--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/editfns.c	Mon Aug 13 11:28:15 2007 +0200
@@ -0,0 +1,2532 @@
+/* Lisp functions pertaining to editing.
+   Copyright (C) 1985-1987, 1989, 1992-1995 Free Software Foundation, Inc.
+   Copyright (C) 1995 Tinker Systems and INS Engineering Corp.
+   Copyright (C) 1996 Ben Wing.
+
+This file is part of XEmacs.
+
+XEmacs 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.
+
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: Mule 2.0, FSF 19.30. */
+
+/* This file has been Mule-ized. */
+
+/* Hacked on for Mule by Ben Wing, December 1994. */
+
+#include <config.h>
+#include "lisp.h"
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "buffer.h"
+#include "commands.h"
+#include "events.h"             /* for EVENTP */
+#include "extents.h"
+#include "frame.h"
+#include "insdel.h"
+#include "window.h"
+#include "chartab.h"
+#include "line-number.h"
+
+#include "systime.h"
+#include "sysdep.h"
+#include "syspwd.h"
+#include "sysfile.h"			/* for getcwd */
+
+/* Some static data, and a function to initialize it for each run */
+
+Lisp_Object Vsystem_name;	/* #### - I don't see why this should be */
+				/* static, either...  --Stig */
+#if 0				/* XEmacs - this is now dynamic */
+				/* if at some point it's deemed desirable to
+				   use lisp variables here, then they can be
+				   initialized to nil and then set to their
+				   real values upon the first call to the
+				   functions that generate them. --stig */
+Lisp_Object Vuser_real_login_name; /* login name of current user ID */
+Lisp_Object Vuser_login_name;	/* user name from LOGNAME or USER.  */
+#endif
+
+/* It's useful to be able to set this as user customization, so we'll
+   keep it. */
+Lisp_Object Vuser_full_name;
+EXFUN (Fuser_full_name, 1);
+
+Lisp_Object Qformat;
+
+Lisp_Object Qpoint, Qmark, Qregion_beginning, Qregion_end;
+
+Lisp_Object Quser_files_and_directories;
+
+/* This holds the value of `environ' produced by the previous
+   call to Fset_time_zone_rule, or 0 if Fset_time_zone_rule
+   has never been called.  */
+static char **environbuf;
+
+void
+init_editfns (void)
+{
+/* Only used in removed code below. */
+  char *p;
+
+  environbuf = 0;
+
+  /* Set up system_name even when dumping.  */
+  init_system_name ();
+
+#ifndef CANNOT_DUMP
+  if (!initialized)
+    return;
+#endif
+
+  if ((p = getenv ("NAME")))
+    /* I don't think it's the right thing to do the ampersand
+       modification on NAME.  Not that it matters anymore...  -hniksic */
+    Vuser_full_name = build_ext_string (p, FORMAT_OS);
+  else
+    Vuser_full_name = Fuser_full_name (Qnil);
+}
+
+DEFUN ("char-to-string", Fchar_to_string, 1, 1, 0, /*
+Convert arg CH to a one-character string containing that character.
+*/
+       (ch))
+{
+  Bytecount len;
+  Bufbyte str[MAX_EMCHAR_LEN];
+
+  if (EVENTP (ch))
+    {
+      Lisp_Object ch2 = Fevent_to_character (ch, Qt, Qnil, Qnil);
+      if (NILP (ch2))
+	return
+	  signal_simple_continuable_error
+	    ("character has no ASCII equivalent:", Fcopy_event (ch, Qnil));
+      ch = ch2;
+    }
+
+  CHECK_CHAR_COERCE_INT (ch);
+
+  len = set_charptr_emchar (str, XCHAR (ch));
+  return make_string (str, len);
+}
+
+DEFUN ("string-to-char", Fstring_to_char, 1, 1, 0, /*
+Convert arg STRING to a character, the first character of that string.
+An empty string will return the constant `nil'.
+*/
+       (str))
+{
+  struct Lisp_String *p;
+  CHECK_STRING (str);
+
+  p = XSTRING (str);
+  if (string_length (p) != 0)
+    return make_char (string_char (p, 0));
+  else
+    /* This used to return Qzero.  That is broken, broken, broken. */
+    /* It might be kinder to signal an error directly. -slb */
+    return Qnil;
+}
+
+
+static Lisp_Object
+buildmark (Bufpos val, Lisp_Object buffer)
+{
+  Lisp_Object mark = Fmake_marker ();
+  Fset_marker (mark, make_int (val), buffer);
+  return mark;
+}
+
+DEFUN ("point", Fpoint, 0, 1, 0, /*
+Return value of point, as an integer.
+Beginning of buffer is position (point-min).
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return make_int (BUF_PT (b));
+}
+
+DEFUN ("point-marker", Fpoint_marker, 0, 2, 0, /*
+Return value of point, as a marker object.
+This marker is a copy; you may modify it with reckless abandon.
+If optional argument DONT-COPY-P is non-nil, then it returns the real
+point-marker; modifying the position of this marker will move point.
+It is illegal to change the buffer of it, or make it point nowhere.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (dont_copy_p, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  if (NILP (dont_copy_p))
+    return Fcopy_marker (b->point_marker, Qnil);
+  else
+    return b->point_marker;
+}
+
+/* The following two functions end up being identical but it's
+   cleaner to declare them separately. */
+
+Bufpos
+bufpos_clip_to_bounds (Bufpos lower, Bufpos num, Bufpos upper)
+{
+  return (num < lower ? lower :
+	  num > upper ? upper :
+	  num);
+}
+
+Bytind
+bytind_clip_to_bounds (Bytind lower, Bytind num, Bytind upper)
+{
+  return (num < lower ? lower :
+	  num > upper ? upper :
+	  num);
+}
+
+/*
+ * Chuck says:
+ * There is no absolute way to determine if goto-char is the function
+ * being run.  this-command doesn't work because it is often eval'd
+ * and this-command ends up set to eval-expression.  So this flag gets
+ * added for now.
+ *
+ * Jamie thinks he's wrong, but we'll leave this in for now.
+ */
+int atomic_extent_goto_char_p;
+
+DEFUN ("goto-char", Fgoto_char, 1, 2, "NGoto char: ", /*
+Set point to POSITION, a number or marker.
+Beginning of buffer is position (point-min), end is (point-max).
+If BUFFER is nil, the current buffer is assumed.
+Return value of POSITION, as an integer.
+*/
+       (position, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  Bufpos n = get_buffer_pos_char (b, position, GB_COERCE_RANGE);
+  BUF_SET_PT (b, n);
+  atomic_extent_goto_char_p = 1;
+  return make_int (n);
+}
+
+static Lisp_Object
+region_limit (int beginningp, struct buffer *b)
+{
+  Lisp_Object m;
+
+#if 0 /* FSFmacs */
+  if (!NILP (Vtransient_mark_mode) && NILP (Vmark_even_if_inactive)
+      && NILP (b->mark_active))
+    Fsignal (Qmark_inactive, Qnil);
+#endif
+  m = Fmarker_position (b->mark);
+  if (NILP (m)) error ("There is no region now");
+  if (!!(BUF_PT (b) < XINT (m)) == !!beginningp)
+    return make_int (BUF_PT (b));
+  else
+    return m;
+}
+
+DEFUN ("region-beginning", Fregion_beginning, 0, 1, 0, /*
+Return position of beginning of region in BUFFER, as an integer.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  return region_limit (1, decode_buffer (buffer, 1));
+}
+
+DEFUN ("region-end", Fregion_end, 0, 1, 0, /*
+Return position of end of region in BUFFER, as an integer.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  return region_limit (0, decode_buffer (buffer, 1));
+}
+
+/* Whether to use lispm-style active-regions */
+int zmacs_regions;
+
+/* Whether the zmacs region is active.  This is not per-buffer because
+   there can be only one active region at a time.  #### Now that the
+   zmacs region are not directly tied to the X selections this may not
+   necessarily have to be true.  */
+int zmacs_region_active_p;
+
+int zmacs_region_stays;
+
+Lisp_Object Qzmacs_update_region, Qzmacs_deactivate_region;
+Lisp_Object Qzmacs_region_buffer;
+
+void
+zmacs_update_region (void)
+{
+  /* This function can GC */
+  if (zmacs_region_active_p)
+    call0 (Qzmacs_update_region);
+}
+
+void
+zmacs_deactivate_region (void)
+{
+  /* This function can GC */
+  if (zmacs_region_active_p)
+    call0 (Qzmacs_deactivate_region);
+}
+
+Lisp_Object
+zmacs_region_buffer (void)
+{
+  if (zmacs_region_active_p)
+    return call0 (Qzmacs_region_buffer);
+  else
+    return Qnil;
+}
+
+DEFUN ("mark-marker", Fmark_marker, 0, 2, 0, /*
+Return this buffer's mark, as a marker object.
+If `zmacs-regions' is true, then this returns nil unless the region is
+currently in the active (highlighted) state.  If optional argument FORCE
+is t, this returns the mark (if there is one) regardless of the zmacs-region
+state.  You should *generally* not use the mark unless the region is active,
+if the user has expressed a preference for the zmacs-region model.
+Watch out!  Moving this marker changes the mark position.
+If you set the marker not to point anywhere, the buffer will have no mark.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (force, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  if (! zmacs_regions || zmacs_region_active_p || !NILP (force))
+    return b->mark;
+  return Qnil;
+}
+
+
+/* The saved object is a cons:
+
+   (COPY-OF-POINT-MARKER . COPY-OF-MARK)
+
+   We used to have another cons for a VISIBLE-P element, which was t
+   if `(eq (current-buffer) (window-buffer (selected-window)))' but it
+   was unused for a long time, so I removed it.  --hniksic */
+Lisp_Object
+save_excursion_save (void)
+{
+  struct buffer *b;
+
+  /* #### Huh?  --hniksic */
+  /*if (preparing_for_armageddon) return Qnil;*/
+
+#ifdef ERROR_CHECK_BUFPOS
+  assert (XINT (Fpoint (Qnil)) ==
+	  XINT (Fmarker_position (Fpoint_marker (Qt, Qnil))));
+#endif
+
+  b = current_buffer;
+
+  return noseeum_cons (noseeum_copy_marker (b->point_marker, Qnil),
+		       noseeum_copy_marker (b->mark, Qnil));
+}
+
+Lisp_Object
+save_excursion_restore (Lisp_Object info)
+{
+  Lisp_Object buffer = Fmarker_buffer (XCAR (info));
+
+  /* If buffer being returned to is now deleted, avoid error --
+     otherwise could get error here while unwinding to top level and
+     crash.  In that case, Fmarker_buffer returns nil now.  */
+  if (!NILP (buffer))
+    {
+      struct buffer *buf = XBUFFER (buffer);
+      struct gcpro gcpro1;
+      GCPRO1 (info);
+      set_buffer_internal (buf);
+      Fgoto_char (XCAR (info), buffer);
+      Fset_marker (buf->mark, XCDR (info), buffer);
+
+#if 0 /* We used to make the current buffer visible in the selected window
+	 if that was true previously.  That avoids some anomalies.
