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/*
A "32-bit Multiply with carry: random number generator.
Has a list of recommended multipliers. Very fast and good.
multiply-with-carry generator" x(n) = a*x(n-1) + carry mod 2^32.
period" (a*2^31)-1
*/
#ifndef _utl_random_h
#define _utl_random_h
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
/* ------- Includes ---------- */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
/* ------- Definitions ------- */
/*
* Macros that return random number in a specific format. See utl_random()
* below for details. Float values are in the range [0.0-1.0].
*/
#define utl_randomInt(c) ((int)utl_random(c))
#define utl_randomFloat(c) ((double)utl_random(c)/(unsigned long)0xffffffff)
typedef struct {
unsigned int a;
unsigned int x;
unsigned int c;
unsigned int ah;
unsigned int al;
} RND_CTX;
/* ---- Function Prototypes -------- */
#ifdef WIN32
#ifdef BUILD_DLL
#define DLLINTERFACE __declspec(dllexport)
#else
#define DLLINTERFACE __declspec(dllimport)
#endif
#else
#define DLLINTERFACE
#endif
/*
* utl_randomInit: Initialize random number generator with two integers.
*
* Paramaters:
*
* rndContext pointer to context structure
* xi, ci integers that define the random sequence
*
* Return value:
*
* none
*
* Note: The random sequence of numbers returned by utl_random() is the
* same for the same two integers and has a period of 2^31.
*
*/
DLLINTERFACE void utl_randomInit(RND_CTX * rndContext, unsigned int xi,
unsigned int ci);
/*
* utl_randomInitTime: Initialize random number generator with the time
*
* Parameters:
*
* rndContext pointer to context structure
*
* Return value:
*
* none
*
*/
DLLINTERFACE void utl_randomInitTime(RND_CTX * rndContext);
/*
* utl_random: Returns random numbers
*
* Parameters:
*
* rndContext pointer to context structure
*
* Return value:
*
* random number (32bit unsigned integer)
*
* Note: utl_randomInit() or utl_randomInitTime() must have been called
* before using this function.
*
*/
DLLINTERFACE unsigned int utl_random(RND_CTX * rndContext);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
};
#endif
#endif /* _utl_random_h */