*** empty log message ***

18 files changed, 305 insertions, 240 deletions

diff --git a/src/.gdbinit b/src/.gdbinit
index 55000f571eb..91a921119e8 100644
--- a/src/.gdbinit
+++ b/src/.gdbinit
@@ -91,6 +91,7 @@ end
 define xcons
 print (struct Lisp_Cons *) ($ & 0x00ffffff)
 print *$
+print $$
 end
 document xcons
 Print the contents of $, assuming it is an Elisp cons.
diff --git a/src/alloc.c b/src/alloc.c
index 9b7da1d0f5b..9c63f8fe132 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -1077,15 +1077,21 @@ Garbage collection happens automatically if you cons more than\n\
   tem = Fnthcdr (make_number (30), Vcommand_history);
   if (CONSP (tem))
     XCONS (tem)->cdr = Qnil;
+
   /* Likewise for undo information.  */
   {
     register struct buffer *nextb = all_buffers;
 
     while (nextb)
       {
-	nextb->undo_list 
-	  = truncate_undo_list (nextb->undo_list, undo_threshold,
-				undo_high_threshold);
+	/* If a buffer's undo list is Qt, that means that undo is
+	   turned off in that buffer.  Calling truncate_undo_list on
+	   Qt tends to return NULL, which effectively turns undo back on.
+	   So don't call truncate_undo_list if undo_list is Qt.  */
+	if (! EQ (nextb->undo_list, Qt))
+	  nextb->undo_list 
+	    = truncate_undo_list (nextb->undo_list, undo_threshold,
+				  undo_high_threshold);
 	nextb = nextb->next;
       }
   }
diff --git a/src/buffer.c b/src/buffer.c
index fbf6bb8b611..de9e4246f80 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -558,11 +558,22 @@ If BUFFER is omitted or nil, some interesting buffer is returned.")
 DEFUN ("buffer-disable-undo", Fbuffer_disable_undo, Sbuffer_disable_undo, 1,1,
 0,
   "Make BUFFER stop keeping undo information.")
-  (buf)
-     register Lisp_Object buf;
+  (buffer)
+     register Lisp_Object buffer;
 {
-  CHECK_BUFFER (buf, 0);
-  XBUFFER (buf)->undo_list = Qt;
+  Lisp_Object real_buffer;
+
+  if (NILP (buffer))
+    XSET (real_buffer, Lisp_Buffer, current_buffer);
+  else
+    {
+      real_buffer = Fget_buffer (buffer);
+      if (NILP (real_buffer))
+	nsberror (buffer);
+    }
+
+  XBUFFER (real_buffer)->undo_list = Qt;
+
   return Qnil;
 }
 
@@ -570,23 +581,22 @@ DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, Sbuffer_enable_undo,
        0, 1, "",
   "Start keeping undo information for buffer BUFFER.\n\
 No argument or nil as argument means do this for the current buffer.")
-  (buf)
-     register Lisp_Object buf;
+  (buffer)
+     register Lisp_Object buffer;
 {
-  register struct buffer *b;
-  register Lisp_Object buf1;
+  Lisp_Object real_buffer;
 
-  if (NILP (buf))
-    b = current_buffer;
+  if (NILP (buffer))
+    XSET (real_buffer, Lisp_Buffer, current_buffer);
   else
     {
-      buf1 = Fget_buffer (buf);
-      if (NILP (buf1)) nsberror (buf);
-      b = XBUFFER (buf1);
+      real_buffer = Fget_buffer (buffer);
+      if (NILP (real_buffer))
+	nsberror (buffer);
     }
 
-  if (EQ (b->undo_list, Qt))
-    b->undo_list = Qnil;
+  if (EQ (XBUFFER (real_buffer)->undo_list, Qt))
+    XBUFFER (real_buffer)->undo_list = Qnil;
 
   return Qnil;
 }
@@ -1285,10 +1295,7 @@ init_buffer_once ()
   /* super-magic invisible buffer */
   Vbuffer_alist = Qnil;
 
-  tem = Fset_buffer (Fget_buffer_create (build_string ("*scratch*")));
-  /* Want no undo records for *scratch*
-     until after Emacs is dumped */
-  Fbuffer_disable_undo (tem);
+  Fset_buffer (Fget_buffer_create (build_string ("*scratch*")));
 }
 
 init_buffer ()
diff --git a/src/callint.c b/src/callint.c
index 88c16721116..aeb6ef38720 100644
--- a/src/callint.c
+++ b/src/callint.c
@@ -179,12 +179,7 @@ Otherwise, this is done only if an arg is read using the minibuffer.")
 
  retry:
 
-  for (fun = function;
-       XTYPE (fun) == Lisp_Symbol && !EQ (fun, Qunbound);
-       fun = XSYMBOL (fun)->function)
-    {
-      QUIT;
-    }
+  fun = indirect_function (function);
 
   specs = Qnil;
   string = 0;
diff --git a/src/callproc.c b/src/callproc.c
index 9544ecf0a21..85fbcf7c784 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -125,25 +125,29 @@ If you quit, the process is killed with SIGKILL.")
       CHECK_STRING (infile, 1);
     }
   else
+#ifdef VMS
+    infile = build_string ("NLA0:");
+#else
     infile = build_string ("/dev/null");
+#endif /* not VMS */
 
