xselect.c 70.7 KB
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/* X Selection processing for Emacs.
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   Copyright (C) 1993, 1994, 1995, 1996, 1997, 2000 Free Software Foundation.
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This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
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/* Rewritten by jwz */

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#include <config.h>
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#include "lisp.h"
#include "xterm.h"	/* for all of the X includes */
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#include "dispextern.h"	/* frame.h seems to want this */
#include "frame.h"	/* Need this to get the X window of selected_frame */
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#include "blockinput.h"
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#include "buffer.h"
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#include "charset.h"
#include "coding.h"
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#include "process.h"
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#include "composite.h"
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#define CUT_BUFFER_SUPPORT

Lisp_Object QPRIMARY, QSECONDARY, QSTRING, QINTEGER, QCLIPBOARD, QTIMESTAMP,
  QTEXT, QDELETE, QMULTIPLE, QINCR, QEMACS_TMP, QTARGETS, QATOM, QNULL,
  QATOM_PAIR;

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Lisp_Object QCOMPOUND_TEXT;	/* This is a type of selection.  */

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#ifdef CUT_BUFFER_SUPPORT
Lisp_Object QCUT_BUFFER0, QCUT_BUFFER1, QCUT_BUFFER2, QCUT_BUFFER3,
  QCUT_BUFFER4, QCUT_BUFFER5, QCUT_BUFFER6, QCUT_BUFFER7;
#endif

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static Lisp_Object Vx_lost_selection_hooks;
static Lisp_Object Vx_sent_selection_hooks;
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/* Coding system for communicating with other X clients via cutbuffer,
   selection, and clipboard.  */
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static Lisp_Object Vselection_coding_system;
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/* Coding system for the next communicating with other X clients.  */
static Lisp_Object Vnext_selection_coding_system;

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/* If this is a smaller number than the max-request-size of the display,
   emacs will use INCR selection transfer when the selection is larger
   than this.  The max-request-size is usually around 64k, so if you want
   emacs to use incremental selection transfers when the selection is 
   smaller than that, set this.  I added this mostly for debugging the
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   incremental transfer stuff, but it might improve server performance.  */
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#define MAX_SELECTION_QUANTUM 0xFFFFFF

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#ifdef HAVE_X11R4
#define SELECTION_QUANTUM(dpy) ((XMaxRequestSize(dpy) << 2) - 100)
#else
#define SELECTION_QUANTUM(dpy) (((dpy)->max_request_size << 2) - 100)
#endif
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/* The timestamp of the last input event Emacs received from the X server.  */
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/* Defined in keyboard.c.  */
extern unsigned long last_event_timestamp;
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/* This is an association list whose elements are of the form
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     ( SELECTION-NAME SELECTION-VALUE SELECTION-TIMESTAMP FRAME)
   SELECTION-NAME is a lisp symbol, whose name is the name of an X Atom.
   SELECTION-VALUE is the value that emacs owns for that selection.
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     It may be any kind of Lisp object.
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   SELECTION-TIMESTAMP is the time at which emacs began owning this selection,
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     as a cons of two 16-bit numbers (making a 32 bit time.)
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   FRAME is the frame for which we made the selection.
   If there is an entry in this alist, then it can be assumed that Emacs owns
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    that selection.
   The only (eq) parts of this list that are visible from Lisp are the
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    selection-values.  */
static Lisp_Object Vselection_alist;
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/* This is an alist whose CARs are selection-types (whose names are the same
   as the names of X Atoms) and whose CDRs are the names of Lisp functions to
   call to convert the given Emacs selection value to a string representing 
   the given selection type.  This is for Lisp-level extension of the emacs
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   selection handling.  */
static Lisp_Object Vselection_converter_alist;
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/* If the selection owner takes too long to reply to a selection request,
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   we give up on it.  This is in milliseconds (0 = no timeout.)  */
static int x_selection_timeout;
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/* Utility functions */

static void lisp_data_to_selection_data ();
static Lisp_Object selection_data_to_lisp_data ();
static Lisp_Object x_get_window_property_as_lisp_data ();

/* This converts a Lisp symbol to a server Atom, avoiding a server 
   roundtrip whenever possible.  */

