1 #define PERL_NO_GET_CONTEXT
11 struct _PerlIO base; /* Base "class" info */
40 #define MYMethod(x) #x,&s->x
43 PerlIOVia_fetchmethod(pTHX_ PerlIOVia * s, char *method, CV ** save)
45 GV *gv = gv_fetchmeth(s->stash, method, strlen(method), 0);
47 Perl_warn(aTHX_ "Lookup %s::%s => %p", HvNAME(s->stash), method, gv);
50 return *save = GvCV(gv);
53 return *save = (CV *) - 1;
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
66 PerlIOVia_method(pTHX_ PerlIO * f, char *method, CV ** save, int flags,
69 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
71 (*save) ? *save : PerlIOVia_fetchmethod(aTHX_ s, method, save);
75 if (cv != (CV *) - 1) {
79 PUSHSTACKi(PERLSI_MAGIC);
84 while ((arg = va_arg(ap, SV *))) {
89 GV *gv = newGVgen(HvNAME(s->stash));
91 s->fh = newRV_noinc((SV *) gv);
94 IoIFP(s->io) = PerlIONext(f);
95 IoOFP(s->io) = PerlIONext(f);
99 PerlIO_debug("No next\n");
100 /* FIXME: How should this work for OPEN etc? */
103 count = call_sv((SV *) cv, flags);
110 result = &PL_sv_undef;
120 PerlIOVia_pushed(pTHX_ PerlIO * f, const char *mode, SV * arg,
123 IV code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab);
125 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
127 if (ckWARN(WARN_LAYER))
128 Perl_warner(aTHX_ packWARN(WARN_LAYER),
129 "No package specified");
135 char *pkg = SvPV(arg, pkglen);
136 s->obj = SvREFCNT_inc(arg);
137 s->stash = gv_stashpvn(pkg, pkglen, FALSE);
140 newSVpvn(Perl_form(aTHX_ "PerlIO::via::%s", pkg),
143 s->stash = gv_stashpvn(SvPVX(s->obj), pkglen + 13, FALSE);
150 /* binmode() passes NULL - so find out what mode is */
151 mode = PerlIO_modestr(f,lmode);
153 modesv = sv_2mortal(newSVpvn(mode, strlen(mode)));
154 result = PerlIOVia_method(aTHX_ f, MYMethod(PUSHED), G_SCALAR,
157 if (sv_isobject(result)) {
158 s->obj = SvREFCNT_inc(result);
161 else if (SvIV(result) != 0)
164 if (PerlIOVia_fetchmethod(aTHX_ s, MYMethod(FILL)) ==
166 PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
168 PerlIOBase(f)->flags |= PERLIO_F_FASTGETS;
171 if (ckWARN(WARN_LAYER))
172 Perl_warner(aTHX_ packWARN(WARN_LAYER),
173 "Cannot find package '%.*s'", (int) pkglen,
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)
195 f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX), self, mode,
200 if (!PerlIO_push(aTHX_ f, self, mode, PerlIOArg))
204 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
207 SV *fdsv = sv_2mortal(newSViv(fd));
209 PerlIOVia_method(aTHX_ f, MYMethod(FDOPEN), G_SCALAR, fdsv,
214 SV *imodesv = sv_2mortal(newSViv(imode));
215 SV *permsv = sv_2mortal(newSViv(perm));
217 PerlIOVia_method(aTHX_ f, MYMethod(SYSOPEN), G_SCALAR,
218 *args, imodesv, permsv, Nullsv);
222 PerlIOVia_method(aTHX_ f, MYMethod(OPEN), G_SCALAR,
227 if (sv_isobject(result))
228 s->obj = SvREFCNT_inc(result);
229 else if (!SvTRUE(result)) {
234 /* Required open method not present */
235 PerlIO_funcs *tab = NULL;
239 PerlIO_layer_fetch(aTHX_ layers, m, NULL);
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));
253 * More layers above the one that we used to open -
256 if (PerlIO_apply_layera
257 (aTHX_ PerlIONext(f), mode, layers, m + 1,
259 /* If pushing layers fails close the file */
264 /* FIXME - Call an OPENED method here ? */
268 PerlIO_debug("Open fail %s => %p->%p\n", tab->name,
269 PerlIONext(f), *PerlIONext(f));
270 /* Sub-layer open failed */
274 PerlIO_debug("Nothing to open with");
275 /* Nothing to do the open */
285 PerlIOVia_popped(pTHX_ PerlIO * f)
287 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
288 PerlIOVia_method(aTHX_ f, MYMethod(POPPED), G_VOID, Nullsv);
290 SvREFCNT_dec(s->var);
304 SvREFCNT_dec(s->obj);
311 PerlIOVia_close(pTHX_ PerlIO * f)
313 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
314 IV code = PerlIOBase_close(aTHX_ f);
316 PerlIOVia_method(aTHX_ f, MYMethod(CLOSE), G_SCALAR, Nullsv);
317 if (result && SvIV(result) != 0)
319 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF);
324 PerlIOVia_fileno(pTHX_ PerlIO * f)
326 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
328 PerlIOVia_method(aTHX_ f, MYMethod(FILENO), G_SCALAR, Nullsv);
329 return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
333 PerlIOVia_binmode(pTHX_ PerlIO * f)
335 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
337 PerlIOVia_method(aTHX_ f, MYMethod(BINMODE), G_SCALAR, Nullsv);
338 if (!result || !SvOK(result)) {
346 PerlIOVia_seek(pTHX_ PerlIO * f, Off_t offset, int whence)
348 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
349 SV *offsv = sv_2mortal(newSViv(offset));
350 SV *whsv = sv_2mortal(newSViv(whence));
352 PerlIOVia_method(aTHX_ f, MYMethod(SEEK), G_SCALAR, offsv, whsv,
