/**********************************************************************
 *
 *   char *
 *   G_gisbase()
 *
 *   returns:    pointer to string containing the base directory of
 *               GRASS-GRID
 **********************************************************************/

#include <grass/gis.h>


/*!
 * \brief top level module directory
 *
 * Returns the full
 * path name of the top level directory for GRASS programs.  This directory will
 * have subdirectories which will contain modules and files required for the
 * running of the system. Some of these directories are:
 \code
 bin    commands run by the user
 etc    modules and data files used by GRASS commands
 txt    help files
 menu   files used by the <i>grass3</i> menu interface
 \endcode
 * The use of G_gisbase( ) to find these subdirectories enables GRASS modules 
 * to be written independently of where the GRASS system is actually installed 
 * on the machine. For example, to run the module <i>sroff</i> in the GRASS 
 * <i>etc</i> directory:
 \code
 char command[200];

 sprintf (command, "%s/etc/sroff", G_gisbase( ) );
 G_spawn (command, "sroff", NULL);
 \endcode
 *
 *  \param void
 *  \return char * 
 */

const char *G_gisbase(void)
{
    return G_getenv("GISBASE");
}