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diff --git a/src/vmsmap.c b/src/vmsmap.c
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+/* VMS mapping of data and alloc arena for GNU Emacs.
+   Copyright (C) 1986, 1987 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)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Written by Mukesh Prasad.  */
+
+#ifdef VMS
+
+#include "config.h"
+#include "lisp.h"
+#include <rab.h>
+#include <fab.h>
+#include <rmsdef.h>
+#include <secdef.h>
+
+/* RMS block size */
+#define BLOCKSIZE       512
+
+/* Maximum number of bytes to be written in one RMS write.
+ * Must be a multiple of BLOCKSIZE.
+ */
+#define MAXWRITE        (BLOCKSIZE * 30)
+
+/* This funniness is to ensure that sdata occurs alphabetically BEFORE the
+   $DATA psect and that edata occurs after ALL Emacs psects.  This is
+   because the VMS linker sorts all psects in a cluster alphabetically
+   during the linking, unless you use the cluster_psect command.  Emacs
+   uses the cluster command to group all Emacs psects into one cluster;
+   this keeps the dumped data separate from any loaded libraries. */
+
+globaldef {"$D$ATA"} char sdata[512]; /* Start of saved data area */
+globaldef {"__DATA"} char edata[512]; /* End of saved data area */
+
+/* Structure to write into first block of map file.
+ */
+
+struct map_data
+{
+  char * sdata;                 /* Start of data area */
+  char * edata;                 /* End of data area */
+  int  datablk;                 /* Block in file to map data area from/to */
+};
+
+static void fill_fab (), fill_rab ();
+static int write_data ();
+
+extern char *start_of_data ();
+extern int vms_out_initial;     /* Defined in malloc.c */
+
+/* Maps in the data and alloc area from the map file.
+ */
+
+int
+mapin_data (name)
+     char * name;
+{
+  struct FAB fab;
+  struct RAB rab;
+  int status, size;
+  int inadr[2];
+  struct map_data map_data;
+  
+  /* Open map file. */
+  fab = cc$rms_fab;
+  fab.fab$b_fac = FAB$M_BIO|FAB$M_GET;
+  fab.fab$l_fna = name;
+  fab.fab$b_fns = strlen (name);
+  status = sys$open (&fab);
+  if (status != RMS$_NORMAL)
+    {
+      printf ("Map file not available, running bare Emacs....\n");
+      return 0;                 /* Map file not available */
+    }
+  /* Connect the RAB block */
+  rab = cc$rms_rab;
+  rab.rab$l_fab = &fab;
+  rab.rab$b_rac = RAB$C_SEQ;
+  rab.rab$l_rop = RAB$M_BIO;
+  status = sys$connect (&rab);
+  if (status != RMS$_NORMAL)
+    lib$stop (status);
+  /* Read the header data */
+  rab.rab$l_ubf = &map_data;
+  rab.rab$w_usz = sizeof (map_data);
+  rab.rab$l_bkt = 0;
+  status = sys$read (&rab);
+  if (status != RMS$_NORMAL)
+    lib$stop (status);
+  status = sys$close (&fab);
+  if (status != RMS$_NORMAL)
+    lib$stop (status);
+  if (map_data.sdata != start_of_data ())
+    {
+      printf ("Start of data area has moved: cannot map in data.\n");
+      return 0;
+    }
+  if (map_data.edata != edata)
+    {
+      printf ("End of data area has moved: cannot map in data.\n");
+      return 0;
+    }
+  fab.fab$l_fop |= FAB$M_UFO;
+  status = sys$open (&fab);
+  if (status != RMS$_NORMAL)
+    lib$stop (status);
+  /* Map data area. */
+  inadr[0] = map_data.sdata;
+  inadr[1] = map_data.edata;
+  status = sys$crmpsc (inadr, 0, 0, SEC$M_CRF | SEC$M_WRT, 0, 0, 0,
+                       fab.fab$l_stv, 0, map_data.datablk, 0, 0);
+  if (! (status & 1))
+    lib$stop (status);
+}
+
+/* Writes the data and alloc area to the map file.
+ */
+mapout_data (into)
+     char * into;
+{
+  struct FAB fab;
+  struct RAB rab;
+  int status;
+  struct map_data map_data;
+  int datasize, msize;
+ 
+  if (vms_out_initial)
+    {
+      error ("Out of initial allocation. Must rebuild emacs with more memory (VMS_ALLOCATION_SIZE).");
+      return 0;
+    }
+  map_data.sdata = start_of_data ();
+  map_data.edata = edata;
+  datasize = map_data.edata - map_data.sdata + 1;
+  map_data.datablk = 2 + (sizeof (map_data) + BLOCKSIZE - 1) / BLOCKSIZE;
+  /* Create map file. */
+  fab = cc$rms_fab;
+  fab.fab$b_fac = FAB$M_BIO|FAB$M_PUT;
+  fab.fab$l_fna = into;
+  fab.fab$b_fns = strlen (into);
+  fab.fab$l_fop = FAB$M_CBT;
+  fab.fab$b_org = FAB$C_SEQ;
+  fab.fab$b_rat = 0;
+  fab.fab$b_rfm = FAB$C_VAR;
+  fab.fab$l_alq = 1 + map_data.datablk +
+                      ((datasize + BLOCKSIZE - 1) / BLOCKSIZE);
+  status = sys$create (&fab);
+  if (status != RMS$_NORMAL)
+    {
+      error ("Could not create map file");
+      return 0;
+    }
+  /* Connect the RAB block */
+  rab = cc$rms_rab;
+  rab.rab$l_fab = &fab;
+  rab.rab$b_rac = RAB$C_SEQ;
+  rab.rab$l_rop = RAB$M_BIO;
+  status = sys$connect (&rab);
+  if (status != RMS$_NORMAL)
+    {
+      error ("RMS connect to map file failed");
+      return 0;
+    }
+  /* Write the header */
+  rab.rab$l_rbf = &map_data;
+  rab.rab$w_rsz = sizeof (map_data);
+  status = sys$write (&rab);
+  if (status != RMS$_NORMAL)
+    {
+      error ("RMS write (header) to map file failed");
+      return 0;
+    }
+  if (! write_data (&rab, map_data.datablk, map_data.sdata, datasize))
+    return 0;
+  status = sys$close (&fab);
+  if (status != RMS$_NORMAL)
+    {
+      error ("RMS close on map file failed");
+      return 0;
+    }
+  return 1;
+}
+
+static int
+write_data (rab, firstblock, data, length)
+     struct RAB * rab;
+     char * data;
+{
+  int status;
+  
+  rab->rab$l_bkt = firstblock;
+  while (length > 0)
+    {
+      rab->rab$l_rbf = data;
+      rab->rab$w_rsz = length > MAXWRITE ? MAXWRITE : length;
+      status = sys$write (rab, 0, 0);
+      if (status != RMS$_NORMAL)
+        {
+          error ("RMS write to map file failed");
+          return 0;
+        }
+      data = &data[MAXWRITE];
+      length -= MAXWRITE;
+      rab->rab$l_bkt = 0;
+    }
+  return 1;
+}                               /* write_data */
+
+#endif /* VMS */
+