+	 But it creates others, and it wasn't documented, and it is simpler
+	 and cleaner never to alter the window/buffer connections.  */
+      /* I'm certain some code somewhere depends on this behavior. --jwz */
+      /* Even if it did, it certainly doesn't matter anymore, because
+         this has been the behavior for countless XEmacs releases
+         now.  --hniksic */
+      if (visible
+	  && (current_buffer != XBUFFER (XWINDOW (selected_window)->buffer)))
+	switch_to_buffer (Fcurrent_buffer (), Qnil);
+#endif
+
+      UNGCPRO;
+    }
+
+  /* Free all the junk we allocated, so that a `save-excursion' comes
+     for free in terms of GC junk. */
+  free_marker (XMARKER (XCAR (info)));
+  free_marker (XMARKER (XCDR (info)));
+  free_cons (XCONS (info));
+  return Qnil;
+}
+
+DEFUN ("save-excursion", Fsave_excursion, 0, UNEVALLED, 0, /*
+Save point, mark, and current buffer; execute BODY; restore those things.
+Executes BODY just like `progn'.
+The values of point, mark and the current buffer are restored
+even in case of abnormal exit (throw or error).
+*/
+       (args))
+{
+  /* This function can GC */
+  int speccount = specpdl_depth ();
+
+  record_unwind_protect (save_excursion_restore, save_excursion_save ());
+
+  return unbind_to (speccount, Fprogn (args));
+}
+
+Lisp_Object
+save_current_buffer_restore (Lisp_Object buffer)
+{
+  struct buffer *buf = XBUFFER (buffer);
+  /* Avoid signaling an error if the buffer is no longer alive.  This
+     is for consistency with save-excursion.  */
+  if (BUFFER_LIVE_P (buf))
+    set_buffer_internal (buf);
+  return Qnil;
+}
+
+DEFUN ("save-current-buffer", Fsave_current_buffer, 0, UNEVALLED, 0, /*
+Save the current buffer; execute BODY; restore the current buffer.
+Executes BODY just like `progn'.
+*/
+       (args))
+{
+  /* This function can GC */
+  int speccount = specpdl_depth ();
+
+  record_unwind_protect (save_current_buffer_restore, Fcurrent_buffer ());
+
+  return unbind_to (speccount, Fprogn (args));
+}
+
+DEFUN ("buffer-size", Fbuffer_size, 0, 1, 0, /*
+Return the number of characters in BUFFER.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return make_int (BUF_SIZE (b));
+}
+
+DEFUN ("point-min", Fpoint_min, 0, 1, 0, /*
+Return the minimum permissible value of point in BUFFER.
+This is 1, unless narrowing (a buffer restriction) is in effect.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return make_int (BUF_BEGV (b));
+}
+
+DEFUN ("point-min-marker", Fpoint_min_marker, 0, 1, 0, /*
+Return a marker to the minimum permissible value of point in BUFFER.
+This is the beginning, unless narrowing (a buffer restriction) is in effect.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return buildmark (BUF_BEGV (b), make_buffer (b));
+}
+
+DEFUN ("point-max", Fpoint_max, 0, 1, 0, /*
+Return the maximum permissible value of point in BUFFER.
+This is (1+ (buffer-size)), unless narrowing (a buffer restriction)
+is in effect, in which case it is less.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return make_int (BUF_ZV (b));
+}
+
+DEFUN ("point-max-marker", Fpoint_max_marker, 0, 1, 0, /*
+Return a marker to the maximum permissible value of point BUFFER.
+This is (1+ (buffer-size)), unless narrowing (a buffer restriction)
+is in effect, in which case it is less.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return buildmark (BUF_ZV (b), make_buffer (b));
+}
+
+DEFUN ("following-char", Ffollowing_char, 0, 1, 0, /*
+Return the character following point.
+At the end of the buffer or accessible region, return 0.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  if (BUF_PT (b) >= BUF_ZV (b))
+    return Qzero;             /* #### Gag me! */
+  else
+    return make_char (BUF_FETCH_CHAR (b, BUF_PT (b)));
+}
+
+DEFUN ("preceding-char", Fpreceding_char, 0, 1, 0, /*
+Return the character preceding point.
+At the beginning of the buffer or accessible region, return 0.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  if (BUF_PT (b) <= BUF_BEGV (b))
+    return Qzero;             /* #### Gag me! */
+  else
+    return make_char (BUF_FETCH_CHAR (b, BUF_PT (b) - 1));
+}
+
+DEFUN ("bobp", Fbobp, 0, 1, 0, /*
+Return t if point is at the beginning of the buffer.
+If the buffer is narrowed, this means the beginning of the narrowed part.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return BUF_PT (b) == BUF_BEGV (b) ? Qt : Qnil;
+}
+
+DEFUN ("eobp", Feobp, 0, 1, 0, /*
+Return t if point is at the end of the buffer.
+If the buffer is narrowed, this means the end of the narrowed part.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return BUF_PT (b) == BUF_ZV (b) ? Qt : Qnil;
+}
+
+int
+beginning_of_line_p (struct buffer *b, Bufpos pt)
+{
+  return pt <= BUF_BEGV (b) || BUF_FETCH_CHAR (b, pt - 1) == '\n';
+}
+
+
+DEFUN ("bolp", Fbolp, 0, 1, 0, /*
+Return t if point is at the beginning of a line.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return beginning_of_line_p (b, BUF_PT (b)) ? Qt : Qnil;
+}
+
+DEFUN ("eolp", Feolp, 0, 1, 0, /*
+Return t if point is at the end of a line.
+`End of a line' includes point being at the end of the buffer.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  return (BUF_PT (b) == BUF_ZV (b) || BUF_FETCH_CHAR (b, BUF_PT (b)) == '\n')
+    ? Qt : Qnil;
+}
+
+DEFUN ("char-after", Fchar_after, 0, 2, 0, /*
+Return character in BUFFER at position POS.
+POS is an integer or a buffer pointer.
+If POS is out of range, the value is nil.
+If BUFFER is nil, the current buffer is assumed.
+if POS is nil, the value of point is assumed.
+*/
+       (pos, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  Bufpos n = (NILP (pos) ? BUF_PT (b) :
+	      get_buffer_pos_char (b, pos, GB_NO_ERROR_IF_BAD));
+
+  if (n < 0 || n == BUF_ZV (b))
+    return Qnil;
+  return make_char (BUF_FETCH_CHAR (b, n));
+}
+
+DEFUN ("char-before", Fchar_before, 0, 2, 0, /*
+Return character in BUFFER before position POS.
+POS is an integer or a buffer pointer.
+If POS is out of range, the value is nil.
+If BUFFER is nil, the current buffer is assumed.
+if POS is nil, the value of point is assumed.
+*/
+       (pos, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  Bufpos n = ((NILP (pos) ? BUF_PT (b) :
+	       get_buffer_pos_char (b, pos, GB_NO_ERROR_IF_BAD)));
+
+  n--;
+
+  if (n < BUF_BEGV (b))
+    return Qnil;
+  return make_char (BUF_FETCH_CHAR (b, n));
+}
+
+
+DEFUN ("temp-directory", Ftemp_directory, 0, 0, 0, /*
+Return the pathname to the directory to use for temporary files.
+On NT/MSDOS, this is obtained from the TEMP or TMP environment variables,
+defaulting to / if they are both undefined.
+On Unix it is obtained from TMPDIR, with /tmp as the default
+*/
+       ())
+{
+  char *tmpdir;
+#if defined(WINDOWSNT) || defined(MSDOS)
+  tmpdir = getenv ("TEMP");
+  if (!tmpdir)
+    tmpdir = getenv ("TMP");
+  if (!tmpdir)
+    tmpdir = "/";
+#else /* WINDOWSNT || MSDOS */
+ tmpdir = getenv ("TMPDIR");
+ if (!tmpdir)
+   tmpdir = "/tmp";
+#endif
+
+  return build_ext_string (tmpdir, FORMAT_FILENAME);
+}
+
+DEFUN ("user-login-name", Fuser_login_name, 0, 1, 0, /*
+Return the name under which the user logged in, as a string.
+This is based on the effective uid, not the real uid.
+Also, if the environment variable LOGNAME or USER is set,
+that determines the value of this function.
+If the optional argument UID is present, then environment variables are
+ignored and this function returns the login name for that UID, or nil.
+*/
+       (uid))
+{
+  char *returned_name;
+  uid_t local_uid;
+
+  if (!NILP (uid))
+    {
+      CHECK_INT (uid);
+      local_uid = XINT (uid);
+      returned_name = user_login_name (&local_uid);
+    }
+  else
+    {
+      returned_name = user_login_name (NULL);
+    }
+  /* #### - I believe this should return nil instead of "unknown" when pw==0
+     pw=0 is indicated by a null return from user_login_name
+  */
+  return returned_name ? build_string (returned_name) : Qnil;
+}
+
+/* This function may be called from other C routines when a
+   character string representation of the user_login_name is
+   needed but a Lisp Object is not.  The UID is passed by
+   reference.  If UID == NULL, then the USER name
+   for the user running XEmacs will be returned.  This
+   corresponds to a nil argument to Fuser_login_name.
+*/
+char*
+user_login_name (uid_t *uid)
+{
+  /* uid == NULL to return name of this user */
+  if (uid != NULL)
+    {
+      struct passwd *pw = getpwuid (*uid);
+      return pw ? pw->pw_name : NULL;
+    }
+  else
+    {
+      /* #### - when euid != uid, then LOGNAME and USER are leftovers from the
+	 old environment (I site observed behavior on sunos and linux), so the
+	 environment variables should be disregarded in that case.  --Stig */
+      char *user_name = getenv ("LOGNAME");
+      if (!user_name)
+	user_name = getenv (
+#ifdef WINDOWSNT
+			    "USERNAME" /* it's USERNAME on NT */
+#else
+			    "USER"
+#endif
+			    );
+      if (user_name)
+	return (user_name);
+      else
+	{
+	  struct passwd *pw = getpwuid (geteuid ());
+#ifdef __CYGWIN32__
+	  /* Since the Cygwin environment may not have an /etc/passwd,
+	     return "unknown" instead of the null if the username
+	     cannot be determined.
+	  */
+	  return pw ? pw->pw_name : "unknown";
+#else
+	  /* For all but Cygwin return NULL (nil) */
+	  return pw ? pw->pw_name : NULL;
+#endif
+	}
+    }
+}
+
+DEFUN ("user-real-login-name", Fuser_real_login_name, 0, 0, 0, /*
+Return the name of the user's real uid, as a string.
+This ignores the environment variables LOGNAME and USER, so it differs from
+`user-login-name' when running under `su'.
+*/
+       ())
+{
+  struct passwd *pw = getpwuid (getuid ());
+  /* #### - I believe this should return nil instead of "unknown" when pw==0 */
+
+#ifdef MSDOS
+  /* We let the real user name default to "root" because that's quite
+     accurate on MSDOG and because it lets Emacs find the init file.
+     (The DVX libraries override the Djgpp libraries here.)  */
+  Lisp_Object tem = build_string (pw ? pw->pw_name : "root");/* no gettext */
+#else
+  Lisp_Object tem = build_string (pw ? pw->pw_name : "unknown");/* no gettext */
+#endif
+  return tem;
+}
+
+DEFUN ("user-uid", Fuser_uid, 0, 0, 0, /*
+Return the effective uid of Emacs, as an integer.
