62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This 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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This 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 this 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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#ifndef _MALLOC_INTERNAL
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#define _MALLOC_INTERNAL
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#include <malloc.h>
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#endif
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__ptr_t
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memalign (alignment, size)
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size_t alignment;
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size_t size;
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{
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__ptr_t result;
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unsigned long int adj;
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size = ((size + alignment - 1) / alignment) * alignment;
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result = malloc (size);
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if (result == NULL)
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return NULL;
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adj = (unsigned long int) ((unsigned long int) ((char *) result -
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(char *) NULL)) % alignment;
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if (adj != 0)
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{
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struct alignlist *l;
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for (l = _aligned_blocks; l != NULL; l = l->next)
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if (l->aligned == NULL)
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/* This slot is free. Use it. */
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break;
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if (l == NULL)
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{
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l = (struct alignlist *) malloc (sizeof (struct alignlist));
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if (l == NULL)
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{
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free (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 = _aligned_blocks;
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_aligned_blocks = l;
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}
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return result;
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}
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