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 static int loglevel;
  48 INIT_STDERR_LOGGING(loglevel);
  49
  50 static void open_filters(void)
  51 {
  52         int i;
  53         struct filter_node *fn;
  54
  55         FOR_EACH_FILTER_NODE(fn, fc, i) {
  56                 struct filter *f = filters + fn->filter_num;
  57                 f->open(fn);
  58                 PARA_INFO_LOG("opened %s filter\n", f->name);
  59                 fc->outbufp = &fn->buf;
  60                 fc->out_loaded = &fn->loaded;
  61         }
  62 }
  63
  64 static int init_filter_chain(void)
  65 {
  66         int i, ret;
  67         struct filter_node *fn;
  68
  69         if (!conf.filter_given)
  70                 return -E_NO_FILTERS;
  71         fc->num_filters = conf.filter_given;
  72         fc->filter_nodes = para_malloc(fc->num_filters * sizeof(struct filter_node));
  73         fc->inbufp = &sit->buf;
  74         fc->in_loaded = &sit->loaded;
  75         fc->input_error = &sit->task.error;
  76         fc->task.error = 0;
  77         fc->output_error = &sot->task.error;
  78         fc->task.pre_select = filter_pre_select;
  79         sprintf(fc->task.status, "filter chain");
  80
  81         FOR_EACH_FILTER_NODE(fn, fc, i) {
  82                 char *fa = conf.filter_arg[i];
  83                 fn = fc->filter_nodes + i;
  84                 ret = check_filter_arg(fa, &fn->conf);
  85                 if (ret < 0)
  86                         goto err;
  87                 fn->filter_num = ret;
  88                 fn->fc = fc;
  89                 INIT_LIST_HEAD(&fn->callbacks);
  90                 PARA_DEBUG_LOG("filter #%d: %s\n", i, filters[fn->filter_num].name);
  91         }
  92         open_filters();
  93         return 1;
  94 err:
  95         free(fc->filter_nodes);
  96         return ret;
  97 }
  98
  99 __noreturn static void print_help_and_die(void)
 100 {
 101         int d = conf.detailed_help_given;
 102         const char **p = d? filter_args_info_detailed_help
 103                 : filter_args_info_help;
 104
 105         printf_or_die("%s\n\n", FILTER_CMDLINE_PARSER_PACKAGE "-"
 106                 FILTER_CMDLINE_PARSER_VERSION);
 107         printf_or_die("%s\n\n", filter_args_info_usage);
 108         for (; *p; p++)
 109                 printf_or_die("%s\n", *p);
 110         print_filter_helps(d);
 111         exit(0);
 112 }
 113
 114 static int parse_config(int argc, char *argv[])
 115 {
 116         static char *cf; /* config file */
 117         struct stat statbuf;
 118
 119         if (filter_cmdline_parser(argc, argv, &conf))
 120                 return -E_FILTER_SYNTAX;
 121         HANDLE_VERSION_FLAG("filter", conf);
 122         if (conf.help_given || conf.detailed_help_given)
 123                 print_help_and_die();
 124         if (!cf) {
 125                 char *home = para_homedir();
 126                 cf = make_message("%s/.paraslash/filter.conf", home);
 127                 free(home);
 128         }
 129         if (!stat(cf, &statbuf)) {
 130                 struct filter_cmdline_parser_params params = {
 131                         .override = 0,
 132                         .initialize = 0,
 133                         .check_required = 0,
 134                         .check_ambiguity = 0
 135                 };
 136                 if (filter_cmdline_parser_config_file(cf, &conf, &params))
 137                         return -E_FILTER_SYNTAX;
 138         }
 139         return 1;
 140 }
 141
 142 /**
 143  * The main function of para_filter.
 144  *
 145  * Para_filter reads data from stdin, converts it by using a chain
 146  * of filters (specified on the command line) and writes the resulting
 147  * data to stdout.
 148  *
 149  * \param argc Number of command line options.
 150  * \param argv Vector of arguments.
 151  *
 152  * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
 153  */
 154 int main(int argc, char *argv[])
 155 {
 156         int ret;
 157         static struct sched s;
 158
 159         stdin_set_defaults(sit);
 160         sit->buf = para_malloc(sit->bufsize),
 161
 162         filter_init();
 163         ret = parse_config(argc, argv);
 164         if (ret < 0)
 165                 goto out;
 166         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 167         ret = init_filter_chain();
 168         if (ret < 0)
 169                 goto out;
 170         sit->output_error = &fc->task.error;
 171
 172         stdout_set_defaults(sot);
 173         sot->bufp = fc->outbufp;
 174         sot->loaded = fc->out_loaded;
 175         sot->input_error = &fc->task.error;
 176
 177         register_task(&sit->task);
 178         register_task(&fc->task);
 179         register_task(&sot->task);
 180         s.default_timeout.tv_sec = 1;
 181         s.default_timeout.tv_usec = 0;
 182         ret = schedule(&s);
 183         close_filters(fc);
 184 out:
 185         free(sit->buf);
 186         if (ret < 0)
 187                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 188         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 189 }