filter.c

   1 /*
   2  * Copyright (C) 2005-2011 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 #include <stdbool.h>
  11
  12 #include "para.h"
  13 #include "filter.cmdline.h"
  14 #include "list.h"
  15 #include "sched.h"
  16 #include "ggo.h"
  17 #include "buffer_tree.h"
  18 #include "filter.h"
  19 #include "string.h"
  20 #include "stdin.h"
  21 #include "stdout.h"
  22 #include "error.h"
  23 #include "version.h"
  24
  25 /** The list of all status items used by para_{server,audiod,gui}. */
  26 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
  27
  28 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
  29
  30 /** Initialize the array of errors for para_filter. */
  31 INIT_FILTER_ERRLISTS;
  32
  33 /** The task that reads from stdin. */
  34 static struct stdin_task stdin_task_struct;
  35 /** pointer to the stdin task. */
  36 static struct stdin_task *sit = &stdin_task_struct;
  37
  38 /** The task that writes converted data to stdout. */
  39 static struct stdout_task stdout_task_struct;
  40 /** Pointer to the stdout task. */
  41 static struct stdout_task *sot = &stdout_task_struct;
  42
  43 /** Gengetopt struct that holds the command line args. */
  44 static struct filter_args_info conf;
  45
  46 static int loglevel;
  47 INIT_STDERR_LOGGING(loglevel);
  48
  49 __noreturn static void print_help_and_die(void)
  50 {
  51         int d = conf.detailed_help_given;
  52         const char **p = d? filter_args_info_detailed_help
  53                 : filter_args_info_help;
  54
  55         printf_or_die("%s\n\n", FILTER_CMDLINE_PARSER_PACKAGE "-"
  56                 FILTER_CMDLINE_PARSER_VERSION);
  57         printf_or_die("%s\n\n", filter_args_info_usage);
  58         for (; *p; p++)
  59                 printf_or_die("%s\n", *p);
  60         print_filter_helps(d);
  61         exit(0);
  62 }
  63
  64 static int parse_config(int argc, char *argv[])
  65 {
  66         static char *cf; /* config file */
  67         struct stat statbuf;
  68
  69         if (filter_cmdline_parser(argc, argv, &conf))
  70                 return -E_FILTER_SYNTAX;
  71         HANDLE_VERSION_FLAG("filter", conf);
  72         if (conf.help_given || conf.detailed_help_given)
  73                 print_help_and_die();
  74         loglevel = get_loglevel_by_name(conf.loglevel_arg);
  75         if (!cf) {
  76                 char *home = para_homedir();
  77                 cf = make_message("%s/.paraslash/filter.conf", home);
  78                 free(home);
  79         }
  80         if (!stat(cf, &statbuf)) {
  81                 struct filter_cmdline_parser_params params = {
  82                         .override = 0,
  83                         .initialize = 0,
  84                         .check_required = 0,
  85                         .check_ambiguity = 0,
  86                         .print_errors = 1
  87                 };
  88                 if (filter_cmdline_parser_config_file(cf, &conf, &params))
  89                         return -E_FILTER_SYNTAX;
  90         }
  91         if (!conf.filter_given)
  92                 return -E_NO_FILTERS;
  93         return 1;
  94 }
  95
  96 /**
  97  * The main function of para_filter.
  98  *
  99  * Para_filter reads data from stdin, converts it by using a chain
 100  * of filters (specified on the command line) and writes the resulting
 101  * data to stdout.
 102  *
 103  * \param argc Number of command line options.
 104  * \param argv Vector of arguments.
 105  *
 106  * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
 107  */
 108 int main(int argc, char *argv[])
 109 {
 110         static struct sched s;
 111         int i, ret;
 112         struct filter *f;
 113         struct btr_node *parent;
 114         struct filter_node **fns;
 115
 116         filter_init();
 117         ret = parse_config(argc, argv);
 118         if (ret < 0)
 119                 goto out;
 120         sit->btrn = btr_new_node(&(struct btr_node_description)
 121                 EMBRACE(.name = "stdin"));
 122         stdin_set_defaults(sit);
 123         register_task(&sit->task);
 124
 125         fns = para_malloc(conf.filter_given * sizeof(*fns));
 126         for (i = 0, parent = sit->btrn; i < conf.filter_given; i++) {
 127                 char *fa = conf.filter_arg[i];
 128                 struct filter_node *fn;
 129
 130                 fn = fns[i] = para_calloc(sizeof(*fn));
 131                 ret = check_filter_arg(fa, &fn->conf);
 132                 if (ret < 0) {
 133                         free(fn);
 134                         goto out_cleanup;
 135                 }
 136                 fn->filter_num = ret;
 137                 f = filters + fn->filter_num;
 138                 sprintf(fn->task.status, "%s", f->name);
 139                 PARA_DEBUG_LOG("filter #%d: %s\n", i, f->name);
 140                 fn->btrn = btr_new_node(&(struct btr_node_description)
 141                         EMBRACE(.name = f->name, .parent = parent,
 142                         .handler = f->execute, .context = fn));
 143                 fn->task.pre_select = f->pre_select;
 144                 fn->task.post_select = f->post_select;
 145                 f->open(fn);
 146                 register_task(&fn->task);
 147                 parent = fn->btrn;
 148         }
 149         sot->btrn = btr_new_node(&(struct btr_node_description)
 150                 EMBRACE(.name = "stdout", .parent = parent));
 151         stdout_set_defaults(sot);
 152         register_task(&sot->task);
 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 out_cleanup:
 159         for (i--; i >= 0; i--) {
 160                 struct filter_node *fn = fns[i];
 161
 162                 f = filters + fn->filter_num;
 163                 if (f->close)
 164                         f->close(fn);
 165                 btr_free_node(fn->btrn);
 166                 free(fn->conf);
 167                 free(fn);
 168         }
 169         free(fns);
 170         btr_free_node(sit->btrn);
 171         btr_free_node(sot->btrn);
 172 out:
 173         if (ret < 0)
 174                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 175         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 176 }