C51: GETCHAR Echoes Characters

Information in this article applies to:

• C51 Version 5.x
• C51 Version 6.x

QUESTION

I just discovered that the getchar function in the library echoes characters received.

Is there a getchar that I can use that will not echo characters?

ANSWER

Yes. The default getchar is implemented similar to the following:

char getchar (void)
{
char c;

c = _getkey ();
putchar (c);
return (c);
}

Note that this simple implementation does not account for the ungetchar function.

The following replacement for getchar will return received characters without echoing them:

char getchar (void)
{
return (_getkey ());
}

Again, note that this implementation does not account for the ungetchar function. If you use ungetchar, you must also include that functionality in your implementation of getchar.

SEE ALSO

• C51: 8051 Serial I/O in C

Last Reviewed: Thursday, February 25, 2021