--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/logging.c	Fri Feb 14 16:58:19 2014 +0100
@@ -0,0 +1,53 @@
+#include <ansi_c.h>
+
+#include "logging.h"
+
+/* this refers to the event time defined as a global variable in the main program */
+extern double utc;
+
+
+int __logger_init(struct logger *l)
+{
+	int panel = LoadPanel(0, "FXAnalyse.uir", LOGGING);
+	if (panel < 0)
+		return -1;
+	l->panel = panel;
+	return 0;
+}
+
+
+void __logmessage(struct logger *l, enum loglevel level, const char *frmt, ...)
+{
+	static const char levels[][16] = {
+		"DEBUG",
+		"INFO",
+		"WARNING",
+		"ERROR",
+	};
+
+	char msg[1024];
+	int len = 0;
+	
+	// timestamp
+	len += sprintf(msg, "%014.3f ", utc);
+	time_t now = time(NULL);
+	struct tm *t = localtime(&now);
+	len += strftime(msg + len, sizeof(msg) - len, "%d-%m-%Y %H:%M:%S ", t);
+	
+	// level
+	len += snprintf(msg + len, sizeof(msg) - len, "%s: ", levels[level]);
+	
+	// message
+	va_list args;
+	va_start(args, frmt);
+	len += vsnprintf(msg + len, sizeof(msg) - len, frmt, args);
+	va_end(args);
+	
+	// add newline
+	len = MIN(len, sizeof(msg) - 2);
+	msg[len] = '\n';
+	msg[len + 1] = '\0';
+	
+	// display message
+	SetCtrlVal(l->panel, LOGGING_LOGGING, msg);
+}