859e1ce63a
Change-Id: I5c9f0c9acf5af71f01beceaf06ebe0a2c87676bc Signed-off-by: chao.an <anchao@xiaomi.com>
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/****************************************************************************
|
|
* libs/libc/uuid/lib_uuid_create.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <stdlib.h>
|
|
#include <uuid.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* uuid_create_nil
|
|
*
|
|
* Description:
|
|
* Create an UUID.
|
|
*
|
|
* See also:
|
|
* http://www.opengroup.org/onlinepubs/009629399/uuid_create.htm
|
|
*
|
|
****************************************************************************/
|
|
|
|
void uuid_create(uuid_t *u, uint32_t *status)
|
|
{
|
|
#ifdef CONFIG_CRYPTO_RANDOM_POOL
|
|
arc4random_buf(u, sizeof(uuid_t));
|
|
#else
|
|
unsigned long *beg = (unsigned long *)u;
|
|
unsigned long *end = (unsigned long *)(u + 1);
|
|
|
|
while (beg < end)
|
|
{
|
|
*beg++ = rand();
|
|
}
|
|
#endif
|
|
|
|
u->clock_seq_hi_and_reserved &= ~(1 << 6);
|
|
u->clock_seq_hi_and_reserved |= (1 << 7);
|
|
|
|
u->time_hi_and_version &= ~(1 << 12);
|
|
u->time_hi_and_version &= ~(1 << 13);
|
|
u->time_hi_and_version |= (1 << 14);
|
|
u->time_hi_and_version &= ~(1 << 15);
|
|
|
|
if (status)
|
|
{
|
|
*status = uuid_s_ok;
|
|
}
|
|
}
|