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https://github.com/openvswitch/ovs
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42a1d93e29
This is convenient in expressions, e.g. "uuid = x ? *x : UUID_ZERO;". Signed-off-by: Ben Pfaff <blp@ovn.org> Acked-by: Andy Zhou <azhou@ovn.org>
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/* Copyright (c) 2008, 2009, 2010, 2016 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef UUID_H
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#define UUID_H 1
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#include "openvswitch/uuid.h"
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/* An initializer or expression for an all-zero UUID. */
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#define UUID_ZERO ((struct uuid) { .parts = { 0, 0, 0, 0 } })
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/* Formats a UUID as a string, in the conventional format.
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*
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* Example:
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* struct uuid uuid = ...;
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* printf("This UUID is "UUID_FMT"\n", UUID_ARGS(&uuid));
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*
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*/
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#define UUID_LEN 36
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#define UUID_FMT "%08x-%04x-%04x-%04x-%04x%08x"
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#define UUID_ARGS(UUID) \
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((unsigned int) ((UUID)->parts[0])), \
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((unsigned int) ((UUID)->parts[1] >> 16)), \
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((unsigned int) ((UUID)->parts[1] & 0xffff)), \
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((unsigned int) ((UUID)->parts[2] >> 16)), \
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((unsigned int) ((UUID)->parts[2] & 0xffff)), \
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((unsigned int) ((UUID)->parts[3]))
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/* Returns a hash value for 'uuid'. This hash value is the same regardless of
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* whether we are running on a 32-bit or 64-bit or big-endian or little-endian
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* architecture. */
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static inline size_t
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uuid_hash(const struct uuid *uuid)
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{
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return uuid->parts[0];
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}
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/* Returns true if 'a == b', false otherwise. */
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static inline bool
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uuid_equals(const struct uuid *a, const struct uuid *b)
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{
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return (a->parts[0] == b->parts[0]
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&& a->parts[1] == b->parts[1]
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&& a->parts[2] == b->parts[2]
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&& a->parts[3] == b->parts[3]);
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}
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void uuid_init(void);
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void uuid_generate(struct uuid *);
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void uuid_zero(struct uuid *);
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bool uuid_is_zero(const struct uuid *);
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int uuid_compare_3way(const struct uuid *, const struct uuid *);
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bool uuid_from_string(struct uuid *, const char *);
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bool uuid_from_string_prefix(struct uuid *, const char *);
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int uuid_is_partial_string(const char *);
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void uuid_set_bits_v4(struct uuid *);
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#endif /* uuid.h */
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