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)
69 IV code = PerlIOBase_close(f);
70 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF|PERLIO_F_WRBUF);
75 PerlIOScalar_fileno(PerlIO *f)
81 PerlIOScalar_seek(PerlIO *f, Off_t offset, int whence)
83 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
90 s->posn = offset + s->posn;
93 s->posn = offset + SvCUR(s->var);
96 if (s->posn > SvCUR(s->var))
99 (void) SvGROW(s->var,s->posn);
105 PerlIOScalar_tell(PerlIO *f)
107 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
112 PerlIOScalar_unread(PerlIO *f, const void *vbuf, Size_t count)
115 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
116 char *dst = SvGROW(s->var,s->posn+count);
117 Move(vbuf,dst+s->posn,count,char);
119 SvCUR_set(s->var,s->posn);
125 PerlIOScalar_write(PerlIO *f, const void *vbuf, Size_t count)
127 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
131 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
134 if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
136 dst = SvGROW(sv,SvCUR(sv)+count);
138 s->posn = offset+count;
142 if ((s->posn+count) > SvCUR(sv))
143 dst = SvGROW(sv,s->posn+count);
145 dst = SvPV_nolen(sv);
149 Move(vbuf,dst+offset,count,char);
150 if (s->posn > SvCUR(sv))
151 SvCUR_set(sv,s->posn);
160 PerlIOScalar_fill(PerlIO *f)
166 PerlIOScalar_flush(PerlIO *f)
172 PerlIOScalar_get_base(PerlIO *f)
174 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
175 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
178 return (STDCHAR *)SvPV_nolen(s->var);
180 return (STDCHAR *) Nullch;
184 PerlIOScalar_get_ptr(PerlIO *f)
186 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
188 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
189 return PerlIOScalar_get_base(f)+s->posn;
191 return (STDCHAR *) Nullch;
195 PerlIOScalar_get_cnt(PerlIO *f)
197 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
199 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
200 if (SvCUR(s->var) > s->posn)
201 return SvCUR(s->var) - s->posn;
209 PerlIOScalar_bufsiz(PerlIO *f)
211 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
213 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
214 return SvCUR(s->var);
220 PerlIOScalar_set_ptrcnt(PerlIO *f, STDCHAR *ptr, SSize_t cnt)
222 PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
223 s->posn = SvCUR(s->var)-cnt;
227 PerlIOScalar_open(pTHX_ PerlIO_funcs *self, AV *layers, IV n, const char *mode, int fd, int imode, int perm, PerlIO *f, int narg, SV **args)
230 SV *arg = (narg > 0) ? *args : PerlIOArg;
231 if (SvROK(arg) || SvPOK(arg))
233 f = PerlIO_allocate(aTHX);
234 s = PerlIOSelf(PerlIO_push(aTHX_ f,self,mode,arg),PerlIOScalar);
235 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
242 PerlIO_funcs PerlIO_scalar = {
244 sizeof(PerlIOScalar),
262 PerlIOBase_setlinebuf,
263 PerlIOScalar_get_base,
265 PerlIOScalar_get_ptr,
266 PerlIOScalar_get_cnt,
267 PerlIOScalar_set_ptrcnt,
271 #endif /* Layers available */
273 MODULE = PerlIO::Scalar PACKAGE = PerlIO::Scalar
280 PerlIO_define_layer(aTHX_ &PerlIO_scalar);