static Atom
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symbol_to_x_atom (dpyinfo, display, sym)
     struct x_display_info *dpyinfo;
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     Display *display;
     Lisp_Object sym;
{
  Atom val;
  if (NILP (sym))	    return 0;
  if (EQ (sym, QPRIMARY))   return XA_PRIMARY;
  if (EQ (sym, QSECONDARY)) return XA_SECONDARY;
  if (EQ (sym, QSTRING))    return XA_STRING;
  if (EQ (sym, QINTEGER))   return XA_INTEGER;
  if (EQ (sym, QATOM))	    return XA_ATOM;
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  if (EQ (sym, QCLIPBOARD)) return dpyinfo->Xatom_CLIPBOARD;
  if (EQ (sym, QTIMESTAMP)) return dpyinfo->Xatom_TIMESTAMP;
  if (EQ (sym, QTEXT))	    return dpyinfo->Xatom_TEXT;
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  if (EQ (sym, QCOMPOUND_TEXT)) return dpyinfo->Xatom_COMPOUND_TEXT;
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  if (EQ (sym, QDELETE))    return dpyinfo->Xatom_DELETE;
  if (EQ (sym, QMULTIPLE))  return dpyinfo->Xatom_MULTIPLE;
  if (EQ (sym, QINCR))	    return dpyinfo->Xatom_INCR;
  if (EQ (sym, QEMACS_TMP)) return dpyinfo->Xatom_EMACS_TMP;
  if (EQ (sym, QTARGETS))   return dpyinfo->Xatom_TARGETS;
  if (EQ (sym, QNULL))	    return dpyinfo->Xatom_NULL;
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#ifdef CUT_BUFFER_SUPPORT
  if (EQ (sym, QCUT_BUFFER0)) return XA_CUT_BUFFER0;
  if (EQ (sym, QCUT_BUFFER1)) return XA_CUT_BUFFER1;
  if (EQ (sym, QCUT_BUFFER2)) return XA_CUT_BUFFER2;
  if (EQ (sym, QCUT_BUFFER3)) return XA_CUT_BUFFER3;
  if (EQ (sym, QCUT_BUFFER4)) return XA_CUT_BUFFER4;
  if (EQ (sym, QCUT_BUFFER5)) return XA_CUT_BUFFER5;
  if (EQ (sym, QCUT_BUFFER6)) return XA_CUT_BUFFER6;
  if (EQ (sym, QCUT_BUFFER7)) return XA_CUT_BUFFER7;
#endif
  if (!SYMBOLP (sym)) abort ();

#if 0
  fprintf (stderr, " XInternAtom %s\n", (char *) XSYMBOL (sym)->name->data);
#endif
  BLOCK_INPUT;
  val = XInternAtom (display, (char *) XSYMBOL (sym)->name->data, False);
  UNBLOCK_INPUT;
  return val;
}


/* This converts a server Atom to a Lisp symbol, avoiding server roundtrips
   and calls to intern whenever possible.  */

static Lisp_Object
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x_atom_to_symbol (dpyinfo, display, atom)
     struct x_display_info *dpyinfo;
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     Display *display;
     Atom atom;
{
  char *str;
  Lisp_Object val;
  if (! atom) return Qnil;
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  switch (atom)
    {
    case XA_PRIMARY:
      return QPRIMARY;
    case XA_SECONDARY:
      return QSECONDARY;
    case XA_STRING:
      return QSTRING;
    case XA_INTEGER:
      return QINTEGER;
    case XA_ATOM:
      return QATOM;
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#ifdef CUT_BUFFER_SUPPORT
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    case XA_CUT_BUFFER0:
      return QCUT_BUFFER0;
    case XA_CUT_BUFFER1:
      return QCUT_BUFFER1;
    case XA_CUT_BUFFER2:
      return QCUT_BUFFER2;
    case XA_CUT_BUFFER3:
      return QCUT_BUFFER3;
    case XA_CUT_BUFFER4:
      return QCUT_BUFFER4;
    case XA_CUT_BUFFER5:
      return QCUT_BUFFER5;
    case XA_CUT_BUFFER6:
      return QCUT_BUFFER6;
    case XA_CUT_BUFFER7:
      return QCUT_BUFFER7;
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#endif
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    }

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  if (atom == dpyinfo->Xatom_CLIPBOARD)
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    return QCLIPBOARD;
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  if (atom == dpyinfo->Xatom_TIMESTAMP)
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    return QTIMESTAMP;
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  if (atom == dpyinfo->Xatom_TEXT)
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    return QTEXT;
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  if (atom == dpyinfo->Xatom_COMPOUND_TEXT)
    return QCOMPOUND_TEXT;
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  if (atom == dpyinfo->Xatom_DELETE)
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    return QDELETE;
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  if (atom == dpyinfo->Xatom_MULTIPLE)
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    return QMULTIPLE;
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  if (atom == dpyinfo->Xatom_INCR)
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    return QINCR;
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  if (atom == dpyinfo->Xatom_EMACS_TMP)
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    return QEMACS_TMP;
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  if (atom == dpyinfo->Xatom_TARGETS)
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    return QTARGETS;
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  if (atom == dpyinfo->Xatom_NULL)
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    return QNULL;
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  BLOCK_INPUT;
  str = XGetAtomName (display, atom);
  UNBLOCK_INPUT;
#if 0
  fprintf (stderr, " XGetAtomName --> %s\n", str);
#endif
  if (! str) return Qnil;
  val = intern (str);
  BLOCK_INPUT;
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  /* This was allocated by Xlib, so use XFree.  */
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  XFree (str);
  UNBLOCK_INPUT;
  return val;
}
234

