/*
ttyin
process response from /dev/tty

from kernighan and pike, page 185
*/

#include <stdio.h>

int ttyin()
{
	char buf[BUFSIZ];
	FILE *efopen();
	static FILE *tty = NULL;
	
	if (tty == NULL)
		tty = efopen("/dev/tty", "r");
		
	for (;;)
	{
		if (fgets(buf, BUFSIZ, tty) == NULL || buf[0] == 'q')
		{
			exit(0);
		}
		else if (buf[0] == '!')
		{
			system(buf + 1);	/* possible bug here */
			printf("!\n");
		}
		else	/*ordinary line*/
		{
			return buf[0];
		}
	}
}