[p5sagit/p5-mst-13.2.git] / ext / PerlIO-scalar / scalar.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 */
    SV *var;
    Off_t posn;
} PerlIOScalar;

IV
PerlIOScalar_pushed(pTHX_ PerlIO * f, const char *mode, SV * arg,
		    PerlIO_funcs * tab)
{
    IV code;
    PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
    /* If called (normally) via open() then arg is ref to scalar we are
     * using, otherwise arg (from binmode presumably) is either NULL
     * or the _name_ of the scalar
     */
    if (arg) {
	if (SvROK(arg)) {
	    if (SvREADONLY(SvRV(arg)) && mode && *mode != 'r') {
		if (ckWARN(WARN_LAYER))
		    Perl_warner(aTHX_ packWARN(WARN_LAYER), "%s", PL_no_modify);
		SETERRNO(EINVAL, SS_IVCHAN);
		return -1;
	    }
	    s->var = SvREFCNT_inc(SvRV(arg));
	    SvGETMAGIC(s->var);
	    if (!SvPOK(s->var) && SvOK(s->var))
		(void)SvPV_nomg_const_nolen(s->var);
	}
	else {
	    s->var =
		SvREFCNT_inc(perl_get_sv
			     (SvPV_nolen(arg), GV_ADD | GV_ADDMULTI));
	}
    }
    else {
	s->var = newSVpvn("", 0);
    }
    SvUPGRADE(s->var, SVt_PV);
    code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab);
    if (!SvOK(s->var) || (PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE)
	SvCUR_set(s->var, 0);
    if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
	s->posn = SvCUR(s->var);
    else
	s->posn = 0;
    SvSETMAGIC(s->var);
    return code;
}

IV
PerlIOScalar_popped(pTHX_ PerlIO * f)
{
    PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
    if (s->var) {
	SvREFCNT_dec(s->var);
	s->var = Nullsv;
    }
    return 0;
}

IV
PerlIOScalar_close(pTHX_ PerlIO * f)
{
    IV code = PerlIOBase_close(aTHX_ f);
    PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF);
    return code;
}

IV
PerlIOScalar_fileno(pTHX_ PerlIO * f)
{
    return -1;
}

IV
PerlIOScalar_seek(pTHX_ PerlIO * f, Off_t offset, int whence)
{
    PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
    STRLEN oldcur;
    STRLEN newlen;

    SvGETMAGIC(s->var);
    oldcur = SvCUR(s->var);

    switch (whence) {
    case SEEK_SET:
	s->posn = offset;
	break;
    case SEEK_CUR:
	s->posn = offset + s->posn;
	break;
    case SEEK_END:
	s->posn = offset + SvCUR(s->var);
	break;
    }
    if (s->posn < 0) {
        if (ckWARN(WARN_LAYER))
	    Perl_warner(aTHX_ packWARN(WARN_LAYER), "Offset outside string");
	SETERRNO(EINVAL, SS_IVCHAN);
	return -1;
    }
    newlen = (STRLEN) s->posn;
    if (newlen > oldcur) {
	(void) SvGROW(s->var, newlen);
	Zero(SvPVX(s->var) + oldcur, newlen - oldcur, char);
	/* No SvCUR_set(), though.  This is just a seek, not a write. */
    }
    else if (!SvPVX(s->var)) {
	/* ensure there's always a character buffer */
	(void)SvGROW(s->var,1);
    }
    SvPOK_on(s->var);
    return 0;
}

Off_t
PerlIOScalar_tell(pTHX_ PerlIO * f)
{
    PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
    return s->posn;
}


SSize_t
PerlIOScalar_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
{
    if (!f)
	return 0;
    if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
	PerlIOBase(f)->flags |= PERLIO_F_ERROR;
	SETERRNO(EBADF, SS_IVCHAN);
	return 0;
    }
    {
	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	SV *sv = s->var;
	char *p;
	STRLEN len, got;
	p = SvPV(sv, len);
	got = len - (STRLEN)(s->posn);
	if (got <= 0)
	    return 0;
	if (got > (STRLEN)count)
	    got = (STRLEN)count;
	Copy(p + (STRLEN)(s->posn), vbuf, got, STDCHAR);
	s->posn += (Off_t)got;
	return (SSize_t)got;
    }
}

