[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;
   PUSHSTACKi(PERLSI_MAGIC);
   ENTER;
   SPAGAIN;
   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;
   POPSTACK;
  }
 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;
24f59afc	79	PUSHSTACKi(PERLSI_MAGIC);
e7a1fdd7	80	ENTER;
24f59afc	81	SPAGAIN;
e7a1fdd7	82	PUSHMARK(sp);
	83	XPUSHs(s->obj);
	84	while ((arg = va_arg(ap,SV *)))
	85	{
	86	XPUSHs(arg);
	87	}
	88	if (*PerlIONext(f))
	89	{
	90	if (!s->fh)
	91	{
	92	GV *gv = newGVgen(HvNAME(s->stash));
	93	GvIOp(gv) = newIO();
	94	s->fh = newRV_noinc((SV *)gv);
	95	s->io = GvIOp(gv);
	96	}
	97	IoIFP(s->io) = PerlIONext(f);
	98	IoOFP(s->io) = PerlIONext(f);
	99	XPUSHs(s->fh);
	100	}
d9dac8cd	101	else
	102	{
	103	PerlIO_debug("No next\n");
	104	}
e7a1fdd7	105	PUTBACK;
	106	count = call_sv((SV *)cv,flags);
	107	if (count)
	108	{
	109	SPAGAIN;
	110	result = POPs;
	111	PUTBACK;
	112	}
	113	else
	114	{
	115	result = &PL_sv_undef;
	116	}
	117	LEAVE;
24f59afc	118	POPSTACK;
e7a1fdd7	119	}
	120	va_end(ap);
	121	return result;
	122	}
	123
	124	IV
f62ce20a	125	PerlIOVia_pushed(pTHX_ PerlIO f, const char mode, SV *arg)
e7a1fdd7	126	{
f62ce20a	127	IV code = PerlIOBase_pushed(aTHX_ f,mode,Nullsv);
e7a1fdd7	128	if (code == 0)
e7a1fdd7	129	{
e7a1fdd7	130	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	131	if (!arg)
	132	{
99ef548b	133	if (ckWARN(WARN_LAYER))
99ef548b	134	Perl_warner(aTHX_ packWARN(WARN_LAYER), "No package specified");
d9dac8cd	135	errno = EINVAL;
e7a1fdd7	136	code = -1;
	137	}
	138	else
	139	{
	140	STRLEN pkglen = 0;
	141	char *pkg = SvPV(arg,pkglen);
267cbce7	142	s->obj = SvREFCNT_inc(arg);
e7a1fdd7	143	s->stash = gv_stashpvn(pkg, pkglen, FALSE);
	144	if (s->stash)
	145	{
	146	SV *modesv = (mode) ? sv_2mortal(newSVpvn(mode,strlen(mode))) : Nullsv;
	147	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(PUSHED),G_SCALAR,modesv,Nullsv);
	148	if (result)
	149	{
	150	if (sv_isobject(result))
267cbce7	151	{
	152	s->obj = SvREFCNT_inc(result);
	153	SvREFCNT_dec(arg);
	154	}
e7a1fdd7	155	else if (SvIV(result) != 0)
	156	return SvIV(result);
	157	}
	158	if (PerlIOVia_fetchmethod(aTHX_ s,MYMethod(FILL)) == (CV *) -1)
	159	PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
	160	else
	161	PerlIOBase(f)->flags \|= PERLIO_F_FASTGETS;
	162	}
	163	else
	164	{
99ef548b	165	if (ckWARN(WARN_LAYER))
99ef548b	166	Perl_warner(aTHX_ packWARN(WARN_LAYER), "Cannot find package '%.*s'",(int) pkglen,pkg);
267cbce7	167	#ifdef ENOSYS
	168	errno = ENOSYS;
	169	#else
	170	#ifdef ENOENT
	171	errno = ENOENT;
	172	#endif
	173	#endif
e7a1fdd7	174	code = -1;
	175	}
	176	}
	177	}
	178	return code;
	179	}
	180
	181	PerlIO *
d9dac8cd	182	PerlIOVia_open(pTHX_ PerlIO_funcs self, PerlIO_list_t layers, IV n,
	183	const char *mode, int fd, int imode, int perm,
	184	PerlIO f, int narg, SV *args)
e7a1fdd7	185	{
	186	if (!f)
	187	{
	188	f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX),self,mode,PerlIOArg);
	189	}
	190	else
	191	{
d9dac8cd	192	/* Reopen */
e7a1fdd7	193	if (!PerlIO_push(aTHX_ f,self,mode,PerlIOArg))
	194	return NULL;
	195	}
	196	if (f)
	197	{
	198	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	199	SV *result = Nullsv;
	200	if (fd >= 0)
	201	{
	202	SV *fdsv = sv_2mortal(newSViv(fd));
	203	result = PerlIOVia_method(aTHX_ f,MYMethod(FDOPEN),G_SCALAR,fdsv,Nullsv);
	204	}
	205	else if (narg > 0)
	206	{
	207	if (*mode == '#')
	208	{
	209	SV *imodesv = sv_2mortal(newSViv(imode));
