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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
22 /* All Rights Reserved */
23
24 /*
25 * University Copyright- Copyright (c) 1982, 1986, 1988
26 * The Regents of the University of California
27 * All Rights Reserved
28 *
29 * University Acknowledgment- Portions of this document are derived from
30 * software developed by the University of California, Berkeley, and its
31 * contributors.
32 */
33
34 /*
35 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
36 * Use is subject to license terms.
37 */
38
39 /*LINTLIBRARY*/
40
41 #include <sys/types.h>
42 #include "file64.h"
43 #include <stdio.h>
44 #include "stdiom.h"
45 #include <stdlib.h>
46
47 extern Uchar _smbuf[][_NFILE];
48
49 void
setbuffer(FILE * iop,char * abuf,int asize)50 setbuffer(FILE *iop, char *abuf, int asize)
51 {
52 Uchar *buf = (Uchar *)abuf;
53 int fno = fileno(iop); /* file number */
54 int size = asize - _SMBFSZ;
55 Uchar *temp;
56
57 if (iop->_base != 0 && iop->_flag & _IOMYBUF)
58 free((char *)iop->_base - PUSHBACK);
59 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
60 if (buf == 0) {
61 iop->_flag |= _IONBF;
62 if (fno < 2) {
63 /* use special buffer for std{in,out} */
64 buf = (fno == 0) ? _sibuf : _sobuf;
65 size = BUFSIZ - _SMBFSZ;
66 } else if (fno < _NFILE) {
67 buf = _smbuf[fno];
68 size = _SMBFSZ - PUSHBACK;
69 } else if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) !=
70 0) {
71 iop->_flag |= _IOMYBUF;
72 size = _SMBFSZ - PUSHBACK;
73 }
74 } else /* regular buffered I/O, specified buffer size */ {
75 if (size <= 0)
76 return;
77 }
78 if (buf == 0)
79 return; /* malloc() failed */
80 temp = buf + PUSHBACK;
81 iop->_base = temp;
82 _setbufend(iop, temp + size);
83 iop->_ptr = temp;
84 iop->_cnt = 0;
85 }
86
87 /*
88 * set line buffering
89 */
90
91 int
setlinebuf(FILE * iop)92 setlinebuf(FILE *iop)
93 {
94 char *buf;
95
96 (void) fflush(iop);
97 setbuffer(iop, (char *)NULL, 0);
98 buf = (char *)malloc(128);
99 if (buf != NULL) {
100 setbuffer(iop, buf, 128);
101 iop->_flag |= _IOLBF|_IOMYBUF;
102 }
103 return (0); /* returns no useful value, keep the same prototype */
104 }
105