[p5sagit/p5-mst-13.2.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;
 Off_t		posn;
 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;
   int i = 0;
   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(PerlIO *f, const char *mode, SV *arg)
{
 IV code = PerlIOBase_pushed(f,mode,Nullsv);
 if (code == 0)
  {
   dTHX;
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   if (!arg)
    {
     Perl_warn(aTHX_ "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
      {
       Perl_warn(aTHX_ "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, AV *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(PerlIO *f)
{
 dTHX;
 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(PerlIO *f)
{
 dTHX;
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 IV code = PerlIOBase_close(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(PerlIO *f)
{
 dTHX;
 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(PerlIO *f, Off_t offset, int whence)
{
 dTHX;
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *offsv  = sv_2mortal(newSViv(offset));
 SV *whsv   = sv_2mortal(newSViv(offset));
 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(SEEK),G_SCALAR,offsv,whsv,Nullsv);
 return (result) ? SvIV(result) : -1;
}

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

SSize_t
PerlIOVia_unread(PerlIO *f, const void *vbuf, Size_t count)
{
 dTHX;
 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(f,vbuf,count);
  }
}

SSize_t
PerlIOVia_read(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(f,vbuf,count);
    }
   else
    {
     dTHX;
     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(PerlIO *f, const void *vbuf, Size_t count)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
  {
   dTHX;
   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(PerlIO *f)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   dTHX;
   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(PerlIO *f)
{
 dTHX;
 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(PerlIO *f)
{
 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
  {
   dTHX;
   PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
   if (s->var)
    {
     return (STDCHAR *)SvPVX(s->var);
    }
  }
 return (STDCHAR *) Nullch;
}

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

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

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

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

SV *
PerlIOVia_getarg(PerlIO *f)
{
 dTHX;
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 return PerlIOVia_method(aTHX_ f,MYMethod(GETARG),G_SCALAR,Nullsv);
}

