62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* 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);
|
|
}
|