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 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include "streams_array.h"
28 #include "streams_common.h"
29
30 /*
31 * Single-byte character memory map-based streams implementation
32 */
33
34 static int
stream_array_prime(stream_t * str)35 stream_array_prime(stream_t *str)
36 {
37 ASSERT((str->s_status & STREAM_SOURCE_MASK) == STREAM_ARRAY);
38
39 str->s_type.LA.s_cur_index = MIN(0, str->s_type.LA.s_array_size - 1);
40 if (str->s_type.LA.s_cur_index >= 0)
41 copy_line_rec(
42 str->s_type.LA.s_array[str->s_type.LA.s_cur_index],
43 &str->s_current);
44 else {
45 stream_set(str, STREAM_EOS_REACHED);
46 stream_unset(str, STREAM_PRIMED);
47 return (PRIME_FAILED_EMPTY_FILE);
48 }
49
50 stream_set(str, STREAM_PRIMED);
51
52 return (PRIME_SUCCEEDED);
53 }
54
55 static ssize_t
stream_array_fetch(stream_t * str)56 stream_array_fetch(stream_t *str)
57 {
58 ASSERT(str->s_status & STREAM_OPEN);
59 ASSERT(str->s_type.LA.s_cur_index < str->s_type.LA.s_array_size);
60
61 if (++str->s_type.LA.s_cur_index == str->s_type.LA.s_array_size - 1)
62 stream_set(str, STREAM_EOS_REACHED);
63
64 copy_line_rec(str->s_type.LA.s_array[str->s_type.LA.s_cur_index],
65 &str->s_current);
66
67 return (NEXT_LINE_COMPLETE);
68 }
69
70 /*ARGSUSED*/
71 static int
stream_array_is_closable(stream_t * str)72 stream_array_is_closable(stream_t *str)
73 {
74 /*
75 * Array streams are not closable. That is, there is no open file
76 * descriptor directly associated with an array stream.
77 */
78 return (0);
79 }
80
81 static int
stream_array_close(stream_t * str)82 stream_array_close(stream_t *str)
83 {
84 stream_unset(str, STREAM_OPEN | STREAM_PRIMED);
85
86 return (1);
87 }
88
89 static int
stream_array_free(stream_t * str)90 stream_array_free(stream_t *str)
91 {
92 /*
93 * It's now safe for us to close the various streams backing the array
94 * stream's data.
95 */
96 stream_unset(str, STREAM_PRIMED | STREAM_NOT_FREEABLE);
97
98 return (1);
99 }
100
101 static int
stream_array_eos(stream_t * str)102 stream_array_eos(stream_t *str)
103 {
104 int retval = 0;
105
106 if (str == NULL || str->s_status & STREAM_EOS_REACHED)
107 return (1);
108
109 if (str->s_type.LA.s_cur_index + 1 >= str->s_type.LA.s_array_size) {
110 retval = 1;
111 stream_set(str, STREAM_EOS_REACHED);
112 }
113
114 return (retval);
115 }
116
117 /*ARGSUSED*/
118 static void
stream_array_release_line(stream_t * str)119 stream_array_release_line(stream_t *str)
120 {
121 }
122
123 const stream_ops_t stream_array_ops = {
124 stream_array_is_closable,
125 stream_array_close,
126 stream_array_eos,
127 stream_array_fetch,
128 NULL,
129 stream_array_free,
130 NULL,
131 stream_array_prime,
132 NULL,
133 stream_array_release_line,
134 NULL,
135 NULL
136 };
137