	210	SV *permsv = sv_2mortal(newSViv(perm));
	211	result = PerlIOVia_method(aTHX_ f,MYMethod(SYSOPEN),G_SCALAR,*args,imodesv,permsv,Nullsv);
	212	}
	213	else
	214	{
	215	result = PerlIOVia_method(aTHX_ f,MYMethod(OPEN),G_SCALAR,*args,Nullsv);
	216	}
	217	}
	218	if (result)
	219	{
	220	if (sv_isobject(result))
	221	s->obj = SvREFCNT_inc(result);
	222	else if (!SvTRUE(result))
	223	{
	224	return NULL;
	225	}
	226	}
	227	else
d9dac8cd	228	{
	229	/* Required open method not present */
	230	PerlIO_funcs *tab = NULL;
	231	IV m = n-1;
	232	while (m >= 0) {
	233	PerlIO_funcs *t = PerlIO_layer_fetch(aTHX_ layers, m, NULL);
	234	if (t && t->Open) {
	235	tab = t;
	236	break;
	237	}
	238	n--;
	239	}
	240	if (tab) {
	241	if ((*tab->Open) (aTHX_ tab, layers, m, mode, fd, imode, perm,
	242	PerlIONext(f), narg, args)) {
	243	PerlIO_debug("Opened with %s => %p->%p\n",tab->name,PerlIONext(f),*PerlIONext(f));
	244	if (m + 1 < n) {
	245	/*
	246	* More layers above the one that we used to open -
	247	* apply them now
	248	*/
	249	if (PerlIO_apply_layera(aTHX_ PerlIONext(f), mode, layers, m+1, n) != 0) {
	250	/* If pushing layers fails close the file */
	251	PerlIO_close(f);
	252	f = NULL;
	253	}
	254	}
	255	return f;
	256	}
	257	else {
	258	/* Sub-layer open failed */
	259	}
	260	}
	261	else {
	262	/* Nothing to do the open */
	263	}
	264	return NULL;
	265	}
e7a1fdd7	266	}
	267	return f;
	268	}
	269
	270	IV
f62ce20a	271	PerlIOVia_popped(pTHX_ PerlIO *f)
e7a1fdd7	272	{
e7a1fdd7	273	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	274	PerlIOVia_method(aTHX_ f,MYMethod(POPPED),G_VOID,Nullsv);
	275	if (s->var)
	276	{
	277	SvREFCNT_dec(s->var);
	278	s->var = Nullsv;
	279	}
	280
	281	if (s->io)
	282	{
	283	IoIFP(s->io) = NULL;
	284	IoOFP(s->io) = NULL;
	285	}
	286	if (s->fh)
	287	{
	288	SvREFCNT_dec(s->fh);
	289	s->fh = Nullsv;
	290	s->io = NULL;
	291	}
	292	if (s->obj)
	293	{
	294	SvREFCNT_dec(s->obj);
	295	s->obj = Nullsv;
	296	}
	297	return 0;
	298	}
	299
	300	IV
f62ce20a	301	PerlIOVia_close(pTHX_ PerlIO *f)
e7a1fdd7	302	{
e7a1fdd7	303	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
f62ce20a	304	IV code = PerlIOBase_close(aTHX_ f);
e7a1fdd7	305	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(CLOSE),G_SCALAR,Nullsv);
	306	if (result && SvIV(result) != 0)
	307	code = SvIV(result);
	308	PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF\|PERLIO_F_WRBUF);
	309	return code;
	310	}
	311
	312	IV
f62ce20a	313	PerlIOVia_fileno(pTHX_ PerlIO *f)
e7a1fdd7	314	{
e7a1fdd7	315	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	316	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILENO),G_SCALAR,Nullsv);
	317	return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
	318	}
	319
	320	IV
f62ce20a	321	PerlIOVia_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
e7a1fdd7	322	{
e7a1fdd7	323	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	324	SV *offsv = sv_2mortal(newSViv(offset));
9f16d962	325	SV *whsv = sv_2mortal(newSViv(whence));
e7a1fdd7	326	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(SEEK),G_SCALAR,offsv,whsv,Nullsv);
	327	return (result) ? SvIV(result) : -1;
	328	}
	329
	330	Off_t
f62ce20a	331	PerlIOVia_tell(pTHX_ PerlIO *f)
e7a1fdd7	332	{
e7a1fdd7	333	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	334	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(TELL),G_SCALAR,Nullsv);
9f16d962	335	return (result) ? (Off_t) SvIV(result) : (Off_t) -1;
e7a1fdd7	336	}
	337
	338	SSize_t
