diff --git a/ncurses/base/lib_mouse.c b/ncurses/base/lib_mouse.c
new file mode 100644
index 0000000..95f29aa
--- /dev/null
+++ b/ncurses/base/lib_mouse.c
@@ -0,0 +1,1435 @@
+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 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>                         *
+ *     and: Thomas E. Dickey                        1996-on                 *
+ ****************************************************************************/
+
+/*
+ * This module is intended to encapsulate ncurses's interface to pointing
+ * devices.
+ *
+ * The primary method used is xterm's internal mouse-tracking facility.
+ * Additional methods depend on the platform:
+ *	Alessandro Rubini's GPM server (Linux)
+ *	sysmouse (FreeBSD)
+ *	special-purpose mouse interface for OS/2 EMX.
+ *
+ * Notes for implementors of new mouse-interface methods:
+ *
+ * The code is logically split into a lower level that accepts event reports
+ * in a device-dependent format and an upper level that parses mouse gestures
+ * and filters events.  The mediating data structure is a circular queue of
+ * MEVENT structures.
+ *
+ * Functionally, the lower level's job is to pick up primitive events and
+ * put them on the circular queue.  This can happen in one of two ways:
+ * either (a) _nc_mouse_event() detects a series of incoming mouse reports
+ * and queues them, or (b) code in lib_getch.c detects the kmous prefix in
+ * the keyboard input stream and calls _nc_mouse_inline to queue up a series
+ * of adjacent mouse reports.
+ *
+ * In either case, _nc_mouse_parse() should be called after the series is
+ * accepted to parse the digested mouse reports (low-level MEVENTs) into
+ * a gesture (a high-level or composite MEVENT).
+ *
+ * Don't be too shy about adding new event types or modifiers, if you can find
+ * room for them in the 32-bit mask.  The API is written so that users get
+ * feedback on which theoretical event types they won't see when they call
+ * mousemask. There's one bit per button (the RESERVED_EVENT bit) not being
+ * used yet, and a couple of bits open at the high end.
+ */
+
+#ifdef __EMX__
+#  include <io.h>
+#  define  INCL_DOS
+#  define  INCL_VIO
+#  define  INCL_KBD
+#  define  INCL_MOU
+#  define  INCL_DOSPROCESS
+#  include <os2.h>		/* Need to include before the others */
+#endif
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_mouse.c,v 1.102 2008/10/18 21:48:55 tom Exp $")
+
+#include <term.h>
+#include <tic.h>
+
+#if USE_GPM_SUPPORT
+#include <linux/keyboard.h>	/* defines KG_* macros */
+
+#ifdef HAVE_LIBDL
+/* use dynamic loader to avoid linkage dependency */
+#include <dlfcn.h>
+
+#ifdef RTLD_NOW
+#define my_RTLD RTLD_NOW
+#else
+#ifdef RTLD_LAZY
+#define my_RTLD RTLD_LAZY
+#else
+make an error
+#endif
+#endif				/* RTLD_NOW */
+#endif				/* HAVE_LIBDL */
+
+#endif				/* USE_GPM_SUPPORT */
+
+#if USE_SYSMOUSE
+#undef buttons			/* symbol conflict in consio.h */
+#undef mouse_info		/* symbol conflict in consio.h */
+#include <osreldate.h>
+#if (__FreeBSD_version >= 400017)
+#include <sys/consio.h>
+#include <sys/fbio.h>
+#else
+#include <machine/console.h>
+#endif
+#endif				/* use_SYSMOUSE */
+
+#define MY_TRACE TRACE_ICALLS|TRACE_IEVENT
+
+#define	MASK_RELEASE(x)		NCURSES_MOUSE_MASK(x, 001)
+#define	MASK_PRESS(x)		NCURSES_MOUSE_MASK(x, 002)
+#define	MASK_CLICK(x)		NCURSES_MOUSE_MASK(x, 004)
+#define	MASK_DOUBLE_CLICK(x)	NCURSES_MOUSE_MASK(x, 010)
+#define	MASK_TRIPLE_CLICK(x)	NCURSES_MOUSE_MASK(x, 020)
+#define	MASK_RESERVED_EVENT(x)	NCURSES_MOUSE_MASK(x, 040)
+
+#if NCURSES_MOUSE_VERSION == 1
+#define BUTTON_CLICKED        (BUTTON1_CLICKED        | BUTTON2_CLICKED        | BUTTON3_CLICKED        | BUTTON4_CLICKED)
+#define BUTTON_PRESSED        (BUTTON1_PRESSED        | BUTTON2_PRESSED        | BUTTON3_PRESSED        | BUTTON4_PRESSED)
+#define BUTTON_RELEASED       (BUTTON1_RELEASED       | BUTTON2_RELEASED       | BUTTON3_RELEASED       | BUTTON4_RELEASED)
+#define BUTTON_DOUBLE_CLICKED (BUTTON1_DOUBLE_CLICKED | BUTTON2_DOUBLE_CLICKED | BUTTON3_DOUBLE_CLICKED | BUTTON4_DOUBLE_CLICKED)
+#define BUTTON_TRIPLE_CLICKED (BUTTON1_TRIPLE_CLICKED | BUTTON2_TRIPLE_CLICKED | BUTTON3_TRIPLE_CLICKED | BUTTON4_TRIPLE_CLICKED)
+#define MAX_BUTTONS  4
+#else
+#define BUTTON_CLICKED        (BUTTON1_CLICKED        | BUTTON2_CLICKED        | BUTTON3_CLICKED        | BUTTON4_CLICKED        | BUTTON5_CLICKED)
+#define BUTTON_PRESSED        (BUTTON1_PRESSED        | BUTTON2_PRESSED        | BUTTON3_PRESSED        | BUTTON4_PRESSED        | BUTTON5_PRESSED)
+#define BUTTON_RELEASED       (BUTTON1_RELEASED       | BUTTON2_RELEASED       | BUTTON3_RELEASED       | BUTTON4_RELEASED       | BUTTON5_RELEASED)
+#define BUTTON_DOUBLE_CLICKED (BUTTON1_DOUBLE_CLICKED | BUTTON2_DOUBLE_CLICKED | BUTTON3_DOUBLE_CLICKED | BUTTON4_DOUBLE_CLICKED | BUTTON5_DOUBLE_CLICKED)
+#define BUTTON_TRIPLE_CLICKED (BUTTON1_TRIPLE_CLICKED | BUTTON2_TRIPLE_CLICKED | BUTTON3_TRIPLE_CLICKED | BUTTON4_TRIPLE_CLICKED | BUTTON5_TRIPLE_CLICKED)
+#define MAX_BUTTONS  5
