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[perl5.git] / mg.h

/*    mg.h
 *
 *    Copyright (c) 1991-1997, Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

#ifdef STRUCT_MGVTBL_DEFINITION
STRUCT_MGVTBL_DEFINITION;
#else
struct mgvtbl {
    int		(CPERLscope(*svt_get))	_((SV *sv, MAGIC* mg));
    int		(CPERLscope(*svt_set))	_((SV *sv, MAGIC* mg));
    U32		(CPERLscope(*svt_len))	_((SV *sv, MAGIC* mg));
    int		(CPERLscope(*svt_clear))	_((SV *sv, MAGIC* mg));
    int		(CPERLscope(*svt_free))	_((SV *sv, MAGIC* mg));
};
#endif

struct magic {
    MAGIC*	mg_moremagic;
    MGVTBL*	mg_virtual;	/* pointer to magic functions */
    U16		mg_private;
    char	mg_type;
    U8		mg_flags;
    SV*		mg_obj;
    char*	mg_ptr;
    I32		mg_len;
};

#define MGf_TAINTEDDIR 1
#define MGf_REFCOUNTED 2
#define MGf_GSKIP      4

#define MGf_MINMATCH   1

#define MgTAINTEDDIR(mg)	(mg->mg_flags & MGf_TAINTEDDIR)
#define MgTAINTEDDIR_on(mg)	(mg->mg_flags |= MGf_TAINTEDDIR)
#define MgTAINTEDDIR_off(mg)	(mg->mg_flags &= ~MGf_TAINTEDDIR)

#define MgPV(mg,lp)		(((lp = (mg)->mg_len) == HEf_SVKEY) ?   \
				 SvPV((SV*)((mg)->mg_ptr),lp) :		\
				 (mg)->mg_ptr)

#define SvTIED_mg(sv,how) \
    (SvRMAGICAL(sv) ? mg_find((sv),(how)) : Null(MAGIC*))
#define SvTIED_obj(sv,mg) \
    ((mg)->mg_obj ? (mg)->mg_obj : sv_2mortal(newRV(sv)))