1 #define PERL_NO_GET_CONTEXT
10 struct _PerlIO base; /* Base "class" info */
16 PerlIOScalar_pushed(pTHX_ PerlIO * f, const char *mode, SV * arg,
20 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
21 /* If called (normally) via open() then arg is ref to scalar we are
22 * using, otherwise arg (from binmode presumably) is either NULL
23 * or the _name_ of the scalar
27 if (SvREADONLY(SvRV(arg)) && mode && *mode != 'r') {
28 if (ckWARN(WARN_LAYER))
29 Perl_warner(aTHX_ packWARN(WARN_LAYER), "%s", PL_no_modify);
30 SETERRNO(EINVAL, SS_IVCHAN);
33 s->var = SvREFCNT_inc(SvRV(arg));
35 if (!SvPOK(s->var) && SvOK(s->var))
36 (void)SvPV_nomg_const_nolen(s->var);
40 SvREFCNT_inc(perl_get_sv
41 (SvPV_nolen(arg), GV_ADD | GV_ADDMULTI));
45 s->var = newSVpvn("", 0);
47 SvUPGRADE(s->var, SVt_PV);
48 code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab);
49 if (!SvOK(s->var) || (PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE)
51 if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
52 s->posn = SvCUR(s->var);
60 PerlIOScalar_popped(pTHX_ PerlIO * f)
62 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
71 PerlIOScalar_close(pTHX_ PerlIO * f)
73 IV code = PerlIOBase_close(aTHX_ f);
74 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF);
79 PerlIOScalar_fileno(pTHX_ PerlIO * f)
85 PerlIOScalar_seek(pTHX_ PerlIO * f, Off_t offset, int whence)
87 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
92 oldcur = SvCUR(s->var);
99 s->posn = offset + s->posn;
102 s->posn = offset + SvCUR(s->var);
106 if (ckWARN(WARN_LAYER))
107 Perl_warner(aTHX_ packWARN(WARN_LAYER), "Offset outside string");
108 SETERRNO(EINVAL, SS_IVCHAN);
111 newlen = (STRLEN) s->posn;
112 if (newlen > oldcur) {
113 (void) SvGROW(s->var, newlen);
114 Zero(SvPVX(s->var) + oldcur, newlen - oldcur, char);
115 /* No SvCUR_set(), though. This is just a seek, not a write. */
117 else if (!SvPVX(s->var)) {
118 /* ensure there's always a character buffer */
119 (void)SvGROW(s->var,1);
126 PerlIOScalar_tell(pTHX_ PerlIO * f)
128 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
134 PerlIOScalar_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
138 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
139 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
140 SETERRNO(EBADF, SS_IVCHAN);
144 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
149 got = len - (STRLEN)(s->posn);
152 if (got > (STRLEN)count)
154 Copy(p + (STRLEN)(s->posn), vbuf, got, STDCHAR);
155 s->posn += (Off_t)got;
161 PerlIOScalar_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
163 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
165 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
169 if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) {
170 dst = SvGROW(sv, SvCUR(sv) + count);
172 s->posn = offset + count;
175 if ((s->posn + count) > SvCUR(sv))
176 dst = SvGROW(sv, (STRLEN)s->posn + count);
182 Move(vbuf, dst + offset, count, char);
183 if ((STRLEN) s->posn > SvCUR(sv))
184 SvCUR_set(sv, (STRLEN)s->posn);
194 PerlIOScalar_fill(pTHX_ PerlIO * f)
200 PerlIOScalar_flush(pTHX_ PerlIO * f)
206 PerlIOScalar_get_base(pTHX_ PerlIO * f)
208 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
209 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
211 return (STDCHAR *) SvPV_nolen(s->var);
213 return (STDCHAR *) NULL;
217 PerlIOScalar_get_ptr(pTHX_ PerlIO * f)
219 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
220 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
221 return PerlIOScalar_get_base(aTHX_ f) + s->posn;
223 return (STDCHAR *) NULL;
227 PerlIOScalar_get_cnt(pTHX_ PerlIO * f)
229 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
230 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
232 if (SvCUR(s->var) > (STRLEN) s->posn)
233 return SvCUR(s->var) - (STRLEN)s->posn;
241 PerlIOScalar_bufsiz(pTHX_ PerlIO * f)
243 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
244 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
246 return SvCUR(s->var);
252 PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
254 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
256 s->posn = SvCUR(s->var) - cnt;
260 PerlIOScalar_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers, IV n,
261 const char *mode, int fd, int imode, int perm,
262 PerlIO * f, int narg, SV ** args)
264 SV *arg = (narg > 0) ? *args : PerlIOArg;
265 if (SvROK(arg) || SvPOK(arg)) {
267 f = PerlIO_allocate(aTHX);
269 if ( (f = PerlIO_push(aTHX_ f, self, mode, arg)) ) {
270 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
278 PerlIOScalar_arg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags)
280 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
282 if (flags & PERLIO_DUP_CLONE)
283 var = PerlIO_sv_dup(aTHX_ var, param);
284 else if (flags & PERLIO_DUP_FD) {
285 /* Equivalent (guesses NI-S) of dup() is to create a new scalar */
289 var = SvREFCNT_inc(var);
291 return newRV_noinc(var);
295 PerlIOScalar_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param,
298 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
299 PerlIOScalar *fs = PerlIOSelf(f, PerlIOScalar);
300 PerlIOScalar *os = PerlIOSelf(o, PerlIOScalar);
301 /* var has been set by implicit push */
307 PERLIO_FUNCS_DECL(PerlIO_scalar) = {
308 sizeof(PerlIO_funcs),
310 sizeof(PerlIOScalar),
311 PERLIO_K_BUFFERED | PERLIO_K_RAW,
330 PerlIOBase_setlinebuf,
331 PerlIOScalar_get_base,
333 PerlIOScalar_get_ptr,
334 PerlIOScalar_get_cnt,
335 PerlIOScalar_set_ptrcnt,
339 #endif /* Layers available */
341 MODULE = PerlIO::scalar PACKAGE = PerlIO::scalar
348 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_scalar));