-gate 		if (fno < 2) {
607c478bd9Sstevel@tonic-gate 			/* use special buffer for std{in,out} */
617c478bd9Sstevel@tonic-gate 			buf = (fno == 0) ? _sibuf : _sobuf;
627c478bd9Sstevel@tonic-gate 		} else	/* needed for ifndef */
637c478bd9Sstevel@tonic-gate #endif
647c478bd9Sstevel@tonic-gate 		if (fno < _NFILE) {
657c478bd9Sstevel@tonic-gate 			buf = _smbuf[fno];
667c478bd9Sstevel@tonic-gate 			size = _SMBFSZ - PUSHBACK;
677c478bd9Sstevel@tonic-gate 		} else
687c478bd9Sstevel@tonic-gate 		if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) != 0) {
697c478bd9Sstevel@tonic-gate 			iop->_flag |= _IOMYBUF;
707c478bd9Sstevel@tonic-gate 			size = _SMBFSZ - PUSHBACK;
717c478bd9Sstevel@tonic-gate 		}
727c478bd9Sstevel@tonic-gate 	} else {	/* regular buffered I/O, standard buffer size */
737c478bd9Sstevel@tonic-gate 		if (isatty(fno))
747c478bd9Sstevel@tonic-gate 			iop->_flag |= _IOLBF;
757c478bd9Sstevel@tonic-gate 	}
767c478bd9Sstevel@tonic-gate 	if (buf == 0) {
777c478bd9Sstevel@tonic-gate 		FUNLOCKFILE(lk);
787c478bd9Sstevel@tonic-gate 		return;		/* malloc() failed */
797c478bd9Sstevel@tonic-gate 	}
807c478bd9Sstevel@tonic-gate 	temp = buf + PUSHBACK;
817c478bd9Sstevel@tonic-gate 	iop->_base = temp;
827c478bd9Sstevel@tonic-gate 	_setbufend(iop, temp + size);
837c478bd9Sstevel@tonic-gate 	iop->_ptr = temp;
847c478bd9Sstevel@tonic-gate 	iop->_cnt = 0;
857c478bd9Sstevel@tonic-gate 	FUNLOCKFILE(lk);
867c478bd9Sstevel@tonic-gate }
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