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/* Do protocol to assert ourself as a selection owner.
   Update the Vselection_alist so that we can reply to later requests for 
   our selection.  */

static void
x_own_selection (selection_name, selection_value)
     Lisp_Object selection_name, selection_value;
{
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  struct frame *sf = SELECTED_FRAME ();
  Window selecting_window = FRAME_X_WINDOW (sf);
  Display *display = FRAME_X_DISPLAY (sf);
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  Time time = last_event_timestamp;
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  Atom selection_atom;
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  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (sf);
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  int count;
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  CHECK_SYMBOL (selection_name, 0);
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  selection_atom = symbol_to_x_atom (dpyinfo, display, selection_name);
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  BLOCK_INPUT;
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  count = x_catch_errors (display);
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  XSetSelectionOwner (display, selection_atom, selecting_window, time);
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  x_check_errors (display, "Can't set selection: %s");
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  x_uncatch_errors (display, count);
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  UNBLOCK_INPUT;

  /* Now update the local cache */
  {
    Lisp_Object selection_time;
    Lisp_Object selection_data;
    Lisp_Object prev_value;

    selection_time = long_to_cons ((unsigned long) time);
    selection_data = Fcons (selection_name,
			    Fcons (selection_value,
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				   Fcons (selection_time,
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					  Fcons (selected_frame, Qnil))));
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    prev_value = assq_no_quit (selection_name, Vselection_alist);

    Vselection_alist = Fcons (selection_data, Vselection_alist);

    /* If we already owned the selection, remove the old selection data.
       Perhaps we should destructively modify it instead.
       Don't use Fdelq as that may QUIT.  */
    if (!NILP (prev_value))
      {
	Lisp_Object rest;	/* we know it's not the CAR, so it's easy.  */
	for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
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	  if (EQ (prev_value, Fcar (XCDR (rest))))
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	    {
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	      XCDR (rest) = Fcdr (XCDR (rest));
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	      break;
	    }
      }
  }
}

/* Given a selection-name and desired type, look up our local copy of
   the selection value and convert it to the type.
   The value is nil or a string.
   This function is used both for remote requests
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   and for local x-get-selection-internal.
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   This calls random Lisp code, and may signal or gc.  */

static Lisp_Object
x_get_local_selection (selection_symbol, target_type)
     Lisp_Object selection_symbol, target_type;
{
  Lisp_Object local_value;
  Lisp_Object handler_fn, value, type, check;
  int count;

  local_value = assq_no_quit (selection_symbol, Vselection_alist);

  if (NILP (local_value)) return Qnil;

  /* TIMESTAMP and MULTIPLE are special cases 'cause that's easiest.  */
  if (EQ (target_type, QTIMESTAMP))
    {
      handler_fn = Qnil;
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      value = XCAR (XCDR (XCDR (local_value)));
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    }
#if 0
  else if (EQ (target_type, QDELETE))
    {
      handler_fn = Qnil;
      Fx_disown_selection_internal
	(selection_symbol,
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	 XCAR (XCDR (XCDR (local_value))));
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      value = QNULL;
    }
#endif

#if 0 /* #### MULTIPLE doesn't work yet */
  else if (CONSP (target_type)
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	   && XCAR (target_type) == QMULTIPLE)
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    {
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      Lisp_Object pairs;
      int size;
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      int i;
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      pairs = XCDR (target_type);
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      size = XVECTOR (pairs)->size;
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      /* If the target is MULTIPLE, then target_type looks like
	  (MULTIPLE . [[SELECTION1 TARGET1] [SELECTION2 TARGET2] ... ])
	 We modify the second element of each pair in the vector and
	 return it as [[SELECTION1 <value1>] [SELECTION2 <value2>] ... ]
       */
      for (i = 0; i < size; i++)
	{
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	  Lisp_Object pair;
	  pair = XVECTOR (pairs)->contents [i];
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	  XVECTOR (pair)->contents [1]
	    = x_get_local_selection (XVECTOR (pair)->contents [0],
				     XVECTOR (pair)->contents [1]);
	}
      return pairs;
    }
#endif
  else
    {
      /* Don't allow a quit within the converter.
	 When the user types C-g, he would be surprised
	 if by luck it came during a converter.  */
      count = specpdl_ptr - specpdl;
      specbind (Qinhibit_quit, Qt);

      CHECK_SYMBOL (target_type, 0);
      handler_fn = Fcdr (Fassq (target_type, Vselection_converter_alist));
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      if (!NILP (handler_fn))
	value = call3 (handler_fn,
		       selection_symbol, target_type,
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		       XCAR (XCDR (local_value)));
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      else
	value = Qnil;
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      unbind_to (count, Qnil);
    }

