Merged from emacs--devo--0

Patches applied:

 * emacs@sv.gnu.org/emacs--devo--0--patch-744
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-745
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-746
   Merge from emacs--rel--22

 * emacs@sv.gnu.org/emacs--devo--0--patch-747
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-748
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-749
   Merge from gnus--rel--5.10

 * emacs@sv.gnu.org/emacs--devo--0--patch-750
   Merge from emacs--rel--22

 * emacs@sv.gnu.org/emacs--devo--0--patch-751
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-752
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-753
   Merge from emacs--rel--22

 * emacs@sv.gnu.org/emacs--devo--0--patch-754
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-755
   Merge from emacs--rel--22

 * emacs@sv.gnu.org/emacs--devo--0--patch-756
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-757
   Update from CVS: lisp/textmodes/sgml-mode.el: Revert last change.

 * emacs@sv.gnu.org/emacs--devo--0--patch-758
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-759
   Merge from emacs--rel--22

 * emacs@sv.gnu.org/emacs--devo--0--patch-760
   Update from CVS

 * emacs@sv.gnu.org/emacs--devo--0--patch-761
   Update from CVS

 * emacs@sv.gnu.org/emacs--rel--22--patch-14
   Update from CVS

 * emacs@sv.gnu.org/emacs--rel--22--patch-15
   Update from CVS

 * emacs@sv.gnu.org/emacs--rel--22--patch-16
   Update from CVS: src/xterm.c (XTread_socket): Revert last change.

 * emacs@sv.gnu.org/emacs--rel--22--patch-17
   Update from CVS

 * emacs@sv.gnu.org/emacs--rel--22--patch-18
   Update from CVS

 * emacs@sv.gnu.org/emacs--rel--22--patch-19
   Update from CVS

 * emacs@sv.gnu.org/emacs--rel--22--patch-20
   Update from CVS

 * emacs@sv.gnu.org/emacs--rel--22--patch-21
   Update from CVS

 * emacs@sv.gnu.org/gnus--rel--5.10--patch-221
   Update from CVS

Revision: emacs@sv.gnu.org/emacs--multi-tty--0--patch-12
Creator:  Karoly Lorentey <karoly@lorentey.hu>

15 files changed, 1086 insertions, 70 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 59a0af5e2c8..67f6bd282c2 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,103 @@
+2007-05-20  Jan Dj,Ad(Brv  <jan.h.d@swipnet.se>
+
+        * Makefile.in: Move GPM check outside HAVE_X_WINDOWS.
+
+2007-05-20  Nick Roberts  <nickrob@snap.net.nz>
+
+        * config.in, keyboard.c, Makefile.in, sysdep.c, term.c,
+        * termhooks.h: Use HAVE_GPM instead of HAVE_GPM_H.
+
+2007-05-20  Nick Roberts  <nickrob@snap.net.nz>
+
+        * keyboard.c (make_lispy_event): Make case GPM_CLICK_EVENT
+        conditional on [HAVE_GPM_H].
+
+2007-05-19  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+        * syntax.c (skip_chars): Update syntax-table only after we checked that
+        the new location is valid.
+
+2007-05-19  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+        * macterm.c (x_calc_absolute_position): Add BLOCK_INPUT around
+        mac_get_window_bounds.
+
+2007-05-20  Nick Roberts  <nickrob@snap.net.nz>
+
+        * Makefile.in (LIBGPM): Allow it to be set from configure.
+        If set then link Emacs with it.
+
+        * config.in: Regenerate.
+
+        * lisp.h (add_gpm_wait_descriptor, delete_gpm_wait_descriptor):
+        New externs.
+
+        * termhooks.h [HAVE_GPM_H] (enum event_kind): Add GPM_CLICK_EVENT.
+        Include gpm.h.
+        (handle_one_term_event, term_gpm) New externs.
+
+        * sysdep.c [HAVE_GPM_H] (init_sys_modes): Make gpm_fd nonblocking
+        and allow it to be interrupted by SIGIO.
+
+        * process.c (gpm_wait_mask, max_gpm_desc): New variables.
+        (wait_reading_process_output): Wait on gpm_fd too.
+        (add_gpm_wait_descriptor, delete_gpm_wait_descriptor)): New functions.
+        (add_gpm_wait_descriptor_called_flag): New variable.
+        (delete_keyboard_wait_descriptor): Check gpm_wait_mask.
+
+        * keyboard.c [HAVE_GPM_H] (Qmouse_fixup_help_message)
+        (make_lispy_movement, tracking_off, Ftrack_mouse, some_mouse_moved)
+        (show_help_echo, readable_events, kbd_buffer_get_event, init_keyboard):
+        Extend HAVE_MOUSE ifdefs to HAVE_GPM_H.
+        (make_lispy_event): Add case GPM_CLICK_EVENT.
+        (read_avail_input): Handle mouse input.
+
+        * term.c (write_glyphs_with_face): New function.
+        [HAVE_GPM_H]: Include buffer.h, sys/fcntl.h.
+        (mouse_face_beg_row, mouse_face_beg_col, mouse_face_end_row)
+        (mouse_face_end_col, mouse_face_past_end, mouse_face_window)
+        (mouse_face_face_id, term_gpm, pos_x, pos_y)
+        (last_mouse_x, last_mouse_y): New variables.
+        (term_show_mouse_face, term_clear_mouse_face, fast_find_position)
+        (term_mouse_highlight, term_mouse_movement, term_mouse_position)
+        (term_mouse_click, handle_one_term_event, Fterm_open_connection)
+        (Fterm_close_connection): New functions.
+        (term_init): Initialise mouse_face_window.
+
+2007-05-19  Chong Yidong  <cyd@stupidchicken.com>
+
+        * xdisp.c (redisplay_window): If first window line is a
+        continuation line, recompute the new window start instead of
+        recentering.
+
+2007-05-18  Glenn Morris  <rgm@gnu.org>
+
+        * m/alpha.h (ORDINARY_LINK): No longer define on OpenBSD.
+        Suggested by Alfred M. Szmidt <ams@gnu.org>.
+
+2007-05-17  Glenn Morris  <rgm@gnu.org>
+
+        * m/macppc.h (ORDINARY_LINK): No longer define on OpenBSD.
+
+2007-05-16  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+        * macterm.c [USE_CARBON_EVENTS] (mac_convert_event_ref): Also convert
+        dead key repeat and up events.
+
+2007-05-14  Chong Yidong  <cyd@stupidchicken.com>
+
+        * image.c (pbm_load): Check image size for monochrome pbm.
+
+2007-05-13  Chong Yidong  <cyd@stupidchicken.com>
+
+        * xterm.c (XTread_socket): Revert last change.
+
+2007-05-12  Chong Yidong  <cyd@stupidchicken.com>
+
+        * image.c (pbm_load): Correctly check image size for greyscale pbm.
+
+        * xterm.c (XTread_socket): Yet Another Uncaught X Error Crash (YAUXEC).
+
 2007-05-07  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * editfns.c (Ftranspose_regions): Yet another int/Lisp_Object mixup (YAILOM)
diff --git a/src/Makefile.in b/src/Makefile.in
index 31fc7b5c23e..c8db387328d 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -457,6 +457,15 @@ LIBX= $(LIBXMENU) LD_SWITCH_X_SITE -lX10 LIBX10_MACHINE LIBX10_SYSTEM
 #else /* not HAVE_X_WINDOWS */
 #endif /* not HAVE_X_WINDOWS */
 