+*/
+       ())
+{
+  return make_int (geteuid ());
+}
+
+DEFUN ("user-real-uid", Fuser_real_uid, 0, 0, 0, /*
+Return the real uid of Emacs, as an integer.
+*/
+       ())
+{
+  return make_int (getuid ());
+}
+
+DEFUN ("user-full-name", Fuser_full_name, 0, 1, 0, /*
+Return the full name of the user logged in, as a string.
+If the optional argument USER is given, then the full name for that
+user is returned, or nil.  USER may be either a login name or a uid.
+
+If USER is nil, and `user-full-name' contains a string, the
+value of `user-full-name' is returned.
+*/
+       (user))
+{
+  Lisp_Object user_name;
+  struct passwd *pw = NULL;
+  Lisp_Object tem;
+  const char *p, *q;
+
+  if (NILP (user) && STRINGP (Vuser_full_name))
+    return Vuser_full_name;
+
+  user_name = (STRINGP (user) ? user : Fuser_login_name (user));
+  if (!NILP (user_name))	/* nil when nonexistent UID passed as arg */
+    {
+      CONST char *user_name_ext;
+
+      /* Fuck me.  getpwnam() can call select() and (under IRIX at least)
+	 things get wedged if a SIGIO arrives during this time. */
+      GET_C_STRING_OS_DATA_ALLOCA (user_name, user_name_ext);
+      slow_down_interrupts ();
+      pw = (struct passwd *) getpwnam (user_name_ext);
+      speed_up_interrupts ();
+    }
+
+  /* #### - Stig sez: this should return nil instead of "unknown" when pw==0 */
+  /* Ben sez: bad idea because it's likely to break something */
+#ifndef AMPERSAND_FULL_NAME
+  p = ((pw) ? USER_FULL_NAME : "unknown"); /* don't gettext */
+  q = strchr (p, ',');
+#else
+  p = ((pw) ? USER_FULL_NAME : "unknown"); /* don't gettext */
+  q = strchr (p, ',');
+#endif
+  tem = ((!NILP (user) && !pw)
+	 ? Qnil
+	 : make_ext_string ((Extbyte *) p, (q ? q - p : strlen (p)),
+			    FORMAT_OS));
+
+#ifdef AMPERSAND_FULL_NAME
+  if (!NILP (tem))
+    {
+      p = (char *) XSTRING_DATA (tem);
+      q = strchr (p, '&');
+      /* Substitute the login name for the &, upcasing the first character.  */
+      if (q)
+	{
+	  char *r = (char *) alloca (strlen (p) + XSTRING_LENGTH (user_name) + 1);
+	  memcpy (r, p, q - p);
+	  r[q - p] = 0;
+	  strcat (r, (char *) XSTRING_DATA (user_name));
+	  /* #### current_buffer dependency! */
+	  r[q - p] = UPCASE (current_buffer, r[q - p]);
+	  strcat (r, q + 1);
+	  tem = build_string (r);
+	}
+    }
+#endif /* AMPERSAND_FULL_NAME */
+
+  return tem;
+}
+
+static char *cached_home_directory;
+
+void
+uncache_home_directory (void)
+{
+  cached_home_directory = NULL;	/* in some cases, this may cause the leaking
+				   of a few bytes */
+}
+
+/* Returns the home directory, in external format */
+char *
+get_home_directory (void)
+{
+  int output_home_warning = 0;
+
+  if (cached_home_directory == NULL)
+    {
+      if ((cached_home_directory = getenv("HOME")) == NULL)
+	{
+#if defined(WINDOWSNT) && !defined(__CYGWIN32__)
+	  char	*homedrive, *homepath;
+
+	  if ((homedrive = getenv("HOMEDRIVE")) != NULL &&
+	      (homepath = getenv("HOMEPATH")) != NULL)
+	    {
+	      cached_home_directory =
+		(char *) xmalloc(strlen(homedrive) + strlen(homepath) + 1);
+	      sprintf(cached_home_directory, "%s%s", homedrive, homepath);
+	    }
+	  else
+	    {
+# if 1
+	      /*
+	       * Use the current directory.
+	       * This preserves the existing XEmacs behavior, but is different
+	       * from NT Emacs.
+	       */
+	      if (initial_directory[0] != '\0')
+		{
+		  cached_home_directory = initial_directory;
+		}
+	      else
+		{
+		  /* This will probably give the wrong value */
+		  cached_home_directory = getcwd (NULL, 0);
+		}
+# else
+	      /*
+	       * This is NT Emacs behavior
+	       */
+	      cached_home_directory = "C:\\";
+	      output_home_warning = 1;
+# endif
+	    }
+#else	/* !WINDOWSNT */
+	  /*
+	   * Unix, typically.
+	   * Using "/" isn't quite right, but what should we do?
+	   * We probably should try to extract pw_dir from /etc/passwd,
+	   * before falling back to this.
+	   */
+	  cached_home_directory = "/";
+	  output_home_warning = 1;
+#endif	/* !WINDOWSNT */
+	}
+      if (initialized && output_home_warning)
+	{
+	  warn_when_safe (Quser_files_and_directories, Qwarning, "\n"
+"	XEmacs was unable to determine a good value for the user's $HOME\n"
+"	directory, and will be using the value:\n"
+"		%s\n"
+"	This is probably incorrect.",
+			  cached_home_directory
+			  );
+	}
+    }
+  return cached_home_directory;
+}
+
+DEFUN ("user-home-directory", Fuser_home_directory, 0, 0, 0, /*
+Return the user's home directory, as a string.
+*/
+       ())
+{
+  char *path = get_home_directory ();
+
+  return path == NULL ? Qnil :
+    Fexpand_file_name (Fsubstitute_in_file_name
+		       (build_ext_string (path, FORMAT_FILENAME)),
+		       Qnil);
+}
+
+DEFUN ("system-name", Fsystem_name, 0, 0, 0, /*
+Return the name of the machine you are running on, as a string.
+*/
+       ())
+{
+    return Fcopy_sequence (Vsystem_name);
+}
+
+DEFUN ("emacs-pid", Femacs_pid, 0, 0, 0, /*
+Return the process ID of Emacs, as an integer.
+*/
+       ())
+{
+  return make_int (getpid ());
+}
+
+DEFUN ("current-time", Fcurrent_time, 0, 0, 0, /*
+Return the current time, as the number of seconds since 1970-01-01 00:00:00.
+The time is returned as a list of three integers.  The first has the
+most significant 16 bits of the seconds, while the second has the
+least significant 16 bits.  The third integer gives the microsecond
+count.
+
+The microsecond count is zero on systems that do not provide
+resolution finer than a second.
+*/
+       ())
+{
+  EMACS_TIME t;
+
+  EMACS_GET_TIME (t);
+  return list3 (make_int ((EMACS_SECS (t) >> 16) & 0xffff),
+		make_int ((EMACS_SECS (t) >> 0)  & 0xffff),
+		make_int (EMACS_USECS (t)));
+}
+
+DEFUN ("current-process-time", Fcurrent_process_time, 0, 0, 0, /*
+Return the amount of time used by this XEmacs process so far.
+The return value is a list of three floating-point numbers, expressing
+the user, system, and real times used by the process.  The user time
+measures the time actually spent by the CPU executing the code in this
+process.  The system time measures time spent by the CPU executing kernel
+code on behalf of this process (e.g. I/O requests made by the process).
+
+Note that the user and system times measure processor time, as opposed
+to real time, and only accrue when the processor is actually doing
+something: Time spent in an idle wait (waiting for user events to come
+in or for I/O on a disk drive or other device to complete) does not
+count.  Thus, the user and system times will often be considerably
+less than the real time.
+
+Some systems do not allow the user and system times to be distinguished.
+In this case, the user time will be the total processor time used by
+the process, and the system time will be 0.
+
+Some systems do not allow the real and processor times to be distinguished.
+In this case, the user and real times will be the same and the system
+time will be 0.
+*/
+       ())
+{
+  double user, sys, real;
+
+  get_process_times (&user, &sys, &real);
+  return list3 (make_float (user), make_float (sys), make_float (real));
+}
+
+
+int lisp_to_time (Lisp_Object specified_time, time_t *result);
+int
+lisp_to_time (Lisp_Object specified_time, time_t *result)
+{
+  Lisp_Object high, low;
+
+  if (NILP (specified_time))
+    return time (result) != -1;
+
+  CHECK_CONS (specified_time);
+  high = XCAR (specified_time);
+  low  = XCDR (specified_time);
+  if (CONSP (low))
+    low = XCAR (low);
+  CHECK_INT (high);
+  CHECK_INT (low);
+  *result = (XINT (high) << 16) + (XINT (low) & 0xffff);
+  return *result >> 16 == XINT (high);
+}
+
+Lisp_Object time_to_lisp (time_t the_time);
+Lisp_Object
+time_to_lisp (time_t the_time)
+{
+  unsigned int item = (unsigned int) the_time;
+  return Fcons (make_int (item >> 16), make_int (item & 0xffff));
+}
+
+size_t emacs_strftime (char *string, size_t max, CONST char *format,
+		       CONST struct tm *tm);
+static long difftm (CONST struct tm *a, CONST struct tm *b);
+
+
+DEFUN ("format-time-string", Fformat_time_string, 1, 2, 0, /*
+Use FORMAT-STRING to format the time TIME.
+TIME is specified as (HIGH LOW . IGNORED) or (HIGH . LOW), as from
+`current-time' and `file-attributes'.  If TIME is not specified it
+defaults to the current time.
+FORMAT-STRING may contain %-sequences to substitute parts of the time.
+%a is replaced by the abbreviated name of the day of week.
+%A is replaced by the full name of the day of week.
+%b is replaced by the abbreviated name of the month.
+%B is replaced by the full name of the month.
+%c is a synonym for "%x %X".
+%C is a locale-specific synonym, which defaults to "%A, %B %e, %Y" in the C locale.
+%d is replaced by the day of month, zero-padded.
+%D is a synonym for "%m/%d/%y".
+%e is replaced by the day of month, blank-padded.
+%h is a synonym for "%b".
+%H is replaced by the hour (00-23).
+%I is replaced by the hour (00-12).
+%j is replaced by the day of the year (001-366).
+%k is replaced by the hour (0-23), blank padded.
+%l is replaced by the hour (1-12), blank padded.
+%m is replaced by the month (01-12).
+%M is replaced by the minute (00-59).
+%n is a synonym for "\\n".
+%p is replaced by AM or PM, as appropriate.
+%r is a synonym for "%I:%M:%S %p".
+%R is a synonym for "%H:%M".
+%s is replaced by the time in seconds since 00:00:00, Jan 1, 1970 (a
+      nonstandard extension)
+%S is replaced by the second (00-60).
+%t is a synonym for "\\t".
+%T is a synonym for "%H:%M:%S".
+%U is replaced by the week of the year (00-53), first day of week is Sunday.
+%w is replaced by the day of week (0-6), Sunday is day 0.
+%W is replaced by the week of the year (00-53), first day of week is Monday.
+%x is a locale-specific synonym, which defaults to "%D" in the C locale.
