Add timeval helper functions

timeval.c

@@ -0,0 +1,30 @@
+#include "timeval.h"
+#include <sys/time.h>
+
+void timeval_add( struct timeval* t1, struct timeval* t2, struct timeval* res )
+{
+	res->tv_sec = t1->tv_sec + t2->tv_sec;
+	res->tv_usec = t1->tv_usec + t2->tv_usec;
+	while( res->tv_usec > 1000000 ) {
+		res->tv_usec -= 1000000;
+		res->tv_sec += 1;
+	}
+}
+
+int timeval_compare( struct timeval* t1, struct timeval* t2 )
+{
+	if( t1->tv_sec < t2->tv_sec ) {
+		return -1;
+	} else if( t1->tv_sec > t2->tv_sec ) {
+		return 1;
+	}
+
+	if( t1->tv_usec < t2->tv_usec ) {
+		return -1;
+	} else if( t1->tv_usec > t2->tv_usec ) {
+		return 1;
+	}
+
+	return 0;
+}
+

timeval.h

@@ -0,0 +1,7 @@
+#pragma once
+
+struct timeval;
+
+void timeval_add( struct timeval* t1, struct timeval* t2, struct timeval* res );
+int timeval_compare( struct timeval* t1, struct timeval* t2 );
+