filter.c

   1 /*
   2  * Copyright (C) 2005-2013 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 "buffer_tree.h"
  17 #include "filter.h"
  18 #include "string.h"
  19 #include "stdin.h"
  20 #include "stdout.h"
  21 #include "error.h"
  22 #include "version.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(void)
  64 {
  65         static char *cf; /* config file */
  66         struct stat statbuf;
  67
  68         HANDLE_VERSION_FLAG("filter", conf);
  69         if (conf.help_given || conf.detailed_help_given)
  70                 print_help_and_die();
  71         if (!cf) {
  72                 char *home = para_homedir();
  73                 cf = make_message("%s/.paraslash/filter.conf", home);
  74                 free(home);
  75         }
  76         if (!stat(cf, &statbuf)) {
  77                 struct filter_cmdline_parser_params params = {
  78                         .override = 0,
  79                         .initialize = 0,
  80                         .check_required = 0,
  81                         .check_ambiguity = 0,
  82                         .print_errors = 1
  83                 };
  84                 filter_cmdline_parser_config_file(cf, &conf, &params);
  85                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
  86         }
  87         if (!conf.filter_given)
  88                 return -E_NO_FILTERS;
  89         return 1;
  90 }
  91
  92 /**
  93  * The main function of para_filter.
  94  *
  95  * Para_filter reads data from stdin, converts it by using a chain
  96  * of filters (specified on the command line) and writes the resulting
  97  * data to stdout.
  98  *
  99  * \param argc Number of command line options.
 100  * \param argv Vector of arguments.
 101  *
 102  * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
 103  */
 104 int main(int argc, char *argv[])
 105 {
 106         static struct sched s;
 107         int i, ret;
 108         struct filter *f;
 109         struct btr_node *parent;
 110         struct filter_node **fns;
 111
 112         filter_cmdline_parser(argc, argv, &conf); /* aborts on errors */
 113         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 114         filter_init();
 115         ret = parse_config();
 116         if (ret < 0)
 117                 goto out;
 118         sit->btrn = btr_new_node(&(struct btr_node_description)
 119                 EMBRACE(.name = "stdin"));
 120         stdin_set_defaults(sit);
 121         register_task(&s, &sit->task);
 122
 123         fns = para_malloc(conf.filter_given * sizeof(*fns));
 124         for (i = 0, parent = sit->btrn; i < conf.filter_given; i++) {
 125                 char *fa = conf.filter_arg[i];
 126                 struct filter_node *fn;
 127
 128                 fn = fns[i] = para_calloc(sizeof(*fn));
 129                 ret = check_filter_arg(fa, &fn->conf);
 130                 if (ret < 0) {
 131                         free(fn);
 132                         goto out_cleanup;
 133                 }
 134                 fn->filter_num = ret;
 135                 f = filters + fn->filter_num;
 136                 sprintf(fn->task.status, "%s", f->name);
 137                 PARA_DEBUG_LOG("filter #%d: %s\n", i, f->name);
 138                 fn->btrn = btr_new_node(&(struct btr_node_description)
 139                         EMBRACE(.name = f->name, .parent = parent,
 140                         .handler = f->execute, .context = fn));
 141                 fn->task.pre_select = f->pre_select;
 142                 fn->task.post_select = f->post_select;
 143                 f->open(fn);
 144                 register_task(&s, &fn->task);
 145                 parent = fn->btrn;
 146         }
 147         sot->btrn = btr_new_node(&(struct btr_node_description)
 148                 EMBRACE(.name = "stdout", .parent = parent));
 149         stdout_set_defaults(sot);
 150         register_task(&s, &sot->task);
 151
 152         s.default_timeout.tv_sec = 1;
 153         s.default_timeout.tv_usec = 0;
 154         btr_log_tree(sit->btrn, LL_INFO);
 155         ret = schedule(&s);
 156 out_cleanup:
 157         for (i--; i >= 0; i--) {
 158                 struct filter_node *fn = fns[i];
 159
 160                 f = filters + fn->filter_num;
 161                 if (f->close)
 162                         f->close(fn);
 163                 btr_remove_node(&fn->btrn);
 164                 if (f->free_config)
 165                         f->free_config(fn->conf);
 166                 free(fn);
 167         }
 168         free(fns);
 169         btr_remove_node(&sit->btrn);
 170         btr_remove_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 }