[perl5.git] / ext / PerlIO / Via / Via.xs

#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifdef PERLIO_LAYERS

#include "perliol.h"

typedef struct
{
 struct _PerlIO base;       /* Base "class" info */
 HV *		stash;
 SV *		obj;
 SV *		var;
 SSize_t	cnt;
 IO *		io;
 SV *		fh;
 CV *PUSHED;
 CV *POPPED;
 CV *OPEN;
 CV *FDOPEN;
 CV *SYSOPEN;
 CV *GETARG;
 CV *FILENO;
 CV *READ;
 CV *WRITE;
 CV *FILL;
 CV *CLOSE;
 CV *SEEK;
 CV *TELL;
 CV *UNREAD;
 CV *FLUSH;
 CV *SETLINEBUF;
 CV *CLEARERR;
 CV *mERROR;
 CV *mEOF;
} PerlIOVia;

#define MYMethod(x) #x,&s->x

CV *
PerlIOVia_fetchmethod(pTHX_ PerlIOVia *s,char *method,CV **save)
{
 GV *gv = gv_fetchmeth(s->stash,method,strlen(method),0);
#if 0
 Perl_warn(aTHX_ "Lookup %s::%s => %p",HvNAME(s->stash),method,gv);
#endif
 if (gv)
  {
   return *save = GvCV(gv);
  }
 else
  {
   return *save = (CV *) -1;
  }
}

SV *
PerlIOVia_method(pTHX_ PerlIO *f,char *method,CV **save,int flags,...)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 CV *cv = (*save) ? *save : PerlIOVia_fetchmethod(aTHX_ s,method,save);
 SV *result = Nullsv;
 va_list ap;
 va_start(ap,flags);
 if (cv != (CV *)-1)
  {
   IV count;
   dSP;
   SV *arg;
   ENTER;
   PUSHMARK(sp);
   XPUSHs(s->obj);
   while ((arg = va_arg(ap,SV *)))
    {
     XPUSHs(arg);
    }
   if (*PerlIONext(f))
    {
     if (!s->fh)
      {
       GV *gv = newGVgen(HvNAME(s->stash));
       GvIOp(gv) = newIO();
       s->fh  = newRV_noinc((SV *)gv);
       s->io  = GvIOp(gv);
      }
     IoIFP(s->io) = PerlIONext(f);
     IoOFP(s->io) = PerlIONext(f);
     XPUSHs(s->fh);
    }
   PUTBACK;
   count = call_sv((SV *)cv,flags);
   if (count)
    {
     SPAGAIN;
     result = POPs;
     PUTBACK;
    }
   else
    {
     result = &PL_sv_undef;
    }
   LEAVE;
  }
 va_end(ap);
 return result;
}

IV
PerlIOVia_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg)
{
 IV code = PerlIOBase_pushed(aTHX_ f,mode,Nullsv);
 if (code == 0)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   if (!arg)
    {
     if (ckWARN(WARN_LAYER))
      Perl_warner(aTHX_ packWARN(WARN_LAYER), "No package specified");
     code = -1;
    }
   else
    {
     STRLEN pkglen = 0;
     char *pkg = SvPV(arg,pkglen);
     s->obj = SvREFCNT_inc(arg);
     s->stash  = gv_stashpvn(pkg, pkglen, FALSE);
     if (s->stash)
      {
       SV *modesv = (mode) ? sv_2mortal(newSVpvn(mode,strlen(mode))) : Nullsv;
       SV *result = PerlIOVia_method(aTHX_ f,MYMethod(PUSHED),G_SCALAR,modesv,Nullsv);
       if (result)
        {
         if (sv_isobject(result))
          {
           s->obj = SvREFCNT_inc(result);
           SvREFCNT_dec(arg);
          }
         else if (SvIV(result) != 0)
          return SvIV(result);
        }
       if (PerlIOVia_fetchmethod(aTHX_ s,MYMethod(FILL)) == (CV *) -1)
        PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
       else
        PerlIOBase(f)->flags |= PERLIO_F_FASTGETS;
      }
     else
      {
       if (ckWARN(WARN_LAYER))
         Perl_warner(aTHX_ packWARN(WARN_LAYER), "Cannot find package '%.*s'",(int) pkglen,pkg);
#ifdef ENOSYS
       errno = ENOSYS;
#else
#ifdef ENOENT
       errno = ENOENT;
#endif
#endif
       code = -1;
      }
    }
  }
 return code;
}

