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/*
* Copyright (C) 2016-2019 "IoT.bzh"
* Author: José Bollo <jose.bollo@iot.bzh>
*
* 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.
*/
#include <stdint.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <uuid/uuid.h>
#include "uuid.h"
/**
* generate a new fresh 'uuid'
*/
void uuid_new_binary(uuid_binary_t uuid)
{
#if defined(USE_UUID_GENERATE)
uuid_generate(uuid);
#else
struct timespec ts;
static uint16_t pid;
static uint16_t counter;
static char state[32];
static struct random_data rdata;
int32_t x;
clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
if (pid == 0) {
pid = (uint16_t)getpid();
counter = (uint16_t)(ts.tv_nsec >> 8);
rdata.state = NULL;
initstate_r((((unsigned)pid) << 16) + ((unsigned)counter),
state, sizeof state, &rdata);
}
ts.tv_nsec ^= (long)ts.tv_sec;
if (++counter == 0)
counter = 1;
uuid[0] = (char)(ts.tv_nsec >> 24);
uuid[1] = (char)(ts.tv_nsec >> 16);
uuid[2] = (char)(ts.tv_nsec >> 8);
uuid[3] = (char)(ts.tv_nsec);
uuid[4] = (char)(pid >> 8);
uuid[5] = (char)(pid);
random_r(&rdata, &x);
uuid[6] = (char)(((x >> 16) & 0x0f) | 0x40); /* pseudo-random version */
uuid[7] = (char)(x >> 8);
random_r(&rdata, &x);
uuid[8] = (char)(((x >> 16) & 0x3f) | 0x80); /* variant RFC4122 */
uuid[9] = (char)(x >> 8);
random_r(&rdata, &x);
uuid[10] = (char)(x >> 16);
uuid[11] = (char)(x >> 8);
random_r(&rdata, &x);
uuid[12] = (char)(x >> 16);
uuid[13] = (char)(x >> 8);
uuid[14] = (char)(counter >> 8);
uuid[15] = (char)(counter);
#endif
}
void uuid_new_stringz(uuid_stringz_t uuid)
{
uuid_t newuuid;
uuid_new_binary(newuuid);
uuid_unparse_lower(newuuid, uuid);
}
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