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

IV
PerlIOVia_eof(PerlIO *f)
{
 dTHX;
 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
 SV *result = PerlIOVia_method(aTHX_ f,"EOF",&s->mEOF,G_SCALAR,Nullsv);
 return (result) ? SvIV(result) : PerlIOBase_eof(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_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	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;
	16	Off_t posn;
	17	IO * io;
	18	SV * fh;
	19	CV *PUSHED;
	20	CV *POPPED;
	21	CV *OPEN;
	22	CV *FDOPEN;
	23	CV *SYSOPEN;
	24	CV *GETARG;
	25	CV *FILENO;
	26	CV *READ;
	27	CV *WRITE;
	28	CV *FILL;
	29	CV *CLOSE;
	30	CV *SEEK;
	31	CV *TELL;
	32	CV *UNREAD;
	33	CV *FLUSH;
	34	CV *SETLINEBUF;
	35	CV *CLEARERR;
c7997937	36	CV *mERROR;
e7a1fdd7	37	CV *mEOF;
	38	} PerlIOVia;
	39
	40	#define MYMethod(x) #x,&s->x
	41
	42	CV *
	43	PerlIOVia_fetchmethod(pTHX_ PerlIOVia s,char method,CV **save)
	44	{
	45	GV *gv = gv_fetchmeth(s->stash,method,strlen(method),0);
	46	#if 0
	47	Perl_warn(aTHX_ "Lookup %s::%s => %p",HvNAME(s->stash),method,gv);
	48	#endif
	49	if (gv)
	50	{
	51	return *save = GvCV(gv);
	52	}
	53	else
	54	{
	55	return save = (CV ) -1;
	56	}
	57
	58	}
	59
	60	SV *
	61	PerlIOVia_method(pTHX_ PerlIO f,char method,CV **save,int flags,...)
	62	{
	63	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	64	CV cv = (save) ? *save : PerlIOVia_fetchmethod(aTHX_ s,method,save);
	65	SV *result = Nullsv;
	66	va_list ap;
	67	va_start(ap,flags);
	68	if (cv != (CV *)-1)
	69	{
	70	IV count;
	71	dSP;
	72	SV *arg;
	73	int i = 0;
	74	ENTER;
	75	PUSHMARK(sp);
	76	XPUSHs(s->obj);
	77	while ((arg = va_arg(ap,SV *)))
	78	{
	79	XPUSHs(arg);
	80	}
	81	if (*PerlIONext(f))
	82	{
	83	if (!s->fh)
	84	{
	85	GV *gv = newGVgen(HvNAME(s->stash));
	86	GvIOp(gv) = newIO();
	87	s->fh = newRV_noinc((SV *)gv);
	88	s->io = GvIOp(gv);
	89	}
	90	IoIFP(s->io) = PerlIONext(f);
	91	IoOFP(s->io) = PerlIONext(f);
	92	XPUSHs(s->fh);
	93	}
	94	PUTBACK;
	95	count = call_sv((SV *)cv,flags);
	96	if (count)
	97	{
	98	SPAGAIN;
	99	result = POPs;
	100	PUTBACK;
101	}
102	else
103	{
104	result = &PL_sv_undef;
105	}
106	LEAVE;
107	}
108	va_end(ap);
109	return result;
110	}
111
112	IV
113	PerlIOVia_pushed(PerlIO f, const char mode, SV *arg)
114	{
115	IV code = PerlIOBase_pushed(f,mode,Nullsv);
116	if (code == 0)
117	{
118	dTHX;
119	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
120	if (!arg)
121	{
122	Perl_warn(aTHX_ "No package specified");
123	code = -1;
124	}
125	else
126	{
127	STRLEN pkglen = 0;
128	char *pkg = SvPV(arg,pkglen);
267cbce7	129	s->obj = SvREFCNT_inc(arg);
e7a1fdd7	130	s->stash = gv_stashpvn(pkg, pkglen, FALSE);
	131	if (s->stash)
	132	{
	133	SV *modesv = (mode) ? sv_2mortal(newSVpvn(mode,strlen(mode))) : Nullsv;
	134	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(PUSHED),G_SCALAR,modesv,Nullsv);
	135	if (result)
	136	{
	137	if (sv_isobject(result))
267cbce7	138	{
	139	s->obj = SvREFCNT_inc(result);
	140	SvREFCNT_dec(arg);
	141	}
e7a1fdd7	142	else if (SvIV(result) != 0)
	143	return SvIV(result);
	144	}
	145	if (PerlIOVia_fetchmethod(aTHX_ s,MYMethod(FILL)) == (CV *) -1)
	146	PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
	147	else
	148	PerlIOBase(f)->flags \|= PERLIO_F_FASTGETS;
	149	}
	150	else
	151	{
	152	Perl_warn(aTHX_ "Cannot find package '%.*s'",(int) pkglen,pkg);
267cbce7	153	#ifdef ENOSYS
	154	errno = ENOSYS;
	155	#else
	156	#ifdef ENOENT
	157	errno = ENOENT;
	158	#endif
	159	#endif
e7a1fdd7	160	code = -1;
	161	}
	162	}
	163	}
	164	return code;
	165	}
	166
	167	PerlIO *
	168	PerlIOVia_open(pTHX_ PerlIO_funcs self, AV layers, IV n, const char mode, int fd, int imode, int perm, PerlIO f, int narg, SV **args)
	169	{
	170	if (!f)
	171	{
	172	f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX),self,mode,PerlIOArg);
	173	}
	174	else
	175	{
	176	if (!PerlIO_push(aTHX_ f,self,mode,PerlIOArg))
	177	return NULL;
	178	}
	179	if (f)
	180	{
	181	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	182	SV *result = Nullsv;
	183	if (fd >= 0)
	184	{
	185	SV *fdsv = sv_2mortal(newSViv(fd));
	186	result = PerlIOVia_method(aTHX_ f,MYMethod(FDOPEN),G_SCALAR,fdsv,Nullsv);
	187	}
