add logger

@@ -3,10 +3,11 @@ nobase_include_HEADERS = trbase.h \
 			 tr/commons.h \
 			 tr/interface.h \
 			 tr/memory.h \
+			 tr/logger.h \
 			 tr/tree_macros.h \
 			 tr/interface/class.h \
 			 tr/interface/indexable.h \
 			 tr/interface/observer.h \
 			 tr/interface/serializable.h \
-			 tr/interface/subject.h
-
+			 tr/interface/subject.h \
+			 tr/interface/logger.h

+/**
+ * \file
+ * The logger interface.
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2012  Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TR_INTERFACE_LOGGER_H__
+#define __TR_INTERFACE_LOGGER_H__
+
+#include <stdarg.h>
+
+#include "trbase.h"
+#include "tr/logger.h"
+
+typedef void (* fptr_TR_log)(void *, TR_logger_level, const char * const);
+
+TR_INTERFACE(TR_Logger) {
+	TR_IFID;
+	fptr_TR_log log;
+};
+
+extern void TR_loggerLog(void *, TR_logger_level, const char * const, ...);
+
+#endif // __TR_INTERFACE_LOGGER_H__
+
+// vim: set ts=4 sw=4:

+/**
+ * \file
+ * A generic logger class and two extended classes, One that logs to
+ * stderr and one that logs to the system syslog.
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2012  Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TR_LOGGER_H__
+#define __TR_LOGGER_H__
+
+#include "trbase.h"
+
+typedef enum {
+	TR_LOGGER_DEBUG=0,
+	TR_LOGGER_INFO,
+	TR_LOGGER_NOTICE,
+	TR_LOGGER_WARNING,
+	TR_LOGGER_ERR,
+	TR_LOGGER_CRIT,
+	TR_LOGGER_ALERT,
+	TR_LOGGER_EMERG
+} TR_logger_level;
+
+#include "tr/interface/logger.h"
+
+extern const char * const TR_logger_level_str[];
+
+TR_CLASS(TR_Logger) {
+	TR_logger_level min_level;
+};
+
+TR_CLASS(TR_LoggerStderr) {
+	TR_EXTENDS(TR_Logger);
+};
+
+TR_CLASS(TR_LoggerSyslog) {
+	TR_EXTENDS(TR_Logger);
+};
+
+#endif // __TR_LOGGER_H__
+
+// vim: set ts=4 sw=4:

@@ -5,11 +5,15 @@ AM_CFLAGS += -I../include/
 
 TR_CLASS = memory.c \
 	   interface.c \
+	   logger.c \
+	   stderr.c \
+	   syslog.c \
 	   i_class.c \
 	   i_subject.c \
 	   i_observer.c \
 	   i_indexable.c \
-	   i_serializable.c
+	   i_serializable.c \
+	   i_logger.c
 
 lib_LTLIBRARIES = libtrbase.la
 

+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2012  Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "tr/logger.h"
+#include "tr/interface/logger.h"
+#include "trbase.h"
+
+TR_CREATE_INTERFACE(TR_Logger, 1);
+
+void
+TR_loggerLog(
+		void *             _object,
+		TR_logger_level    level,
+		const char * const fmt,
+		...) {
+	TR_Logger object = _object;
+
+	if (level >= object->min_level) {
+		char    * msg      = NULL;
+		size_t    msg_size = 0;
+		va_list   params;
+
+		va_start(params, fmt);
+		msg_size = vsnprintf(NULL, msg_size, fmt, params);
+		va_end(params);
+
+		msg = TR_malloc(msg_size + 1);
+
+		va_start(params, fmt);
+		vsnprintf(msg, msg_size + 1, fmt, params);
+		va_end(params);
+
+		TR_CALL(_object, TR_Logger, log, level, msg);
+
+		TR_MEM_FREE(msg);
+	}
+}
+
+// vim: set ts=4 sw=4:

+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2012  Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+
+#include "trbase.h"
+#include "tr/logger.h"
+#include "tr/interface/logger.h"
+
+const
+char * const
+TR_logger_level_str[] = {
+	"DEBUG",
+	"INFO",
+	"NOTICE",
+	"WARNING",
+	"ERR",
+	"CRIT",
+	"ALERT",
+	"EMERG"
+};
+
+static
+int
+loggerCtor(void * _this, va_list * params)
+{
+	TR_Logger this = _this;
+	this->min_level = va_arg(*params, int);
+
+	return 0;
+}
+
+static void loggerDtor(void * _this) {}
+
+TR_INIT_IFACE(TR_Class, loggerCtor, loggerDtor, NULL);
+TR_CREATE_CLASS(TR_Logger, NULL, TR_IF(TR_Class));
+
+// vim: set ts=4 sw=4:

+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2012  Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+
+#include "trbase.h"
+#include "tr/logger.h"
+#include "tr/interface/logger.h"
+
+static
+void
+logStderr(void * this, TR_logger_level level, const char * const msg)
+{
+	fprintf(stderr, "[%s] %s\n", TR_logger_level_str[level], msg);
+}
+
+TR_INIT_IFACE(TR_Logger, logStderr);
+TR_CREATE_CLASS(TR_LoggerStderr, TR_Logger, TR_IF(TR_Logger));
+
+// vim: set ts=4 sw=4:

+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2012  Georg Hopp
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <syslog.h>
+
+#include "trbase.h"
+#include "tr/logger.h"
+#include "tr/interface/logger.h"
+
+static
+const
+int syslog_priority[] = {
+    LOG_USER | LOG_DEBUG,
+    LOG_USER | LOG_INFO,
+    LOG_USER | LOG_NOTICE,
+    LOG_USER | LOG_WARNING,
+    LOG_USER | LOG_ERR,
+    LOG_USER | LOG_CRIT,
+    LOG_USER | LOG_ALERT,
+    LOG_USER | LOG_EMERG
+};
+
+static
+void
+logSyslog(void * this, TR_logger_level level, const char * const msg)
+{
+    syslog(syslog_priority[level], "[%s] %s", TR_logger_level_str[level], msg);
+}
+
+TR_INIT_IFACE(TR_Logger, logSyslog);
+TR_CREATE_CLASS(TR_LoggerSyslog, TR_Logger, TR_IF(TR_Logger));
+
+// vim: set ts=4 sw=4: