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 #include "lint.h"
31 #include "file64.h"
32 #include "mtlib.h"
33 #include <sys/types.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <thread.h>
37 #include <synch.h>
38 #include "stdiom.h"
39
40 int
setvbuf(FILE * iop,char * abuf,int type,size_t size)41 setvbuf(FILE *iop, char *abuf, int type, size_t size)
42 {
43
44 Uchar *buf = (Uchar *)abuf;
45 Uchar *temp;
46 int sflag = iop->_flag & _IOMYBUF;
47 rmutex_t *lk;
48 int fd = _get_fd(iop);
49
50 FLOCKFILE(lk, iop);
51 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
52 switch (type) {
53 /* note that the flags are the same as the possible values for type */
54 case _IONBF:
55 iop->_flag |= _IONBF; /* file is unbuffered */
56 if (fd == 0 || fd == 1) {
57 /* use special buffer for std{in,out} */
58 buf = (fd == 0) ? _sibuf : _sobuf;
59 size = BUFSIZ;
60 } else if (fd >= 2 && fd < _NFILE) {
61 buf = _smbuf[fd];
62 size = _SMBFSZ - PUSHBACK;
63 } else {
64 if ((buf = malloc(_SMBFSZ * sizeof (Uchar))) != NULL) {
65 iop->_flag |= _IOMYBUF;
66 size = _SMBFSZ - PUSHBACK;
67 } else {
68 FUNLOCKFILE(lk);
69 return (EOF);
70 }
71 }
72 break;
73 case _IOLBF:
74 case _IOFBF:
75 iop->_flag |= type; /* buffer file */
76 /*
77 * need at least an 8 character buffer for
78 * out_of_sync concerns.
79 */
80 if (size <= _SMBFSZ) {
81 size = BUFSIZ;
82 buf = NULL;
83 }
84 if (buf == NULL) {
85 if ((buf = malloc(sizeof (Uchar) *
86 (size + _SMBFSZ))) != NULL)
87 iop->_flag |= _IOMYBUF;
88 else {
89 FUNLOCKFILE(lk);
90 return (EOF);
91 }
92 }
93 else
94 size -= _SMBFSZ;
95 break;
96 default:
97 FUNLOCKFILE(lk);
98 return (EOF);
99 }
100 if (iop->_base != NULL && sflag)
101 free((char *)iop->_base - PUSHBACK);
102 temp = buf + PUSHBACK;
103 iop->_base = temp;
104 _setbufend(iop, temp + size);
105 iop->_ptr = temp;
106 iop->_cnt = 0;
107 FUNLOCKFILE(lk);
108 return (0);
109 }
110