PerlIO *
PerlIOVia_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers, IV n, const char *mode, int fd, int imode, int perm, PerlIO *f, int narg, SV **args)
{
 if (!f)
  {
   f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX),self,mode,PerlIOArg);
  }
 else
  {
   if (!PerlIO_push(aTHX_ f,self,mode,PerlIOArg))
    return NULL;
  }
 if (f)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   SV *result = Nullsv;
   if (fd >= 0)
    {
     SV *fdsv = sv_2mortal(newSViv(fd));
     result = PerlIOVia_method(aTHX_ f,MYMethod(FDOPEN),G_SCALAR,fdsv,Nullsv);
    }
   else if (narg > 0)
    {
     if (*mode == '#')
      {
       SV *imodesv = sv_2mortal(newSViv(imode));
       SV *permsv  = sv_2mortal(newSViv(perm));
       result = PerlIOVia_method(aTHX_ f,MYMethod(SYSOPEN),G_SCALAR,*args,imodesv,permsv,Nullsv);
      }
     else
      {
       result = PerlIOVia_method(aTHX_ f,MYMethod(OPEN),G_SCALAR,*args,Nullsv);
      }
    }
   if (result)
    {
     if (sv_isobject(result))
      s->obj = SvREFCNT_inc(result);
     else if (!SvTRUE(result))
      {
       return NULL;
      }
    }
   else
    return NULL;
  }
 return f;
}

IV
PerlIOVia_popped(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 PerlIOVia_method(aTHX_ f,MYMethod(POPPED),G_VOID,Nullsv);
 if (s->var)
  {
   SvREFCNT_dec(s->var);
   s->var = Nullsv;
  }

 if (s->io)
  {
   IoIFP(s->io) = NULL;
   IoOFP(s->io) = NULL;
  }
 if (s->fh)
  {
   SvREFCNT_dec(s->fh);
   s->fh  = Nullsv;
   s->io  = NULL;
  }
 if (s->obj)
  {
   SvREFCNT_dec(s->obj);
   s->obj = Nullsv;
  }
 return 0;
}

IV
PerlIOVia_close(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 IV code = PerlIOBase_close(aTHX_ f);
 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(CLOSE),G_SCALAR,Nullsv);
 if (result && SvIV(result) != 0)
  code = SvIV(result);
 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF|PERLIO_F_WRBUF);
 return code;
}

IV
PerlIOVia_fileno(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILENO),G_SCALAR,Nullsv);
 return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
}

IV
PerlIOVia_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *offsv  = sv_2mortal(newSViv(offset));
 SV *whsv   = sv_2mortal(newSViv(whence));
 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(SEEK),G_SCALAR,offsv,whsv,Nullsv);
 return (result) ? SvIV(result) : -1;
}

Off_t
PerlIOVia_tell(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(TELL),G_SCALAR,Nullsv);
 return (result) ? (Off_t) SvIV(result) : (Off_t) -1;
}

SSize_t
PerlIOVia_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *buf    = sv_2mortal(newSVpvn((char *)vbuf,count));
 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(UNREAD),G_SCALAR,buf,Nullsv);
 if (result)
  return (SSize_t) SvIV(result);
 else
  {
   return PerlIOBase_unread(aTHX_ f,vbuf,count);
  }
}

SSize_t
PerlIOVia_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
{
 SSize_t rd = 0;
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)
    {
     rd = PerlIOBase_read(aTHX_ f,vbuf,count);
    }
   else
    {
     PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
     SV *buf    = sv_2mortal(newSV(count));
     SV *n      = sv_2mortal(newSViv(count));
     SV *result = PerlIOVia_method(aTHX_ f,MYMethod(READ),G_SCALAR,buf,n,Nullsv);
     if (result)
      {
       rd = (SSize_t) SvIV(result);
       Move(SvPVX(buf),vbuf,rd,char);
       return rd;
      }
    }
  }
 return rd;
}

