add posix_madvise, posix_memalign, strndup, and strnlen. mostly from

brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

1 files changed, 26 insertions, 1 deletions

diff --git a/src/lib/libc/stdlib/malloc.c b/src/lib/libc/stdlib/malloc.c
index 9cee3e5935..902b69c216 100644
--- a/src/lib/libc/stdlib/malloc.c
+++ b/src/lib/libc/stdlib/malloc.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: malloc.c,v 1.124 2010/01/13 12:40:11 otto Exp $       */
+/*      $OpenBSD: malloc.c,v 1.125 2010/05/18 22:24:55 tedu Exp $       */
 /*
  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
  *
@@ -1488,3 +1488,28 @@ calloc(size_t nmemb, size_t size)
         return r;
 }
 
+int
+posix_memalign(void **memptr, size_t alignment, size_t size)
+{
+        void *result;
+
+        /* Make sure that alignment is a large enough power of 2. */
+        if (((alignment - 1) & alignment) != 0 || alignment < sizeof(void *) ||
+            alignment > MALLOC_PAGESIZE)
+                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 == NULL)
+                return ENOMEM;
+
+        *memptr = result;
+        return 0;
+}
+