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/*
Copyright (C) 1996-2013 John W. Eaton
This file is part of Octave.
Octave 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 3 of the License, or (at your
option) any later version.
Octave 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 Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <new>
#include "oct-alloc.h"
void *
octave_allocator::alloc (size_t size)
{
if (size != item_size)
return ::new char [size];
if (! head)
{
if (! grow ())
return 0;
}
link *tmp = head;
head = head->next;
return tmp;
}
// FIXME: if we free the last item on the list, shouldn't we
// also free the underlying character array used for storage?
void
octave_allocator::free (void *p, size_t size)
{
if (size != item_size)
::delete [] (static_cast<char *> (p));
else
{
link *tmp = static_cast<link *> (p);
tmp->next = head;
head = tmp;
}
}
// Return TRUE for successful allocation, FALSE otherwise.
bool
octave_allocator::grow (void)
{
bool retval = true;
char *start = new char [grow_size * item_size];
if (start)
{
char *last = &start[(grow_size - 1) * item_size];
char *p = start;
while (p < last)
{
char *next = p + item_size;
(reinterpret_cast<link *> (p)) -> next
= reinterpret_cast<link *> (next);
p = next;
}
(reinterpret_cast<link *> (last)) -> next = 0;
head = reinterpret_cast<link *> (start);
}
else
{
typedef void (*error_handler_function) (void);
error_handler_function f = std::set_new_handler (0);
std::set_new_handler (f);
if (f)
f ();
retval = false;
}
return retval;
}
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