endian.h: add BSD extensions when _BSD_SOURCE is defined.

headers/posix/endian.h

@@ -7,7 +7,9 @@
 
 
 #include <config/HaikuConfig.h>
-
+#ifdef _BSD_SOURCE
+#include <support/ByteOrder.h>
+#endif
 
 /* Defines architecture dependent endian constants.
  * The constant reflects the byte order, "4" is the most
@@ -28,4 +30,49 @@
 #define __LITTLE_ENDIAN		LITTLE_ENDIAN
 #define __BYTE_ORDER		BYTE_ORDER
 
+#ifdef _BSD_SOURCE
+
+/*
+ * General byte order swapping functions.
+ */
+#define	bswap16(x)	__swap_int16(x)
+#define	bswap32(x)	__swap_int32(x)
+#define	bswap64(x)	__swap_int64(x)
+
+/*
+ * Host to big endian, host to little endian, big endian to host, and little
+ * endian to host byte order functions as detailed in byteorder(9).
+ */
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define	htobe16(x)	bswap16((x))
+#define	htobe32(x)	bswap32((x))
+#define	htobe64(x)	bswap64((x))
+#define	htole16(x)	((uint16_t)(x))
+#define	htole32(x)	((uint32_t)(x))
+#define	htole64(x)	((uint64_t)(x))
+
+#define	be16toh(x)	bswap16((x))
+#define	be32toh(x)	bswap32((x))
+#define	be64toh(x)	bswap64((x))
+#define	le16toh(x)	((uint16_t)(x))
+#define	le32toh(x)	((uint32_t)(x))
+#define	le64toh(x)	((uint64_t)(x))
+#else /* BYTE_ORDER != LITTLE_ENDIAN */
+#define	htobe16(x)	((uint16_t)(x))
+#define	htobe32(x)	((uint32_t)(x))
+#define	htobe64(x)	((uint64_t)(x))
+#define	htole16(x)	bswap16((x))
+#define	htole32(x)	bswap32((x))
+#define	htole64(x)	bswap64((x))
+
+#define	be16toh(x)	((uint16_t)(x))
+#define	be32toh(x)	((uint32_t)(x))
+#define	be64toh(x)	((uint64_t)(x))
+#define	le16toh(x)	bswap16((x))
+#define	le32toh(x)	bswap32((x))
+#define	le64toh(x)	bswap64((x))
+#endif /* BYTE_ORDER == LITTLE_ENDIAN */
+
+#endif /* _BSD_SOURCE */
+
 #endif	/* _ENDIAN_H_ */