SSize_t
PerlIOVia_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   SV *buf    = newSVpvn((char *)vbuf,count);
   SV *result = PerlIOVia_method(aTHX_ f,MYMethod(WRITE),G_SCALAR,buf,Nullsv);
   SvREFCNT_dec(buf);
   if (result)
    return (SSize_t) SvIV(result);
   return -1;
  }
 return 0;
}

IV
PerlIOVia_fill(pTHX_ PerlIO *f)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILL),G_SCALAR,Nullsv);
   if (s->var)
    {
     SvREFCNT_dec(s->var);
     s->var = Nullsv;
    }
   if (result && SvOK(result))
    {
     STRLEN len = 0;
     char *p = SvPV(result,len);
     s->var = newSVpvn(p,len);
     s->cnt = SvCUR(s->var);
     return 0;
    }
   else
    PerlIOBase(f)->flags |= PERLIO_F_EOF;
  }
 return -1;
}

IV
PerlIOVia_flush(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FLUSH),G_SCALAR,Nullsv);
 if (s->var && s->cnt > 0)
  {
   SvREFCNT_dec(s->var);
   s->var = Nullsv;
  }
 return (result) ? SvIV(result) : 0;
}

STDCHAR *
PerlIOVia_get_base(pTHX_ PerlIO *f)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   if (s->var)
    {
     return (STDCHAR *)SvPVX(s->var);
    }
  }
 return (STDCHAR *) Nullch;
}

STDCHAR *
PerlIOVia_get_ptr(pTHX_ PerlIO *f)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   if (s->var)
    {
     STDCHAR *p = (STDCHAR *)(SvEND(s->var) - s->cnt);
     return p;
    }
  }
 return (STDCHAR *) Nullch;
}

SSize_t
PerlIOVia_get_cnt(pTHX_ PerlIO *f)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   if (s->var)
    {
     return s->cnt;
    }
  }
 return 0;
}

Size_t
PerlIOVia_bufsiz(pTHX_ PerlIO *f)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   if (s->var)
    return SvCUR(s->var);
  }
 return 0;
}

void
PerlIOVia_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR *ptr, SSize_t cnt)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 s->cnt = cnt;
}

void
PerlIOVia_setlinebuf(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 PerlIOVia_method(aTHX_ f,MYMethod(SETLINEBUF),G_VOID,Nullsv);
 PerlIOBase_setlinebuf(aTHX_ f);
}

void
PerlIOVia_clearerr(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 PerlIOVia_method(aTHX_ f,MYMethod(CLEARERR),G_VOID,Nullsv);
 PerlIOBase_clearerr(aTHX_ f);
}

IV
PerlIOVia_error(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *result = PerlIOVia_method(aTHX_ f,"ERROR",&s->mERROR,G_SCALAR,Nullsv);
 return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
}

IV
PerlIOVia_eof(pTHX_ PerlIO *f)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *result = PerlIOVia_method(aTHX_ f,"EOF",&s->mEOF,G_SCALAR,Nullsv);
 return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
}

SV *
PerlIOVia_getarg(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
{
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 return PerlIOVia_method(aTHX_ f,MYMethod(GETARG),G_SCALAR,Nullsv);
}

PerlIO *
PerlIOVia_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
{
 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags)))
  {
   /* Most of the fields will lazily set themselves up as needed
      stash and obj have been set up by the implied push
    */
  }
 return f;
}

PerlIO_funcs PerlIO_object = {
 "Via",
 sizeof(PerlIOVia),
 PERLIO_K_BUFFERED|PERLIO_K_DESTRUCT,
 PerlIOVia_pushed,
 PerlIOVia_popped,
 NULL, /* PerlIOVia_open, */
 PerlIOVia_getarg,
 PerlIOVia_fileno,
 PerlIOVia_dup,
 PerlIOVia_read,
 PerlIOVia_unread,
 PerlIOVia_write,
 PerlIOVia_seek,
 PerlIOVia_tell,
 PerlIOVia_close,
 PerlIOVia_flush,
 PerlIOVia_fill,
 PerlIOVia_eof,
 PerlIOVia_error,
 PerlIOVia_clearerr,
 PerlIOVia_setlinebuf,
 PerlIOVia_get_base,
 PerlIOVia_bufsiz,
 PerlIOVia_get_ptr,
 PerlIOVia_get_cnt,
 PerlIOVia_set_ptrcnt,
};


