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65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include "mmalloc.h"
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PTR
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mmemalign (md, alignment, size)
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PTR md;
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size_t alignment;
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size_t size;
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{
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PTR result;
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unsigned long int adj;
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struct alignlist *l;
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struct mdesc *mdp;
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size = ((size + alignment - 1) / alignment) * alignment;
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if ((result = mmalloc (md, size)) != NULL)
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{
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adj = RESIDUAL (result, alignment);
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if (adj != 0)
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{
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mdp = MD_TO_MDP (md);
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for (l = mdp -> aligned_blocks; l != NULL; l = l -> next)
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{
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if (l -> aligned == NULL)
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{
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/* This slot is free. Use it. */
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break;
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}
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}
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if (l == NULL)
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{
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l = (struct alignlist *) mmalloc (md, sizeof (struct alignlist));
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if (l == NULL)
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{
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mfree (md, result);
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return (NULL);
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}
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}
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l -> exact = result;
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result = l -> aligned = (char *) result + alignment - adj;
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l -> next = mdp -> aligned_blocks;
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mdp -> aligned_blocks = l;
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}
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}
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return (result);
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}
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