+%X is a locale-specific synonym, which defaults to "%T" in the C locale.
+%y is replaced by the year without century (00-99).
+%Y is replaced by the year with century.
+%Z is replaced by the time zone abbreviation.
+
+The number of options reflects the `strftime' function.
+
+BUG: If the charset used by the current locale is not ISO 8859-1, the
+characters appearing in the day and month names may be incorrect.
+*/
+       (format_string, time_))
+{
+  time_t value;
+  size_t size;
+
+  CHECK_STRING (format_string);
+
+  if (! lisp_to_time (time_, &value))
+    error ("Invalid time specification");
+
+  /* This is probably enough.  */
+  size = XSTRING_LENGTH (format_string) * 6 + 50;
+
+  while (1)
+    {
+      char *buf = (char *) alloca (size);
+      *buf = 1;
+      if (emacs_strftime (buf, size,
+			  (CONST char *) XSTRING_DATA (format_string),
+			  localtime (&value))
+	  || !*buf)
+	return build_ext_string (buf, FORMAT_BINARY);
+      /* If buffer was too small, make it bigger.  */
+      size *= 2;
+    }
+}
+
+DEFUN ("decode-time", Fdecode_time, 0, 1, 0, /*
+Decode a time value as (SEC MINUTE HOUR DAY MONTH YEAR DOW DST ZONE).
+The optional SPECIFIED-TIME should be a list of (HIGH LOW . IGNORED)
+or (HIGH . LOW), as from `current-time' and `file-attributes', or `nil'
+to use the current time.  The list has the following nine members:
+SEC is an integer between 0 and 60; SEC is 60 for a leap second, which
+only some operating systems support.  MINUTE is an integer between 0 and 59.
+HOUR is an integer between 0 and 23.  DAY is an integer between 1 and 31.
+MONTH is an integer between 1 and 12.  YEAR is an integer indicating the
+four-digit year.  DOW is the day of week, an integer between 0 and 6, where
+0 is Sunday.  DST is t if daylight savings time is effect, otherwise nil.
+ZONE is an integer indicating the number of seconds east of Greenwich.
+\(Note that Common Lisp has different meanings for DOW and ZONE.)
+*/
+       (specified_time))
+{
+  time_t time_spec;
+  struct tm save_tm;
+  struct tm *decoded_time;
+  Lisp_Object list_args[9];
+
+  if (! lisp_to_time (specified_time, &time_spec))
+    error ("Invalid time specification");
+
+  decoded_time = localtime (&time_spec);
+  list_args[0] = make_int (decoded_time->tm_sec);
+  list_args[1] = make_int (decoded_time->tm_min);
+  list_args[2] = make_int (decoded_time->tm_hour);
+  list_args[3] = make_int (decoded_time->tm_mday);
+  list_args[4] = make_int (decoded_time->tm_mon + 1);
+  list_args[5] = make_int (decoded_time->tm_year + 1900);
+  list_args[6] = make_int (decoded_time->tm_wday);
+  list_args[7] = (decoded_time->tm_isdst)? Qt : Qnil;
+
+  /* Make a copy, in case gmtime modifies the struct.  */
+  save_tm = *decoded_time;
+  decoded_time = gmtime (&time_spec);
+  if (decoded_time == 0)
+    list_args[8] = Qnil;
+  else
+    list_args[8] = make_int (difftm (&save_tm, decoded_time));
+  return Flist (9, list_args);
+}
+
+static void set_time_zone_rule (char *tzstring);
+
+DEFUN ("encode-time", Fencode_time, 6, MANY, 0, /*
+  Convert SECOND, MINUTE, HOUR, DAY, MONTH, YEAR and ZONE to internal time.
+This is the reverse operation of `decode-time', which see.
+ZONE defaults to the current time zone rule.  This can
+be a string (as from `set-time-zone-rule'), or it can be a list
+\(as from `current-time-zone') or an integer (as from `decode-time')
+applied without consideration for daylight savings time.
+
+You can pass more than 7 arguments; then the first six arguments
+are used as SECOND through YEAR, and the *last* argument is used as ZONE.
+The intervening arguments are ignored.
+This feature lets (apply 'encode-time (decode-time ...)) work.
+
+Out-of-range values for SEC, MINUTE, HOUR, DAY, or MONTH are allowed;
+for example, a DAY of 0 means the day preceding the given month.
+Year numbers less than 100 are treated just like other year numbers.
+If you want them to stand for years in this century, you must do that yourself.
+*/
+       (int nargs, Lisp_Object *args))
+{
+  time_t the_time;
+  struct tm tm;
+  Lisp_Object zone = (nargs > 6) ? args[nargs - 1] : Qnil;
+
+  CHECK_INT (*args); tm.tm_sec  = XINT (*args++);	/* second */
+  CHECK_INT (*args); tm.tm_min  = XINT (*args++);	/* minute */
+  CHECK_INT (*args); tm.tm_hour = XINT (*args++);	/* hour */
+  CHECK_INT (*args); tm.tm_mday = XINT (*args++);	/* day */
+  CHECK_INT (*args); tm.tm_mon  = XINT (*args++) - 1;	/* month */
+  CHECK_INT (*args); tm.tm_year = XINT (*args++) - 1900;/* year */
+
+  tm.tm_isdst = -1;
+
+  if (CONSP (zone))
+    zone = XCAR (zone);
+  if (NILP (zone))
+    the_time = mktime (&tm);
+  else
+    {
+      char tzbuf[100];
+      char *tzstring;
+      char **oldenv = environ, **newenv;
+
+      if (STRINGP (zone))
+	tzstring = (char *) XSTRING_DATA (zone);
+      else if (INTP (zone))
+	{
+	  int abszone = abs (XINT (zone));
+	  sprintf (tzbuf, "XXX%s%d:%02d:%02d", "-" + (XINT (zone) < 0),
+		   abszone / (60*60), (abszone/60) % 60, abszone % 60);
+	  tzstring = tzbuf;
+	}
+      else
+	error ("Invalid time zone specification");
+
+      /* Set TZ before calling mktime; merely adjusting mktime's returned
+	 value doesn't suffice, since that would mishandle leap seconds.  */
+      set_time_zone_rule (tzstring);
+
+      the_time = mktime (&tm);
+
+      /* Restore TZ to previous value.  */
+      newenv = environ;
+      environ = oldenv;
+      free (newenv);
+#ifdef LOCALTIME_CACHE
+      tzset ();
+#endif
+    }
+
+  if (the_time == (time_t) -1)
+    error ("Specified time is not representable");
+
+  return wasteful_word_to_lisp (the_time);
+}
+
+DEFUN ("current-time-string", Fcurrent_time_string, 0, 1, 0, /*
+Return the current time, as a human-readable string.
+Programs can use this function to decode a time,
+since the number of columns in each field is fixed.
+The format is `Sun Sep 16 01:03:52 1973'.
+If an argument is given, it specifies a time to format
+instead of the current time.  The argument should have the form:
+  (HIGH . LOW)
+or the form:
+  (HIGH LOW . IGNORED).
+Thus, you can use times obtained from `current-time'
+and from `file-attributes'.
+*/
+       (specified_time))
+{
+  time_t value;
+  char buf[30];
+  char *tem;
+
+  if (! lisp_to_time (specified_time, &value))
+    value = -1;
+  tem = (char *) ctime (&value);
+
+  strncpy (buf, tem, 24);
+  buf[24] = 0;
+
+  return build_ext_string (buf, FORMAT_BINARY);
+}
+
+#define TM_YEAR_ORIGIN 1900
+
+/* Yield A - B, measured in seconds.  */
+static long
+difftm (CONST struct tm *a, CONST struct tm *b)
+{
+  int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
+  int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
+  /* Some compilers can't handle this as a single return statement.  */
+  long days = (
+	      /* difference in day of year */
+	      a->tm_yday - b->tm_yday
+	      /* + intervening leap days */
+	      +  ((ay >> 2) - (by >> 2))
+	      -  (ay/100 - by/100)
+	      +  ((ay/100 >> 2) - (by/100 >> 2))
+	      /* + difference in years * 365 */
+	      +  (long)(ay-by) * 365
+	      );
+  return (60*(60*(24*days + (a->tm_hour - b->tm_hour))
+	      + (a->tm_min - b->tm_min))
+	  + (a->tm_sec - b->tm_sec));
+}
+
+DEFUN ("current-time-zone", Fcurrent_time_zone, 0, 1, 0, /*
+Return the offset and name for the local time zone.
+This returns a list of the form (OFFSET NAME).
+OFFSET is an integer number of seconds ahead of UTC (east of Greenwich).
+    A negative value means west of Greenwich.
+NAME is a string giving the name of the time zone.
+If an argument is given, it specifies when the time zone offset is determined
+instead of using the current time.  The argument should have the form:
+  (HIGH . LOW)
+or the form:
+  (HIGH LOW . IGNORED).
+Thus, you can use times obtained from `current-time'
+and from `file-attributes'.
+
+Some operating systems cannot provide all this information to Emacs;
+in this case, `current-time-zone' returns a list containing nil for
+the data it can't find.
+*/
+       (specified_time))
+{
+  time_t value;
+  struct tm *t = NULL;
+
+  if (lisp_to_time (specified_time, &value)
+      && (t = gmtime (&value)) != 0)
+    {
+      struct tm gmt = *t;	/* Make a copy, in case localtime modifies *t.  */
+      long offset;
+      char *s, buf[6];
+
+      t = localtime (&value);
+      offset = difftm (t, &gmt);
+      s = 0;
+#ifdef HAVE_TM_ZONE
+      if (t->tm_zone)
+	s = (char *)t->tm_zone;
+#else /* not HAVE_TM_ZONE */
+#ifdef HAVE_TZNAME
+      if (t->tm_isdst == 0 || t->tm_isdst == 1)
+	s = tzname[t->tm_isdst];
+#endif
+#endif /* not HAVE_TM_ZONE */
+      if (!s)
+	{
+	  /* No local time zone name is available; use "+-NNNN" instead.  */
+	  int am = (offset < 0 ? -offset : offset) / 60;
+	  sprintf (buf, "%c%02d%02d", (offset < 0 ? '-' : '+'), am/60, am%60);
+	  s = buf;
+	}
+      return list2 (make_int (offset), build_string (s));
+    }
+  else
+    return list2 (Qnil, Qnil);
+}
+
+#ifdef LOCALTIME_CACHE
+
+/* These two values are known to load tz files in buggy implementations,
+   i.e. Solaris 1 executables running under either Solaris 1 or Solaris 2.
+   Their values shouldn't matter in non-buggy implementations.
+   We don't use string literals for these strings,
+   since if a string in the environment is in readonly
+   storage, it runs afoul of bugs in SVR4 and Solaris 2.3.
+   See Sun bugs 1113095 and 1114114, ``Timezone routines
+   improperly modify environment''.  */
+
+static char set_time_zone_rule_tz1[] = "TZ=GMT+0";
+static char set_time_zone_rule_tz2[] = "TZ=GMT+1";
+
+#endif
+
+/* Set the local time zone rule to TZSTRING.
