Clear tape status from status line after timeout

If tape is inactive (counter is not changing) for more than fifteen
seconds clear the tape status from the status line. Also adjust
percentage rounding so 100% is displayed when load is complete.

Author: ejaquay

Cassette.cpp

@@ -41,6 +41,7 @@ static unsigned int TempIndex=0;
 static unsigned int TapeRate=CAS_TAPEAUDIORATE;
 static unsigned int TapeSampleSize=0;
 static unsigned int MotorOffDelay = 0;
+static unsigned long PrvOffset=0,StalledCtr=0;
 
 unsigned char One[21]={0xC8,0xE8,0xE8,0xF8,0xF8,0xE8,0xC8,0xA8,0x78,0x50,0x50,0x30,0x10,0x00,0x00,0x10,0x30,0x30,0x50,0x80,0xA8};
 unsigned char Zero[40]={0xC8,0xD8,0xE8,0xE8,0xF0,0xF8,0xF8,0xF8,0xF0,0xE8,0xD8,0xC8,0xB8,0xA8,0x90,0x78,0x78,0x68,0x50,0x40,0x30,0x20,0x10,0x08,0x00,0x00,0x00,0x08,0x10,0x10,0x20,0x30,0x40,0x50,0x68,0x68,0x80,0x90,0xA8,0xB8};
@@ -210,8 +211,14 @@ void SetTapeCounter(unsigned int Count, bool forced)
 
 void UpdateTapeStatus(char* status, int max)
 {
-	if (TotalSize > 0)
-		snprintf(status, max, " | Tape:%05d (%d%%)", TapeOffset, TapeOffset * 100 / TotalSize);
+	if (PrvOffset != TapeOffset) {
+		StalledCtr = 0;
+		PrvOffset = TapeOffset;
+	} else {
+		StalledCtr++;
+	}
+	if (TotalSize > 0 && StalledCtr < 1000)
+		snprintf(status, max, " | Tape:%05d (%d%%)", TapeOffset, (TapeOffset + 50) * 100 / TotalSize);
 }
 
 void SetTapeMode(unsigned char Mode)	//Handles button pressed from Dialog