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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 */
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