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 <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 "filter.h"
  17 #include "string.h"
  18 #include "stdin.h"
  19 #include "stdout.h"
  20 #include "error.h"
  21
  22 /** The list of all status items used by para_{server,audiod,gui}. */
  23 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
  24
  25 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
  26
  27 /** Initialize the array of errors for para_filter. */
  28 INIT_FILTER_ERRLISTS;
  29
  30 /** The task that reads from stdin. */
  31 static struct stdin_task stdin_task_struct;
  32 /** pointer to the stdin task. */
  33 static struct stdin_task *sit = &stdin_task_struct;
  34
  35 /** The task that filters the data. */
  36 static struct filter_chain filter_chain_struct;
  37 /** Pointer to the filter chain. */
  38 static struct filter_chain *fc = &filter_chain_struct;
  39
  40 /** The task that writes converted data to stdout. */
  41 static struct stdout_task stdout_task_struct;
  42 /** Pointer to the stdout task. */
  43 static struct stdout_task *sot = &stdout_task_struct;
  44
  45 /** Gengetopt struct that holds the command line args. */
  46 static struct filter_args_info conf;
  47
  48 static int loglevel;
  49 INIT_STDERR_LOGGING(loglevel);
  50
  51 static void open_filters(void)
  52 {
  53         int i;
  54         struct filter_node *fn;
  55
  56         FOR_EACH_FILTER_NODE(fn, fc, i) {
  57                 struct filter *f = filters + fn->filter_num;
  58                 f->open(fn);
  59                 PARA_INFO_LOG("opened %s filter\n", f->name);
  60                 fc->outbufp = &fn->buf;
  61                 fc->out_loaded = &fn->loaded;
  62         }
  63 }
  64
  65 static int init_filter_chain(void)
  66 {
  67         int i, ret;
  68         struct filter_node *fn;
  69
  70         if (!conf.filter_given)
  71                 return -E_NO_FILTERS;
  72         fc->num_filters = conf.filter_given;
  73         fc->filter_nodes = para_malloc(fc->num_filters * sizeof(struct filter_node));
  74         fc->inbufp = &sit->buf;
  75         fc->in_loaded = &sit->loaded;
  76         fc->input_error = &sit->task.error;
  77         fc->task.error = 0;
  78         fc->output_error = &sot->task.error;
  79         fc->task.pre_select = filter_pre_select;
  80         sprintf(fc->task.status, "filter chain");
  81
  82         FOR_EACH_FILTER_NODE(fn, fc, i) {
  83                 char *fa = conf.filter_arg[i];
  84                 fn = fc->filter_nodes + i;
  85                 ret = check_filter_arg(fa, &fn->conf);
  86                 if (ret < 0)
  87                         goto err;
  88                 fn->filter_num = ret;
  89                 fn->fc = fc;
  90                 INIT_LIST_HEAD(&fn->callbacks);
  91                 PARA_DEBUG_LOG("filter #%d: %s\n", i, filters[fn->filter_num].name);
  92         }
  93         open_filters();
  94         return 1;
  95 err:
  96         free(fc->filter_nodes);
  97         return ret;
  98 }
  99
 100 __noreturn static void print_help_and_die(void)
 101 {
 102         int d = conf.detailed_help_given;
 103         const char **p = d? filter_args_info_detailed_help
 104                 : filter_args_info_help;
 105
 106         printf_or_die("%s\n\n", FILTER_CMDLINE_PARSER_PACKAGE "-"
 107                 FILTER_CMDLINE_PARSER_VERSION);
 108         printf_or_die("%s\n\n", filter_args_info_usage);
 109         for (; *p; p++)
 110                 printf_or_die("%s\n", *p);
 111         print_filter_helps(d);
 112         exit(0);
 113 }
 114
 115 static int parse_config(int argc, char *argv[])
 116 {
 117         static char *cf; /* config file */
 118         struct stat statbuf;
 119
 120         if (filter_cmdline_parser(argc, argv, &conf))
 121                 return -E_FILTER_SYNTAX;
 122         HANDLE_VERSION_FLAG("filter", conf);
 123         if (conf.help_given || conf.detailed_help_given)
 124                 print_help_and_die();
 125         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 126         if (!cf) {
 127                 char *home = para_homedir();
 128                 cf = make_message("%s/.paraslash/filter.conf", home);
 129                 free(home);
 130         }
 131         if (!stat(cf, &statbuf)) {
 132                 struct filter_cmdline_parser_params params = {
 133                         .override = 0,
 134                         .initialize = 0,
 135                         .check_required = 0,
 136                         .check_ambiguity = 0
 137                 };
 138                 if (filter_cmdline_parser_config_file(cf, &conf, &params))
 139                         return -E_FILTER_SYNTAX;
 140         }
 141         return 1;
 142 }
 143
 144 /**
 145  * The main function of para_filter.
 146  *
 147  * Para_filter reads data from stdin, converts it by using a chain
 148  * of filters (specified on the command line) and writes the resulting
 149  * data to stdout.
 150  *
 151  * \param argc Number of command line options.
 152  * \param argv Vector of arguments.
 153  *
 154  * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
 155  */
 156 int main(int argc, char *argv[])
 157 {
 158         int ret;
 159         static struct sched s;
 160
 161         stdin_set_defaults(sit);
 162         sit->buf = para_malloc(sit->bufsize),
 163
 164         filter_init();
 165         ret = parse_config(argc, argv);
 166         if (ret < 0)
 167                 goto out;
 168         ret = init_filter_chain();
 169         if (ret < 0)
 170                 goto out;
 171         sit->output_error = &fc->task.error;
 172
 173         stdout_set_defaults(sot);
 174         sot->bufp = fc->outbufp;
 175         sot->loaded = fc->out_loaded;
 176         sot->input_error = &fc->task.error;
 177
 178         register_task(&sit->task);
 179         register_task(&fc->task);
 180         register_task(&sot->task);
 181         s.default_timeout.tv_sec = 1;
 182         s.default_timeout.tv_usec = 0;
 183         ret = schedule(&s);
 184         close_filters(fc);
 185 out:
 186         free(sit->buf);
 187         if (ret < 0)
 188                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 189         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 190 }