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);
147 (mode) ? sv_2mortal(newSVpvn(mode, strlen(mode))) :
150 PerlIOVia_method(aTHX_ f, MYMethod(PUSHED), G_SCALAR,
153 if (sv_isobject(result)) {
154 s->obj = SvREFCNT_inc(result);
157 else if (SvIV(result) != 0)
160 if (PerlIOVia_fetchmethod(aTHX_ s, MYMethod(FILL)) ==
162 PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
164 PerlIOBase(f)->flags |= PERLIO_F_FASTGETS;
167 if (ckWARN(WARN_LAYER))
168 Perl_warner(aTHX_ packWARN(WARN_LAYER),
169 "Cannot find package '%.*s'", (int) pkglen,
186 PerlIOVia_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers,
187 IV n, const char *mode, int fd, int imode, int perm,
188 PerlIO * f, int narg, SV ** args)
191 f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX), self, mode,
196 if (!PerlIO_push(aTHX_ f, self, mode, PerlIOArg))
200 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
203 SV *fdsv = sv_2mortal(newSViv(fd));
205 PerlIOVia_method(aTHX_ f, MYMethod(FDOPEN), G_SCALAR, fdsv,
210 SV *imodesv = sv_2mortal(newSViv(imode));
211 SV *permsv = sv_2mortal(newSViv(perm));
213 PerlIOVia_method(aTHX_ f, MYMethod(SYSOPEN), G_SCALAR,
214 *args, imodesv, permsv, Nullsv);
218 PerlIOVia_method(aTHX_ f, MYMethod(OPEN), G_SCALAR,
223 if (sv_isobject(result))
224 s->obj = SvREFCNT_inc(result);
225 else if (!SvTRUE(result)) {
230 /* Required open method not present */
231 PerlIO_funcs *tab = NULL;
235 PerlIO_layer_fetch(aTHX_ layers, m, NULL);
243 if ((*tab->Open) (aTHX_ tab, layers, m, mode, fd, imode,
244 perm, PerlIONext(f), narg, args)) {
245 PerlIO_debug("Opened with %s => %p->%p\n", tab->name,
246 PerlIONext(f), *PerlIONext(f));
249 * More layers above the one that we used to open -
252 if (PerlIO_apply_layera
253 (aTHX_ PerlIONext(f), mode, layers, m + 1,
255 /* If pushing layers fails close the file */
260 /* FIXME - Call an OPENED method here ? */
264 PerlIO_debug("Open fail %s => %p->%p\n", tab->name,
265 PerlIONext(f), *PerlIONext(f));
266 /* Sub-layer open failed */
270 PerlIO_debug("Nothing to open with");
271 /* Nothing to do the open */
281 PerlIOVia_popped(pTHX_ PerlIO * f)
283 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
284 PerlIOVia_method(aTHX_ f, MYMethod(POPPED), G_VOID, Nullsv);
286 SvREFCNT_dec(s->var);
300 SvREFCNT_dec(s->obj);
307 PerlIOVia_close(pTHX_ PerlIO * f)
309 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
310 IV code = PerlIOBase_close(aTHX_ f);
312 PerlIOVia_method(aTHX_ f, MYMethod(CLOSE), G_SCALAR, Nullsv);
313 if (result && SvIV(result) != 0)
315 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF);
320 PerlIOVia_fileno(pTHX_ PerlIO * f)
322 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
324 PerlIOVia_method(aTHX_ f, MYMethod(FILENO), G_SCALAR, Nullsv);
325 return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
329 PerlIOVia_binmode(pTHX_ PerlIO * f)
331 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
333 PerlIOVia_method(aTHX_ f, MYMethod(BINMODE), G_SCALAR, Nullsv);
334 if (!result || !SvOK(result)) {
342 PerlIOVia_seek(pTHX_ PerlIO * f, Off_t offset, int whence)
344 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
345 SV *offsv = sv_2mortal(newSViv(offset));
346 SV *whsv = sv_2mortal(newSViv(whence));
348 PerlIOVia_method(aTHX_ f, MYMethod(SEEK), G_SCALAR, offsv, whsv,
350 return (result) ? SvIV(result) : -1;
354 PerlIOVia_tell(pTHX_ PerlIO * f)
356 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
358 PerlIOVia_method(aTHX_ f, MYMethod(TELL), G_SCALAR, Nullsv);
359 return (result) ? (Off_t) SvIV(result) : (Off_t) - 1;
363 PerlIOVia_unread(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
365 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
366 SV *buf = sv_2mortal(newSVpvn((char *) vbuf, count));
368 PerlIOVia_method(aTHX_ f, MYMethod(UNREAD), G_SCALAR, buf, Nullsv);
370 return (SSize_t) SvIV(result);
372 return PerlIOBase_unread(aTHX_ f, vbuf, count);
377 PerlIOVia_read(pTHX_ PerlIO * f, void *vbuf, Size_t count)
