diff options
| author | Holger Hans Peter Freyther <holger@moiji-mobile.com> | 2015-03-22 09:03:42 +0100 |
|---|---|---|
| committer | Holger Hans Peter Freyther <holger@moiji-mobile.com> | 2015-03-22 09:03:42 +0100 |
| commit | 249a81b7ff57d39af843cd267b60c0ce0400ce8d (patch) | |
| tree | eefee95a51e4c9ffa2810bb993c074b0097cc6df | |
| parent | 789334640f2c34e58b9f3a8c19c57ac15bd2ed38 (diff) | |
endian: Be able to detect endian on GNU and BSD
On GNU __BYTE_ORDER and __LITTLE_ENDIAN is defined and
the include is "endian.h" on FreeBSD it is "sys/endian.h"
and LITTLE_ENDIAN/_LITTLE_ENDIAN and BYTE_ORDER/_BYTE_ORDER
is defined.
Create a header file that defines OSMO_IS_LITTLE_ENDIAN
and OSMO_IS_BIG_ENDIAN and can be used as
#if OSMO_IS_LITTLE_ENDIAN
do_little_endian
#elif OSMO_IS_BIG_ENDIAN
do_big_endian
#else
#error "Unknown endian"
#endif
| -rw-r--r-- | include/Makefile.am | 1 | ||||
| -rw-r--r-- | include/osmocom/core/endian.h | 38 |
2 files changed, 39 insertions, 0 deletions
diff --git a/include/Makefile.am b/include/Makefile.am index 347f641a..181431b7 100644 --- a/include/Makefile.am +++ b/include/Makefile.am @@ -14,6 +14,7 @@ nobase_include_HEADERS = \ osmocom/core/crc64gen.h \ osmocom/core/crc8gen.h \ osmocom/core/crcgen.h \ + osmocom/core/endian.h \ osmocom/core/defs.h \ osmocom/core/gsmtap.h \ osmocom/core/gsmtap_util.h \ diff --git a/include/osmocom/core/endian.h b/include/osmocom/core/endian.h new file mode 100644 index 00000000..c890fd72 --- /dev/null +++ b/include/osmocom/core/endian.h @@ -0,0 +1,38 @@ +#pragma once + +/** + * GNU and FreeBSD have various ways to express the + * endianess but none of them is similiar enough. This + * will create two defines that allows to decide on the + * endian. The following will be defined to either 0 or + * 1 at the end of the file. + * + * OSMO_IS_LITTLE_ENDIAN + * OSMO_IS_BIG_ENDIAN + * + */ + +#if defined(__FreeBSD__) +#include <sys/endian.h> + #if BYTE_ORDER == LITTLE_ENDIAN + #define OSMO_IS_LITTLE_ENDIAN 1 + #define OSMO_IS_BIG_ENDIAN 0 + #elif BYTE_ORDER == BIG_ENDIAN + #define OSMO_IS_LITTLE_ENDIAN 0 + #define OSMO_IS_BIG_ENDIAN 1 + #else + #error "Unknown endian" + #endif +#else +#include <endian.h> + #if __BYTE_ORDER == __LITTLE_ENDIAN + #define OSMO_IS_LITTLE_ENDIAN 1 + #define OSMO_IS_BIG_ENDIAN 0 + #elif __BYTE_ORDER == __BIG_ENDIAN + #define OSMO_IS_LITTLE_ENDIAN 0 + #define OSMO_IS_BIG_ENDIAN 1 + #else + #error "Unknown endian" + #endif +#endif + |