+#if HAVE_GPM
+#ifndef LIBGPM
+#define LIBGPM -lgpm
+#endif /* not defined LIBGPM */
+#else /* not HAVE_GPM */
+#define LIBGPM
+#endif /* not HAVE_GPM */
+
+
 LIBSOUND= @LIBSOUND@
 CFLAGS_SOUND= @CFLAGS_SOUND@
 
@@ -939,7 +948,7 @@ SOME_MACHINE_LISP = ${dotdot}/lisp/mouse.elc \
    Note that SunOS needs -lm to come before -lc; otherwise, you get
    duplicated symbols.  If the standard libraries were compiled
    with GCC, we might need gnulib again after them.  */
-LIBES = $(LOADLIBES) $(LIBS) $(LIBX) $(LIBSOUND) \
+LIBES = $(LOADLIBES) $(LIBS) $(LIBX) $(LIBSOUND) LIBGPM \
    LIBS_SYSTEM LIBS_MACHINE LIBS_TERMCAP \
    LIBS_DEBUG $(GETLOADAVG_LIBS) $(GNULIB_VAR) LIB_MATH LIB_STANDARD \
    $(GNULIB_VAR)
diff --git a/src/config.in b/src/config.in
index 71b4af0c839..6d945d4bfdc 100644
--- a/src/config.in
+++ b/src/config.in
@@ -231,6 +231,9 @@ Boston, MA 02110-1301, USA.  */
 /* Define to 1 if you have the ungif library (-lungif). */
 #undef HAVE_GIF
 
+/* Define to 1 if you have the gpm library (-lgpm). */
+#undef HAVE_GPM
+
 /* Define to 1 if you have the `grantpt' function. */
 #undef HAVE_GRANTPT
 
diff --git a/src/image.c b/src/image.c
index 198ffaf4651..5243778526e 100644
--- a/src/image.c
+++ b/src/image.c
@@ -5732,7 +5732,17 @@ pbm_load (f, img)
             if (raw_p)
               {
                 if ((x & 7) == 0)
-                  c = *p++;
+                  {
+                    if (p >= end)
+                      {
+                        x_destroy_x_image (ximg);
+                        x_clear_image (f, img);
+                        image_error ("Invalid image size in image `%s'",
+                                     img->spec, Qnil);
+                        goto error;
+                      }
+                    c = *p++;
+                  }
                 g = c & 0x80;
                 c <<= 1;
               }
@@ -5744,9 +5754,13 @@ pbm_load (f, img)
     }
   else
     {
-      if (raw_p && (p + 3 * height * width > end))
+      if (raw_p
+          && ((type == PBM_GRAY)
+              ? (p + height * width > end)
+              : (p + 3 * height * width > end)))
         {
           x_destroy_x_image (ximg);
+          x_clear_image (f, img);
           image_error ("Invalid image size in image `%s'",
                        img->spec, Qnil);
           goto error;
diff --git a/src/keyboard.c b/src/keyboard.c
index 50c1d5a43b8..4658fdcca51 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -508,7 +508,7 @@ Lisp_Object Qmake_frame_visible;
 Lisp_Object Qselect_window;
 Lisp_Object Qhelp_echo;
 
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
 Lisp_Object Qmouse_fixup_help_message;
 #endif
 
@@ -661,7 +661,7 @@ static Lisp_Object read_char_x_menu_prompt ();
 static Lisp_Object read_char_minibuf_menu_prompt P_ ((int, int,
                                                       Lisp_Object *));
 static Lisp_Object make_lispy_event P_ ((struct input_event *));
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
 static Lisp_Object make_lispy_movement P_ ((struct frame *, Lisp_Object,
                                             enum scroll_bar_part,
                                             Lisp_Object, Lisp_Object,
@@ -1466,7 +1466,7 @@ DEFUN ("abort-recursive-edit", Fabort_recursive_edit, Sabort_recursive_edit, 0,
   return Qnil;
 }
 
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
 
 /* Restore mouse tracking enablement.  See Ftrack_mouse for the only use
    of this function.  */
@@ -1542,7 +1542,7 @@ some_mouse_moved ()
   return 0;
 }
 
-#endif  /* HAVE_MOUSE */
+#endif  /* HAVE_MOUSE || HAVE_GPM */
 
 /* This is the actual command reading loop,
    sans error-handling encapsulation.  */
@@ -2476,7 +2476,7 @@ show_help_echo (help, window, object, pos, ok_to_overwrite_keystroke_echo)
         return;
     }
 
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
   if (!noninteractive && STRINGP (help))
     {
       /* The mouse-fixup-help-message Lisp function can call
@@ -3753,7 +3753,7 @@ readable_events (flags)
         return 1;
     }
 
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
   if (!(flags & READABLE_EVENTS_IGNORE_SQUEEZABLES)
       && !NILP (do_mouse_tracking) && some_mouse_moved ())
     return 1;
@@ -4103,7 +4103,7 @@ kbd_buffer_get_event (kbp, used_mouse_menu, end_time)
     {
       if (kbd_fetch_ptr != kbd_store_ptr)
         break;
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
       if (!NILP (do_mouse_tracking) && some_mouse_moved ())
         break;
 #endif
@@ -4125,7 +4125,7 @@ kbd_buffer_get_event (kbp, used_mouse_menu, end_time)
 #endif /* SIGIO */
       if (kbd_fetch_ptr != kbd_store_ptr)
         break;
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
       if (!NILP (do_mouse_tracking) && some_mouse_moved ())
         break;
 #endif
@@ -4361,7 +4361,7 @@ kbd_buffer_get_event (kbp, used_mouse_menu, end_time)
             }
         }
     }
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
   /* Try generating a mouse motion event.  */
   else if (!NILP (do_mouse_tracking) && some_mouse_moved ())
     {
@@ -4406,7 +4406,7 @@ kbd_buffer_get_event (kbp, used_mouse_menu, end_time)
       if (!NILP (x) && NILP (obj))
         obj = make_lispy_movement (f, bar_window, part, x, y, time);
     }
-#endif  /* HAVE_MOUSE */
+#endif  /* HAVE_MOUSE || HAVE GPM */
   else
     /* We were promised by the above while loop that there was
        something for us to read!  */
@@ -6123,6 +6123,66 @@ make_lispy_event (event)
       }
 #endif
 