-  {
-    register Lisp_Object tem;
-    if (nargs < 3)
-      buffer = Qnil;
-    else 
-      {
-	buffer = tem = args[2];
-	if (!(EQ (tem, Qnil) || EQ (tem, Qt)
-	      || XFASTINT (tem) == 0))
-	  {
-	    buffer = Fget_buffer (tem);
-	    CHECK_BUFFER (buffer, 2);
-	  }
-      }
-  }
+  if (nargs >= 3)
+    {
+      register Lisp_Object tem;
+
+      buffer = tem = args[2];
+      if (!(EQ (tem, Qnil)
+	    || EQ (tem, Qt)
+	    || XFASTINT (tem) == 0))
+	{
+	  buffer = Fget_buffer (tem);
+	  CHECK_BUFFER (buffer, 2);
+	}
+    }
+  else 
+    buffer = Qnil;
 
-  display = nargs >= 3 ? args[3] : Qnil;
+  display = nargs >= 4 ? args[3] : Qnil;
 
   {
     register int i;
diff --git a/src/data.c b/src/data.c
index 4e95494d593..df85ef254ea 100644
--- a/src/data.c
+++ b/src/data.c
@@ -37,7 +37,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 Lisp_Object Qnil, Qt, Qquote, Qlambda, Qsubr, Qunbound;
 Lisp_Object Qerror_conditions, Qerror_message, Qtop_level;
 Lisp_Object Qerror, Qquit, Qwrong_type_argument, Qargs_out_of_range;
-Lisp_Object Qvoid_variable, Qvoid_function;
+Lisp_Object Qvoid_variable, Qvoid_function, Qcyclic_function_indirection;
 Lisp_Object Qsetting_constant, Qinvalid_read_syntax;
 Lisp_Object Qinvalid_function, Qwrong_number_of_arguments, Qno_catch;
 Lisp_Object Qend_of_file, Qarith_error;
@@ -480,13 +480,13 @@ DEFUN ("fmakunbound", Ffmakunbound, Sfmakunbound, 1, 1, 0, "Make SYMBOL's functi
 
 DEFUN ("symbol-function", Fsymbol_function, Ssymbol_function, 1, 1, 0,
   "Return SYMBOL's function definition.  Error if that is void.")
-  (sym)
-     register Lisp_Object sym;
+  (symbol)
+     register Lisp_Object symbol;
 {
-  CHECK_SYMBOL (sym, 0);
-  if (EQ (XSYMBOL (sym)->function, Qunbound))
-    return Fsignal (Qvoid_function, Fcons (sym, Qnil));
-  return XSYMBOL (sym)->function;
+  CHECK_SYMBOL (symbol, 0);
+  if (EQ (XSYMBOL (symbol)->function, Qunbound))
+    return Fsignal (Qvoid_function, Fcons (symbol, Qnil));
+  return XSYMBOL (symbol)->function;
 }
 
 DEFUN ("symbol-plist", Fsymbol_plist, Ssymbol_plist, 1, 1, 0, "Return SYMBOL's property list.")
@@ -530,6 +530,7 @@ DEFUN ("setplist", Fsetplist, Ssetplist, 2, 2, 0,
   XSYMBOL (sym)->plist = newplist;
   return newplist;
 }
+
 
 /* Getting and setting values of symbols */
 
@@ -1094,6 +1095,61 @@ From now on the default value will apply in this buffer.")
   return sym;
 }
 
+/* Find the function at the end of a chain of symbol function indirections.  */
+
+/* If OBJECT is a symbol, find the end of its function chain and
+   return the value found there.  If OBJECT is not a symbol, just
+   return it.  If there is a cycle in the function chain, signal a
+   cyclic-function-indirection error.
+
+   This is like Findirect_function, except that it doesn't signal an
+   error if the chain ends up unbound.  */
+Lisp_Object
+indirect_function (object, error)
+  register Lisp_Object object;
+{
+  Lisp_Object tortise, hare;
+
+  hare = tortise = object;
+
+  for (;;)
+    {
+      if (XTYPE (hare) != Lisp_Symbol || EQ (hare, Qunbound))
+	break;
+      hare = XSYMBOL (hare)->function;
+      if (XTYPE (hare) != Lisp_Symbol || EQ (hare, Qunbound))
+	break;
+      hare = XSYMBOL (hare)->function;
+
+      tortise = XSYMBOL (tortise)->function;
+
+      if (EQ (hare, tortise))
+	Fsignal (Qcyclic_function_indirection, Fcons (object, Qnil));
+    }
+
+  return hare;
+}
+
+DEFUN ("indirect-function", Findirect_function, Sindirect_function, 1, 1, 0,
+  "Return the function at the end of OBJECT's function chain.\n\
+If OBJECT is a symbol, follow all function indirections and return the final\n\
+function binding.\n\
+If OBJECT is not a symbol, just return it.\n\
+Signal a void-function error if the final symbol is unbound.\n\
+Signal a cyclic-function-indirection error if there is a loop in the\n\
+function chain of symbols.")
+  (object)
+    register Lisp_Object object;
+{
+  Lisp_Object result;
+
+  result = indirect_function (object);
+
+  if (EQ (result, Qunbound))
+    return Fsignal (Qvoid_function, Fcons (object, Qnil));
+  return result;
+}
+
 /* Extract and set vector and string elements */
 
