1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Copyright 2020 Robert Mustacchi
32 */
33
34 #include "lint.h"
35 #include "file64.h"
36 #include "mtlib.h"
37 #include <sys/types.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <thread.h>
41 #include <synch.h>
42 #include "stdiom.h"
43
44 void
setbuf(FILE * iop,char * abuf)45 setbuf(FILE *iop, char *abuf)
46 {
47 Uchar *buf = (Uchar *)abuf;
48 int fno = _get_fd(iop); /* file number */
49 int size = BUFSIZ - _SMBFSZ;
50 Uchar *temp;
51 rmutex_t *lk;
52
53 FLOCKFILE(lk, iop);
54 if ((iop->_base != NULL) && (iop->_flag & _IOMYBUF))
55 free((char *)iop->_base - PUSHBACK);
56 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
57 if (buf == NULL) {
58 iop->_flag |= _IONBF;
59 if (fno == 0 || fno == 1) {
60 /* use special buffer for std{in,out} */
61 buf = (fno == 0) ? _sibuf : _sobuf;
62 } else if (fno >= 2 && fno < _NFILE) {
63 buf = _smbuf[fno];
64 size = _SMBFSZ - PUSHBACK;
65 } else if ((buf = (Uchar *)malloc(_SMBFSZ *
66 sizeof (Uchar))) != NULL) {
67 iop->_flag |= _IOMYBUF;
68 size = _SMBFSZ - PUSHBACK;
69 }
70 } else { /* regular buffered I/O, standard buffer size */
71 if (fno != -1 && isatty(fno))
72 iop->_flag |= _IOLBF;
73 }
74 if (buf == NULL) {
75 FUNLOCKFILE(lk);
76 return; /* malloc() failed */
77 }
78 temp = buf + PUSHBACK;
79 iop->_base = temp;
80 _setbufend(iop, temp + size);
81 iop->_ptr = temp;
82 iop->_cnt = 0;
83 FUNLOCKFILE(lk);
84 }
85