R6.6 is the Xorg base-line

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+/***********************************************************
+
+Copyright 1987, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+#ifndef XMD_H
+#define XMD_H 1
+/* $Xorg: Xmd.h,v 1.4 2001/02/09 02:03:22 xorgcvs Exp $ */
+/*
+ *  Xmd.h: MACHINE DEPENDENT DECLARATIONS.
+ */
+
+/*
+ * Special per-machine configuration flags.
+ */
+#ifdef CRAY
+#define WORD64				/* 64-bit architecture */
+#endif
+#ifdef __alpha
+#define LONG64				/* 32/64-bit architecture */
+#endif
+#ifdef __sgi
+#if (_MIPS_SZLONG == 64)
+#define LONG64
+#endif
+#endif
+
+/*
+ * Stuff to handle large architecture machines; the constants were generated
+ * on a 32-bit machine and must coorespond to the protocol.
+ */
+#ifdef WORD64
+#define MUSTCOPY
+#endif /* WORD64 */
+
+
+/*
+ * Definition of macro used to set constants for size of network structures;
+ * machines with preprocessors that can't handle all of the sz_ symbols
+ * can define this macro to be sizeof(x) if and only if their compiler doesn't
+ * pad out structures (esp. the xTextElt structure which contains only two 
+ * one-byte fields).  Network structures should always define sz_symbols.
+ *
+ * The sz_ prefix is used instead of something more descriptive so that the
+ * symbols are no more than 32 characters long (which causes problems for some
+ * compilers and preprocessors).
+ *
+ * The extra indirection in the __STDC__ case is to get macro arguments to
+ * expand correctly before the concatenation, rather than afterward.
+ */
+#if ((defined(__STDC__) || defined(__cplusplus) || defined(c_plusplus)) && !defined(UNIXCPP)) || defined(ANSICPP)
+#define _SIZEOF(x) sz_##x
+#define SIZEOF(x) _SIZEOF(x)
+#else
+#define SIZEOF(x) sz_/**/x
+#endif /* if ANSI C compiler else not */
+
+/*
+ * Bitfield suffixes for the protocol structure elements, if you
+ * need them.  Note that bitfields are not guarranteed to be signed
+ * (or even unsigned) according to ANSI C.
+ */
+#ifdef WORD64
+typedef long INT64;
+typedef unsigned long CARD64;
+#define B32 :32
+#define B16 :16
+#ifdef UNSIGNEDBITFIELDS
+typedef unsigned int INT32;
+typedef unsigned int INT16;
+#else
+#ifdef __STDC__
+typedef signed int INT32;
+typedef signed int INT16;
+#else
+typedef int INT32;
+typedef int INT16;
+#endif
+#endif
+#else
+#define B32
+#define B16
+#ifdef LONG64
+typedef long INT64;
+typedef int INT32;
+#else
+typedef long INT32;
+#endif
+typedef short INT16;
+#endif
+
+#if defined(__STDC__) || defined(sgi) || defined(AIXV3)
+typedef signed char    INT8;
+#else
+typedef char           INT8;
+#endif
+
+#ifdef LONG64
+typedef unsigned long CARD64;
+typedef unsigned int CARD32;
+#else
+typedef unsigned long CARD32;
+#endif
+typedef unsigned short CARD16;
+typedef unsigned char  CARD8;
+
+typedef CARD32		BITS32;
+typedef CARD16		BITS16;
+typedef CARD8		BYTE;
+
+typedef CARD8           BOOL;
+
+
+/*
+ * definitions for sign-extending bitfields on 64-bit architectures
+ */
+#if defined(WORD64) && defined(UNSIGNEDBITFIELDS)
+#define cvtINT8toInt(val)   (((val) & 0x00000080) ? ((val) | 0xffffffffffffff00) : (val))
+#define cvtINT16toInt(val)  (((val) & 0x00008000) ? ((val) | 0xffffffffffff0000) : (val))
+#define cvtINT32toInt(val)  (((val) & 0x80000000) ? ((val) | 0xffffffff00000000) : (val))
+#define cvtINT8toShort(val)  cvtINT8toInt(val)
+#define cvtINT16toShort(val) cvtINT16toInt(val)
+#define cvtINT32toShort(val) cvtINT32toInt(val)
+#define cvtINT8toLong(val)  cvtINT8toInt(val)
+#define cvtINT16toLong(val) cvtINT16toInt(val)
+#define cvtINT32toLong(val) cvtINT32toInt(val)
+#else
+#define cvtINT8toInt(val) (val)
+#define cvtINT16toInt(val) (val)
+#define cvtINT32toInt(val) (val)
+#define cvtINT8toShort(val) (val)
+#define cvtINT16toShort(val) (val)
+#define cvtINT32toShort(val) (val)
+#define cvtINT8toLong(val) (val)
+#define cvtINT16toLong(val) (val)
+#define cvtINT32toLong(val) (val)
+#endif /* WORD64 and UNSIGNEDBITFIELDS */
+
+
+
+#ifdef MUSTCOPY
+/*
+ * This macro must not cast or else pointers will get aligned and be wrong
+ */
+#define NEXTPTR(p,t)  (((char *) p) + SIZEOF(t))
+#else /* else not MUSTCOPY, this is used for 32-bit machines */
+/*
+ * this version should leave result of type (t *), but that should only be 
+ * used when not in MUSTCOPY
+ */  
+#define NEXTPTR(p,t) (((t *)(p)) + 1)
+#endif /* MUSTCOPY - used machines whose C structs don't line up with proto */
+
+#endif /* XMD_H */