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Diffstat (limited to 'contrib/ncurses/ncurses/base/lib_getch.c')
-rw-r--r--contrib/ncurses/ncurses/base/lib_getch.c414
1 files changed, 414 insertions, 0 deletions
diff --git a/contrib/ncurses/ncurses/base/lib_getch.c b/contrib/ncurses/ncurses/base/lib_getch.c
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+/****************************************************************************
+ * 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_getch.c
+**
+** The routine getch().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_getch.c,v 1.43 1999/03/08 02:35:10 tom Exp $")
+
+#include <fifo_defs.h>
+
+int ESCDELAY = 1000; /* max interval betw. chars in funkeys, in millisecs */
+
+#ifdef USE_EMX_MOUSE
+# include <sys/select.h>
+static int
+kbd_mouse_read(unsigned char *p)
+{
+fd_set fdset;
+int nums = SP->_ifd+1;
+
+ for (;;) {
+ FD_ZERO(&fdset);
+ FD_SET(SP->_checkfd, &fdset);
+ if (SP->_mouse_fd >= 0) {
+ FD_SET(SP->_mouse_fd, &fdset);
+ if (SP->_mouse_fd > SP->_checkfd)
+ nums = SP->_mouse_fd+1;
+ }
+ if (select(nums, &fdset, NULL, NULL, NULL) >= 0) {
+ int n;
+
+ if (FD_ISSET(SP->_mouse_fd, &fdset)) /* Prefer mouse */
+ n = read(SP->_mouse_fd, p, 1);
+ else
+ n = read(SP->_ifd, p, 1);
+ return n;
+ }
+ if (errno != EINTR)
+ return -1;
+ }
+}
+#endif /* USE_EMX_MOUSE */
+
+static inline int fifo_peek(void)
+{
+ int ch = SP->_fifo[peek];
+ T(("peeking at %d", peek));
+
+ p_inc();
+ return ch;
+}
+
+
+static inline int fifo_pull(void)
+{
+int ch;
+ ch = SP->_fifo[head];
+ T(("pulling %d from %d", ch, head));
+
+ if (peek == head)
+ {
+ h_inc();
+ peek = head;
+ }
+ else
+ h_inc();
+
+#ifdef TRACE
+ if (_nc_tracing & TRACE_IEVENT) _nc_fifo_dump();
+#endif
+ return ch;
+}
+
+static inline int fifo_push(void)
+{
+int n;
+unsigned int ch;
+
+ if (tail == -1) return ERR;
+
+#ifdef HIDE_EINTR
+again:
+ errno = 0;
+#endif
+
+#if USE_GPM_SUPPORT
+ if ((SP->_mouse_fd >= 0)
+ && (_nc_timed_wait(3, -1, (int *)0) & 2))
+ {
+ SP->_mouse_event(SP);
+ ch = KEY_MOUSE;
+ n = 1;
+ } else
+#endif
+ {
+ unsigned char c2=0;
+#ifdef USE_EMX_MOUSE
+ n = kbd_mouse_read(&c2);
+#else
+ n = read(SP->_ifd, &c2, 1);
+#endif
+ ch = c2 & 0xff;
+ }
+
+#ifdef HIDE_EINTR
+ /*
+ * Under System V curses with non-restarting signals, getch() returns
+ * with value ERR when a handled signal keeps it from completing.
+ * If signals restart system calls, OTOH, the signal is invisible
+ * except to its handler.
+ *
+ * We don't want this difference to show. This piece of code
+ * tries to make it look like we always have restarting signals.
+ */
+ if (n <= 0 && errno == EINTR)
+ goto again;
+#endif
+
+ if ((n == -1) || (n == 0))
+ {
+ T(("read(%d,&ch,1)=%d, errno=%d", SP->_ifd, n, errno));
+ return ERR;
+ }
+ T(("read %d characters", n));
+
+ SP->_fifo[tail] = ch;
+ SP->_fifohold = 0;
+ if (head == -1)
+ head = peek = tail;
+ t_inc();
+ T(("pushed %#x at %d", ch, tail));
+#ifdef TRACE
+ if (_nc_tracing & TRACE_IEVENT) _nc_fifo_dump();
+#endif
+ return ch;
+}
+
+static inline void fifo_clear(void)
+{
+int i;
+ for (i = 0; i < FIFO_SIZE; i++)
+ SP->_fifo[i] = 0;
+ head = -1; tail = peek = 0;
+}
+
+static int kgetch(WINDOW *);
+
+#define wgetch_should_refresh(win) (\
+ (is_wintouched(win) || (win->_flags & _HASMOVED)) \
+ && !(win->_flags & _ISPAD))
+
+int
+wgetch(WINDOW *win)
+{
+int ch;
+
+ T((T_CALLED("wgetch(%p)"), win));
+
+ if (!win)
+ returnCode(ERR);
+
+ if (cooked_key_in_fifo())
+ {
+ if (wgetch_should_refresh(win))
+ wrefresh(win);
+
+ ch = fifo_pull();
+ T(("wgetch returning (pre-cooked): %#x = %s", ch, _trace_key(ch));)
+ returnCode(ch);
+ }
+
+ /*
+ * Handle cooked mode. Grab a string from the screen,
+ * stuff its contents in the FIFO queue, and pop off
+ * the first character to return it.