+#ifdef HAVE_GPM
+    case GPM_CLICK_EVENT:
+      {
+        FRAME_PTR f = XFRAME (event->frame_or_window);
+        Lisp_Object head, position;
+        Lisp_Object *start_pos_ptr;
+        Lisp_Object start_pos;
+        int button = event->code;
+
+        if (button >= ASIZE (button_down_location))
+          {
+            button_down_location = larger_vector (button_down_location,
+                                                  button + 1, Qnil);
+            mouse_syms = larger_vector (mouse_syms, button + 1, Qnil);
+          }
+
+        start_pos_ptr = &AREF (button_down_location, button);
+        start_pos = *start_pos_ptr;
+
+        position = make_lispy_position (f, &event->x, &event->y,
+                                            event->timestamp);
+
+        if (event->modifiers & down_modifier)
+          *start_pos_ptr = Fcopy_alist (position);
+        else if (event->modifiers & (up_modifier | drag_modifier))
+          {
+            if (!CONSP (start_pos))
+              return Qnil;
+            event->modifiers &= ~up_modifier;
+          }
+
+        head = modify_event_symbol (button,
+                                    event->modifiers,
+                                    Qmouse_click, Vlispy_mouse_stem,
+                                    NULL,
+                                    &mouse_syms,
+                                    XVECTOR (mouse_syms)->size);
+
+        if (event->modifiers & drag_modifier)
+          return Fcons (head,
+                        Fcons (start_pos,
+                               Fcons (position,
+                                      Qnil)));
+        else if (event->modifiers & double_modifier)
+          return Fcons (head,
+                        Fcons (position,
+                               Fcons (make_number (2),
+                                      Qnil)));
+        else if (event->modifiers & triple_modifier)
+          return Fcons (head,
+                        Fcons (position,
+                               Fcons (make_number (3),
+                                      Qnil)));
+        else
+          return Fcons (head,
+                        Fcons (position,
+                               Qnil));
+       }
+#endif /* HAVE_GPM */
+
       /* The 'kind' field of the event is something we don't recognize.  */
     default:
       abort ();
@@ -7057,7 +7117,27 @@ tty_read_avail_input (struct terminal *terminal,
   if (! tty->input)
     return 0;                   /* The terminal is suspended. */
 
-  /* Determine how many characters we should *try* to read.  */
+#ifdef HAVE_GPM
+  if (term_gpm && gpm_tty == tty->terminal->id)
+  {
+      Gpm_Event event;
+      struct input_event hold_quit;
+      int gpm;
+
+      EVENT_INIT (hold_quit);
+      hold_quit.kind = NO_EVENT;
+
+      while (gpm = Gpm_GetEvent (&event), gpm == 1) {
+          nread += handle_one_term_event (tty, &event, &hold_quit);
+      }
+      if (hold_quit.kind != NO_EVENT)
+          kbd_buffer_store_event (&hold_quit);
+      if (nread)
+          return nread;
+  }
+#endif /* HAVE_GPM */
+
+/* Determine how many characters we should *try* to read.  */
 #ifdef FIONREAD
   /* Find out how much input is available.  */
   if (ioctl (fileno (tty->input), FIONREAD, &n_to_read) < 0)
@@ -11440,7 +11520,7 @@ init_keyboard ()
   recent_keys_index = 0;
   kbd_fetch_ptr = kbd_buffer;
   kbd_store_ptr = kbd_buffer;
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
   do_mouse_tracking = Qnil;
 #endif
   input_pending = 0;
@@ -11636,7 +11716,7 @@ syms_of_keyboard ()
   Qmenu_bar = intern ("menu-bar");
   staticpro (&Qmenu_bar);
 
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
   Qmouse_fixup_help_message = intern ("mouse-fixup-help-message");
   staticpro (&Qmouse_fixup_help_message);
 #endif
@@ -11768,7 +11848,7 @@ syms_of_keyboard ()
   defsubr (&Sread_key_sequence);
   defsubr (&Sread_key_sequence_vector);
   defsubr (&Srecursive_edit);
-#ifdef HAVE_MOUSE
+#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
   defsubr (&Strack_mouse);
 #endif
   defsubr (&Sinput_pending_p);
diff --git a/src/lisp.h b/src/lisp.h
index 4ae55c5519e..82036f3030e 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -3101,6 +3101,8 @@ extern int wait_reading_process_output P_ ((int, int, int, int,
                                             int));
 extern void add_keyboard_wait_descriptor P_ ((int));
 extern void delete_keyboard_wait_descriptor P_ ((int));
+extern void add_gpm_wait_descriptor P_ ((int));
+extern void delete_gpm_wait_descriptor P_ ((int));
 extern void close_process_descs P_ ((void));
 extern void init_process P_ ((void));
 extern void syms_of_process P_ ((void));
diff --git a/src/m/alpha.h b/src/m/alpha.h
index 6a9f09ed0bd..3b29a8ee7be 100644
--- a/src/m/alpha.h
+++ b/src/m/alpha.h
@@ -99,10 +99,6 @@ NOTE-END
 # endif
 #endif
 
-#if defined(__OpenBSD__)
-#define ORDINARY_LINK
-#endif
-
 #ifdef __ELF__
 #undef UNEXEC
 #define UNEXEC unexelf.o
diff --git a/src/m/macppc.h b/src/m/macppc.h
index 117d7a11dc4..26994575edd 100644
--- a/src/m/macppc.h
+++ b/src/m/macppc.h
@@ -66,10 +66,6 @@ Boston, MA 02110-1301, USA.  */
 
 /* #define NO_SOCK_SIGIO */
 
-#if defined(__OpenBSD__)
-#define ORDINARY_LINK
-#endif
-
 #define UNEXEC unexelf.o
 
 #define NO_TERMIO
diff --git a/src/macterm.c b/src/macterm.c
index b48ffb47fdb..e31fba134f5 100644
--- a/src/macterm.c
+++ b/src/macterm.c
@@ -6079,7 +6079,9 @@ x_calc_absolute_position (f)
 
   /* Find the offsets of the outside upper-left corner of
      the inner window, with respect to the outer window.  */
+  BLOCK_INPUT;
   mac_get_window_bounds (f, &inner, &outer);
+  UNBLOCK_INPUT;
 
   width_diff = (outer.right - outer.left) - (inner.right - inner.left);
   height_diff = (outer.bottom - outer.top) - (inner.bottom - inner.top);
@@ -9159,15 +9161,16 @@ mac_get_mouse_btn (EventRef ref)
 
 /* Normally, ConvertEventRefToEventRecord will correctly handle all
    events.  However the click of the mouse wheel is not converted to a
-   mouseDown or mouseUp event.  Likewise for dead key down events.
-   This calls ConvertEventRef, but then checks to see if it is a mouse
-   up/down, or a dead key down carbon event that has not been
+   mouseDown or mouseUp event.  Likewise for dead key events.  This
+   calls ConvertEventRefToEventRecord, but then checks to see if it is
+   a mouse up/down, or a dead key Carbon event that has not been
    converted, and if so, converts it by hand (to be picked up in the
    XTread_socket loop).  */
 static Boolean mac_convert_event_ref (EventRef eventRef, EventRecord *eventRec)
 {
   OSStatus err;
   Boolean result = ConvertEventRefToEventRecord (eventRef, eventRec);
+  EventKind action;
 
   if (result)
     return result;
@@ -9196,6 +9199,14 @@ static Boolean mac_convert_event_ref (EventRef eventRef, EventRecord *eventRec)
       switch (GetEventKind (eventRef))
         {
         case kEventRawKeyDown:
+          action = keyDown;
+          goto keystroke_common;
+        case kEventRawKeyRepeat:
+          action = autoKey;
+          goto keystroke_common;
+        case kEventRawKeyUp:
+          action = keyUp;
+        keystroke_common:
           {
             unsigned char char_codes;
             UInt32 key_code;
@@ -9209,7 +9220,7 @@ static Boolean mac_convert_event_ref (EventRef eventRef, EventRecord *eventRec)
                                        NULL, &key_code);
             if (err == noErr)
               {
-                eventRec->what = keyDown;
+                eventRec->what = action;
                 eventRec->message = char_codes | ((key_code & 0xff) << 8);
                 result = 1;
               }
diff --git a/src/process.c b/src/process.c
index bd12f3e1a68..9a7cf29963f 100644
--- a/src/process.c
+++ b/src/process.c
@@ -336,6 +336,10 @@ static SELECT_TYPE non_keyboard_wait_mask;
 
 static SELECT_TYPE non_process_wait_mask;
 
