[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;
 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;
  }
}

/*
 * Try and call method, possibly via cached lookup.
 * If method does not exist return Nullsv (caller may fallback to another approach
 * If method does exist call it with flags passing variable number of args
 * Last arg is a "filehandle" to layer below (if present)
 * Returns scalar returned by method (if any) otherwise sv_undef
 */

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);
    }
   else
    {
     PerlIO_debug("No next\n");
    }
   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");
     errno = EINVAL;
     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
  {
   /* Reopen */
   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
    {
	/* Required open method not present */
	PerlIO_funcs *tab = NULL;
	IV m = n-1;
	while (m >= 0) {
	    PerlIO_funcs *t = PerlIO_layer_fetch(aTHX_ layers, m, NULL);
	    if (t && t->Open) {
		tab = t;
		break;
	    }
	    n--;
	}
	if (tab) {
	    if ((*tab->Open) (aTHX_ tab, layers, m, mode, fd, imode, perm,
			      PerlIONext(f), narg, args)) {
		PerlIO_debug("Opened with %s => %p->%p\n",tab->name,PerlIONext(f),*PerlIONext(f));
		if (m + 1 < n) {
		    /*
		     * More layers above the one that we used to open -
		     * apply them now
		     */
		    if (PerlIO_apply_layera(aTHX_ PerlIONext(f), mode, layers, m+1, n) != 0) {
			/* If pushing layers fails close the file */
			PerlIO_close(f);
			f = NULL;
		    }
		}
		return f;
	    }
	    else {
		/* Sub-layer open failed */
	    }
	}
	else {
	    /* Nothing to do the open */
	}
     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,
 PerlIOVia_open, /* NULL, */
 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	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	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	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	56	}
e7a1fdd7	57
d9dac8cd	58	/*
	59	* Try and call method, possibly via cached lookup.
	60	* If method does not exist return Nullsv (caller may fallback to another approach
	61	* If method does exist call it with flags passing variable number of args
	62	* Last arg is a "filehandle" to layer below (if present)
	63	* Returns scalar returned by method (if any) otherwise sv_undef
	64	*/
	65
e7a1fdd7	66	SV *
	67	PerlIOVia_method(pTHX_ PerlIO f,char method,CV **save,int flags,...)
	68	{
	69	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	70	CV cv = (save) ? *save : PerlIOVia_fetchmethod(aTHX_ s,method,save);
	71	SV *result = Nullsv;
	72	va_list ap;
	73	va_start(ap,flags);
	74	if (cv != (CV *)-1)
	75	{
	76	IV count;
	77	dSP;
	78	SV *arg;
e7a1fdd7	79	ENTER;
	80	PUSHMARK(sp);
	81	XPUSHs(s->obj);
	82	while ((arg = va_arg(ap,SV *)))
	83	{
	84	XPUSHs(arg);
	85	}
	86	if (*PerlIONext(f))
	87	{
	88	if (!s->fh)
	89	{
	90	GV *gv = newGVgen(HvNAME(s->stash));
	91	GvIOp(gv) = newIO();
	92	s->fh = newRV_noinc((SV *)gv);
	93	s->io = GvIOp(gv);
	94	}
	95	IoIFP(s->io) = PerlIONext(f);
	96	IoOFP(s->io) = PerlIONext(f);
	97	XPUSHs(s->fh);
	98	}
d9dac8cd	99	else
	100	{
	101	PerlIO_debug("No next\n");
	102	}
e7a1fdd7	103	PUTBACK;
	104	count = call_sv((SV *)cv,flags);
	105	if (count)