+ */
+ if (head == -1 && !SP->_raw && !SP->_cbreak)
+ {
+ char buf[MAXCOLUMNS], *sp;
+
+ T(("filling queue in cooked mode"));
+
+ wgetnstr(win, buf, MAXCOLUMNS);
+
+ /* ungetch in reverse order */
+ ungetch('\n');
+ for (sp = buf+strlen(buf); sp>buf; sp--)
+ ungetch(sp[-1]);
+
+ returnCode(fifo_pull());
+ }
+
+ if (wgetch_should_refresh(win))
+ wrefresh(win);
+
+ if (!win->_notimeout && (win->_delay >= 0 || SP->_cbreak > 1))
+ {
+ int delay;
+
+ T(("timed delay in wgetch()"));
+ if (SP->_cbreak > 1)
+ delay = (SP->_cbreak - 1) * 100;
+ else
+ delay = win->_delay;
+
+ T(("delay is %d milliseconds", delay));
+
+ if (head == -1) /* fifo is empty */
+ if (!_nc_timed_wait(3, delay, (int *)0))
+ returnCode(ERR);
+ /* else go on to read data available */
+ }
+
+ if (win->_use_keypad)
+ {
+ /*
+ * This is tricky. We only want to get special-key
+ * events one at a time. But we want to accumulate
+ * mouse events until either (a) the mouse logic tells
+ * us it's picked up a complete gesture, or (b)
+ * there's a detectable time lapse after one.
+ *
+ * Note: if the mouse code starts failing to compose
+ * press/release events into clicks, you should probably
+ * increase the wait with mouseinterval().
+ */
+ int runcount = 0;
+
+ do {
+ ch = kgetch(win);
+ if (ch == KEY_MOUSE)
+ {
+ ++runcount;
+ if (SP->_mouse_inline(SP))
+ break;
+ }
+ } while
+ (ch == KEY_MOUSE
+ && (_nc_timed_wait(3, SP->_maxclick, (int *)0)
+ || !SP->_mouse_parse(runcount)));
+ if (runcount > 0 && ch != KEY_MOUSE)
+ {
+ /* mouse event sequence ended by keystroke, push it */
+ ungetch(ch);
+ ch = KEY_MOUSE;
+ }
+ } else {
+ if (head == -1)
+ fifo_push();
+ ch = fifo_pull();
+ }
+
+ if (ch == ERR)
+ {
+#if USE_SIZECHANGE
+ if(SP->_sig_winch)
+ {
+ _nc_update_screensize();
+ /* resizeterm can push KEY_RESIZE */
+ if(cooked_key_in_fifo())
+ {
+ ch = fifo_pull();
+ T(("wgetch returning (pre-cooked): %#x = %s", ch, _trace_key(ch));)
+ returnCode(ch);
+ }
+ }
+#endif
+ T(("wgetch returning ERR"));
+ returnCode(ERR);
+ }
+
+ /*
+ * Simulate ICRNL mode
+ */
+ if ((ch == '\r') && SP->_nl)
+ ch = '\n';
+
+ /* Strip 8th-bit if so desired. We do this only for characters that
+ * are in the range 128-255, to provide compatibility with terminals
+ * that display only 7-bit characters. Note that 'ch' may be a
+ * function key at this point, so we mustn't strip _those_.
+ */
+ if ((ch < KEY_MIN) && (ch & 0x80))
+ if (!SP->_use_meta)
+ ch &= 0x7f;
+
+ if (SP->_echo && ch < KEY_MIN && !(win->_flags & _ISPAD))
+ wechochar(win, (chtype)ch);
+
+ T(("wgetch returning : %#x = %s", ch, _trace_key(ch)));
+
+ returnCode(ch);
+}
+
+
+/*
+** int
+** kgetch()
+**
+** Get an input character, but take care of keypad sequences, returning
+** an appropriate code when one matches the input. After each character
+** is received, set an alarm call based on ESCDELAY. If no more of the
+** sequence is received by the time the alarm goes off, pass through
+** the sequence gotten so far.
+**
+** This function must be called when there is no cooked keys in queue.
+** (that is head==-1 || peek==head)
+**
+*/
+
+static int
+kgetch(WINDOW *win GCC_UNUSED)
+{
+struct tries *ptr;
+int ch = 0;
+int timeleft = ESCDELAY;
+
+ TR(TRACE_IEVENT, ("kgetch(%p) called", win));
+
+ ptr = SP->_keytry;
+
+ for(;;)
+ {
+ if (!raw_key_in_fifo())
+ {
+ if(fifo_push() == ERR)
+ {
+ peek = head; /* the keys stay uninterpreted */
+ return ERR;
+ }
+ }
+ ch = fifo_peek();
+ if (ch >= KEY_MIN)
+ {
+ peek = head;
+ /* assume the key is the last in fifo */
+ t_dec(); /* remove the key */
+ return ch;
+ }
+
+ TR(TRACE_IEVENT, ("ch: %s", _trace_key((unsigned char)ch)));
+ while ((ptr != NULL) && (ptr->ch != (unsigned char)ch))
+ ptr = ptr->sibling;
+#ifdef TRACE
+ if (ptr == NULL)
+ {TR(TRACE_IEVENT, ("ptr is null"));}
+ else
+ TR(TRACE_IEVENT, ("ptr=%p, ch=%d, value=%d",
+ ptr, ptr->ch, ptr->value));
+#endif /* TRACE */
+
+ if (ptr == NULL)
+ break;
+
+ 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())
+ {
+ TR(TRACE_IEVENT, ("waiting for rest of sequence"));
+ if (!_nc_timed_wait(3, timeleft, &timeleft)) {
+ TR(TRACE_IEVENT, ("ran out of time"));
+ break;
+ }
+ }
+ }
+ ch = fifo_pull();
+ peek = head;
+ return ch;
+}
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