1 #define PERL_NO_GET_CONTEXT
11 struct _PerlIO base; /* Base "class" info */
39 #define MYMethod(x) #x,&s->x
42 PerlIOVia_fetchmethod(pTHX_ PerlIOVia *s,char *method,CV **save)
44 GV *gv = gv_fetchmeth(s->stash,method,strlen(method),0);
46 Perl_warn(aTHX_ "Lookup %s::%s => %p",HvNAME(s->stash),method,gv);
50 return *save = GvCV(gv);
54 return *save = (CV *) -1;
59 * Try and call method, possibly via cached lookup.
60 * If method does not exist return Nullsv (caller may fallback to another approach
61 * If method does exist call it with flags passing variable number of args
62 * Last arg is a "filehandle" to layer below (if present)
63 * Returns scalar returned by method (if any) otherwise sv_undef
67 PerlIOVia_method(pTHX_ PerlIO *f,char *method,CV **save,int flags,...)
69 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
70 CV *cv = (*save) ? *save : PerlIOVia_fetchmethod(aTHX_ s,method,save);
82 while ((arg = va_arg(ap,SV *)))
90 GV *gv = newGVgen(HvNAME(s->stash));
92 s->fh = newRV_noinc((SV *)gv);
95 IoIFP(s->io) = PerlIONext(f);
96 IoOFP(s->io) = PerlIONext(f);
101 PerlIO_debug("No next\n");
104 count = call_sv((SV *)cv,flags);
113 result = &PL_sv_undef;
122 PerlIOVia_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg)
124 IV code = PerlIOBase_pushed(aTHX_ f,mode,Nullsv);
127 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
130 if (ckWARN(WARN_LAYER))
131 Perl_warner(aTHX_ packWARN(WARN_LAYER), "No package specified");
138 char *pkg = SvPV(arg,pkglen);
139 s->obj = SvREFCNT_inc(arg);
140 s->stash = gv_stashpvn(pkg, pkglen, FALSE);
143 SV *modesv = (mode) ? sv_2mortal(newSVpvn(mode,strlen(mode))) : Nullsv;
144 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(PUSHED),G_SCALAR,modesv,Nullsv);
147 if (sv_isobject(result))
149 s->obj = SvREFCNT_inc(result);
152 else if (SvIV(result) != 0)
155 if (PerlIOVia_fetchmethod(aTHX_ s,MYMethod(FILL)) == (CV *) -1)
156 PerlIOBase(f)->flags &= ~PERLIO_F_FASTGETS;
158 PerlIOBase(f)->flags |= PERLIO_F_FASTGETS;
162 if (ckWARN(WARN_LAYER))
163 Perl_warner(aTHX_ packWARN(WARN_LAYER), "Cannot find package '%.*s'",(int) pkglen,pkg);
179 PerlIOVia_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers, IV n,
180 const char *mode, int fd, int imode, int perm,
181 PerlIO *f, int narg, SV **args)
185 f = PerlIO_push(aTHX_ PerlIO_allocate(aTHX),self,mode,PerlIOArg);
190 if (!PerlIO_push(aTHX_ f,self,mode,PerlIOArg))
195 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
199 SV *fdsv = sv_2mortal(newSViv(fd));
200 result = PerlIOVia_method(aTHX_ f,MYMethod(FDOPEN),G_SCALAR,fdsv,Nullsv);
206 SV *imodesv = sv_2mortal(newSViv(imode));
207 SV *permsv = sv_2mortal(newSViv(perm));
208 result = PerlIOVia_method(aTHX_ f,MYMethod(SYSOPEN),G_SCALAR,*args,imodesv,permsv,Nullsv);
212 result = PerlIOVia_method(aTHX_ f,MYMethod(OPEN),G_SCALAR,*args,Nullsv);
217 if (sv_isobject(result))
218 s->obj = SvREFCNT_inc(result);
219 else if (!SvTRUE(result))
226 /* Required open method not present */
227 PerlIO_funcs *tab = NULL;
230 PerlIO_funcs *t = PerlIO_layer_fetch(aTHX_ layers, m, NULL);
238 if ((*tab->Open) (aTHX_ tab, layers, m, mode, fd, imode, perm,
239 PerlIONext(f), narg, args)) {
240 PerlIO_debug("Opened with %s => %p->%p\n",tab->name,PerlIONext(f),*PerlIONext(f));
243 * More layers above the one that we used to open -
246 if (PerlIO_apply_layera(aTHX_ PerlIONext(f), mode, layers, m+1, n) != 0) {
247 /* If pushing layers fails close the file */
255 /* Sub-layer open failed */
259 /* Nothing to do the open */
268 PerlIOVia_popped(pTHX_ PerlIO *f)
270 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
271 PerlIOVia_method(aTHX_ f,MYMethod(POPPED),G_VOID,Nullsv);
274 SvREFCNT_dec(s->var);
291 SvREFCNT_dec(s->obj);
298 PerlIOVia_close(pTHX_ PerlIO *f)
300 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
301 IV code = PerlIOBase_close(aTHX_ f);
302 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(CLOSE),G_SCALAR,Nullsv);
303 if (result && SvIV(result) != 0)
305 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF|PERLIO_F_WRBUF);
310 PerlIOVia_fileno(pTHX_ PerlIO *f)
312 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
313 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILENO),G_SCALAR,Nullsv);
314 return (result) ? SvIV(result) : PerlIO_fileno(PerlIONext(f));
318 PerlIOVia_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
320 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
321 SV *offsv = sv_2mortal(newSViv(offset));
322 SV *whsv = sv_2mortal(newSViv(whence));
323 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(SEEK),G_SCALAR,offsv,whsv,Nullsv);
324 return (result) ? SvIV(result) : -1;
328 PerlIOVia_tell(pTHX_ PerlIO *f)
