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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1986 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */
31
32 /*LINTLIBRARY*/
33 #include <stdio.h>
34
35 extern void free();
36 extern unsigned char (*_smbuf)[_SBFSIZ];
37 extern char *malloc();
38 extern void _getsmbuf();
39
40 int
setvbuf(iop,buf,type,size)41 setvbuf(iop, buf, type, size)
42 register FILE *iop;
43 register char *buf;
44 register int type;
45 register int size;
46 {
47 register int fno = fileno(iop); /* file number */
48
49 if(iop->_base != NULL && iop->_flag & _IOMYBUF)
50 free((char*)iop->_base);
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 /* file is unbuffered except in fastio */
56 iop->_flag |= _IONBF;
57 /* use small buffers reserved for this */
58 iop->_base = _smbuf[fno];
59 iop->_bufsiz = _SBFSIZ;
60 break;
61 case _IOLBF:
62 case _IOFBF:
63 if (size < 0)
64 return -1;
65 iop->_flag |= type;
66 size = (size == 0) ? BUFSIZ : size;
67 /*
68 * need eight characters beyond bufend for stdio slop
69 */
70 if (size <= 8) {
71 size = BUFSIZ;
72 buf = NULL;
73 }
74 if (buf == NULL) {
75 size += 8;
76 buf = malloc((unsigned)size);
77 iop->_flag |= _IOMYBUF;
78 }
79 iop->_base = (unsigned char *)buf;
80 iop->_bufsiz = size - 8;
81 break;
82 default:
83 return -1;
84 }
85 iop->_ptr = iop->_base;
86 iop->_cnt = 0;
87 return 0;
88 }
89