  /* Make sure this value is of a type that we could transmit
     to another X client.  */
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  check = value;
  if (CONSP (value)
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      && SYMBOLP (XCAR (value)))
    type = XCAR (value),
    check = XCDR (value);
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  if (STRINGP (check)
      || VECTORP (check)
      || SYMBOLP (check)
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      || INTEGERP (check)
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      || NILP (value))
    return value;
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  /* Check for a value that cons_to_long could handle.  */
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  else if (CONSP (check)
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	   && INTEGERP (XCAR (check))
	   && (INTEGERP (XCDR (check))
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	       ||
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	       (CONSP (XCDR (check))
		&& INTEGERP (XCAR (XCDR (check)))
		&& NILP (XCDR (XCDR (check))))))
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    return value;
  else
    return
      Fsignal (Qerror,
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	       Fcons (build_string ("invalid data returned by selection-conversion function"),
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		      Fcons (handler_fn, Fcons (value, Qnil))));
}

/* Subroutines of x_reply_selection_request.  */

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/* Send a SelectionNotify event to the requestor with property=None,
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   meaning we were unable to do what they wanted.  */

static void
x_decline_selection_request (event)
     struct input_event *event;
{
  XSelectionEvent reply;
  reply.type = SelectionNotify;
  reply.display = SELECTION_EVENT_DISPLAY (event);
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  reply.requestor = SELECTION_EVENT_REQUESTOR (event);
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  reply.selection = SELECTION_EVENT_SELECTION (event);
  reply.time = SELECTION_EVENT_TIME (event);
  reply.target = SELECTION_EVENT_TARGET (event);
  reply.property = None;

  BLOCK_INPUT;
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  XSendEvent (reply.display, reply.requestor, False, 0L,
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	      (XEvent *) &reply);
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  XFlush (reply.display);
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  UNBLOCK_INPUT;
}

/* This is the selection request currently being processed.
   It is set to zero when the request is fully processed.  */
static struct input_event *x_selection_current_request;

/* Used as an unwind-protect clause so that, if a selection-converter signals
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   an error, we tell the requester that we were unable to do what they wanted
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   before we throw to top-level or go into the debugger or whatever.  */

static Lisp_Object
x_selection_request_lisp_error (ignore)
     Lisp_Object ignore;
{
  if (x_selection_current_request != 0)
    x_decline_selection_request (x_selection_current_request);
  return Qnil;
}

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/* This stuff is so that INCR selections are reentrant (that is, so we can
   be servicing multiple INCR selection requests simultaneously.)  I haven't
   actually tested that yet.  */

/* Keep a list of the property changes that are awaited.  */

struct prop_location
{
  int identifier;
  Display *display;
  Window window;
  Atom property;
  int desired_state;
  int arrived;
  struct prop_location *next;
};

static struct prop_location *expect_property_change ();
static void wait_for_property_change ();
static void unexpect_property_change ();
static int waiting_for_other_props_on_window ();

static int prop_location_identifier;

static Lisp_Object property_change_reply;

static struct prop_location *property_change_reply_object;

static struct prop_location *property_change_wait_list;
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static Lisp_Object
queue_selection_requests_unwind (frame)
     Lisp_Object frame;
{
  FRAME_PTR f = XFRAME (frame);

  if (! NILP (frame))
    x_stop_queuing_selection_requests (FRAME_X_DISPLAY (f));
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  return Qnil;
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}

/* Return some frame whose display info is DPYINFO.
   Return nil if there is none.  */

static Lisp_Object
some_frame_on_display (dpyinfo)
     struct x_display_info *dpyinfo;
{
  Lisp_Object list, frame;

  FOR_EACH_FRAME (list, frame)
    {
      if (FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
	return frame;
    }

  return Qnil;
}
505

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/* Send the reply to a selection request event EVENT.
   TYPE is the type of selection data requested.
   DATA and SIZE describe the data to send, already converted.
   FORMAT is the unit-size (in bits) of the data to be transmitted.  */

static void
x_reply_selection_request (event, format, data, size, type)
     struct input_event *event;
     int format, size;
     unsigned char *data;
     Atom type;
{
  XSelectionEvent reply;
  Display *display = SELECTION_EVENT_DISPLAY (event);
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  Window window = SELECTION_EVENT_REQUESTOR (event);
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  int bytes_remaining;
  int format_bytes = format/8;
  int max_bytes = SELECTION_QUANTUM (display);
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  struct x_display_info *dpyinfo = x_display_info_for_display (display);
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  int count;
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  if (max_bytes > MAX_SELECTION_QUANTUM)
    max_bytes = MAX_SELECTION_QUANTUM;

  reply.type = SelectionNotify;
  reply.display = display;
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  reply.requestor = window;
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  reply.selection = SELECTION_EVENT_SELECTION (event);
  reply.time = SELECTION_EVENT_TIME (event);
  reply.target = SELECTION_EVENT_TARGET (event);
  reply.property = SELECTION_EVENT_PROPERTY (event);
  if (reply.property == None)
    reply.property = reply.target;