+#endif
+
+#define INVALID_EVENT	-1
+#define NORMAL_EVENT	0
+
+#if USE_GPM_SUPPORT
+
+#ifndef LIBGPM_SONAME
+#define LIBGPM_SONAME "libgpm.so"
+#endif
+
+#define GET_DLSYM(name) (my_##name = (TYPE_##name) dlsym(SP->_dlopen_gpm, #name))
+
+#endif				/* USE_GPM_SUPPORT */
+
+static bool _nc_mouse_parse(SCREEN *, int);
+static void _nc_mouse_resume(SCREEN *);
+static void _nc_mouse_wrap(SCREEN *);
+
+/* maintain a circular list of mouse events */
+
+#define FirstEV(sp)	((sp)->_mouse_events)
+#define LastEV(sp)	((sp)->_mouse_events + EV_MAX - 1)
+
+#undef  NEXT
+#define NEXT(ep)	((ep >= LastEV(sp)) \
+			 ? FirstEV(sp) \
+			 : ep + 1)
+
+#undef  PREV
+#define PREV(ep)	((ep <= FirstEV(sp)) \
+			 ? LastEV(sp) \
+			 : ep - 1)
+
+#define IndexEV(sp, ep)	(ep - FirstEV(sp))
+
+#define RunParams(sp, eventp, runp) \
+		(long) IndexEV(sp, runp), \
+		(long) (IndexEV(sp, eventp) + (EV_MAX - 1)) % EV_MAX
+
+#ifdef TRACE
+static void
+_trace_slot(SCREEN *sp, const char *tag)
+{
+    MEVENT *ep;
+
+    _tracef(tag);
+
+    for (ep = FirstEV(sp); ep <= LastEV(sp); ep++)
+	_tracef("mouse event queue slot %ld = %s",
+		(long) IndexEV(sp, ep),
+		_nc_tracemouse(sp, ep));
+}
+#endif
+
+#if USE_EMX_MOUSE
+
+#  define TOP_ROW          0
+#  define LEFT_COL         0
+
+#  define M_FD(sp) sp->_mouse_fd
+
+static void
+write_event(SCREEN *sp, int down, int button, int x, int y)
+{
+    char buf[6];
+    unsigned long ignore;
+
+    strncpy(buf, key_mouse, 3);	/* should be "\033[M" */
+    buf[3] = ' ' + (button - 1) + (down ? 0 : 0x40);
+    buf[4] = ' ' + x - LEFT_COL + 1;
+    buf[5] = ' ' + y - TOP_ROW + 1;
+    DosWrite(sp->_emxmouse_wfd, buf, 6, &ignore);
+}
+
+static void
+mouse_server(unsigned long param)
+{
+    SCREEN *sp = (SCREEN *) param;
+    unsigned short fWait = MOU_WAIT;
+    /* NOPTRRECT mourt = { 0,0,24,79 }; */
+    MOUEVENTINFO mouev;
+    HMOU hmou;
+    unsigned short mask = MOUSE_BN1_DOWN | MOUSE_BN2_DOWN | MOUSE_BN3_DOWN;
+    int nbuttons = 3;
+    int oldstate = 0;
+    char err[80];
+    unsigned long rc;
+
+    /* open the handle for the mouse */
+    if (MouOpen(NULL, &hmou) == 0) {
+	rc = MouSetEventMask(&mask, hmou);
+	if (rc) {		/* retry with 2 buttons */
+	    mask = MOUSE_BN1_DOWN | MOUSE_BN2_DOWN;
+	    rc = MouSetEventMask(&mask, hmou);
+	    nbuttons = 2;
+	}
+	if (rc == 0 && MouDrawPtr(hmou) == 0) {
+	    for (;;) {
+		/* sit and wait on the event queue */
+		rc = MouReadEventQue(&mouev, &fWait, hmou);
+		if (rc) {
+		    sprintf(err, "Error reading mouse queue, rc=%lu.\r\n", rc);
+		    break;
+		}
+		if (!sp->_emxmouse_activated)
+		    goto finish;
+
+		/*
+		 * OS/2 numbers a 3-button mouse inconsistently from other
+		 * platforms:
+		 *      1 = left
+		 *      2 = right
+		 *      3 = middle.
+		 */
+		if ((mouev.fs ^ oldstate) & MOUSE_BN1_DOWN)
+		    write_event(sp, mouev.fs & MOUSE_BN1_DOWN,
+				sp->_emxmouse_buttons[1], mouev.col, mouev.row);
+		if ((mouev.fs ^ oldstate) & MOUSE_BN2_DOWN)
+		    write_event(sp, mouev.fs & MOUSE_BN2_DOWN,
+				sp->_emxmouse_buttons[3], mouev.col, mouev.row);
+		if ((mouev.fs ^ oldstate) & MOUSE_BN3_DOWN)
+		    write_event(sp, mouev.fs & MOUSE_BN3_DOWN,
+				sp->_emxmouse_buttons[2], mouev.col, mouev.row);
+
+	      finish:
+		oldstate = mouev.fs;
+	    }
+	} else
+	    sprintf(err, "Error setting event mask, buttons=%d, rc=%lu.\r\n",
+		    nbuttons, rc);
+
+	DosWrite(2, err, strlen(err), &rc);
+	MouClose(hmou);
+    }
+    DosExit(EXIT_THREAD, 0L);
+}
+
+#endif /* USE_EMX_MOUSE */
+
+#if USE_SYSMOUSE
+static void
+sysmouse_server(SCREEN *sp)
+{
+    struct mouse_info the_mouse;
+    MEVENT *work;
+
+    the_mouse.operation = MOUSE_GETINFO;
+    if (sp != 0
+	&& sp->_mouse_fd >= 0
+	&& sp->_sysmouse_tail < FIFO_SIZE
+	&& ioctl(sp->_mouse_fd, CONS_MOUSECTL, &the_mouse) != -1) {
+
+	if (sp->_sysmouse_head > sp->_sysmouse_tail) {
+	    sp->_sysmouse_tail = 0;
+	    sp->_sysmouse_head = 0;
+	}
+	work = &(sp->_sysmouse_fifo[sp->_sysmouse_tail]);
+	memset(work, 0, sizeof(*work));
+	work->id = NORMAL_EVENT;	/* there's only one mouse... */
+
+	sp->_sysmouse_old_buttons = sp->_sysmouse_new_buttons;
+	sp->_sysmouse_new_buttons = the_mouse.u.data.buttons & 0x7;
+
+	if (sp->_sysmouse_new_buttons) {
+	    if (sp->_sysmouse_new_buttons & 1)
+		work->bstate |= BUTTON1_PRESSED;
+	    if (sp->_sysmouse_new_buttons & 2)
+		work->bstate |= BUTTON2_PRESSED;
+	    if (sp->_sysmouse_new_buttons & 4)
+		work->bstate |= BUTTON3_PRESSED;
+	} else {
+	    if (sp->_sysmouse_old_buttons & 1)
+		work->bstate |= BUTTON1_RELEASED;
+	    if (sp->_sysmouse_old_buttons & 2)
+		work->bstate |= BUTTON2_RELEASED;
+	    if (sp->_sysmouse_old_buttons & 4)
+		work->bstate |= BUTTON3_RELEASED;
+	}
+
+	/* for cosmetic bug in syscons.c on FreeBSD 3.[34] */
+	the_mouse.operation = MOUSE_HIDE;
+	ioctl(sp->_mouse_fd, CONS_MOUSECTL, &the_mouse);
+	the_mouse.operation = MOUSE_SHOW;
+	ioctl(sp->_mouse_fd, CONS_MOUSECTL, &the_mouse);
+
+	/*
+	 * We're only interested if the button is pressed or released.
