max_pow2.c

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#include <grass/gis.h>
#include <grass/gmath.h>


long G_math_max_pow2(const long n)
{
    long p2, n1;

    n1 = n >> 1;
    p2 = 1;
    while (n1 > 0) {
        n1 >>= 1;
        p2 <<= 1;
    }
    if (p2 < n)
        p2 <<= 1;

    return (p2);
}


long G_math_min_pow2(const long n)
{
    long p2, n1;

    n1 = n >> 1;
    p2 = 1;
    while (n1 > 0) {
        n1 >>= 1;
        p2 <<= 1;
    }

    return (p2);
}