f62ce20a	339	PerlIOVia_unread(pTHX_ PerlIO f, const void vbuf, Size_t count)
e7a1fdd7	340	{
e7a1fdd7	341	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	342	SV buf = sv_2mortal(newSVpvn((char )vbuf,count));
	343	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(UNREAD),G_SCALAR,buf,Nullsv);
	344	if (result)
	345	return (SSize_t) SvIV(result);
	346	else
	347	{
f62ce20a	348	return PerlIOBase_unread(aTHX_ f,vbuf,count);
e7a1fdd7	349	}
	350	}
	351
	352	SSize_t
f62ce20a	353	PerlIOVia_read(pTHX_ PerlIO f, void vbuf, Size_t count)
e7a1fdd7	354	{
	355	SSize_t rd = 0;
	356	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	357	{
	358	if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)
	359	{
f62ce20a	360	rd = PerlIOBase_read(aTHX_ f,vbuf,count);
e7a1fdd7	361	}
	362	else
	363	{
e7a1fdd7	364	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	365	SV *buf = sv_2mortal(newSV(count));
	366	SV *n = sv_2mortal(newSViv(count));
	367	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(READ),G_SCALAR,buf,n,Nullsv);
	368	if (result)
	369	{
	370	rd = (SSize_t) SvIV(result);
	371	Move(SvPVX(buf),vbuf,rd,char);
	372	return rd;
	373	}
	374	}
	375	}
	376	return rd;
	377	}
	378
	379	SSize_t
f62ce20a	380	PerlIOVia_write(pTHX_ PerlIO f, const void vbuf, Size_t count)
e7a1fdd7	381	{
	382	if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
	383	{
e7a1fdd7	384	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	385	SV buf = newSVpvn((char )vbuf,count);
	386	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(WRITE),G_SCALAR,buf,Nullsv);
	387	SvREFCNT_dec(buf);
	388	if (result)
	389	return (SSize_t) SvIV(result);
	390	return -1;
	391	}
	392	return 0;
	393	}
	394
	395	IV
f62ce20a	396	PerlIOVia_fill(pTHX_ PerlIO *f)
e7a1fdd7	397	{
	398	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	399	{
e7a1fdd7	400	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	401	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILL),G_SCALAR,Nullsv);
	402	if (s->var)
	403	{
	404	SvREFCNT_dec(s->var);
	405	s->var = Nullsv;
	406	}
	407	if (result && SvOK(result))
	408	{
	409	STRLEN len = 0;
	410	char *p = SvPV(result,len);
	411	s->var = newSVpvn(p,len);
	412	s->cnt = SvCUR(s->var);
	413	return 0;
	414	}
	415	else
	416	PerlIOBase(f)->flags \|= PERLIO_F_EOF;
	417	}
	418	return -1;
	419	}
	420
	421	IV
f62ce20a	422	PerlIOVia_flush(pTHX_ PerlIO *f)
e7a1fdd7	423	{
e7a1fdd7	424	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	425	SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FLUSH),G_SCALAR,Nullsv);
	426	if (s->var && s->cnt > 0)
	427	{
	428	SvREFCNT_dec(s->var);
	429	s->var = Nullsv;
	430	}
	431	return (result) ? SvIV(result) : 0;
	432	}
	433
	434	STDCHAR *
f62ce20a	435	PerlIOVia_get_base(pTHX_ PerlIO *f)
e7a1fdd7	436	{
	437	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	438	{
e7a1fdd7	439	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	440	if (s->var)
	441	{
	442	return (STDCHAR *)SvPVX(s->var);
	443	}
	444	}
	445	return (STDCHAR *) Nullch;
	446	}
	447
	448	STDCHAR *
f62ce20a	449	PerlIOVia_get_ptr(pTHX_ PerlIO *f)
e7a1fdd7	450	{
	451	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	452	{
	453	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	454	if (s->var)
	455	{
e7a1fdd7	456	STDCHAR p = (STDCHAR )(SvEND(s->var) - s->cnt);
	457	return p;
	458	}
	459	}
	460	return (STDCHAR *) Nullch;
	461	}
	462
	463	SSize_t
f62ce20a	464	PerlIOVia_get_cnt(pTHX_ PerlIO *f)
e7a1fdd7	465	{
