rewind_ogr.c

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/*!
   \file lib/vector/Vlib/rewind_ogr.c
 
   \brief Vector library - rewind data (OGR)
 
   Higher level functions for reading/writing/manipulating vectors.
 
   (C) 2001-2009, 2011 by the GRASS Development Team
 
   This program is free software under the GNU General Public License
   (>=v2). Read the file COPYING that comes with GRASS for details.
 
   \author Radim Blazek, Piero Cavalieri
 */
 
#include <grass/vector.h>
#include <grass/glocale.h>
 
#ifdef HAVE_OGR
#include <ogr_api.h>
#endif
 
/*!
   \brief Rewind vector map (OGR layer) to cause reads to start at
   beginning (level 1)
 
   \param Map pointer to Map_info structure
 
   \return 0 on success
   \return -1 on error
 */
int V1_rewind_ogr(struct Map_info *Map)
{
    G_debug(2, "V1_rewind_ogr(): name = %s", Map->name);
#ifdef HAVE_OGR
    struct Format_info_ogr *ogr_info;
 
    ogr_info = &(Map->fInfo.ogr);
 
    ogr_info->cache.lines_num = 0;
    ogr_info->cache.lines_next = 0;
 
    OGR_L_ResetReading(ogr_info->layer);
 
    return 0;
#else
    G_fatal_error(_("GRASS is not compiled with OGR support"));
    return -1;
#endif
}
 
/*!
   \brief Rewind vector map (OGR layer) to cause reads to start at
   beginning on topological level (level 2)
 
   \param Map pointer to Map_info structure
 
   \return 0 on success
   \return -1 on error
 */
int V2_rewind_ogr(struct Map_info *Map)
{
    G_debug(2, "V2_rewind_ogr(): name = %s", Map->name);
#ifdef HAVE_OGR
    Map->next_line = 1;
 
    V1_rewind_ogr(Map);
 
    return 0;
#else
    G_fatal_error(_("GRASS is not compiled with OGR support"));
    return -1;
#endif
}