gui: fix default stat command
[paraslash.git] / write_common.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file write_common.c common functions of para_audiod and para_write */
20
21 #include "para.h"
22 #include "string.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "write.h"
26 #include "error.h"
27
28 const char *writer_names[] ={WRITER_NAMES};
29 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
30
31 static void wng_pre_select(__a_unused struct sched *s, struct task *t)
32 {
33 struct writer_node_group *g = t->private_data;
34 int i;
35
36 FOR_EACH_WRITER_NODE(i, g) {
37 struct writer_node *wn = &g->writer_nodes[i];
38 t->ret = wn->writer->pre_select(s, wn);
39 if (t->ret < 0) {
40 g->eof = 1;
41 return;
42 }
43 }
44 }
45
46 static void wng_post_select(struct sched *s, struct task *t)
47 {
48 struct writer_node_group *g = t->private_data;
49 int i;
50 size_t min_written = 0;
51
52 FOR_EACH_WRITER_NODE(i, g) {
53 struct writer_node *wn = &g->writer_nodes[i];
54 t->ret = wn->writer->post_select(s, wn);
55 if (t->ret < 0) {
56 g->eof = 1;
57 return;
58 }
59 if (!i)
60 min_written = wn->written;
61 else
62 min_written = PARA_MIN(min_written, wn->written);
63 }
64 // PARA_INFO_LOG("loaded: %zd, min_written: %zd bytes\n", *g->loaded, min_written);
65 if (min_written) {
66 *g->loaded -= min_written;
67 FOR_EACH_WRITER_NODE(i, g)
68 g->writer_nodes[i].written -= min_written;
69 }
70 if (!*g->loaded && *g->input_eof) {
71 g->eof = 1;
72 t->ret = -E_WNG_EOF;
73 return;
74 }
75 t->ret = 1;
76 if (*g->loaded && min_written) {
77 // PARA_INFO_LOG("moving %zd bytes\n", *g->loaded);
78 memmove(g->buf, g->buf + min_written, *g->loaded);
79 }
80 }
81
82 int wng_open(struct writer_node_group *g)
83 {
84 int i, ret = 1;
85
86 PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g, g->num_writers);
87 register_task(&g->task);
88 FOR_EACH_WRITER_NODE(i, g) {
89 struct writer_node *wn = &g->writer_nodes[i];
90 wn->wng = g;
91 ret = wn->writer->open(wn);
92 if (ret < 0)
93 goto err_out;
94 wn->chunk_bytes = ret;
95 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
96 }
97 sprintf(g->task.status, "%s", "writer node group");
98 g->eof = 0;
99 return 1;
100 err_out:
101 unregister_task(&g->task);
102 while (i > 0) {
103 struct writer_node *wn = &g->writer_nodes[--i];
104 wn->writer->close(wn);
105 }
106 g->num_writers = 0;
107 g->eof = 1;
108 return ret;
109 }
110
111 void wng_unregister(struct writer_node_group *g)
112 {
113 unregister_task(&g->task);
114 g->eof = 1;
115 }
116
117 void wng_close(struct writer_node_group *g)
118 {
119 int i;
120
121 if (!g)
122 return;
123 PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g->num_writers);
124 FOR_EACH_WRITER_NODE(i, g) {
125 struct writer_node *wn = &g->writer_nodes[i];
126 wn->writer->close(wn);
127 }
128 free(g->writer_nodes);
129 free(g);
130 }
131
132 struct writer_node_group *wng_new(unsigned num_writers)
133 {
134 struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
135 g->num_writers = num_writers;
136 g->writer_nodes = para_calloc(num_writers
137 * sizeof(struct writer_node));
138 g->task.private_data = g;
139 g->task.post_select = wng_post_select;
140 g->task.pre_select = wng_pre_select;
141 return g;
142 }
143
144 void init_supported_writers(void)
145 {
146 int i;
147
148 FOR_EACH_WRITER(i)
149 writers[i].init(&writers[i]);
150 }
151
152 void *check_writer_arg(char *wa, int *writer_num)
153 {
154 int i;
155
156 *writer_num = -E_WRITE_COMMON_SYNTAX;
157 PARA_INFO_LOG("checking %s\n", wa);
158 FOR_EACH_WRITER(i) {
159 const char *name = writer_names[i];
160 size_t len = strlen(name);
161 char c;
162 if (strlen(wa) < len)
163 continue;
164 if (strncmp(name, wa, len))
165 continue;
166 c = wa[len];
167 if (c && c != ' ')
168 continue;
169 if (c && !writers[i].parse_config)
170 return NULL;
171 *writer_num = i;
172 return writers[i].parse_config(c? wa + len + 1 : "");
173 }
174 PARA_ERROR_LOG("%s", "writer not found\n");
175 return NULL;
176 }
177
178 struct writer_node_group *setup_default_wng(void)
179 {
180 struct writer_node_group *wng = wng_new(1);
181 enum writer_enum default_writer;
182
183 if (NUM_SUPPORTED_WRITERS == 1)
184 default_writer = FILE_WRITE;
185 else
186 default_writer = 1;
187 wng->writer_nodes[0].writer = &writers[default_writer];
188 PARA_INFO_LOG("using default writer: %s %p\n",
189 writer_names[default_writer], writers[default_writer].parse_config);
190 wng->writer_nodes[0].conf = writers[default_writer].parse_config("");
191 return wng;
192 }