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// 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 SIZEOF_VOID_P == SIZEOF_INT
typedef u_int ptr_arith_t;
#elif SIZEOF_VOID_P == SIZEOF_LONG
typedef u_long ptr_arith_t;
#elif SIZEOF_VOID_P == 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.
#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 */
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