+/* Mask for the gpm mouse input descriptor.  */
+
+static SELECT_TYPE gpm_wait_mask;
+
 #ifdef NON_BLOCKING_CONNECT
 /* Mask of bits indicating the descriptors that we wait for connect to
    complete on.  Once they complete, they are removed from this mask
@@ -357,6 +361,9 @@ static int max_process_desc;
 /* The largest descriptor currently in use for keyboard input.  */
 static int max_keyboard_desc;
 
+/* The largest descriptor currently in use for gpm mouse input.  */
+static int max_gpm_desc;
+
 /* Nonzero means delete a process right away if it exits.  */
 static int delete_exited_processes;
 
@@ -4451,7 +4458,8 @@ wait_reading_process_output (time_limit, microsecs, read_kbd, do_display,
           IF_NON_BLOCKING_CONNECT (Ctemp = connect_wait_mask);
 
           EMACS_SET_SECS_USECS (timeout, 0, 0);
-          if ((select (max (max_process_desc, max_keyboard_desc) + 1,
+          if ((select (max (max (max_process_desc, max_keyboard_desc),
+                              max_gpm_desc) + 1,
                        &Atemp,
 #ifdef NON_BLOCKING_CONNECT
                        (num_pending_connects > 0 ? &Ctemp : (SELECT_TYPE *)0),
@@ -4596,7 +4604,8 @@ wait_reading_process_output (time_limit, microsecs, read_kbd, do_display,
             }
 #endif
 
-          nfds = select (max (max_process_desc, max_keyboard_desc) + 1,
+          nfds = select (max (max (max_process_desc, max_keyboard_desc),
+                              max_gpm_desc) + 1,
                          &Available,
 #ifdef NON_BLOCKING_CONNECT
                          (check_connect ? &Connecting : (SELECT_TYPE *)0),
@@ -6975,6 +6984,21 @@ add_keyboard_wait_descriptor (desc)
     max_keyboard_desc = desc;
 }
 
+static int add_gpm_wait_descriptor_called_flag;
+
+void
+add_gpm_wait_descriptor (desc)
+     int desc;
+{
+  if (! add_gpm_wait_descriptor_called_flag)
+    FD_CLR (0, &input_wait_mask);
+  add_gpm_wait_descriptor_called_flag = 1;
+  FD_SET (desc, &input_wait_mask);
+  FD_SET (desc, &gpm_wait_mask);
+  if (desc > max_gpm_desc)
+    max_gpm_desc = desc;
+}
+
 /* From now on, do not expect DESC to give keyboard input.  */
 
 void
@@ -6990,10 +7014,29 @@ delete_keyboard_wait_descriptor (desc)
   if (desc == max_keyboard_desc)
     for (fd = 0; fd < lim; fd++)
       if (FD_ISSET (fd, &input_wait_mask)
-          && !FD_ISSET (fd, &non_keyboard_wait_mask))
+          && !FD_ISSET (fd, &non_keyboard_wait_mask)
+          && !FD_ISSET (fd, &gpm_wait_mask))
         max_keyboard_desc = fd;
 }
 
+void
+delete_gpm_wait_descriptor (desc)
+     int desc;
+{
+  int fd;
+  int lim = max_gpm_desc;
+
+  FD_CLR (desc, &input_wait_mask);
+  FD_CLR (desc, &non_process_wait_mask);
+
+  if (desc == max_gpm_desc)
+    for (fd = 0; fd < lim; fd++)
+      if (FD_ISSET (fd, &input_wait_mask)
+          && !FD_ISSET (fd, &non_keyboard_wait_mask)
+          && !FD_ISSET (fd, &non_process_wait_mask))
+        max_gpm_desc = fd;
+}
+
 /* Return nonzero if *MASK has a bit set
    that corresponds to one of the keyboard input descriptors.  */
 
diff --git a/src/syntax.c b/src/syntax.c
index a9e6dda81fe..acb5d37825c 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -1669,10 +1669,10 @@ skip_chars (forwardp, syntaxp, string, lim, handle_iso_classes)
                       p = GPT_ADDR;
                       stop = endp;
                     }
+                  UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1);
                   if (! fastmap[(int) SYNTAX (p[-1])])
                     break;
                   p--, pos--;
-                  UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1);
                 }
           }
       }
diff --git a/src/sysdep.c b/src/sysdep.c
index bbaa09fbf27..ba55d2361bb 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -1747,6 +1747,14 @@ init_sys_modes (tty_out)
         fcntl (fileno (tty_out->input), F_GETOWN, 0);
       fcntl (fileno (tty_out->input), F_SETOWN, getpid ());
       init_sigio (fileno (tty_out->input));
+#ifdef HAVE_GPM
+      if (term_gpm)
+        {
+          fcntl (gpm_fd, F_SETOWN, getpid ());
+          fcntl (gpm_fd, F_SETFL, O_NONBLOCK);
+          init_sigio (gpm_fd);
+        }
+#endif /* HAVE_GPM */
     }
 #endif /* F_GETOWN */
 #endif /* F_SETOWN_BUG */
diff --git a/src/term.c b/src/term.c
index 53727a975ea..1d8e885ade9 100644
--- a/src/term.c
+++ b/src/term.c
@@ -171,6 +171,9 @@ static int system_uses_terminfo;
 char *tparam ();
 
 extern char *tgetstr ();
+
+static void term_clear_mouse_face ();
+static void term_mouse_highlight (struct frame *f, int x, int y);
 
 
 #ifdef WINDOWSNT
@@ -184,6 +187,35 @@ extern char *tgetstr ();
 #define FRAME_TERMCAP_P(_f_) 0
 #endif /* WINDOWSNT */
 
+#ifdef HAVE_GPM
+#include <sys/fcntl.h>
+#include "buffer.h"
+
+/* Nonzero means mouse is enabled on Linux console.  */
+int term_gpm = 0;
+
+/* The id of the terminal device for which we have gpm support.  */
+int gpm_tty;
+
+/* These variables describe the range of text currently shown in its
+   mouse-face, together with the window they apply to.  As long as
+   the mouse stays within this range, we need not redraw anything on
+   its account.  Rows and columns are glyph matrix positions in
+   MOUSE_FACE_WINDOW.  */
+static int mouse_face_beg_row, mouse_face_beg_col;
+static int mouse_face_end_row, mouse_face_end_col;
+static int mouse_face_past_end;
+static Lisp_Object mouse_face_window;
+static int mouse_face_face_id;
+
+/* FRAME and X, Y position of mouse when last checked for
+   highlighting.  X and Y can be negative or out of range for the frame.  */
+struct frame *mouse_face_mouse_frame;
+int mouse_face_mouse_x, mouse_face_mouse_y;
+
+static int pos_x, pos_y;
+static int last_mouse_x, last_mouse_y;
+#endif /* HAVE_GPM */
 
 /* Ring the bell on a tty. */
 
@@ -715,6 +747,66 @@ tty_write_glyphs (struct frame *f, struct glyph *string, int len)
   cmcheckmagic (tty);
 }
 
