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add implementation for random/randomSeed#255

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wxyyy0117 wants to merge1 commit intoarduino:masterfromwxyyy0117:fix_random_test
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59 changes: 59 additions & 0 deletionsapi/WMath.cpp
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,59 @@
/*
Copyright (c) 2011 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
*/

//****************************************************************************
// @Project Includes
//****************************************************************************
extern "C" {
#include "stdlib.h"
#include "stdint.h"
}



//****************************************************************************
// @Local Functions
//****************************************************************************

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;
}

//****************************************************************************
// END OF FILE
//****************************************************************************
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