 DEFUN ("aref", Faref, Saref, 2, 2, 0,
@@ -1698,6 +1754,7 @@ syms_of_data ()
   Qwrong_type_argument = intern ("wrong-type-argument");
   Qargs_out_of_range = intern ("args-out-of-range");
   Qvoid_function = intern ("void-function");
+  Qcyclic_function_indirection = intern ("cyclic-function-indirection");
   Qvoid_variable = intern ("void-variable");
   Qsetting_constant = intern ("setting-constant");
   Qinvalid_read_syntax = intern ("invalid-read-syntax");
@@ -1762,6 +1819,11 @@ syms_of_data ()
   Fput (Qvoid_function, Qerror_message,
 	build_string ("Symbol's function definition is void"));
 
+  Fput (Qcyclic_function_indirection, Qerror_conditions,
+	Fcons (Qcyclic_function_indirection, Fcons (Qerror, Qnil)));
+  Fput (Qcyclic_function_indirection, Qerror_message,
+	build_string ("Symbol's chain of function indirections contains a loop"));
+
   Fput (Qvoid_variable, Qerror_conditions,
 	Fcons (Qvoid_variable, Fcons (Qerror, Qnil)));
   Fput (Qvoid_variable, Qerror_message,
@@ -1832,6 +1894,7 @@ syms_of_data ()
   staticpro (&Qwrong_type_argument);
   staticpro (&Qargs_out_of_range);
   staticpro (&Qvoid_function);
+  staticpro (&Qcyclic_function_indirection);
   staticpro (&Qvoid_variable);
   staticpro (&Qsetting_constant);
   staticpro (&Qinvalid_read_syntax);
@@ -1898,6 +1961,7 @@ syms_of_data ()
   defsubr (&Ssetcar);
   defsubr (&Ssetcdr);
   defsubr (&Ssymbol_function);
+  defsubr (&Sindirect_function);
   defsubr (&Ssymbol_plist);
   defsubr (&Ssymbol_name);
   defsubr (&Smakunbound);
diff --git a/src/editfns.c b/src/editfns.c
index 0ef059aa055..6164ef32799 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -680,7 +680,32 @@ Both arguments are required.")
 }
 
 
-/* Return a string with the contents of the current region */
+/* Making strings from buffer contents.  */
+
+/* Return a Lisp_String containing the text of the current buffer from
+   START to END.
+
+   We don't want to use plain old make_string here, because it calls
+   make_uninit_string, which can cause the buffer arena to be
+   compacted.  make_string has no way of knowing that the data has
+   been moved, and thus copies the wrong data into the string.  This
+   doesn't effect most of the other users of make_string, so it should
+   be left as is.  But we should use this function when conjuring
+   buffer substrings.  */
+Lisp_Object
+make_buffer_string (start, end)
+     int start, end;
+{
+  Lisp_Object result;
+
+  if (start < GPT && GPT < end)
+    move_gap (start);
+
+  result = make_uninit_string (end - start);
+  bcopy (&FETCH_CHAR (start), XSTRING (result)->data, end - start);
+
+  return result;
+}
 
 DEFUN ("buffer-substring", Fbuffer_substring, Sbuffer_substring, 2, 2, 0,
   "Return the contents of part of the current buffer as a string.\n\
@@ -690,33 +715,19 @@ they can be in either order.")
      Lisp_Object b, e;
 {
   register int beg, end;
-  Lisp_Object result;
 
   validate_region (&b, &e);
   beg = XINT (b);
   end = XINT (e);
 
-  if (beg < GPT && end > GPT)
-    move_gap (beg);
-
-  /* Plain old make_string calls make_uninit_string, which can cause
-     the buffer arena to be compacted.  make_string has no way of
-     knowing that the data has been moved, and thus copies the wrong
-     data into the string.  This doesn't effect most of the other
-     users of make_string, so it should be left as is.  */
-  result = make_uninit_string (end - beg);
-  bcopy (&FETCH_CHAR (beg), XSTRING (result)->data, end - beg);
-
-  return result;
+  return make_buffer_string (beg, end);
 }
 
 DEFUN ("buffer-string", Fbuffer_string, Sbuffer_string, 0, 0, 0,
   "Return the contents of the current buffer as a string.")
   ()
 {
-  if (BEGV < GPT && ZV > GPT)
-    move_gap (BEGV);
-  return make_string (BEGV_ADDR, ZV - BEGV);
+  return make_buffer_string (BEGV, ZV);
 }
 
 DEFUN ("insert-buffer-substring", Finsert_buffer_substring, Sinsert_buffer_substring,
diff --git a/src/eval.c b/src/eval.c
index c4fcc808c5d..ab0ae207f2c 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -465,12 +465,7 @@ and input is currently coming from the keyboard (not in keyboard macro).")
      that DOES eval its args.
      If it is a built-in function (such as load or eval-region)
      return nil.  */
-  fun = *btp->function;
-  while (XTYPE (fun) == Lisp_Symbol)
-    {
-      QUIT;
-      fun = Fsymbol_function (fun);
-    }
+  fun = Findirect_function (*btp->function);
   if (XTYPE (fun) == Lisp_Subr)
     return Qnil;
   /* btp points to the frame of a Lisp function that called interactive-p.
@@ -1206,14 +1201,9 @@ Also, a symbol satisfies `commandp' if its function definition does so.")
 