+static void
+tty_write_glyphs_with_face (f, string, len, face_id)
+     register struct frame *f;
+     register struct glyph *string;
+     register int len, face_id;
+{
+  unsigned char *conversion_buffer;
+  struct coding_system *coding;
+
+  struct tty_display_info *tty = FRAME_TTY (f);
+
+  tty_turn_off_insert (tty);
+  tty_hide_cursor (tty);
+
+  /* Don't dare write in last column of bottom line, if Auto-Wrap,
+     since that would scroll the whole frame on some terminals.  */
+
+  if (AutoWrap (tty)
+      && curY (tty) + 1 == FRAME_LINES (f)
+      && (curX (tty) + len) == FRAME_COLS (f))
+    len --;
+  if (len <= 0)
+    return;
+
+  cmplus (tty, len);
+
+  /* If terminal_coding does any conversion, use it, otherwise use
+     safe_terminal_coding.  We can't use CODING_REQUIRE_ENCODING here
+     because it always return 1 if the member src_multibyte is 1.  */
+  coding = (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_ENCODING_MASK
+            ? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
+  /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
+     the tail.  */
+  coding->mode &= ~CODING_MODE_LAST_BLOCK;
+
+  /* Turn appearance modes of the face.  */
+  tty_highlight_if_desired (tty);
+  turn_on_face (f, face_id);
+
+  coding->mode |= CODING_MODE_LAST_BLOCK;
+  conversion_buffer = encode_terminal_code (string, len, coding);
+  if (coding->produced > 0)
+    {
+      BLOCK_INPUT;
+      fwrite (conversion_buffer, 1, coding->produced, tty->output);
+      if (ferror (tty->output))
+        clearerr (tty->output);
+      if (tty->termscript)
+        fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
+      UNBLOCK_INPUT;
+    }
+
+  /* Turn appearance modes off.  */
+  turn_off_face (f, face_id);
+  tty_turn_off_highlight (tty);
+
+  cmcheckmagic (tty);
+}
+
+
 /* An implementation of insert_glyphs for termcap frames. */
 
 static void
@@ -2248,6 +2340,663 @@ the currently selected frame. */)
 
