[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;
 CV *BINMODE;
} 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");
	    /* FIXME: How should this work for OPEN etc? */
	}
	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,
		 PerlIO_funcs * tab)
{
    IV code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab);
    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) {
		s->obj =
		    newSVpvn(Perl_form(aTHX_ "PerlIO::via::%s", pkg),
			     pkglen + 13);
		SvREFCNT_dec(arg);
		s->stash = gv_stashpvn(SvPVX(s->obj), pkglen + 13, FALSE);
	    }
	    if (s->stash) {
		char lmode[8];
		SV *modesv;
		SV *result;
		if (!mode) {
		    /* binmode() passes NULL - so find out what mode is */
		    mode = PerlIO_modestr(f,lmode);
		}
		modesv = sv_2mortal(newSVpvn(mode, strlen(mode)));
		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;
			}
		    }
		    /* FIXME - Call an OPENED method here ? */
		    return f;
		}
		else {
		    PerlIO_debug("Open fail %s => %p->%p\n", tab->name,
				 PerlIONext(f), *PerlIONext(f));
		    /* Sub-layer open failed */
		}
	    }
	    else {
	         PerlIO_debug("Nothing to open with");
		/* Nothing to do the open */
	    }
	    PerlIO_pop(aTHX_ f);
	    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_binmode(pTHX_ PerlIO * f)
{
    PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
    SV *result =
	PerlIOVia_method(aTHX_ f, MYMethod(BINMODE), G_SCALAR, Nullsv);
    if (!result || !SvOK(result)) {
	PerlIO_pop(aTHX_ f);
	return 0;
    }
    return SvIV(result);
}

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 = {
 sizeof(PerlIO_funcs),
 "via",
 sizeof(PerlIOVia),
 PERLIO_K_BUFFERED|PERLIO_K_DESTRUCT,
 PerlIOVia_pushed,
 PerlIOVia_popped,
 PerlIOVia_open, /* NULL, */
 PerlIOVia_binmode, /* 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;
86e05cf2	37	CV *BINMODE;
e7a1fdd7	38	} PerlIOVia;
	39
	40	#define MYMethod(x) #x,&s->x
	41
	42	CV *
fc040538	43	PerlIOVia_fetchmethod(pTHX_ PerlIOVia * s, char method, CV * save)
e7a1fdd7	44	{
fc040538	45	GV *gv = gv_fetchmeth(s->stash, method, strlen(method), 0);
e7a1fdd7	46	#if 0
fc040538	47	Perl_warn(aTHX_ "Lookup %s::%s => %p", HvNAME(s->stash), method, gv);
e7a1fdd7	48	#endif
fc040538	49	if (gv) {
	50	return *save = GvCV(gv);
	51	}
	52	else {
	53	return save = (CV ) - 1;
	54	}
e7a1fdd7	55	}
e7a1fdd7	56
d9dac8cd	57	/*
	58	* Try and call method, possibly via cached lookup.
	59	* If method does not exist return Nullsv (caller may fallback to another approach
	60	* If method does exist call it with flags passing variable number of args
	61	* Last arg is a "filehandle" to layer below (if present)
	62	* Returns scalar returned by method (if any) otherwise sv_undef
	63	*/
	64
e7a1fdd7	65	SV *
fc040538	66	PerlIOVia_method(pTHX_ PerlIO * f, char method, CV * save, int flags,
fc040538	67	...)