#endif /* Layers available */

MODULE = PerlIO::Via	PACKAGE = PerlIO::Via
PROTOTYPES: ENABLE;

BOOT:
{
#ifdef PERLIO_LAYERS
 PerlIO_define_layer(aTHX_ &PerlIO_object);
#endif
}
Commit	Line	Data
e7a1fdd7 NIS	1	#define PERL_NO_GET_CONTEXT
	2	#include "EXTERN.h"
	3	#include "perl.h"
	4	#include "XSUB.h"
	5	#ifdef PERLIO_LAYERS
	6
	7	#include "perliol.h"
	8
	9	typedef struct
	10	{
	11	struct _PerlIO base; /* Base "class" info */
	12	HV * stash;
	13	SV * obj;
	14	SV * var;
	15	SSize_t cnt;
e7a1fdd7 NIS	16	IO * io;
	17	SV * fh;
	18	CV *PUSHED;
	19	CV *POPPED;
	20	CV *OPEN;
	21	CV *FDOPEN;
	22	CV *SYSOPEN;
	23	CV *GETARG;
	24	CV *FILENO;
	25	CV *READ;
	26	CV *WRITE;
	27	CV *FILL;
	28	CV *CLOSE;
	29	CV *SEEK;
	30	CV *TELL;
	31	CV *UNREAD;
	32	CV *FLUSH;
	33	CV *SETLINEBUF;
	34	CV *CLEARERR;
c7997937	35	CV *mERROR;
e7a1fdd7 NIS	36	CV *mEOF;
	37	} PerlIOVia;
	38
	39	#define MYMethod(x) #x,&s->x
	40
	41	CV *
	42	PerlIOVia_fetchmethod(pTHX_ PerlIOVia s,char method,CV **save)
	43	{
	44	GV *gv = gv_fetchmeth(s->stash,method,strlen(method),0);
	45	#if 0
	46	Perl_warn(aTHX_ "Lookup %s::%s => %p",HvNAME(s->stash),method,gv);
	47	#endif
	48	if (gv)
	49	{
	50	return *save = GvCV(gv);
	51	}
	52	else
	53	{
	54	return save = (CV ) -1;
	55	}
e7a1fdd7 NIS	56	}
	57
	58	SV *
	59	PerlIOVia_method(pTHX_ PerlIO f,char method,CV **save,int flags,...)
	60	{
	61	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	62	CV cv = (save) ? *save : PerlIOVia_fetchmethod(aTHX_ s,method,save);
	63	SV *result = Nullsv;
	64	va_list ap;
	65	va_start(ap,flags);
	66	if (cv != (CV *)-1)
	67	{
	68	IV count;
	69	dSP;
	70	SV *arg;
e7a1fdd7 NIS	71	ENTER;
	72	PUSHMARK(sp);
	73	XPUSHs(s->obj);
	74	while ((arg = va_arg(ap,SV *)))
	75	{
	76	XPUSHs(arg);
	77	}
	78	if (*PerlIONext(f))
	79	{
	80	if (!s->fh)
	81	{
	82	GV *gv = newGVgen(HvNAME(s->stash));
	83	GvIOp(gv) = newIO();
	84	s->fh = newRV_noinc((SV *)gv);
	85	s->io = GvIOp(gv);
	86	}
	87	IoIFP(s->io) = PerlIONext(f);
	88	IoOFP(s->io) = PerlIONext(f);
	89	XPUSHs(s->fh);
	90	}
	91	PUTBACK;
	92	count = call_sv((SV *)cv,flags);
	93	if (count)
	94	{
	95	SPAGAIN;
	96	result = POPs;
	97	PUTBACK;
	98	}
	99	else
	100	{
	101	result = &PL_sv_undef;
	102	}
	103	LEAVE;
	104	}
	105	va_end(ap);
	106	return result;
	107	}
	108
	109	IV
f62ce20a	110	PerlIOVia_pushed(pTHX_ PerlIO f, const char mode, SV *arg)
e7a1fdd7	111	{
f62ce20a	112	IV code = PerlIOBase_pushed(aTHX_ f,mode,Nullsv);
e7a1fdd7 NIS	113	if (code == 0)
e7a1fdd7 NIS	114	{
e7a1fdd7 NIS	115	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	116	if (!arg)
	117	{
99ef548b PM	118	if (ckWARN(WARN_LAYER))
99ef548b PM	119	Perl_warner(aTHX_ packWARN(WARN_LAYER), "No package specified");
e7a1fdd7 NIS	120	code = -1;
	121	}
	122	else
	123	{
	124	STRLEN pkglen = 0;
	125	char *pkg = SvPV(arg,pkglen);
267cbce7	126	s->obj = SvREFCNT_inc(arg);
