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authorPeter Wemm <peter@FreeBSD.org>1999-08-24 01:06:48 +0000
committerPeter Wemm <peter@FreeBSD.org>1999-08-24 01:06:48 +0000
commit0e3d540892016a47f6a68ec9ba2879d35ce5f7c2 (patch)
treead214c5b2c8142ad6dc6d2ce3a9c83e6317d7f77 /contrib/ncurses/ncurses/tty/lib_twait.c
downloadsrc-0e3d540892016a47f6a68ec9ba2879d35ce5f7c2.tar.gz
src-0e3d540892016a47f6a68ec9ba2879d35ce5f7c2.zip
Import unmodified (but trimmed) ncurses 5.0 prerelease 990821.vendor/ncurses/5.0-19990821
This contains the full eti (panel, form, menu) extensions. bmake glue to follow. Obtained from: ftp://ftp.clark.net/pub/dickey/ncurses
Notes
Notes: svn path=/vendor/ncurses/dist/; revision=50276 svn path=/vendor/ncurses/5.0-19990821/; revision=50278; tag=vendor/ncurses/5.0-19990821
Diffstat (limited to 'contrib/ncurses/ncurses/tty/lib_twait.c')
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diff --git a/contrib/ncurses/ncurses/tty/lib_twait.c b/contrib/ncurses/ncurses/tty/lib_twait.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_twait.c
+**
+** The routine _nc_timed_wait().
+**
+** (This file was originally written by Eric Raymond; however except for
+** comments, none of the original code remains - T.Dickey).
+*/
+
+#include <curses.priv.h>
+
+#if USE_FUNC_POLL
+# include <stropts.h>
+# include <poll.h>
+# if HAVE_SYS_TIME_H
+# include <sys/time.h>
+# endif
+#elif HAVE_SELECT
+# if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
+# include <sys/time.h>
+# endif
+# if HAVE_SYS_SELECT_H
+# include <sys/select.h>
+# endif
+#endif
+
+#ifdef __BEOS__
+/* BeOS select() only works on sockets. Use the tty hack instead */
+#include <socket.h>
+#define select check_select
+#endif
+
+MODULE_ID("$Id: lib_twait.c,v 1.32 1998/06/06 22:44:14 tom Exp $")
+
+static int _nc_gettime(void)
+{
+ int res;
+
+#if HAVE_GETTIMEOFDAY
+# define PRECISE_GETTIME 1
+ struct timeval t;
+ gettimeofday(&t, (struct timezone *)0);
+ res = t.tv_sec*1000 + t.tv_usec/1000;
+#else
+# define PRECISE_GETTIME 0
+ res = time(0)*1000;
+#endif
+ T(("time: %d msec", res));
+ return res;
+}
+
+/*
+ * Wait a specified number of milliseconds, returning nonzero if the timer
+ * didn't expire before there is activity on the specified file descriptors.
+ * The file-descriptors are specified by the mode:
+ * 0 - none (absolute time)
+ * 1 - ncurses' normal input-descriptor
+ * 2 - mouse descriptor, if any
+ * 3 - either input or mouse.
+ * We return a mask that corresponds to the mode (e.g., 2 for mouse activity).
+ *
+ * If the milliseconds given are -1, the wait blocks until activity on the
+ * descriptors.
+ */
+int _nc_timed_wait(int mode, int milliseconds, int *timeleft)
+{
+int fd;
+int count;
+
+int result;
+
+#if USE_FUNC_POLL
+struct pollfd fds[2];
+#elif HAVE_SELECT
+static fd_set set;
+#endif
+
+int starttime, returntime;
+
+ T(("start twait: %d milliseconds, mode: %d", milliseconds, mode));
+
+#if PRECISE_GETTIME
+retry:
+#endif
+ starttime = _nc_gettime();
+
+ count = 0;
+
+#if USE_FUNC_POLL
+ if (mode & 1) {
+ fds[count].fd = SP->_ifd;
+ fds[count].events = POLLIN;
+ count++;
+ }
+ if ((mode & 2)
+ && (fd = SP->_mouse_fd) >= 0) {
+ fds[count].fd = fd;
+ fds[count].events = POLLIN;
+ count++;
+ }
+ result = poll(fds, count, milliseconds);
+
+#elif HAVE_SELECT
+ /*
+ * select() modifies the fd_set arguments; do this in the
+ * loop.
+ */
+ FD_ZERO(&set);
+
+ if (mode & 1) {
+ FD_SET(SP->_ifd, &set);
+ count = SP->_ifd + 1;
+ }
+ if ((mode & 2)
+ && (fd = SP->_mouse_fd) >= 0) {
+ FD_SET(fd, &set);
+ count = max(fd, count) + 1;
+ }
+
+ if (milliseconds >= 0) {
+ struct timeval ntimeout;
+ ntimeout.tv_sec = milliseconds / 1000;
+ ntimeout.tv_usec = (milliseconds % 1000) * 1000;
+ result = select(count, &set, NULL, NULL, &ntimeout);
+ } else {
+ result = select(count, &set, NULL, NULL, NULL);
+ }
+#endif
+
+ returntime = _nc_gettime();
+
+ if (milliseconds >= 0)
+ milliseconds -= returntime-starttime;
+
+#if PRECISE_GETTIME
+ /*
+ * If the timeout hasn't expired, and we've gotten no data,
+ * this is probably a system where 'select()' needs to be left
+ * alone so that it can complete. Make this process sleep,
+ * then come back for more.
+ */
+ if (result == 0 && milliseconds > 100) {
+ napms(100);
+ milliseconds -= 100;
+ goto retry;
+ }
+#endif
+
+ /* return approximate time left in milliseconds */
+ if (timeleft)
+ *timeleft = milliseconds;
+
+ T(("end twait: returned %d (%d), remaining time %d msec",
+ result, errno, milliseconds));
+
+ /*
+ * Both 'poll()' and 'select()' return the number of file descriptors
+ * that are active. Translate this back to the mask that denotes which
+ * file-descriptors, so that we don't need all of this system-specific
+ * code everywhere.
+ */
+ if (result != 0) {
+ if (result > 0) {
+ result = 0;
+#if USE_FUNC_POLL
+ for (count = 0; count < 2; count++) {
+ if ((mode & (1 << count))
+ && (fds[count].revents & POLLIN)) {
+ result |= (1 << count);
+ count++;
+ }
+ }
+#elif HAVE_SELECT
+ if ((mode & 2)
+ && (fd = SP->_mouse_fd) >= 0
+ && FD_ISSET(fd, &set))
+ result |= 2;
+ if ((mode & 1)
+ && FD_ISSET(SP->_ifd, &set))
+ result |= 1;
+#endif
+ }
+ else
+ result = 0;
+ }
+
+ return (result);
+}