e7a1fdd7	68	{
fc040538	69	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	70	CV *cv =
	71	(save) ? save : PerlIOVia_fetchmethod(aTHX_ s, method, save);
	72	SV *result = Nullsv;
	73	va_list ap;
	74	va_start(ap, flags);
	75	if (cv != (CV *) - 1) {
	76	IV count;
	77	dSP;
	78	SV *arg;
	79	PUSHSTACKi(PERLSI_MAGIC);
	80	ENTER;
	81	SPAGAIN;
	82	PUSHMARK(sp);
	83	XPUSHs(s->obj);
	84	while ((arg = va_arg(ap, SV *))) {
	85	XPUSHs(arg);
	86	}
	87	if (*PerlIONext(f)) {
	88	if (!s->fh) {
	89	GV *gv = newGVgen(HvNAME(s->stash));
	90	GvIOp(gv) = newIO();
	91	s->fh = newRV_noinc((SV *) gv);
	92	s->io = GvIOp(gv);
	93	}
	94	IoIFP(s->io) = PerlIONext(f);
	95	IoOFP(s->io) = PerlIONext(f);
	96	XPUSHs(s->fh);
	97	}
	98	else {
	99	PerlIO_debug("No next\n");
30ef3321	100	/* FIXME: How should this work for OPEN etc? */
fc040538	101	}
	102	PUTBACK;
	103	count = call_sv((SV *) cv, flags);
	104	if (count) {
	105	SPAGAIN;
	106	result = POPs;
	107	PUTBACK;
	108	}
	109	else {
	110	result = &PL_sv_undef;
	111	}
	112	LEAVE;
	113	POPSTACK;
e7a1fdd7	114	}
fc040538	115	va_end(ap);
fc040538	116	return result;
e7a1fdd7	117	}
	118
	119	IV
fc040538	120	PerlIOVia_pushed(pTHX_ PerlIO * f, const char mode, SV arg,
fc040538	121	PerlIO_funcs * tab)
e7a1fdd7	122	{
fc040538	123	IV code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab);
	124	if (code == 0) {
	125	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	126	if (!arg) {
	127	if (ckWARN(WARN_LAYER))
	128	Perl_warner(aTHX_ packWARN(WARN_LAYER),
	129	"No package specified");
	130	errno = EINVAL;
	131	code = -1;
	132	}
	133	else {
	134	STRLEN pkglen = 0;
	135	char *pkg = SvPV(arg, pkglen);
	136	s->obj = SvREFCNT_inc(arg);
	137	s->stash = gv_stashpvn(pkg, pkglen, FALSE);
	138	if (!s->stash) {
	139	s->obj =
e934609f	140	newSVpvn(Perl_form(aTHX_ "PerlIO::via::%s", pkg),
fc040538	141	pkglen + 13);
	142	SvREFCNT_dec(arg);
	143	s->stash = gv_stashpvn(SvPVX(s->obj), pkglen + 13, FALSE);
	144	}
	145	if (s->stash) {
abc0a015	146	char lmode[8];
	147	SV *modesv;
	148	SV *result;
	149	if (!mode) {
	150	/* binmode() passes NULL - so find out what mode is */
	151	mode = PerlIO_modestr(f,lmode);
	152	}
	153	modesv = sv_2mortal(newSVpvn(mode, strlen(mode)));
	154	result = PerlIOVia_method(aTHX_ f, MYMethod(PUSHED), G_SCALAR,
fc040538	155	modesv, Nullsv);
	156	if (result) {
	157	if (sv_isobject(result)) {
	158	s->obj = SvREFCNT_inc(result);
	159	SvREFCNT_dec(arg);
	160	}
	161	else if (SvIV(result) != 0)
	162	return SvIV(result);
	163	}
	164	if (PerlIOVia_fetchmethod(aTHX_ s, MYMethod(FILL)) ==
	165	(CV *) - 1)
	166	PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
	167	else
	168	PerlIOBase(f)->flags \|= PERLIO_F_FASTGETS;
	169	}
	170	else {
	171	if (ckWARN(WARN_LAYER))
	172	Perl_warner(aTHX_ packWARN(WARN_LAYER),
	173	"Cannot find package '%.*s'", (int) pkglen,
	174	pkg);
267cbce7	175	#ifdef ENOSYS
fc040538	176	errno = ENOSYS;
267cbce7	177	#else
267cbce7	178	#ifdef ENOENT
fc040538	179	errno = ENOENT;
267cbce7	180	#endif
267cbce7	181	#endif
fc040538	182	code = -1;
	183	}
	184	}
e7a1fdd7	185	}
fc040538	186	return code;