  /* #### XChangeProperty can generate BadAlloc, and we must handle it! */
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  BLOCK_INPUT;
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  count = x_catch_errors (display);
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  /* Store the data on the requested property.
     If the selection is large, only store the first N bytes of it.
   */
  bytes_remaining = size * format_bytes;
  if (bytes_remaining <= max_bytes)
    {
      /* Send all the data at once, with minimal handshaking.  */
#if 0
      fprintf (stderr,"\nStoring all %d\n", bytes_remaining);
#endif
      XChangeProperty (display, window, reply.property, type, format,
		       PropModeReplace, data, size);
      /* At this point, the selection was successfully stored; ack it.  */
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      XSendEvent (display, window, False, 0L, (XEvent *) &reply);
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    }
  else
    {
      /* Send an INCR selection.  */
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      struct prop_location *wait_object;
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      int had_errors;
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      Lisp_Object frame;
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      frame = some_frame_on_display (dpyinfo);

      /* If the display no longer has frames, we can't expect
	 to get many more selection requests from it, so don't
	 bother trying to queue them.  */
      if (!NILP (frame))
	{
	  x_start_queuing_selection_requests (display);

	  record_unwind_protect (queue_selection_requests_unwind,
				 frame);
	}
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      if (x_window_to_frame (dpyinfo, window)) /* #### debug */
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	error ("Attempt to transfer an INCR to ourself!");
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#if 0
      fprintf (stderr, "\nINCR %d\n", bytes_remaining);
#endif
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      wait_object = expect_property_change (display, window, reply.property,
					    PropertyDelete);
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      XChangeProperty (display, window, reply.property, dpyinfo->Xatom_INCR,
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		       32, PropModeReplace,
		       (unsigned char *) &bytes_remaining, 1);
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      XSelectInput (display, window, PropertyChangeMask);
      /* Tell 'em the INCR data is there...  */
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      XSendEvent (display, window, False, 0L, (XEvent *) &reply);
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      XFlush (display);
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      had_errors = x_had_errors_p (display);
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      UNBLOCK_INPUT;
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      /* First, wait for the requester to ack by deleting the property.
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	 This can run random lisp code (process handlers) or signal.  */
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      if (! had_errors)
	wait_for_property_change (wait_object);
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      while (bytes_remaining)
	{
	  int i = ((bytes_remaining < max_bytes)
		   ? bytes_remaining
		   : max_bytes);
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	  BLOCK_INPUT;

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	  wait_object
	    = expect_property_change (display, window, reply.property,
				      PropertyDelete);
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#if 0
	  fprintf (stderr,"  INCR adding %d\n", i);
#endif
	  /* Append the next chunk of data to the property.  */
	  XChangeProperty (display, window, reply.property, type, format,
			   PropModeAppend, data, i / format_bytes);
	  bytes_remaining -= i;
	  data += i;
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	  XFlush (display);
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	  had_errors = x_had_errors_p (display);
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	  UNBLOCK_INPUT;
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	  if (had_errors)
	    break;

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	  /* Now wait for the requester to ack this chunk by deleting the
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	     property.	 This can run random lisp code or signal.
	   */
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	  wait_for_property_change (wait_object);
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	}
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      /* Now write a zero-length chunk to the property to tell the requester
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	 that we're done.  */
#if 0
      fprintf (stderr,"  INCR done\n");
#endif
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      BLOCK_INPUT;
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      if (! waiting_for_other_props_on_window (display, window))
	XSelectInput (display, window, 0L);

      XChangeProperty (display, window, reply.property, type, format,
		       PropModeReplace, data, 0);
    }
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  XFlush (display);
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  x_uncatch_errors (display, count);
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  UNBLOCK_INPUT;
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}

/* Handle a SelectionRequest event EVENT.
   This is called from keyboard.c when such an event is found in the queue.  */

void
x_handle_selection_request (event)
     struct input_event *event;
{
  struct gcpro gcpro1, gcpro2, gcpro3;
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  Lisp_Object local_selection_data;
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  Lisp_Object selection_symbol;
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  Lisp_Object target_symbol;
  Lisp_Object converted_selection;
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  Time local_selection_time;
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  Lisp_Object successful_p;
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  int count;
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  struct x_display_info *dpyinfo
    = x_display_info_for_display (SELECTION_EVENT_DISPLAY (event));
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  local_selection_data = Qnil;
  target_symbol = Qnil;
  converted_selection = Qnil;
  successful_p = Qnil;

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  GCPRO3 (local_selection_data, converted_selection, target_symbol);

