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577 lines
15 KiB
C
577 lines
15 KiB
C
/****************************************************************************
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* Copyright (c) 1998-2003,2005 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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****************************************************************************/
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/*
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** lib_getch.c
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**
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** The routine getch().
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**
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*/
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#include <curses.priv.h>
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MODULE_ID("$Id: lib_getch.c,v 1.73 2005/06/11 18:08:57 tom Exp $")
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#include <fifo_defs.h>
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NCURSES_EXPORT_VAR(int)
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ESCDELAY = 1000; /* max interval betw. chars in funkeys, in millisecs */
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#ifdef NCURSES_WGETCH_EVENTS
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#define TWAIT_MASK 7
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#else
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#define TWAIT_MASK 3
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#endif
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/*
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* Check for mouse activity, returning nonzero if we find any.
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*/
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static int
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check_mouse_activity(int delay EVENTLIST_2nd(_nc_eventlist * evl))
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{
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int rc;
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#if USE_SYSMOUSE
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if ((SP->_mouse_type == M_SYSMOUSE)
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&& (SP->_sysmouse_head < SP->_sysmouse_tail)) {
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return 2;
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}
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#endif
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rc = _nc_timed_wait(TWAIT_MASK, delay, (int *) 0 EVENTLIST_2nd(evl));
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#if USE_SYSMOUSE
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if ((SP->_mouse_type == M_SYSMOUSE)
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&& (SP->_sysmouse_head < SP->_sysmouse_tail)
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&& (rc == 0)
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&& (errno == EINTR)) {
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rc |= 2;
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}
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#endif
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return rc;
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}
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static inline int
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fifo_peek(void)
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{
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int ch = SP->_fifo[peek];
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TR(TRACE_IEVENT, ("peeking at %d", peek));
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p_inc();
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return ch;
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}
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static inline int
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fifo_pull(void)
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{
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int ch;
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ch = SP->_fifo[head];
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TR(TRACE_IEVENT, ("pulling %s from %d", _tracechar(ch), head));
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if (peek == head) {
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h_inc();
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peek = head;
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} else
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h_inc();
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#ifdef TRACE
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if (_nc_tracing & TRACE_IEVENT)
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_nc_fifo_dump();
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#endif
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return ch;
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}
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static inline int
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fifo_push(EVENTLIST_0th(_nc_eventlist * evl))
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{
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int n;
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int ch = 0;
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int mask = 0;
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(void) mask;
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if (tail == -1)
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return ERR;
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#ifdef HIDE_EINTR
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again:
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errno = 0;
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#endif
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#ifdef NCURSES_WGETCH_EVENTS
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if (evl
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#if USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
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|| (SP->_mouse_fd >= 0)
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#endif
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) {
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mask = check_mouse_activity(-1 EVENTLIST_2nd(evl));
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} else
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mask = 0;
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if (mask & 4) {
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T(("fifo_push: ungetch KEY_EVENT"));
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ungetch(KEY_EVENT);
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return KEY_EVENT;
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}
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#elif USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
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if (SP->_mouse_fd >= 0) {
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mask = check_mouse_activity(-1 EVENTLIST_2nd(evl));
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}
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#endif
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#if USE_GPM_SUPPORT || USE_EMX_MOUSE
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if ((SP->_mouse_fd >= 0) && (mask & 2)) {
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SP->_mouse_event(SP);
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ch = KEY_MOUSE;
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n = 1;
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} else
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#endif
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#if USE_SYSMOUSE
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if ((SP->_mouse_type == M_SYSMOUSE)
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&& (SP->_sysmouse_head < SP->_sysmouse_tail)) {
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SP->_mouse_event(SP);
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ch = KEY_MOUSE;
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n = 1;
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} else if ((SP->_mouse_type == M_SYSMOUSE)
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&& (mask <= 0) && errno == EINTR) {
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SP->_mouse_event(SP);
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ch = KEY_MOUSE;
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n = 1;
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} else
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#endif
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{ /* Can block... */
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unsigned char c2 = 0;
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n = read(SP->_ifd, &c2, 1);
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ch = c2;
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}
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#ifdef HIDE_EINTR
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/*
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* Under System V curses with non-restarting signals, getch() returns
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* with value ERR when a handled signal keeps it from completing.
