1 #define PERL_NO_GET_CONTEXT
9 static const char code_point_warning[] =
10 "Strings with code points over 0xFF may not be mapped into in-memory file handles\n";
13 struct _PerlIO base; /* Base "class" info */
19 PerlIOScalar_pushed(pTHX_ PerlIO * f, const char *mode, SV * arg,
23 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
24 /* If called (normally) via open() then arg is ref to scalar we are
25 * using, otherwise arg (from binmode presumably) is either NULL
26 * or the _name_ of the scalar
28 if (arg && SvOK(arg)) {
30 if (SvREADONLY(SvRV(arg)) && !SvIsCOW(SvRV(arg))
31 && mode && *mode != 'r') {
32 if (ckWARN(WARN_LAYER))
33 Perl_warner(aTHX_ packWARN(WARN_LAYER), "%s", PL_no_modify);
34 SETERRNO(EINVAL, SS_IVCHAN);
37 s->var = SvREFCNT_inc(SvRV(arg));
39 if (!SvPOK(s->var) && SvOK(s->var))
40 (void)SvPV_nomg_const_nolen(s->var);
44 SvREFCNT_inc(perl_get_sv
45 (SvPV_nolen(arg), GV_ADD | GV_ADDMULTI));
49 s->var = newSVpvn("", 0);
51 SvUPGRADE(s->var, SVt_PV);
52 code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab);
53 if (!SvOK(s->var) || (PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE)
55 sv_force_normal(s->var);
58 if (SvUTF8(s->var) && !sv_utf8_downgrade(s->var, TRUE)) {
59 if (ckWARN(WARN_UTF8))
60 Perl_warner(aTHX_ packWARN(WARN_UTF8), code_point_warning);
61 SETERRNO(EINVAL, SS_IVCHAN);
66 if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND)
68 sv_force_normal(s->var);
69 s->posn = SvCUR(s->var);
78 PerlIOScalar_popped(pTHX_ PerlIO * f)
80 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
89 PerlIOScalar_close(pTHX_ PerlIO * f)
91 IV code = PerlIOBase_close(aTHX_ f);
92 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF);
97 PerlIOScalar_fileno(pTHX_ PerlIO * f)
104 PerlIOScalar_seek(pTHX_ PerlIO * f, Off_t offset, int whence)
106 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
113 s->posn = offset + s->posn;
118 (void)SvPV(s->var, oldcur);
119 s->posn = offset + oldcur;
124 if (ckWARN(WARN_LAYER))
125 Perl_warner(aTHX_ packWARN(WARN_LAYER), "Offset outside string");
126 SETERRNO(EINVAL, SS_IVCHAN);
133 PerlIOScalar_tell(pTHX_ PerlIO * f)
135 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
141 PerlIOScalar_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
145 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
146 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
147 SETERRNO(EBADF, SS_IVCHAN);
151 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
158 if (sv_utf8_downgrade(sv, TRUE)) {
159 p = SvPV_nomg(sv, len);
162 if (ckWARN(WARN_UTF8))
163 Perl_warner(aTHX_ packWARN(WARN_UTF8), code_point_warning);
164 SETERRNO(EINVAL, SS_IVCHAN);
168 got = len - (STRLEN)(s->posn);
171 if ((STRLEN)got > (STRLEN)count)
173 Copy(p + (STRLEN)(s->posn), vbuf, got, STDCHAR);
174 s->posn += (Off_t)got;
180 PerlIOScalar_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count)
182 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
184 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
188 if (!SvROK(sv)) sv_force_normal(sv);
189 if (SvOK(sv)) SvPV_force_nomg_nolen(sv);
190 if (SvUTF8(sv) && !sv_utf8_downgrade(sv, TRUE)) {
191 if (ckWARN(WARN_UTF8))
192 Perl_warner(aTHX_ packWARN(WARN_UTF8), code_point_warning);
193 SETERRNO(EINVAL, SS_IVCHAN);
196 if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) {
197 dst = SvGROW(sv, SvCUR(sv) + count + 1);
199 s->posn = offset + count;
202 STRLEN const cur = SvCUR(sv);
204 dst = SvGROW(sv, (STRLEN)s->posn + count + 1);
