short_way.c

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#include <grass/gis.h>


int G_shortest_way(double *east1, double *east2)
{
    if (G_projection() == PROJECTION_LL) {
        if (*east1 > *east2)
            while ((*east1 - *east2) > 180)
                *east2 += 360;
        else if (*east2 > *east1)
            while ((*east2 - *east1) > 180)
                *east1 += 360;
    }

    return 0;
}