   fun = function;
 
-  /* Dereference symbols, but avoid infinte loops.  Eech.  */
-  while (XTYPE (fun) == Lisp_Symbol)
-    {
-      if (++i > 10) return Qnil;
-      tem = Ffboundp (fun);
-      if (NILP (tem)) return Qnil;
-      fun = Fsymbol_function (fun);
-    }
+  fun = indirect_function (fun);
+  if (EQ (fun, Qunbound))
+    return Qnil;
 
   /* Emacs primitives are interactive if their DEFUN specifies an
      interactive spec.  */
@@ -1333,14 +1323,8 @@ do_autoload (fundef, funname)
   Vautoload_queue = Qt;
   unbind_to (count, Qnil);
 
-  while (XTYPE (fun) == Lisp_Symbol)
-    {
-      QUIT;
-      val = XSYMBOL (fun)->function;
-      if (EQ (val, Qunbound))
-	Fsymbol_function (fun);	/* Get the right kind of error! */
-      fun = val;
-    }
+  fun = Findirect_function (fun);
+
   if (XTYPE (fun) == Lisp_Cons
       && EQ (XCONS (fun)->car, Qautoload))
     error ("Autoloading failed to define function %s",
@@ -1404,15 +1388,7 @@ DEFUN ("eval", Feval, Seval, 1, 1, 0,
   /* At this point, only original_fun and original_args
      have values that will be used below */
  retry:
-  fun = original_fun;
-  while (XTYPE (fun) == Lisp_Symbol)
-    {
-      QUIT;
-      val = XSYMBOL (fun)->function;
-      if (EQ (val, Qunbound))
-	Fsymbol_function (fun);	/* Get the right kind of error! */
-      fun = val;
-    }
+  fun = Findirect_function (original_fun);
 
   if (XTYPE (fun) == Lisp_Subr)
     {
@@ -1582,16 +1558,12 @@ Thus, (apply '+ 1 2 '(3 4)) returns 10.")
 
   numargs += nargs - 2;
 
-  while (XTYPE (fun) == Lisp_Symbol)
+  fun = indirect_function (fun);
+  if (EQ (fun, Qunbound))
     {
-      QUIT;
-      fun = XSYMBOL (fun)->function;
-      if (EQ (fun, Qunbound))
-	{
-	  /* Let funcall get the error */
-	  fun = args[0];
-	  goto funcall;
-	}
+      /* Let funcall get the error */
+      fun = args[0];
+      goto funcall;
     }
 
   if (XTYPE (fun) == Lisp_Subr)
@@ -1779,14 +1751,8 @@ Thus, (funcall 'cons 'x 'y) returns (x . y).")
  retry:
 
   fun = args[0];
-  while (XTYPE (fun) == Lisp_Symbol)
-    {
-      QUIT;
-      val = XSYMBOL (fun)->function;
-      if (EQ (val, Qunbound))
-	Fsymbol_function (fun);	/* Get the right kind of error! */
-      fun = val;
-    }
+
+  fun = Findirect_function (fun);
 
   if (XTYPE (fun) == Lisp_Subr)
     {
diff --git a/src/fileio.c b/src/fileio.c
index f977ee0c623..a317db7c69f 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -17,6 +17,7 @@ You should have received a copy of the GNU General Public License
 along with GNU Emacs; see the file COPYING.  If not, write to
 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
+#include "config.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -52,7 +53,6 @@ extern int sys_nerr;
 #include <sys/time.h>
 #endif
 
-#include "config.h"
 #include "lisp.h"
 #include "buffer.h"
 #include "window.h"
diff --git a/src/keyboard.c b/src/keyboard.c
index e6139cfaf11..5b0d5facfc6 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -43,6 +43,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #include "syssignal.h"
 #include "systerm.h"
+#include "systime.h"
 
 extern int errno;
 
@@ -311,8 +312,9 @@ Lisp_Object Qmode_line;
 Lisp_Object Qvertical_split;
 
 
-/* Address (if not 0) of word to zero out if a SIGIO interrupt happens.  */
-long *input_available_clear_word;
+/* Address (if not 0) of EMACS_TIME to zero out if a SIGIO interrupt
+   happens.  */
+EMACS_TIME *input_available_clear_time;
 
 /* Nonzero means use SIGIO interrupts; zero means use CBREAK mode.
    Default is 1 if INTERRUPT_INPUT is defined.  */
@@ -1160,8 +1162,7 @@ read_char (commandflag)
       XSET (Vlast_event_screen, Lisp_Screen, selected_screen);
 #endif
 
