晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/perl5/CORE/mg.h
/*    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_REQUIRE_GV 1        /* PERL_MAGIC_checkcall 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 MGf_PERSIST    0x80     /* PERL_MAGIC_lvref 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) || sv_only_taint_gmagic(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)

/*
 * ex: set ts=8 sts=4 sw=4 et:
 */

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