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tio/src/configfile.c
Martin Lund b72fae4c87 Cleanup
2022-07-03 18:28:51 +02:00

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/*
* tio - a simple serial terminal I/O tool
*
* Copyright (c) 2020-2022 Liam Beguin
* Copyright (c) 2022 Martin Lund
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#define _GNU_SOURCE
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <errno.h>
#include <getopt.h>
#include <termios.h>
#include <limits.h>
#include <unistd.h>
#include <regex.h>
#include <ini.h>
#include "options.h"
#include "configfile.h"
#include "misc.h"
#include "options.h"
#include "error.h"
#include "print.h"
static struct config_t *c;
static int get_match(const char *input, const char *pattern, char **match)
{
int ret;
int len = 0;
regex_t re;
regmatch_t m[2];
char err[128];
/* compile a regex with the pattern */
ret = regcomp(&re, pattern, REG_EXTENDED);
if (ret)
{
regerror(ret, &re, err, sizeof(err));
fprintf(stderr, "regex error: %s", err);
return ret;
}
/* try to match on input */
ret = regexec(&re, input, 2, m, 0);
if (!ret)
{
len = m[1].rm_eo - m[1].rm_so;
}
regfree(&re);
if (len)
{
asprintf(match, "%s", &input[m[1].rm_so]);
}
return len;
}
/**
* data_handler() - walk config file to load parameters matching user input
*
* INIH handler used to get all parameters from a given section
*/
static int data_handler(void *user, const char *section, const char *name,
const char *value)
{
UNUSED(user);
// If section matches current section being parsed
if (!strcmp(section, c->section_name))
{
// Set configuration parameter if found
if (!strcmp(name, "tty"))
{
asprintf(&c->tty, value, c->match);
option.tty_device = c->tty;
}
else if (!strcmp(name, "baudrate"))
{
option.baudrate = string_to_long((char *)value);
}
else if (!strcmp(name, "databits"))
{
option.databits = atoi(value);
}
else if (!strcmp(name, "flow"))
{
asprintf(&c->flow, "%s", value);
option.flow = c->flow;
}
else if (!strcmp(name, "stopbits"))
{
option.stopbits = atoi(value);
}
else if (!strcmp(name, "parity"))
{
asprintf(&c->parity, "%s", value);
option.parity = c->parity;
}
else if (!strcmp(name, "output-delay"))
{
option.output_delay = atoi(value);
}
else if (!strcmp(name, "no-autoconnect"))
{
if (!strcmp(value, "enable"))
{
option.no_autoconnect = true;
}
else if (!strcmp(value, "disable"))
{
option.no_autoconnect = false;
}
}
else if (!strcmp(name, "log"))
{
if (!strcmp(value, "enable"))
{
option.log = true;
}
else if (!strcmp(value, "disable"))
{
option.log = false;
}
}
else if (!strcmp(name, "log-file"))
{
asprintf(&c->log_filename, "%s", value);
option.log_filename = c->log_filename;
}
else if (!strcmp(name, "log-strip"))
{
if (!strcmp(value, "enable"))
{
option.log_strip = true;
}
else if (!strcmp(value, "disable"))
{
option.log_strip = false;
}
}
else if (!strcmp(name, "local-echo"))
{
if (!strcmp(value, "enable"))
{
option.local_echo = true;
}
else if (!strcmp(value, "disable"))
{
option.local_echo = false;
}
}
else if (!strcmp(name, "hexadecimal"))
{
if (!strcmp(value, "enable"))
{
option.hex_mode = true;
}
else if (!strcmp(value, "disable"))
{
option.hex_mode = false;
}
}
else if (!strcmp(name, "timestamp"))
{
if (!strcmp(value, "enable"))
{
option.timestamp = TIMESTAMP_24HOUR;
}
else if (!strcmp(value, "disable"))
{
option.timestamp = TIMESTAMP_NONE;
}
}
else if (!strcmp(name, "timestamp-format"))
{
option.timestamp = timestamp_option_parse(value);
}
else if (!strcmp(name, "map"))
{
asprintf(&c->map, "%s", value);
option.map = c->map;
}
else if (!strcmp(name, "color"))
{
if (!strcmp(value, "list"))
{
// Ignore
return 0;
}
if (!strcmp(value, "none"))
{
option.color = -1; // No color
return 0;
}
option.color = atoi(value);
if ((option.color < 0) || (option.color > 255))
{
option.color = -1; // No color
}
}
else if (!strcmp(name, "socket"))
{
asprintf(&c->socket, "%s", value);
option.socket = c->socket;
}
}
return 0;
}
/**
* section_pattern_search_handler() - walk config file to find section matching user input
*
* INIH handler used to resolve the section matching the user's input.
