WMath.cpp

/*
  Copyright (c) 2014 Arduino.  All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

extern "C" {
  #include "stdlib.h"
  #include "stdint.h"
}

void randomSeed( uint32_t dwSeed )
{
  if ( dwSeed != 0 )
  {
    srand( dwSeed ) ;
  }
}

long random( long howbig )
{
  if ( howbig == 0 )
  {
    return 0 ;
  }

  return rand() % howbig;
}

long random( long howsmall, long howbig )
{
  if (howsmall >= howbig)
  {
    return howsmall;
  }

  long diff = howbig - howsmall;

  return random(diff) + howsmall;
}