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* If signals restart system calls, OTOH, the signal is invisible
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* except to its handler.
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*
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* We don't want this difference to show. This piece of code
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* tries to make it look like we always have restarting signals.
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*/
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if (n <= 0 && errno == EINTR)
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goto again;
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#endif
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if ((n == -1) || (n == 0)) {
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TR(TRACE_IEVENT, ("read(%d,&ch,1)=%d, errno=%d", SP->_ifd, n, errno));
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ch = ERR;
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}
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TR(TRACE_IEVENT, ("read %d characters", n));
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SP->_fifo[tail] = ch;
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SP->_fifohold = 0;
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if (head == -1)
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head = peek = tail;
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t_inc();
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TR(TRACE_IEVENT, ("pushed %s at %d", _tracechar(ch), tail));
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#ifdef TRACE
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if (_nc_tracing & TRACE_IEVENT)
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_nc_fifo_dump();
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#endif
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return ch;
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}
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static inline void
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fifo_clear(void)
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{
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memset(SP->_fifo, 0, sizeof(SP->_fifo));
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head = -1;
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tail = peek = 0;
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}
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static int kgetch(EVENTLIST_0th(_nc_eventlist * evl));
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#define wgetch_should_refresh(win) (\
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(is_wintouched(win) || (win->_flags & _HASMOVED)) \
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&& !(win->_flags & _ISPAD))
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NCURSES_EXPORT(int)
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_nc_wgetch(WINDOW *win,
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unsigned long *result,
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int use_meta
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EVENTLIST_2nd(_nc_eventlist * evl))
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{
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int ch;
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#ifdef NCURSES_WGETCH_EVENTS
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long event_delay = -1;
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#endif
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T((T_CALLED("_nc_wgetch(%p)"), win));
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*result = 0;
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if (win == 0 || SP == 0)
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returnCode(ERR);
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if (cooked_key_in_fifo()) {
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if (wgetch_should_refresh(win))
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wrefresh(win);
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*result = fifo_pull();
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returnCode(OK);
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}
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#ifdef NCURSES_WGETCH_EVENTS
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if (evl && (evl->count == 0))
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evl = NULL;
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event_delay = _nc_eventlist_timeout(evl);
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#endif
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/*
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* Handle cooked mode. Grab a string from the screen,
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* stuff its contents in the FIFO queue, and pop off
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* the first character to return it.
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*/
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if (head == -1 &&
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!SP->_notty &&
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!SP->_raw &&
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!SP->_cbreak &&
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!SP->_called_wgetch) {
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char buf[MAXCOLUMNS], *sp;
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int rc;
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TR(TRACE_IEVENT, ("filling queue in cooked mode"));
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SP->_called_wgetch = TRUE;
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rc = wgetnstr(win, buf, MAXCOLUMNS);
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SP->_called_wgetch = FALSE;
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/* ungetch in reverse order */
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#ifdef NCURSES_WGETCH_EVENTS
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if (rc != KEY_EVENT)
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#endif
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ungetch('\n');
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for (sp = buf + strlen(buf); sp > buf; sp--)
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ungetch(sp[-1]);
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#ifdef NCURSES_WGETCH_EVENTS
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/* Return it first */
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if (rc == KEY_EVENT) {
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*result = rc;
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returnCode(OK);
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}
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#endif
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*result = fifo_pull();
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returnCode(OK);
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}
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if (win->_use_keypad != SP->_keypad_on)
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_nc_keypad(win->_use_keypad);
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if (wgetch_should_refresh(win))
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wrefresh(win);
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if (!win->_notimeout && (win->_delay >= 0 || SP->_cbreak > 1)) {
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int delay;
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TR(TRACE_IEVENT, ("timed delay in wgetch()"));
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if (SP->_cbreak > 1)
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delay = (SP->_cbreak - 1) * 100;
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else
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delay = win->_delay;
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#ifdef NCURSES_WGETCH_EVENTS
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if (event_delay >= 0 && delay > event_delay)
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delay = event_delay;
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#endif
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TR(TRACE_IEVENT, ("delay is %d milliseconds", delay));
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if (head == -1) { /* fifo is empty */
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int rc = check_mouse_activity(delay EVENTLIST_2nd(evl));
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#ifdef NCURSES_WGETCH_EVENTS
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if (rc & 4) {
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*result = KEY_EVENT;
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returnCode(OK);
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}
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#endif
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if (!rc)
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returnCode(ERR);
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}
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/* else go on to read data available */
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}
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if (win->_use_keypad) {
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/*
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* This is tricky. We only want to get special-key
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* events one at a time. But we want to accumulate
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* mouse events until either (a) the mouse logic tells
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* us it's picked up a complete gesture, or (b)
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* there's a detectable time lapse after one.
