6c03a4e4d5
specified by OpenGroup here: https://pubs.opengroup.org/onlinepubs/009629399/toc.htm Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I3bc585e7f4d41f6c2ea70e170276ab0d0399b088
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/****************************************************************************
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* libs/libc/uuid/lib_uuid_create.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/random.h>
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#include <stdlib.h>
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#include <uuid.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* uuid_create_nil
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*
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* Description:
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* Create an UUID.
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*
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* See also:
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* http://www.opengroup.org/onlinepubs/009629399/uuid_create.htm
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*
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****************************************************************************/
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void uuid_create(uuid_t *u, uint32_t *status)
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{
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#ifdef CONFIG_CRYPTO_RANDOM_POOL
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getrandom(u, sizeof(uuid_t));
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#else
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unsigned long *beg = (unsigned long *)u;
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unsigned long *end = (unsigned long *)(u + 1);
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while (beg < end)
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{
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*beg++ = rand();
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}
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#endif
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u->clock_seq_hi_and_reserved &= ~(1 << 6);
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u->clock_seq_hi_and_reserved |= (1 << 7);
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u->time_hi_and_version &= ~(1 << 12);
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u->time_hi_and_version &= ~(1 << 13);
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u->time_hi_and_version |= (1 << 14);
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u->time_hi_and_version &= ~(1 << 15);
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if (status)
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{
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*status = uuid_s_ok;
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}
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}
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