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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (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.openairinterface.org/?page_id=698
*
* 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.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
#include <time.h>
#include <stdlib.h>
unsigned int s0, s1, s2, b;
//----------------------------------------------
//
/*!
*/
//
unsigned int taus(void)
{
b = (((s0 << 13) ^ s0) >> 19);
s0 = (((s0 & 0xFFFFFFFE) << 12)^ b);
b = (((s1 << 2) ^ s1) >> 25);
s1 = (((s1 & 0xFFFFFFF8) << 4)^ b);
b = (((s2 << 3) ^ s2) >> 11);
s2 = (((s2 & 0xFFFFFFF0) << 17)^ b);
return s0 ^ s1 ^ s2;
}
#if 1
void set_taus_seed(unsigned int seed_init)
{
struct drand48_data buffer;
unsigned long result = 0;
if (seed_init == 0) {
s0 = (unsigned int)time(NULL);
s1 = (unsigned int)time(NULL);
s2 = (unsigned int)time(NULL);
} else {
/* Use reentrant version of rand48 to ensure that no conflicts with other generators occur */
srand48_r((long int)seed_init, &buffer);
mrand48_r(&buffer, (long int *)&result);
s0 = result;
mrand48_r(&buffer, (long int *)&result);
s1 = result;
mrand48_r(&buffer, (long int *)&result);
s2 = result;
}
}
#endif
#ifdef MAIN
main()
{
unsigned int i,rand;
set_taus_seed();
for (i=0; i<10; i++) {
rand = taus();
printf("%u\n",rand);
}
}
#endif //MAIN