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/* mg.h
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999,
* 2000, 2002, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/

struct mgvtbl {
    int (*svt_get) (pTHX_ SV *sv, MAGIC* mg);
    int (*svt_set) (pTHX_ SV *sv, MAGIC* mg);
    U32 (*svt_len) (pTHX_ SV *sv, MAGIC* mg);
    int (*svt_clear)(pTHX_ SV *sv, MAGIC* mg);
    int (*svt_free) (pTHX_ SV *sv, MAGIC* mg);
    int (*svt_copy) (pTHX_ SV *sv, MAGIC* mg,
     SV *nsv, const char *name, I32 namlen);
    int (*svt_dup) (pTHX_ MAGIC *mg, CLONE_PARAMS *param);
    int (*svt_local)(pTHX_ SV *nsv, MAGIC *mg);
};

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

#define MGf_TAINTEDDIR 1 /* PERL_MAGIC_envelem only */
#define MGf_MINMATCH 1 /* PERL_MAGIC_regex_global only */
#define MGf_REFCOUNTED 2
#define MGf_GSKIP 4 /* skip further GETs until after next SET */
#define MGf_COPY 8 /* has an svt_copy MGVTBL entry */
#define MGf_DUP 0x10 /* has an svt_dup MGVTBL entry */
#define MGf_LOCAL 0x20 /* has an svt_local MGVTBL entry */
#define MGf_BYTES 0x40 /* PERL_MAGIC_regex_global only */

#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) ((((int)(lp = (mg)->mg_len)) == HEf_SVKEY) ? \
SvPV(MUTABLE_SV((mg)->mg_ptr),lp) : \
(mg)->mg_ptr)
#define MgPV_const(mg,lp) ((((int)(lp = (mg)->mg_len)) == HEf_SVKEY) ? \
SvPV_const(MUTABLE_SV((mg)->mg_ptr),lp) : \
(const char*)(mg)->mg_ptr)
#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \
SvPV_nolen_const(MUTABLE_SV((mg)->mg_ptr)) : \
(const char*)(mg)->mg_ptr)

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

#if defined(PERL_CORE) || defined(PERL_EXT)
# define MgBYTEPOS(mg,sv,pv,len) S_MgBYTEPOS(aTHX_ mg,sv,pv,len)
/* assumes get-magic and stringification have already occurred */
# define MgBYTEPOS_set(mg,sv,pv,off) ( \
assert_((mg)->mg_type == PERL_MAGIC_regex_global) \
SvPOK(sv) && !SvGMAGICAL(sv) \
? (mg)->mg_len = (off), (mg)->mg_flags |= MGf_BYTES \
: ((mg)->mg_len = DO_UTF8(sv) \
? (SSize_t)utf8_length((U8 *)(pv), (U8 *)(pv)+(off)) \
: (SSize_t)(off), \
(mg)->mg_flags &= ~MGf_BYTES))
#endif

#define whichsig(pv) whichsig_pv(pv)

/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*
* ex: set ts=8 sts=4 sw=4 et:
*/
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