1 #define PERL_NO_GET_CONTEXT
11 struct _PerlIO base; /* Base "class" info */
17 PerlIOScalar_pushed(PerlIO *f, const char *mode, SV *arg)
21 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
22 /* If called (normally) via open() then arg is ref to scalar we are
23 using, otherwise arg (from binmode presumably) is either NULL
24 or the _name_ of the scalar
30 s->var = SvREFCNT_inc(SvRV(arg));
34 s->var = SvREFCNT_inc(perl_get_sv(SvPV_nolen(arg),GV_ADD|GV_ADDMULTI));
39 s->var = newSVpvn("",0);
41 sv_upgrade(s->var,SVt_PV);
42 code = PerlIOBase_pushed(f,mode,Nullsv);
43 if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
44 s->posn = SvCUR(SvRV(arg));
47 if ((PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE)
53 PerlIOScalar_popped(PerlIO *f)
55 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
66 PerlIOScalar_close(PerlIO *f)
68 IV code = PerlIOBase_close(f);
69 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF|PERLIO_F_WRBUF);
74 PerlIOScalar_fileno(PerlIO *f)
80 PerlIOScalar_seek(PerlIO *f, Off_t offset, int whence)
82 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
89 s->posn = offset + s->posn;
92 s->posn = offset + SvCUR(s->var);
95 if (s->posn > SvCUR(s->var))
98 (void) SvGROW(s->var,s->posn);
104 PerlIOScalar_tell(PerlIO *f)
106 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
111 PerlIOScalar_unread(PerlIO *f, const void *vbuf, Size_t count)
114 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
115 char *dst = SvGROW(s->var,s->posn+count);
116 Move(vbuf,dst+s->posn,count,char);
118 SvCUR_set(s->var,s->posn);
124 PerlIOScalar_write(PerlIO *f, const void *vbuf, Size_t count)
126 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
130 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
133 if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
135 dst = SvGROW(sv,SvCUR(sv)+count);
137 s->posn = offset+count;
141 if ((s->posn+count) > SvCUR(sv))
142 dst = SvGROW(sv,s->posn+count);
144 dst = SvPV_nolen(sv);
148 Move(vbuf,dst+offset,count,char);
149 if (s->posn > SvCUR(sv))
150 SvCUR_set(sv,s->posn);
159 PerlIOScalar_fill(PerlIO *f)
165 PerlIOScalar_flush(PerlIO *f)
171 PerlIOScalar_get_base(PerlIO *f)
173 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
174 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
177 return (STDCHAR *)SvPV_nolen(s->var);
179 return (STDCHAR *) Nullch;
183 PerlIOScalar_get_ptr(PerlIO *f)
185 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
187 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
188 return PerlIOScalar_get_base(f)+s->posn;
190 return (STDCHAR *) Nullch;
194 PerlIOScalar_get_cnt(PerlIO *f)
196 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
198 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
199 if (SvCUR(s->var) > s->posn)
200 return SvCUR(s->var) - s->posn;
208 PerlIOScalar_bufsiz(PerlIO *f)
210 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
212 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
213 return SvCUR(s->var);
219 PerlIOScalar_set_ptrcnt(PerlIO *f, STDCHAR *ptr, SSize_t cnt)
221 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
222 s->posn = SvCUR(s->var)-cnt;
226 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)
229 SV *arg = (narg > 0) ? *args : PerlIOArg;
230 if (SvROK(arg) || SvPOK(arg))
232 f = PerlIO_allocate(aTHX);
233 s = PerlIOSelf(PerlIO_push(aTHX_ f,self,mode,arg),PerlIOScalar);
234 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
241 PerlIO_funcs PerlIO_scalar = {
243 sizeof(PerlIOScalar),
261 PerlIOBase_setlinebuf,
262 PerlIOScalar_get_base,
264 PerlIOScalar_get_ptr,
265 PerlIOScalar_get_cnt,
266 PerlIOScalar_set_ptrcnt,
270 #endif /* Layers available */
272 MODULE = PerlIO::Scalar PACKAGE = PerlIO::Scalar
279 PerlIO_define_layer(aTHX_ &PerlIO_scalar);