+   This allocates memory into `environ', which it is the caller's
+   responsibility to free.  */
+static void
+set_time_zone_rule (char *tzstring)
+{
+  int envptrs;
+  char **from, **to, **newenv;
+
+  for (from = environ; *from; from++)
+    continue;
+  envptrs = from - environ + 2;
+  newenv = to = (char **) xmalloc (envptrs * sizeof (char *)
+				   + (tzstring ? strlen (tzstring) + 4 : 0));
+  if (tzstring)
+    {
+      char *t = (char *) (to + envptrs);
+      strcpy (t, "TZ=");
+      strcat (t, tzstring);
+      *to++ = t;
+    }
+
+  for (from = environ; *from; from++)
+    if (strncmp (*from, "TZ=", 3) != 0)
+      *to++ = *from;
+  *to = 0;
+
+  environ = newenv;
+
+#ifdef LOCALTIME_CACHE
+  {
+    /* In SunOS 4.1.3_U1 and 4.1.4, if TZ has a value like
+       "US/Pacific" that loads a tz file, then changes to a value like
+       "XXX0" that does not load a tz file, and then changes back to
+       its original value, the last change is (incorrectly) ignored.
+       Also, if TZ changes twice in succession to values that do
+       not load a tz file, tzset can dump core (see Sun bug#1225179).
+       The following code works around these bugs.  */
+
+    if (tzstring)
+      {
+	/* Temporarily set TZ to a value that loads a tz file
+	   and that differs from tzstring.  */
+	char *tz = *newenv;
+	*newenv = (strcmp (tzstring, set_time_zone_rule_tz1 + 3) == 0
+		   ? set_time_zone_rule_tz2 : set_time_zone_rule_tz1);
+	tzset ();
+	*newenv = tz;
+      }
+    else
+      {
+	/* The implied tzstring is unknown, so temporarily set TZ to
+	   two different values that each load a tz file.  */
+	*to = set_time_zone_rule_tz1;
+	to[1] = 0;
+	tzset ();
+	*to = set_time_zone_rule_tz2;
+	tzset ();
+	*to = 0;
+      }
+
+    /* Now TZ has the desired value, and tzset can be invoked safely.  */
+  }
+
+  tzset ();
+#endif
+}
+
+DEFUN ("set-time-zone-rule", Fset_time_zone_rule, 1, 1, 0, /*
+Set the local time zone using TZ, a string specifying a time zone rule.
+If TZ is nil, use implementation-defined default time zone information.
+*/
+       (tz))
+{
+  char *tzstring;
+
+  if (NILP (tz))
+    tzstring = 0;
+  else
+    {
+      CHECK_STRING (tz);
+      tzstring = (char *) XSTRING_DATA (tz);
+    }
+
+  set_time_zone_rule (tzstring);
+  if (environbuf)
+    xfree (environbuf);
+  environbuf = environ;
+
+  return Qnil;
+}
+
+
+void
+buffer_insert1 (struct buffer *buf, Lisp_Object arg)
+{
+  /* This function can GC */
+  struct gcpro gcpro1;
+  GCPRO1 (arg);
+ retry:
+  if (CHAR_OR_CHAR_INTP (arg))
+    {
+      buffer_insert_emacs_char (buf, XCHAR_OR_CHAR_INT (arg));
+    }
+  else if (STRINGP (arg))
+    {
+      buffer_insert_lisp_string (buf, arg);
+    }
+  else
+    {
+      arg = wrong_type_argument (Qchar_or_string_p, arg);
+      goto retry;
+    }
+  zmacs_region_stays = 0;
+  UNGCPRO;
+}
+
+
+/* Callers passing one argument to Finsert need not gcpro the
+   argument "array", since the only element of the array will
+   not be used after calling insert_emacs_char or insert_lisp_string,
+   so we don't care if it gets trashed.  */
+
+DEFUN ("insert", Finsert, 0, MANY, 0, /*
+Insert the arguments, either strings or characters, at point.
+Point moves forward so that it ends up after the inserted text.
+Any other markers at the point of insertion remain before the text.
+If a string has non-null string-extent-data, new extents will be created.
+*/
+       (int nargs, Lisp_Object *args))
+{
+  /* This function can GC */
+  REGISTER int argnum;
+
+  for (argnum = 0; argnum < nargs; argnum++)
+    {
+      buffer_insert1 (current_buffer, args[argnum]);
+    }
+
+  return Qnil;
+}
+
+DEFUN ("insert-before-markers", Finsert_before_markers, 0, MANY, 0, /*
+Insert strings or characters at point, relocating markers after the text.
+Point moves forward so that it ends up after the inserted text.
+Any other markers at the point of insertion also end up after the text.
+*/
+       (int nargs, Lisp_Object *args))
+{
+  /* This function can GC */
+  REGISTER int argnum;
+  REGISTER Lisp_Object tem;
+
+  for (argnum = 0; argnum < nargs; argnum++)
+    {
+      tem = args[argnum];
+    retry:
+      if (CHAR_OR_CHAR_INTP (tem))
+	{
+	  buffer_insert_emacs_char_1 (current_buffer, -1,
+				      XCHAR_OR_CHAR_INT (tem),
+				      INSDEL_BEFORE_MARKERS);
+	}
+      else if (STRINGP (tem))
+	{
+	  buffer_insert_lisp_string_1 (current_buffer, -1, tem,
+				       INSDEL_BEFORE_MARKERS);
+	}
+      else
+	{
+	  tem = wrong_type_argument (Qchar_or_string_p, tem);
+	  goto retry;
+	}
+    }
+  zmacs_region_stays = 0;
+  return Qnil;
+}
+
+DEFUN ("insert-string", Finsert_string, 1, 2, 0, /*
+Insert STRING into BUFFER at BUFFER's point.
+Point moves forward so that it ends up after the inserted text.
+Any other markers at the point of insertion remain before the text.
+If a string has non-null string-extent-data, new extents will be created.
+BUFFER defaults to the current buffer.
+*/
+       (string, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  CHECK_STRING (string);
+  buffer_insert_lisp_string (b, string);
+  zmacs_region_stays = 0;
+  return Qnil;
+}
+
+/* Third argument in FSF is INHERIT:
+
+"The optional third arg INHERIT, if non-nil, says to inherit text properties
+from adjoining text, if those properties are sticky."
+
+Jamie thinks this is bogus. */
+
+
+DEFUN ("insert-char", Finsert_char, 1, 4, 0, /*
+Insert COUNT (second arg) copies of CHR (first arg).
+Point and all markers are affected as in the function `insert'.
+COUNT defaults to 1 if omitted.
+The optional third arg IGNORED is INHERIT under FSF Emacs.
+This is highly bogus, however, and XEmacs always behaves as if
+`t' were passed to INHERIT.
+The optional fourth arg BUFFER specifies the buffer to insert the
+text into.  If BUFFER is nil, the current buffer is assumed.
+*/
+       (chr, count, ignored, buffer))
+{
+  /* This function can GC */
+  REGISTER Bufbyte *string;
+  REGISTER int slen;
+  REGISTER int i, j;
+  REGISTER Bytecount n;
+  REGISTER Bytecount charlen;
+  Bufbyte str[MAX_EMCHAR_LEN];
+  struct buffer *b = decode_buffer (buffer, 1);
+  int cou;
+
+  CHECK_CHAR_COERCE_INT (chr);
+  if (NILP (count))
+    cou = 1;
+  else
+    {
+      CHECK_INT (count);
+      cou = XINT (count);
+    }
+
+  charlen = set_charptr_emchar (str, XCHAR (chr));
+  n = cou * charlen;
+  if (n <= 0)
+    return Qnil;
+  slen = min (n, 768);
+  string = alloca_array (Bufbyte, slen);
+  /* Write as many copies of the character into the temp string as will fit. */
+  for (i = 0; i + charlen <= slen; i += charlen)
+    for (j = 0; j < charlen; j++)
+      string[i + j] = str[j];
+  slen = i;
+  while (n >= slen)
+    {
+      buffer_insert_raw_string (b, string, slen);
+      n -= slen;
+    }
+  if (n > 0)
+#if 0 /* FSFmacs bogosity */
+    {
+      if (!NILP (inherit))
+	insert_and_inherit (string, n);
+      else
+	insert (string, n);
+    }
+#else
+    buffer_insert_raw_string (b, string, n);
+#endif
+
+  zmacs_region_stays = 0;
+  return Qnil;
+}
+
+
+/* Making strings from buffer contents.  */
+
+DEFUN ("buffer-substring", Fbuffer_substring, 0, 3, 0, /*
+Return the contents of part of BUFFER as a string.
+The two arguments START and END are character positions;
+they can be in either order.  If omitted, they default to the beginning
+and end of BUFFER, respectively.
+If there are duplicable extents in the region, the string remembers
+them in its extent data.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (start, end, buffer))
+{
+  /* This function can GC */
+  Bufpos begv, zv;
+  struct buffer *b = decode_buffer (buffer, 1);
+
+  get_buffer_range_char (b, start, end, &begv, &zv, GB_ALLOW_NIL);
+  return make_string_from_buffer (b, begv, zv - begv);
+}
+
+/* It might make more sense to name this
+   `buffer-substring-no-extents', but this name is FSFmacs-compatible,
+   and what the function does is probably good enough for what the
+   user-code will typically want to use it for. */
+DEFUN ("buffer-substring-no-properties", Fbuffer_substring_no_properties, 0, 3, 0, /*
+Return the text from BEG to END, as a string, without copying the extents.
+*/
+       (start, end, buffer))
+{
+  /* This function can GC */
+  Bufpos begv, zv;
+  struct buffer *b = decode_buffer (buffer, 1);
+
+  get_buffer_range_char (b, start, end, &begv, &zv, GB_ALLOW_NIL);
+  return make_string_from_buffer_no_extents (b, begv, zv - begv);
+}
+
+DEFUN ("insert-buffer-substring", Finsert_buffer_substring, 1, 3, 0, /*
+Insert before point a substring of the contents of buffer BUFFER.
+BUFFER may be a buffer or a buffer name.
+Arguments START and END are character numbers specifying the substring.
+They default to the beginning and the end of BUFFER.
+*/
+       (buffer, start, end))
+{
+  /* This function can GC */
+  Bufpos b, e;
+  struct buffer *bp;
+
+  bp = XBUFFER (get_buffer (buffer, 1));
+  get_buffer_range_char (bp, start, end, &b, &e, GB_ALLOW_NIL);
+
+  if (b < e)
+    buffer_insert_from_buffer (current_buffer, bp, b, e - b);
+
+  return Qnil;
+}
+
+DEFUN ("compare-buffer-substrings", Fcompare_buffer_substrings, 6, 6, 0, /*
+Compare two substrings of two buffers; return result as number.
+the value is -N if first string is less after N-1 chars,
++N if first string is greater after N-1 chars, or 0 if strings match.
+Each substring is represented as three arguments: BUFFER, START and END.
+That makes six args in all, three for each substring.
+
+The value of `case-fold-search' in the current buffer
+determines whether case is significant or ignored.
+*/
+       (buffer1, start1, end1, buffer2, start2, end2))
+{
+  Bufpos begp1, endp1, begp2, endp2;
+  REGISTER Charcount len1, len2, length, i;
+  struct buffer *bp1, *bp2;
+  Lisp_Object trt = ((!NILP (current_buffer->case_fold_search)) ?