e7a1fdd7 NIS	127	s->stash = gv_stashpvn(pkg, pkglen, FALSE);
	128	if (s->stash)
	129	{
	130	SV *modesv = (mode) ? sv_2mortal(newSVpvn(mode,strlen(mode))) : Nullsv;
	131	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(PUSHED),G_SCALAR,modesv,Nullsv);
	132	if (result)
	133	{
	134	if (sv_isobject(result))
267cbce7 NIS	135	{
	136	s->obj = SvREFCNT_inc(result);
	137	SvREFCNT_dec(arg);
	138	}
e7a1fdd7 NIS	139	else if (SvIV(result) != 0)
	140	return SvIV(result);
	141	}
	142	if (PerlIOVia_fetchmethod(aTHX_ s,MYMethod(FILL)) == (CV *) -1)
	143	PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
	144	else
	145	PerlIOBase(f)->flags \|= PERLIO_F_FASTGETS;
	146	}
	147	else
	148	{
99ef548b PM	149	if (ckWARN(WARN_LAYER))
99ef548b PM	150	Perl_warner(aTHX_ packWARN(WARN_LAYER), "Cannot find package '%.*s'",(int) pkglen,pkg);
267cbce7 NIS	151	#ifdef ENOSYS
	152	errno = ENOSYS;
	153	#else
	154	#ifdef ENOENT
	155	errno = ENOENT;
	156	#endif
	157	#endif
e7a1fdd7 NIS	158	code = -1;
	159	}
	160	}
	161	}
	162	return code;
	163	}
	164
	165	PerlIO *
fcf2db38	166	PerlIOVia_open(pTHX_ PerlIO_funcs self, PerlIO_list_t layers, IV n, const char mode, int fd, int imode, int perm, PerlIO f, int narg, SV **args)
e7a1fdd7 NIS	167	{
	168	if (!f)
	169	{
	170	f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX),self,mode,PerlIOArg);
	171	}
	172	else
	173	{
	174	if (!PerlIO_push(aTHX_ f,self,mode,PerlIOArg))
	175	return NULL;
	176	}
	177	if (f)
	178	{
	179	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	180	SV *result = Nullsv;
	181	if (fd >= 0)
	182	{
	183	SV *fdsv = sv_2mortal(newSViv(fd));
	184	result = PerlIOVia_method(aTHX_ f,MYMethod(FDOPEN),G_SCALAR,fdsv,Nullsv);
	185	}
	186	else if (narg > 0)
	187	{
	188	if (*mode == '#')
	189	{
	190	SV *imodesv = sv_2mortal(newSViv(imode));
	191	SV *permsv = sv_2mortal(newSViv(perm));
	192	result = PerlIOVia_method(aTHX_ f,MYMethod(SYSOPEN),G_SCALAR,*args,imodesv,permsv,Nullsv);
	193	}
	194	else
	195	{
	196	result = PerlIOVia_method(aTHX_ f,MYMethod(OPEN),G_SCALAR,*args,Nullsv);
	197	}
	198	}
	199	if (result)
	200	{
	201	if (sv_isobject(result))
	202	s->obj = SvREFCNT_inc(result);
	203	else if (!SvTRUE(result))
	204	{
	205	return NULL;
	206	}
	207	}
	208	else
	209	return NULL;
	210	}
	211	return f;
	212	}
	213
	214	IV
f62ce20a	215	PerlIOVia_popped(pTHX_ PerlIO *f)
e7a1fdd7	216	{
e7a1fdd7 NIS	217	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	218	PerlIOVia_method(aTHX_ f,MYMethod(POPPED),G_VOID,Nullsv);
	219	if (s->var)
	220	{
	221	SvREFCNT_dec(s->var);
	222	s->var = Nullsv;
	223	}
	224
	225	if (s->io)
	226	{
	227	IoIFP(s->io) = NULL;
	228	IoOFP(s->io) = NULL;
	229	}
	230	if (s->fh)
	231	{
	232	SvREFCNT_dec(s->fh);
	233	s->fh = Nullsv;
	234	s->io = NULL;
	235	}
	236	if (s->obj)
	237	{
	238	SvREFCNT_dec(s->obj);
	239	s->obj = Nullsv;
	240	}
	241	return 0;
	242	}
	243
	244	IV
