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lib_mouse.c

/****************************************************************************
 * Copyright (c) 1998-2002,2003 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 1996-2003                                      *
 ****************************************************************************/

/*
 * This module is intended to encapsulate ncurses's interface to pointing
 * devices.
 *
 * The first method used is xterm's internal mouse-tracking facility.
 * The second is Alessandro Rubini's GPM server.
 *
 * 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 1.68 2003/11/08 21:50:50 tom Exp $")

#include <term.h>
#include <tic.h>

#if USE_GPM_SUPPORT
#ifndef LINT                  /* don't need this for llib-lncurses */
#undef buttons                /* term.h defines this, and gpm uses it! */
#include <gpm.h>
#include <linux/keyboard.h>   /* defines KG_* macros */
#endif
#endif

#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)         ((001 << (6 * ((x) - 1))))
#define     MASK_PRESS(x)           ((002 << (6 * ((x) - 1))))
#define     MASK_CLICK(x)           ((004 << (6 * ((x) - 1))))
#define     MASK_DOUBLE_CLICK(x)    ((010 << (6 * ((x) - 1))))
#define     MASK_TRIPLE_CLICK(x)    ((020 << (6 * ((x) - 1))))
#define     MASK_RESERVED_EVENT(x)  ((040 << (6 * ((x) - 1))))

#define BUTTON_CLICKED  (BUTTON1_CLICKED  | BUTTON2_CLICKED  | BUTTON3_CLICKED)
#define BUTTON_PRESSED  (BUTTON1_PRESSED  | BUTTON2_PRESSED  | BUTTON3_PRESSED)
#define BUTTON_RELEASED (BUTTON1_RELEASED | BUTTON2_RELEASED | BUTTON3_RELEASED)

#define INVALID_EVENT   -1
#define NORMAL_EVENT    0

#if USE_GPM_SUPPORT
#ifndef LINT
static Gpm_Connect gpm_connect;
#endif
#endif

static mmask_t eventmask;     /* current event mask */

static bool _nc_mouse_parse(int);
static void _nc_mouse_resume(SCREEN *);
static void _nc_mouse_wrap(SCREEN *);

/* maintain a circular list of mouse events */

/* The definition of the circular list size (EV_MAX), is in curses.priv.h, so
 * wgetch() may refer to the size and call _nc_mouse_parse() before circular
 * list overflow.
 */
static MEVENT events[EV_MAX]; /* hold the last mouse event seen */
static MEVENT *eventp = events;     /* next free slot in event queue */

#undef  NEXT
#define NEXT(ep)  ((ep == events + EV_MAX - 1) ? events : ep + 1)

#undef  PREV
#define PREV(ep)  ((ep == events) ? events + EV_MAX - 1 : ep - 1)

#ifdef TRACE
static void
_trace_slot(const char *tag)
{
    MEVENT *ep;

    _tracef(tag);

    for (ep = events; ep < events + EV_MAX; ep++)
      _tracef("mouse event queue slot %ld = %s",
            (long) (ep - events),
            _tracemouse(ep));
}
#endif

#if USE_EMX_MOUSE

#  define TOP_ROW          0
#  define LEFT_COL         0

static int mouse_wfd;
static int mouse_thread;
static int mouse_activated;
static char mouse_buttons[] =
{0, 1, 3, 2};

#  define M_FD(sp) sp->_mouse_fd

static void
write_event(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(mouse_wfd, buf, 6, &ignore);
}

static void
mouse_server(unsigned long ignored GCC_UNUSED)
{
    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 (!mouse_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(mouev.fs & MOUSE_BN1_DOWN,
                        mouse_buttons[1], mouev.col, mouev.row);
            if ((mouev.fs ^ oldstate) & MOUSE_BN2_DOWN)
                write_event(mouev.fs & MOUSE_BN2_DOWN,
                        mouse_buttons[3], mouev.col, mouev.row);
            if ((mouev.fs ^ oldstate) & MOUSE_BN3_DOWN)
                write_event(mouev.fs & MOUSE_BN3_DOWN,
                        mouse_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);
}

static void
server_state(const int state)
{                       /* It would be nice to implement pointer-off and stop looping... */
    mouse_activated = state;
}

#endif /* USE_EMX_MOUSE */

#if USE_SYSMOUSE
static void
handle_sysmouse(int sig GCC_UNUSED)
{
    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;
    }
}
#endif

static int initialized;

static void
init_xterm_mouse(void)
{
    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%;";
}

#if !USE_EMX_MOUSE
static void
enable_xterm_mouse(int enable)
{
    putp(tparm(SP->_mouse_xtermcap, enable));
}
#endif /* !USE_EMX_MOUSE */

static void
initialize_mousetype(void)
{
    static const char *xterm_kmous = "\033[M";

