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nall: Support all the names endian.h provides on common platforms. 

Also, moved the snippet that includes endian.h beneath the "Endian detection"
header, since I think it fits more neatly there.

Fixes #77.
This commit is contained in:
Tim Allen 2020-10-30 18:01:10 +11:00 committed by Screwtapello
parent 6b38388a67
commit 216bcee66b
1 changed files with 34 additions and 10 deletions
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44
nall/intrinsics.hpp
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@ -117,14 +117,6 @@ namespace nall {
}
#if defined(PLATFORM_MACOS)
#include <machine/endian.h>
#elif defined(PLATFORM_LINUX)
#include <endian.h>
#elif defined(PLATFORM_BSD)
#include <sys/endian.h>
#endif
/* Architecture detection */
namespace nall {
@ -157,12 +149,44 @@ namespace nall {
/* Endian detection */
#if defined(PLATFORM_MACOS)
#include <machine/endian.h>
#elif defined(PLATFORM_LINUX)
#include <endian.h>
#elif defined(PLATFORM_BSD)
#include <sys/endian.h>
#endif
namespace nall {
#if (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && __BYTE_ORDER == __LITTLE_ENDIAN) || defined(__LITTLE_ENDIAN__) || defined(__i386__) || defined(__amd64__) || defined(_M_IX86) || defined(_M_AMD64)
// A note on endian constants: Traditional UNIX provides a header that defines
// constants LITTLE_ENDIAN, BIG_ENDIAN, and BYTE_ORDER (set to LITTLE_ENDIAN or
// BIG_ENDIAN as appropriate). However, C89 says that the compiler/libc should
// not introduce any names unless they start with an underscore, so when you're
// compiling in standards-compilant mode, those constants are named
// __LITTLE_ENDIAN, or sometimes _LITTLE_ENDIAN, or sometimes even LITTLE_ENDIAN
// on platforms that care more about tradition than standards. The platforms
// that rename the constants usually provide some other name you can #define to
// say, "forget C89, yes I really want traditional constant names", but *that*
// name also differs from platform to platform, and it affects more than just
// the endian header.
//
// Rather than wade into that mess, let's just test for all the constants we
// know about.
#if (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && __BYTE_ORDER == __LITTLE_ENDIAN) \
|| (defined( _BYTE_ORDER) && defined( _LITTLE_ENDIAN) && _BYTE_ORDER == _LITTLE_ENDIAN) \
|| (defined( BYTE_ORDER) && defined( LITTLE_ENDIAN) && BYTE_ORDER == LITTLE_ENDIAN) \
|| defined(__LITTLE_ENDIAN__) \
|| defined(__i386__) || defined(__amd64__) \
|| defined(_M_IX86) || defined(_M_AMD64)
#define ENDIAN_LSB
constexpr auto endian() -> Endian { return Endian::LSB; }
#elif (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && __BYTE_ORDER == __BIG_ENDIAN) || defined(__BIG_ENDIAN__) || defined(__powerpc__) || defined(_M_PPC)
#elif(defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && __BYTE_ORDER == __BIG_ENDIAN) \
|| (defined( _BYTE_ORDER) && defined( _BIG_ENDIAN) && _BYTE_ORDER == _BIG_ENDIAN) \
|| (defined( BYTE_ORDER) && defined( BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN) \
|| defined(__BIG_ENDIAN__) \
|| defined(__powerpc__) || defined(_M_PPC)
#define ENDIAN_MSB
constexpr auto endian() -> Endian { return Endian::MSB; }
#else