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
  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(int argc, char *argv[])
  64 {
  65         static char *cf; /* config file */
  66         struct stat statbuf;
  67
  68         if (filter_cmdline_parser(argc, argv, &conf))
  69                 return -E_FILTER_SYNTAX;
  70         HANDLE_VERSION_FLAG("filter", conf);
  71         if (conf.help_given || conf.detailed_help_given)
  72                 print_help_and_die();
  73         loglevel = get_loglevel_by_name(conf.loglevel_arg);
  74         if (!cf) {
  75                 char *home = para_homedir();
  76                 cf = make_message("%s/.paraslash/filter.conf", home);
  77                 free(home);
  78         }
  79         if (!stat(cf, &statbuf)) {
  80                 struct filter_cmdline_parser_params params = {
  81                         .override = 0,
  82                         .initialize = 0,
  83                         .check_required = 0,
  84                         .check_ambiguity = 0,
  85                         .print_errors = 1
  86                 };
  87                 if (filter_cmdline_parser_config_file(cf, &conf, &params))
  88                         return -E_FILTER_SYNTAX;
  89         }
  90         if (!conf.filter_given)
  91                 return -E_NO_FILTERS;
  92         return 1;
  93 }
  94
  95 /**
  96  * The main function of para_filter.
  97  *
  98  * Para_filter reads data from stdin, converts it by using a chain
  99  * of filters (specified on the command line) and writes the resulting
 100  * data to stdout.
 101  *
 102  * \param argc Number of command line options.
 103  * \param argv Vector of arguments.
 104  *
 105  * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
 106  */
 107 int main(int argc, char *argv[])
 108 {
 109         static struct sched s;
 110         int i, ret;
 111         struct filter *f;
 112         struct btr_node *parent;
 113         struct filter_node **fns;
 114
 115         filter_init();
 116         ret = parse_config(argc, argv);
 117         if (ret < 0)
 118                 goto out;
 119         sit->btrn = btr_new_node(&(struct btr_node_description)
 120                 EMBRACE(.name = "stdin"));
 121         stdin_set_defaults(sit);
 122         register_task(&sit->task);
 123
 124         fns = para_malloc(conf.filter_given * sizeof(*fns));
 125         for (i = 0, parent = sit->btrn; i < conf.filter_given; i++) {
 126                 char *fa = conf.filter_arg[i];
 127                 struct filter_node *fn;
 128
 129                 fn = fns[i] = para_calloc(sizeof(*fn));
 130                 ret = check_filter_arg(fa, &fn->conf);
 131                 if (ret < 0) {
 132                         free(fn);
 133                         goto out_cleanup;
 134                 }
 135                 fn->filter_num = ret;
 136                 f = filters + fn->filter_num;
 137                 sprintf(fn->task.status, "%s", f->name);
 138                 PARA_DEBUG_LOG("filter #%d: %s\n", i, f->name);
 139                 fn->btrn = btr_new_node(&(struct btr_node_description)
 140                         EMBRACE(.name = f->name, .parent = parent,
 141                         .handler = f->execute, .context = fn));
 142                 fn->task.pre_select = f->pre_select;
 143                 fn->task.post_select = f->post_select;
 144                 f->open(fn);
 145                 register_task(&fn->task);
 146                 parent = fn->btrn;
 147         }
 148         sot->btrn = btr_new_node(&(struct btr_node_description)
 149                 EMBRACE(.name = "stdout", .parent = parent));
 150         stdout_set_defaults(sot);
 151         register_task(&sot->task);
 152
 153         s.default_timeout.tv_sec = 1;
 154         s.default_timeout.tv_usec = 0;
 155         btr_log_tree(sit->btrn, LL_INFO);
 156         ret = schedule(&s);
 157 out_cleanup:
 158         for (i--; i >= 0; i--) {
 159                 struct filter_node *fn = fns[i];
 160
 161                 f = filters + fn->filter_num;
 162                 if (f->close)
 163                         f->close(fn);
 164                 btr_free_node(fn->btrn);
 165                 free(fn->conf);
 166                 free(fn);
 167         }
 168         free(fns);
 169         btr_free_node(sit->btrn);
 170         btr_free_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 }