scripts

commit dfeb089a5def8b30d5c8b8a485d7c473032d7c2c
parent 388ef950bf8ef5239c30e27c344ebb64592927f4
Author: sin <sin@2f30.org>
Date:   Tue, 30 Jul 2013 10:51:46 +0100

Grab OpenBSD's memalign

Diffstat:
M
alloc.c
 | 
23
++++++++++++++++++++---

1 file changed, 20 insertions(+), 3 deletions(-)
diff --git a/alloc.c b/alloc.c
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 
 enum chunk_state {
 	FREE = 0,
@@ -149,8 +150,24 @@ malloc_size(void *p)
 }
 
 int
-posix_memalign(void **ptr, size_t alignment, size_t size)
+posix_memalign(void **memptr, size_t alignment, size_t size)
 {
-	fprintf(stderr, "%s: not implemented\n", __func__);
-	abort();
+	void *result;
+
+	/* Make sure that alignment is a large enough power of 2. */
+	if (((alignment - 1) & alignment) != 0 || alignment < sizeof(void *))
+		return EINVAL;
+
+	/*
+	 * max(size, alignment) is enough to assure the requested alignment,
+	 * since the allocator always allocates power-of-two blocks.
+	 */
+	if (size < alignment)
+		size = alignment;
+	result = malloc(size);
+	if (!result)
+		return ENOMEM;
+
+	*memptr = result;
+	return 0;
 }