+		     current_buffer->case_canon_table : Qnil);
+
+  /* Find the first buffer and its substring.  */
+
+  bp1 = decode_buffer (buffer1, 1);
+  get_buffer_range_char (bp1, start1, end1, &begp1, &endp1, GB_ALLOW_NIL);
+
+  /* Likewise for second substring.  */
+
+  bp2 = decode_buffer (buffer2, 1);
+  get_buffer_range_char (bp2, start2, end2, &begp2, &endp2, GB_ALLOW_NIL);
+
+  len1 = endp1 - begp1;
+  len2 = endp2 - begp2;
+  length = len1;
+  if (len2 < length)
+    length = len2;
+
+  for (i = 0; i < length; i++)
+    {
+      Emchar c1 = BUF_FETCH_CHAR (bp1, begp1 + i);
+      Emchar c2 = BUF_FETCH_CHAR (bp2, begp2 + i);
+      if (!NILP (trt))
+	{
+	  c1 = TRT_TABLE_OF (trt, c1);
+	  c2 = TRT_TABLE_OF (trt, c2);
+	}
+      if (c1 < c2)
+	return make_int (- 1 - i);
+      if (c1 > c2)
+	return make_int (i + 1);
+    }
+
+  /* The strings match as far as they go.
+     If one is shorter, that one is less.  */
+  if (length < len1)
+    return make_int (length + 1);
+  else if (length < len2)
+    return make_int (- length - 1);
+
+  /* Same length too => they are equal.  */
+  return Qzero;
+}
+
+
+static Lisp_Object
+subst_char_in_region_unwind (Lisp_Object arg)
+{
+  XBUFFER (XCAR (arg))->undo_list = XCDR (arg);
+  return Qnil;
+}
+
+static Lisp_Object
+subst_char_in_region_unwind_1 (Lisp_Object arg)
+{
+  XBUFFER (XCAR (arg))->filename = XCDR (arg);
+  return Qnil;
+}
+
+DEFUN ("subst-char-in-region", Fsubst_char_in_region, 4, 5, 0, /*
+From START to END, replace FROMCHAR with TOCHAR each time it occurs.
+If optional arg NOUNDO is non-nil, don't record this change for undo
+and don't mark the buffer as really changed.
+*/
+  (start, end, fromchar, tochar, noundo))
+{
+  /* This function can GC */
+  Bufpos pos, stop;
+  Emchar fromc, toc;
+  int mc_count;
+  struct buffer *buf = current_buffer;
+  int count = specpdl_depth ();
+
+  get_buffer_range_char (buf, start, end, &pos, &stop, 0);
+  CHECK_CHAR_COERCE_INT (fromchar);
+  CHECK_CHAR_COERCE_INT (tochar);
+
+  fromc = XCHAR (fromchar);
+  toc = XCHAR (tochar);
+
+  /* If we don't want undo, turn off putting stuff on the list.
+     That's faster than getting rid of things,
+     and it prevents even the entry for a first change.
+     Also inhibit locking the file.  */
+  if (!NILP (noundo))
+    {
+      record_unwind_protect (subst_char_in_region_unwind,
+			     Fcons (Fcurrent_buffer (), buf->undo_list));
+      buf->undo_list = Qt;
+      /* Don't do file-locking.  */
+      record_unwind_protect (subst_char_in_region_unwind_1,
+			     Fcons (Fcurrent_buffer (), buf->filename));
+      buf->filename = Qnil;
+    }
+
+  mc_count = begin_multiple_change (buf, pos, stop);
+  while (pos < stop)
+    {
+      if (BUF_FETCH_CHAR (buf, pos) == fromc)
+	{
+	  /* There used to be some code here that set the buffer to
+	     unmodified if NOUNDO was specified and there was only
+	     one change to the buffer since it was last saved.
+	     This is a crock of shit, so I'm not duplicating this
+	     behavior.  I think this was left over from when
+	     prepare_to_modify_buffer() actually bumped MODIFF,
+	     so that code was supposed to undo this change. --ben */
+	  buffer_replace_char (buf, pos, toc, !NILP (noundo), 0);
+
+	  /* If noundo is not nil then we don't mark the buffer as
+             modified.  In reality that needs to happen externally
+             only.  Internally redisplay needs to know that the actual
+             contents it should be displaying have changed. */
+	  if (!NILP (noundo))
+	    Fset_buffer_modified_p (Fbuffer_modified_p (Qnil), Qnil);
+	}
+      pos++;
+    }
+  end_multiple_change (buf, mc_count);
+
+  unbind_to (count, Qnil);
+  return Qnil;
+}
+
+/* #### Shouldn't this also accept a BUFFER argument, in the good old
+   XEmacs tradition?  */
+DEFUN ("translate-region", Ftranslate_region, 3, 3, 0, /*
+Translate characters from START to END according to TABLE.
+
+If TABLE is a string, the Nth character in it is the mapping for the
+character with code N.
+
+If TABLE is a vector, its Nth element is the mapping for character
+with code N.  The values of elements may be characters, strings, or
+nil (nil meaning don't replace.)
+
+If TABLE is a char-table, its elements describe the mapping between
+characters and their replacements.  The char-table should be of type
+`char' or `generic'.
+
+Returns the number of substitutions performed.
+*/
+       (start, end, table))
+{
+  /* This function can GC */
+  Bufpos pos, stop;	/* Limits of the region. */
+  int cnt = 0;		/* Number of changes made. */
+  int mc_count;
+  struct buffer *buf = current_buffer;
+  Emchar oc;
+
+  get_buffer_range_char (buf, start, end, &pos, &stop, 0);
+  mc_count = begin_multiple_change (buf, pos, stop);
+  if (STRINGP (table))
+    {
+      struct Lisp_String *stable = XSTRING (table);
+      Charcount size = string_char_length (stable);
+#ifdef MULE
+      /* Under Mule, string_char(n) is O(n), so for large tables or
+         large regions it makes sense to create an array of Emchars.  */
+      if (size * (stop - pos) > 65536)
+	{
+	  Emchar *etable = alloca_array (Emchar, size);
+	  convert_bufbyte_string_into_emchar_string
+	    (string_data (stable), string_length (stable), etable);
+	  for (; pos < stop && (oc = BUF_FETCH_CHAR (buf, pos), 1); pos++)
+	    {
+	      if (oc < size)
+		{
+		  Emchar nc = etable[oc];
+		  if (nc != oc)
+		    {
+		      buffer_replace_char (buf, pos, nc, 0, 0);
+		      ++cnt;
+		    }
+		}
+	    }
+	}
+      else
+#endif /* MULE */
+	{
+	  for (; pos < stop && (oc = BUF_FETCH_CHAR (buf, pos), 1); pos++)
+	    {
+	      if (oc < size)
+		{
+		  Emchar nc = string_char (stable, oc);
+		  if (nc != oc)
+		    {
+		      buffer_replace_char (buf, pos, nc, 0, 0);
+		      ++cnt;
+		    }
+		}
+	    }
+	}
+    }
+  else if (VECTORP (table))
+    {
+      Charcount size = XVECTOR_LENGTH (table);
+      Lisp_Object *vtable = XVECTOR_DATA (table);
+
+      for (; pos < stop && (oc = BUF_FETCH_CHAR (buf, pos), 1); pos++)
+	{
+	  if (oc < size)
+	    {
+	      Lisp_Object replacement = vtable[oc];
+	    retry:
+	      if (CHAR_OR_CHAR_INTP (replacement))
+		{
+		  Emchar nc = XCHAR_OR_CHAR_INT (replacement);
+		  if (nc != oc)
+		    {
+		      buffer_replace_char (buf, pos, nc, 0, 0);
+		      ++cnt;
+		    }
+		}
+	      else if (STRINGP (replacement))
+		{
+		  Charcount incr = XSTRING_CHAR_LENGTH (replacement) - 1;
+		  buffer_delete_range (buf, pos, pos + 1, 0);
+		  buffer_insert_lisp_string_1 (buf, pos, replacement, 0);
+		  pos += incr, stop += incr;
+		  ++cnt;
+		}
+	      else if (!NILP (replacement))
+		{
+		  replacement = wrong_type_argument (Qchar_or_string_p, replacement);
+		  goto retry;
+		}
+	    }
+	}
+    }
+  else if (CHAR_TABLEP (table)
+	   && (XCHAR_TABLE_TYPE (table) == CHAR_TABLE_TYPE_GENERIC
+	       || XCHAR_TABLE_TYPE (table) == CHAR_TABLE_TYPE_CHAR))
+    {
+      struct Lisp_Char_Table *ctable = XCHAR_TABLE (table);
+
+      for (; pos < stop && (oc = BUF_FETCH_CHAR (buf, pos), 1); pos++)
+	{
+	  Lisp_Object replacement = get_char_table (oc, ctable);
+	retry2:
+	  if (CHAR_OR_CHAR_INTP (replacement))
+	    {
+	      Emchar nc = XCHAR_OR_CHAR_INT (replacement);
+	      if (nc != oc)
+		{
+		  buffer_replace_char (buf, pos, nc, 0, 0);
+		  ++cnt;
+		}
+	    }
+	  else if (STRINGP (replacement))
+	    {
+	      Charcount incr = XSTRING_CHAR_LENGTH (replacement) - 1;
+	      buffer_delete_range (buf, pos, pos + 1, 0);
+	      buffer_insert_lisp_string_1 (buf, pos, replacement, 0);
+	      pos += incr, stop += incr;
+	      ++cnt;
+	    }
+	  else if (!NILP (replacement))
+	    {
+	      replacement = wrong_type_argument (Qchar_or_string_p, replacement);
+	      goto retry2;
+	    }
+	}
+    }
+  else
+    dead_wrong_type_argument (Qstringp, table);
+  end_multiple_change (buf, mc_count);
+
+  return make_int (cnt);
+}
+
+DEFUN ("delete-region", Fdelete_region, 2, 3, "r", /*
+Delete the text between point and mark.
+When called from a program, expects two arguments,
+positions (integers or markers) specifying the stretch to be deleted.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (b, e, buffer))
+{
+  /* This function can GC */
+  Bufpos start, end;
+  struct buffer *buf = decode_buffer (buffer, 1);
+
+  get_buffer_range_char (buf, b, e, &start, &end, 0);
+  buffer_delete_range (buf, start, end, 0);
+  zmacs_region_stays = 0;
+  return Qnil;
+}
+
+void
+widen_buffer (struct buffer *b, int no_clip)
+{
+  if (BUF_BEGV (b) != BUF_BEG (b))
+    {
+      clip_changed = 1;
+      SET_BOTH_BUF_BEGV (b, BUF_BEG (b), BI_BUF_BEG (b));
+    }
+  if (BUF_ZV (b) != BUF_Z (b))
+    {
+      clip_changed = 1;
+      SET_BOTH_BUF_ZV (b, BUF_Z (b), BI_BUF_Z (b));
+    }
+  if (clip_changed)
+    {
+      if (!no_clip)
+	MARK_CLIP_CHANGED;
+      /* Changing the buffer bounds invalidates any recorded current
+         column.  */
+      invalidate_current_column ();
+      narrow_line_number_cache (b);
+    }
+}
+
+DEFUN ("widen", Fwiden, 0, 1, "", /*
+Remove restrictions (narrowing) from BUFFER.