	188	else if (narg > 0)
	189	{
	190	if (*mode == '#')
	191	{
	192	SV *imodesv = sv_2mortal(newSViv(imode));
	193	SV *permsv = sv_2mortal(newSViv(perm));
	194	result = PerlIOVia_method(aTHX_ f,MYMethod(SYSOPEN),G_SCALAR,*args,imodesv,permsv,Nullsv);
	195	}
	196	else
	197	{
	198	result = PerlIOVia_method(aTHX_ f,MYMethod(OPEN),G_SCALAR,*args,Nullsv);
	199	}
	200	}
	201	if (result)
	202	{
	203	if (sv_isobject(result))
	204	s->obj = SvREFCNT_inc(result);
	205	else if (!SvTRUE(result))
	206	{
	207	return NULL;
	208	}
	209	}
	210	else
	211	return NULL;
	212	}
	213	return f;
	214	}
	215
	216	IV
	217	PerlIOVia_popped(PerlIO *f)
	218	{
	219	dTHX;
	220	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	221	PerlIOVia_method(aTHX_ f,MYMethod(POPPED),G_VOID,Nullsv);
	222	if (s->var)
	223	{
224	SvREFCNT_dec(s->var);
225	s->var = Nullsv;
226	}
227
228	if (s->io)
229	{
230	IoIFP(s->io) = NULL;
231	IoOFP(s->io) = NULL;
232	}
233	if (s->fh)
234	{
235	SvREFCNT_dec(s->fh);
236	s->fh = Nullsv;
237	s->io = NULL;
238	}
239	if (s->obj)
240	{
241	SvREFCNT_dec(s->obj);
242	s->obj = Nullsv;
243	}
244	return 0;
245	}
246
247	IV
248	PerlIOVia_close(PerlIO *f)
249	{
250	dTHX;
251	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
252	IV code = PerlIOBase_close(f);
253	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(CLOSE),G_SCALAR,Nullsv);
254	if (result && SvIV(result) != 0)
255	code = SvIV(result);
256	PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF\|PERLIO_F_WRBUF);
257	return code;
258	}
259
260	IV
261	PerlIOVia_fileno(PerlIO *f)
262	{
263	dTHX;
264	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
265	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILENO),G_SCALAR,Nullsv);
266	return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
267	}
268
269	IV
270	PerlIOVia_seek(PerlIO *f, Off_t offset, int whence)
271	{
272	dTHX;
273	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
274	SV *offsv = sv_2mortal(newSViv(offset));
275	SV *whsv = sv_2mortal(newSViv(offset));
276	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(SEEK),G_SCALAR,offsv,whsv,Nullsv);
277	return (result) ? SvIV(result) : -1;
278	}
279
280	Off_t
281	PerlIOVia_tell(PerlIO *f)
282	{
283	dTHX;
284	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
285	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(TELL),G_SCALAR,Nullsv);
286	return (result) ? (Off_t) SvIV(result) : s->posn;
287	}
288
289	SSize_t
290	PerlIOVia_unread(PerlIO f, const void vbuf, Size_t count)
291	{
292	dTHX;
293	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
294	SV buf = sv_2mortal(newSVpvn((char )vbuf,count));
295	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(UNREAD),G_SCALAR,buf,Nullsv);
296	if (result)
297	return (SSize_t) SvIV(result);
298	else
299	{
300	return PerlIOBase_unread(f,vbuf,count);
301	}
302	}
303
304	SSize_t
305	PerlIOVia_read(PerlIO f, void vbuf, Size_t count)
306	{
307	SSize_t rd = 0;
308	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
309	{
310	if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)
311	{
312	rd = PerlIOBase_read(f,vbuf,count);
313	}
314	else
315	{
316	dTHX;
317	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
318	SV *buf = sv_2mortal(newSV(count));
319	SV *n = sv_2mortal(newSViv(count));
320	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(READ),G_SCALAR,buf,n,Nullsv);
321	if (result)
322	{
323	rd = (SSize_t) SvIV(result);
324	Move(SvPVX(buf),vbuf,rd,char);
325	return rd;
326	}
327	}
328	}
329	return rd;
330	}
331
332	SSize_t
333	PerlIOVia_write(PerlIO f, const void vbuf, Size_t count)
334	{
335	if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
336	{
337	dTHX;
338	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
339	SV buf = newSVpvn((char )vbuf,count);
340	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(WRITE),G_SCALAR,buf,Nullsv);
341	SvREFCNT_dec(buf);
342	if (result)
343	return (SSize_t) SvIV(result);
344	return -1;
345	}
346	return 0;
347	}
348
349	IV
350	PerlIOVia_fill(PerlIO *f)
351	{
352	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
353	{
354	dTHX;
355	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
