add some ugly byte swapping cruft in endian.h

include/endian.h

@@ -8,10 +8,69 @@
 #include <bits/endian.h>
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+
 #define BIG_ENDIAN __BIG_ENDIAN
 #define LITTLE_ENDIAN __LITTLE_ENDIAN
 #define PDP_ENDIAN __PDP_ENDIAN
 #define BYTE_ORDER __BYTE_ORDER
+
+#include <stdint.h>
+
+static inline uint16_t __bswap16(uint16_t __x)
+{
+	return __x<<8 | __x>>8;
+}
+
+static inline uint32_t __bswap32(uint32_t __x)
+{
+	return __x>>24 | __x>>8&0xff00 | __x<<8&0xff0000 | __x<<24;
+}
+
+static inline uint64_t __bswap64(uint64_t __x)
+{
+	return __bswap_32(__x)+0ULL<<32 | __bswap_32(__x>>32);
+}
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define htobe16(x) __bswap16(x)
+#define be16toh(x) __bswap16(x)
+#define betoh16(x) __bswap16(x)
+#define htobe32(x) __bswap32(x)
+#define be32toh(x) __bswap32(x)
+#define betoh32(x) __bswap32(x)
+#define htobe64(x) __bswap64(x)
+#define be64toh(x) __bswap64(x)
+#define betoh64(x) __bswap64(x)
+#define htole16(x) (uint16_t)(x)
+#define le16toh(x) (uint16_t)(x)
+#define letoh16(x) (uint16_t)(x)
+#define htole32(x) (uint32_t)(x)
+#define le32toh(x) (uint32_t)(x)
+#define letoh32(x) (uint32_t)(x)
+#define htole64(x) (uint64_t)(x)
+#define le64toh(x) (uint64_t)(x)
+#define letoh64(x) (uint64_t)(x)
+#else
+#define htobe16(x) (uint16_t)(x)
+#define be16toh(x) (uint16_t)(x)
+#define betoh16(x) (uint16_t)(x)
+#define htobe32(x) (uint32_t)(x)
+#define be32toh(x) (uint32_t)(x)
+#define betoh32(x) (uint32_t)(x)
+#define htobe64(x) (uint64_t)(x)
+#define be64toh(x) (uint64_t)(x)
+#define betoh64(x) (uint64_t)(x)
+#define htole16(x) __bswap16(x)
+#define le16toh(x) __bswap16(x)
+#define letoh16(x) __bswap16(x)
+#define htole32(x) __bswap32(x)
+#define le32toh(x) __bswap32(x)
+#define letoh32(x) __bswap32(x)
+#define htole64(x) __bswap64(x)
+#define le64toh(x) __bswap64(x)
+#define letoh64(x) __bswap64(x)
+#endif
+
 #endif
 
 #endif