vector/Vlib/read.c

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#include <grass/Vect.h>
#include <grass/glocale.h>

static int read_next_dummy()
{
    return -1;
}

#ifndef HAVE_OGR
static int format()
{
    G_fatal_error(_("Requested format is not compiled in this version"));
    return 0;
}
#endif

static int (*Read_next_line_array[][3]) () = {
    {
    read_next_dummy, V1_read_next_line_nat, V2_read_next_line_nat}
#ifdef HAVE_OGR
    , {
    read_next_dummy, V1_read_next_line_ogr, V2_read_next_line_ogr}
#else
    , {
    read_next_dummy, format, format}
#endif
};

static int (*V2_read_line_array[]) () = {
    V2_read_line_nat
#ifdef HAVE_OGR
        , V2_read_line_ogr
#else
        , format
#endif
};

int Vect_read_next_line(struct Map_info *Map,
                        struct line_pnts *line_p, struct line_cats *line_c)
{

    G_debug(3, "Vect_read_next_line()");

    if (!VECT_OPEN(Map))
        return -1;

    return (*Read_next_line_array[Map->format][Map->level]) (Map, line_p,
                                                             line_c);
}

int Vect_read_line(struct Map_info *Map,
                   struct line_pnts *line_p, struct line_cats *line_c, int line)
{

    G_debug(3, "Vect_read_line()");

    if (!VECT_OPEN(Map))
        G_fatal_error("Vect_read_line(): %s", _("vector map is not opened"));

    if (line < 1 || line > Map->plus.n_lines)
        G_fatal_error(_("Vect_read_line(): feature id %d is not reasonable "
                        "(max features in vector map <%s>: %d)"),
                      line, Vect_get_full_name(Map), Map->plus.n_lines);

    return (*V2_read_line_array[Map->format]) (Map, line_p, line_c, line);
}

int Vect_line_alive(struct Map_info *Map, int line)
{
    if (Map->plus.Line[line] != NULL)
        return 1;
    
    return 0;
}

int Vect_node_alive(struct Map_info *Map, int node)
{
    if (Map->plus.Node[node] != NULL)
        return 1;

    return 0;
}

int Vect_area_alive(struct Map_info *Map, int area)
{
    if (Map->plus.Area[area] != NULL)
        return 1;

    return 0;
}

int Vect_isle_alive(struct Map_info *Map, int isle)
{
    if (Map->plus.Isle[isle] != NULL)
        return 1;

    return 0;
}

long Vect_get_line_offset(const struct Map_info *Map, int line)
{
    if (line < 1 || line > Map->plus.n_lines)
        return -1;
    
    if (Map->plus.Line[line] != NULL) {
        return Map->plus.Line[line]->offset;
    }
    
    return -1;
}