split-out memalign and realloc

 -Erik

1 files changed, 67 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..eea460aad
--- /dev/null
+++ b/libc/stdlib/malloc-930716/memalign.c
@@ -0,0 +1,67 @@
+/* malloc.c - C standard library routine.
+   Copyright (c) 1989, 1993  Michael J. Haertel
+   You may redistribute this library under the terms of the
+   GNU Library General Public License (version 2 or any later
+   version) as published by the Free Software Foundation.
+   THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED
+   WARRANTY.  IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR
+   WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS
+   SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */
+
+#define _GNU_SOURCE
+#include <features.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "malloc.h"
+
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+extern pthread_mutex_t __malloclock;
+# define LOCK	pthread_mutex_lock(&__malloclock)
+# define UNLOCK	pthread_mutex_unlock(&__malloclock);
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+
+__ptr_t memalign (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;
+	LOCK;
+	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) {
+		__free_unlocked (result);
+		UNLOCK;
+		return NULL;
+	    }
+	    l->next = _aligned_blocks;
+	    _aligned_blocks = l;
+	}
+	l->exact = result;
+	result = l->aligned = (char *) result + alignment - adj;
+	UNLOCK;
+    }
+
+    return result;
+}
+