[En-Nut-Discussion] How to write character filter with timeout?

[Ulrich Prinz]

Hi!

I need to wait for a specific character on a USART and there must be a 
timeout available. To simply wait for a character isn't a problem as one 
can set
_ioctl(_fileno(dev), UART_SETREADTIMEOUT, &t);

In my case lots of characters can come in and I have to wait on that 
specific one... So I have to read every character until I found 'the 
one' or time is over.

Is there a non-blocking function for fgetc() or do I have to do stream 
parsing or is there any easier way?

Best regards,
Ulrich