server: Convert com_mvatt() to lopsub.
[paraslash.git] / filter.c
1 /*
2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file filter.c The stand-alone filter program. */
8
9 #include <regex.h>
10
11 #include "para.h"
12 #include "filter.cmdline.h"
13 #include "list.h"
14 #include "sched.h"
15 #include "ggo.h"
16 #include "buffer_tree.h"
17 #include "filter.h"
18 #include "string.h"
19 #include "stdin.h"
20 #include "stdout.h"
21 #include "error.h"
22 #include "version.h"
23
24 /** Array of error strings. */
25 DEFINE_PARA_ERRLIST;
26
27 /** The list of all status items used by para_{server,audiod,gui}. */
28 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
29
30 /**
31 * Dummy version which only contains NULL pointers.
32 *
33 * This is used by the amp filter which first tries to obtain the amplification
34 * value from an element in this array.
35 */
36 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
37
38 /** The task that reads from stdin. */
39 static struct stdin_task stdin_task_struct;
40 /** pointer to the stdin task. */
41 static struct stdin_task *sit = &stdin_task_struct;
42
43 /** The task that writes converted data to stdout. */
44 static struct stdout_task stdout_task_struct;
45 /** Pointer to the stdout task. */
46 static struct stdout_task *sot = &stdout_task_struct;
47
48 /** Gengetopt struct that holds the command line args. */
49 static struct filter_args_info conf;
50
51 static int loglevel;
52 INIT_STDERR_LOGGING(loglevel);
53
54 __noreturn static void print_help_and_die(void)
55 {
56 struct ggo_help h = DEFINE_GGO_HELP(filter);
57 bool d = conf.detailed_help_given;
58
59 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
60 print_filter_helps(d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS);
61 exit(EXIT_SUCCESS);
62 }
63
64 static int parse_config(void)
65 {
66 static char *cf; /* config file */
67 struct stat statbuf;
68
69 version_handle_flag("filter", conf.version_given);
70 if (conf.help_given || conf.detailed_help_given)
71 print_help_and_die();
72 if (!cf) {
73 char *home = para_homedir();
74 cf = make_message("%s/.paraslash/filter.conf", home);
75 free(home);
76 }
77 if (!stat(cf, &statbuf)) {
78 struct filter_cmdline_parser_params params = {
79 .override = 0,
80 .initialize = 0,
81 .check_required = 0,
82 .check_ambiguity = 0,
83 .print_errors = 1
84 };
85 filter_cmdline_parser_config_file(cf, &conf, &params);
86 loglevel = get_loglevel_by_name(conf.loglevel_arg);
87 }
88 if (!conf.filter_given)
89 return -E_NO_FILTERS;
90 return 1;
91 }
92
93 /**
94 * The main function of para_filter.
95 *
96 * Para_filter reads data from stdin, converts it by using a chain
97 * of filters (specified on the command line) and writes the resulting
98 * data to stdout.
99 *
100 * \param argc Number of command line options.
101 * \param argv Vector of arguments.
102 *
103 * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
104 */
105 int main(int argc, char *argv[])
106 {
107 static struct sched s;
108 int i, ret;
109 const struct filter *f;
110 struct btr_node *parent;
111 struct filter_node **fns;
112
113 filter_cmdline_parser(argc, argv, &conf); /* aborts on errors */
114 loglevel = get_loglevel_by_name(conf.loglevel_arg);
115 filter_init();
116 ret = parse_config();
117 if (ret < 0)
118 goto out;
119 sit->btrn = btr_new_node(&(struct btr_node_description)
120 EMBRACE(.name = "stdin"));
121 stdin_task_register(sit, &s);
122
123 fns = para_malloc(conf.filter_given * sizeof(*fns));
124 for (i = 0, parent = sit->btrn; i < conf.filter_given; i++) {
125 char *fa = conf.filter_arg[i];
126 struct filter_node *fn;
127 struct task_info ti;
128
129 fn = fns[i] = para_calloc(sizeof(*fn));
130 ret = check_filter_arg(fa, &fn->conf);
131 if (ret < 0) {
132 free(fn);
133 goto out_cleanup;
134 }
135 fn->filter_num = ret;
136 f = filter_get(fn->filter_num);
137 PARA_DEBUG_LOG("filter #%d: %s\n", i, f->name);
138 fn->btrn = btr_new_node(&(struct btr_node_description)
139 EMBRACE(.name = f->name, .parent = parent,
140 .handler = f->execute, .context = fn));
141 ti.name = f->name;
142 ti.pre_select = f->pre_select;
143 ti.post_select = f->post_select;
144 ti.context = fn;
145 if (f->open)
146 f->open(fn);
147 fn->task = task_register(&ti, &s);
148 parent = fn->btrn;
149 }
150 sot->btrn = btr_new_node(&(struct btr_node_description)
151 EMBRACE(.name = "stdout", .parent = parent));
152 stdout_task_register(sot, &s);
153
154 s.default_timeout.tv_sec = 1;
155 s.default_timeout.tv_usec = 0;
156 btr_log_tree(sit->btrn, LL_INFO);
157 ret = schedule(&s);
158 sched_shutdown(&s);
159 out_cleanup:
160 for (i--; i >= 0; i--) {
161 struct filter_node *fn = fns[i];
162
163 f = filter_get(fn->filter_num);
164 if (f->close)
165 f->close(fn);
166 btr_remove_node(&fn->btrn);
167 if (f->free_config)
168 f->free_config(fn->conf);
169 free(fn);
170 }
171 free(fns);
172 btr_remove_node(&sit->btrn);
173 btr_remove_node(&sot->btrn);
174 out:
175 if (ret < 0)
176 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
177 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
178 }