* This will look for the pattern element of each section and try to match it
* with the user input.
*/
static int section_pattern_search_handler(void *user, const char *section, const char *varname,
const char *varval)
{
UNUSED(user);
if (strcmp(varname, "pattern"))
return 0;
if (!strcmp(varval, c->user))
{
/* pattern matches as plain text */
asprintf(&c->section_name, "%s", section);
}
else if (get_match(c->user, varval, &c->match) > 0)
{
/* pattern matches as regex */
asprintf(&c->section_name, "%s", section);
}
return 0;
}
/**
* section_pattern_search_handler() - walk config file to find section matching user input
*
* INIH handler used to resolve the section matching the user's input.
* This will try to match the user input against a section with the name of the user input.
*/
static int section_name_search_handler(void *user, const char *section, const char *varname,
const char *varval)
{
UNUSED(user);
UNUSED(varname);
UNUSED(varval);
if (!strcmp(section, c->user))
{
/* section name matches as plain text */
asprintf(&c->section_name, "%s", section);
}
return 0;
}
static int resolve_config_file(void)
{
asprintf(&c->path, "%s/tio/tiorc", getenv("XDG_CONFIG_HOME"));
if (!access(c->path, F_OK))
{
return 0;
}
free(c->path);
asprintf(&c->path, "%s/.config/tio/tiorc", getenv("HOME"));
if (!access(c->path, F_OK))
{
return 0;
}
free(c->path);
asprintf(&c->path, "%s/.tiorc", getenv("HOME"));
if (!access(c->path, F_OK))
{
return 0;
}
free(c->path);
c->path = NULL;
return -EINVAL;
}
void config_file_parse(void)
{
int ret;
c = malloc(sizeof(struct config_t));
memset(c, 0, sizeof(struct config_t));
// Find config file
if (resolve_config_file() != 0)
{
// None found - stop parsing
return;
}
// Set user input which may be tty device or sub config
c->user = option.tty_device;
if (!c->user)
{
return;
}
// Parse default (unnamed) settings
asprintf(&c->section_name, "%s", "");
ret = ini_parse(c->path, data_handler, NULL);
if (ret < 0)
{
fprintf(stderr, "Error: Unable to parse configuration file (%d)", ret);
exit(EXIT_FAILURE);
}
free(c->section_name);
c->section_name = NULL;
// Find matching section
ret = ini_parse(c->path, section_pattern_search_handler, NULL);
if (!c->section_name)
{
ret = ini_parse(c->path, section_name_search_handler, NULL);
if (!c->section_name)
{
debug_printf("Unable to match user input to configuration section (%d)", ret);
return;
}
}
// Parse settings of found section (sub config)
ret = ini_parse(c->path, data_handler, NULL);
if (ret < 0)
{
fprintf(stderr, "Error: Unable to parse configuration file (%d)", ret);
exit(EXIT_FAILURE);
}
atexit(&config_exit);
}
void config_exit(void)
{
free(c->tty);
free(c->flow);
free(c->parity);
free(c->log_filename);
free(c->map);
free(c->match);
free(c->section_name);
free(c->path);
free(c);
}
void config_file_print(void)
{
if (c->path != NULL)
{
tio_printf(" Path: %s", c->path);
if (c->section_name != NULL)
{
tio_printf(" Active sub-configuration: %s", c->section_name);
}
}
}
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