-      waiting_for_input = 0;
-      input_available_clear_word = 0;
+      clear_waiting_for_input ();
 
       goto non_reread;
     }
@@ -1491,7 +1492,7 @@ kbd_buffer_store_event (event)
 	     will set Vlast_event_screen again, so this is safe to do.  */
 	  extern SIGTYPE interrupt_signal ();
 	  XSET (Vlast_event_screen, Lisp_Screen, event->screen);
-	  last_event_timestamp = XINT (event->timestamp);
+	  last_event_timestamp = event->timestamp;
 	  interrupt_signal ();
 	  return;
 	}
@@ -2237,8 +2238,8 @@ input_available_signal (signo)
   sigisheld (SIGIO);
 #endif
 
-  if (input_available_clear_word)
-    *input_available_clear_word = 0;
+  if (input_available_clear_time)
+    EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
 
   while (1)
     {
@@ -2793,13 +2794,7 @@ Otherwise, that is done only if an arg is read using the minibuffer.")
 
   while (1)
     {
-      final = cmd;
-      while (XTYPE (final) == Lisp_Symbol)
-	{
-	  if (EQ (Qunbound, XSYMBOL (final)->function))
-	    Fsymbol_function (final);    /* Get an error! */
-	  final = XSYMBOL (final)->function;
-	}
+      final = Findirect_function (cmd);
 
       if (CONSP (final) && (tem = Fcar (final), EQ (tem, Qautoload)))
 	do_autoload (final, cmd);
@@ -3012,6 +3007,14 @@ detect_input_pending ()
   return input_pending;
 }
 
+/* This is called in some cases before a possible quit.
+   It cases the next call to detect_input_pending to recompute input_pending.
+   So calling this function unnecessarily can't do any harm.  */
+clear_input_pending ()
+{
+  input_pending = 0;
+}
+
 DEFUN ("input-pending-p", Finput_pending_p, Sinput_pending_p, 0, 0, 0,
   "T if command input is currently available with no waiting.\n\
 Actually, the value is nil only if we can be sure that no input is available.")
@@ -3194,10 +3197,10 @@ stuff_buffered_input (stuffstring)
 #endif /* BSD and not BSD4_1 */
 }
 
-set_waiting_for_input (word_to_clear)
-     long *word_to_clear;
+set_waiting_for_input (time_to_clear)
+     EMACS_TIME *time_to_clear;
 {
-  input_available_clear_word = word_to_clear;
+  input_available_clear_time = time_to_clear;
 
   /* Tell interrupt_signal to throw back to read_char,  */
   waiting_for_input = 1;
@@ -3219,7 +3222,7 @@ clear_waiting_for_input ()
 {
   /* Tell interrupt_signal not to throw back to read_char,  */
   waiting_for_input = 0;
-  input_available_clear_word = 0;
+  input_available_clear_time = 0;
 }
 
 /* This routine is called at interrupt level in response to C-G.
diff --git a/src/lisp.h b/src/lisp.h
index b263370dac6..b0b0cb4fc56 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -852,6 +852,7 @@ extern Lisp_Object Fcar (), Fcar_safe(), Fcdr (), Fcdr_safe();
 extern Lisp_Object Fsetcar (), Fsetcdr ();
 extern Lisp_Object Fboundp (), Ffboundp (), Fmakunbound (), Ffmakunbound ();
 extern Lisp_Object Fsymbol_function (), Fsymbol_plist (), Fsymbol_name ();
+extern Lisp_Object indirect_function (), Findirect_function ();
 extern Lisp_Object Ffset (), Fsetplist ();
 extern Lisp_Object Fsymbol_value (), find_symbol_value (), Fset ();
 extern Lisp_Object Fdefault_value (), Fset_default ();
@@ -951,7 +952,8 @@ extern Lisp_Object Ffollowing_char (), Fprevious_char (), Fchar_after ();
 extern Lisp_Object Finsert ();
 extern Lisp_Object Feolp (), Feobp (), Fbolp (), Fbobp ();
 extern Lisp_Object Fformat (), format1 ();
-extern Lisp_Object Fbuffer_substring (), Fbuffer_string ();
+extern Lisp_Object make_buffer_string (), Fbuffer_substring ();
+extern Lisp_Object Fbuffer_string ();
 extern Lisp_Object Fstring_equal (), Fstring_lessp (), Fbuffer_substring_lessp ();
 extern Lisp_Object save_excursion_save (), save_restriction_save ();
 extern Lisp_Object save_excursion_restore (), save_restriction_restore ();
diff --git a/src/minibuf.c b/src/minibuf.c
index 93c9f26727a..df45dac7483 100644
--- a/src/minibuf.c
+++ b/src/minibuf.c
@@ -1,11 +1,11 @@
 /* Minibuffer input and completion.
-   Copyright (C) 1985, 1986 Free Software Foundation, Inc.
+   Copyright (C) 1985, 1986, 1992 Free Software Foundation, Inc.
 
