rand1.c

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#include <grass/config.h>
#include <stdlib.h>
#include <grass/gmath.h>


float G_math_rand(int seed)
{
#if defined(HAVE_DRAND48)
    if (seed < 0)
        srand48(-seed);

    return (float)drand48();
#else
    if (seed < 0)
        srand(-seed);

    return 1.0f * rand() / RAND_MAX;
#endif
}