330 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
331 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(TELL),G_SCALAR,Nullsv);
332 return (result) ? (Off_t) SvIV(result) : (Off_t) -1;
336 PerlIOVia_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
338 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
339 SV *buf = sv_2mortal(newSVpvn((char *)vbuf,count));
340 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(UNREAD),G_SCALAR,buf,Nullsv);
342 return (SSize_t) SvIV(result);
345 return PerlIOBase_unread(aTHX_ f,vbuf,count);
350 PerlIOVia_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
353 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
355 if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)
357 rd = PerlIOBase_read(aTHX_ f,vbuf,count);
361 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
362 SV *buf = sv_2mortal(newSV(count));
363 SV *n = sv_2mortal(newSViv(count));
364 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(READ),G_SCALAR,buf,n,Nullsv);
367 rd = (SSize_t) SvIV(result);
368 Move(SvPVX(buf),vbuf,rd,char);
377 PerlIOVia_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
379 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
381 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
382 SV *buf = newSVpvn((char *)vbuf,count);
383 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(WRITE),G_SCALAR,buf,Nullsv);
386 return (SSize_t) SvIV(result);
393 PerlIOVia_fill(pTHX_ PerlIO *f)
395 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
397 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
398 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FILL),G_SCALAR,Nullsv);
401 SvREFCNT_dec(s->var);
404 if (result && SvOK(result))
407 char *p = SvPV(result,len);
408 s->var = newSVpvn(p,len);
409 s->cnt = SvCUR(s->var);
413 PerlIOBase(f)->flags |= PERLIO_F_EOF;
419 PerlIOVia_flush(pTHX_ PerlIO *f)
421 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
422 SV *result = PerlIOVia_method(aTHX_ f,MYMethod(FLUSH),G_SCALAR,Nullsv);
423 if (s->var && s->cnt > 0)
425 SvREFCNT_dec(s->var);
428 return (result) ? SvIV(result) : 0;
432 PerlIOVia_get_base(pTHX_ PerlIO *f)
434 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
436 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
439 return (STDCHAR *)SvPVX(s->var);
442 return (STDCHAR *) Nullch;
446 PerlIOVia_get_ptr(pTHX_ PerlIO *f)
448 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
450 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
453 STDCHAR *p = (STDCHAR *)(SvEND(s->var) - s->cnt);
457 return (STDCHAR *) Nullch;
461 PerlIOVia_get_cnt(pTHX_ PerlIO *f)
463 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
465 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
475 PerlIOVia_bufsiz(pTHX_ PerlIO *f)
477 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
479 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
481 return SvCUR(s->var);
487 PerlIOVia_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR *ptr, SSize_t cnt)
489 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
494 PerlIOVia_setlinebuf(pTHX_ PerlIO *f)
496 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
497 PerlIOVia_method(aTHX_ f,MYMethod(SETLINEBUF),G_VOID,Nullsv);
498 PerlIOBase_setlinebuf(aTHX_ f);
502 PerlIOVia_clearerr(pTHX_ PerlIO *f)
504 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
505 PerlIOVia_method(aTHX_ f,MYMethod(CLEARERR),G_VOID,Nullsv);
506 PerlIOBase_clearerr(aTHX_ f);
510 PerlIOVia_error(pTHX_ PerlIO *f)
512 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
513 SV *result = PerlIOVia_method(aTHX_ f,"ERROR",&s->mERROR,G_SCALAR,Nullsv);
514 return (result) ? SvIV(result) : PerlIOBase_error(aTHX_ f);
518 PerlIOVia_eof(pTHX_ PerlIO *f)
520 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
521 SV *result = PerlIOVia_method(aTHX_ f,"EOF",&s->mEOF,G_SCALAR,Nullsv);
522 return (result) ? SvIV(result) : PerlIOBase_eof(aTHX_ f);
526 PerlIOVia_getarg(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
528 PerlIOVia *s = PerlIOSelf(f,PerlIOVia);
529 return PerlIOVia_method(aTHX_ f,MYMethod(GETARG),G_SCALAR,Nullsv);
533 PerlIOVia_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
535 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags)))
537 /* Most of the fields will lazily set themselves up as needed
538 stash and obj have been set up by the implied push
544 PerlIO_funcs PerlIO_object = {
547 PERLIO_K_BUFFERED|PERLIO_K_DESTRUCT,
550 PerlIOVia_open, /* NULL, */
565 PerlIOVia_setlinebuf,
570 PerlIOVia_set_ptrcnt,
574 #endif /* Layers available */
576 MODULE = PerlIO::Via PACKAGE = PerlIO::Via
582 PerlIO_define_layer(aTHX_ &PerlIO_object);