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*
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* Note: if the mouse code starts failing to compose
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* press/release events into clicks, you should probably
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* increase the wait with mouseinterval().
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*/
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int runcount = 0;
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int rc;
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do {
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ch = kgetch(EVENTLIST_1st(evl));
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if (ch == KEY_MOUSE) {
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++runcount;
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if (SP->_mouse_inline(SP))
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break;
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}
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if (SP->_maxclick < 0)
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break;
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} while
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(ch == KEY_MOUSE
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&& (((rc = check_mouse_activity(SP->_maxclick
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EVENTLIST_2nd(evl))) != 0
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&& !(rc & 4))
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|| !SP->_mouse_parse(runcount)));
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#ifdef NCURSES_WGETCH_EVENTS
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if ((rc & 4) && !ch == KEY_EVENT) {
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ungetch(ch);
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ch = KEY_EVENT;
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}
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#endif
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if (runcount > 0 && ch != KEY_MOUSE) {
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#ifdef NCURSES_WGETCH_EVENTS
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/* mouse event sequence ended by an event, report event */
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if (ch == KEY_EVENT) {
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ungetch(KEY_MOUSE); /* FIXME This interrupts a gesture... */
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} else
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#endif
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{
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/* mouse event sequence ended by keystroke, store keystroke */
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ungetch(ch);
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ch = KEY_MOUSE;
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}
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}
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} else {
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if (head == -1)
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fifo_push(EVENTLIST_1st(evl));
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ch = fifo_pull();
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}
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if (ch == ERR) {
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#if USE_SIZECHANGE
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if (SP->_sig_winch) {
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_nc_update_screensize();
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/* resizeterm can push KEY_RESIZE */
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if (cooked_key_in_fifo()) {
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*result = fifo_pull();
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returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
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}
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}
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#endif
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returnCode(ERR);
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}
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/*
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* If echo() is in effect, display the printable version of the
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* key on the screen. Carriage return and backspace are treated
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* specially by Solaris curses:
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*
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* If carriage return is defined as a function key in the
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* terminfo, e.g., kent, then Solaris may return either ^J (or ^M
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* if nonl() is set) or KEY_ENTER depending on the echo() mode.
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* We echo before translating carriage return based on nonl(),
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* since the visual result simply moves the cursor to column 0.
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*
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* Backspace is a different matter. Solaris curses does not
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* translate it to KEY_BACKSPACE if kbs=^H. This does not depend
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* on the stty modes, but appears to be a hardcoded special case.
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* This is a difference from ncurses, which uses the terminfo entry.
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* However, we provide the same visual result as Solaris, moving the
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* cursor to the left.
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*/
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if (SP->_echo && !(win->_flags & _ISPAD)) {
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chtype backup = (ch == KEY_BACKSPACE) ? '\b' : ch;
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if (backup < KEY_MIN)
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wechochar(win, backup);
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}
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/*
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* Simulate ICRNL mode
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*/
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if ((ch == '\r') && SP->_nl)
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ch = '\n';
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/* Strip 8th-bit if so desired. We do this only for characters that
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* are in the range 128-255, to provide compatibility with terminals
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* that display only 7-bit characters. Note that 'ch' may be a
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* function key at this point, so we mustn't strip _those_.
