Re: [LI] Help: C code ...

[Babu Kalakrishnan <kalakrishnan@xxxxxxxx>]

Hi,

>> [3] How do I get input from the kbd; getchar() echoes the char 
>> to the terminal (Something I don't want) and with extended keys, it looks 
>> ugly (^[[[A for F1 for example). 
>> >> getpasswdchar(), else curses supports non-echoeing input.
>If I am not wrong there should be some IOCTL call or whatever to disable 
>echoing.

To get unechoed & unbuffered characters without using the curses library,
you could use the termios functions:

#include <termios.h>
#include <unistd.h>

struct termios attrib; // A place to store the current terminal attributes
int fd;		         

fd = fileno(stdin);	// Get integer descriptor for stream stdin 
if (isatty(fd))		// if stdin is not a tty -(redirected I/O), you might want
to skip this
{
	tcgetattr(fd,&attrib);	// Save current attributes for terminal
	attrib.c_lflag &= ~(ECHO+ICANON);		// Turn off echo & buffering
		// Alternately you can use the cfmakeraw() function to set the tty to raw
mode
		// But this is not required if you just want unbuffered&unechoed chars
	tcsetattr(fd,TCSANOW,&attrib);			// Set the new attributes
	// Do your stuff here ....getchar() will now return immediately with a
character without 	// echo. You'll need to handle Backspace, newline,Del
etc by yourselves

	
	//Restore old attributes when done
	attrib |= ECHO+ICANON;
	tcsetattr(fd,TCSANOW,&attrib);
}
	
Check the man page termios(3) for more details.

Kala	
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