Terminal Stuff

gistfile1.c

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

int
main(void)
{
  struct termios iattr;
  int ret;
  if (ret = tcgetattr(STDIN_FILENO, &iattr), ret < 0) {
    switch (errno) {
      case EBADF:
        printf("Standard input is closed.\n");
        
      case ENOTTY:
        printf("Standard input is not a terminal.\n");
    }
    
    goto fail;
  }
  
  iattr.c_lflag &= ~(ICANON | ECHO);
  
attr: ret = tcsetattr(STDIN_FILENO, TCSANOW, &iattr);
  if (ret < 0) {
    switch (errno) {
      case EINTR:
        goto attr;
        
      case EINVAL:
        printf("Invalid argument passed to tcsetattr().\n");
        
      case EBADF:
        printf("Standard input is closed.\n");
        
      case ENOTTY:
        printf("Standard input is not a terminal.\n");
        
      case EIO:
        printf("IO Error!\n");
    }
    
    goto fail;
  }
  
loop: ret = getchar();
  if (ret == EOF) {
    goto exit;
  }
  
  printf("(%c)", (char) ret % 128);
  
  goto loop;
  
exit:
  return EXIT_SUCCESS;
  
fail:
  return EXIT_FAILURE;
}