+	 * FIXME: implement continuous event-tracking.
+	 */
+	if (sp->_sysmouse_new_buttons != sp->_sysmouse_old_buttons) {
+	    sp->_sysmouse_tail += 1;
+	}
+	work->x = the_mouse.u.data.x / sp->_sysmouse_char_width;
+	work->y = the_mouse.u.data.y / sp->_sysmouse_char_height;
+    }
+}
+
+static void
+handle_sysmouse(int sig GCC_UNUSED)
+{
+    sysmouse_server(SP);
+}
+#endif /* USE_SYSMOUSE */
+
+static void
+init_xterm_mouse(SCREEN *sp)
+{
+    sp->_mouse_type = M_XTERM;
+    sp->_mouse_xtermcap = tigetstr("XM");
+    if (!VALID_STRING(sp->_mouse_xtermcap))
+	sp->_mouse_xtermcap = "\033[?1000%?%p1%{1}%=%th%el%;";
+}
+
+static void
+enable_xterm_mouse(SCREEN *sp, int enable)
+{
+#if USE_EMX_MOUSE
+    sp->_emxmouse_activated = enable;
+#else
+    putp(TPARM_1(sp->_mouse_xtermcap, enable));
+#endif
+    sp->_mouse_active = enable;
+}
+
+#if USE_GPM_SUPPORT
+static bool
+allow_gpm_mouse(void)
+{
+    bool result = FALSE;
+
+    /* GPM does printf's without checking if stdout is a terminal */
+    if (isatty(fileno(stdout))) {
+	char *list = getenv("NCURSES_GPM_TERMS");
+	char *env = getenv("TERM");
+	if (list != 0) {
+	    if (env != 0) {
+		result = _nc_name_match(list, env, "|:");
+	    }
+	} else {
+	    /* GPM checks the beginning of the $TERM variable to decide if it
+	     * should pass xterm events through.  There is no real advantage in
+	     * allowing GPM to do this.  Recent versions relax that check, and
+	     * pretend that GPM can work with any terminal having the kmous
+	     * capability.  Perhaps that works for someone.  If so, they can
+	     * set the environment variable (above).
+	     */
+	    if (env != 0 && strstr(env, "linux") != 0) {
+		result = TRUE;
+	    }
+	}
+    }
+    return result;
+}
+
+#ifdef HAVE_LIBDL
+static void
+unload_gpm_library(SCREEN *sp)
+{
+    if (SP->_dlopen_gpm != 0) {
+	T(("unload GPM library"));
+	sp->_mouse_gpm_loaded = FALSE;
+	sp->_mouse_fd = -1;
+	dlclose(sp->_dlopen_gpm);
+	sp->_dlopen_gpm = 0;
+    }
+}
+
+static void
+load_gpm_library(SCREEN *sp)
+{
+    sp->_mouse_gpm_found = FALSE;
+    if ((sp->_dlopen_gpm = dlopen(LIBGPM_SONAME, my_RTLD)) != 0) {
+	if (GET_DLSYM(gpm_fd) == 0 ||
+	    GET_DLSYM(Gpm_Open) == 0 ||
+	    GET_DLSYM(Gpm_Close) == 0 ||
+	    GET_DLSYM(Gpm_GetEvent) == 0) {
+	    T(("GPM initialization failed: %s", dlerror()));
+	    unload_gpm_library(sp);
+	} else {
+	    sp->_mouse_gpm_found = TRUE;
+	    sp->_mouse_gpm_loaded = TRUE;
+	}
+    }
+}
+#endif
+
+static bool
+enable_gpm_mouse(SCREEN *sp, bool enable)
+{
+    bool result;
+
+    T((T_CALLED("enable_gpm_mouse(%d)"), enable));
+
+    if (enable && !sp->_mouse_active) {
+#ifdef HAVE_LIBDL
+	if (sp->_mouse_gpm_found && !sp->_mouse_gpm_loaded) {
+	    load_gpm_library(sp);
+	}
+#endif
+	if (sp->_mouse_gpm_loaded) {
+	    /* GPM: initialize connection to gpm server */
+	    sp->_mouse_gpm_connect.eventMask = GPM_DOWN | GPM_UP;
+	    sp->_mouse_gpm_connect.defaultMask =
+		(unsigned short) (~(sp->_mouse_gpm_connect.eventMask | GPM_HARD));
+	    sp->_mouse_gpm_connect.minMod = 0;
+	    sp->_mouse_gpm_connect.maxMod =
+		(unsigned short) (~((1 << KG_SHIFT) |
+				    (1 << KG_SHIFTL) |
+				    (1 << KG_SHIFTR)));
+	    /*
+	     * Note: GPM hardcodes \E[?1001s and \E[?1000h during its open.
+	     * The former is recognized by wscons (SunOS), and the latter by
+	     * xterm.  Those will not show up in ncurses' traces.
+	     */
+	    result = (my_Gpm_Open(&sp->_mouse_gpm_connect, 0) >= 0);
+	} else {
+	    result = FALSE;
+	}
+	sp->_mouse_active = result;
+	T(("GPM open %s", result ? "succeeded" : "failed"));
+    } else {
+	if (!enable && sp->_mouse_active) {
+	    /* GPM: close connection to gpm server */
+	    my_Gpm_Close();
+	    sp->_mouse_active = FALSE;
+	    T(("GPM closed"));
+	}
+	result = enable;
+    }
+#ifdef HAVE_LIBDL
+    if (!result) {
+	unload_gpm_library(sp);
+    }
+#endif
+    returnBool(result);
+}
+#endif /* USE_GPM_SUPPORT */
+
+#define xterm_kmous "\033[M"
+
+static void
+initialize_mousetype(SCREEN *sp)
+{
+    T((T_CALLED("initialize_mousetype()")));
+
+    /* Try gpm first, because gpm may be configured to run in xterm */
+#if USE_GPM_SUPPORT
+    if (allow_gpm_mouse()) {
+	if (!sp->_mouse_gpm_loaded) {
+#ifdef HAVE_LIBDL
+	    load_gpm_library(sp);
+#else /* !HAVE_LIBDL */
+	    sp->_mouse_gpm_found = TRUE;
+	    sp->_mouse_gpm_loaded = TRUE;
+#endif
+	}
+
+	/*
+	 * The gpm_fd file-descriptor may be negative (xterm).  So we have to
+	 * maintain our notion of whether the mouse connection is active
+	 * without testing the file-descriptor.