SSize_t
PerlIOScalar_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
{
    if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
	Off_t offset;
	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	SV *sv = s->var;
	char *dst;
	SvGETMAGIC(sv);
	if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) {
	    dst = SvGROW(sv, SvCUR(sv) + count);
	    offset = SvCUR(sv);
	    s->posn = offset + count;
	}
	else {
	    if ((s->posn + count) > SvCUR(sv))
		dst = SvGROW(sv, (STRLEN)s->posn + count);
	    else
		dst = SvPVX(sv);
	    offset = s->posn;
	    s->posn += count;
	}
	Move(vbuf, dst + offset, count, char);
	if ((STRLEN) s->posn > SvCUR(sv))
	    SvCUR_set(sv, (STRLEN)s->posn);
	SvPOK_on(sv);
	SvSETMAGIC(sv);
	return count;
    }
    else
	return 0;
}

IV
PerlIOScalar_fill(pTHX_ PerlIO * f)
{
    return -1;
}

IV
PerlIOScalar_flush(pTHX_ PerlIO * f)
{
    return 0;
}

STDCHAR *
PerlIOScalar_get_base(pTHX_ PerlIO * f)
{
    PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
    if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	SvGETMAGIC(s->var);
	return (STDCHAR *) SvPV_nolen(s->var);
    }
    return (STDCHAR *) NULL;
}

STDCHAR *
PerlIOScalar_get_ptr(pTHX_ PerlIO * f)
{
    if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	return PerlIOScalar_get_base(aTHX_ f) + s->posn;
    }
    return (STDCHAR *) NULL;
}

SSize_t
PerlIOScalar_get_cnt(pTHX_ PerlIO * f)
{
    if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	SvGETMAGIC(s->var);
	if (SvCUR(s->var) > (STRLEN) s->posn)
	    return SvCUR(s->var) - (STRLEN)s->posn;
	else
	    return 0;
    }
    return 0;
}

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

void
PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
{
    PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
    SvGETMAGIC(s->var);
    s->posn = SvCUR(s->var) - cnt;
}

PerlIO *
PerlIOScalar_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)
{
    SV *arg = (narg > 0) ? *args : PerlIOArg;
    if (SvROK(arg) || SvPOK(arg)) {
	if (!f) {
	    f = PerlIO_allocate(aTHX);
	}
	if ( (f = PerlIO_push(aTHX_ f, self, mode, arg)) ) {
	    PerlIOBase(f)->flags |= PERLIO_F_OPEN;
	}
	return f;
    }
    return NULL;
}

SV *
PerlIOScalar_arg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags)
{
    PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
    SV *var = s->var;
    if (flags & PERLIO_DUP_CLONE)
	var = PerlIO_sv_dup(aTHX_ var, param);
    else if (flags & PERLIO_DUP_FD) {
	/* Equivalent (guesses NI-S) of dup() is to create a new scalar */
	var = newSVsv(var);
    }
    else {
	var = SvREFCNT_inc(var);
    }
    return newRV_noinc(var);
}

PerlIO *
PerlIOScalar_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param,
		 int flags)
{
    if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
	PerlIOScalar *fs = PerlIOSelf(f, PerlIOScalar);
	PerlIOScalar *os = PerlIOSelf(o, PerlIOScalar);
	/* var has been set by implicit push */
	fs->posn = os->posn;
    }
    return f;
}

PERLIO_FUNCS_DECL(PerlIO_scalar) = {
    sizeof(PerlIO_funcs),
    "scalar",
    sizeof(PerlIOScalar),
    PERLIO_K_BUFFERED | PERLIO_K_RAW,
    PerlIOScalar_pushed,
    PerlIOScalar_popped,
    PerlIOScalar_open,
    PerlIOBase_binmode,
    PerlIOScalar_arg,
    PerlIOScalar_fileno,
    PerlIOScalar_dup,
    PerlIOScalar_read,
    NULL, /* unread */
    PerlIOScalar_write,
    PerlIOScalar_seek,
    PerlIOScalar_tell,
    PerlIOScalar_close,
    PerlIOScalar_flush,
    PerlIOScalar_fill,
    PerlIOBase_eof,
    PerlIOBase_error,
    PerlIOBase_clearerr,
    PerlIOBase_setlinebuf,
    PerlIOScalar_get_base,
    PerlIOScalar_bufsiz,
    PerlIOScalar_get_ptr,
    PerlIOScalar_get_cnt,
    PerlIOScalar_set_ptrcnt,
};


