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 1997 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30
31 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.3 */
32 /* LINTLIBRARY */
33
34
35 #include <errno.h>
36 #include <fcntl.h>
37 #include <stdio.h>
38 #include "lp.h"
39 #include "msgs.h"
40
41 static fifobuffer_t **FifoBufferTable = NULL;
42 static int FifoBufferTableSize = 0;
43
44 /*
45 ** Local functions
46 */
47 static int InitFifoBufferTable (void);
48 static int GrowFifoBufferTable (int);
49 static fifobuffer_t *NewFifoBuffer (int);
50
51
52 int
ResetFifoBuffer(int fd)53 ResetFifoBuffer(int fd)
54 {
55 if ((!FifoBufferTableSize) && (InitFifoBufferTable () < 0))
56 return -1;
57
58 if (fd >= FifoBufferTableSize)
59 return 0;
60
61 if (FifoBufferTable [fd]) {
62 FifoBufferTable [fd]->full = 0;
63 FifoBufferTable [fd]->psave =
64 FifoBufferTable [fd]->psave_end =
65 FifoBufferTable [fd]->save;
66 }
67 return 0;
68 }
69
70
71 fifobuffer_t *
GetFifoBuffer(int fd)72 GetFifoBuffer(int fd)
73 {
74 if (fd < 0) {
75 errno = EINVAL;
76 return NULL;
77 }
78 if ((fd >= FifoBufferTableSize) && (GrowFifoBufferTable (fd) < 0))
79 return NULL;
80
81 if (!FifoBufferTable [fd]) {
82 if (!NewFifoBuffer (fd))
83 return NULL;
84
85 FifoBufferTable [fd]->full = 0;
86 FifoBufferTable [fd]->psave =
87 FifoBufferTable [fd]->psave_end =
88 FifoBufferTable [fd]->save;
89 }
90
91 return FifoBufferTable [fd];
92 }
93
94
95 static int
InitFifoBufferTable()96 InitFifoBufferTable()
97 {
98 if (FifoBufferTableSize)
99 return 0;
100
101 FifoBufferTable = (fifobuffer_t **)
102 Calloc (100, sizeof (fifobuffer_t *));
103 if (!FifoBufferTable)
104 return -1; /* ENOMEM is already set. */
105
106 FifoBufferTableSize = 100;
107
108 return 0;
109 }
110
111
112 static int
GrowFifoBufferTable(int fd)113 GrowFifoBufferTable (int fd)
114 {
115 fifobuffer_t **newpp;
116
117 newpp = (fifobuffer_t **)
118 Realloc ((void*)FifoBufferTable,
119 (fd+10)*sizeof (fifobuffer_t *));
120 if (!newpp)
121 return -1; /* ENOMEM is already set. */
122
123 FifoBufferTableSize = fd+10;
124
125 return 0;
126 }
127
128
129 static fifobuffer_t *
NewFifoBuffer(int fd)130 NewFifoBuffer(int fd)
131 {
132 int i;
133
134 for (i=0; i < FifoBufferTableSize; i++)
135 {
136 if (FifoBufferTable [i] &&
137 Fcntl (i, F_GETFL) < 0 &&
138 errno == EBADF)
139 {
140 FifoBufferTable [fd] = FifoBufferTable [i];
141 FifoBufferTable [i] = NULL;
142 return FifoBufferTable [fd];
143 }
144 }
145 FifoBufferTable [fd] = (fifobuffer_t *)
146 Calloc (1, sizeof (fifobuffer_t));
147
148 return FifoBufferTable [fd];
149 }
150