	106	{
	107	SPAGAIN;
	108	result = POPs;
	109	PUTBACK;
	110	}
	111	else
	112	{
	113	result = &PL_sv_undef;
	114	}
	115	LEAVE;
	116	}
	117	va_end(ap);
	118	return result;
	119	}
	120
	121	IV
f62ce20a	122	PerlIOVia_pushed(pTHX_ PerlIO f, const char mode, SV *arg)
e7a1fdd7	123	{
f62ce20a	124	IV code = PerlIOBase_pushed(aTHX_ f,mode,Nullsv);
e7a1fdd7	125	if (code == 0)
e7a1fdd7	126	{
e7a1fdd7	127	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	128	if (!arg)
	129	{
99ef548b	130	if (ckWARN(WARN_LAYER))
99ef548b	131	Perl_warner(aTHX_ packWARN(WARN_LAYER), "No package specified");
d9dac8cd	132	errno = EINVAL;
e7a1fdd7	133	code = -1;
	134	}
	135	else
	136	{
	137	STRLEN pkglen = 0;
	138	char *pkg = SvPV(arg,pkglen);
267cbce7	139	s->obj = SvREFCNT_inc(arg);
e7a1fdd7	140	s->stash = gv_stashpvn(pkg, pkglen, FALSE);
	141	if (s->stash)
	142	{
	143	SV *modesv = (mode) ? sv_2mortal(newSVpvn(mode,strlen(mode))) : Nullsv;
	144	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(PUSHED),G_SCALAR,modesv,Nullsv);
	145	if (result)
	146	{
	147	if (sv_isobject(result))
267cbce7	148	{
	149	s->obj = SvREFCNT_inc(result);
	150	SvREFCNT_dec(arg);
	151	}
e7a1fdd7	152	else if (SvIV(result) != 0)
	153	return SvIV(result);
	154	}
	155	if (PerlIOVia_fetchmethod(aTHX_ s,MYMethod(FILL)) == (CV *) -1)
	156	PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
	157	else
	158	PerlIOBase(f)->flags \|= PERLIO_F_FASTGETS;
	159	}
	160	else
	161	{
99ef548b	162	if (ckWARN(WARN_LAYER))
99ef548b	163	Perl_warner(aTHX_ packWARN(WARN_LAYER), "Cannot find package '%.*s'",(int) pkglen,pkg);
267cbce7	164	#ifdef ENOSYS
	165	errno = ENOSYS;
	166	#else
	167	#ifdef ENOENT
	168	errno = ENOENT;
	169	#endif
	170	#endif
e7a1fdd7	171	code = -1;
	172	}
	173	}
	174	}
	175	return code;
	176	}
	177
	178	PerlIO *
d9dac8cd	179	PerlIOVia_open(pTHX_ PerlIO_funcs self, PerlIO_list_t layers, IV n,
	180	const char *mode, int fd, int imode, int perm,
	181	PerlIO f, int narg, SV *args)
e7a1fdd7	182	{
	183	if (!f)
	184	{
	185	f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX),self,mode,PerlIOArg);
	186	}
	187	else
	188	{
d9dac8cd	189	/* Reopen */
e7a1fdd7	190	if (!PerlIO_push(aTHX_ f,self,mode,PerlIOArg))
	191	return NULL;
	192	}
	193	if (f)
	194	{
	195	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	196	SV *result = Nullsv;
	197	if (fd >= 0)
	198	{
	199	SV *fdsv = sv_2mortal(newSViv(fd));
	200	result = PerlIOVia_method(aTHX_ f,MYMethod(FDOPEN),G_SCALAR,fdsv,Nullsv);
	201	}
	202	else if (narg > 0)
	203	{
	204	if (*mode == '#')
	205	{
	206	SV *imodesv = sv_2mortal(newSViv(imode));
	207	SV *permsv = sv_2mortal(newSViv(perm));
	208	result = PerlIOVia_method(aTHX_ f,MYMethod(SYSOPEN),G_SCALAR,*args,imodesv,permsv,Nullsv);
	209	}
	210	else
	211	{
	212	result = PerlIOVia_method(aTHX_ f,MYMethod(OPEN),G_SCALAR,*args,Nullsv);
	213	}
	214	}
	215	if (result)
	216	{
	217	if (sv_isobject(result))
	218	s->obj = SvREFCNT_inc(result);
	219	else if (!SvTRUE(result))
	220	{
	221	return NULL;
	222	}
	223	}
	224	else
d9dac8cd	225	{
	226	/* Required open method not present */
	227	PerlIO_funcs *tab = NULL;
	228	IV m = n-1;
	229	while (m >= 0) {
	230	PerlIO_funcs *t = PerlIO_layer_fetch(aTHX_ layers, m, NULL);
	231	if (t && t->Open) {
	232	tab = t;