356	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILL),G_SCALAR,Nullsv);
357	if (s->var)
358	{
359	SvREFCNT_dec(s->var);
360	s->var = Nullsv;
361	}
362	if (result && SvOK(result))
363	{
364	STRLEN len = 0;
365	char *p = SvPV(result,len);
366	s->var = newSVpvn(p,len);
367	s->cnt = SvCUR(s->var);
368	return 0;
369	}
370	else
371	PerlIOBase(f)->flags \|= PERLIO_F_EOF;
372	}
373	return -1;
374	}
375
376	IV
377	PerlIOVia_flush(PerlIO *f)
378	{
379	dTHX;
380	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
381	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FLUSH),G_SCALAR,Nullsv);
382	if (s->var && s->cnt > 0)
383	{
384	SvREFCNT_dec(s->var);
385	s->var = Nullsv;
386	}
387	return (result) ? SvIV(result) : 0;
388	}
389
390	STDCHAR *
391	PerlIOVia_get_base(PerlIO *f)
392	{
393	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
394	{
395	dTHX;
396	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
397	if (s->var)
398	{
399	return (STDCHAR *)SvPVX(s->var);
400	}
401	}
402	return (STDCHAR *) Nullch;
403	}
404
405	STDCHAR *
406	PerlIOVia_get_ptr(PerlIO *f)
407	{
408	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
409	{
410	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
411	if (s->var)
412	{
413	dTHX;
414	STDCHAR p = (STDCHAR )(SvEND(s->var) - s->cnt);
415	return p;
416	}
417	}
418	return (STDCHAR *) Nullch;
419	}
420
421	SSize_t
422	PerlIOVia_get_cnt(PerlIO *f)
423	{
424	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
425	{
426	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
427	if (s->var)
428	{
429	return s->cnt;
430	}
431	}
432	return 0;
433	}
434
435	Size_t
436	PerlIOVia_bufsiz(PerlIO *f)
437	{
438	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
439	{
440	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
441	if (s->var)
442	return SvCUR(s->var);
443	}
444	return 0;
445	}
446
447	void
448	PerlIOVia_set_ptrcnt(PerlIO f, STDCHAR ptr, SSize_t cnt)
449	{
450	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
451	s->cnt = cnt;
452	}
453
454	void
455	PerlIOVia_setlinebuf(PerlIO *f)
456	{
457	dTHX;
458	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
459	PerlIOVia_method(aTHX_ f,MYMethod(SETLINEBUF),G_VOID,Nullsv);
460	PerlIOBase_setlinebuf(f);
461	}
462
463	void
464	PerlIOVia_clearerr(PerlIO *f)
465	{
466	dTHX;
467	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
468	PerlIOVia_method(aTHX_ f,MYMethod(CLEARERR),G_VOID,Nullsv);
469	PerlIOBase_clearerr(f);
470	}
471
c7997937	472	SV *
c7997937	473	PerlIOVia_getarg(PerlIO *f)
e7a1fdd7	474	{
	475	dTHX;
	476	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
c7997937	477	return PerlIOVia_method(aTHX_ f,MYMethod(GETARG),G_SCALAR,Nullsv);
e7a1fdd7	478	}
e7a1fdd7	479
c7997937	480	IV
c7997937	481	PerlIOVia_error(PerlIO *f)
e7a1fdd7	482	{
	483	dTHX;
	484	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
c7997937	485	SV *result = PerlIOVia_method(aTHX_ f,"ERROR",&s->mERROR,G_SCALAR,Nullsv);
c7997937	486	return (result) ? SvIV(result) : PerlIOBase_error(f);
e7a1fdd7	487	}
	488
	489	IV
	490	PerlIOVia_eof(PerlIO *f)
	491	{
	492	dTHX;
	493	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	494	SV *result = PerlIOVia_method(aTHX_ f,"EOF",&s->mEOF,G_SCALAR,Nullsv);
	495	return (result) ? SvIV(result) : PerlIOBase_eof(f);
	496	}
	497
	498	PerlIO_funcs PerlIO_object = {
	499	"Via",
	500	sizeof(PerlIOVia),
	501	PERLIO_K_BUFFERED\|PERLIO_K_DESTRUCT,
	502	PerlIOVia_pushed,
	503	PerlIOVia_popped,
	504	NULL, /* PerlIOVia_open, */
	505	PerlIOVia_getarg,
	506	PerlIOVia_fileno,
	507	PerlIOVia_read,
	508	PerlIOVia_unread,
	509	PerlIOVia_write,
	510	PerlIOVia_seek,
	511	PerlIOVia_tell,
	512	PerlIOVia_close,
	513	PerlIOVia_flush,
	514	PerlIOVia_fill,
	515	PerlIOVia_eof,
	516	PerlIOVia_error,
	517	PerlIOVia_clearerr,
	518	PerlIOVia_setlinebuf,
	519	PerlIOVia_get_base,
	520	PerlIOVia_bufsiz,
	521	PerlIOVia_get_ptr,
	522	PerlIOVia_get_cnt,
	523	PerlIOVia_set_ptrcnt,
	524	};
	525
	526
	527	#endif /* Layers available */
	528
	529	MODULE = PerlIO::Via PACKAGE = PerlIO::Via
	530	PROTOTYPES: ENABLE;
	531
	532	BOOT:
	533	{
	534	#ifdef PERLIO_LAYERS
	535	PerlIO_define_layer(aTHX_ &PerlIO_object);
	536	#endif
	537	}
	538