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  selection_symbol = x_atom_to_symbol (dpyinfo,
				       SELECTION_EVENT_DISPLAY (event),
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				       SELECTION_EVENT_SELECTION (event));

  local_selection_data = assq_no_quit (selection_symbol, Vselection_alist);

  if (NILP (local_selection_data))
    {
      /* Someone asked for the selection, but we don't have it any more.
       */
      x_decline_selection_request (event);
      goto DONE;
    }

  local_selection_time = (Time)
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    cons_to_long (XCAR (XCDR (XCDR (local_selection_data))));
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  if (SELECTION_EVENT_TIME (event) != CurrentTime
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      && local_selection_time > SELECTION_EVENT_TIME (event))
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    {
      /* Someone asked for the selection, and we have one, but not the one
	 they're looking for.
       */
      x_decline_selection_request (event);
      goto DONE;
    }

  count = specpdl_ptr - specpdl;
  x_selection_current_request = event;
  record_unwind_protect (x_selection_request_lisp_error, Qnil);

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  target_symbol = x_atom_to_symbol (dpyinfo, SELECTION_EVENT_DISPLAY (event),
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				    SELECTION_EVENT_TARGET (event));

#if 0 /* #### MULTIPLE doesn't work yet */
  if (EQ (target_symbol, QMULTIPLE))
    target_symbol = fetch_multiple_target (event);
#endif
  
  /* Convert lisp objects back into binary data */
  
  converted_selection
    = x_get_local_selection (selection_symbol, target_symbol);
  
  if (! NILP (converted_selection))
    {
      unsigned char *data;
      unsigned int size;
      int format;
      Atom type;
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      int nofree;

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      lisp_data_to_selection_data (SELECTION_EVENT_DISPLAY (event),
				   converted_selection,
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				   &data, &type, &size, &format, &nofree);
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      x_reply_selection_request (event, format, data, size, type);
      successful_p = Qt;

      /* Indicate we have successfully processed this event.  */
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      x_selection_current_request = 0;
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      /* Use xfree, not XFree, because lisp_data_to_selection_data
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	 calls xmalloc itself.  */
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      if (!nofree)
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	xfree (data);
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    }
  unbind_to (count, Qnil);

 DONE:

  UNGCPRO;

  /* Let random lisp code notice that the selection has been asked for.  */
  {
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    Lisp_Object rest;
    rest = Vx_sent_selection_hooks;
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    if (!EQ (rest, Qunbound))
      for (; CONSP (rest); rest = Fcdr (rest))
	call3 (Fcar (rest), selection_symbol, target_symbol, successful_p);
  }
}

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/* Handle a SelectionClear event EVENT, which indicates that some
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   client cleared out our previously asserted selection.
   This is called from keyboard.c when such an event is found in the queue.  */

void
x_handle_selection_clear (event)
     struct input_event *event;
{
  Display *display = SELECTION_EVENT_DISPLAY (event);
  Atom selection = SELECTION_EVENT_SELECTION (event);
  Time changed_owner_time = SELECTION_EVENT_TIME (event);
  
  Lisp_Object selection_symbol, local_selection_data;
  Time local_selection_time;
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  struct x_display_info *dpyinfo = x_display_info_for_display (display);
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  struct x_display_info *t_dpyinfo;

  /* If the new selection owner is also Emacs,
     don't clear the new selection.  */
  BLOCK_INPUT;
  /* Check each display on the same terminal,
     to see if this Emacs job now owns the selection
     through that display.  */
  for (t_dpyinfo = x_display_list; t_dpyinfo; t_dpyinfo = t_dpyinfo->next)
    if (t_dpyinfo->kboard == dpyinfo->kboard)
      {
	Window owner_window
	  = XGetSelectionOwner (t_dpyinfo->display, selection);
	if (x_window_to_frame (t_dpyinfo, owner_window) != 0)
	  {
	    UNBLOCK_INPUT;
	    return;
	  }
      }
  UNBLOCK_INPUT;
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  selection_symbol = x_atom_to_symbol (dpyinfo, display, selection);
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  local_selection_data = assq_no_quit (selection_symbol, Vselection_alist);

  /* Well, we already believe that we don't own it, so that's just fine.  */
  if (NILP (local_selection_data)) return;

  local_selection_time = (Time)
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    cons_to_long (XCAR (XCDR (XCDR (local_selection_data))));
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  /* This SelectionClear is for a selection that we no longer own, so we can
     disregard it.  (That is, we have reasserted the selection since this
     request was generated.)  */

  if (changed_owner_time != CurrentTime
      && local_selection_time > changed_owner_time)
    return;

  /* Otherwise, we're really honest and truly being told to drop it.
     Don't use Fdelq as that may QUIT;.  */

  if (EQ (local_selection_data, Fcar (Vselection_alist)))
    Vselection_alist = Fcdr (Vselection_alist);
  else
    {
      Lisp_Object rest;
      for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
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	if (EQ (local_selection_data, Fcar (XCDR (rest))))
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	  {
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	    XCDR (rest) = Fcdr (XCDR (rest));
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	    break;
	  }
    }