205 Zero(SvPVX(sv) + cur, (STRLEN)s->posn - cur, char);
207 else if ((s->posn + count) >= cur)
208 dst = SvGROW(sv, (STRLEN)s->posn + count + 1);
214 Move(vbuf, dst + offset, count, char);
215 if ((STRLEN) s->posn > SvCUR(sv)) {
216 SvCUR_set(sv, (STRLEN)s->posn);
217 dst[(STRLEN) s->posn] = 0;
228 PerlIOScalar_fill(pTHX_ PerlIO * f)
235 PerlIOScalar_flush(pTHX_ PerlIO * f)
242 PerlIOScalar_get_base(pTHX_ PerlIO * f)
244 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
245 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
247 return (STDCHAR *) SvPV_nolen(s->var);
249 return (STDCHAR *) NULL;
253 PerlIOScalar_get_ptr(pTHX_ PerlIO * f)
255 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
256 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
257 return PerlIOScalar_get_base(aTHX_ f) + s->posn;
259 return (STDCHAR *) NULL;
263 PerlIOScalar_get_cnt(pTHX_ PerlIO * f)
265 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
266 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
269 if (isGV_with_GP(s->var))
270 (void)SvPV(s->var,len);
271 else len = SvCUR(s->var);
272 if (len > (STRLEN) s->posn)
273 return len - (STRLEN)s->posn;
281 PerlIOScalar_bufsiz(pTHX_ PerlIO * f)
283 if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) {
284 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
286 return SvCUR(s->var);
292 PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt)
294 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
296 PERL_UNUSED_ARG(ptr);
298 if (isGV_with_GP(s->var)) (void)SvPV(s->var,len);
299 else len = SvCUR(s->var);
304 PerlIOScalar_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers, IV n,
305 const char *mode, int fd, int imode, int perm,
306 PerlIO * f, int narg, SV ** args)
308 SV *arg = (narg > 0) ? *args : PerlIOArg;
310 PERL_UNUSED_ARG(imode);
311 PERL_UNUSED_ARG(perm);
312 if (SvROK(arg) || SvPOK(arg)) {
314 f = PerlIO_allocate(aTHX);
316 if ( (f = PerlIO_push(aTHX_ f, self, mode, arg)) ) {
317 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
325 PerlIOScalar_arg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags)
327 PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar);
329 if (flags & PERLIO_DUP_CLONE)
330 var = PerlIO_sv_dup(aTHX_ var, param);
331 else if (flags & PERLIO_DUP_FD) {
332 /* Equivalent (guesses NI-S) of dup() is to create a new scalar */
336 var = SvREFCNT_inc(var);
338 return newRV_noinc(var);
342 PerlIOScalar_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param,
345 /* Duplication causes the scalar layer to be pushed on to clone, caus-
346 ing the cloned scalar to be set to the empty string by
347 PerlIOScalar_pushed. So set aside our scalar temporarily. */
348 PerlIOScalar * const os = PerlIOSelf(o, PerlIOScalar);
350 SV * const var = os->var;
351 os->var = newSVpvs("");
352 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
353 fs = PerlIOSelf(f, PerlIOScalar);
354 /* var has been set by implicit push, so replace it */
355 SvREFCNT_dec(fs->var);
357 SvREFCNT_dec(os->var);
360 SV * const rv = PerlIOScalar_arg(aTHX_ o, param, flags);
361 fs->var = SvREFCNT_inc(SvRV(rv));
368 PERLIO_FUNCS_DECL(PerlIO_scalar) = {
369 sizeof(PerlIO_funcs),
371 sizeof(PerlIOScalar),
372 PERLIO_K_BUFFERED | PERLIO_K_RAW,
391 PerlIOBase_setlinebuf,
392 PerlIOScalar_get_base,
394 PerlIOScalar_get_ptr,
395 PerlIOScalar_get_cnt,
396 PerlIOScalar_set_ptrcnt,
400 #endif /* Layers available */
402 MODULE = PerlIO::scalar PACKAGE = PerlIO::scalar
409 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_scalar));