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/* $OpenBSD: lib_ungetch.c,v 1.2 1998/07/23 21:19:46 millert Exp $ */
/****************************************************************************
* Copyright (c) 1998 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
****************************************************************************/
/*
** lib_ungetch.c
**
** The routine ungetch().
**
*/
#include <curses.priv.h>
MODULE_ID("$From: lib_ungetch.c,v 1.2 1998/02/11 12:13:56 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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