2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
18 /** \file filter.c the stand-alone filter program */
22 #include "filter.cmdline.h"
31 /** init the array of errors for para_filter */
34 /** the task that reads from stdin */
35 static struct stdin_task stdin_task_struct
;
36 /** pointer to the stdin task */
37 static struct stdin_task
*sit
= &stdin_task_struct
;
39 /** the task that filters the data */
40 static struct filter_chain filter_chain_struct
;
41 /** pointer to the filter chain */
42 static struct filter_chain
*fc
= &filter_chain_struct
;
44 /** the task that writes converted data to stdout */
45 static struct stdout_task stdout_task_struct
;
46 /** pointer to the stdout task */
47 static struct stdout_task
*sot
= &stdout_task_struct
;
49 /** gengetopt struct that holds the command line args */
50 static struct filter_args_info conf
;
52 INIT_STDERR_LOGGING(conf
.loglevel_arg
);
54 static void filter_event_handler(struct task
*t
)
56 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t
->ret
));
60 static void open_filters(void)
62 struct filter_node
*fn
;
64 list_for_each_entry(fn
, &fc
->filters
, node
) {
66 PARA_INFO_LOG("opened %s filter\n", fn
->filter
->name
);
68 fc
->out_loaded
= &fn
->loaded
;
72 static int init_filter_chain(void)
75 struct filter_node
*fn
;
77 INIT_LIST_HEAD(&fc
->filters
);
80 fc
->in_loaded
= &sit
->loaded
;
81 fc
->input_eof
= &sit
->eof
;
83 fc
->output_eof
= &sot
->eof
;
84 fc
->task
.private_data
= fc
;
85 fc
->task
.pre_select
= filter_pre_select
;
86 fc
->task
.event_handler
= filter_event_handler
;
87 sprintf(fc
->task
.status
, "filter chain");
89 for (i
= 0; i
< conf
.filter_given
; i
++) {
90 char *fa
= conf
.filter_arg
[i
];
91 fn
= para_calloc(sizeof(struct filter_node
));
92 filter_num
= check_filter_arg(fa
, &fn
->conf
);
98 INIT_LIST_HEAD(&fn
->callbacks
);
99 fn
->filter
= &filters
[filter_num
];
100 PARA_DEBUG_LOG("adding %s to filter chain\n", fn
->filter
->name
);
101 list_add_tail(&fn
->node
, &fc
->filters
);
103 if (list_empty(&fc
->filters
))
104 return -E_NO_FILTERS
;
109 static int parse_config(int argc
, char *argv
[])
111 static char *cf
; /* config file */
115 if (filter_cmdline_parser(argc
, argv
, &conf
))
116 return -E_FILTER_SYNTAX
;
117 HANDLE_VERSION_FLAG("filter", conf
);
119 char *home
= para_homedir();
120 cf
= make_message("%s/.paraslash/filter.conf", home
);
123 if (!stat(cf
, &statbuf
)) {
124 if (filter_cmdline_parser_configfile(cf
, &conf
, 0, 0, 0))
125 return -E_FILTER_SYNTAX
;
127 if (!conf
.list_filters_given
)
129 printf("available filters: ");
130 for (i
= 0; filters
[i
].name
; i
++)
131 printf("%s%s%s", i
? " " : "", filters
[i
].name
,
132 filters
[i
].parse_config
? "*": "");
133 printf("\nFilters marked with \"*\" have further command line options. Try\n"
134 "\tpara_filter -f '<filtername> -h'\nfor more information.\n");
139 * para_filter's main function.
141 * para_filter reads data from stdin, converts it by using a chain
142 * of filters (specified on the command line) and writes the resulting
145 * \param argc number of command line options
146 * \param argv vector of arguments
148 * \return \a EXIT_SUCCESS on success, EXIT_FAILURE on errors.
150 int main(int argc
, char *argv
[])
155 stdin_set_defaults(sit
);
156 sit
->buf
= para_malloc(sit
->bufsize
),
158 filter_init(filters
);
159 ret
= parse_config(argc
, argv
);
162 ret
= init_filter_chain();
166 stdout_set_defaults(sot
);
167 sot
->buf
= fc
->outbuf
;
168 sot
->loaded
= fc
->out_loaded
;
169 sot
->input_eof
= &fc
->eof
;
171 register_task(&sit
->task
);
172 register_task(&fc
->task
);
173 register_task(&sot
->task
);
174 s
.default_timeout
.tv_sec
= 1;
175 s
.default_timeout
.tv_usec
= 0;
181 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret
));
182 return ret
< 0? EXIT_FAILURE
: EXIT_SUCCESS
;