+	 */
+	if (sp->_mouse_gpm_found && enable_gpm_mouse(sp, TRUE)) {
+	    sp->_mouse_type = M_GPM;
+	    sp->_mouse_fd = *(my_gpm_fd);
+	    T(("GPM mouse_fd %d", sp->_mouse_fd));
+	    returnVoid;
+	}
+    }
+#endif /* USE_GPM_SUPPORT */
+
+    /* OS/2 VIO */
+#if USE_EMX_MOUSE
+    if (!sp->_emxmouse_thread
+	&& strstr(cur_term->type.term_names, "xterm") == 0
+	&& key_mouse) {
+	int handles[2];
+
+	if (pipe(handles) < 0) {
+	    perror("mouse pipe error");
+	    returnVoid;
+	} else {
+	    int rc;
+
+	    if (!sp->_emxmouse_buttons[0]) {
+		char *s = getenv("MOUSE_BUTTONS_123");
+
+		sp->_emxmouse_buttons[0] = 1;
+		if (s && strlen(s) >= 3) {
+		    sp->_emxmouse_buttons[1] = s[0] - '0';
+		    sp->_emxmouse_buttons[2] = s[1] - '0';
+		    sp->_emxmouse_buttons[3] = s[2] - '0';
+		} else {
+		    sp->_emxmouse_buttons[1] = 1;
+		    sp->_emxmouse_buttons[2] = 3;
+		    sp->_emxmouse_buttons[3] = 2;
+		}
+	    }
+	    sp->_emxmouse_wfd = handles[1];
+	    M_FD(sp) = handles[0];
+	    /* Needed? */
+	    setmode(handles[0], O_BINARY);
+	    setmode(handles[1], O_BINARY);
+	    /* Do not use CRT functions, we may single-threaded. */
+	    rc = DosCreateThread((unsigned long *) &sp->_emxmouse_thread,
+				 mouse_server, (long) sp, 0, 8192);
+	    if (rc) {
+		printf("mouse thread error %d=%#x", rc, rc);
+	    } else {
+		sp->_mouse_type = M_XTERM;
+	    }
+	    returnVoid;
+	}
+    }
+#endif /* USE_EMX_MOUSE */
+
+#if USE_SYSMOUSE
+    {
+	struct mouse_info the_mouse;
+	char *the_device = 0;
+
+	if (isatty(sp->_ifd))
+	    the_device = ttyname(sp->_ifd);
+	if (the_device == 0)
+	    the_device = "/dev/tty";
+
+	sp->_mouse_fd = open(the_device, O_RDWR);
+
+	if (sp->_mouse_fd >= 0) {
+	    /*
+	     * sysmouse does not have a usable user interface for obtaining
+	     * mouse events.  The logical way to proceed (reading data on a
+	     * stream) only works if one opens the device as root.  Even in
+	     * that mode, careful examination shows we lose events
+	     * occasionally.  The interface provided for user programs is to
+	     * establish a signal handler.  really.
+	     *
+	     * Take over SIGUSR2 for this purpose since SIGUSR1 is more
+	     * likely to be used by an application.  getch() will have to
+	     * handle the misleading EINTR's.
+	     */
+	    signal(SIGUSR2, SIG_IGN);
+	    the_mouse.operation = MOUSE_MODE;
+	    the_mouse.u.mode.mode = 0;
+	    the_mouse.u.mode.signal = SIGUSR2;
+	    if (ioctl(sp->_mouse_fd, CONS_MOUSECTL, &the_mouse) != -1) {
+		signal(SIGUSR2, handle_sysmouse);
+		the_mouse.operation = MOUSE_SHOW;
+		ioctl(sp->_mouse_fd, CONS_MOUSECTL, &the_mouse);
+
+#if defined(FBIO_MODEINFO) || defined(CONS_MODEINFO)	/* FreeBSD > 2.x */
+		{
+#ifndef FBIO_GETMODE		/* FreeBSD 3.x */
+#define FBIO_GETMODE    CONS_GET
+#define FBIO_MODEINFO   CONS_MODEINFO
+#endif /* FBIO_GETMODE */
+		    video_info_t the_video;
+
+		    if (ioctl(sp->_mouse_fd,
+			      FBIO_GETMODE,
+			      &the_video.vi_mode) != -1
+			&& ioctl(sp->_mouse_fd,
+				 FBIO_MODEINFO,
+				 &the_video) != -1) {
+			sp->_sysmouse_char_width = the_video.vi_cwidth;
+			sp->_sysmouse_char_height = the_video.vi_cheight;
+		    }
+		}
+#endif /* defined(FBIO_MODEINFO) || defined(CONS_MODEINFO) */
+
+		if (sp->_sysmouse_char_width <= 0)
+		    sp->_sysmouse_char_width = 8;
+		if (sp->_sysmouse_char_height <= 0)
+		    sp->_sysmouse_char_height = 16;
+		sp->_mouse_type = M_SYSMOUSE;
+		returnVoid;
+	    }
+	}
+    }
+#endif /* USE_SYSMOUSE */
+
+    /* we know how to recognize mouse events under "xterm" */
+    if (key_mouse != 0) {
+	if (!strcmp(key_mouse, xterm_kmous)
+	    || strstr(cur_term->type.term_names, "xterm") != 0) {
+	    init_xterm_mouse(sp);
+	}
+    } else if (strstr(cur_term->type.term_names, "xterm") != 0) {
+	if (_nc_add_to_try(&(sp->_keytry), xterm_kmous, KEY_MOUSE) == OK)
+	    init_xterm_mouse(sp);
+    }
+    returnVoid;
+}
+
+static bool
+_nc_mouse_init(SCREEN *sp)
+/* initialize the mouse */
+{
+    bool result = FALSE;
+    int i;
+
+    if (sp != 0) {
+	if (!sp->_mouse_initialized) {
+	    sp->_mouse_initialized = TRUE;
+
+	    TR(MY_TRACE, ("_nc_mouse_init() called"));
+
+	    sp->_mouse_eventp = FirstEV(sp);
+	    for (i = 0; i < EV_MAX; i++)
+		sp->_mouse_events[i].id = INVALID_EVENT;
+
+	    initialize_mousetype(sp);
+
+	    T(("_nc_mouse_init() set mousetype to %d", sp->_mouse_type));
+	}
+	result = sp->_mouse_initialized;
+    }
+    return result;
+}
+
+/*
