1 files changed, 82 insertions, 0 deletions
diff --git a/TAO/tao/Align.h b/TAO/tao/Align.h
new file mode 100644
index 00000000000..14a670b7f7d
--- /dev/null
+++ b/TAO/tao/Align.h
@@ -0,0 +1,82 @@
+// This may look like C, but it's really -*- C++ -*-
+// @(#) $Id$
+
+// ============================================================================
+//
+// = LIBRARY
+//    TAO
+//
+// = FILENAME
+//    align.h
+//
+// = DESCRIPTION
+//    Pointer alignment utilities
+//
+//    A "ptr_arith_t" type is defined for doing numerical operations
+//    on pointers, such as aligning them.  Pointer sizes vary from 2
+//    to 8 bytes in today's environments; a portable data type is much
+//    needed.
+//
+// = AUTHOR
+//     Copyright 1994-1995 by Sun Microsystems, Inc.
+//
+// ============================================================================
+
+#if !defined (TAO_ALIGN_H)
+#define TAO_ALIGN_H
+
+// Type for doing arithmetic on pointers ... as elsewhere, we assume
+// that "unsigned" versions of a type are the same size as the
+// "signed" version of the same type.
+
+#if     ACE_SIZEOF_VOID_P == ACE_SIZEOF_INT
+typedef u_int ptr_arith_t;
+
+#elif   ACE_SIZEOF_VOID_P == ACE_SIZEOF_LONG
+typedef u_long ptr_arith_t;
+
+#elif   ACE_SIZEOF_VOID_P == ACE_SIZEOF_LONG_LONG
+typedef u_long long ptr_arith_t;
+
+#else
+#       error "Can't find a suitable type for doing pointer arithmetic."
+#endif /* error */
+
+// Efficiently align "value" up to "alignment", knowing that all such
+// boundaries are binary powers and that we're using two's complement
+// arithmetic.
+
+#if 0
+static inline ptr_arith_t
+align_binary (const ptr_arith_t value,
+              size_t alignment)
+{
+  ptr_arith_t temp = alignment - 1;
+
+  return (value + temp) & ~temp;
+}
+#endif /* 0 */
+#define align_binary(ptr, alignment) \
+    ((ptr + ((ptr_arith_t)((alignment)-1))) & (~((ptr_arith_t)((alignment)-1))))
+
+// Efficiently round "ptr" up to an "alignment" boundary, knowing that
+// all such boundaries are binary powers and that we're using two's
+// complement arithmetic.
+//
+// XXX Returned as "byte pointer" -- CDR module would change to be
+// seen as a "void *".  May want to change this to add XDR cleanly.
+
+// @@ Andy, do we still need this function or is the macro sufficient?
+// If the macro is sufficient can we remove the function?
+#if 0
+static inline u_char *
+ptr_align_binary (const u_char *ptr,
+                  size_t alignment)
+{
+  return (u_char *) align_binary ((ptr_arith_t) ptr, alignment);
+}
+#endif /* 0 */
+#define ptr_align_binary(ptr, alignment) \
+        ((u_char *) align_binary (((ptr_arith_t) (ptr)), (alignment)))
+
+#endif /* TAO_ALIGN_H */