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f6c77cf1 |
1 | #define PERL_NO_GET_CONTEXT |
2 | #include "EXTERN.h" |
3 | #include "perl.h" |
4 | #include "XSUB.h" |
5 | #ifdef PERLIO_LAYERS |
6 | |
7 | #include "perliol.h" |
8 | |
14d89041 |
9 | typedef struct { |
10 | struct _PerlIO base; /* Base "class" info */ |
11 | SV *var; |
12 | Off_t posn; |
f6c77cf1 |
13 | } PerlIOScalar; |
14 | |
15 | IV |
14d89041 |
16 | PerlIOScalar_pushed(pTHX_ PerlIO * f, const char *mode, SV * arg, |
17 | PerlIO_funcs * tab) |
f6c77cf1 |
18 | { |
14d89041 |
19 | IV code; |
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 |
24 | */ |
25 | if (arg) { |
cba44c14 |
26 | if (SvROK(arg)) { |
b35bc0c6 |
27 | if (SvREADONLY(SvRV(arg)) && mode && *mode != 'r') { |
28 | if (ckWARN(WARN_LAYER)) |
29 | Perl_warner(aTHX_ packWARN(WARN_LAYER), PL_no_modify); |
42bc49da |
30 | SETERRNO(EINVAL, SS_IVCHAN); |
b35bc0c6 |
31 | return -1; |
32 | } |
14d89041 |
33 | s->var = SvREFCNT_inc(SvRV(arg)); |
03aa69f9 |
34 | if (!SvPOK(s->var) && SvTYPE(SvRV(arg)) > SVt_NULL) |
34fcc551 |
35 | (void)SvPV_nolen(s->var); |
14d89041 |
36 | } |
37 | else { |
38 | s->var = |
39 | SvREFCNT_inc(perl_get_sv |
40 | (SvPV_nolen(arg), GV_ADD | GV_ADDMULTI)); |
41 | } |
564dc057 |
42 | } |
14d89041 |
43 | else { |
44 | s->var = newSVpvn("", 0); |
564dc057 |
45 | } |
c5b94a97 |
46 | SvUPGRADE(s->var, SVt_PV); |
14d89041 |
47 | code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab); |
47cc46ee |
48 | if (!SvOK(s->var) || (PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE) |
b162af07 |
49 | SvCUR_set(s->var, 0); |
14d89041 |
50 | if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) |
51 | s->posn = SvCUR(s->var); |
52 | else |
53 | s->posn = 0; |
54 | return code; |
f6c77cf1 |
55 | } |
56 | |
57 | IV |
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58 | PerlIOScalar_popped(pTHX_ PerlIO * f) |
f6c77cf1 |
59 | { |
14d89041 |
60 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
61 | if (s->var) { |
62 | SvREFCNT_dec(s->var); |
63 | s->var = Nullsv; |
64 | } |
65 | return 0; |
f6c77cf1 |
66 | } |
67 | |
68 | IV |
14d89041 |
69 | PerlIOScalar_close(pTHX_ PerlIO * f) |
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70 | { |
14d89041 |
71 | IV code = PerlIOBase_close(aTHX_ f); |
72 | PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF); |
73 | return code; |
f6c77cf1 |
74 | } |
75 | |
76 | IV |
14d89041 |
77 | PerlIOScalar_fileno(pTHX_ PerlIO * f) |
f6c77cf1 |
78 | { |
14d89041 |
79 | return -1; |
f6c77cf1 |
80 | } |
81 | |
82 | IV |
14d89041 |
83 | PerlIOScalar_seek(pTHX_ PerlIO * f, Off_t offset, int whence) |
f6c77cf1 |
84 | { |
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85 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
42bc49da |
86 | STRLEN oldcur = SvCUR(s->var); |
87 | STRLEN newlen; |
14d89041 |
88 | switch (whence) { |
42bc49da |
89 | case SEEK_SET: |
14d89041 |
90 | s->posn = offset; |
91 | break; |
42bc49da |
92 | case SEEK_CUR: |
14d89041 |
93 | s->posn = offset + s->posn; |
94 | break; |
42bc49da |
95 | case SEEK_END: |
14d89041 |
96 | s->posn = offset + SvCUR(s->var); |
97 | break; |
98 | } |
42bc49da |
99 | if (s->posn < 0) { |
100 | if (ckWARN(WARN_LAYER)) |
101 | Perl_warner(aTHX_ packWARN(WARN_LAYER), "Offset outside string"); |
102 | SETERRNO(EINVAL, SS_IVCHAN); |
103 | return -1; |
14d89041 |
104 | } |
42bc49da |
105 | newlen = (STRLEN) s->posn; |
106 | if (newlen > oldcur) { |
107 | (void) SvGROW(s->var, newlen); |
108 | Zero(SvPVX(s->var) + oldcur, newlen - oldcur, char); |
109 | /* No SvCUR_set(), though. This is just a seek, not a write. */ |
110 | } |
8b8eea96 |
111 | else if (!SvPVX(s->var)) { |