+ * Query to see if there is a pending mouse event.  This is called from
+ * fifo_push() in lib_getch.c
+ */
+static bool
+_nc_mouse_event(SCREEN *sp GCC_UNUSED)
+{
+    MEVENT *eventp = sp->_mouse_eventp;
+    bool result = FALSE;
+
+    (void) eventp;
+
+    switch (sp->_mouse_type) {
+    case M_XTERM:
+	/* xterm: never have to query, mouse events are in the keyboard stream */
+#if USE_EMX_MOUSE
+	{
+	    char kbuf[3];
+
+	    int i, res = read(M_FD(sp), &kbuf, 3);	/* Eat the prefix */
+	    if (res != 3)
+		printf("Got %d chars instead of 3 for prefix.\n", res);
+	    for (i = 0; i < res; i++) {
+		if (kbuf[i] != key_mouse[i])
+		    printf("Got char %d instead of %d for prefix.\n",
+			   (int) kbuf[i], (int) key_mouse[i]);
+	    }
+	    result = TRUE;
+	}
+#endif /* USE_EMX_MOUSE */
+	break;
+
+#if USE_GPM_SUPPORT
+    case M_GPM:
+	{
+	    /* query server for event, return TRUE if we find one */
+	    Gpm_Event ev;
+
+	    if (my_Gpm_GetEvent(&ev) == 1) {
+		/* there's only one mouse... */
+		eventp->id = NORMAL_EVENT;
+
+		eventp->bstate = 0;
+		switch (ev.type & 0x0f) {
+		case (GPM_DOWN):
+		    if (ev.buttons & GPM_B_LEFT)
+			eventp->bstate |= BUTTON1_PRESSED;
+		    if (ev.buttons & GPM_B_MIDDLE)
+			eventp->bstate |= BUTTON2_PRESSED;
+		    if (ev.buttons & GPM_B_RIGHT)
+			eventp->bstate |= BUTTON3_PRESSED;
+		    break;
+		case (GPM_UP):
+		    if (ev.buttons & GPM_B_LEFT)
+			eventp->bstate |= BUTTON1_RELEASED;
+		    if (ev.buttons & GPM_B_MIDDLE)
+			eventp->bstate |= BUTTON2_RELEASED;
+		    if (ev.buttons & GPM_B_RIGHT)
+			eventp->bstate |= BUTTON3_RELEASED;
+		    break;
+		default:
+		    break;
+		}
+
+		eventp->x = ev.x - 1;
+		eventp->y = ev.y - 1;
+		eventp->z = 0;
+
+		/* bump the next-free pointer into the circular list */
+		sp->_mouse_eventp = eventp = NEXT(eventp);
+		result = TRUE;
+	    }
+	}
+	break;
+#endif
+
+#if USE_SYSMOUSE
+    case M_SYSMOUSE:
+	if (sp->_sysmouse_head < sp->_sysmouse_tail) {
+	    *eventp = sp->_sysmouse_fifo[sp->_sysmouse_head];
+
+	    /*
+	     * Point the fifo-head to the next possible location.  If there
+	     * are none, reset the indices.  This may be interrupted by the
+	     * signal handler, doing essentially the same reset.
+	     */
+	    sp->_sysmouse_head += 1;
+	    if (sp->_sysmouse_head == sp->_sysmouse_tail) {
+		sp->_sysmouse_tail = 0;
+		sp->_sysmouse_head = 0;
+	    }
+
+	    /* bump the next-free pointer into the circular list */
+	    sp->_mouse_eventp = eventp = NEXT(eventp);
+	    result = TRUE;
+	}
+	break;
+#endif /* USE_SYSMOUSE */
+
+    case M_NONE:
+	break;
+    }
+
+    return result;		/* true if we found an event */
+}
+
+static bool
+_nc_mouse_inline(SCREEN *sp)
+/* mouse report received in the keyboard stream -- parse its info */
+{
+    int b;
+    bool result = FALSE;
+    MEVENT *eventp = sp->_mouse_eventp;
+
+    TR(MY_TRACE, ("_nc_mouse_inline() called"));
+
+    if (sp->_mouse_type == M_XTERM) {
+	unsigned char kbuf[4];
+	mmask_t prev;
+	size_t grabbed;
+	int res;
+
+	/* This code requires that your xterm entry contain the kmous
+	 * capability and that it be set to the \E[M documented in the
+	 * Xterm Control Sequences reference.  This is how we
+	 * arrange for mouse events to be reported via a KEY_MOUSE
+	 * return value from wgetch().  After this value is received,
+	 * _nc_mouse_inline() gets called and is immediately
+	 * responsible for parsing the mouse status information
+	 * following the prefix.
+	 *
+	 * The following quotes from the ctrlseqs.ms document in the
+	 * X distribution, describing the X mouse tracking feature:
+	 *
+	 * Parameters for all mouse tracking escape sequences
+	 * generated by xterm encode numeric parameters in a single
+	 * character as value+040.  For example, !  is 1.
+	 *
+	 * On button press or release, xterm sends ESC [ M CbCxCy.
+	 * The low two bits of Cb encode button information: 0=MB1
+	 * pressed, 1=MB2 pressed, 2=MB3 pressed, 3=release.  The
+	 * upper bits encode what modifiers were down when the
+	 * button was pressed and are added together.  4=Shift,
+	 * 8=Meta, 16=Control.  Cx and Cy are the x and y coordinates
+	 * of the mouse event.  The upper left corner is (1,1).
+	 *
+	 * (End quote)  By the time we get here, we've eaten the
+	 * key prefix.  FYI, the loop below is necessary because
+	 * mouse click info isn't guaranteed to present as a
+	 * single clist item.
+	 *
+	 * Wheel mice may return buttons 4 and 5 when the wheel is turned.
+	 * We encode those as button presses.