380 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
381 if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS) {
382 rd = PerlIOBase_read(aTHX_ f, vbuf, count);
385 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
386 SV *buf = sv_2mortal(newSV(count));
387 SV *n = sv_2mortal(newSViv(count));
389 PerlIOVia_method(aTHX_ f, MYMethod(READ), G_SCALAR, buf, n,
392 rd = (SSize_t) SvIV(result);
393 Move(SvPVX(buf), vbuf, rd, char);
402 PerlIOVia_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
404 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
405 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
406 SV *buf = newSVpvn((char *) vbuf, count);
408 PerlIOVia_method(aTHX_ f, MYMethod(WRITE), G_SCALAR, buf,
412 return (SSize_t) SvIV(result);
419 PerlIOVia_fill(pTHX_ PerlIO * f)
421 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
422 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
424 PerlIOVia_method(aTHX_ f, MYMethod(FILL), G_SCALAR, Nullsv);
426 SvREFCNT_dec(s->var);
429 if (result && SvOK(result)) {
431 char *p = SvPV(result, len);
432 s->var = newSVpvn(p, len);
433 s->cnt = SvCUR(s->var);
437 PerlIOBase(f)->flags |= PERLIO_F_EOF;
443 PerlIOVia_flush(pTHX_ PerlIO * f)
445 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
447 PerlIOVia_method(aTHX_ f, MYMethod(FLUSH), G_SCALAR, Nullsv);
448 if (s->var && s->cnt > 0) {
449 SvREFCNT_dec(s->var);
452 return (result) ? SvIV(result) : 0;
456 PerlIOVia_get_base(pTHX_ PerlIO * f)
458 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
459 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
461 return (STDCHAR *) SvPVX(s->var);
464 return (STDCHAR *) Nullch;
468 PerlIOVia_get_ptr(pTHX_ PerlIO * f)
470 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
471 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
473 STDCHAR *p = (STDCHAR *) (SvEND(s->var) - s->cnt);
477 return (STDCHAR *) Nullch;
481 PerlIOVia_get_cnt(pTHX_ PerlIO * f)
483 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
484 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
493 PerlIOVia_bufsiz(pTHX_ PerlIO * f)
495 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
496 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
498 return SvCUR(s->var);
504 PerlIOVia_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
506 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
511 PerlIOVia_setlinebuf(pTHX_ PerlIO * f)
513 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
514 PerlIOVia_method(aTHX_ f, MYMethod(SETLINEBUF), G_VOID, Nullsv);
515 PerlIOBase_setlinebuf(aTHX_ f);
519 PerlIOVia_clearerr(pTHX_ PerlIO * f)
521 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
522 PerlIOVia_method(aTHX_ f, MYMethod(CLEARERR), G_VOID, Nullsv);
523 PerlIOBase_clearerr(aTHX_ f);
527 PerlIOVia_error(pTHX_ PerlIO * f)
529 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
531 PerlIOVia_method(aTHX_ f, "ERROR", &s->mERROR, G_SCALAR, Nullsv);
532 return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
536 PerlIOVia_eof(pTHX_ PerlIO * f)
538 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
540 PerlIOVia_method(aTHX_ f, "EOF", &s->mEOF, G_SCALAR, Nullsv);
541 return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
545 PerlIOVia_getarg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags)
547 PerlIOVia *s = PerlIOSelf(f, PerlIOVia);
548 return PerlIOVia_method(aTHX_ f, MYMethod(GETARG), G_SCALAR, Nullsv);
552 PerlIOVia_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param,
555 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
556 /* Most of the fields will lazily set themselves up as needed
557 stash and obj have been set up by the implied push
565 PerlIO_funcs PerlIO_object = {
566 sizeof(PerlIO_funcs),
569 PERLIO_K_BUFFERED|PERLIO_K_DESTRUCT,
572 PerlIOVia_open, /* NULL, */
573 PerlIOVia_binmode, /* NULL, */
588 PerlIOVia_setlinebuf,
593 PerlIOVia_set_ptrcnt,
597 #endif /* Layers available */
599 MODULE = PerlIO::via PACKAGE = PerlIO::via
605 PerlIO_define_layer(aTHX_ &PerlIO_object);