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/* Functions for memory limit warnings.
Copyright (C) 1990, 1992 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, 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. */

#ifdef emacs
#include <config.h>
#include "lisp.h"
#endif

#ifndef emacs
#include <stddef.h>
typedef size_t SIZE;
typedef void *POINTER;
#define EXCEEDS_LISP_PTR(x) 0
#endif

#include "mem-limits.h"

/*
Level number of warnings already issued.
0 -- no warnings issued.
1 -- 75% warning already issued.
2 -- 85% warning already issued.
3 -- 95% warning issued; keep warning frequently.
*/
static int warnlevel;

/* Function to call to issue a warning;
0 means don't issue them. */
static void (*warn_function) ();

/* Get more memory space, complaining if we're near the end. */

static void
check_memory_limits ()
{
  extern POINTER (*__morecore) ();

  register POINTER cp;
  unsigned long five_percent;
  unsigned long data_size;

  if (lim_data == 0)
    get_lim_data ();
  five_percent = lim_data / 20;

  /* Find current end of memory and issue warning if getting near max */
  cp = (char *) (*__morecore) (0);
  data_size = (char *) cp - (char *) data_space_start;

  if (warn_function)
    switch (warnlevel)
      {
      case 0:
if (data_size > five_percent * 15)
{
warnlevel++;
(*warn_function) ("Warning: past 75% of memory limit");
}
break;

      case 1:
if (data_size > five_percent * 17)
{
warnlevel++;
(*warn_function) ("Warning: past 85% of memory limit");
}
break;

      case 2:
if (data_size > five_percent * 19)
{
warnlevel++;
(*warn_function) ("Warning: past 95% of memory limit");
}
break;

      default:
(*warn_function) ("Warning: past acceptable memory limits");
break;
      }

  /* If we go down below 70% full, issue another 75% warning
when we go up again. */
  if (data_size < five_percent * 14)
    warnlevel = 0;
  /* If we go down below 80% full, issue another 85% warning
when we go up again. */
  else if (warnlevel > 1 && data_size < five_percent * 16)
    warnlevel = 1;
  /* If we go down below 90% full, issue another 95% warning
when we go up again. */
  else if (warnlevel > 2 && data_size < five_percent * 18)
    warnlevel = 2;

  if (EXCEEDS_LISP_PTR (cp))
    (*warn_function) ("Warning: memory in use exceeds lisp pointer size");
}

/* Cause reinitialization based on job parameters;
also declare where the end of pure storage is. */

void
memory_warnings (start, warnfun)
     POINTER start;
     void (*warnfun) ();
{
  extern void (* __after_morecore_hook) (); /* From gmalloc.c */

  if (start)
    data_space_start = start;
  else
    data_space_start = start_of_data ();

  warn_function = warnfun;
  __after_morecore_hook = check_memory_limits;
}
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