 
 /***********************************************************************
+                               Mouse
+ ***********************************************************************/
+
+#ifdef HAVE_GPM
+static void
+term_show_mouse_face (enum draw_glyphs_face draw)
+{
+  struct window *w = XWINDOW (mouse_face_window);
+  int save_x, save_y;
+  int i, j;
+
+  struct frame *f = XFRAME (w->frame);
+  struct tty_display_info *tty = FRAME_TTY (f);
+
+  if (/* If window is in the process of being destroyed, don't bother
+         to do anything.  */
+      w->current_matrix != NULL
+      /* Recognize when we are called to operate on rows that don't exist
+         anymore.  This can happen when a window is split.  */
+      && mouse_face_end_row < w->current_matrix->nrows)
+    {
+      /* write_glyphs writes at cursor position, so we need to
+         temporarily move cursor coordinates to the beginning of
+         the highlight region.  */
+      
+      /* Save current cursor co-ordinates */
+      save_y = curY (tty);
+      save_x = curX (tty);
+
+      /* Note that mouse_face_beg_row etc. are window relative.  */
+      for (i = mouse_face_beg_row; i <= mouse_face_end_row; i++)
+        {
+          int start_hpos, end_hpos, nglyphs;
+          struct glyph_row *row = MATRIX_ROW (w->current_matrix, i);
+
+          /* Don't do anything if row doesn't have valid contents.  */
+          if (!row->enabled_p)
+            continue;
+
+          /* For all but the first row, the highlight starts at column 0.  */
+          if (i == mouse_face_beg_row)
+            start_hpos = mouse_face_beg_col;
+          else
+            start_hpos = 0;
+
+          if (i == mouse_face_end_row)
+            end_hpos = mouse_face_end_col;
+          else
+            {
+              end_hpos = row->used[TEXT_AREA];
+              if (draw == DRAW_NORMAL_TEXT)
+                row->fill_line_p = 1; /* Clear to end of line */
+            }
+
+          if (end_hpos <= start_hpos)
+            continue;
+          /* Record that some glyphs of this row are displayed in
+             mouse-face.  */
+          row->mouse_face_p = draw > 0;
+
+          nglyphs = end_hpos - start_hpos;
+
+          if (end_hpos >= row->used[TEXT_AREA])
+            nglyphs = row->used[TEXT_AREA] - start_hpos;
+
+          pos_y = row->y + WINDOW_TOP_EDGE_Y (w);
+          pos_x = row->used[LEFT_MARGIN_AREA] + start_hpos
+            + WINDOW_LEFT_EDGE_X (w);
+          
+          cursor_to (f, pos_y, pos_x);
+
+          if (draw == DRAW_MOUSE_FACE)
+            {
+              tty_write_glyphs_with_face (f, row->glyphs[TEXT_AREA] + start_hpos,
+                                      nglyphs, mouse_face_face_id);
+            }
+          else /* draw == DRAW_NORMAL_TEXT */
+            write_glyphs (f, row->glyphs[TEXT_AREA] + start_hpos, nglyphs);
+        }
+      cursor_to (f, save_y, save_x);
+    }
+}
+
+static void
+term_clear_mouse_face ()
+{
+  if (!NILP (mouse_face_window))
+    term_show_mouse_face (DRAW_NORMAL_TEXT);
+
+  mouse_face_beg_row = mouse_face_beg_col = -1;
+  mouse_face_end_row = mouse_face_end_col = -1;
+  mouse_face_window = Qnil;
+}
+
+/* Find the glyph matrix position of buffer position POS in window W.
+   *HPOS and *VPOS are set to the positions found.  W's current glyphs
+   must be up to date.  If POS is above window start return (0, 0).
+   If POS is after end of W, return end of last line in W.
+   - taken from msdos.c */
+static int
+fast_find_position (struct window *w, int pos, int *hpos, int *vpos)
+{
+  int i, lastcol, line_start_position, maybe_next_line_p = 0;
+  int yb = window_text_bottom_y (w);
+  struct glyph_row *row = MATRIX_ROW (w->current_matrix, 0), *best_row = row;
+
+  while (row->y < yb)
+    {
+      if (row->used[TEXT_AREA])
+        line_start_position = row->glyphs[TEXT_AREA]->charpos;
+      else
+        line_start_position = 0;
+
+      if (line_start_position > pos)
+        break;
+      /* If the position sought is the end of the buffer,
+         don't include the blank lines at the bottom of the window.  */
+      else if (line_start_position == pos
+               && pos == BUF_ZV (XBUFFER (w->buffer)))
+        {
+          maybe_next_line_p = 1;
+          break;
+        }
+      else if (line_start_position > 0)
+        best_row = row;
+
+      /* Don't overstep the last matrix row, lest we get into the
+         never-never land... */
+      if (row->y + 1 >= yb)
+        break;
+
+      ++row;
+    }
+
+  /* Find the right column within BEST_ROW.  */
+  lastcol = 0;
+  row = best_row;
+  for (i = 0; i < row->used[TEXT_AREA]; i++)
+    {
+      struct glyph *glyph = row->glyphs[TEXT_AREA] + i;
+      int charpos;
+
+      charpos = glyph->charpos;
+      if (charpos == pos)
+        {
+          *hpos = i;
+          *vpos = row->y;
+          return 1;
+        }
+      else if (charpos > pos)
+        break;
+      else if (charpos > 0)
+        lastcol = i;
+    }
+
+  /* If we're looking for the end of the buffer,
+     and we didn't find it in the line we scanned,
+     use the start of the following line.  */
+  if (maybe_next_line_p)
+    {
+      ++row;
+      lastcol = 0;
+    }
+
+  *vpos = row->y;
+  *hpos = lastcol + 1;
+  return 0;
+}
+
+static void
+term_mouse_highlight (struct frame *f, int x, int y)
+{
+  enum window_part part;
+  Lisp_Object window;
+  struct window *w;
+  struct buffer *b;
+
+  if (NILP (Vmouse_highlight)
+      || !f->glyphs_initialized_p)
+    return;
+
+  mouse_face_mouse_x = x;
+  mouse_face_mouse_y = y;
+  mouse_face_mouse_frame = f;
+
+  /* Which window is that in?  */
+  window = window_from_coordinates (f, x, y, &part, &x, &y, 0);
+
+  /* Not on a window -> return.  */
+  if (!WINDOWP (window))
+    return;
+
+  if (!EQ (window, mouse_face_window))
+    term_clear_mouse_face ();
+
+  w = XWINDOW (window);
+
+  /* Are we in a window whose display is up to date?
+     And verify the buffer's text has not changed.  */
+  b = XBUFFER (w->buffer);
+  if (part == ON_TEXT
+      && EQ (w->window_end_valid, w->buffer)
+      && XFASTINT (w->last_modified) == BUF_MODIFF (b)
+      && XFASTINT (w->last_overlay_modified) == BUF_OVERLAY_MODIFF (b))
+    {
+      int pos, i, nrows = w->current_matrix->nrows;
+      struct glyph_row *row;
+      struct glyph *glyph;
+
+      /* Find the glyph under X/Y.  */
+      glyph = NULL;
+      if (y >= 0 && y < nrows)
+        {
+          row = MATRIX_ROW (w->current_matrix, y);
+          /* Give up if some row before the one we are looking for is
+             not enabled.  */
+          for (i = 0; i <= y; i++)
+            if (!MATRIX_ROW (w->current_matrix, i)->enabled_p)
+              break;
+          if (i > y  /* all rows upto and including the one at Y are enabled */
+              && row->displays_text_p
+              && x <  window_box_width (w, TEXT_AREA))
+            {
+              glyph = row->glyphs[TEXT_AREA];
+              if (x >= row->used[TEXT_AREA])
+                glyph = NULL;
+              else
+                {
+                  glyph += x;
+                  if (!BUFFERP (glyph->object))
+                    glyph = NULL;
+                }
+            }
+        }
+
+      /* Clear mouse face if X/Y not over text.  */
+      if (glyph == NULL)
+        {
+          term_clear_mouse_face ();
+          return;
+        }
+
+      if (!BUFFERP (glyph->object))
+        abort ();
+      pos = glyph->charpos;
+
+      /* Check for mouse-face.  */
+      {
+        extern Lisp_Object Qmouse_face;
+        Lisp_Object mouse_face, overlay, position, *overlay_vec;
+        int noverlays, obegv, ozv;;
+        struct buffer *obuf;
+
+        /* If we get an out-of-range value, return now; avoid an error.  */
+        if (pos > BUF_Z (b))
+          return;
+
+        /* Make the window's buffer temporarily current for
+           overlays_at and compute_char_face.  */
+        obuf = current_buffer;
+        current_buffer = b;
+        obegv = BEGV;
+        ozv = ZV;
+        BEGV = BEG;
+        ZV = Z;
+
+        /* Is this char mouse-active?  */
+        XSETINT (position, pos);
+
+        /* Put all the overlays we want in a vector in overlay_vec.  */
+        GET_OVERLAYS_AT (pos, overlay_vec, noverlays, NULL, 0);
+        /* Sort overlays into increasing priority order.  */
+        noverlays = sort_overlays (overlay_vec, noverlays, w);
+
+        /* Check mouse-face highlighting.  */
+        if (!(EQ (window, mouse_face_window)
+              && y >= mouse_face_beg_row
+              && y <= mouse_face_end_row
+              && (y > mouse_face_beg_row
+                  || x >= mouse_face_beg_col)
+              && (y < mouse_face_end_row
+                  || x < mouse_face_end_col
+                  || mouse_face_past_end)))
+          {
+            /* Clear the display of the old active region, if any.  */
+            term_clear_mouse_face ();
+
+            /* Find the highest priority overlay that has a mouse-face
+               property.  */
+            overlay = Qnil;
+            for (i = noverlays - 1; i >= 0; --i)
+              {
+                mouse_face = Foverlay_get (overlay_vec[i], Qmouse_face);
+                if (!NILP (mouse_face))
+                  {
+                    overlay = overlay_vec[i];
+                    break;
+                  }
+              }
+
+            /* If no overlay applies, get a text property.  */
+            if (NILP (overlay))
+              mouse_face = Fget_text_property (position, Qmouse_face,
+                                               w->buffer);
+
+            /* Handle the overlay case.  */
+            if (!NILP (overlay))
+              {
+                /* Find the range of text around this char that
+                   should be active.  */
+                Lisp_Object before, after;
+                int ignore;
+
+
+                before = Foverlay_start (overlay);
+                after = Foverlay_end (overlay);
+                /* Record this as the current active region.  */
+                fast_find_position (w, XFASTINT (before),
