| /* 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); |
| } |