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*/
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if (!use_meta)
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if ((ch < KEY_MIN) && (ch & 0x80))
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ch &= 0x7f;
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T(("wgetch returning : %s", _tracechar(ch)));
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*result = ch;
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returnCode(ch >= KEY_MIN ? KEY_CODE_YES : OK);
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}
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#ifdef NCURSES_WGETCH_EVENTS
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NCURSES_EXPORT(int)
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wgetch_events(WINDOW *win, _nc_eventlist * evl)
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{
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int code;
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unsigned long value;
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T((T_CALLED("wgetch_events(%p,%p)"), win, evl));
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code = _nc_wgetch(win,
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&value,
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SP->_use_meta
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EVENTLIST_2nd(evl));
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if (code != ERR)
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code = value;
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returnCode(code);
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}
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#endif
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NCURSES_EXPORT(int)
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wgetch(WINDOW *win)
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{
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int code;
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unsigned long value;
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T((T_CALLED("wgetch(%p)"), win));
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code = _nc_wgetch(win,
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&value,
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(SP ? SP->_use_meta : 0)
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EVENTLIST_2nd((_nc_eventlist *) 0));
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if (code != ERR)
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code = value;
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returnCode(code);
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}
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/*
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** int
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** kgetch()
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**
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** Get an input character, but take care of keypad sequences, returning
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** an appropriate code when one matches the input. After each character
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** is received, set an alarm call based on ESCDELAY. If no more of the
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** sequence is received by the time the alarm goes off, pass through
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** the sequence gotten so far.
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**
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** This function must be called when there are no cooked keys in queue.
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** (that is head==-1 || peek==head)
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**
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*/
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static int
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kgetch(EVENTLIST_0th(_nc_eventlist * evl))
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{
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struct tries *ptr;
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int ch = 0;
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int timeleft = ESCDELAY;
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TR(TRACE_IEVENT, ("kgetch() called"));
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ptr = SP->_keytry;
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for (;;) {
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if (cooked_key_in_fifo() && SP->_fifo[head] >= KEY_MIN) {
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break;
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} else if (!raw_key_in_fifo()) {
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ch = fifo_push(EVENTLIST_1st(evl));
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if (ch == ERR) {
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peek = head; /* the keys stay uninterpreted */
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return ERR;
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}
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#ifdef NCURSES_WGETCH_EVENTS
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else if (ch == KEY_EVENT) {
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peek = head; /* the keys stay uninterpreted */
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return fifo_pull(); /* Remove KEY_EVENT from the queue */
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}
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#endif
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}
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ch = fifo_peek();
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if (ch >= KEY_MIN) {
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/* If not first in queue, somebody put this key there on purpose in
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* emergency. Consider it higher priority than the unfinished
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* keysequence we are parsing.
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*/
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peek = head;
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/* assume the key is the last in fifo */
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t_dec(); /* remove the key */
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return ch;
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}
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TR(TRACE_IEVENT, ("ch: %s", _tracechar((unsigned char) ch)));
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while ((ptr != NULL) && (ptr->ch != (unsigned char) ch))
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ptr = ptr->sibling;
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if (ptr == NULL) {
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TR(TRACE_IEVENT, ("ptr is null"));
|
|
break;
|
|
}
|
|
TR(TRACE_IEVENT, ("ptr=%p, ch=%d, value=%d",
|
|
ptr, ptr->ch, ptr->value));
|
|
|
|
if (ptr->value != 0) { /* sequence terminated */
|
|
TR(TRACE_IEVENT, ("end of sequence"));
|
|
if (peek == tail)
|
|
fifo_clear();
|
|
else
|
|
head = peek;
|
|
return (ptr->value);
|
|
}
|
|
|
|
ptr = ptr->child;
|
|
|
|
if (!raw_key_in_fifo()) {
|
|
int rc;
|
|
|
|
TR(TRACE_IEVENT, ("waiting for rest of sequence"));
|
|
rc = check_mouse_activity(timeleft EVENTLIST_2nd(evl));
|
|
#ifdef NCURSES_WGETCH_EVENTS
|
|
if (rc & 4) {
|
|
TR(TRACE_IEVENT, ("interrupted by a user event"));
|
|
/* FIXME Should have preserved remainder timeleft for reusal... */
|
|
peek = head; /* Restart interpreting later */
|
|
return KEY_EVENT;
|
|
}
|
|
#endif
|
|
if (!rc) {
|
|
TR(TRACE_IEVENT, ("ran out of time"));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ch = fifo_pull();
|
|
peek = head;
|
|
return ch;
|
|
}
|