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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.

This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public License as

published by the Free Software Foundation; either version 2 of the

License, or (at your option) any later version.

The GNU C Library 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with the GNU C Library; see the file COPYING.LIB.  If

not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

Boston, MA 02111-1307, USA.  */

#include "mmprivate.h"

PTR

mmemalign (md, alignment, size)

  PTR md;

  size_t alignment;

  size_t size;

{

  PTR result;

  unsigned long int adj;

  struct alignlist *l;

  struct mdesc *mdp;

  if ((result = mmalloc (md, size + alignment - 1)) != NULL)

    {

      adj = RESIDUAL (result, alignment);

      if (adj != 0)

        {

          mdp = MD_TO_MDP (md);

          for (l = mdp -> aligned_blocks; l != NULL; l = l -> next)

            {

              if (l -> aligned == NULL)

                {

                  /* This slot is free.  Use it.  */

                  break;

                }

            }

          if (l == NULL)

            {

              l = (struct alignlist *) mmalloc (md, sizeof (struct alignlist));

              if (l == NULL)

                {

                  mfree (md, result);

                  return (NULL);

                }

              l -> next = mdp -> aligned_blocks;

              mdp -> aligned_blocks = l;

            }

          l -> exact = result;

          result = l -> aligned = (char *) result + alignment - adj;

        }

    }

  return (result);

}