f62ce20a	245	PerlIOVia_close(pTHX_ PerlIO *f)
e7a1fdd7	246	{
e7a1fdd7	247	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
f62ce20a	248	IV code = PerlIOBase_close(aTHX_ f);
e7a1fdd7 NIS	249	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(CLOSE),G_SCALAR,Nullsv);
	250	if (result && SvIV(result) != 0)
	251	code = SvIV(result);
	252	PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF\|PERLIO_F_WRBUF);
	253	return code;
	254	}
	255
	256	IV
f62ce20a	257	PerlIOVia_fileno(pTHX_ PerlIO *f)
e7a1fdd7	258	{
e7a1fdd7 NIS	259	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	260	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILENO),G_SCALAR,Nullsv);
	261	return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
	262	}
	263
	264	IV
f62ce20a	265	PerlIOVia_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
e7a1fdd7	266	{
e7a1fdd7 NIS	267	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7 NIS	268	SV *offsv = sv_2mortal(newSViv(offset));
9f16d962	269	SV *whsv = sv_2mortal(newSViv(whence));
e7a1fdd7 NIS	270	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(SEEK),G_SCALAR,offsv,whsv,Nullsv);
	271	return (result) ? SvIV(result) : -1;
	272	}
	273
	274	Off_t
f62ce20a	275	PerlIOVia_tell(pTHX_ PerlIO *f)
e7a1fdd7	276	{
e7a1fdd7 NIS	277	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7 NIS	278	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(TELL),G_SCALAR,Nullsv);
9f16d962	279	return (result) ? (Off_t) SvIV(result) : (Off_t) -1;
e7a1fdd7 NIS	280	}
	281
	282	SSize_t
f62ce20a	283	PerlIOVia_unread(pTHX_ PerlIO f, const void vbuf, Size_t count)
e7a1fdd7	284	{
e7a1fdd7 NIS	285	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	286	SV buf = sv_2mortal(newSVpvn((char )vbuf,count));
	287	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(UNREAD),G_SCALAR,buf,Nullsv);
	288	if (result)
	289	return (SSize_t) SvIV(result);
	290	else
	291	{
f62ce20a	292	return PerlIOBase_unread(aTHX_ f,vbuf,count);
e7a1fdd7 NIS	293	}
	294	}
	295
	296	SSize_t
f62ce20a	297	PerlIOVia_read(pTHX_ PerlIO f, void vbuf, Size_t count)
e7a1fdd7 NIS	298	{
	299	SSize_t rd = 0;
	300	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	301	{
	302	if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)
	303	{
f62ce20a	304	rd = PerlIOBase_read(aTHX_ f,vbuf,count);
e7a1fdd7 NIS	305	}
	306	else
	307	{
e7a1fdd7 NIS	308	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	309	SV *buf = sv_2mortal(newSV(count));
	310	SV *n = sv_2mortal(newSViv(count));
	311	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(READ),G_SCALAR,buf,n,Nullsv);
	312	if (result)
	313	{
	314	rd = (SSize_t) SvIV(result);
	315	Move(SvPVX(buf),vbuf,rd,char);
	316	return rd;
	317	}
	318	}
	319	}
	320	return rd;
	321	}
	322
	323	SSize_t
f62ce20a	324	PerlIOVia_write(pTHX_ PerlIO f, const void vbuf, Size_t count)
e7a1fdd7 NIS	325	{