+This allows the buffer's full text to be seen and edited.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  widen_buffer (b, 0);
+  zmacs_region_stays = 0;
+  return Qnil;
+}
+
+DEFUN ("narrow-to-region", Fnarrow_to_region, 2, 3, "r", /*
+Restrict editing in BUFFER to the current region.
+The rest of the text becomes temporarily invisible and untouchable
+but is not deleted; if you save the buffer in a file, the invisible
+text is included in the file.  \\[widen] makes all visible again.
+If BUFFER is nil, the current buffer is assumed.
+See also `save-restriction'.
+
+When calling from a program, pass two arguments; positions (integers
+or markers) bounding the text that should remain visible.
+*/
+       (b, e, buffer))
+{
+  Bufpos start, end;
+  struct buffer *buf = decode_buffer (buffer, 1);
+  Bytind bi_start, bi_end;
+
+  get_buffer_range_char (buf, b, e, &start, &end, GB_ALLOW_PAST_ACCESSIBLE);
+  bi_start = bufpos_to_bytind (buf, start);
+  bi_end = bufpos_to_bytind (buf, end);
+
+  SET_BOTH_BUF_BEGV (buf, start, bi_start);
+  SET_BOTH_BUF_ZV (buf, end, bi_end);
+  if (BUF_PT (buf) < start)
+    BUF_SET_PT (buf, start);
+  if (BUF_PT (buf) > end)
+    BUF_SET_PT (buf, end);
+  MARK_CLIP_CHANGED;
+  /* Changing the buffer bounds invalidates any recorded current column.  */
+  invalidate_current_column ();
+  narrow_line_number_cache (buf);
+  zmacs_region_stays = 0;
+  return Qnil;
+}
+
+Lisp_Object
+save_restriction_save (void)
+{
+  Lisp_Object bottom, top;
+  /* Note: I tried using markers here, but it does not win
+     because insertion at the end of the saved region
+     does not advance mh and is considered "outside" the saved region. */
+  bottom = make_int (BUF_BEGV (current_buffer) - BUF_BEG (current_buffer));
+  top = make_int (BUF_Z (current_buffer) - BUF_ZV (current_buffer));
+
+  return noseeum_cons (Fcurrent_buffer (), noseeum_cons (bottom, top));
+}
+
+Lisp_Object
+save_restriction_restore (Lisp_Object data)
+{
+  struct buffer *buf;
+  Charcount newhead, newtail;
+  Lisp_Object tem;
+  int local_clip_changed = 0;
+
+  buf = XBUFFER (XCAR (data));
+  if (!BUFFER_LIVE_P (buf))
+    {
+      /* someone could have killed the buffer in the meantime ... */
+      free_cons (XCONS (XCDR (data)));
+      free_cons (XCONS (data));
+      return Qnil;
+    }
+  tem = XCDR (data);
+  newhead = XINT (XCAR (tem));
+  newtail = XINT (XCDR (tem));
+
+  free_cons (XCONS (XCDR (data)));
+  free_cons (XCONS (data));
+
+  if (newhead + newtail > BUF_Z (buf) - BUF_BEG (buf))
+    {
+      newhead = 0;
+      newtail = 0;
+    }
+
+  {
+    Bufpos start, end;
+    Bytind bi_start, bi_end;
+
+    start = BUF_BEG (buf) + newhead;
+    end = BUF_Z (buf) - newtail;
+
+    bi_start = bufpos_to_bytind (buf, start);
+    bi_end = bufpos_to_bytind (buf, end);
+
+    if (BUF_BEGV (buf) != start)
+      {
+	local_clip_changed = 1;
+	SET_BOTH_BUF_BEGV (buf, start, bi_start);
+	narrow_line_number_cache (buf);
+      }
+    if (BUF_ZV (buf) != end)
+      {
+	local_clip_changed = 1;
+	SET_BOTH_BUF_ZV (buf, end, bi_end);
+      }
+  }
+  if (local_clip_changed)
+    MARK_CLIP_CHANGED;
+
+  /* If point is outside the new visible range, move it inside. */
+  BUF_SET_PT (buf,
+              bufpos_clip_to_bounds (BUF_BEGV (buf),
+				     BUF_PT (buf),
+				     BUF_ZV (buf)));
+
+  return Qnil;
+}
+
+DEFUN ("save-restriction", Fsave_restriction, 0, UNEVALLED, 0, /*
+Execute BODY, saving and restoring current buffer's restrictions.
+The buffer's restrictions make parts of the beginning and end invisible.
+\(They are set up with `narrow-to-region' and eliminated with `widen'.)
+This special form, `save-restriction', saves the current buffer's restrictions
+when it is entered, and restores them when it is exited.
+So any `narrow-to-region' within BODY lasts only until the end of the form.
+The old restrictions settings are restored
+even in case of abnormal exit (throw or error).
+
+The value returned is the value of the last form in BODY.
+
+`save-restriction' can get confused if, within the BODY, you widen
+and then make changes outside the area within the saved restrictions.
+
+Note: if you are using both `save-excursion' and `save-restriction',
+use `save-excursion' outermost:
+    (save-excursion (save-restriction ...))
+*/
+       (body))
+{
+  /* This function can GC */
+  int speccount = specpdl_depth ();
+
+  record_unwind_protect (save_restriction_restore, save_restriction_save ());
+
+  return unbind_to (speccount, Fprogn (body));
+}
+
+
+DEFUN ("format", Fformat, 1, MANY, 0, /*
+Format a string out of a control-string and arguments.
+The first argument is a control string.
+The other arguments are substituted into it to make the result, a string.
+It may contain %-sequences meaning to substitute the next argument.
+%s means print all objects as-is, using `princ'.
+%S means print all objects as s-expressions, using `prin1'.
+%d or %i means print as an integer in decimal (%o octal, %x lowercase hex,
+  %X uppercase hex).
+%c means print as a single character.
+%f means print as a floating-point number in fixed notation (e.g. 785.200).
+%e or %E means print as a floating-point number in scientific notation
+  (e.g. 7.85200e+03).
+%g or %G means print as a floating-point number in "pretty format";
+  depending on the number, either %f or %e/%E format will be used, and
+  trailing zeroes are removed from the fractional part.
+The argument used for all but %s and %S must be a number.  It will be
+  converted to an integer or a floating-point number as necessary.
+
+%$ means reposition to read a specific numbered argument; for example,
+  %3$s would apply the `%s' to the third argument after the control string,
+  and the next format directive would use the fourth argument, the
+  following one the fifth argument, etc. (There must be a positive integer
+  between the % and the $).
+Zero or more of the flag characters `-', `+', ` ', `0', and `#' may be
+  specified between the optional repositioning spec and the conversion
+  character; see below.
+An optional minimum field width may be specified after any flag characters
+  and before the conversion character; it specifies the minimum number of
+  characters that the converted argument will take up.  Padding will be
+  added on the left (or on the right, if the `-' flag is specified), as
+  necessary.  Padding is done with spaces, or with zeroes if the `0' flag
+  is specified.
+If the field width is specified as `*', the field width is assumed to have
+  been specified as an argument.  Any repositioning specification that
+  would normally specify the argument to be converted will now specify
+  where to find this field width argument, not where to find the argument
+  to be converted.  If there is no repositioning specification, the normal
+  next argument is used.  The argument to be converted will be the next
+  argument after the field width argument unless the precision is also
+  specified as `*' (see below).
+
+An optional period character and precision may be specified after any
+  minimum field width.  It specifies the minimum number of digits to
+  appear in %d, %i, %o, %x, and %X conversions (the number is padded
+  on the left with zeroes as necessary); the number of digits printed
+  after the decimal point for %f, %e, and %E conversions; the number
+  of significant digits printed in %g and %G conversions; and the
+  maximum number of non-padding characters printed in %s and %S
+  conversions.  The default precision for floating-point conversions
+  is six.
+If the precision is specified as `*', the precision is assumed to have been
+  specified as an argument.  The argument used will be the next argument
+  after the field width argument, if any.  If the field width was not
+  specified as an argument, any repositioning specification that would
+  normally specify the argument to be converted will now specify where to
+  find the precision argument.  If there is no repositioning specification,
+  the normal next argument is used.
+
+The ` ' and `+' flags mean prefix non-negative numbers with a space or
+  plus sign, respectively.
+The `#' flag means print numbers in an alternate, more verbose format:
+  octal numbers begin with zero; hex numbers begin with a 0x or 0X;
+  a decimal point is printed in %f, %e, and %E conversions even if no
+  numbers are printed after it; and trailing zeroes are not omitted in
+   %g and %G conversions.
+
+Use %% to put a single % into the output.
+*/
+       (int nargs, Lisp_Object *args))
+{
+  /* It should not be necessary to GCPRO ARGS, because
+     the caller in the interpreter should take care of that.  */
+
+  CHECK_STRING (args[0]);
+  return emacs_doprnt_string_lisp (0, args[0], 0, nargs - 1, args + 1);
+}
+
+
+DEFUN ("char-equal", Fchar_equal, 2, 3, 0, /*
+Return t if two characters match, optionally ignoring case.
+Both arguments must be characters (i.e. NOT integers).
+Case is ignored if `case-fold-search' is non-nil in BUFFER.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (c1, c2, buffer))
+{
+  Emchar x1, x2;
+  struct buffer *b = decode_buffer (buffer, 1);
+
+  CHECK_CHAR_COERCE_INT (c1);
+  CHECK_CHAR_COERCE_INT (c2);
+  x1 = XCHAR (c1);
+  x2 = XCHAR (c2);
+
+  return (!NILP (b->case_fold_search)
+	  ? DOWNCASE (b, x1) == DOWNCASE (b, x2)
+	  : x1 == x2)
+    ? Qt : Qnil;
+}
+
+DEFUN ("char=", Fchar_Equal, 2, 3, 0, /*
+Return t if two characters match, case is significant.
+Both arguments must be characters (i.e. NOT integers).
+The optional buffer argument is for symmetry and is ignored.
+*/
+       (c1, c2, buffer))
+{
+  CHECK_CHAR_COERCE_INT (c1);
+  CHECK_CHAR_COERCE_INT (c2);
+
+  return XCHAR(c1) == XCHAR(c2) ? Qt : Qnil;
+}
+
+#if 0 /* Undebugged FSFmacs code */
+/* Transpose the markers in two regions of the current buffer, and
+   adjust the ones between them if necessary (i.e.: if the regions
+   differ in size).
+
+   Traverses the entire marker list of the buffer to do so, adding an
+   appropriate amount to some, subtracting from some, and leaving the
+   rest untouched.  Most of this is copied from adjust_markers in insdel.c.
