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/* $OpenBSD: lib_ungetch.c,v 1.1 1997/12/03 05:21:39 millert Exp $ */
/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
/*
** lib_ungetch.c
**
** The routine ungetch().
**
*/
#include <curses.priv.h>
MODULE_ID("Id: lib_ungetch.c,v 1.1 1997/10/19 02:59:56 tom Exp $")
#include <fifo_defs.h>
#ifdef TRACE
void _nc_fifo_dump(void)
{
int i;
T(("head = %d, tail = %d, peek = %d", head, tail, peek));
for (i = 0; i < 10; i++)
T(("char %d = %s", i, _trace_key(SP->_fifo[i])));
}
#endif /* TRACE */
int ungetch(int ch)
{
if (tail == -1)
return ERR;
if (head == -1) {
head = 0;
t_inc()
peek = tail; /* no raw keys */
} else
h_dec();
SP->_fifo[head] = ch;
T(("ungetch %#x ok", ch));
#ifdef TRACE
if (_nc_tracing & TRACE_IEVENT) _nc_fifo_dump();
#endif
return OK;
}
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