	233	break;
	234	}
	235	n--;
	236	}
	237	if (tab) {
	238	if ((*tab->Open) (aTHX_ tab, layers, m, mode, fd, imode, perm,
	239	PerlIONext(f), narg, args)) {
	240	PerlIO_debug("Opened with %s => %p->%p\n",tab->name,PerlIONext(f),*PerlIONext(f));
	241	if (m + 1 < n) {
	242	/*
	243	* More layers above the one that we used to open -
	244	* apply them now
	245	*/
	246	if (PerlIO_apply_layera(aTHX_ PerlIONext(f), mode, layers, m+1, n) != 0) {
	247	/* If pushing layers fails close the file */
	248	PerlIO_close(f);
	249	f = NULL;
	250	}
	251	}
	252	return f;
	253	}
	254	else {
	255	/* Sub-layer open failed */
	256	}
	257	}
	258	else {
	259	/* Nothing to do the open */
	260	}
	261	return NULL;
	262	}
e7a1fdd7	263	}
	264	return f;
	265	}
	266
	267	IV
f62ce20a	268	PerlIOVia_popped(pTHX_ PerlIO *f)
e7a1fdd7	269	{
e7a1fdd7	270	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	271	PerlIOVia_method(aTHX_ f,MYMethod(POPPED),G_VOID,Nullsv);
	272	if (s->var)
	273	{
	274	SvREFCNT_dec(s->var);
	275	s->var = Nullsv;
	276	}
	277
	278	if (s->io)
	279	{
	280	IoIFP(s->io) = NULL;
	281	IoOFP(s->io) = NULL;
	282	}
	283	if (s->fh)
	284	{
	285	SvREFCNT_dec(s->fh);
	286	s->fh = Nullsv;
	287	s->io = NULL;
	288	}
	289	if (s->obj)
	290	{
	291	SvREFCNT_dec(s->obj);
	292	s->obj = Nullsv;
	293	}
	294	return 0;
	295	}
	296
	297	IV
f62ce20a	298	PerlIOVia_close(pTHX_ PerlIO *f)
e7a1fdd7	299	{
e7a1fdd7	300	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
f62ce20a	301	IV code = PerlIOBase_close(aTHX_ f);
e7a1fdd7	302	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(CLOSE),G_SCALAR,Nullsv);
	303	if (result && SvIV(result) != 0)
	304	code = SvIV(result);
	305	PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF\|PERLIO_F_WRBUF);
	306	return code;
	307	}
	308
	309	IV
f62ce20a	310	PerlIOVia_fileno(pTHX_ PerlIO *f)
e7a1fdd7	311	{
e7a1fdd7	312	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	313	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILENO),G_SCALAR,Nullsv);
	314	return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
	315	}
	316
	317	IV
f62ce20a	318	PerlIOVia_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
e7a1fdd7	319	{
e7a1fdd7	320	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	321	SV *offsv = sv_2mortal(newSViv(offset));
9f16d962	322	SV *whsv = sv_2mortal(newSViv(whence));
e7a1fdd7	323	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(SEEK),G_SCALAR,offsv,whsv,Nullsv);
	324	return (result) ? SvIV(result) : -1;
	325	}
	326
	327	Off_t
f62ce20a	328	PerlIOVia_tell(pTHX_ PerlIO *f)
e7a1fdd7	329	{
e7a1fdd7	330	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	331	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(TELL),G_SCALAR,Nullsv);
9f16d962	332	return (result) ? (Off_t) SvIV(result) : (Off_t) -1;
e7a1fdd7	333	}
	334
	335	SSize_t
f62ce20a	336	PerlIOVia_unread(pTHX_ PerlIO f, const void vbuf, Size_t count)
e7a1fdd7	337	{
e7a1fdd7	338	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	339	SV buf = sv_2mortal(newSVpvn((char )vbuf,count));
	340	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(UNREAD),G_SCALAR,buf,Nullsv);
	341	if (result)
	342	return (SSize_t) SvIV(result);
	343	else
	344	{
f62ce20a	345	return PerlIOBase_unread(aTHX_ f,vbuf,count);