  /* Let random lisp code notice that the selection has been stolen.  */

  {
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    Lisp_Object rest;
    rest = Vx_lost_selection_hooks;
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    if (!EQ (rest, Qunbound))
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      {
	for (; CONSP (rest); rest = Fcdr (rest))
	  call1 (Fcar (rest), selection_symbol);
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	prepare_menu_bars ();
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	redisplay_preserve_echo_area ();
      }
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  }
}

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/* Clear all selections that were made from frame F.
   We do this when about to delete a frame.  */

void
x_clear_frame_selections (f)
     FRAME_PTR f;
{
  Lisp_Object frame;
  Lisp_Object rest;

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  XSETFRAME (frame, f);
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  /* Otherwise, we're really honest and truly being told to drop it.
     Don't use Fdelq as that may QUIT;.  */

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  /* Delete elements from the beginning of Vselection_alist.  */
  while (!NILP (Vselection_alist)
	 && EQ (frame, Fcar (Fcdr (Fcdr (Fcdr (Fcar (Vselection_alist)))))))
    {
      /* Let random Lisp code notice that the selection has been stolen.  */
      Lisp_Object hooks, selection_symbol;

      hooks = Vx_lost_selection_hooks;
      selection_symbol = Fcar (Fcar (Vselection_alist));

      if (!EQ (hooks, Qunbound))
	{
	  for (; CONSP (hooks); hooks = Fcdr (hooks))
	    call1 (Fcar (hooks), selection_symbol);
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#if 0 /* This can crash when deleting a frame
	 from x_connection_closed.  Anyway, it seems unnecessary;
	 something else should cause a redisplay.  */
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	  redisplay_preserve_echo_area ();
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#endif
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	}

      Vselection_alist = Fcdr (Vselection_alist);
    }

  /* Delete elements after the beginning of Vselection_alist.  */
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  for (rest = Vselection_alist; !NILP (rest); rest = Fcdr (rest))
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    if (EQ (frame, Fcar (Fcdr (Fcdr (Fcdr (Fcar (XCDR (rest))))))))
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      {
	/* Let random Lisp code notice that the selection has been stolen.  */
	Lisp_Object hooks, selection_symbol;

	hooks = Vx_lost_selection_hooks;
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	selection_symbol = Fcar (Fcar (XCDR (rest)));
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	if (!EQ (hooks, Qunbound))
	  {
	    for (; CONSP (hooks); hooks = Fcdr (hooks))
	      call1 (Fcar (hooks), selection_symbol);
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#if 0 /* See above */
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	    redisplay_preserve_echo_area ();
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#endif
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	  }
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	XCDR (rest) = Fcdr (XCDR (rest));
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	break;
      }
}
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/* Nonzero if any properties for DISPLAY and WINDOW
   are on the list of what we are waiting for.  */

static int
waiting_for_other_props_on_window (display, window)
     Display *display;
     Window window;
{
  struct prop_location *rest = property_change_wait_list;
  while (rest)
    if (rest->display == display && rest->window == window)
      return 1;
    else
      rest = rest->next;
  return 0;
}

/* Add an entry to the list of property changes we are waiting for.
   DISPLAY, WINDOW, PROPERTY, STATE describe what we will wait for.
   The return value is a number that uniquely identifies
   this awaited property change.  */

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static struct prop_location *
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expect_property_change (display, window, property, state)
     Display *display;
     Window window;
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     Atom property;
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     int state;
{
  struct prop_location *pl
    = (struct prop_location *) xmalloc (sizeof (struct prop_location));
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  pl->identifier = ++prop_location_identifier;
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  pl->display = display;
  pl->window = window;
  pl->property = property;
  pl->desired_state = state;
  pl->next = property_change_wait_list;
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  pl->arrived = 0;
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  property_change_wait_list = pl;
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  return pl;
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}

/* Delete an entry from the list of property changes we are waiting for.
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   IDENTIFIER is the number that uniquely identifies the entry.  */
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static void
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unexpect_property_change (location)
     struct prop_location *location;
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{
  struct prop_location *prev = 0, *rest = property_change_wait_list;
  while (rest)
    {
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      if (rest == location)
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	{
	  if (prev)
	    prev->next = rest->next;
	  else
	    property_change_wait_list = rest->next;
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	  xfree (rest);
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	  return;
	}
      prev = rest;
      rest = rest->next;
    }
}

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/* Remove the property change expectation element for IDENTIFIER.  */

static Lisp_Object
wait_for_property_change_unwind (identifierval)
     Lisp_Object identifierval;
{
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  unexpect_property_change ((struct prop_location *)
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			    (XFASTINT (XCAR (identifierval)) << 16
			     | XFASTINT (XCDR (identifierval))));
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  return Qnil;
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}