354 return (result) ? SvIV(result) : -1;
358 PerlIOVia_tell(pTHX_ PerlIO * f)
360 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
362 PerlIOVia_method(aTHX_ f, MYMethod(TELL), G_SCALAR, Nullsv);
363 return (result) ? (Off_t) SvIV(result) : (Off_t) - 1;
367 PerlIOVia_unread(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
369 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
370 SV *buf = sv_2mortal(newSVpvn((char *) vbuf, count));
372 PerlIOVia_method(aTHX_ f, MYMethod(UNREAD), G_SCALAR, buf, Nullsv);
374 return (SSize_t) SvIV(result);
376 return PerlIOBase_unread(aTHX_ f, vbuf, count);
381 PerlIOVia_read(pTHX_ PerlIO * f, void *vbuf, Size_t count)
384 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
385 if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS) {
386 rd = PerlIOBase_read(aTHX_ f, vbuf, count);
389 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
390 SV *buf = sv_2mortal(newSV(count));
391 SV *n = sv_2mortal(newSViv(count));
393 PerlIOVia_method(aTHX_ f, MYMethod(READ), G_SCALAR, buf, n,
396 rd = (SSize_t) SvIV(result);
397 Move(SvPVX(buf), vbuf, rd, char);
406 PerlIOVia_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
408 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
409 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
410 SV *buf = newSVpvn((char *) vbuf, count);
412 PerlIOVia_method(aTHX_ f, MYMethod(WRITE), G_SCALAR, buf,
416 return (SSize_t) SvIV(result);
423 PerlIOVia_fill(pTHX_ PerlIO * f)
425 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
426 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
428 PerlIOVia_method(aTHX_ f, MYMethod(FILL), G_SCALAR, Nullsv);
430 SvREFCNT_dec(s->var);
433 if (result && SvOK(result)) {
435 char *p = SvPV(result, len);
436 s->var = newSVpvn(p, len);
437 s->cnt = SvCUR(s->var);
441 PerlIOBase(f)->flags |= PERLIO_F_EOF;
447 PerlIOVia_flush(pTHX_ PerlIO * f)
449 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
451 PerlIOVia_method(aTHX_ f, MYMethod(FLUSH), G_SCALAR, Nullsv);
452 if (s->var && s->cnt > 0) {
453 SvREFCNT_dec(s->var);
456 return (result) ? SvIV(result) : 0;
460 PerlIOVia_get_base(pTHX_ PerlIO * f)
462 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
463 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
465 return (STDCHAR *) SvPVX(s->var);
468 return (STDCHAR *) Nullch;
472 PerlIOVia_get_ptr(pTHX_ PerlIO * f)
474 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
475 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
477 STDCHAR *p = (STDCHAR *) (SvEND(s->var) - s->cnt);
481 return (STDCHAR *) Nullch;
485 PerlIOVia_get_cnt(pTHX_ PerlIO * f)
487 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
488 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
497 PerlIOVia_bufsiz(pTHX_ PerlIO * f)
499 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
500 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
502 return SvCUR(s->var);
508 PerlIOVia_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
510 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
515 PerlIOVia_setlinebuf(pTHX_ PerlIO * f)
517 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
518 PerlIOVia_method(aTHX_ f, MYMethod(SETLINEBUF), G_VOID, Nullsv);
519 PerlIOBase_setlinebuf(aTHX_ f);
523 PerlIOVia_clearerr(pTHX_ PerlIO * f)
525 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
526 PerlIOVia_method(aTHX_ f, MYMethod(CLEARERR), G_VOID, Nullsv);
527 PerlIOBase_clearerr(aTHX_ f);
531 PerlIOVia_error(pTHX_ PerlIO * f)
533 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
535 PerlIOVia_method(aTHX_ f, "ERROR", &s->mERROR, G_SCALAR, Nullsv);
536 return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
540 PerlIOVia_eof(pTHX_ PerlIO * f)
542 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
544 PerlIOVia_method(aTHX_ f, "EOF", &s->mEOF, G_SCALAR, Nullsv);
545 return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
549 PerlIOVia_getarg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags)
551 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
552 return PerlIOVia_method(aTHX_ f, MYMethod(GETARG), G_SCALAR, Nullsv);
556 PerlIOVia_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param,
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
569 PerlIO_funcs PerlIO_object = {
570 sizeof(PerlIO_funcs),
573 PERLIO_K_BUFFERED|PERLIO_K_DESTRUCT,
576 PerlIOVia_open, /* NULL, */
577 PerlIOVia_binmode, /* NULL, */
592 PerlIOVia_setlinebuf,
597 PerlIOVia_set_ptrcnt,
601 #endif /* Layers available */
603 MODULE = PerlIO::via PACKAGE = PerlIO::via
609 PerlIO_define_layer(aTHX_ &PerlIO_object);