112 | /* ensure there's always a character buffer */ |
113 | (void)SvGROW(s->var,1); |
114 | } |
42bc49da |
115 | SvPOK_on(s->var); |
14d89041 |
116 | return 0; |
f6c77cf1 |
117 | } |
118 | |
119 | Off_t |
14d89041 |
120 | PerlIOScalar_tell(pTHX_ PerlIO * f) |
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121 | { |
14d89041 |
122 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
123 | return s->posn; |
f6c77cf1 |
124 | } |
125 | |
126 | SSize_t |
14d89041 |
127 | PerlIOScalar_unread(pTHX_ PerlIO * f, const void *vbuf, Size_t count) |
f6c77cf1 |
128 | { |
14d89041 |
129 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
4a9d6100 |
130 | char *dst = SvGROW(s->var, (STRLEN)s->posn + count); |
5735c168 |
131 | s->posn -= count; |
14d89041 |
132 | Move(vbuf, dst + s->posn, count, char); |
14d89041 |
133 | SvPOK_on(s->var); |
134 | return count; |
f6c77cf1 |
135 | } |
136 | |
137 | SSize_t |
14d89041 |
138 | PerlIOScalar_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count) |
f6c77cf1 |
139 | { |
14d89041 |
140 | if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) { |
141 | Off_t offset; |
142 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
143 | SV *sv = s->var; |
144 | char *dst; |
145 | if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) { |
146 | dst = SvGROW(sv, SvCUR(sv) + count); |
147 | offset = SvCUR(sv); |
148 | s->posn = offset + count; |
149 | } |
150 | else { |
151 | if ((s->posn + count) > SvCUR(sv)) |
4a9d6100 |
152 | dst = SvGROW(sv, (STRLEN)s->posn + count); |
14d89041 |
153 | else |
154 | dst = SvPV_nolen(sv); |
155 | offset = s->posn; |
156 | s->posn += count; |
157 | } |
158 | Move(vbuf, dst + offset, count, char); |
159 | if ((STRLEN) s->posn > SvCUR(sv)) |
4a9d6100 |
160 | SvCUR_set(sv, (STRLEN)s->posn); |
14d89041 |
161 | SvPOK_on(s->var); |
162 | return count; |
09bf542c |
163 | } |
14d89041 |
164 | else |
165 | return 0; |
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166 | } |
167 | |
168 | IV |
14d89041 |
169 | PerlIOScalar_fill(pTHX_ PerlIO * f) |
f6c77cf1 |
170 | { |
14d89041 |
171 | return -1; |
f6c77cf1 |
172 | } |
173 | |
174 | IV |
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175 | PerlIOScalar_flush(pTHX_ PerlIO * f) |
f6c77cf1 |
176 | { |
14d89041 |
177 | return 0; |
f6c77cf1 |
178 | } |
179 | |
180 | STDCHAR * |
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181 | PerlIOScalar_get_base(pTHX_ PerlIO * f) |
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182 | { |
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183 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
184 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
185 | return (STDCHAR *) SvPV_nolen(s->var); |
186 | } |
187 | return (STDCHAR *) Nullch; |
f6c77cf1 |
188 | } |
189 | |
190 | STDCHAR * |
14d89041 |
191 | PerlIOScalar_get_ptr(pTHX_ PerlIO * f) |
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192 | { |
14d89041 |
193 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
194 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
195 | return PerlIOScalar_get_base(aTHX_ f) + s->posn; |
196 | } |
197 | return (STDCHAR *) Nullch; |
f6c77cf1 |
198 | } |
199 | |
200 | SSize_t |
14d89041 |
201 | PerlIOScalar_get_cnt(pTHX_ PerlIO * f) |
f6c77cf1 |
202 | { |
14d89041 |
203 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
204 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
205 | if (SvCUR(s->var) > (STRLEN) s->posn) |
4a9d6100 |
206 | return SvCUR(s->var) - (STRLEN)s->posn; |
14d89041 |
207 | else |
208 | return 0; |
209 | } |
75effbe0 |
210 | return 0; |
f6c77cf1 |
211 | } |
212 | |
213 | Size_t |
14d89041 |
214 | PerlIOScalar_bufsiz(pTHX_ PerlIO * f) |
