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


/* 
 * do_histogram() - Creates histogram for CELL
 *
 * RETURN: EXIT_SUCCESS / EXIT_FAILURE
 */
int do_histogram (char *name, char *mapset)
{
    CELL *cell;
    struct Cell_head cellhd;
    struct Cell_stats statf;
    int nrows, ncols;
    int row;
    int fd;

    if (G_get_cellhd(name, mapset, &cellhd) < 0)
        return EXIT_FAILURE;

    G_set_window(&cellhd);
    if ((fd = G_open_cell_old(name, mapset)) < 0)
        return EXIT_FAILURE;

    nrows = G_window_rows();
    ncols = G_window_cols();
    cell = G_allocate_cell_buf();

    G_init_cell_stats(&statf);
    for (row = 0; row < nrows; row++) {
        if (G_get_map_row_nomask(fd, cell, row) < 0)
            break;

        G_update_cell_stats(cell, ncols, &statf);
    }

    if (row == nrows)
        G_write_histogram_cs(name, &statf);

    G_free_cell_stats(&statf);
    G_close_cell(fd);
    G_free(cell);

    if (row == nrows)
        return EXIT_SUCCESS;

    return EXIT_FAILURE;
}