staging: lustre: obdclass: simplify class_uuid_unparse

#include "../include/obd_support.h"

#include "../include/obd_class.h"

static inline __u32 consume(int nob, __u8 **ptr)

{

	__u32 value;

	LASSERT(nob <= sizeof(value));

	for (value = 0; nob > 0; --nob)

		value = (value << 8) | *((*ptr)++);

	return value;

}

#define CONSUME(val, ptr) (val) = consume(sizeof(val), (ptr))

static void uuid_unpack(class_uuid_t in, __u16 *uu, int nr)

{

	__u8 *ptr = in;

	LASSERT(nr * sizeof(*uu) == sizeof(class_uuid_t));

	while (nr-- > 0)

		CONSUME(uu[nr], &ptr);

}

void class_uuid_unparse(class_uuid_t uu, struct obd_uuid *out)

{

	/* uu as an array of __u16's */

	__u16 uuid[sizeof(class_uuid_t) / sizeof(__u16)];

	CLASSERT(ARRAY_SIZE(uuid) == 8);

	uuid_unpack(uu, uuid, ARRAY_SIZE(uuid));

	sprintf(out->uuid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x",

		uuid[0], uuid[1], uuid[2], uuid[3],

		uuid[4], uuid[5], uuid[6], uuid[7]);

	sprintf(out->uuid, "%pU", uu);

}

EXPORT_SYMBOL(class_uuid_unparse);