e7a1fdd7	346	}
	347	}
	348
	349	SSize_t
f62ce20a	350	PerlIOVia_read(pTHX_ PerlIO f, void vbuf, Size_t count)
e7a1fdd7	351	{
	352	SSize_t rd = 0;
	353	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	354	{
	355	if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)
	356	{
f62ce20a	357	rd = PerlIOBase_read(aTHX_ f,vbuf,count);
e7a1fdd7	358	}
	359	else
	360	{
e7a1fdd7	361	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	362	SV *buf = sv_2mortal(newSV(count));
	363	SV *n = sv_2mortal(newSViv(count));
	364	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(READ),G_SCALAR,buf,n,Nullsv);
	365	if (result)
	366	{
	367	rd = (SSize_t) SvIV(result);
	368	Move(SvPVX(buf),vbuf,rd,char);
	369	return rd;
	370	}
	371	}
	372	}
	373	return rd;
	374	}
	375
	376	SSize_t
f62ce20a	377	PerlIOVia_write(pTHX_ PerlIO f, const void vbuf, Size_t count)
e7a1fdd7	378	{
	379	if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
	380	{
e7a1fdd7	381	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	382	SV buf = newSVpvn((char )vbuf,count);
	383	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(WRITE),G_SCALAR,buf,Nullsv);
	384	SvREFCNT_dec(buf);
	385	if (result)
	386	return (SSize_t) SvIV(result);
	387	return -1;
	388	}
	389	return 0;
	390	}
	391
	392	IV
f62ce20a	393	PerlIOVia_fill(pTHX_ PerlIO *f)
e7a1fdd7	394	{
	395	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	396	{
e7a1fdd7	397	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	398	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILL),G_SCALAR,Nullsv);
	399	if (s->var)
	400	{
	401	SvREFCNT_dec(s->var);
	402	s->var = Nullsv;
	403	}
	404	if (result && SvOK(result))
	405	{
	406	STRLEN len = 0;
	407	char *p = SvPV(result,len);
	408	s->var = newSVpvn(p,len);
	409	s->cnt = SvCUR(s->var);
	410	return 0;
	411	}
	412	else
	413	PerlIOBase(f)->flags \|= PERLIO_F_EOF;
	414	}
	415	return -1;
	416	}
	417
	418	IV
f62ce20a	419	PerlIOVia_flush(pTHX_ PerlIO *f)
e7a1fdd7	420	{
e7a1fdd7	421	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	422	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FLUSH),G_SCALAR,Nullsv);
	423	if (s->var && s->cnt > 0)
	424	{
	425	SvREFCNT_dec(s->var);
	426	s->var = Nullsv;
	427	}
	428	return (result) ? SvIV(result) : 0;
	429	}
	430
	431	STDCHAR *
f62ce20a	432	PerlIOVia_get_base(pTHX_ PerlIO *f)
e7a1fdd7	433	{
	434	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	435	{
e7a1fdd7	436	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	437	if (s->var)
	438	{
	439	return (STDCHAR *)SvPVX(s->var);
	440	}
	441	}
	442	return (STDCHAR *) Nullch;
	443	}
	444
	445	STDCHAR *
f62ce20a	446	PerlIOVia_get_ptr(pTHX_ PerlIO *f)
e7a1fdd7	447	{
	448	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	449	{
	450	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	451	if (s->var)
	452	{
e7a1fdd7	453	STDCHAR p = (STDCHAR )(SvEND(s->var) - s->cnt);
	454	return p;
	455	}
	456	}
	457	return (STDCHAR *) Nullch;
	458	}
	459
	460	SSize_t
f62ce20a	461	PerlIOVia_get_cnt(pTHX_ PerlIO *f)
e7a1fdd7	462	{
	463	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	464	{
	465	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	466	if (s->var)
	467	{
	468	return s->cnt;
	469	}
	470	}
	471	return 0;
	472	}
	473
	474	Size_t