 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 1, or (at your option)
+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,
@@ -195,7 +195,7 @@ read_minibuf (map, initial, prompt, backup_n, expflag)
     }
 
   /* Make minibuffer contents into a string */
-  val = make_string (BEG_ADDR, Z - BEG);
+  val = make_buffer_string (1, Z);
   bcopy (GAP_END_ADDR, XSTRING (val)->data + GPT - BEG, Z - GPT);
   unbind_to (count, Qnil);	/* The appropriate screen will get selected
 				   in set-window-configuration.  */
diff --git a/src/process.c b/src/process.c
index 9ba48ef7d56..68bdfa334e6 100644
--- a/src/process.c
+++ b/src/process.c
@@ -65,41 +65,12 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include <bsdtty.h>
 #endif
 
-#ifdef HPUX
-#undef TIOCGPGRP
-#endif
-
 #ifdef IRIS
 #include <sys/sysmacros.h>	/* for "minor" */
 #endif /* not IRIS */
 
 #include "systime.h"
-
-#if defined (HPUX) && defined (HAVE_PTYS)
-#include <sys/ptyio.h>
-#endif
-
-#ifdef AIX
-#include <sys/pty.h>
-#include <unistd.h>
-#endif
-
-#ifdef SYSV_PTYS
-#include <sys/tty.h>
-#ifdef titan
-#include <sys/ttyhw.h>
-#include <sys/stream.h>
-#endif
-#include <sys/pty.h>
-#endif
-
-#ifdef XENIX
-#undef TIOCGETC  /* Avoid confusing some conditionals that test this.  */
-#endif
-
-#ifdef BROKEN_TIOCGETC
-#undef TIOCGETC
-#endif
+#include "systerm.h"
 
 #include "lisp.h"
 #include "window.h"
@@ -1690,10 +1661,6 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
       EMACS_ADD_TIME (end_time, end_time, timeout);
     }
 
-  /* Turn off periodic alarms (in case they are in use)
-     because the select emulator uses alarms.  */
-  stop_polling ();
-
   while (1)
     {
       /* If calling from keyboard input, do not quit
@@ -1752,6 +1719,13 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
       if (!read_kbd)
 	FD_CLR (0, &Available);
 
+      /* If screen size has changed or the window is newly mapped,
+	 redisplay now, before we start to wait.  There is a race
+	 condition here; if a SIGIO arrives between now and the select
+	 and indicates that a screen is trashed, we lose.  */
+      if (screen_garbaged)
+	redisplay_preserve_echo_area ();
+
       if (read_kbd && detect_input_pending ())
 	nfds = 0;
       else
@@ -1765,7 +1739,7 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
       /*  If we woke up due to SIGWINCH, actually change size now.  */
       do_pending_window_change ();
 
-      if (time_limit && nfds == 0)	/* timeout elapsed */
+      if (time_limit && nfds == 0) /* timeout elapsed */
 	break;
       if (nfds < 0)
 	{
@@ -1787,7 +1761,7 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
 		 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
 		 in m-ibmrt-aix.h), and here we just ignore the select error.
 		 Cleanup occurs c/o status_notify after SIGCLD. */
-	      FD_ZERO (&Available);          /* Cannot depend on values returned */
+	      FD_ZERO (&Available); /* Cannot depend on values returned */
 #else
 	      abort ();
 #endif
@@ -1815,8 +1789,8 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
 	 but select says there is input.  */
 
       /*
-      if (read_kbd && interrupt_input && (Available & fileno (stdin)))
-      */
+	if (read_kbd && interrupt_input && (Available & fileno (stdin)))
+	*/
       if (read_kbd && interrupt_input && (FD_ISSET (fileno (stdin), &Available)))
 	kill (0, SIGIO);
 #endif
@@ -1839,11 +1813,6 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
       if (read_kbd)
 	do_pending_window_change ();
 
-      /* If screen size has changed, redisplay now
-	 for either sit-for or keyboard input.  */
-      if (read_kbd && screen_garbaged)
-	redisplay_preserve_echo_area ();
-
       /* Check for data from a process or a command channel */
       for (channel = FIRST_PROC_DESC; channel < MAXDESC; channel++)
 	{
@@ -1880,7 +1849,7 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
 		    }
 		  continue;
 		}
-#endif /* vipc */
+#endif				/* vipc */
 
 	      /* Read data from the process, starting with our
 		 buffered-ahead character if we have one.  */
@@ -1914,9 +1883,9 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
 		 subprocess termination and SIGCHLD.  */
 	      else if (nread == 0 && !NETCONN_P (proc))
 		;
-#endif /* O_NDELAY */
-#endif /* O_NONBLOCK */
-#endif /* EWOULDBLOCK */
+#endif				/* O_NDELAY */
+#endif				/* O_NONBLOCK */
+#endif				/* EWOULDBLOCK */
 #ifdef HAVE_PTYS
 	      /* On some OSs with ptys, when the process on one end of
 		 a pty exits, the other end gets an error reading with
@@ -1927,9 +1896,9 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
 		 get a SIGCHLD). */
 	      else if (nread == -1 && errno == EIO)
 		;
-#endif /* HAVE_PTYS */
-/* If we can detect process termination, don't consider the process
-   gone just because its pipe is closed.  */
+#endif				/* HAVE_PTYS */
+	      /* If we can detect process termination, don't consider the process
+		 gone just because its pipe is closed.  */
 #ifdef SIGCHLD
 	      else if (nread == 0 && !NETCONN_P (proc))
 		;
@@ -1946,11 +1915,18 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
 		      = Fcons (Qexit, Fcons (make_number (256), Qnil));
 		}
 	    }
-	} /* end for each file descriptor */
-    } /* end while exit conditions not met */
+	}			/* end for each file descriptor */
+    }				/* end while exit conditions not met */
 
