Modula2_kilo/Done/step18/doc3.c

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
/* Use this variable to remember original terminal attributes. */

struct termios saved_attributes;

void reset_input_mode (void)
    {
        tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
    }
    
void set_input_mode (void)
{
    struct termios tattr;
    /* Make sure stdin is a terminal. */
    if (!isatty (STDIN_FILENO))
    {
    fprintf (stderr, "Not a terminal.\n");
    exit (EXIT_FAILURE);
    }
    /* Save the terminal attributes so we can restore them later. */
    tcgetattr (STDIN_FILENO, &saved_attributes);
    atexit (reset_input_mode);
    /* Set the funny terminal modes. */
    tcgetattr (STDIN_FILENO, &tattr);
    tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
    tattr.c_cc[VMIN] = 1;
    tattr.c_cc[VTIME] = 0;
    tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr);
}
    
int main (void)
    {
    char c;
    
    set_input_mode ();
    while (1)
        {
        read (STDIN_FILENO, &c, 1);
        if (c == '\004')
        /* C-d */
        break;
        else
        write (STDOUT_FILENO, &c, 1);
        }
        
    return EXIT_SUCCESS;
}