As far as I can tell I have set the dir_fd file up to be full of double values:
dir_buf = G_allocate_d_raster_buf();
dir_id = G_open_cell_old(dir_name, dir_mapset);
tempfile3 = G_tempfile();
dir_fd = open(tempfile3, O_RDWR | O_CREAT);
//cn: transfer dir input map to a temp file
for (i = 0; i < nrows; i++) {
G_get_d_raster_row(dir_id, dir_buf, i);
//get_row(dir_id, dir_buf, i);
write(dir_fd, dir_buf, sizeof(DCELL));
}
G_close_cell(dir_id);
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