-  /* Resume periodic signals to poll for input, if necessary.  */
-  start_polling ();
+  /* If calling from keyboard input, do not quit
+     since we want to return C-g as an input character.
+     Otherwise, do pending quit if requested.  */
+  if (read_kbd >= 0)
+    {
+      /* Prevent input_pending from remaining set if we quit.  */
+      clear_input_pending ();
+      QUIT;
+    }
 
   return got_some_input;
 }
diff --git a/src/search.c b/src/search.c
index 9ac63aea874..5f1f17f2d53 100644
--- a/src/search.c
+++ b/src/search.c
@@ -210,80 +210,94 @@ matched by parenthesis constructs in the pattern.")
   return make_number (val);
 }
 
-scan_buffer (target, pos, cnt, shortage)
-     int *shortage, pos;
-     register int cnt, target;
+/* Search for COUNT instances of the character TARGET, starting at START.
+   If COUNT is negative, search backwards.
+
+   If we find COUNT instances, set *SHORTAGE to zero, and return the
+   position of the COUNTth character.
+
+   If we don't find COUNT instances before reaching the end of the
+   buffer (or the beginning, if scanning backwards), set *SHORTAGE to
+   the number of TARGETs left unfound, and return the end of the
+   buffer we bumped up against.  */
+
+scan_buffer (target, start, count, shortage)
+     int *shortage, start;
+     register int count, target;
 {
-  int lim = ((cnt > 0) ? ZV - 1 : BEGV);
-  int direction = ((cnt > 0) ? 1 : -1);
-  register int lim0;
+  int limit = ((count > 0) ? ZV - 1 : BEGV);
+  int direction = ((count > 0) ? 1 : -1);
+
+  register unsigned char *cursor;
   unsigned char *base;
-  register unsigned char *cursor, *limit;
+
+  register int ceiling;
+  register unsigned char *ceiling_addr;
 
   if (shortage != 0)
     *shortage = 0;
 
   immediate_quit = 1;
 
-  if (cnt > 0)
-    while (pos != lim + 1)
+  if (count > 0)
+    while (start != limit + 1)
       {
-	lim0 =  BUFFER_CEILING_OF (pos);
-	lim0 = min (lim, lim0);
-	limit = &FETCH_CHAR (lim0) + 1;
-	base = (cursor = &FETCH_CHAR (pos));
+	ceiling =  BUFFER_CEILING_OF (start);
+	ceiling = min (limit, ceiling);
+	ceiling_addr = &FETCH_CHAR (ceiling) + 1;
+	base = (cursor = &FETCH_CHAR (start));
 	while (1)
 	  {
-	    while (*cursor != target && ++cursor != limit)
+	    while (*cursor != target && ++cursor != ceiling_addr)
 	      ;
-	    if (cursor != limit)
+	    if (cursor != ceiling_addr)
 	      {
-		if (--cnt == 0)
+		if (--count == 0)
 		  {
 		    immediate_quit = 0;
-		    return (pos + cursor - base + 1);
+		    return (start + cursor - base + 1);
 		  }
 		else
-		  if (++cursor == limit)
+		  if (++cursor == ceiling_addr)
 		    break;
 	      }
 	    else
 	      break;
 	  }
-	pos += cursor - base;
+	start += cursor - base;
       }
   else
     {
-      pos--;			/* first character we scan */
-      while (pos > lim - 1)
-	{			/* we WILL scan under pos */
-	  lim0 =  BUFFER_FLOOR_OF (pos);
-	  lim0 = max (lim, lim0);
-	  limit = &FETCH_CHAR (lim0) - 1;
-	  base = (cursor = &FETCH_CHAR (pos));
+      start--;			/* first character we scan */
+      while (start > limit - 1)
+	{			/* we WILL scan under start */
+	  ceiling =  BUFFER_FLOOR_OF (start);
+	  ceiling = max (limit, ceiling);
+	  ceiling_addr = &FETCH_CHAR (ceiling) - 1;
+	  base = (cursor = &FETCH_CHAR (start));
 	  cursor++;
 	  while (1)
 	    {
-	      while (--cursor != limit && *cursor != target)
+	      while (--cursor != ceiling_addr && *cursor != target)
 		;
-	      if (cursor != limit)
+	      if (cursor != ceiling_addr)
 		{
-		  if (++cnt == 0)
+		  if (++count == 0)
 		    {
 		      immediate_quit = 0;
-		      return (pos + cursor - base + 1);
+		      return (start + cursor - base + 1);
 		    }
 		}
 	      else
 		break;
 	    }
-	  pos += cursor - base;
+	  start += cursor - base;
 	}
     }
   immediate_quit = 0;
   if (shortage != 0)
-    *shortage = cnt * direction;
-  return (pos + ((direction == 1 ? 0 : 1)));
+    *shortage = count * direction;
+  return (start + ((direction == 1 ? 0 : 1)));
 }
 
 int
diff --git a/src/sysdep.c b/src/sysdep.c
index 5f6090a2460..51c5bd920a7 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -479,7 +479,7 @@ child_setup_tty (out)
 setpgrp_of_tty (pid)
      int pid;
 {
-  EMACS_SET_TTY_PGRP (input_fd, pid);
+  EMACS_SET_TTY_PGRP (input_fd, &pid);
 }
 
