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/*
* Copyright (C) 2013 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup sys_random Random
* @ingroup sys
* @brief Pseudo Random Number Generator (PRNG)
* @{
*
* @file
* @brief Common interface to the software PRNG
*
* Various implementations of a PRNG are available:
* - Tiny Mersenne Twister (default)
* - Mersenne Twister
* - Simple Park-Miller PRNG
* - Musl C PRNG
*/
#ifndef RANDOM_H
#define RANDOM_H
#include <inttypes.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef PRNG_FLOAT
# define PRNG_FLOAT (0)
#endif
/**
* @brief initializes PRNG with a seed
*
* @param s seed for the PRNG
*/
void random_init(uint32_t s);
/**
* @brief initialize by an array with array-length
* init_key is the array for initializing keys
* key_length is its length
* slight change for C++, 2004/2/26
*
* @param init_key array of keys (seeds) to initialize the PRNG
* @param key_length number of lements in init_key
*/
void random_init_by_array(uint32_t init_key[], int key_length);
/**
* @brief generates a random number on [0,0xffffffff]-interval
* @return a random number on [0,0xffffffff]-interval
*/
uint32_t random_uint32(void);
/**
* @brief generates a random number r with a <= r < b.
*
* @param[in] a minimum for random number
* @param[in] b upper bound for random number
*
* @pre a < b
*
* @return a random number on [a,b)-interval
*/
static inline uint32_t random_uint32_range(uint32_t a, uint32_t b)
{
return (random_uint32() % (b - a)) + a;
}
#if PRNG_FLOAT
/* These real versions are due to Isaku Wada, 2002/01/09 added */
/**
* @brief generates a random number on [0,1)-real-interval
* @return a random number on [0,1)-real-interval
*/
double random_real(void);
/**
* @brief generates a random number on [0,1]-real-interval
* @return a random number on [0,1]-real-interval
*/
double random_real_inclusive(void);
/**
* @brief generates a random number on (0,1)-real-interval
* @return a random number on (0,1)-real-interval
*/
double random_real_exclusive(void);
/**
* @brief generates a random number on [0,1) with 53-bit resolution
* @return a random number on [0,1) with 53-bit resolution
*/
double random_res53(void);
#endif /* PRNG_FLOAT */
#ifdef __cplusplus
}
#endif
#endif /* RANDOM_H */
/** @} */
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