+	 */
+	for (grabbed = 0; grabbed < 3; grabbed += (size_t) res) {
+
+	    /* For VIO mouse we add extra bit 64 to disambiguate button-up. */
+#if USE_EMX_MOUSE
+	    res = read(M_FD(sp) >= 0 ? M_FD(sp) : sp->_ifd, &kbuf, 3);
+#else
+	    res = read(sp->_ifd, kbuf + grabbed, 3 - grabbed);
+#endif
+	    if (res == -1)
+		break;
+	}
+	kbuf[3] = '\0';
+
+	TR(TRACE_IEVENT,
+	   ("_nc_mouse_inline sees the following xterm data: '%s'", kbuf));
+
+	/* there's only one mouse... */
+	eventp->id = NORMAL_EVENT;
+
+	/* processing code goes here */
+	eventp->bstate = 0;
+	prev = PREV(eventp)->bstate;
+
+#if USE_EMX_MOUSE
+#define PRESS_POSITION(n) \
+	eventp->bstate = MASK_PRESS(n); \
+	if (kbuf[0] & 0x40) \
+	    eventp->bstate = MASK_RELEASE(n)
+#else
+#define PRESS_POSITION(n) \
+	eventp->bstate = (mmask_t) (prev & MASK_PRESS(n) \
+				    ? REPORT_MOUSE_POSITION \
+				    : MASK_PRESS(n))
+#endif
+
+	switch (kbuf[0] & 0x3) {
+	case 0x0:
+	    if (kbuf[0] & 64)
+		eventp->bstate = MASK_PRESS(4);
+	    else
+		PRESS_POSITION(1);
+	    break;
+
+	case 0x1:
+#if NCURSES_MOUSE_VERSION == 2
+	    if (kbuf[0] & 64)
+		eventp->bstate = MASK_PRESS(5);
+	    else
+#endif
+		PRESS_POSITION(2);
+	    break;
+
+	case 0x2:
+	    PRESS_POSITION(3);
+	    break;
+
+	case 0x3:
+	    /*
+	     * Release events aren't reported for individual buttons, just for
+	     * the button set as a whole.  However, because there are normally
+	     * no mouse events under xterm that intervene between press and
+	     * release, we can infer the button actually released by looking at
+	     * the previous event.
+	     */
+	    if (prev & (BUTTON_PRESSED | BUTTON_RELEASED)) {
+		eventp->bstate = BUTTON_RELEASED;
+		for (b = 1; b <= MAX_BUTTONS; ++b) {
+		    if (!(prev & MASK_PRESS(b)))
+			eventp->bstate &= ~MASK_RELEASE(b);
+		}
+	    } else {
+		/*
+		 * XFree86 xterm will return a stream of release-events to
+		 * let the application know where the mouse is going, if the
+		 * private mode 1002 or 1003 is enabled.
+		 */
+		eventp->bstate = REPORT_MOUSE_POSITION;
+	    }
+	    break;
+	}
+	result = (eventp->bstate & REPORT_MOUSE_POSITION) ? TRUE : FALSE;
+
+	if (kbuf[0] & 4) {
+	    eventp->bstate |= BUTTON_SHIFT;
+	}
+	if (kbuf[0] & 8) {
+	    eventp->bstate |= BUTTON_ALT;
+	}
+	if (kbuf[0] & 16) {
+	    eventp->bstate |= BUTTON_CTRL;
+	}
+
+	eventp->x = (kbuf[1] - ' ') - 1;
+	eventp->y = (kbuf[2] - ' ') - 1;
+	TR(MY_TRACE,
+	   ("_nc_mouse_inline: primitive mouse-event %s has slot %ld",
+	    _nc_tracemouse(sp, eventp),
+	    (long) IndexEV(sp, eventp)));
+
+	/* bump the next-free pointer into the circular list */
+	sp->_mouse_eventp = NEXT(eventp);
+#if 0				/* this return would be needed for QNX's mods to lib_getch.c */
+	return (TRUE);
+#endif
+    }
+
+    return (result);
+}
+
+static void
+mouse_activate(SCREEN *sp, bool on)
+{
+    if (!on && !sp->_mouse_initialized)
+	return;
+
+    if (!_nc_mouse_init(sp))
+	return;
+
+    if (on) {
+
+	switch (sp->_mouse_type) {
+	case M_XTERM:
+#if NCURSES_EXT_FUNCS
+	    keyok(KEY_MOUSE, on);
+#endif
+	    TPUTS_TRACE("xterm mouse initialization");
+	    enable_xterm_mouse(sp, 1);
+	    break;
+#if USE_GPM_SUPPORT
+	case M_GPM:
+	    if (enable_gpm_mouse(sp, TRUE)) {
+		sp->_mouse_fd = *(my_gpm_fd);
+		T(("GPM mouse_fd %d", sp->_mouse_fd));
+	    }
+	    break;
+#endif
+#if USE_SYSMOUSE
+	case M_SYSMOUSE:
+	    signal(SIGUSR2, handle_sysmouse);
+	    sp->_mouse_active = TRUE;
+	    break;
+#endif
+	case M_NONE:
+	    return;
+	}
+	/* Make runtime binding to cut down on object size of applications that
+	 * do not use the mouse (e.g., 'clear').
+	 */
+	sp->_mouse_event = _nc_mouse_event;
+	sp->_mouse_inline = _nc_mouse_inline;
+	sp->_mouse_parse = _nc_mouse_parse;
+	sp->_mouse_resume = _nc_mouse_resume;
+	sp->_mouse_wrap = _nc_mouse_wrap;
+    } else {
+
+	switch (sp->_mouse_type) {
+	case M_XTERM:
+	    TPUTS_TRACE("xterm mouse deinitialization");
+	    enable_xterm_mouse(sp, 0);
+	    break;
+#if USE_GPM_SUPPORT
+	case M_GPM:
+	    enable_gpm_mouse(sp, FALSE);
+	    break;
+#endif
+#if USE_SYSMOUSE
+	case M_SYSMOUSE:
+	    signal(SIGUSR2, SIG_IGN);
+	    sp->_mouse_active = FALSE;
+	    break;
+#endif
+	case M_NONE:
+	    return;
+	}
+    }
+    _nc_flush();
+}
+
+/**************************************************************************
+ *
+ * Device-independent code
+ *
+ **************************************************************************/
+
+static bool
+_nc_mouse_parse(SCREEN *sp, int runcount)
+/* parse a run of atomic mouse events into a gesture */
+{
+    MEVENT *eventp = sp->_mouse_eventp;
+    MEVENT *ep, *runp, *next, *prev = PREV(eventp);
+    int n;
+    int b;
+    bool merge;
+
+    TR(MY_TRACE, ("_nc_mouse_parse(%d) called", runcount));
+
+    /*
+     * When we enter this routine, the event list next-free pointer
+     * points just past a run of mouse events that we know were separated
+     * in time by less than the critical click interval. The job of this
+     * routine is to collapse this run into a single higher-level event
+     * or gesture.
+     *
+     * We accomplish this in two passes.  The first pass merges press/release
+     * pairs into click events.  The second merges runs of click events into
+     * double or triple-click events.
+     *
+     * It's possible that the run may not resolve to a single event (for
+     * example, if the user quadruple-clicks).  If so, leading events
+     * in the run are ignored.
+     *
+     * Note that this routine is independent of the format of the specific
+     * format of the pointing-device's reports.  We can use it to parse
+     * gestures on anything that reports press/release events on a per-
+     * button basis, as long as the device-dependent mouse code puts stuff
+     * on the queue in MEVENT format.