	466	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	467	{
	468	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	469	if (s->var)
	470	{
	471	return s->cnt;
	472	}
	473	}
	474	return 0;
	475	}
	476
	477	Size_t
f62ce20a	478	PerlIOVia_bufsiz(pTHX_ PerlIO *f)
e7a1fdd7	479	{
	480	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
	481	{
	482	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	483	if (s->var)
	484	return SvCUR(s->var);
	485	}
	486	return 0;
	487	}
	488
	489	void
f62ce20a	490	PerlIOVia_set_ptrcnt(pTHX_ PerlIO f, STDCHAR ptr, SSize_t cnt)
e7a1fdd7	491	{
	492	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	493	s->cnt = cnt;
	494	}
	495
	496	void
f62ce20a	497	PerlIOVia_setlinebuf(pTHX_ PerlIO *f)
e7a1fdd7	498	{
e7a1fdd7	499	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	500	PerlIOVia_method(aTHX_ f,MYMethod(SETLINEBUF),G_VOID,Nullsv);
f62ce20a	501	PerlIOBase_setlinebuf(aTHX_ f);
e7a1fdd7	502	}
	503
	504	void
f62ce20a	505	PerlIOVia_clearerr(pTHX_ PerlIO *f)
e7a1fdd7	506	{
e7a1fdd7	507	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	508	PerlIOVia_method(aTHX_ f,MYMethod(CLEARERR),G_VOID,Nullsv);
f62ce20a	509	PerlIOBase_clearerr(aTHX_ f);
e7a1fdd7	510	}
e7a1fdd7	511
c7997937	512	IV
f62ce20a	513	PerlIOVia_error(pTHX_ PerlIO *f)
e7a1fdd7	514	{
e7a1fdd7	515	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
c7997937	516	SV *result = PerlIOVia_method(aTHX_ f,"ERROR",&s->mERROR,G_SCALAR,Nullsv);
f62ce20a	517	return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
e7a1fdd7	518	}
	519
	520	IV
f62ce20a	521	PerlIOVia_eof(pTHX_ PerlIO *f)
e7a1fdd7	522	{
e7a1fdd7	523	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
e7a1fdd7	524	SV *result = PerlIOVia_method(aTHX_ f,"EOF",&s->mEOF,G_SCALAR,Nullsv);
f62ce20a	525	return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
e7a1fdd7	526	}
e7a1fdd7	527
ecdeb87c	528	SV *
	529	PerlIOVia_getarg(pTHX_ PerlIO f, CLONE_PARAMS param, int flags)
	530	{
	531	PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
	532	return PerlIOVia_method(aTHX_ f,MYMethod(GETARG),G_SCALAR,Nullsv);
	533	}
	534
8cf8f3d1	535	PerlIO *
ecdeb87c	536	PerlIOVia_dup(pTHX_ PerlIO f, PerlIO o, CLONE_PARAMS *param, int flags)
8cf8f3d1	537	{
ecdeb87c	538	if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags)))
9f16d962	539	{
ecdeb87c	540	/* Most of the fields will lazily set themselves up as needed
9f16d962	541	stash and obj have been set up by the implied push
	542	*/
	543	}
	544	return f;
8cf8f3d1	545	}
8cf8f3d1	546
e7a1fdd7	547	PerlIO_funcs PerlIO_object = {
	548	"Via",
	549	sizeof(PerlIOVia),
	550	PERLIO_K_BUFFERED\|PERLIO_K_DESTRUCT,
	551	PerlIOVia_pushed,
	552	PerlIOVia_popped,
d9dac8cd	553	PerlIOVia_open, /* NULL, */
e7a1fdd7	554	PerlIOVia_getarg,
e7a1fdd7	555	PerlIOVia_fileno,
8cf8f3d1	556	PerlIOVia_dup,
e7a1fdd7	557	PerlIOVia_read,
	558	PerlIOVia_unread,
	559	PerlIOVia_write,
	560	PerlIOVia_seek,
	561	PerlIOVia_tell,
	562	PerlIOVia_close,
	563	PerlIOVia_flush,
	564	PerlIOVia_fill,
	565	PerlIOVia_eof,
	566	PerlIOVia_error,
	567	PerlIOVia_clearerr,
	568	PerlIOVia_setlinebuf,
	569	PerlIOVia_get_base,
	570	PerlIOVia_bufsiz,
	571	PerlIOVia_get_ptr,
	572	PerlIOVia_get_cnt,
	573	PerlIOVia_set_ptrcnt,
	574	};
	575
	576
	577	#endif /* Layers available */
	578
	579	MODULE = PerlIO::Via PACKAGE = PerlIO::Via
	580	PROTOTYPES: ENABLE;
	581
	582	BOOT:
	583	{
	584	#ifdef PERLIO_LAYERS
	585	PerlIO_define_layer(aTHX_ &PerlIO_object);
	586	#endif
	587	}
	588