 /* Record a signal code and the handler for it.  */
@@ -1199,7 +1199,7 @@ kbd_input_ast ()
 {
   register int c = -1;
   int old_errno = errno;
-  extern int *input_available_clear_word;
+  extern EMACS_TIME *input_available_clear_time;
 
   if (waiting_for_ast)
     SYS$SETEF (input_ef);
@@ -1236,8 +1236,8 @@ kbd_input_ast ()
       kbd_buffer_store_event (&e);
     }
 
-  if (input_available_clear_word)
-    *input_available_clear_word = 0;
+  if (input_available_clear_time)
+    EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
   errno = old_errno;
 }
 
diff --git a/src/systty.h b/src/systty.h
index 4bbf021595d..910810dc15d 100644
--- a/src/systty.h
+++ b/src/systty.h
@@ -61,6 +61,10 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #ifdef SYSV_PTYS
 #include <sys/tty.h>
+#ifdef titan
+#include <sys/ttyhw.h>
+#include <sys/stream.h>
+#endif
 #include <sys/pty.h>
 #endif
 
@@ -78,6 +82,10 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #undef TIOCSTART
 #endif
 
+#ifdef XENIX
+#undef TIOCGETC  /* Avoid confusing some conditionals that test this.  */
+#endif
+
 #ifdef BROKEN_TIOCGETC
 #undef TIOCGETC  /* Avoid confusing some conditionals that test this.  */
 #endif
@@ -128,6 +136,10 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
    EMACS_SET_TTY_PGRP(int FD, int *PGID) sets the terminal FD's
    current process group to *PGID.  Return -1 if there is an error.  */
 
+#ifdef HPUX
+/* HPUX tty process group stuff doesn't work, says the anonymous voice
+   from the past.  */
+#else
 #ifdef TIOCGPGRP
 #define EMACS_HAVE_TTY_PGRP
 #else
@@ -135,6 +147,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #define EMACS_HAVE_TTY_PGRP
 #endif
 #endif
+#endif
 
 #ifdef EMACS_HAVE_TTY_PGRP
 
diff --git a/src/termhooks.h b/src/termhooks.h
index ff1df84059d..08c8e818e80 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -1,12 +1,12 @@
 /* Hooks by which low level terminal operations
    can be made to call other routines.
-   Copyright (C) 1985, 1986 Free Software Foundation, Inc.
+   Copyright (C) 1985, 1986, 1992 Free Software Foundation, Inc.
 
 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 1, or (at your option)
+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,
@@ -138,7 +138,7 @@ struct input_event {
   struct screen *screen;
   int modifiers;		/* See enum below for interpretation.  */
   Lisp_Object x, y;
-  Lisp_Object timestamp;
+  unsigned long timestamp;
 };
 
 /* Bits in the modifiers member of the input_event structure.  */
diff --git a/src/xselect.c.old b/src/xselect.c.old
index a8c26f7e994..a88208bece9 100644
--- a/src/xselect.c.old
+++ b/src/xselect.c.old
@@ -1,11 +1,11 @@
 /* X Selection processing for emacs
-   Copyright (C) 1990 Free Software Foundation.
+   Copyright (C) 1990, 1992 Free Software Foundation.
 
 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 1, or (at your option)
+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,
@@ -32,6 +32,9 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 /* The last 23 bits of the timestamp of the last mouse button event. */
 extern Time mouse_timestamp;
 
+/* An expedient hack!  Fix this!  */
+#define last_event_timestamp CurrentTime
+
 /* t if a mouse button is depressed. */
 extern Lisp_Object Vmouse_grabbed;
 
@@ -130,7 +133,7 @@ own_selection (selection_type, time)
 		      selecting_window, time);
   owner_window = XGetSelectionOwner (x_current_display, selection_type);
 
-  if (owner_window != selecting_window)
+      if (owner_window != selecting_window)
     return 0;
 
   return 1;
@@ -160,7 +163,7 @@ but optional second argument TYPE may specify secondary or clipboard.")
 	  x_begin_selection_own = event_time;
 	  val = Vx_selection_value = string;
 	}
-      UNBLOCK_INPUT;
+	  UNBLOCK_INPUT;
     }
   else if (EQ (type, Qsecondary))
     {
@@ -177,10 +180,10 @@ but optional second argument TYPE may specify secondary or clipboard.")
       BLOCK_INPUT;
       if (own_selection (Xatom_clipboard, event_time))
 	{
-	  x_begin_clipboard_own = event_time;
+  x_begin_clipboard_own = event_time;
 	  val = Vx_clipboard_value = string;
 	}
-      UNBLOCK_INPUT;
+  UNBLOCK_INPUT;
     }
   else
     error ("Invalid X selection type");
@@ -545,7 +548,7 @@ selection, but optional argument TYPE may specify secondary or clipboard.")
   if (NILP (type) || EQ (type, Qprimary))
     {
       if (!NILP (Vx_selection_value))
-	return Vx_selection_value;
+    return Vx_selection_value;
 
       return get_selection_value (XA_PRIMARY);
     }