#endif /* Layers available */

MODULE = PerlIO::scalar	PACKAGE = PerlIO::scalar

PROTOTYPES: ENABLE

BOOT:
{
#ifdef PERLIO_LAYERS
 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_scalar));
#endif
}
Commit	Line	Data
f6c77cf1	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
14d89041	9	typedef struct {
	10	struct _PerlIO base; /* Base "class" info */
	11	SV *var;
	12	Off_t posn;
f6c77cf1	13	} PerlIOScalar;
	14
	15	IV
14d89041	16	PerlIOScalar_pushed(pTHX_ PerlIO * f, const char mode, SV arg,
14d89041	17	PerlIO_funcs * tab)
f6c77cf1	18	{
14d89041	19	IV code;
	20	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	21	/* If called (normally) via open() then arg is ref to scalar we are
	22	* using, otherwise arg (from binmode presumably) is either NULL
	23	* or the _name_ of the scalar
	24	*/
	25	if (arg) {
cba44c14	26	if (SvROK(arg)) {
b35bc0c6	27	if (SvREADONLY(SvRV(arg)) && mode && *mode != 'r') {
b35bc0c6	28	if (ckWARN(WARN_LAYER))
76c6a213	29	Perl_warner(aTHX_ packWARN(WARN_LAYER), "%s", PL_no_modify);
42bc49da	30	SETERRNO(EINVAL, SS_IVCHAN);
b35bc0c6	31	return -1;
b35bc0c6	32	}
14d89041	33	s->var = SvREFCNT_inc(SvRV(arg));
22ccb26d	34	SvGETMAGIC(s->var);
	35	if (!SvPOK(s->var) && SvOK(s->var))
	36	(void)SvPV_nomg_const_nolen(s->var);
14d89041	37	}
	38	else {
	39	s->var =
	40	SvREFCNT_inc(perl_get_sv
	41	(SvPV_nolen(arg), GV_ADD \| GV_ADDMULTI));
	42	}
564dc057	43	}
14d89041	44	else {
14d89041	45	s->var = newSVpvn("", 0);
564dc057	46	}
c5b94a97	47	SvUPGRADE(s->var, SVt_PV);
14d89041	48	code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab);
47cc46ee	49	if (!SvOK(s->var) \|\| (PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE)
b162af07	50	SvCUR_set(s->var, 0);
14d89041	51	if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
	52	s->posn = SvCUR(s->var);
	53	else
	54	s->posn = 0;
ffe0bb5a	55	SvSETMAGIC(s->var);
14d89041	56	return code;
f6c77cf1	57	}
	58
	59	IV
14d89041	60	PerlIOScalar_popped(pTHX_ PerlIO * f)
f6c77cf1	61	{
14d89041	62	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	63	if (s->var) {
	64	SvREFCNT_dec(s->var);
	65	s->var = Nullsv;
	66	}
	67	return 0;
f6c77cf1	68	}
	69
	70	IV
14d89041	71	PerlIOScalar_close(pTHX_ PerlIO * f)
f6c77cf1	72	{
14d89041	73	IV code = PerlIOBase_close(aTHX_ f);
	74	PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF \| PERLIO_F_WRBUF);
	75	return code;
f6c77cf1	76	}
	77
	78	IV
14d89041	79	PerlIOScalar_fileno(pTHX_ PerlIO * f)
f6c77cf1	80	{
14d89041	81	return -1;
f6c77cf1	82	}
	83
	84	IV
14d89041	85	PerlIOScalar_seek(pTHX_ PerlIO * f, Off_t offset, int whence)
f6c77cf1	86	{
14d89041	87	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
e94207f0	88	STRLEN oldcur;
42bc49da	89	STRLEN newlen;
e94207f0	90
	91	SvGETMAGIC(s->var);
	92	oldcur = SvCUR(s->var);
	93
14d89041	94	switch (whence) {
42bc49da	95	case SEEK_SET:
14d89041	96	s->posn = offset;
14d89041	97	break;
42bc49da	98	case SEEK_CUR:
14d89041	99	s->posn = offset + s->posn;
14d89041	100	break;
42bc49da	101	case SEEK_END:
14d89041	102	s->posn = offset + SvCUR(s->var);
	103	break;
	104	}
42bc49da	105	if (s->posn < 0) {
	106	if (ckWARN(WARN_LAYER))
	107	Perl_warner(aTHX_ packWARN(WARN_LAYER), "Offset outside string");
	108	SETERRNO(EINVAL, SS_IVCHAN);
	109	return -1;
14d89041	110	}
42bc49da	111	newlen = (STRLEN) s->posn;
	112	if (newlen > oldcur) {
	113	(void) SvGROW(s->var, newlen);
	114	Zero(SvPVX(s->var) + oldcur, newlen - oldcur, char);