+     */
+    if (runcount == 1) {
+	TR(MY_TRACE,
+	   ("_nc_mouse_parse: returning simple mouse event %s at slot %ld",
+	    _nc_tracemouse(sp, prev),
+	    (long) IndexEV(sp, prev)));
+	return (prev->id >= NORMAL_EVENT)
+	    ? ((prev->bstate & sp->_mouse_mask) ? TRUE : FALSE)
+	    : FALSE;
+    }
+
+    /* find the start of the run */
+    runp = eventp;
+    for (n = runcount; n > 0; n--) {
+	runp = PREV(runp);
+    }
+
+#ifdef TRACE
+    if (USE_TRACEF(TRACE_IEVENT)) {
+	_trace_slot(sp, "before mouse press/release merge:");
+	_tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
+		RunParams(sp, eventp, runp),
+		runcount);
+	_nc_unlock_global(tracef);
+    }
+#endif /* TRACE */
+
+    /* first pass; merge press/release pairs */
+    do {
+	merge = FALSE;
+	for (ep = runp; (next = NEXT(ep)) != eventp; ep = next) {
+
+#define MASK_CHANGED(x) (!(ep->bstate & MASK_PRESS(x)) \
+		      == !(next->bstate & MASK_RELEASE(x)))
+
+	    if (ep->x == next->x && ep->y == next->y
+		&& (ep->bstate & BUTTON_PRESSED)
+		&& MASK_CHANGED(1)
+		&& MASK_CHANGED(2)
+		&& MASK_CHANGED(3)
+		&& MASK_CHANGED(4)
+#if NCURSES_MOUSE_VERSION == 2
+		&& MASK_CHANGED(5)
+#endif
+		) {
+		for (b = 1; b <= MAX_BUTTONS; ++b) {
+		    if ((sp->_mouse_mask & MASK_CLICK(b))
+			&& (ep->bstate & MASK_PRESS(b))) {
+			ep->bstate &= ~MASK_PRESS(b);
+			ep->bstate |= MASK_CLICK(b);
+			merge = TRUE;
+		    }
+		}
+		if (merge)
+		    next->id = INVALID_EVENT;
+	    }
+	}
+    } while
+	(merge);
+
+#ifdef TRACE
+    if (USE_TRACEF(TRACE_IEVENT)) {
+	_trace_slot(sp, "before mouse click merge:");
+	_tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
+		RunParams(sp, eventp, runp),
+		runcount);
+	_nc_unlock_global(tracef);
+    }
+#endif /* TRACE */
+
+    /*
+     * Second pass; merge click runs.  At this point, click events are
+     * each followed by one invalid event. We merge click events
+     * forward in the queue.
+     *
+     * NOTE: There is a problem with this design!  If the application
+     * allows enough click events to pile up in the circular queue so
+     * they wrap around, it will cheerfully merge the newest forward
+     * into the oldest, creating a bogus doubleclick and confusing
+     * the queue-traversal logic rather badly.  Generally this won't
+     * happen, because calling getmouse() marks old events invalid and
+     * ineligible for merges.  The true solution to this problem would
+     * be to timestamp each MEVENT and perform the obvious sanity check,
+     * but the timer element would have to have sub-second resolution,
+     * which would get us into portability trouble.
+     */
+    do {
+	MEVENT *follower;
+
+	merge = FALSE;
+	for (ep = runp; (next = NEXT(ep)) != eventp; ep = next)
+	    if (ep->id != INVALID_EVENT) {
+		if (next->id != INVALID_EVENT)
+		    continue;
+		follower = NEXT(next);
+		if (follower->id == INVALID_EVENT)
+		    continue;
+
+		/* merge click events forward */
+		if ((ep->bstate & BUTTON_CLICKED)
+		    && (follower->bstate & BUTTON_CLICKED)) {
+		    for (b = 1; b <= MAX_BUTTONS; ++b) {
+			if ((sp->_mouse_mask & MASK_DOUBLE_CLICK(b))
+			    && (follower->bstate & MASK_CLICK(b))) {
+			    follower->bstate &= ~MASK_CLICK(b);
+			    follower->bstate |= MASK_DOUBLE_CLICK(b);
+			    merge = TRUE;
+			}
+		    }
+		    if (merge)
+			ep->id = INVALID_EVENT;
+		}
+
+		/* merge double-click events forward */
+		if ((ep->bstate & BUTTON_DOUBLE_CLICKED)
+		    && (follower->bstate & BUTTON_CLICKED)) {
+		    for (b = 1; b <= MAX_BUTTONS; ++b) {
+			if ((sp->_mouse_mask & MASK_TRIPLE_CLICK(b))
+			    && (follower->bstate & MASK_CLICK(b))) {
+			    follower->bstate &= ~MASK_CLICK(b);
+			    follower->bstate |= MASK_TRIPLE_CLICK(b);
+			    merge = TRUE;
+			}
+		    }
+		    if (merge)
+			ep->id = INVALID_EVENT;
+		}
+	    }
+    } while
+	(merge);
+
+#ifdef TRACE
+    if (USE_TRACEF(TRACE_IEVENT)) {
+	_trace_slot(sp, "before mouse event queue compaction:");
+	_tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
+		RunParams(sp, eventp, runp),
+		runcount);
+	_nc_unlock_global(tracef);
+    }
+#endif /* TRACE */
+
+    /*
+     * Now try to throw away trailing events flagged invalid, or that
+     * don't match the current event mask.
