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 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #include "lint.h"
33 #include "file64.h"
34 #include "mtlib.h"
35 #include <sys/types.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <thread.h>
39 #include <synch.h>
40 #include "stdiom.h"
41
42 int
setvbuf(FILE * iop,char * abuf,int type,size_t size)43 setvbuf(FILE *iop, char *abuf, int type, size_t size)
44 {
45
46 Uchar *buf = (Uchar *)abuf;
47 Uchar *temp;
48 int sflag = iop->_flag & _IOMYBUF;
49 rmutex_t *lk;
50 int fd = GET_FD(iop);
51
52 FLOCKFILE(lk, iop);
53 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
54 switch (type) {
55 /* note that the flags are the same as the possible values for type */
56 case _IONBF:
57 iop->_flag |= _IONBF; /* file is unbuffered */
58 #ifndef _STDIO_ALLOCATE
59 if (fd < 2) {
60 /* use special buffer for std{in,out} */
61 buf = (fd == 0) ? _sibuf : _sobuf;
62 size = BUFSIZ;
63 } else /* needed for ifdef */
64 #endif
65 if (fd < _NFILE) {
66 buf = _smbuf[fd];
67 size = _SMBFSZ - PUSHBACK;
68 } else
69 if ((buf = malloc(_SMBFSZ * sizeof (Uchar))) != NULL) {
70 iop->_flag |= _IOMYBUF;
71 size = _SMBFSZ - PUSHBACK;
72 } else {
73 FUNLOCKFILE(lk);
74 return (EOF);
75 }
76 break;
77 case _IOLBF:
78 case _IOFBF:
79 iop->_flag |= type; /* buffer file */
80 /*
81 * need at least an 8 character buffer for
82 * out_of_sync concerns.
83 */
84 if (size <= _SMBFSZ) {
85 size = BUFSIZ;
86 buf = NULL;
87 }
88 if (buf == NULL) {
89 if ((buf = malloc(sizeof (Uchar) *
90 (size + _SMBFSZ))) != NULL)
91 iop->_flag |= _IOMYBUF;
92 else {
93 FUNLOCKFILE(lk);
94 return (EOF);
95 }
96 }
97 else
98 size -= _SMBFSZ;
99 break;
100 default:
101 FUNLOCKFILE(lk);
102 return (EOF);
103 }
104 if (iop->_base != NULL && sflag)
105 free((char *)iop->_base - PUSHBACK);
106 temp = buf + PUSHBACK;
107 iop->_base = temp;
108 _setbufend(iop, temp + size);
109 iop->_ptr = temp;
110 iop->_cnt = 0;
111 FUNLOCKFILE(lk);
112 return (0);
113 }
114