filter.c

   1 /*
   2  * Copyright (C) 2005-2009 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 "para.h"
  10
  11 #include "filter.cmdline.h"
  12 #include "list.h"
  13 #include "sched.h"
  14 #include "ggo.h"
  15 #include "filter.h"
  16 #include "string.h"
  17 #include "stdin.h"
  18 #include "stdout.h"
  19 #include "error.h"
  20
  21 /** The list of all status items used by para_{server,audiod,gui}. */
  22 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
  23
  24 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
  25
  26 /** Initialize the array of errors for para_filter. */
  27 INIT_FILTER_ERRLISTS;
  28
  29 /** The task that reads from stdin. */
  30 static struct stdin_task stdin_task_struct;
  31 /** pointer to the stdin task. */
  32 static struct stdin_task *sit = &stdin_task_struct;
  33
  34 /** The task that filters the data. */
  35 static struct filter_chain filter_chain_struct;
  36 /** Pointer to the filter chain. */
  37 static struct filter_chain *fc = &filter_chain_struct;
  38
  39 /** The task that writes converted data to stdout. */
  40 static struct stdout_task stdout_task_struct;
  41 /** Pointer to the stdout task. */
  42 static struct stdout_task *sot = &stdout_task_struct;
  43
  44 /** Gengetopt struct that holds the command line args. */
  45 static struct filter_args_info conf;
  46
  47 INIT_STDERR_LOGGING(conf.loglevel_arg);
  48
  49 static void open_filters(void)
  50 {
  51         int i;
  52         struct filter_node *fn;
  53
  54         FOR_EACH_FILTER_NODE(fn, fc, i) {
  55                 struct filter *f = filters + fn->filter_num;
  56                 f->open(fn);
  57                 PARA_INFO_LOG("opened %s filter\n", f->name);
  58                 fc->outbuf = fn->buf;
  59                 fc->out_loaded = &fn->loaded;
  60         }
  61 }
  62
  63 static int init_filter_chain(void)
  64 {
  65         int i, ret;
  66         struct filter_node *fn;
  67
  68         if (!conf.filter_given)
  69                 return -E_NO_FILTERS;
  70         fc->num_filters = conf.filter_given;
  71         fc->filter_nodes = para_malloc(fc->num_filters * sizeof(struct filter_node));
  72         fc->inbuf = sit->buf;
  73         fc->in_loaded = &sit->loaded;
  74         fc->input_error = &sit->task.error;
  75         fc->task.error = 0;
  76         fc->output_error = &sot->task.error;
  77         fc->task.pre_select = filter_pre_select;
  78         sprintf(fc->task.status, "filter chain");
  79
  80         FOR_EACH_FILTER_NODE(fn, fc, i) {
  81                 char *fa = conf.filter_arg[i];
  82                 fn = fc->filter_nodes + i;
  83                 ret = check_filter_arg(fa, &fn->conf);
  84                 if (ret < 0)
  85                         goto err;
  86                 fn->filter_num = ret;
  87                 fn->fc = fc;
  88                 INIT_LIST_HEAD(&fn->callbacks);
  89                 PARA_DEBUG_LOG("filter #%d: %s\n", i, filters[fn->filter_num].name);
  90         }
  91         open_filters();
  92         return 1;
  93 err:
  94         free(fc->filter_nodes);
  95         return ret;
  96 }
  97
  98 __noreturn static void print_help_and_die(void)
  99 {
 100         int d = conf.detailed_help_given;
 101         const char **p = d? filter_args_info_detailed_help
 102                 : filter_args_info_help;
 103
 104         printf_or_die("%s\n\n", FILTER_CMDLINE_PARSER_PACKAGE "-"
 105                 FILTER_CMDLINE_PARSER_VERSION);
 106         printf_or_die("%s\n\n", filter_args_info_usage);
 107         for (; *p; p++)
 108                 printf_or_die("%s\n", *p);
 109         print_filter_helps(d);
 110         exit(0);
 111 }
 112
 113 static int parse_config(int argc, char *argv[])
 114 {
 115         static char *cf; /* config file */
 116         struct stat statbuf;
 117
 118         if (filter_cmdline_parser(argc, argv, &conf))
 119                 return -E_FILTER_SYNTAX;
 120         HANDLE_VERSION_FLAG("filter", conf);
 121         if (conf.help_given || conf.detailed_help_given)
 122                 print_help_and_die();
 123         if (!cf) {
 124                 char *home = para_homedir();
 125                 cf = make_message("%s/.paraslash/filter.conf", home);
 126                 free(home);
 127         }
 128         if (!stat(cf, &statbuf)) {
 129                 struct filter_cmdline_parser_params params = {
 130                         .override = 0,
 131                         .initialize = 0,
 132                         .check_required = 0,
 133                         .check_ambiguity = 0
 134                 };
 135                 if (filter_cmdline_parser_config_file(cf, &conf, &params))
 136                         return -E_FILTER_SYNTAX;
 137         }
 138         return 1;
 139 }
 140
 141 /**
 142  * The main function of para_filter.
 143  *
 144  * Para_filter reads data from stdin, converts it by using a chain
 145  * of filters (specified on the command line) and writes the resulting
 146  * data to stdout.
 147  *
 148  * \param argc Number of command line options.
 149  * \param argv Vector of arguments.
 150  *
 151  * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
 152  */
 153 int main(int argc, char *argv[])
 154 {
 155         int ret;
 156         static struct sched s;
 157
 158         stdin_set_defaults(sit);
 159         sit->buf = para_malloc(sit->bufsize),
 160
 161         filter_init(filters);
 162         ret = parse_config(argc, argv);
 163         if (ret < 0)
 164                 goto out;
 165         ret = init_filter_chain();
 166         if (ret < 0)
 167                 goto out;
 168         sit->output_error = &fc->task.error;
 169
 170         stdout_set_defaults(sot);
 171         sot->buf = fc->outbuf;
 172         sot->loaded = fc->out_loaded;
 173         sot->input_error = &fc->task.error;
 174
 175         register_task(&sit->task);
 176         register_task(&fc->task);
 177         register_task(&sot->task);
 178         s.default_timeout.tv_sec = 1;
 179         s.default_timeout.tv_usec = 0;
 180         ret = schedule(&s);
 181         close_filters(fc);
 182 out:
 183         free(sit->buf);
 184         if (ret < 0)
 185                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 186         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 187 }