Avoid unwanted log messages during startup.
[paraslash.git] / filter.c
1 /*
2 * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
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 /** The list of all status items used by para_{server,audiod,gui}. */
25 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
26
27 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
28
29 /** Initialize the array of errors for para_filter. */
30 INIT_FILTER_ERRLISTS;
31
32 /** The task that reads from stdin. */
33 static struct stdin_task stdin_task_struct;
34 /** pointer to the stdin task. */
35 static struct stdin_task *sit = &stdin_task_struct;
36
37 /** The task that writes converted data to stdout. */
38 static struct stdout_task stdout_task_struct;
39 /** Pointer to the stdout task. */
40 static struct stdout_task *sot = &stdout_task_struct;
41
42 /** Gengetopt struct that holds the command line args. */
43 static struct filter_args_info conf;
44
45 static int loglevel;
46 INIT_STDERR_LOGGING(loglevel);
47
48 __noreturn static void print_help_and_die(void)
49 {
50 int d = conf.detailed_help_given;
51 const char **p = d? filter_args_info_detailed_help
52 : filter_args_info_help;
53
54 printf_or_die("%s\n\n", FILTER_CMDLINE_PARSER_PACKAGE "-"
55 FILTER_CMDLINE_PARSER_VERSION);
56 printf_or_die("%s\n\n", filter_args_info_usage);
57 for (; *p; p++)
58 printf_or_die("%s\n", *p);
59 print_filter_helps(d);
60 exit(0);
61 }
62
63 static int parse_config(void)
64 {
65 static char *cf; /* config file */
66 struct stat statbuf;
67
68 HANDLE_VERSION_FLAG("filter", conf);
69 if (conf.help_given || conf.detailed_help_given)
70 print_help_and_die();
71 if (!cf) {
72 char *home = para_homedir();
73 cf = make_message("%s/.paraslash/filter.conf", home);
74 free(home);
75 }
76 if (!stat(cf, &statbuf)) {
77 struct filter_cmdline_parser_params params = {
78 .override = 0,
79 .initialize = 0,
80 .check_required = 0,
81 .check_ambiguity = 0,
82 .print_errors = 1
83 };
84 filter_cmdline_parser_config_file(cf, &conf, &params);
85 loglevel = get_loglevel_by_name(conf.loglevel_arg);
86 }
87 if (!conf.filter_given)
88 return -E_NO_FILTERS;
89 return 1;
90 }
91
92 /**
93 * The main function of para_filter.
94 *
95 * Para_filter reads data from stdin, converts it by using a chain
96 * of filters (specified on the command line) and writes the resulting
97 * data to stdout.
98 *
99 * \param argc Number of command line options.
100 * \param argv Vector of arguments.
101 *
102 * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
103 */
104 int main(int argc, char *argv[])
105 {
106 static struct sched s;
107 int i, ret;
108 struct filter *f;
109 struct btr_node *parent;
110 struct filter_node **fns;
111
112 filter_cmdline_parser(argc, argv, &conf); /* aborts on errors */
113 loglevel = get_loglevel_by_name(conf.loglevel_arg);
114 filter_init();
115 ret = parse_config();
116 if (ret < 0)
117 goto out;
118 sit->btrn = btr_new_node(&(struct btr_node_description)
119 EMBRACE(.name = "stdin"));
120 stdin_set_defaults(sit);
121 register_task(&s, &sit->task);
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
128 fn = fns[i] = para_calloc(sizeof(*fn));
129 ret = check_filter_arg(fa, &fn->conf);
130 if (ret < 0) {
131 free(fn);
132 goto out_cleanup;
133 }
134 fn->filter_num = ret;
135 f = filters + fn->filter_num;
136 sprintf(fn->task.status, "%s", f->name);
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 fn->task.pre_select = f->pre_select;
142 fn->task.post_select = f->post_select;
143 f->open(fn);
144 register_task(&s, &fn->task);
145 parent = fn->btrn;
146 }
147 sot->btrn = btr_new_node(&(struct btr_node_description)
148 EMBRACE(.name = "stdout", .parent = parent));
149 stdout_set_defaults(sot);
150 register_task(&s, &sot->task);
151
152 s.default_timeout.tv_sec = 1;
153 s.default_timeout.tv_usec = 0;
154 btr_log_tree(sit->btrn, LL_INFO);
155 ret = schedule(&s);
156 out_cleanup:
157 for (i--; i >= 0; i--) {
158 struct filter_node *fn = fns[i];
159
160 f = filters + fn->filter_num;
161 if (f->close)
162 f->close(fn);
163 btr_remove_node(&fn->btrn);
164 if (f->free_config)
165 f->free_config(fn->conf);
166 free(fn);
167 }
168 free(fns);
169 btr_remove_node(&sit->btrn);
170 btr_remove_node(&sot->btrn);
171 out:
172 if (ret < 0)
173 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
174 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
175 }