	326	if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
	327	{
e7a1fdd7 NIS	328	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	329	SV buf = newSVpvn((char )vbuf,count);
	330	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(WRITE),G_SCALAR,buf,Nullsv);
	331	SvREFCNT_dec(buf);
	332	if (result)
	333	return (SSize_t) SvIV(result);
	334	return -1;
	335	}
	336	return 0;
	337	}
	338
	339	IV
f62ce20a	340	PerlIOVia_fill(pTHX_ PerlIO *f)
e7a1fdd7 NIS	341	{
	342	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	343	{
e7a1fdd7 NIS	344	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	345	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILL),G_SCALAR,Nullsv);
	346	if (s->var)
	347	{
	348	SvREFCNT_dec(s->var);
	349	s->var = Nullsv;
	350	}
	351	if (result && SvOK(result))
	352	{
	353	STRLEN len = 0;
	354	char *p = SvPV(result,len);
	355	s->var = newSVpvn(p,len);
	356	s->cnt = SvCUR(s->var);
	357	return 0;
	358	}
	359	else
	360	PerlIOBase(f)->flags \|= PERLIO_F_EOF;
	361	}
	362	return -1;
	363	}
	364
	365	IV
f62ce20a	366	PerlIOVia_flush(pTHX_ PerlIO *f)
e7a1fdd7	367	{
e7a1fdd7 NIS	368	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	369	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FLUSH),G_SCALAR,Nullsv);
	370	if (s->var && s->cnt > 0)
	371	{
	372	SvREFCNT_dec(s->var);
	373	s->var = Nullsv;
	374	}
	375	return (result) ? SvIV(result) : 0;
	376	}
	377
	378	STDCHAR *
f62ce20a	379	PerlIOVia_get_base(pTHX_ PerlIO *f)
e7a1fdd7 NIS	380	{
	381	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	382	{
e7a1fdd7 NIS	383	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	384	if (s->var)
	385	{
	386	return (STDCHAR *)SvPVX(s->var);
	387	}
	388	}
	389	return (STDCHAR *) Nullch;
	390	}
	391
	392	STDCHAR *
f62ce20a	393	PerlIOVia_get_ptr(pTHX_ PerlIO *f)
e7a1fdd7 NIS	394	{
	395	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	396	{
	397	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	398	if (s->var)
	399	{
e7a1fdd7 NIS	400	STDCHAR p = (STDCHAR )(SvEND(s->var) - s->cnt);
	401	return p;
	402	}
	403	}
	404	return (STDCHAR *) Nullch;
	405	}
	406
	407	SSize_t
f62ce20a	408	PerlIOVia_get_cnt(pTHX_ PerlIO *f)
e7a1fdd7 NIS	409	{
	410	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	411	{
	412	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	413	if (s->var)
	414	{
	415	return s->cnt;
	416	}
	417	}
	418	return 0;
	419	}
	420
	421	Size_t
f62ce20a	422	PerlIOVia_bufsiz(pTHX_ PerlIO *f)
e7a1fdd7 NIS	423	{
	424	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	425	{
	426	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	427	if (s->var)
	428	return SvCUR(s->var);
	429	}
	430	return 0;
	431	}
	432
	433	void
f62ce20a	434	PerlIOVia_set_ptrcnt(pTHX_ PerlIO f, STDCHAR ptr, SSize_t cnt)
e7a1fdd7 NIS	435	{
	436	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	437	s->cnt = cnt;
