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- /****************************************************************************
- * Copyright (c) 1998-2001,2002 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 *
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- ****************************************************************************/
-
- /****************************************************************************
- * 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("$Id: lib_ungetch.c,v 1.8 2002/08/24 22:08:48 tom Exp $")
-
- #include <fifo_defs.h>
-
- #ifdef TRACE
- NCURSES_EXPORT(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, _tracechar(SP->_fifo[i])));
- }
- #endif /* TRACE */
-
- NCURSES_EXPORT(int)
- ungetch(int ch)
- {
- T((T_CALLED("ungetch(%s)"), _tracechar(ch)));
-
- if (tail == -1)
- returnCode(ERR);
- if (head == -1) {
- head = 0;
- t_inc()
- peek = tail; /* no raw keys */
- } else
- h_dec();
-
- SP->_fifo[head] = ch;
- T(("ungetch %s ok", _tracechar(ch)));
- #ifdef TRACE
- if (_nc_tracing & TRACE_IEVENT)
- _nc_fifo_dump();
- #endif
- returnCode(OK);
- }
-