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/*
* Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file filter.c the stand-alone filter program */
#include "para.h"
#include "filter.cmdline.h"
#include "list.h"
#include "sched.h"
#include "filter.h"
#include "string.h"
#include "stdin.h"
#include "stdout.h"
#include "error.h"
/** init the array of errors for para_filter */
INIT_FILTER_ERRLISTS;
/** the task that reads from stdin */
static struct stdin_task stdin_task_struct;
/** pointer to the stdin task */
static struct stdin_task *sit = &stdin_task_struct;
/** the task that filters the data */
static struct filter_chain filter_chain_struct;
/** pointer to the filter chain */
static struct filter_chain *fc = &filter_chain_struct;
/** the task that writes converted data to stdout */
static struct stdout_task stdout_task_struct;
/** pointer to the stdout task */
static struct stdout_task *sot = &stdout_task_struct;
/** gengetopt struct that holds the command line args */
static struct filter_args_info conf;
INIT_STDERR_LOGGING(conf.loglevel_arg);
static void filter_event_handler(struct task *t)
{
PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
unregister_task(t);
}
static void open_filters(void)
{
struct filter_node *fn;
list_for_each_entry(fn, &fc->filters, node) {
fn->filter->open(fn);
PARA_INFO_LOG("opened %s filter\n", fn->filter->name);
fc->outbuf = fn->buf;
fc->out_loaded = &fn->loaded;
}
}
static int init_filter_chain(void)
{
int i, filter_num;
struct filter_node *fn;
INIT_LIST_HEAD(&fc->filters);
fc->inbuf = sit->buf;
fc->in_loaded = &sit->loaded;
fc->input_eof = &sit->eof;
fc->eof = 0;
fc->output_eof = &sot->eof;
fc->task.private_data = fc;
fc->task.pre_select = filter_pre_select;
fc->task.event_handler = filter_event_handler;
sprintf(fc->task.status, "filter chain");
for (i = 0; i < conf.filter_given; i++) {
char *fa = conf.filter_arg[i];
fn = para_calloc(sizeof(struct filter_node));
filter_num = check_filter_arg(fa, &fn->conf);
if (filter_num < 0) {
free(fn);
return filter_num;
}
fn->fc = fc;
INIT_LIST_HEAD(&fn->callbacks);
fn->filter = &filters[filter_num];
PARA_DEBUG_LOG("adding %s to filter chain\n", fn->filter->name);
list_add_tail(&fn->node, &fc->filters);
}
if (list_empty(&fc->filters))
return -E_NO_FILTERS;
open_filters();
return 1;
}
static int parse_config(int argc, char *argv[])
{
static char *cf; /* config file */
struct stat statbuf;
int i;
if (filter_cmdline_parser(argc, argv, &conf))
return -E_FILTER_SYNTAX;
HANDLE_VERSION_FLAG("filter", conf);
if (!cf) {
char *home = para_homedir();
cf = make_message("%s/.paraslash/filter.conf", home);
free(home);
}
if (!stat(cf, &statbuf)) {
struct filter_cmdline_parser_params params = {
.override = 0,
.initialize = 0,
.check_required = 0,
.check_ambiguity = 0
};
if (filter_cmdline_parser_config_file(cf, &conf, ¶ms))
return -E_FILTER_SYNTAX;
}
if (!conf.list_filters_given)
return 1;
printf("available filters: ");
for (i = 0; filters[i].name; i++)
printf("%s%s%s", i? " " : "", filters[i].name,
filters[i].parse_config? "*": "");
printf("\nFilters marked with \"*\" have further command line options. Try\n"
"\tpara_filter -f '<filtername> -h'\nfor more information.\n");
exit(EXIT_SUCCESS);
}
/**
* para_filter's main function.
*
* para_filter reads data from stdin, converts it by using a chain
* of filters (specified on the command line) and writes the resulting
* data to stdout.
*
* \param argc number of command line options
* \param argv vector of arguments
*
* \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
*/
int main(int argc, char *argv[])
{
int ret;
struct sched s;
stdin_set_defaults(sit);
sit->buf = para_malloc(sit->bufsize),
filter_init(filters);
ret = parse_config(argc, argv);
if (ret < 0)
goto out;
ret = init_filter_chain();
if (ret < 0)
goto out;
stdout_set_defaults(sot);
sot->buf = fc->outbuf;
sot->loaded = fc->out_loaded;
sot->input_eof = &fc->eof;
register_task(&sit->task);
register_task(&fc->task);
register_task(&sot->task);
s.default_timeout.tv_sec = 1;
s.default_timeout.tv_usec = 0;
ret = sched(&s);
out:
free(sit->buf);
close_filters(fc);
if (ret < 0)
PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
}
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