    /* Try gpm first, because gpm may be configured to run in xterm */
#if USE_GPM_SUPPORT
    /* GPM does printf's without checking if stdout is a terminal */
    if (isatty(fileno(stdout))) {
      /* GPM: initialize connection to gpm server */
      gpm_connect.eventMask = GPM_DOWN | GPM_UP;
      gpm_connect.defaultMask = ~(gpm_connect.eventMask | GPM_HARD);
      gpm_connect.minMod = 0;
      gpm_connect.maxMod = ~((1 << KG_SHIFT) | (1 << KG_SHIFTL) | (1 << KG_SHIFTR));
      if (Gpm_Open(&gpm_connect, 0) >= 0) {     /* returns the file-descriptor */
          SP->_mouse_type = M_GPM;
          SP->_mouse_fd = gpm_fd;
          return;
      }
    }
#endif

    /* OS/2 VIO */
#if USE_EMX_MOUSE
    if (!mouse_thread
      && strstr(cur_term->type.term_names, "xterm") == 0
      && key_mouse) {
      int handles[2];

      if (pipe(handles) < 0) {
          perror("mouse pipe error");
          return;
      } else {
          int rc;

          if (!mouse_buttons[0]) {
            char *s = getenv("MOUSE_BUTTONS_123");

            mouse_buttons[0] = 1;
            if (s && strlen(s) >= 3) {
                mouse_buttons[1] = s[0] - '0';
                mouse_buttons[2] = s[1] - '0';
                mouse_buttons[3] = s[2] - '0';
            }
          }
          mouse_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 *) &mouse_thread,
                         mouse_server, 0, 0, 8192);
          if (rc) {
            printf("mouse thread error %d=%#x", rc, rc);
            return;
          } else {
            SP->_mouse_type = M_XTERM;
            return;
          }
      }
    }
#endif

#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;
            return;
          }
      }
    }
#endif /* USE_SYSMOUSE */

    /* we know how to recognize mouse events under "xterm" */
    if (key_mouse != 0) {
      if (!strcmp(key_mouse, xterm_kmous)) {
          init_xterm_mouse();
          return;
      }
    } else if (strstr(cur_term->type.term_names, "xterm") != 0) {
      (void) _nc_add_to_try(&(SP->_keytry), xterm_kmous, KEY_MOUSE);
      init_xterm_mouse();
      return;
    }
}

static void
_nc_mouse_init(void)
/* initialize the mouse */
{
    int i;

    if (!initialized) {
      initialized = TRUE;

      TR(MY_TRACE, ("_nc_mouse_init() called"));

      for (i = 0; i < EV_MAX; i++)
          events[i].id = INVALID_EVENT;

      initialize_mousetype();

      T(("_nc_mouse_init() set mousetype to %d", SP->_mouse_type));
    }
}

/*
 * 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)
{
    bool result = FALSE;

    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 (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 */
            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 */
          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 */
{
    bool result = FALSE;

    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.  It always does under Linux but often
       * fails to under Solaris.
       */
      for (grabbed = 0; grabbed < 3; grabbed += 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 = (prev & MASK_PRESS(n) \
                  ? REPORT_MOUSE_POSITION \
                  : MASK_PRESS(n))
#endif

      switch (kbuf[0] & 0x3) {
      case 0x0:
          PRESS_POSITION(1);
          break;

      case 0x1:
          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;
            if (!(prev & BUTTON1_PRESSED))
                eventp->bstate &= ~BUTTON1_RELEASED;
            if (!(prev & BUTTON2_PRESSED))
                eventp->bstate &= ~BUTTON2_RELEASED;
            if (!(prev & BUTTON3_PRESSED))
                eventp->bstate &= ~BUTTON3_RELEASED;
          } 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",
          _tracemouse(eventp),
          (long) (eventp - events)));

      /* bump the next-free pointer into the circular list */
      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(bool on)
{
    if (!on && !initialized)
      return;

    _nc_mouse_init();

    if (on) {

      switch (SP->_mouse_type) {
      case M_XTERM:
#if NCURSES_EXT_FUNCS
          keyok(KEY_MOUSE, on);
#endif
          TPUTS_TRACE("xterm mouse initialization");
#if USE_EMX_MOUSE
          server_state(1);
#else
          enable_xterm_mouse(1);
#endif
          break;
#if USE_GPM_SUPPORT
      case M_GPM:
          SP->_mouse_fd = gpm_fd;
          break;
#endif
#if USE_SYSMOUSE
      case M_SYSMOUSE:
          signal(SIGUSR2, handle_sysmouse);
          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");
#if USE_EMX_MOUSE
          server_state(0);
#else
          enable_xterm_mouse(0);
#endif
          break;
#if USE_GPM_SUPPORT
      case M_GPM:
          break;
#endif
#if USE_SYSMOUSE
      case M_SYSMOUSE:
          signal(SIGUSR2, SIG_IGN);
          break;
#endif
      case M_NONE:
          return;
      }
    }
    _nc_flush();
}