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215 | { |
14d89041 |
216 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
217 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
218 | return SvCUR(s->var); |
219 | } |
220 | return 0; |
f6c77cf1 |
221 | } |
222 | |
223 | void |
14d89041 |
224 | PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt) |
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225 | { |
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226 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
227 | s->posn = SvCUR(s->var) - cnt; |
f6c77cf1 |
228 | } |
229 | |
230 | PerlIO * |
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231 | PerlIOScalar_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers, IV n, |
232 | const char *mode, int fd, int imode, int perm, |
233 | PerlIO * f, int narg, SV ** args) |
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234 | { |
14d89041 |
235 | SV *arg = (narg > 0) ? *args : PerlIOArg; |
236 | if (SvROK(arg) || SvPOK(arg)) { |
237 | if (!f) { |
238 | f = PerlIO_allocate(aTHX); |
239 | } |
e3feee4e |
240 | if ( (f = PerlIO_push(aTHX_ f, self, mode, arg)) ) { |
14d89041 |
241 | PerlIOBase(f)->flags |= PERLIO_F_OPEN; |
242 | } |
243 | return f; |
244 | } |
245 | return NULL; |
f6c77cf1 |
246 | } |
247 | |
ecdeb87c |
248 | SV * |
14d89041 |
249 | PerlIOScalar_arg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags) |
ecdeb87c |
250 | { |
14d89041 |
251 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
252 | SV *var = s->var; |
253 | if (flags & PERLIO_DUP_CLONE) |
254 | var = PerlIO_sv_dup(aTHX_ var, param); |
255 | else if (flags & PERLIO_DUP_FD) { |
256 | /* Equivalent (guesses NI-S) of dup() is to create a new scalar */ |
257 | var = newSVsv(var); |
258 | } |
259 | else { |
260 | var = SvREFCNT_inc(var); |
261 | } |
262 | return newRV_noinc(var); |
ecdeb87c |
263 | } |
264 | |
8cf8f3d1 |
265 | PerlIO * |
14d89041 |
266 | PerlIOScalar_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param, |
267 | int flags) |
8cf8f3d1 |
268 | { |
14d89041 |
269 | if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) { |
270 | PerlIOScalar *fs = PerlIOSelf(f, PerlIOScalar); |
271 | PerlIOScalar *os = PerlIOSelf(o, PerlIOScalar); |
272 | /* var has been set by implicit push */ |
273 | fs->posn = os->posn; |
274 | } |
275 | return f; |
8cf8f3d1 |
276 | } |
f6c77cf1 |
277 | |
27da23d5 |
278 | PERLIO_FUNCS_DECL(PerlIO_scalar) = { |
14d89041 |
279 | sizeof(PerlIO_funcs), |
280 | "scalar", |
281 | sizeof(PerlIOScalar), |
282 | PERLIO_K_BUFFERED | PERLIO_K_RAW, |
283 | PerlIOScalar_pushed, |
284 | PerlIOScalar_popped, |
285 | PerlIOScalar_open, |
286 | PerlIOBase_binmode, |
287 | PerlIOScalar_arg, |
288 | PerlIOScalar_fileno, |
289 | PerlIOScalar_dup, |
290 | PerlIOBase_read, |
291 | PerlIOScalar_unread, |
292 | PerlIOScalar_write, |
293 | PerlIOScalar_seek, |
294 | PerlIOScalar_tell, |
295 | PerlIOScalar_close, |
296 | PerlIOScalar_flush, |
297 | PerlIOScalar_fill, |
298 | PerlIOBase_eof, |
299 | PerlIOBase_error, |
300 | PerlIOBase_clearerr, |
301 | PerlIOBase_setlinebuf, |
302 | PerlIOScalar_get_base, |
303 | PerlIOScalar_bufsiz, |
304 | PerlIOScalar_get_ptr, |
305 | PerlIOScalar_get_cnt, |
306 | PerlIOScalar_set_ptrcnt, |
f6c77cf1 |
307 | }; |
308 | |
309 | |
310 | #endif /* Layers available */ |
311 | |
e934609f |
312 | MODULE = PerlIO::scalar PACKAGE = PerlIO::scalar |
f6c77cf1 |
313 | |
acf4de66 |
314 | PROTOTYPES: ENABLE |
315 | |
f6c77cf1 |
316 | BOOT: |
317 | { |
318 | #ifdef PERLIO_LAYERS |
27da23d5 |
319 | PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_scalar)); |
f6c77cf1 |
320 | #endif |
321 | } |
322 | |