+     */
+    for (; runcount; prev = PREV(eventp), runcount--)
+	if (prev->id == INVALID_EVENT || !(prev->bstate & sp->_mouse_mask)) {
+	    sp->_mouse_eventp = eventp = prev;
+	}
+#ifdef TRACE
+    if (USE_TRACEF(TRACE_IEVENT)) {
+	_trace_slot(sp, "after mouse event queue compaction:");
+	_tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
+		RunParams(sp, eventp, runp),
+		runcount);
+	_nc_unlock_global(tracef);
+    }
+    for (ep = runp; ep != eventp; ep = NEXT(ep))
+	if (ep->id != INVALID_EVENT)
+	    TR(MY_TRACE,
+	       ("_nc_mouse_parse: returning composite mouse event %s at slot %ld",
+		_nc_tracemouse(sp, ep),
+		(long) IndexEV(sp, ep)));
+#endif /* TRACE */
+
+    /* after all this, do we have a valid event? */
+    return (PREV(eventp)->id != INVALID_EVENT);
+}
+
+static void
+_nc_mouse_wrap(SCREEN *sp)
+/* release mouse -- called by endwin() before shellout/exit */
+{
+    TR(MY_TRACE, ("_nc_mouse_wrap() called"));
+
+    switch (sp->_mouse_type) {
+    case M_XTERM:
+	if (sp->_mouse_mask)
+	    mouse_activate(sp, FALSE);
+	break;
+#if USE_GPM_SUPPORT
+	/* GPM: pass all mouse events to next client */
+    case M_GPM:
+	if (sp->_mouse_mask)
+	    mouse_activate(sp, FALSE);
+	break;
+#endif
+#if USE_SYSMOUSE
+    case M_SYSMOUSE:
+	mouse_activate(sp, FALSE);
+	break;
+#endif
+    case M_NONE:
+	break;
+    }
+}
+
+static void
+_nc_mouse_resume(SCREEN *sp)
+/* re-connect to mouse -- called by doupdate() after shellout */
+{
+    TR(MY_TRACE, ("_nc_mouse_resume() called"));
+
+    switch (sp->_mouse_type) {
+    case M_XTERM:
+	/* xterm: re-enable reporting */
+	if (sp->_mouse_mask)
+	    mouse_activate(sp, TRUE);
+	break;
+
+#if USE_GPM_SUPPORT
+    case M_GPM:
+	/* GPM: reclaim our event set */
+	if (sp->_mouse_mask)
+	    mouse_activate(sp, TRUE);
+	break;
+#endif
+
+#if USE_SYSMOUSE
+    case M_SYSMOUSE:
+	mouse_activate(sp, TRUE);
+	break;
+#endif
+    case M_NONE:
+	break;
+    }
+}
+
+/**************************************************************************
+ *
+ * Mouse interface entry points for the API
+ *
+ **************************************************************************/
+
+static int
+_nc_getmouse(SCREEN *sp, MEVENT * aevent)
+{
+    T((T_CALLED("getmouse(%p)"), aevent));
+
+    if ((aevent != 0) && (sp != 0) && (sp->_mouse_type != M_NONE)) {
+	MEVENT *eventp = sp->_mouse_eventp;
+	/* compute the current-event pointer */
+	MEVENT *prev = PREV(eventp);
+
+	/* copy the event we find there */
+	*aevent = *prev;
+
+	TR(TRACE_IEVENT, ("getmouse: returning event %s from slot %ld",
+			  _nc_tracemouse(sp, prev),
+			  (long) IndexEV(sp, prev)));
+
+	prev->id = INVALID_EVENT;	/* so the queue slot becomes free */
+	returnCode(OK);
+    }
+    returnCode(ERR);
+}
+
+/* grab a copy of the current mouse event */
+NCURSES_EXPORT(int)
+getmouse(MEVENT * aevent)
+{
+    return _nc_getmouse(SP, aevent);
+}
+
+static int
+_nc_ungetmouse(SCREEN *sp, MEVENT * aevent)
+{
+    int result = ERR;
+
+    T((T_CALLED("ungetmouse(%p)"), aevent));
+
+    if (aevent != 0 && sp != 0) {
+	MEVENT *eventp = sp->_mouse_eventp;
+
+	/* stick the given event in the next-free slot */
+	*eventp = *aevent;
+
+	/* bump the next-free pointer into the circular list */
+	sp->_mouse_eventp = NEXT(eventp);
+
+	/* push back the notification event on the keyboard queue */
+	result = _nc_ungetch(sp, KEY_MOUSE);
+    }
+    returnCode(result);
+}
+
+/* enqueue a synthesized mouse event to be seen by the next wgetch() */
+NCURSES_EXPORT(int)
+ungetmouse(MEVENT * aevent)
+{
+    return _nc_ungetmouse(SP, aevent);
+}
+
+NCURSES_EXPORT(mmask_t)
+mousemask(mmask_t newmask, mmask_t * oldmask)
+/* set the mouse event mask */
+{
+    mmask_t result = 0;
+
+    T((T_CALLED("mousemask(%#lx,%p)"), (unsigned long) newmask, oldmask));
+
+    if (SP != 0) {
+	if (oldmask)
+	    *oldmask = SP->_mouse_mask;
+
+	if (newmask || SP->_mouse_initialized) {
+	    _nc_mouse_init(SP);
+	    if (SP->_mouse_type != M_NONE) {
+		result = newmask &
+		    (REPORT_MOUSE_POSITION
+		     | BUTTON_ALT
+		     | BUTTON_CTRL
+		     | BUTTON_SHIFT
+		     | BUTTON_PRESSED
+		     | BUTTON_RELEASED
+		     | BUTTON_CLICKED
+		     | BUTTON_DOUBLE_CLICKED
+		     | BUTTON_TRIPLE_CLICKED);
+
+		mouse_activate(SP, (bool) (result != 0));
+
+		SP->_mouse_mask = result;
+	    }
+	}
+    }
+    returnBits(result);
+}
+
+NCURSES_EXPORT(bool)
+wenclose(const WINDOW *win, int y, int x)
+/* check to see if given window encloses given screen location */
+{
+    bool result = FALSE;
+
+    T((T_CALLED("wenclose(%p,%d,%d)"), win, y, x));
+
+    if (win != 0) {
+	y -= win->_yoffset;
+	result = ((win->_begy <= y &&
+		   win->_begx <= x &&
+		   (win->_begx + win->_maxx) >= x &&
+		   (win->_begy + win->_maxy) >= y) ? TRUE : FALSE);
+    }
+    returnBool(result);
+}
+
+NCURSES_EXPORT(int)
+mouseinterval(int maxclick)
+/* set the maximum mouse interval within which to recognize a click */
+{
+    int oldval;
+
+    T((T_CALLED("mouseinterval(%d)"), maxclick));
+
+    if (SP != 0) {
+	oldval = SP->_maxclick;
+	if (maxclick >= 0)
+	    SP->_maxclick = maxclick;
+    } else {
+	oldval = DEFAULT_MAXCLICK;
+    }
+
+    returnCode(oldval);
+}
+
+/* This may be used by other routines to ask for the existence of mouse
+   support */
+NCURSES_EXPORT(int)
+_nc_has_mouse(void)
+{
+    return (SP->_mouse_type == M_NONE ? 0 : 1);
+}
+
+NCURSES_EXPORT(bool)
+wmouse_trafo(const WINDOW *win, int *pY, int *pX, bool to_screen)
+{
+    bool result = FALSE;
+
+    T((T_CALLED("wmouse_trafo(%p,%p,%p,%d)"), win, pY, pX, to_screen));
+
+    if (win && pY && pX) {
+	int y = *pY;
+	int x = *pX;
+
+	if (to_screen) {
+	    y += win->_begy + win->_yoffset;
+	    x += win->_begx;
+	    if (wenclose(win, y, x))
+		result = TRUE;
+	} else {
+	    if (wenclose(win, y, x)) {
+		y -= (win->_begy + win->_yoffset);
+		x -= win->_begx;
+		result = TRUE;
+	    }
+	}
+	if (result) {
+	    *pX = x;
+	    *pY = y;
+	}
+    }
+    returnBool(result);
+}