Write timestamps to the logfile.

src/utils.c

@@ -1,22 +1,52 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
 
 static FILE* g_logfile = NULL;
 
+static unsigned char g_lastchar = '\n';
+
+#ifdef _WIN32
+	#include <windows.h>
+	static unsigned long g_timestamp;
+#else
+	#include <sys/time.h>
+	static struct timeval g_timestamp;
+#endif
+
 int message (const char* fmt, ...)
 {
 	va_list ap;
-	
+
 	if (g_logfile) {
+		if (g_lastchar == '\n') {
+#ifdef _WIN32
+			unsigned long timestamp = GetTickCount () - g_timestamp;
+			unsigned long sec = timestamp / 1000L, msec = timestamp % 1000L;
+			fprintf (g_logfile, "[%li.%03li] ", sec, msec);
+#else
+			struct timeval now = {0}, timestamp = {0};
+			gettimeofday (&now, NULL);
+			timersub (&now, &g_timestamp, &timestamp);
+			fprintf (g_logfile, "[%lli.%06lli] ", (long long)timestamp.tv_sec, (long long)timestamp.tv_usec);
+#endif
+		}
+
+		size_t len = strlen (fmt);
+		if (len > 0)
+			g_lastchar = fmt[len - 1];
+		else
+			g_lastchar = 0;
+
 		va_start (ap, fmt);
 		vfprintf (g_logfile, fmt, ap);
 		va_end (ap);
 	}
-	
+
 	va_start (ap, fmt);
 	int rc = vfprintf (stdout, fmt, ap);
 	va_end (ap);
-	
+
 	return rc;
 }
 
@@ -26,7 +56,16 @@ void message_set_logfile (const char* filename)
 		fclose (g_logfile);
 		g_logfile = NULL;
 	}
-		
+
 	if (filename)
 		g_logfile = fopen (filename, "w");
+
+	if (g_logfile) {
+		g_lastchar = '\n';
+#ifdef _WIN32
+		g_timestamp = GetTickCount ();
+#else
+		gettimeofday (&g_timestamp, NULL);
+#endif
+	}
 }