	115	/* No SvCUR_set(), though. This is just a seek, not a write. */
	116	}
8b8eea96	117	else if (!SvPVX(s->var)) {
	118	/* ensure there's always a character buffer */
	119	(void)SvGROW(s->var,1);
	120	}
42bc49da	121	SvPOK_on(s->var);
14d89041	122	return 0;
f6c77cf1	123	}
	124
	125	Off_t
14d89041	126	PerlIOScalar_tell(pTHX_ PerlIO * f)
f6c77cf1	127	{
14d89041	128	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
14d89041	129	return s->posn;
f6c77cf1	130	}
f6c77cf1	131
ffe0bb5a	132
	133	SSize_t
	134	PerlIOScalar_read(pTHX_ PerlIO f, void vbuf, Size_t count)
	135	{
	136	if (!f)
	137	return 0;
	138	if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
	139	PerlIOBase(f)->flags \|= PERLIO_F_ERROR;
	140	SETERRNO(EBADF, SS_IVCHAN);
	141	return 0;
	142	}
	143	{
	144	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	145	SV *sv = s->var;
	146	char *p;
	147	STRLEN len, got;
	148	p = SvPV(sv, len);
	149	got = len - (STRLEN)(s->posn);
	150	if (got <= 0)
	151	return 0;
	152	if (got > (STRLEN)count)
	153	got = (STRLEN)count;
	154	Copy(p + (STRLEN)(s->posn), vbuf, got, STDCHAR);
	155	s->posn += (Off_t)got;
	156	return (SSize_t)got;
	157	}
	158	}
	159
f6c77cf1	160	SSize_t
14d89041	161	PerlIOScalar_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
f6c77cf1	162	{
14d89041	163	if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
	164	Off_t offset;
	165	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	166	SV *sv = s->var;
	167	char *dst;
ffe0bb5a	168	SvGETMAGIC(sv);
14d89041	169	if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) {
	170	dst = SvGROW(sv, SvCUR(sv) + count);
	171	offset = SvCUR(sv);
	172	s->posn = offset + count;
	173	}
	174	else {
	175	if ((s->posn + count) > SvCUR(sv))
4a9d6100	176	dst = SvGROW(sv, (STRLEN)s->posn + count);
14d89041	177	else
ffe0bb5a	178	dst = SvPVX(sv);
14d89041	179	offset = s->posn;
	180	s->posn += count;
	181	}
	182	Move(vbuf, dst + offset, count, char);
	183	if ((STRLEN) s->posn > SvCUR(sv))
4a9d6100	184	SvCUR_set(sv, (STRLEN)s->posn);
ffe0bb5a	185	SvPOK_on(sv);
ffe0bb5a	186	SvSETMAGIC(sv);
14d89041	187	return count;
09bf542c	188	}
14d89041	189	else
14d89041	190	return 0;
f6c77cf1	191	}
	192
	193	IV
14d89041	194	PerlIOScalar_fill(pTHX_ PerlIO * f)
f6c77cf1	195	{
14d89041	196	return -1;
f6c77cf1	197	}
	198
	199	IV
14d89041	200	PerlIOScalar_flush(pTHX_ PerlIO * f)
f6c77cf1	201	{
14d89041	202	return 0;
f6c77cf1	203	}
	204
	205	STDCHAR *
14d89041	206	PerlIOScalar_get_base(pTHX_ PerlIO * f)
f6c77cf1	207	{
14d89041	208	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
14d89041	209	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
ffe0bb5a	210	SvGETMAGIC(s->var);
14d89041	211	return (STDCHAR *) SvPV_nolen(s->var);
14d89041	212	}
9849c14c	213	return (STDCHAR *) NULL;
f6c77cf1	214	}
	215
	216	STDCHAR *
14d89041	217	PerlIOScalar_get_ptr(pTHX_ PerlIO * f)
f6c77cf1	218	{
14d89041	219	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
	220	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	221	return PerlIOScalar_get_base(aTHX_ f) + s->posn;
	222	}
9849c14c	223	return (STDCHAR *) NULL;
f6c77cf1	224	}
	225
	226	SSize_t
14d89041	227	PerlIOScalar_get_cnt(pTHX_ PerlIO * f)
f6c77cf1	228	{
14d89041	229	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
14d89041	230	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
ffe0bb5a	231	SvGETMAGIC(s->var);
14d89041	232	if (SvCUR(s->var) > (STRLEN) s->posn)
