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/* discard.c - discard output on a file pointer */
#ifndef lint
static char ident[] = "@(#)$Id: discard.c,v 1.7 1993/02/26 21:56:04 jromine Exp $";
#endif /* lint */
#include "../h/mh.h"
#include <stdio.h>
#ifdef POSIX
#include <termios.h>
#else
#ifndef SYS5
#include <sgtty.h>
#else /* SYS5 */
#include <sys/types.h>
#include <termio.h>
#ifndef NOIOCTLH
#include <sys/ioctl.h>
#endif /* NOIOCTLH */
#endif /* SYS5 */
#endif /* POSIX */
void discard (io)
FILE *io;
{
#ifndef POSIX
#ifndef SYS5
struct sgttyb sg;
#else /* SYS5 */
struct termio sg;
#endif /* SYS5 */
#endif /* POSIX */
if (io == NULL)
return;
#ifdef POSIX
tcflush (fileno (io), TCOFLUSH);
#else
#ifndef SYS5
if (ioctl (fileno (io), TIOCGETP, (char *) &sg) != NOTOK)
(void) ioctl (fileno (io), TIOCSETP, (char *) &sg);
#else /* SYS5 */
if (ioctl (fileno (io), TCGETA, &sg) != NOTOK)
(void) ioctl (fileno (io), TCSETA, &sg);
#endif /* SYS5 */
#endif /* POSIX */
#ifdef _FSTDIO
fpurge (io);
#else
#ifdef _STDIO_USES_IOSTREAM
io -> _IO_write_ptr = io -> _IO_write_base;
#else
if (io -> _ptr = io -> _base)
io -> _cnt = 0;
#endif
#endif /* _STDIO_USES_IOSTREAM */
}
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