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/*
Provides a log file to ease tracing the program.
Copyright (C) 2006-2025
Free Software Foundation, Inc.
Written by:
Roland Illig <roland.illig@gmx.de>, 2006
Slava Zanko <slavazanko@gmail.com>, 2009, 2011
This file is part of the Midnight Commander.
The Midnight Commander 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 3 of the License,
or (at your option) any later version.
The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
*/
/** \file logging.c
* \brief Source: provides a log file to ease tracing the program
*/
#include <config.h>
#include <stdarg.h>
#include <stdio.h>
#include "lib/global.h"
#include "lib/mcconfig.h"
#include "lib/fileloc.h"
#include "logging.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
#define CONFIG_GROUP_NAME "Development"
#define CONFIG_KEY_NAME "logging"
#define CONFIG_KEY_NAME_FILE "logfile"
/*** file scope type declarations ****************************************************************/
/*** forward declarations (file scope functions) *************************************************/
/*** file scope variables ************************************************************************/
static gboolean logging_initialized = FALSE;
static gboolean logging_enabled = FALSE;
/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
static gboolean
is_logging_enabled_from_env (void)
{
const char *env_is_enabled;
env_is_enabled = g_getenv ("MC_LOG_ENABLE");
if (env_is_enabled == NULL)
return FALSE;
logging_enabled = (*env_is_enabled == '1' || g_ascii_strcasecmp (env_is_enabled, "true") == 0);
logging_initialized = TRUE;
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
static gboolean
is_logging_enabled (void)
{
if (logging_initialized)
return logging_enabled;
if (is_logging_enabled_from_env ())
return logging_enabled;
logging_enabled =
mc_config_get_bool (mc_global.main_config, CONFIG_GROUP_NAME, CONFIG_KEY_NAME, FALSE);
logging_initialized = TRUE;
return logging_enabled;
}
/* --------------------------------------------------------------------------------------------- */
static char *
get_log_filename (void)
{
const char *env_filename;
env_filename = g_getenv ("MC_LOG_FILE");
if (env_filename != NULL)
return g_strdup (env_filename);
if (mc_config_has_param (mc_global.main_config, CONFIG_GROUP_NAME, CONFIG_KEY_NAME_FILE))
return mc_config_get_string (mc_global.main_config, CONFIG_GROUP_NAME, CONFIG_KEY_NAME_FILE,
NULL);
return mc_config_get_full_path ("mc.log");
}
/* --------------------------------------------------------------------------------------------- */
static void
G_GNUC_PRINTF (1, 0)
mc_va_log (const char *fmt, va_list args)
{
char *logfilename;
logfilename = get_log_filename ();
if (logfilename != NULL)
{
FILE *f;
f = fopen (logfilename, "a");
if (f != NULL)
{
(void) vfprintf (f, fmt, args);
(void) fclose (f);
}
g_free (logfilename);
}
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
void
mc_log (const char *fmt, ...)
{
va_list args;
if (!is_logging_enabled ())
return;
va_start (args, fmt);
mc_va_log (fmt, args);
va_end (args);
}
/* --------------------------------------------------------------------------------------------- */
void
mc_always_log (const char *fmt, ...)
{
va_list args;
va_start (args, fmt);
mc_va_log (fmt, args);
va_end (args);
}
/* --------------------------------------------------------------------------------------------- */
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