LWGEOM_to_latlon()

Datum LWGEOM_to_latlon

(

PG_FUNCTION_ARGS

)

Definition at line 214 of file lwgeom_inout.c.

{
        /* Get the parameters */
        GSERIALIZED *pg_lwgeom = PG_GETARG_GSERIALIZED_P(0);
        text *format_text = PG_GETARG_TEXT_P(1);
 
        LWGEOM *lwgeom;
        char *format_str = NULL;
 
        char * formatted_str;
        text * formatted_text;
        char * tmp;
 
        /* Only supports points. */
        uint8_t geom_type = gserialized_get_type(pg_lwgeom);
        if (POINTTYPE != geom_type)
        {
                lwpgerror("Only points are supported, you tried type %s.", lwtype_name(geom_type));
        }
        /* Convert to LWGEOM type */
        lwgeom = lwgeom_from_gserialized(pg_lwgeom);
 
  if (format_text == NULL) {
    lwpgerror("ST_AsLatLonText: invalid format string (null");
    PG_RETURN_NULL();
  }
 
        if (!lwgeom_isfinite(lwgeom)) {
    lwpgerror("ST_AsLatLonText: invalid coordinate");
    PG_RETURN_NULL();
  }
 
        format_str = text_to_cstring(format_text);
  assert(format_str != NULL);
 
  /* The input string supposedly will be in the database encoding,
     so convert to UTF-8. */
  tmp = (char *)pg_do_encoding_conversion(
    (uint8_t *)format_str, strlen(format_str), GetDatabaseEncoding(), PG_UTF8);
  assert(tmp != NULL);
  if ( tmp != format_str ) {
    pfree(format_str);
    format_str = tmp;
  }
 
        /* Produce the formatted string. */
        formatted_str = lwpoint_to_latlon((LWPOINT *)lwgeom, format_str);
  assert(formatted_str != NULL);
  pfree(format_str);
 
  /* Convert the formatted string from UTF-8 back to database encoding. */
  tmp = (char *)pg_do_encoding_conversion(
    (uint8_t *)formatted_str, strlen(formatted_str),
    PG_UTF8, GetDatabaseEncoding());
  assert(tmp != NULL);
  if ( tmp != formatted_str) {
    pfree(formatted_str);
    formatted_str = tmp;
  }
 
        /* Convert to the postgres output string type. */
        formatted_text = cstring_to_text(formatted_str);
  pfree(formatted_str);
 
        PG_RETURN_POINTER(formatted_text);
}

References gserialized_get_type(), lwgeom_from_gserialized(), lwgeom_isfinite(), lwpoint_to_latlon(), lwtype_name(), and POINTTYPE.

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