/* Size_t:
 *	This symbol holds the type used to declare length parameters
 *	for string functions.  It is usually size_t, but may be
 *	unsigned long, int, etc.  It may be necessary to include
 *	<sys/types.h> to get any typedef'ed information.
 */
#define Size_t size_t	 /* length paramater for string functions */

#define MEM_SIZE Size_t

typedef MEM_SIZE STRLEN;

    STRLEN      xpv_cur;        /* length of svu_pv as a C string */
    STRLEN      xpv_len         /* allocated size */