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misc.c
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/*****************************************************************************
* misc.c: Miscellaneous support functions.
*
* WARNING! This codebase uses an uncommon variable naming convention. It makes
* sense--with an explanation--I swear! Please see the README.
*
* ---------------------------------------------------------------------------
*
* Copyright (C) 2009 Adam J. DiCarlo <adam.dicarlo@gmail.com>
*
* This file is part of Robby the Robot.
*
* Robby the Robot is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Robby the Robot 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*****************************************************************************/
#include <stdlib.h> /* rand() */
#include "error.h" /* ASSERT() */
#include "misc.h"
/* Swap two pointers */
void SwapPointers(void** ppvLeft, void** ppvRight) {
ASSERT(ppvLeft && ppvRight && *ppvLeft && *ppvRight);
void* pvHold;
pvHold = *ppvLeft;
*ppvLeft = *ppvRight;
*ppvRight = pvHold;
}
/* Sum array of ints */
int Sum(const int n[], int c) {
ASSERT(n);
ASSERT(n > 0); /* n<0: definite bug; n==0: likely bug */
int i, nSum = 0;
for (i = 0; i < c; ++i) {
nSum += n[i];
}
return nSum;
}
/* Grab random number between 0.0 and 1.0 inclusive, at least
* theoretically (if the RAND_MAX cast is represented accurately
* in double-precision floating point) */
double RandomZeroOne() {
return (double)rand() / (double)RAND_MAX;
}