File wiring_math.cpp

File List > arduino > src > wiring > wiring_math.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
*/

#include <Arduino.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;
}