PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ lwgeom_to_wkt()

char* lwgeom_to_wkt ( const LWGEOM geom,
uint8_t  variant,
int  precision,
size_t *  size_out 
)

WKT emitter function.

Allocates a new *char and fills it with the WKT representation. If size_out is not NULL, it will be set to the size of the allocated *char.

Parameters
variantBitmasked value, accepts one of WKT_ISO, WKT_SFSQL, WKT_EXTENDED.
precisionNumber of significant digits in the output doubles.
size_outIf supplied, will return the size of the returned string, including the null terminator.

Definition at line 669 of file lwout_wkt.c.

References lwerror(), lwgeom_has_srid(), lwgeom_to_wkt_sb(), LWGEOM::srid, stringbuffer_aprintf(), stringbuffer_create(), stringbuffer_destroy(), stringbuffer_getlength(), stringbuffer_getstring(), stringbuffer_getstringcopy(), and WKT_EXTENDED.

Referenced by _lwt_EdgeSplit(), _lwt_FaceByEdges(), _lwt_FindNextRingEdge(), cu_wkt(), cu_wkt_in(), do_encoded_polyline_test(), do_geojson_test(), do_lwgeom_flip_coordinates(), errorIfGeometryCollection(), GenerateLineStringGeometry(), GeneratePointGeometry(), GeneratePolygonGeometry(), gserialized_to_string(), LWGEOM_asEWKT(), LWGEOM_asText(), lwgeom_to_ewkt(), lwgeom_to_text(), lwt_AddLine(), lwt_AddPoint(), lwt_ChangeEdgeGeom(), lwt_GetFaceEdges(), rt_raster_gdal_polygonize(), rt_raster_surface(), test_lwgeom_locate_along(), test_misc_wkb(), test_ptarray_unstroke(), and triangle_parse().

670 {
671  stringbuffer_t *sb;
672  char *str = NULL;
673  if ( geom == NULL )
674  return NULL;
675  sb = stringbuffer_create();
676  /* Extended mode starts with an "SRID=" section for geoms that have one */
677  if ( (variant & WKT_EXTENDED) && lwgeom_has_srid(geom) )
678  {
679  stringbuffer_aprintf(sb, "SRID=%d;", geom->srid);
680  }
681  lwgeom_to_wkt_sb(geom, sb, precision, variant);
682  if ( stringbuffer_getstring(sb) == NULL )
683  {
684  lwerror("Uh oh");
685  return NULL;
686  }
687  str = stringbuffer_getstringcopy(sb);
688  if ( size_out )
689  *size_out = stringbuffer_getlength(sb) + 1;
691  return str;
692 }
int lwgeom_has_srid(const LWGEOM *geom)
Return true or false depending on whether a geometry has a valid SRID set.
Definition: lwgeom.c:1353
uint8_t variant
Definition: cu_in_twkb.c:26
stringbuffer_t * stringbuffer_create(void)
Allocate a new stringbuffer_t.
Definition: stringbuffer.c:35
char * stringbuffer_getstringcopy(stringbuffer_t *s)
Returns a newly allocated string large enough to contain the current state of the string...
Definition: stringbuffer.c:160
int32_t srid
Definition: liblwgeom.h:398
int stringbuffer_aprintf(stringbuffer_t *s, const char *fmt,...)
Appends a formatted string to the current string buffer, using the format and argument list provided...
Definition: stringbuffer.c:253
int stringbuffer_getlength(stringbuffer_t *s)
Returns the length of the current string, not including the null terminator (same behavior as strlen(...
Definition: stringbuffer.c:174
uint8_t precision
Definition: cu_in_twkb.c:25
static void lwgeom_to_wkt_sb(const LWGEOM *geom, stringbuffer_t *sb, int precision, uint8_t variant)
Definition: lwout_wkt.c:600
#define WKT_EXTENDED
Definition: liblwgeom.h:2057
void stringbuffer_destroy(stringbuffer_t *s)
Free the stringbuffer_t and all memory managed within it.
Definition: stringbuffer.c:78
const char * stringbuffer_getstring(stringbuffer_t *s)
Returns a reference to the internal string being managed by the stringbuffer.
Definition: stringbuffer.c:149
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:102
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