#include <stdio.h>
#include <ctype.h>
#include <termio.h>

int main()
{
  struct termio old, new;

  fputs("secho v1.1\n",stderr);
  fputs("Type INTR (usually DEL) to exit this program\n",stderr);

  /* save current terminal settings */
  if (ioctl(0,TCGETA,&old) == -1) {
    perror("ioctl");
    return 1;
  }

  /* turn off all system character processing */
  new = old;
  new.c_iflag &= ~(INLCR | IGNCR | ICRNL);
  new.c_lflag &= ~(ICANON | ECHO | ISIG);
  new.c_cc[VMIN] = 1;
  new.c_cc[VTIME] = 0;

  /* tell system about new settings */
  if (ioctl(0,TCSETAW,&new) == -1) {
    perror("ioctl");
    return 1;
  }

  /* read incoming characters and write printable versions */
  for (;;) {
    int i = getchar();
    if (i == old.c_cc[VINTR]) break;
    if (isascii(i) && isprint(i))
      putchar(i);
    else if (i < 32)
      printf("^%c",i + '@');
    else if (i == 127)
      printf("^?");
    else
      printf("\\%o",i);
    if (i == '\n')
      putchar(i);
  }

  /* restore terminal settings and exit */
  ioctl(0,TCSETAW,&old);
  return 0;
}