e7a1fdd7	187	}
	188
	189	PerlIO *
fc040538	190	PerlIOVia_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers,
	191	IV n, const char *mode, int fd, int imode, int perm,
	192	PerlIO * f, int narg, SV ** args)
e7a1fdd7	193	{
fc040538	194	if (!f) {
	195	f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX), self, mode,
	196	PerlIOArg);
e7a1fdd7	197	}
fc040538	198	else {
	199	/* Reopen */
	200	if (!PerlIO_push(aTHX_ f, self, mode, PerlIOArg))
	201	return NULL;
e7a1fdd7	202	}
fc040538	203	if (f) {
	204	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	205	SV *result = Nullsv;
	206	if (fd >= 0) {
	207	SV *fdsv = sv_2mortal(newSViv(fd));
	208	result =
	209	PerlIOVia_method(aTHX_ f, MYMethod(FDOPEN), G_SCALAR, fdsv,
	210	Nullsv);
	211	}
	212	else if (narg > 0) {
	213	if (*mode == '#') {
	214	SV *imodesv = sv_2mortal(newSViv(imode));
	215	SV *permsv = sv_2mortal(newSViv(perm));
	216	result =
	217	PerlIOVia_method(aTHX_ f, MYMethod(SYSOPEN), G_SCALAR,
	218	*args, imodesv, permsv, Nullsv);
	219	}
	220	else {
	221	result =
	222	PerlIOVia_method(aTHX_ f, MYMethod(OPEN), G_SCALAR,
	223	*args, Nullsv);
d9dac8cd	224	}
d9dac8cd	225	}
fc040538	226	if (result) {
	227	if (sv_isobject(result))
	228	s->obj = SvREFCNT_inc(result);
	229	else if (!SvTRUE(result)) {
	230	return NULL;
	231	}
	232	}
	233	else {
	234	/* Required open method not present */
	235	PerlIO_funcs *tab = NULL;
	236	IV m = n - 1;
	237	while (m >= 0) {
	238	PerlIO_funcs *t =
	239	PerlIO_layer_fetch(aTHX_ layers, m, NULL);
	240	if (t && t->Open) {
	241	tab = t;
	242	break;
	243	}
	244	n--;
	245	}
	246	if (tab) {
	247	if ((*tab->Open) (aTHX_ tab, layers, m, mode, fd, imode,
	248	perm, PerlIONext(f), narg, args)) {
	249	PerlIO_debug("Opened with %s => %p->%p\n", tab->name,
	250	PerlIONext(f), *PerlIONext(f));
	251	if (m + 1 < n) {
	252	/*
	253	* More layers above the one that we used to open -
	254	* apply them now
	255	*/
	256	if (PerlIO_apply_layera
	257	(aTHX_ PerlIONext(f), mode, layers, m + 1,
	258	n) != 0) {
	259	/* If pushing layers fails close the file */
	260	PerlIO_close(f);
	261	f = NULL;
	262	}
d9dac8cd	263	}
30ef3321	264	/* FIXME - Call an OPENED method here ? */
fc040538	265	return f;
	266	}
	267	else {
30ef3321	268	PerlIO_debug("Open fail %s => %p->%p\n", tab->name,
30ef3321	269	PerlIONext(f), *PerlIONext(f));
fc040538	270	/* Sub-layer open failed */
d9dac8cd	271	}
d9dac8cd	272	}
d9dac8cd	273	else {
30ef3321	274	PerlIO_debug("Nothing to open with");
fc040538	275	/* Nothing to do the open */
d9dac8cd	276	}
30ef3321	277	PerlIO_pop(aTHX_ f);
fc040538	278	return NULL;
d9dac8cd	279	}
d9dac8cd	280	}
fc040538	281	return f;
e7a1fdd7	282	}
	283
	284	IV
fc040538	285	PerlIOVia_popped(pTHX_ PerlIO * f)
e7a1fdd7	286	{
fc040538	287	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	288	PerlIOVia_method(aTHX_ f, MYMethod(POPPED), G_VOID, Nullsv);
	289	if (s->var) {
	290	SvREFCNT_dec(s->var);
	291	s->var = Nullsv;
	292	}
	293
	294	if (s->io) {
	295	IoIFP(s->io) = NULL;
	296	IoOFP(s->io) = NULL;
	297	}
	298	if (s->fh) {
	299	SvREFCNT_dec(s->fh);