/**************************************************************************
 *
 * Device-independent code
 *
 **************************************************************************/

static bool
_nc_mouse_parse(int runcount)
/* parse a run of atomic mouse events into a gesture */
{
    MEVENT *ep, *runp, *next, *prev = PREV(eventp);
    int n;
    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",
          _tracemouse(prev),
          (long) (prev - events)));
      return (prev->id >= NORMAL_EVENT)
          ? ((prev->bstate & eventmask) ? TRUE : FALSE)
          : FALSE;
    }

    /* find the start of the run */
    runp = eventp;
    for (n = runcount; n > 0; n--) {
      runp = PREV(runp);
    }

#ifdef TRACE
    if (_nc_tracing & TRACE_IEVENT) {
      _trace_slot("before mouse press/release merge:");
      _tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
            (long) (runp - events),
            (long) ((eventp - events) + (EV_MAX - 1)) % EV_MAX,
            runcount);
    }
#endif /* TRACE */

    /* first pass; merge press/release pairs */
    do {
      merge = FALSE;
      for (ep = runp; (next = NEXT(ep)) != eventp; ep = next) {
          if (ep->x == next->x && ep->y == next->y
            && (ep->bstate & BUTTON_PRESSED)
            && (!(ep->bstate & BUTTON1_PRESSED)
                == !(next->bstate & BUTTON1_RELEASED))
            && (!(ep->bstate & BUTTON2_PRESSED)
                == !(next->bstate & BUTTON2_RELEASED))
            && (!(ep->bstate & BUTTON3_PRESSED)
                == !(next->bstate & BUTTON3_RELEASED))
            ) {
            if ((eventmask & BUTTON1_CLICKED)
                && (ep->bstate & BUTTON1_PRESSED)) {
                ep->bstate &= ~BUTTON1_PRESSED;
                ep->bstate |= BUTTON1_CLICKED;
                merge = TRUE;
            }
            if ((eventmask & BUTTON2_CLICKED)
                && (ep->bstate & BUTTON2_PRESSED)) {
                ep->bstate &= ~BUTTON2_PRESSED;
                ep->bstate |= BUTTON2_CLICKED;
                merge = TRUE;
            }
            if ((eventmask & BUTTON3_CLICKED)
                && (ep->bstate & BUTTON3_PRESSED)) {
                ep->bstate &= ~BUTTON3_PRESSED;
                ep->bstate |= BUTTON3_CLICKED;
                merge = TRUE;
            }
            if (merge)
                next->id = INVALID_EVENT;
          }
      }
    } while
      (merge);

#ifdef TRACE
    if (_nc_tracing & TRACE_IEVENT) {
      _trace_slot("before mouse click merge:");
      _tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
            (long) (runp - events),
            (long) ((eventp - events) + (EV_MAX - 1)) % EV_MAX,
            runcount);
    }
#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)) {
                if ((eventmask & BUTTON1_DOUBLE_CLICKED)
                  && (follower->bstate & BUTTON1_CLICKED)) {
                  follower->bstate &= ~BUTTON1_CLICKED;
                  follower->bstate |= BUTTON1_DOUBLE_CLICKED;
                  merge = TRUE;
                }
                if ((eventmask & BUTTON2_DOUBLE_CLICKED)
                  && (follower->bstate & BUTTON2_CLICKED)) {
                  follower->bstate &= ~BUTTON2_CLICKED;
                  follower->bstate |= BUTTON2_DOUBLE_CLICKED;
                  merge = TRUE;
                }
                if ((eventmask & BUTTON3_DOUBLE_CLICKED)
                  && (follower->bstate & BUTTON3_CLICKED)) {
                  follower->bstate &= ~BUTTON3_CLICKED;
                  follower->bstate |= BUTTON3_DOUBLE_CLICKED;
                  merge = TRUE;
                }
                if (merge)
                  ep->id = INVALID_EVENT;
            }