+                                    &mouse_face_beg_col,
+                                    &mouse_face_beg_row);
+
+                mouse_face_past_end
+                  = !fast_find_position (w, XFASTINT (after),
+                                         &mouse_face_end_col,
+                                         &mouse_face_end_row);
+                mouse_face_window = window;
+
+                mouse_face_face_id
+                  = face_at_buffer_position (w, pos, 0, 0,
+                                             &ignore, pos + 1, 1);
+
+                /* Display it as active.  */
+                term_show_mouse_face (DRAW_MOUSE_FACE);
+              }
+            /* Handle the text property case.  */
+            else if (!NILP (mouse_face))
+              {
+                /* Find the range of text around this char that
+                   should be active.  */
+                Lisp_Object before, after, beginning, end;
+                int ignore;
+
+                beginning = Fmarker_position (w->start);
+                XSETINT (end, (BUF_Z (b) - XFASTINT (w->window_end_pos)));
+                before
+                  = Fprevious_single_property_change (make_number (pos + 1),
+                                                      Qmouse_face,
+                                                      w->buffer, beginning);
+                after
+                  = Fnext_single_property_change (position, Qmouse_face,
+                                                  w->buffer, end);
+
+                /* Record this as the current active region.  */
+                fast_find_position (w, XFASTINT (before),
+                                    &mouse_face_beg_col,
+                                    &mouse_face_beg_row);
+                mouse_face_past_end
+                  = !fast_find_position (w, XFASTINT (after),
+                                         &mouse_face_end_col,
+                                         &mouse_face_end_row);
+                mouse_face_window = window;
+
+                mouse_face_face_id
+                  = face_at_buffer_position (w, pos, 0, 0,
+                                             &ignore, pos + 1, 1);
+
+                /* Display it as active.  */
+                term_show_mouse_face (DRAW_MOUSE_FACE);
+              }
+          }
+
+        /* Look for a `help-echo' property.  */
+        {
+          Lisp_Object help;
+          extern Lisp_Object Qhelp_echo;
+
+          /* Check overlays first.  */
+          help = Qnil;
+          for (i = noverlays - 1; i >= 0 && NILP (help); --i)
+            {
+              overlay = overlay_vec[i];
+              help = Foverlay_get (overlay, Qhelp_echo);
+            }
+
+          if (!NILP (help))
+            {
+              help_echo_string = help;
+              help_echo_window = window;
+              help_echo_object = overlay;
+              help_echo_pos = pos;
+            }
+          /* Try text properties.  */
+          else if (NILP (help)
+                   && ((STRINGP (glyph->object)
+                        && glyph->charpos >= 0
+                        && glyph->charpos < SCHARS (glyph->object))
+                       || (BUFFERP (glyph->object)
+                           && glyph->charpos >= BEGV
+                           && glyph->charpos < ZV)))
+            {
+              help = Fget_text_property (make_number (glyph->charpos),
+                                         Qhelp_echo, glyph->object);
+              if (!NILP (help))
+                {
+                  help_echo_string = help;
+                  help_echo_window = window;
+                  help_echo_object = glyph->object;
+                  help_echo_pos = glyph->charpos;
+                }
+            }
+        }
+
+        BEGV = obegv;
+        ZV = ozv;
+        current_buffer = obuf;
+      }
+    }
+}
+
+static int
+term_mouse_movement (FRAME_PTR frame, Gpm_Event *event)
+{
+  /* Has the mouse moved off the glyph it was on at the last sighting?  */
+  if (event->x != last_mouse_x || event->y != last_mouse_y)
+    {
+      frame->mouse_moved = 1;
+      term_mouse_highlight (frame, event->x - 1, event->y - 1);
+      /* Remember which glyph we're now on.  */
+      last_mouse_x = event->x;
+      last_mouse_y = event->y;
+      return 1;
+    }
+  return 0;
+}
+
+/* Return the current position of the mouse.
+
+   Set *f to the frame the mouse is in, or zero if the mouse is in no
+   Emacs frame.  If it is set to zero, all the other arguments are
+   garbage.
+
+   Set *bar_window to Qnil, and *x and *y to the column and
+   row of the character cell the mouse is over.
+
+   Set *time to the time the mouse was at the returned position.
+
+   This should clear mouse_moved until the next motion
+   event arrives.
+
+   NOT CURRENTLY INVOKED: see mouse_position_hook below.  */
+static void
+term_mouse_position (FRAME_PTR *fp, int insist, Lisp_Object *bar_window,
+                     enum scroll_bar_part *part, Lisp_Object *x,
+                     Lisp_Object *y, unsigned long *time)
+{
+  Gpm_Event event;
+  struct timeval now;
+  int i;
+
+  BLOCK_INPUT;
+
+  *fp = SELECTED_FRAME ();
+
+  *bar_window = Qnil;
+  *part = 0;
+
+  i = Gpm_GetSnapshot (&event);
+
+  XSETINT (*x, event.x);
+  XSETINT (*y, event.y);
+  gettimeofday(&now, 0);
+  *time = (now.tv_sec * 1000) + (now.tv_usec / 1000);
+
+  UNBLOCK_INPUT;
+}
+
+/* Prepare a mouse-event in *RESULT for placement in the input queue.
+
+   If the event is a button press, then note that we have grabbed
+   the mouse.  */
+
+static Lisp_Object
+term_mouse_click (struct input_event *result, Gpm_Event *event,
+                  struct frame *f)
+{
+  struct timeval now;
+  int i, j;
+
+  result->kind = GPM_CLICK_EVENT;
+  for (i = 0, j = GPM_B_LEFT; i < 3; i++, j >>= 1 )
+    {
+      if (event->buttons & j) {
+        result->code = i; /* button number */
+        break;
+      }
+    }
+  gettimeofday(&now, 0);
+  result->timestamp = (now.tv_sec * 1000) + (now.tv_usec / 1000);
+
+  if (event->type & GPM_UP)
+    result->modifiers = up_modifier;
+  else if (event->type & GPM_DOWN)
+    result->modifiers = down_modifier;
+  else
+    result->modifiers = 0;
+  
+  if (event->type & GPM_SINGLE)
+    result->modifiers |= click_modifier;
+  
+  if (event->type & GPM_DOUBLE)
+    result->modifiers |= double_modifier;
+
+  if (event->type & GPM_TRIPLE)
+    result->modifiers |= triple_modifier;
+
+  if (event->type & GPM_DRAG)
+    result->modifiers |= drag_modifier;
+
+  if (!(event->type & (GPM_MOVE|GPM_DRAG))) {
+
+    /* 1 << KG_SHIFT */
+    if (event->modifiers & (1 << 0))
+      result->modifiers |= shift_modifier;
+
+    /* 1 << KG_CTRL */
+    if (event->modifiers & (1 << 2))
+      result->modifiers |= ctrl_modifier;
+
+    /* 1 << KG_ALT || KG_ALTGR */
+    if (event->modifiers & (1 << 3)
+        || event->modifiers & (1 << 1))
+      result->modifiers |= meta_modifier;
+  }
+
+  XSETINT (result->x, event->x - 1);
+  XSETINT (result->y, event->y - 1);
+  XSETFRAME (result->frame_or_window, f);
+  result->arg = Qnil;
+  return Qnil;
+}
+
+int 
+handle_one_term_event (struct tty_display_info *tty, Gpm_Event *event, struct input_event* hold_quit)
+{
+  struct frame *f = XFRAME (tty->top_frame);
+  int i, j, fd;
+  struct input_event ie;
+  int do_help = 0;
+  int count = 0;
+
+  EVENT_INIT (ie);
+  ie.kind = NO_EVENT;
+  ie.arg = Qnil;
+
+  if (event->type & GPM_MOVE) {
+    unsigned char buf[6 * sizeof (short)];
+    unsigned short *arg = (unsigned short *) buf + 1;
+    const char *name;
+
+    previous_help_echo_string = help_echo_string;
+    help_echo_string = Qnil;
+
+    /* Display mouse pointer */
+    buf[sizeof(short) - 1] = 2;  /* set selection */
+
+    arg[0] = arg[2] = (unsigned short) event->x;
+    arg[1] = arg[3] = (unsigned short) event->y;
+    arg[4] = (unsigned short) 3;
+    
+    name = (const char *) ttyname (0);
+    fd = open (name, O_WRONLY);
+    ioctl (fd, TIOCLINUX, buf + sizeof (short) - 1);
+    close(fd);
+
+    term_mouse_movement (f, event);
+
+    /* If the contents of the global variable help_echo_string
+       has changed, generate a HELP_EVENT.  */
+    if (!NILP (help_echo_string)
+        || !NILP (previous_help_echo_string))
+      do_help = 1;
+
+    goto done;
+  }
+  else {
+    f->mouse_moved = 0;
+    term_mouse_click (&ie, event, f);
+    //kbd_buffer_store_event_hold (&ie, hold_quit);
+  }
+
+ done:
+  if (ie.kind != NO_EVENT)
+    {
+      kbd_buffer_store_event_hold (&ie, hold_quit);
+      count++;
+    }
+
+  if (do_help
+      && !(hold_quit && hold_quit->kind != NO_EVENT))
+    {
+      Lisp_Object frame;
+
+      if (f)
+        XSETFRAME (frame, f);
+      else
+        frame = Qnil;
+
+      gen_help_event (help_echo_string, frame, help_echo_window,
+                      help_echo_object, help_echo_pos);
+      count++;
+    }
+
+  return count;
+}
+
+DEFUN ("term-open-connection", Fterm_open_connection, Sterm_open_connection,
+       0, 0, 0,
+       doc: /* Open a connection to Gpm.  */)
+     ()
+{
+  struct tty_display_info *tty = FRAME_TTY (SELECTED_FRAME ());
+  Gpm_Connect connection;
+
+  connection.eventMask = ~0;
+  connection.defaultMask = ~GPM_HARD;
+  connection.maxMod = ~0;
+  connection.minMod = 0;
+
+  /* We only support GPM on the controlling tty.  */
+  if (term_gpm || tty->terminal->id > 1
+      || Gpm_Open (&connection, 0) < 0)
+    return Qnil;
+  else
+    {
+      term_gpm = 1;
+      gpm_tty = tty->terminal->id;
+      reset_sys_modes (tty);
+      init_sys_modes (tty);
+      add_gpm_wait_descriptor (gpm_fd);
+      return Qt;
+    }
+}
+
+DEFUN ("term-close-connection", Fterm_close_connection, Sterm_close_connection,
+       0, 0, 0,
+       doc: /* Close a connection to Gpm.  */)
+     ()
+{
+   delete_gpm_wait_descriptor (gpm_fd);
+   while (Gpm_Close()); /* close all the stack */
+   term_gpm = 0;
+   return Qnil;
+}
+#endif /* HAVE_GPM */
+
+
+/***********************************************************************
                             Initialization
  ***********************************************************************/
 