	300	s->fh = Nullsv;
	301	s->io = NULL;
	302	}
	303	if (s->obj) {
	304	SvREFCNT_dec(s->obj);
	305	s->obj = Nullsv;
	306	}
	307	return 0;
e7a1fdd7	308	}
	309
	310	IV
fc040538	311	PerlIOVia_close(pTHX_ PerlIO * f)
e7a1fdd7	312	{
fc040538	313	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	314	IV code = PerlIOBase_close(aTHX_ f);
	315	SV *result =
	316	PerlIOVia_method(aTHX_ f, MYMethod(CLOSE), G_SCALAR, Nullsv);
	317	if (result && SvIV(result) != 0)
	318	code = SvIV(result);
	319	PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF \| PERLIO_F_WRBUF);
	320	return code;
e7a1fdd7	321	}
	322
	323	IV
fc040538	324	PerlIOVia_fileno(pTHX_ PerlIO * f)
e7a1fdd7	325	{
fc040538	326	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	327	SV *result =
	328	PerlIOVia_method(aTHX_ f, MYMethod(FILENO), G_SCALAR, Nullsv);
	329	return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
e7a1fdd7	330	}
	331
	332	IV
fc040538	333	PerlIOVia_binmode(pTHX_ PerlIO * f)
86e05cf2	334	{
fc040538	335	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	336	SV *result =
	337	PerlIOVia_method(aTHX_ f, MYMethod(BINMODE), G_SCALAR, Nullsv);
	338	if (!result \|\| !SvOK(result)) {
	339	PerlIO_pop(aTHX_ f);
	340	return 0;
	341	}
	342	return SvIV(result);
86e05cf2	343	}
	344
	345	IV
fc040538	346	PerlIOVia_seek(pTHX_ PerlIO * f, Off_t offset, int whence)
e7a1fdd7	347	{
fc040538	348	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	349	SV *offsv = sv_2mortal(newSViv(offset));
	350	SV *whsv = sv_2mortal(newSViv(whence));
	351	SV *result =
	352	PerlIOVia_method(aTHX_ f, MYMethod(SEEK), G_SCALAR, offsv, whsv,
	353	Nullsv);
	354	return (result) ? SvIV(result) : -1;
e7a1fdd7	355	}
	356
	357	Off_t
fc040538	358	PerlIOVia_tell(pTHX_ PerlIO * f)
e7a1fdd7	359	{
fc040538	360	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	361	SV *result =
	362	PerlIOVia_method(aTHX_ f, MYMethod(TELL), G_SCALAR, Nullsv);
	363	return (result) ? (Off_t) SvIV(result) : (Off_t) - 1;
e7a1fdd7	364	}
	365
	366	SSize_t
fc040538	367	PerlIOVia_unread(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
e7a1fdd7	368	{
fc040538	369	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	370	SV buf = sv_2mortal(newSVpvn((char ) vbuf, count));
	371	SV *result =
	372	PerlIOVia_method(aTHX_ f, MYMethod(UNREAD), G_SCALAR, buf, Nullsv);
	373	if (result)
	374	return (SSize_t) SvIV(result);
	375	else {
	376	return PerlIOBase_unread(aTHX_ f, vbuf, count);
	377	}
e7a1fdd7	378	}
	379
	380	SSize_t
fc040538	381	PerlIOVia_read(pTHX_ PerlIO * f, void *vbuf, Size_t count)
e7a1fdd7	382	{
fc040538	383	SSize_t rd = 0;
	384	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	385	if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS) {
	386	rd = PerlIOBase_read(aTHX_ f, vbuf, count);
	387	}
	388	else {
	389	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	390	SV *buf = sv_2mortal(newSV(count));
	391	SV *n = sv_2mortal(newSViv(count));
	392	SV *result =
	393	PerlIOVia_method(aTHX_ f, MYMethod(READ), G_SCALAR, buf, n,
	394	Nullsv);
	395	if (result) {
	396	rd = (SSize_t) SvIV(result);