            /* merge double-click events forward */
            if ((ep->bstate &
                 (BUTTON1_DOUBLE_CLICKED
                  | BUTTON2_DOUBLE_CLICKED
                  | BUTTON3_DOUBLE_CLICKED))
                && (follower->bstate & BUTTON_CLICKED)) {
                if ((eventmask & BUTTON1_TRIPLE_CLICKED)
                  && (follower->bstate & BUTTON1_CLICKED)) {
                  follower->bstate &= ~BUTTON1_CLICKED;
                  follower->bstate |= BUTTON1_TRIPLE_CLICKED;
                  merge = TRUE;
                }
                if ((eventmask & BUTTON2_TRIPLE_CLICKED)
                  && (follower->bstate & BUTTON2_CLICKED)) {
                  follower->bstate &= ~BUTTON2_CLICKED;
                  follower->bstate |= BUTTON2_TRIPLE_CLICKED;
                  merge = TRUE;
                }
                if ((eventmask & BUTTON3_TRIPLE_CLICKED)
                  && (follower->bstate & BUTTON3_CLICKED)) {
                  follower->bstate &= ~BUTTON3_CLICKED;
                  follower->bstate |= BUTTON3_TRIPLE_CLICKED;
                  merge = TRUE;
                }
                if (merge)
                  ep->id = INVALID_EVENT;
            }
          }
    } while
      (merge);

#ifdef TRACE
    if (_nc_tracing & TRACE_IEVENT) {
      _trace_slot("before mouse event queue compaction:");
      _tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
            (long) (runp - events),
            (long) ((eventp - events) + (EV_MAX - 1)) % EV_MAX,
            runcount);
    }
#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 & eventmask)) {
          eventp = prev;
      }
#ifdef TRACE
    if (_nc_tracing & TRACE_IEVENT) {
      _trace_slot("after mouse event queue compaction:");
      _tracef("_nc_mouse_parse: run starts at %ld, ends at %ld, count %d",
            (long) (runp - events),
            (long) ((eventp - events) + (EV_MAX - 1)) % EV_MAX,
            runcount);
    }
    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",
            _tracemouse(ep),
            (long) (ep - events)));
#endif /* TRACE */

    /* after all this, do we have a valid event? */
    return (PREV(eventp)->id != INVALID_EVENT);
}

static void
_nc_mouse_wrap(SCREEN * sp GCC_UNUSED)
/* release mouse -- called by endwin() before shellout/exit */
{
    TR(MY_TRACE, ("_nc_mouse_wrap() called"));

    switch (SP->_mouse_type) {
    case M_XTERM:
      if (eventmask)
          mouse_activate(FALSE);
      break;
#if USE_GPM_SUPPORT
      /* GPM: pass all mouse events to next client */
    case M_GPM:
      break;
#endif
#if USE_SYSMOUSE
    case M_SYSMOUSE:
      mouse_activate(FALSE);
      break;
#endif
    case M_NONE:
      break;
    }
}

static void
_nc_mouse_resume(SCREEN * sp GCC_UNUSED)
/* 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 (eventmask)
          mouse_activate(TRUE);
      break;

#if USE_GPM_SUPPORT
    case M_GPM:
      /* GPM: reclaim our event set */
      break;
#endif

#if USE_SYSMOUSE
    case M_SYSMOUSE:
      mouse_activate(TRUE);
      break;
#endif
    case M_NONE:
      break;
    }
}

/**************************************************************************
 *
 * Mouse interface entry points for the API
 *
 **************************************************************************/

NCURSES_EXPORT(int)
getmouse(MEVENT * aevent)
/* grab a copy of the current mouse event */
{
    T((T_CALLED("getmouse(%p)"), aevent));

    if (aevent && (SP->_mouse_type != M_NONE)) {
      /* 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",
                    _tracemouse(prev),
                    (long) (prev - events)));

      prev->id = INVALID_EVENT;     /* so the queue slot becomes free */
      returnCode(OK);
    }
    returnCode(ERR);
}

NCURSES_EXPORT(int)
ungetmouse(MEVENT * aevent)
/* enqueue a synthesized mouse event to be seen by the next wgetch() */
{
    T((T_CALLED("ungetmouse(%p)"), aevent));

    /* stick the given event in the next-free slot */
    *eventp = *aevent;

    /* bump the next-free pointer into the circular list */
    eventp = NEXT(eventp);

    /* push back the notification event on the keyboard queue */
    returnCode(ungetch(KEY_MOUSE));
}

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)"), newmask, oldmask));

    if (oldmask)
      *oldmask = eventmask;

    if (!newmask && !initialized)
      returnBits(0);

    _nc_mouse_init();
    if (SP->_mouse_type != M_NONE) {
      eventmask = newmask &
          (REPORT_MOUSE_POSITION | BUTTON_ALT | BUTTON_CTRL | BUTTON_SHIFT
           | BUTTON_PRESSED
           | BUTTON_RELEASED
           | BUTTON_CLICKED
           | BUTTON1_DOUBLE_CLICKED | BUTTON1_TRIPLE_CLICKED
           | BUTTON2_DOUBLE_CLICKED | BUTTON2_TRIPLE_CLICKED
           | BUTTON3_DOUBLE_CLICKED | BUTTON3_TRIPLE_CLICKED);

      mouse_activate(eventmask != 0);

      result = eventmask;
    }

    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);
}

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