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/* Actually wait for a property change.
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   IDENTIFIER should be the value that expect_property_change returned.  */
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static void
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wait_for_property_change (location)
     struct prop_location *location;
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{
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  int secs, usecs;
  int count = specpdl_ptr - specpdl;
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  Lisp_Object tem;

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  tem = Fcons (Qnil, Qnil);
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  XSETFASTINT (XCAR (tem), (EMACS_UINT)location >> 16);
  XSETFASTINT (XCDR (tem), (EMACS_UINT)location & 0xffff);
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  /* Make sure to do unexpect_property_change if we quit or err.  */
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  record_unwind_protect (wait_for_property_change_unwind, tem);
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  XCAR (property_change_reply) = Qnil;
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  property_change_reply_object = location;
  /* If the event we are waiting for arrives beyond here, it will set
     property_change_reply, because property_change_reply_object says so.  */
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  if (! location->arrived)
    {
      secs = x_selection_timeout / 1000;
      usecs = (x_selection_timeout % 1000) * 1000;
      wait_reading_process_input (secs, usecs, property_change_reply, 0);

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      if (NILP (XCAR (property_change_reply)))
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	error ("Timed out waiting for property-notify event");
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    }
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  unbind_to (count, Qnil);
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}

/* Called from XTread_socket in response to a PropertyNotify event.  */

void
x_handle_property_notify (event)
     XPropertyEvent *event;
{
  struct prop_location *prev = 0, *rest = property_change_wait_list;
  while (rest)
    {
      if (rest->property == event->atom
	  && rest->window == event->window
	  && rest->display == event->display
	  && rest->desired_state == event->state)
	{
#if 0
	  fprintf (stderr, "Saw expected prop-%s on %s\n",
		   (event->state == PropertyDelete ? "delete" : "change"),
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		   (char *) XSYMBOL (x_atom_to_symbol (dpyinfo, event->display,
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						       event->atom))
		   ->name->data);
#endif

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	  rest->arrived = 1;

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	  /* If this is the one wait_for_property_change is waiting for,
	     tell it to wake up.  */
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	  if (rest == property_change_reply_object)
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	    XCAR (property_change_reply) = Qt;
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	  if (prev)
	    prev->next = rest->next;
	  else
	    property_change_wait_list = rest->next;
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	  xfree (rest);
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	  return;
	}
      prev = rest;
      rest = rest->next;
    }
#if 0
  fprintf (stderr, "Saw UNexpected prop-%s on %s\n",
	   (event->state == PropertyDelete ? "delete" : "change"),
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	   (char *) XSYMBOL (x_atom_to_symbol (dpyinfo,
					       event->display, event->atom))
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	   ->name->data);
#endif
}



#if 0 /* #### MULTIPLE doesn't work yet */

static Lisp_Object
fetch_multiple_target (event)
     XSelectionRequestEvent *event;
{
  Display *display = event->display;
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  Window window = event->requestor;
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  Atom target = event->target;
  Atom selection_atom = event->selection;
  int result;

  return
    Fcons (QMULTIPLE,
	   x_get_window_property_as_lisp_data (display, window, target,
					       QMULTIPLE, selection_atom));
}

static Lisp_Object
copy_multiple_data (obj)
     Lisp_Object obj;
{
  Lisp_Object vec;
  int i;
  int size;
  if (CONSP (obj))
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    return Fcons (XCAR (obj), copy_multiple_data (XCDR (obj)));
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  CHECK_VECTOR (obj, 0);
  vec = Fmake_vector (size = XVECTOR (obj)->size, Qnil);
  for (i = 0; i < size; i++)
    {
      Lisp_Object vec2 = XVECTOR (obj)->contents [i];
      CHECK_VECTOR (vec2, 0);
      if (XVECTOR (vec2)->size != 2)
	/* ??? Confusing error message */
	Fsignal (Qerror, Fcons (build_string ("vectors must be of length 2"),
				Fcons (vec2, Qnil)));
      XVECTOR (vec)->contents [i] = Fmake_vector (2, Qnil);
      XVECTOR (XVECTOR (vec)->contents [i])->contents [0]
	= XVECTOR (vec2)->contents [0];
      XVECTOR (XVECTOR (vec)->contents [i])->contents [1]
	= XVECTOR (vec2)->contents [1];
    }
  return vec;
}

#endif


/* Variables for communication with x_handle_selection_notify.  */
static Atom reading_which_selection;
static Lisp_Object reading_selection_reply;
static Window reading_selection_window;

/* Do protocol to read selection-data from the server.
   Converts this to Lisp data and returns it.  */

static Lisp_Object
x_get_foreign_selection (selection_symbol, target_type)
     Lisp_Object selection_symbol, target_type;
{