	397	Move(SvPVX(buf), vbuf, rd, char);
	398	return rd;
	399	}
	400	}
e7a1fdd7	401	}
fc040538	402	return rd;
e7a1fdd7	403	}
	404
	405	SSize_t
fc040538	406	PerlIOVia_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
e7a1fdd7	407	{
fc040538	408	if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
	409	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	410	SV buf = newSVpvn((char ) vbuf, count);
	411	SV *result =
	412	PerlIOVia_method(aTHX_ f, MYMethod(WRITE), G_SCALAR, buf,
	413	Nullsv);
	414	SvREFCNT_dec(buf);
	415	if (result)
	416	return (SSize_t) SvIV(result);
	417	return -1;
	418	}
	419	return 0;
e7a1fdd7	420	}
	421
	422	IV
fc040538	423	PerlIOVia_fill(pTHX_ PerlIO * f)
e7a1fdd7	424	{
fc040538	425	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	426	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	427	SV *result =
	428	PerlIOVia_method(aTHX_ f, MYMethod(FILL), G_SCALAR, Nullsv);
	429	if (s->var) {
	430	SvREFCNT_dec(s->var);
	431	s->var = Nullsv;
	432	}
	433	if (result && SvOK(result)) {
	434	STRLEN len = 0;
	435	char *p = SvPV(result, len);
	436	s->var = newSVpvn(p, len);
	437	s->cnt = SvCUR(s->var);
	438	return 0;
	439	}
	440	else
	441	PerlIOBase(f)->flags \|= PERLIO_F_EOF;
e7a1fdd7	442	}
fc040538	443	return -1;
e7a1fdd7	444	}
	445
	446	IV
fc040538	447	PerlIOVia_flush(pTHX_ PerlIO * f)
e7a1fdd7	448	{
fc040538	449	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	450	SV *result =
	451	PerlIOVia_method(aTHX_ f, MYMethod(FLUSH), G_SCALAR, Nullsv);
	452	if (s->var && s->cnt > 0) {
	453	SvREFCNT_dec(s->var);
	454	s->var = Nullsv;
	455	}
	456	return (result) ? SvIV(result) : 0;
e7a1fdd7	457	}
	458
	459	STDCHAR *
fc040538	460	PerlIOVia_get_base(pTHX_ PerlIO * f)
e7a1fdd7	461	{
fc040538	462	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	463	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	464	if (s->var) {
	465	return (STDCHAR *) SvPVX(s->var);
	466	}
e7a1fdd7	467	}
fc040538	468	return (STDCHAR *) Nullch;
e7a1fdd7	469	}
	470
	471	STDCHAR *
fc040538	472	PerlIOVia_get_ptr(pTHX_ PerlIO * f)
e7a1fdd7	473	{
fc040538	474	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	475	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	476	if (s->var) {
	477	STDCHAR p = (STDCHAR ) (SvEND(s->var) - s->cnt);
	478	return p;
	479	}
e7a1fdd7	480	}
fc040538	481	return (STDCHAR *) Nullch;
e7a1fdd7	482	}
	483
	484	SSize_t
fc040538	485	PerlIOVia_get_cnt(pTHX_ PerlIO * f)
e7a1fdd7	486	{
fc040538	487	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	488	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	489	if (s->var) {
	490	return s->cnt;
	491	}
e7a1fdd7	492	}
fc040538	493	return 0;
e7a1fdd7	494	}
	495
	496	Size_t
fc040538	497	PerlIOVia_bufsiz(pTHX_ PerlIO * f)
e7a1fdd7	498	{
fc040538	499	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	500	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	501	if (s->var)
	502	return SvCUR(s->var);
	503	}
	504	return 0;
e7a1fdd7	505	}
	506
	507	void
fc040538	508	PerlIOVia_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
e7a1fdd7	509	{
