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93 lines
3.5 KiB
C
93 lines
3.5 KiB
C
/****************************************************************************
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* Copyright (c) 1998-2008,2009 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* "Software"), to deal in the Software without restriction, including *
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* without limitation the rights to use, copy, modify, merge, publish, *
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* distribute, distribute with modifications, sublicense, and/or sell *
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* copies of the Software, and to permit persons to whom the Software is *
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* furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included *
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* in all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Except as contained in this notice, the name(s) of the above copyright *
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* holders shall not be used in advertising or otherwise to promote the *
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* sale, use or other dealings in this Software without prior written *
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* authorization. *
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****************************************************************************/
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/****************************************************************************
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* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
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* and: Eric S. Raymond <esr@snark.thyrsus.com> *
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* and: Thomas E. Dickey 1996-on *
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* and: Juergen Pfeifer 2009 *
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****************************************************************************/
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/*
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** lib_ungetch.c
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**
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** The routine ungetch().
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**
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*/
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#include <curses.priv.h>
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MODULE_ID("$Id: lib_ungetch.c,v 1.13 2009/04/18 20:30:12 tom Exp $")
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#include <fifo_defs.h>
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#ifdef TRACE
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NCURSES_EXPORT(void)
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_nc_fifo_dump(SCREEN *sp)
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{
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int i;
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T(("head = %d, tail = %d, peek = %d", head, tail, peek));
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for (i = 0; i < 10; i++)
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T(("char %d = %s", i, _nc_tracechar(sp, sp->_fifo[i])));
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}
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#endif /* TRACE */
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NCURSES_EXPORT(int)
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safe_ungetch(SCREEN *sp, int ch)
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{
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int rc = ERR;
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T((T_CALLED("ungetch(%p,%s)"), sp, _nc_tracechar(sp, ch)));
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if (tail != -1) {
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if (head == -1) {
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head = 0;
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t_inc();
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peek = tail; /* no raw keys */
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} else
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h_dec();
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sp->_fifo[head] = ch;
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T(("ungetch %s ok", _nc_tracechar(sp, ch)));
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#ifdef TRACE
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if (USE_TRACEF(TRACE_IEVENT)) {
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_nc_fifo_dump(sp);
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_nc_unlock_global(tracef);
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}
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#endif
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rc = OK;
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}
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returnCode(rc);
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}
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NCURSES_EXPORT(int)
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ungetch(int ch)
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{
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return safe_ungetch(CURRENT_SCREEN, ch);
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}
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