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| author | Eric S. Raymond <esr@thyrsus.com> | 2013-11-05 20:44:58 -0500 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2013-11-05 21:26:40 -0500 |
| commit | 9a2ee06ee166dec94a78541c646c8d2a9f0a06be (patch) | |
| tree | 28e55ab69d22888789b418188d4a5a9a1c873e39 /driver_rtcm2.c | |
| parent | edc4eb375078fe61662c12e3909b1002cc1f13eb (diff) | |
| download | gpsd-9a2ee06ee166dec94a78541c646c8d2a9f0a06be.tar.gz | |
Use a clever test for big-endianness.
Diffstat (limited to 'driver_rtcm2.c')
| -rw-r--r-- | driver_rtcm2.c | 29 |
1 files changed, 2 insertions, 27 deletions
diff --git a/driver_rtcm2.c b/driver_rtcm2.c index 5c8532e1..3e249aa2 100644 --- a/driver_rtcm2.c +++ b/driver_rtcm2.c @@ -61,32 +61,7 @@ BSD terms apply: see the file COPYING in the distribution root for details. #include "gpsd.h" -/* - __BIG_ENDIAN__ and __LITTLE_ENDIAN__ are define in some gcc versions - only, probably depending on the architecture. Try to use endian.h if - the gcc way fails - endian.h also doesn not seem to be available on all - platforms. -*/ -#ifdef __BIG_ENDIAN__ -#define WORDS_BIGENDIAN 1 -#else /* __BIG_ENDIAN__ */ -#ifdef __LITTLE_ENDIAN__ -#undef WORDS_BIGENDIAN -#else -#ifdef BSD -#include <sys/endian.h> -#else -#include <endian.h> -#endif -#if __BYTE_ORDER == __BIG_ENDIAN -#define WORDS_BIGENDIAN 1 -#elif __BYTE_ORDER == __LITTLE_ENDIAN -#undef WORDS_BIGENDIAN -#else -#error "unable to determine endianess!" -#endif /* __BYTE_ORDER */ -#endif /* __LITTLE_ENDIAN__ */ -#endif /* __BIG_ENDIAN__ */ +#define IS_BIG_ENDIAN (*(uint16_t *)"\0\xff" < 0x100) /* * Structures for interpreting words in an RTCM-104 2.x message (after @@ -135,7 +110,7 @@ BSD terms apply: see the file COPYING in the distribution root for details. * Reminder: Emacs reverse-region is useful... */ -#ifndef WORDS_BIGENDIAN /* little-endian, like x86 */ +#ifndef IS_BIGENDIAN /* little-endian, like x86 */ struct rtcm2_msg_t { struct rtcm2_msghw1 { /* header word 1 */ |