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/* Copyright (c) 2008, 2009, 2010, 2016, 2017 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef UUID_H
#define UUID_H 1
#include "util.h"
#include "openvswitch/uuid.h"
#ifdef __cplusplus
extern "C" {
#endif
/* An initializer or expression for an all-zero UUID. */
#define UUID_ZERO ((struct uuid) { .parts = { 0, 0, 0, 0 } })
/* Formats a UUID as a string, in the conventional format.
*
* Example:
* struct uuid uuid = ...;
* printf("This UUID is "UUID_FMT"\n", UUID_ARGS(&uuid));
*
*/
#define UUID_LEN 36
#define UUID_FMT "%08x-%04x-%04x-%04x-%04x%08x"
#define UUID_ARGS(UUID) \
((unsigned int) ((UUID)->parts[0])), \
((unsigned int) ((UUID)->parts[1] >> 16)), \
((unsigned int) ((UUID)->parts[1] & 0xffff)), \
((unsigned int) ((UUID)->parts[2] >> 16)), \
((unsigned int) ((UUID)->parts[2] & 0xffff)), \
((unsigned int) ((UUID)->parts[3]))
/* Returns a hash value for 'uuid'. This hash value is the same regardless of
* whether we are running on a 32-bit or 64-bit or big-endian or little-endian
* architecture. */
static inline size_t
uuid_hash(const struct uuid *uuid)
{
return uuid->parts[0];
}
/* Returns true if 'a == b', false otherwise. */
static inline bool
uuid_equals(const struct uuid *a, const struct uuid *b)
{
return (a->parts[0] == b->parts[0]
&& a->parts[1] == b->parts[1]
&& a->parts[2] == b->parts[2]
&& a->parts[3] == b->parts[3]);
}
/* Returns the first 'n' hex digits of 'uuid', for 0 < 'n' <= 8.
*
* This is useful for displaying a few leading digits of the uuid, e.g. to
* display 4 digits:
* printf("%04x", uuid_prefix(uuid, 4));
*/
static inline unsigned int
uuid_prefix(const struct uuid *uuid, int digits)
{
return (uuid->parts[0] >> (32 - 4 * digits));
}
/* Returns a string representation of a UUID.
*
* The string is allocated on the heap. Ownership of the string is
* transferred to the caller.
*/
static inline char *
uuid_to_string(const struct uuid *uuid)
{
char *data = xmalloc(UUID_LEN + 1);
snprintf(data, UUID_LEN + 1, UUID_FMT, UUID_ARGS(uuid));
return data;
}
void uuid_init(void);
void uuid_generate(struct uuid *);
struct uuid uuid_random(void);
void uuid_zero(struct uuid *);
bool uuid_is_zero(const struct uuid *);
int uuid_compare_3way(const struct uuid *, const struct uuid *);
bool uuid_from_string(struct uuid *, const char *);
bool uuid_from_string_prefix(struct uuid *, const char *);
int uuid_is_partial_string(const char *);
int uuid_is_partial_match(const struct uuid *, const char *match);
void uuid_set_bits_v4(struct uuid *);
#ifdef __cplusplus
}
#endif
#endif /* uuid.h */
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