common: Logging rework

Use common logging macros for a consistent output. A logging domain
needs to be set in a Makefile first (the _LOG_DOMAIN define).

Heavy debugging output is guarded by the __DEBUG_INTERNAL define
and omitted by default.

Logging severity is controlled by the TUXCMD_DEBUG env. var,
typically set by the tuxcmd process itself.

1 files changed, 55 insertions, 0 deletions

diff --git a/common/logutils.h b/common/logutils.h
new file mode 100644
index 0000000..2e67f04
--- /dev/null
+++ b/common/logutils.h
@@ -0,0 +1,55 @@
+/*  Tux Commander VFS: Logging utilities
+ *  Copyright (C) 2023-2024 Tomas Bzatek <tbzatek@users.sourceforge.net>
+ *   Check for updates on tuxcmd.sourceforge.net
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LOGUTILS_H__
+#define __LOGUTILS_H__
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+#include <stdio.h>
+#include <syslog.h>
+
+
+extern int _log_level;
+
+#define _log(severity, prefix, format, ...) { \
+  if (_log_level >= severity) \
+    fprintf (stdout, "  " prefix " " format "\n", ##__VA_ARGS__); \
+}
+
+#define log_error(format, msg...)   _log (LOG_ERR,     "(EE::" G_STRINGIFY (_LOG_DOMAIN) ")", format, ##msg)
+#define log_warn(format, msg...)    _log (LOG_WARNING, "(WW::" G_STRINGIFY (_LOG_DOMAIN) ")", format, ##msg)
+#define log_notice(format, msg...)  _log (LOG_NOTICE,  "(II::" G_STRINGIFY (_LOG_DOMAIN) ")", format, ##msg)
+#define log_info(format, msg...)    _log (LOG_INFO,    "  (--)", format, ##msg)
+
+#ifdef __DEBUG_INTERNAL
+  #define log_debug(format, msg...) _log (LOG_DEBUG,   "      ", format, ##msg)
+#else
+  #define log_debug(format, msg...)  { }
+#endif
+
+void log_init (void);
+
+
+#ifdef __cplusplus
+  }
+#endif
+#endif /* __LOGUTILS_H__ */