4a9d6100	233	return SvCUR(s->var) - (STRLEN)s->posn;
14d89041	234	else
	235	return 0;
	236	}
75effbe0	237	return 0;
f6c77cf1	238	}
	239
	240	Size_t
14d89041	241	PerlIOScalar_bufsiz(pTHX_ PerlIO * f)
f6c77cf1	242	{
14d89041	243	if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
14d89041	244	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
ffe0bb5a	245	SvGETMAGIC(s->var);
14d89041	246	return SvCUR(s->var);
	247	}
	248	return 0;
f6c77cf1	249	}
	250
	251	void
14d89041	252	PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
f6c77cf1	253	{
14d89041	254	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
ffe0bb5a	255	SvGETMAGIC(s->var);
14d89041	256	s->posn = SvCUR(s->var) - cnt;
f6c77cf1	257	}
	258
	259	PerlIO *
14d89041	260	PerlIOScalar_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers, IV n,
	261	const char *mode, int fd, int imode, int perm,
	262	PerlIO * f, int narg, SV ** args)
f6c77cf1	263	{
14d89041	264	SV arg = (narg > 0) ? args : PerlIOArg;
	265	if (SvROK(arg) \|\| SvPOK(arg)) {
	266	if (!f) {
	267	f = PerlIO_allocate(aTHX);
	268	}
e3feee4e	269	if ( (f = PerlIO_push(aTHX_ f, self, mode, arg)) ) {
14d89041	270	PerlIOBase(f)->flags \|= PERLIO_F_OPEN;
	271	}
	272	return f;
	273	}
	274	return NULL;
f6c77cf1	275	}
f6c77cf1	276
ecdeb87c	277	SV *
14d89041	278	PerlIOScalar_arg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags)
ecdeb87c	279	{
14d89041	280	PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
	281	SV *var = s->var;
	282	if (flags & PERLIO_DUP_CLONE)
	283	var = PerlIO_sv_dup(aTHX_ var, param);
	284	else if (flags & PERLIO_DUP_FD) {
	285	/* Equivalent (guesses NI-S) of dup() is to create a new scalar */
	286	var = newSVsv(var);
	287	}
	288	else {
	289	var = SvREFCNT_inc(var);
	290	}
	291	return newRV_noinc(var);
ecdeb87c	292	}
ecdeb87c	293
8cf8f3d1	294	PerlIO *
14d89041	295	PerlIOScalar_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param,
14d89041	296	int flags)
8cf8f3d1	297	{
14d89041	298	if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
	299	PerlIOScalar *fs = PerlIOSelf(f, PerlIOScalar);
	300	PerlIOScalar *os = PerlIOSelf(o, PerlIOScalar);
	301	/* var has been set by implicit push */
	302	fs->posn = os->posn;
	303	}
	304	return f;
8cf8f3d1	305	}
f6c77cf1	306
27da23d5	307	PERLIO_FUNCS_DECL(PerlIO_scalar) = {
14d89041	308	sizeof(PerlIO_funcs),
	309	"scalar",
	310	sizeof(PerlIOScalar),
	311	PERLIO_K_BUFFERED \| PERLIO_K_RAW,
	312	PerlIOScalar_pushed,
	313	PerlIOScalar_popped,
	314	PerlIOScalar_open,
	315	PerlIOBase_binmode,
	316	PerlIOScalar_arg,
	317	PerlIOScalar_fileno,
	318	PerlIOScalar_dup,
ffe0bb5a	319	PerlIOScalar_read,
3ff3a8b6	320	NULL, /* unread */
14d89041	321	PerlIOScalar_write,
	322	PerlIOScalar_seek,
	323	PerlIOScalar_tell,
	324	PerlIOScalar_close,
	325	PerlIOScalar_flush,
	326	PerlIOScalar_fill,
	327	PerlIOBase_eof,
	328	PerlIOBase_error,
	329	PerlIOBase_clearerr,
	330	PerlIOBase_setlinebuf,
	331	PerlIOScalar_get_base,
	332	PerlIOScalar_bufsiz,
	333	PerlIOScalar_get_ptr,
	334	PerlIOScalar_get_cnt,
	335	PerlIOScalar_set_ptrcnt,
f6c77cf1	336	};
	337
	338
	339	#endif /* Layers available */
	340
e934609f	341	MODULE = PerlIO::scalar PACKAGE = PerlIO::scalar
f6c77cf1	342
acf4de66	343	PROTOTYPES: ENABLE
acf4de66	344
f6c77cf1	345	BOOT:
	346	{
	347	#ifdef PERLIO_LAYERS
27da23d5	348	PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_scalar));
f6c77cf1	349	#endif
	350	}
	351