fc040538	510	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
fc040538	511	s->cnt = cnt;
e7a1fdd7	512	}
	513
	514	void
fc040538	515	PerlIOVia_setlinebuf(pTHX_ PerlIO * f)
e7a1fdd7	516	{
fc040538	517	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	518	PerlIOVia_method(aTHX_ f, MYMethod(SETLINEBUF), G_VOID, Nullsv);
	519	PerlIOBase_setlinebuf(aTHX_ f);
e7a1fdd7	520	}
	521
	522	void
fc040538	523	PerlIOVia_clearerr(pTHX_ PerlIO * f)
e7a1fdd7	524	{
fc040538	525	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	526	PerlIOVia_method(aTHX_ f, MYMethod(CLEARERR), G_VOID, Nullsv);
	527	PerlIOBase_clearerr(aTHX_ f);
e7a1fdd7	528	}
e7a1fdd7	529
c7997937	530	IV
fc040538	531	PerlIOVia_error(pTHX_ PerlIO * f)
e7a1fdd7	532	{
fc040538	533	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	534	SV *result =
	535	PerlIOVia_method(aTHX_ f, "ERROR", &s->mERROR, G_SCALAR, Nullsv);
	536	return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
e7a1fdd7	537	}
	538
	539	IV
fc040538	540	PerlIOVia_eof(pTHX_ PerlIO * f)
e7a1fdd7	541	{
fc040538	542	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
	543	SV *result =
	544	PerlIOVia_method(aTHX_ f, "EOF", &s->mEOF, G_SCALAR, Nullsv);
	545	return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
e7a1fdd7	546	}
e7a1fdd7	547
ecdeb87c	548	SV *
fc040538	549	PerlIOVia_getarg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags)
ecdeb87c	550	{
fc040538	551	PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
fc040538	552	return PerlIOVia_method(aTHX_ f, MYMethod(GETARG), G_SCALAR, Nullsv);
ecdeb87c	553	}
ecdeb87c	554
8cf8f3d1	555	PerlIO *
fc040538	556	PerlIOVia_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param,
fc040538	557	int flags)
8cf8f3d1	558	{
fc040538	559	if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
	560	/* Most of the fields will lazily set themselves up as needed
	561	stash and obj have been set up by the implied push
	562	*/
	563	}
	564	return f;
8cf8f3d1	565	}
8cf8f3d1	566
fc040538	567
fc040538	568
e7a1fdd7	569	PerlIO_funcs PerlIO_object = {
2dc2558e	570	sizeof(PerlIO_funcs),
e934609f	571	"via",
e7a1fdd7	572	sizeof(PerlIOVia),
	573	PERLIO_K_BUFFERED\|PERLIO_K_DESTRUCT,
	574	PerlIOVia_pushed,
	575	PerlIOVia_popped,
d9dac8cd	576	PerlIOVia_open, /* NULL, */
86e05cf2	577	PerlIOVia_binmode, /* NULL, */
e7a1fdd7	578	PerlIOVia_getarg,
e7a1fdd7	579	PerlIOVia_fileno,
8cf8f3d1	580	PerlIOVia_dup,
e7a1fdd7	581	PerlIOVia_read,
	582	PerlIOVia_unread,
	583	PerlIOVia_write,
	584	PerlIOVia_seek,
	585	PerlIOVia_tell,
	586	PerlIOVia_close,
	587	PerlIOVia_flush,
	588	PerlIOVia_fill,
	589	PerlIOVia_eof,
	590	PerlIOVia_error,
	591	PerlIOVia_clearerr,
	592	PerlIOVia_setlinebuf,
	593	PerlIOVia_get_base,
	594	PerlIOVia_bufsiz,
	595	PerlIOVia_get_ptr,
	596	PerlIOVia_get_cnt,
	597	PerlIOVia_set_ptrcnt,
	598	};
	599
	600
	601	#endif /* Layers available */
	602
e934609f	603	MODULE = PerlIO::via PACKAGE = PerlIO::via
e7a1fdd7	604	PROTOTYPES: ENABLE;
	605
	606	BOOT:
	607	{
	608	#ifdef PERLIO_LAYERS
	609	PerlIO_define_layer(aTHX_ &PerlIO_object);
	610	#endif
	611	}
	612
fc040538	613
30ef3321	614
	615
	616