@@ -2509,6 +3258,14 @@ init_tty (char *name, char *terminal_type, int must_succeed)
 
   encode_terminal_bufsize = 0;
 
+#ifdef HAVE_GPM
+  /* TODO: Can't get Gpm_Snapshot in term_mouse_position to work: test with
+     (mouse-position).  Also set-mouse-position won't work as is.  */
+  /* mouse_position_hook = term_mouse_position;  */
+
+  mouse_face_window = Qnil;
+#endif
+
 #ifdef WINDOWSNT
   initialize_w32_display ();
 
@@ -3139,6 +3896,10 @@ bigger, or it may make it blink, or it may do nothing at all.  */);
   defsubr (&Scontrolling_tty_p);
   defsubr (&Ssuspend_tty);
   defsubr (&Sresume_tty);
+#ifdef HAVE_GPM
+  defsubr (&Sterm_open_connection);
+  defsubr (&Sterm_close_connection);
+#endif /* HAVE_GPM */
 }
 
 
diff --git a/src/termhooks.h b/src/termhooks.h
index e9fcbb37750..373d1e34987 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -191,7 +191,11 @@ enum event_kind
      symbols, respectively.  Member `arg' is a Lisp object converted
      from the received Apple event.  Parameters for non-Apple events
      are converted to those in Apple events.  */
-  MAC_APPLE_EVENT
+  MAC_APPLE_EVENT,
+#endif
+
+#ifdef HAVE_GPM
+  GPM_CLICK_EVENT
 #endif
 };
 
@@ -290,6 +294,17 @@ enum {
   meta_modifier =  CHAR_META    /* Under X, the XK_Meta_[LR] keysyms.  */
 };
 
+#ifdef HAVE_GPM
+#include <gpm.h>
+extern int handle_one_term_event (struct tty_display_info *, Gpm_Event *, struct input_event *);
+
+/* Nonzero means mouse is enabled on Linux console */
+extern int term_gpm;
+
+/* The id of the terminal device for which we have gpm support.  */
+extern int gpm_tty;
+#endif
+
 #endif /* CONSP */
 
 
diff --git a/src/xdisp.c b/src/xdisp.c
index da2c0e7c7a0..8459be7abb7 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -12786,7 +12786,7 @@ redisplay_window (window, just_this_one_p)
   int rc;
   int centering_position = -1;
   int last_line_misfit = 0;
-  int save_beg_unchanged, save_end_unchanged;
+  int beg_unchanged, end_unchanged;
 
   SET_TEXT_POS (lpoint, PT, PT_BYTE);
   opoint = lpoint;
@@ -12851,8 +12851,8 @@ redisplay_window (window, just_this_one_p)
   set_buffer_internal_1 (XBUFFER (w->buffer));
   SET_TEXT_POS (opoint, PT, PT_BYTE);
 
-  save_beg_unchanged = BEG_UNCHANGED;
-  save_end_unchanged = END_UNCHANGED;
+  beg_unchanged = BEG_UNCHANGED;
+  end_unchanged = END_UNCHANGED;
 
   current_matrix_up_to_date_p
     = (!NILP (w->window_end_valid)
@@ -12977,6 +12977,8 @@ redisplay_window (window, just_this_one_p)
         w->force_start = Qt;
     }
 
+ force_start:
+
   /* Handle case where place to start displaying has been specified,
      unless the specified location is outside the accessible range.  */
   if (!NILP (w->force_start)
@@ -13156,40 +13158,16 @@ redisplay_window (window, just_this_one_p)
          than a simple mouse-click.  */
       if (NILP (w->start_at_line_beg)
           && NILP (do_mouse_tracking)
-          && CHARPOS (startp) > BEGV)
+          && CHARPOS (startp) > BEGV
+          && CHARPOS (startp) > BEG + beg_unchanged
+          && CHARPOS (startp) <= Z - end_unchanged)
         {
-#if 0
-          /* The following code tried to make BEG_UNCHANGED and
-             END_UNCHANGED up to date (similar to try_window_id).
-             Is it important to do so?
-
-             The trouble is that it's a little too strict when it
-             comes to overlays: modify_overlay can call
-             BUF_COMPUTE_UNCHANGED, which alters BUF_BEG_UNCHANGED and
-             BUF_END_UNCHANGED directly without moving the gap.
-
-             This can result in spurious recentering when overlays are
-             altered in the buffer.  So unless it's proven necessary,
-             let's leave this commented out for now. -- cyd.  */
-          if (MODIFF > SAVE_MODIFF
-              || BEG_UNCHANGED + END_UNCHANGED > Z_BYTE)
-            {
-              if (GPT - BEG < BEG_UNCHANGED)
-                BEG_UNCHANGED = GPT - BEG;
-              if (Z - GPT < END_UNCHANGED)
-                END_UNCHANGED = Z - GPT;
-            }
-#endif
-
-          if (CHARPOS (startp) > BEG + save_beg_unchanged
-              && CHARPOS (startp) <= Z - save_end_unchanged)
-            {
-              /* There doesn't seems to be a simple way to find a new
-                 window start that is near the old window start, so
-                 we just recenter.  */
-              goto recenter;
-            }
-        }
+          w->force_start = Qt;
+          if (XMARKER (w->start)->buffer == current_buffer)
+            compute_window_start_on_continuation_line (w);
+          SET_TEXT_POS_FROM_MARKER (startp, w->start);
+          goto force_start;
+        }
 
 #if GLYPH_DEBUG
       debug_method_add (w, "same window start");