	438	}
	439
	440	void
f62ce20a	441	PerlIOVia_setlinebuf(pTHX_ PerlIO *f)
e7a1fdd7	442	{
e7a1fdd7 NIS	443	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7 NIS	444	PerlIOVia_method(aTHX_ f,MYMethod(SETLINEBUF),G_VOID,Nullsv);
f62ce20a	445	PerlIOBase_setlinebuf(aTHX_ f);
e7a1fdd7 NIS	446	}
	447
	448	void
f62ce20a	449	PerlIOVia_clearerr(pTHX_ PerlIO *f)
e7a1fdd7	450	{
e7a1fdd7 NIS	451	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7 NIS	452	PerlIOVia_method(aTHX_ f,MYMethod(CLEARERR),G_VOID,Nullsv);
f62ce20a	453	PerlIOBase_clearerr(aTHX_ f);
e7a1fdd7 NIS	454	}
e7a1fdd7 NIS	455
c7997937	456	IV
f62ce20a	457	PerlIOVia_error(pTHX_ PerlIO *f)
e7a1fdd7	458	{
e7a1fdd7	459	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
c7997937	460	SV *result = PerlIOVia_method(aTHX_ f,"ERROR",&s->mERROR,G_SCALAR,Nullsv);
f62ce20a	461	return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
e7a1fdd7 NIS	462	}
	463
	464	IV
f62ce20a	465	PerlIOVia_eof(pTHX_ PerlIO *f)
e7a1fdd7	466	{
e7a1fdd7 NIS	467	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7 NIS	468	SV *result = PerlIOVia_method(aTHX_ f,"EOF",&s->mEOF,G_SCALAR,Nullsv);
f62ce20a	469	return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
e7a1fdd7 NIS	470	}
e7a1fdd7 NIS	471
ecdeb87c NIS	472	SV *
	473	PerlIOVia_getarg(pTHX_ PerlIO f, CLONE_PARAMS param, int flags)
	474	{
	475	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	476	return PerlIOVia_method(aTHX_ f,MYMethod(GETARG),G_SCALAR,Nullsv);
	477	}
	478
8cf8f3d1	479	PerlIO *
ecdeb87c	480	PerlIOVia_dup(pTHX_ PerlIO f, PerlIO o, CLONE_PARAMS *param, int flags)
8cf8f3d1	481	{
ecdeb87c	482	if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags)))
9f16d962	483	{
ecdeb87c	484	/* Most of the fields will lazily set themselves up as needed
9f16d962 NIS	485	stash and obj have been set up by the implied push
	486	*/
	487	}
	488	return f;
8cf8f3d1 NIS	489	}
8cf8f3d1 NIS	490
e7a1fdd7 NIS	491	PerlIO_funcs PerlIO_object = {
	492	"Via",
	493	sizeof(PerlIOVia),
	494	PERLIO_K_BUFFERED\|PERLIO_K_DESTRUCT,
	495	PerlIOVia_pushed,
	496	PerlIOVia_popped,
	497	NULL, /* PerlIOVia_open, */
	498	PerlIOVia_getarg,
	499	PerlIOVia_fileno,
8cf8f3d1	500	PerlIOVia_dup,
e7a1fdd7 NIS	501	PerlIOVia_read,
	502	PerlIOVia_unread,
	503	PerlIOVia_write,
	504	PerlIOVia_seek,
	505	PerlIOVia_tell,
	506	PerlIOVia_close,
	507	PerlIOVia_flush,
	508	PerlIOVia_fill,
	509	PerlIOVia_eof,
	510	PerlIOVia_error,
	511	PerlIOVia_clearerr,
	512	PerlIOVia_setlinebuf,
	513	PerlIOVia_get_base,
	514	PerlIOVia_bufsiz,
	515	PerlIOVia_get_ptr,
	516	PerlIOVia_get_cnt,
	517	PerlIOVia_set_ptrcnt,
	518	};
	519
	520
	521	#endif /* Layers available */
	522
	523	MODULE = PerlIO::Via PACKAGE = PerlIO::Via
	524	PROTOTYPES: ENABLE;
	525
	526	BOOT:
	527	{
	528	#ifdef PERLIO_LAYERS
	529	PerlIO_define_layer(aTHX_ &PerlIO_object);
	530	#endif
	531	}
	532