ftp.nice.ch/Attic/openStep/unix/mail/appnmail.1.8.s.bs.tgz#/appnmail.Solaris/regex-0.12/test/printchar.c

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void
printchar (c)
     char c;
{
  if (c < 040 || c >= 0177)
    {
      putchar ('\\');
      putchar (((c >> 6) & 3) + '0');
      putchar (((c >> 3) & 7) + '0');
      putchar ((c & 7) + '0');
    }
  else
    putchar (c);
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.