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authorEric Andersen <andersen@codepoet.org>2001-01-11 11:42:17 +0000
committerEric Andersen <andersen@codepoet.org>2001-01-11 11:42:17 +0000
commitae97a89e1a1a9833080dccc81f6cd26784e1b964 (patch)
tree6ff1ddc7e3980591c7fd0bbd5d9b8ac82da12886 /libc/stdlib/malloc-930716/memalign.c
parentabdc3e4d06db2b9d93c509774fc7c4fde918ec8e (diff)
A large update from Manuel Novoa III <mnovoa3@bellsouth.net>.
Diffstat (limited to 'libc/stdlib/malloc-930716/memalign.c')
-rw-r--r--libc/stdlib/malloc-930716/memalign.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/libc/stdlib/malloc-930716/memalign.c b/libc/stdlib/malloc-930716/memalign.c
new file mode 100644
index 000000000..1098f5890
--- /dev/null
+++ b/libc/stdlib/malloc-930716/memalign.c
@@ -0,0 +1,61 @@
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <stdlib.h>
+#include "malloc.h"
+
+__ptr_t
+memalign (alignment, size)
+ size_t alignment;
+ size_t size;
+{
+ __ptr_t result;
+ unsigned long int adj;
+
+ result = malloc (size + alignment - 1);
+ if (result == NULL)
+ return NULL;
+ adj = (unsigned long int) ((unsigned long int) ((char *) result -
+ (char *) NULL)) % alignment;
+ if (adj != 0)
+ {
+ struct alignlist *l;
+ for (l = _aligned_blocks; l != NULL; l = l->next)
+ if (l->aligned == NULL)
+ /* This slot is free. Use it. */
+ break;
+ if (l == NULL)
+ {
+ l = (struct alignlist *) malloc (sizeof (struct alignlist));
+ if (l == NULL)
+ {
+#if 1
+ free (result);
+#else
+ _free_internal (result);
+#endif
+ return NULL;
+ }
+ l->next = _aligned_blocks;
+ _aligned_blocks = l;
+ }
+ l->exact = result;
+ result = l->aligned = (char *) result + alignment - adj;
+ }
+
+ return result;
+}