#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)) {
s->var = SvREFCNT_inc(SvRV(arg));
if (!SvPOK(s->var) && SvTYPE(SvRV(arg)) > SVt_NULL)
(void)SvPV_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 ((PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE)
SvCUR(s->var) = 0;
if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
s->posn = SvCUR(s->var);
else
s->posn = 0;
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);
switch (whence) {
case 0:
s->posn = offset;
break;
case 1:
s->posn = offset + s->posn;
break;
case 2:
s->posn = offset + SvCUR(s->var);
break;
}
if ((STRLEN) s->posn > SvCUR(s->var)) {
(void) SvGROW(s->var, (STRLEN) s->posn);
}
return 0;
}
Off_t
PerlIOScalar_tell(pTHX_ PerlIO * f)
{
PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
return s->posn;
}
SSize_t
PerlIOScalar_unread(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
{
PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
char *dst = SvGROW(s->var, (STRLEN)s->posn + count);
Move(vbuf, dst + s->posn, count, char);
s->posn += count;
SvCUR_set(s->var, (STRLEN)s->posn);
SvPOK_on(s->var);
return count;
}
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;
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 = SvPV_nolen(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(s->var);
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) {
return (STDCHAR *) SvPV_nolen(s->var);
}
return (STDCHAR *) Nullch;
}
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 *) Nullch;
}
SSize_t
PerlIOScalar_get_cnt(pTHX_ PerlIO * f)
{
if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
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);
return SvCUR(s->var);
}
return 0;
}
void
PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
{
PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
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 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,
PerlIOBase_read,
PerlIOScalar_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_scalar);
#endif
}