[lttng-dev] [PATCH babeltrace] Added fallback for betoh/htobe if they do not exist

[Jesper Derehag]

From: Jesper Derehag <jesper.derehag at ericsson.com>

For older systems endian.h may not contain the betoh/htobe macros.
If they are missing, add them and make sure that any user of
htobe/betoh uses include/babeltrace/endian.h and not system endian.h

Signed-off-by: Jesper Derehag <jderehag at hotmail.com>
Tested-by: Jesper Derehag <jderehag at hotmail.com>
---
 formats/lttng-live/lttng-live-comm.c |  1 +
 include/babeltrace/endian.h          | 91 +++++++++++++++++++++++++++++++++++-
 2 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/formats/lttng-live/lttng-live-comm.c b/formats/lttng-live/lttng-live-comm.c
index 9feb718..3aad981 100644
--- a/formats/lttng-live/lttng-live-comm.c
+++ b/formats/lttng-live/lttng-live-comm.c
@@ -50,6 +50,7 @@
 #include <babeltrace/ctf/events-internal.h>
 #include <formats/ctf/events-private.h>
 
+#include <babeltrace/endian.h>
 #include <babeltrace/compat/memstream.h>
 
 #include "lttng-live.h"
diff --git a/include/babeltrace/endian.h b/include/babeltrace/endian.h
index f15a44f..e39e599 100644
--- a/include/babeltrace/endian.h
+++ b/include/babeltrace/endian.h
@@ -47,7 +47,96 @@
 #define BYTE_ORDER     __BYTE_ORDER
 #else
 #include <endian.h>
-#endif
+
+/* htobe/betoh are not defined for glibc <2.9, so add them
+ * explicitly if they are missing */
+# ifdef __USE_BSD
+/* Conversion interfaces.  */
+#  include <byteswap.h>
+
+#  if __BYTE_ORDER == __LITTLE_ENDIAN
+#   ifndef htobe16
+#    define htobe16(x) __bswap_16(x)
+#   endif
+#   ifndef htole16
+#    define htole16(x) (x)
+#   endif
+#   ifndef be16toh
+#    define be16toh(x) __bswap_16(x)
+#   endif
+#   ifndef le16toh
+#    define le16toh(x) (x)
+#   endif
+
+#   ifndef htobe32
+#    define htobe32(x) __bswap_32(x)
+#   endif
+#   ifndef htole32
+#    define htole32(x) (x)
+#   endif
+#   ifndef be32toh
+#    define be32toh(x) __bswap_32(x)
+#   endif
+#   ifndef le32toh
+#    define le32toh(x) (x)
+#   endif
+
+#   ifndef htobe64
+#    define htobe64(x) __bswap_64(x)
+#   endif
+#   ifndef htole64
+#    define htole64(x) (x)
+#   endif
+#   ifndef be64toh
+#    define be64toh(x) __bswap_64(x)
+#   endif
+#   ifndef le64toh
+#    define le64toh(x) (x)
+#   endif
+
+#  else /* __BYTE_ORDER == __LITTLE_ENDIAN */
+#   ifndef htobe16
+#    define htobe16(x) (x)
+#   endif
+#   ifndef htole16
+#    define htole16(x) __bswap_16(x)
+#   endif
+#   ifndef be16toh
+#    define be16toh(x) (x)
+#   endif
+#   ifndef le16toh
+#    define le16toh(x) __bswap_16(x)
+#   endif
+
+#   ifndef htobe32
+#    define htobe32(x) (x)
+#   endif
+#   ifndef htole32
+#    define htole32(x) __bswap_32(x)
+#   endif
+#   ifndef be32toh
+#    define be32toh(x) (x)
+#   endif
+#   ifndef le32toh
+#    define le32toh(x) __bswap_32(x)
+#   endif
+
+#   ifndef htobe64
+#    define htobe64(x) (x)
+#   endif
+#   ifndef htole64
+#    define htole64(x) __bswap_64(x)
+#   endif
+#   ifndef be64toh
+#    define be64toh(x) (x)
+#   endif
+#   ifndef le64toh
+#    define le64toh(x) __bswap_64(x)
+#   endif
+
+#  endif /* __BYTE_ORDER == __LITTLE_ENDIAN */
+# endif /* __USE_BSD */
+#endif /* else -- __FreeBSD__ */
 
 #ifndef FLOAT_WORD_ORDER
 #ifdef __FLOAT_WORD_ORDER
-- 
1.9.1