fixed bug with freeze/UB caused by starting timestamp from 0. now use default delay in this case (quite rare). also experimented with bad timestamp( % 100 in get timestamp) - playable

config.h

@@ -4,6 +4,8 @@
 #define DEFAULT_WIDTH 600
 #define FPS 60
 
+#define DELTA_MS_DEFAULT 20
+
 // #define DBG
 
 #ifdef DBG

main.c

@@ -104,6 +104,9 @@ int main(int argc, char* args[]) {
 		}
 
 		int frameTime = getTimeStamp() - frameStartTime;
+		if (frameTime < 0) {
+			frameTime = DELTA_MS_DEFAULT;
+		}
 #define FRAME_TIME 20 //16
 		// dbg_printf("frameTime = %d\n", frameTime);
 		if (frameTime < FRAME_TIME) { // 1000ms/60frames = 16.(6)

misc.c

@@ -21,6 +21,6 @@ void intToStr(int num, int ndigits, char* result) {
 	}
 }
 
-int getTimeStamp() {
-	return _ksys_get_ns_count()/1000000;
+int getTimeStamp() { // in ms
+	return (_ksys_get_ns_count()/1000000);
 }

runner.c

@@ -84,6 +84,9 @@ void runnerOnKeyUp(int key) {
 	else if (runner.crashed) {
 		// Check that enough time has elapsed before allowing jump key to restart.
 		int deltaTime = getTimeStamp() - runner.time;
+		if (deltaTime < 0) {
+			deltaTime = DELTA_MS_DEFAULT;
+		}
 		//printf(".deltaTime = %d\n", deltaTime);
 		if (key == RUNNER_KEYCODE_RESTART || (deltaTime >= RUNNER_GAMEOVER_CLEAR_TIME && (key == RUNNER_KEYCODE_JUMP_1 || key == RUNNER_KEYCODE_JUMP_2))) {
 			runnerRestart();
@@ -101,12 +104,15 @@ void runnerClearCanvas() {
 }
 
 void runnerUpdate() {
-	//printf("runnerUpdate() runner.playing = %d\n", runner.playing);
+	//dbg_printf("runnerUpdate() runner.playing = %d\n", runner.playing);
 	//runner.updatePending = false;
 	int now = getTimeStamp();
 	//printf("now = %d\n", now);
 	int deltaTime = now - (runner.time ? runner.time : 0);
-	//printf("runnerUpdate() deltaTime = %d\n", deltaTime);
+	if (deltaTime < 0) {
+		deltaTime = DELTA_MS_DEFAULT;
+	}
+	// dbg_printf("runnerUpdate() deltaTime = %d\n", deltaTime);
 	runner.time = now;
 	if (runner.playing) {
 		//printf("runnerUpdate() %d\n", getTimeStamp());

trex.c

@@ -127,6 +127,9 @@ void trexSetBlinkDelay() {
 void trexBlink(int time) {
 	//printf("trexBlink(%d)\n", time);
 	int deltaTime = time - trex.animStartTime;
+	if (deltaTime < 0) {
+		deltaTime = DELTA_MS_DEFAULT;
+	}
 	if (deltaTime >= trex.blinkDelay) {
 		trexDraw(trex.currentAnimFrames.frames[trex.currentFrame], 0);
 		if (trex.currentFrame == 1) {