+
+   It's the caller's job to see that (start1 <= end1 <= start2 <= end2).  */
+
+void
+transpose_markers (Bufpos start1, Bufpos end1, Bufpos start2, Bufpos end2)
+{
+  Charcount amt1, amt2, diff;
+  Lisp_Object marker;
+  struct buffer *buf = current_buffer;
+
+  /* Update point as if it were a marker.  */
+  if (BUF_PT (buf) < start1)
+    ;
+  else if (BUF_PT (buf) < end1)
+    BUF_SET_PT (buf, BUF_PT (buf) + (end2 - end1));
+  else if (BUF_PT (buf) < start2)
+    BUF_SET_PT (buf, BUF_PT (buf) + (end2 - start2) - (end1 - start1));
+  else if (BUF_PT (buf) < end2)
+    BUF_SET_PT (buf, BUF_PT (buf) - (start2 - start1));
+
+  /* We used to adjust the endpoints here to account for the gap, but that
+     isn't good enough.  Even if we assume the caller has tried to move the
+     gap out of our way, it might still be at start1 exactly, for example;
+     and that places it `inside' the interval, for our purposes.  The amount
+     of adjustment is nontrivial if there's a `denormalized' marker whose
+     position is between GPT and GPT + GAP_SIZE, so it's simpler to leave
+     the dirty work to Fmarker_position, below.  */
+
+  /* The difference between the region's lengths */
+  diff = (end2 - start2) - (end1 - start1);
+
+  /* For shifting each marker in a region by the length of the other
+   * region plus the distance between the regions.
+   */
+  amt1 = (end2 - start2) + (start2 - end1);
+  amt2 = (end1 - start1) + (start2 - end1);
+
+  for (marker = BUF_MARKERS (buf); !NILP (marker);
+       marker = XMARKER (marker)->chain)
+    {
+      Bufpos mpos = marker_position (marker);
+      if (mpos >= start1 && mpos < end2)
+	{
+	  if (mpos < end1)
+	    mpos += amt1;
+	  else if (mpos < start2)
+	    mpos += diff;
+	  else
+	    mpos -= amt2;
+	  set_marker_position (marker, mpos);
+	}
+    }
+}
+
+#endif /* 0 */
+
+DEFUN ("transpose-regions", Ftranspose_regions, 4, 5, 0, /*
+Transpose region START1 to END1 with START2 to END2.
+The regions may not be overlapping, because the size of the buffer is
+never changed in a transposition.
+
+Optional fifth arg LEAVE_MARKERS, if non-nil, means don't transpose
+any markers that happen to be located in the regions. (#### BUG: currently
+this function always acts as if LEAVE_MARKERS is non-nil.)
+
+Transposing beyond buffer boundaries is an error.
+*/
+  (startr1, endr1, startr2, endr2, leave_markers))
+{
+  Bufpos start1, end1, start2, end2;
+  Charcount len1, len2;
+  Lisp_Object string1, string2;
+  struct buffer *buf = current_buffer;
+
+  get_buffer_range_char (buf, startr1, endr1, &start1, &end1, 0);
+  get_buffer_range_char (buf, startr2, endr2, &start2, &end2, 0);
+
+  len1 = end1 - start1;
+  len2 = end2 - start2;
+
+  if (start2 < end1)
+    error ("transposed regions not properly ordered");
+  else if (start1 == end1 || start2 == end2)
+    error ("transposed region may not be of length 0");
+
+  string1 = make_string_from_buffer (buf, start1, len1);
+  string2 = make_string_from_buffer (buf, start2, len2);
+  buffer_delete_range (buf, start2, end2, 0);
+  buffer_insert_lisp_string_1 (buf, start2, string1, 0);
+  buffer_delete_range (buf, start1, end1, 0);
+  buffer_insert_lisp_string_1 (buf, start1, string2, 0);
+
+  /* In FSFmacs there is a whole bunch of really ugly code here
+     to attempt to transpose the regions without using up any
+     extra memory.  Although the intent may be good, the result
+     was highly bogus. */
+
+  return Qnil;
+}
+
+
+/************************************************************************/
+/*                            initialization                            */
+/************************************************************************/
+
+void
+syms_of_editfns (void)
+{
+  defsymbol (&Qpoint, "point");
+  defsymbol (&Qmark, "mark");
+  defsymbol (&Qregion_beginning, "region-beginning");
+  defsymbol (&Qregion_end, "region-end");
+  defsymbol (&Qformat, "format");
+  defsymbol (&Quser_files_and_directories, "user-files-and-directories");
+
+  DEFSUBR (Fchar_equal);
+  DEFSUBR (Fchar_Equal);
+  DEFSUBR (Fgoto_char);
+  DEFSUBR (Fstring_to_char);
+  DEFSUBR (Fchar_to_string);
+  DEFSUBR (Fbuffer_substring);
+  DEFSUBR (Fbuffer_substring_no_properties);
+
+  DEFSUBR (Fpoint_marker);
+  DEFSUBR (Fmark_marker);
+  DEFSUBR (Fpoint);
+  DEFSUBR (Fregion_beginning);
+  DEFSUBR (Fregion_end);
+  DEFSUBR (Fsave_excursion);
+  DEFSUBR (Fsave_current_buffer);
+
+  DEFSUBR (Fbuffer_size);
+  DEFSUBR (Fpoint_max);
+  DEFSUBR (Fpoint_min);
+  DEFSUBR (Fpoint_min_marker);
+  DEFSUBR (Fpoint_max_marker);
+
+  DEFSUBR (Fbobp);
+  DEFSUBR (Feobp);
+  DEFSUBR (Fbolp);
+  DEFSUBR (Feolp);
+  DEFSUBR (Ffollowing_char);
+  DEFSUBR (Fpreceding_char);
+  DEFSUBR (Fchar_after);
+  DEFSUBR (Fchar_before);
+  DEFSUBR (Finsert);
+  DEFSUBR (Finsert_string);
+  DEFSUBR (Finsert_before_markers);
+  DEFSUBR (Finsert_char);
+
+  DEFSUBR (Ftemp_directory);
+  DEFSUBR (Fuser_login_name);
+  DEFSUBR (Fuser_real_login_name);
+  DEFSUBR (Fuser_uid);
+  DEFSUBR (Fuser_real_uid);
+  DEFSUBR (Fuser_full_name);
+  DEFSUBR (Fuser_home_directory);
+  DEFSUBR (Femacs_pid);
+  DEFSUBR (Fcurrent_time);
+  DEFSUBR (Fcurrent_process_time);
+  DEFSUBR (Fformat_time_string);
+  DEFSUBR (Fdecode_time);
+  DEFSUBR (Fencode_time);
+  DEFSUBR (Fcurrent_time_string);
+  DEFSUBR (Fcurrent_time_zone);
+  DEFSUBR (Fset_time_zone_rule);
+  DEFSUBR (Fsystem_name);
+  DEFSUBR (Fformat);
+
+  DEFSUBR (Finsert_buffer_substring);
+  DEFSUBR (Fcompare_buffer_substrings);
+  DEFSUBR (Fsubst_char_in_region);
+  DEFSUBR (Ftranslate_region);
+  DEFSUBR (Fdelete_region);
+  DEFSUBR (Fwiden);
+  DEFSUBR (Fnarrow_to_region);
+  DEFSUBR (Fsave_restriction);
+  DEFSUBR (Ftranspose_regions);
+
+  defsymbol (&Qzmacs_update_region, "zmacs-update-region");
+  defsymbol (&Qzmacs_deactivate_region, "zmacs-deactivate-region");
+  defsymbol (&Qzmacs_region_buffer, "zmacs-region-buffer");
+}
+
+void
+vars_of_editfns (void)
+{
+  staticpro (&Vsystem_name);
+#if 0
+  staticpro (&Vuser_name);
+  staticpro (&Vuser_real_name);
+#endif
+  DEFVAR_BOOL ("zmacs-regions", &zmacs_regions /*
+*Whether LISPM-style active regions should be used.
+This means that commands which operate on the region (the area between the
+point and the mark) will only work while the region is in the ``active''
+state, which is indicated by highlighting.  Executing most commands causes
+the region to not be in the active state, so (for example) \\[kill-region] will only
+work immediately after activating the region.
+
+More specifically:
+
+ - Commands which operate on the region only work if the region is active.
+ - Only a very small set of commands cause the region to become active:
+   Those commands whose semantics are to mark an area, like mark-defun.
+ - The region is deactivated after each command that is executed, except that:
+ - "Motion" commands do not change whether the region is active or not.
+
+set-mark-command (C-SPC) pushes a mark and activates the region.  Moving the
+cursor with normal motion commands (C-n, C-p, etc) will cause the region
+between point and the recently-pushed mark to be highlighted.  It will
+remain highlighted until some non-motion command is executed.
+
+exchange-point-and-mark (\\[exchange-point-and-mark]) activates the region.  So if you mark a
+region and execute a command that operates on it, you can reactivate the
+same region with \\[exchange-point-and-mark] (or perhaps \\[exchange-point-and-mark] \\[exchange-point-and-mark]) to operate on it
+again.
+
+Generally, commands which push marks as a means of navigation (like
+beginning-of-buffer and end-of-buffer (M-< and M->)) do not activate the
+region.  But commands which push marks as a means of marking an area of
+text (like mark-defun (\\[mark-defun]), mark-word (\\[mark-word]) or mark-whole-buffer (\\[mark-whole-buffer]))
+do activate the region.
+
+The way the command loop actually works with regard to deactivating the
+region is as follows:
+
+- If the variable `zmacs-region-stays' has been set to t during the command
+  just executed, the region is left alone (this is how the motion commands
+  make the region stay around; see the `_' flag in the `interactive'
+  specification).  `zmacs-region-stays' is reset to nil before each command
+  is executed.
+- If the function `zmacs-activate-region' has been called during the command
+  just executed, the region is left alone.  Very few functions should
+  actually call this function.
+- Otherwise, if the region is active, the region is deactivated and
+  the `zmacs-deactivate-region-hook' is called.
+*/ );
+  /* Zmacs style active regions are now ON by default */
+  zmacs_regions = 1;
+
+  DEFVAR_BOOL ("zmacs-region-active-p", &zmacs_region_active_p /*
+Do not alter this.  It is for internal use only.
+*/ );
+  zmacs_region_active_p = 0;
+
+  DEFVAR_BOOL ("zmacs-region-stays", &zmacs_region_stays /*
+Whether the current command will deactivate the region.
+Commands which do not wish to affect whether the region is currently
+highlighted should set this to t.  Normally, the region is turned off after
+executing each command that did not explicitly turn it on with the function
+zmacs-activate-region. Setting this to true lets a command be non-intrusive.
+See the variable `zmacs-regions'.
+
+The same effect can be achieved using the `_' interactive specification.
+*/ );
+  zmacs_region_stays = 0;
+
+  DEFVAR_BOOL ("atomic-extent-goto-char-p", &atomic_extent_goto_char_p /*
+Do not use this -- it will be going away soon.
+Indicates if `goto-char' has just been run.  This information is allegedly
+needed to get the desired behavior for atomic extents and unfortunately
+is not available by any other means.
+*/ );
+  atomic_extent_goto_char_p = 0;
+#ifdef AMPERSAND_FULL_NAME
+  Fprovide(intern("ampersand-full-name"));
+#endif
+
+  DEFVAR_LISP ("user-full-name", &Vuser_full_name /*
+*The name of the user.
+The function `user-full-name', which will return the value of this
+ variable, when called without arguments.
+This is initialized to the value of the NAME environment variable.
+*/ );
+  /* Initialized at run-time. */
+  Vuser_full_name = Qnil;
+}