/usr/include/simgear/nasal/naref.h is in libsimgear-dev 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | #ifndef _NAREF_H
#define _NAREF_H
/* Rather than play elaborate and complicated games with
* platform-dependent endianness headers, just detect the platforms we
* support. This list is simpler and smaller, yet still quite
* complete. */
#if (defined(__x86_64) && defined(__linux__)) || defined(__sparcv9) || \
defined(__powerpc64__)
/* Win64 and Irix should work with this too, but have not been
* tested */
# define NASAL_NAN64
#elif defined(_M_IX86) || defined(i386) || defined(__x86_64) || \
defined(__ia64__) || defined(_M_IA64) || defined(__ARMEL__) || \
defined(_M_X64) || defined(__alpha__) || \
(defined(__sh__) && defined(__LITTLE_ENDIAN__))
# define NASAL_LE
#elif defined(__sparc) || defined(__ppc__) || defined(__PPC) || \
defined (__powerpc__) || defined (__powerpc64__) || defined (__alpha__) || \
defined(__mips) || defined(__ARMEB__) || \
defined(__hppa__) || defined(__s390__) || defined(__s390x__) || \
(defined(__sh__) && !defined(__LITTLE_ENDIAN__))
# define NASAL_BE
#else
# error Unrecognized CPU architecture
#endif
typedef union {
struct naObj* obj;
struct naStr* str;
struct naVec* vec;
struct naHash* hash;
struct naCode* code;
struct naFunc* func;
struct naCCode* ccode;
struct naGhost* ghost;
} naPtr;
/* On supported 64 bit platforms (those where all memory returned from
* naAlloc() is guaranteed to lie between 0 and 2^48-1) we union the
* double with the pointer, and use fancy tricks (see data.h) to make
* sure all pointers are stored as NaNs. 32 bit layouts (and 64 bit
* platforms where we haven't tested the trick above) need
* endianness-dependent ordering to make sure that the reftag lies in
* the top bits of the double */
#if defined(NASAL_LE)
typedef struct { naPtr ptr; int reftag; } naRefPart;
#elif defined(NASAL_BE)
typedef struct { int reftag; naPtr ptr; } naRefPart;
#endif
#if defined(NASAL_NAN64)
typedef union { double num; void* ptr; } naRef;
#else
typedef union { double num; naRefPart ref; } naRef;
#endif
#endif // _NAREF_H
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