f62ce20a	475	PerlIOVia_bufsiz(pTHX_ PerlIO *f)
e7a1fdd7	476	{
	477	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	478	{
	479	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	480	if (s->var)
	481	return SvCUR(s->var);
	482	}
	483	return 0;
	484	}
	485
	486	void
f62ce20a	487	PerlIOVia_set_ptrcnt(pTHX_ PerlIO f, STDCHAR ptr, SSize_t cnt)
e7a1fdd7	488	{
	489	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	490	s->cnt = cnt;
	491	}
	492
	493	void
f62ce20a	494	PerlIOVia_setlinebuf(pTHX_ PerlIO *f)
e7a1fdd7	495	{
e7a1fdd7	496	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	497	PerlIOVia_method(aTHX_ f,MYMethod(SETLINEBUF),G_VOID,Nullsv);
f62ce20a	498	PerlIOBase_setlinebuf(aTHX_ f);
e7a1fdd7	499	}
	500
	501	void
f62ce20a	502	PerlIOVia_clearerr(pTHX_ PerlIO *f)
e7a1fdd7	503	{
e7a1fdd7	504	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	505	PerlIOVia_method(aTHX_ f,MYMethod(CLEARERR),G_VOID,Nullsv);
f62ce20a	506	PerlIOBase_clearerr(aTHX_ f);
e7a1fdd7	507	}
e7a1fdd7	508
c7997937	509	IV
f62ce20a	510	PerlIOVia_error(pTHX_ PerlIO *f)
e7a1fdd7	511	{
e7a1fdd7	512	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
c7997937	513	SV *result = PerlIOVia_method(aTHX_ f,"ERROR",&s->mERROR,G_SCALAR,Nullsv);
f62ce20a	514	return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
e7a1fdd7	515	}
	516
	517	IV
f62ce20a	518	PerlIOVia_eof(pTHX_ PerlIO *f)
e7a1fdd7	519	{
e7a1fdd7	520	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	521	SV *result = PerlIOVia_method(aTHX_ f,"EOF",&s->mEOF,G_SCALAR,Nullsv);
f62ce20a	522	return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
e7a1fdd7	523	}
e7a1fdd7	524
ecdeb87c	525	SV *
	526	PerlIOVia_getarg(pTHX_ PerlIO f, CLONE_PARAMS param, int flags)
	527	{
	528	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	529	return PerlIOVia_method(aTHX_ f,MYMethod(GETARG),G_SCALAR,Nullsv);
	530	}
	531
8cf8f3d1	532	PerlIO *
ecdeb87c	533	PerlIOVia_dup(pTHX_ PerlIO f, PerlIO o, CLONE_PARAMS *param, int flags)
8cf8f3d1	534	{
ecdeb87c	535	if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags)))
9f16d962	536	{
ecdeb87c	537	/* Most of the fields will lazily set themselves up as needed
9f16d962	538	stash and obj have been set up by the implied push
	539	*/
	540	}
	541	return f;
8cf8f3d1	542	}
8cf8f3d1	543
e7a1fdd7	544	PerlIO_funcs PerlIO_object = {
	545	"Via",
	546	sizeof(PerlIOVia),
	547	PERLIO_K_BUFFERED\|PERLIO_K_DESTRUCT,
	548	PerlIOVia_pushed,
	549	PerlIOVia_popped,
d9dac8cd	550	PerlIOVia_open, /* NULL, */
e7a1fdd7	551	PerlIOVia_getarg,
e7a1fdd7	552	PerlIOVia_fileno,
8cf8f3d1	553	PerlIOVia_dup,
e7a1fdd7	554	PerlIOVia_read,
	555	PerlIOVia_unread,
	556	PerlIOVia_write,
	557	PerlIOVia_seek,
	558	PerlIOVia_tell,
	559	PerlIOVia_close,
	560	PerlIOVia_flush,
	561	PerlIOVia_fill,
	562	PerlIOVia_eof,
	563	PerlIOVia_error,
	564	PerlIOVia_clearerr,
	565	PerlIOVia_setlinebuf,
	566	PerlIOVia_get_base,
	567	PerlIOVia_bufsiz,
	568	PerlIOVia_get_ptr,
	569	PerlIOVia_get_cnt,
	570	PerlIOVia_set_ptrcnt,
	571	};
	572
	573
	574	#endif /* Layers available */
	575
	576	MODULE = PerlIO::Via PACKAGE = PerlIO::Via
	577	PROTOTYPES: ENABLE;
	578
	579	BOOT:
	580	{
	581	#ifdef PERLIO_LAYERS
	582	PerlIO_define_layer(aTHX_ &PerlIO_object);
	583	#endif
	584	}
	585