/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @brief Greedy Allocate that Empties the sbrk system call
 *
 * @ingroup MallocSupport
 *
 * @brief Greedy allocation os sbrk system call memory
 *
 * The call consumes all the avialable sbrk memory extending
 * the supplied heap with it. There is no free as sbrk memory
 * is only ever allocated.
 */

/*
 * Copyright (c) 2021 Chris Johns.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "malloc_p.h"

void rtems_heap_sbrk_greedy_allocate(
  Heap_Control *heap,
  size_t alloc_size
)
{
  while ( alloc_size > 0 ) {
    void *p = (*rtems_malloc_extend_handler)( heap, alloc_size );
    if ( p == NULL ) {
      alloc_size >>= 1;
    } else {
      if ( rtems_malloc_dirty_helper != NULL ) {
	(*rtems_malloc_dirty_helper)( p, alloc_size );
      }
    }
  }
}