Reading the Device Status Report ANSI escape sequence reply

Question

I\'m trying to retrieve the coordinates of cursor in a VT100 terminal using the following code:

void getCursor(int* x, int* y) {
  printf(\"\\033[6n\");
   s         


        

Answer 1

Your program is working but is waiting for an EOL character.

scanf is line oriented so it waits for a new line before processing. Try running your program and then hit the enter key.

The solution is to use something else that doesn't need a new line to read the input and then use sscanf to parse the values out.

You will also need to make stdin non-blocking or you won't get the input until the buffer is full or stdin is closed. See this question Making stdin non-blocking

You should also call fflush(stdout); after your printf to ensure it is actually written (printf is often line buffered so without a newline it may not flush the buffer).