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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)) |
76c6a213 |
29 | Perl_warner(aTHX_ packWARN(WARN_LAYER), "%s", PL_no_modify); |
42bc49da |
30 | SETERRNO(EINVAL, SS_IVCHAN); |
b35bc0c6 |
31 | return -1; |
32 | } |
14d89041 |
33 | s->var = SvREFCNT_inc(SvRV(arg)); |
22ccb26d |
34 | SvGETMAGIC(s->var); |
35 | if (!SvPOK(s->var) && SvOK(s->var)) |
36 | (void)SvPV_nomg_const_nolen(s->var); |
14d89041 |
37 | } |
38 | else { |
39 | s->var = |
40 | SvREFCNT_inc(perl_get_sv |
41 | (SvPV_nolen(arg), GV_ADD | GV_ADDMULTI)); |
42 | } |
564dc057 |
43 | } |
14d89041 |
44 | else { |
45 | s->var = newSVpvn("", 0); |
564dc057 |
46 | } |
c5b94a97 |
47 | SvUPGRADE(s->var, SVt_PV); |
14d89041 |
48 | code = PerlIOBase_pushed(aTHX_ f, mode, Nullsv, tab); |
47cc46ee |
49 | if (!SvOK(s->var) || (PerlIOBase(f)->flags) & PERLIO_F_TRUNCATE) |
b162af07 |
50 | SvCUR_set(s->var, 0); |
14d89041 |
51 | if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) |
52 | s->posn = SvCUR(s->var); |
53 | else |
54 | s->posn = 0; |
55 | return code; |
f6c77cf1 |
56 | } |
57 | |
58 | IV |
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59 | PerlIOScalar_popped(pTHX_ PerlIO * f) |
f6c77cf1 |
60 | { |
14d89041 |
61 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
62 | if (s->var) { |
63 | SvREFCNT_dec(s->var); |
64 | s->var = Nullsv; |
65 | } |
66 | return 0; |
f6c77cf1 |
67 | } |
68 | |
69 | IV |
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70 | PerlIOScalar_close(pTHX_ PerlIO * f) |
f6c77cf1 |
71 | { |
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72 | IV code = PerlIOBase_close(aTHX_ f); |
73 | PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF); |
74 | return code; |
f6c77cf1 |
75 | } |
76 | |
77 | IV |
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78 | PerlIOScalar_fileno(pTHX_ PerlIO * f) |
f6c77cf1 |
79 | { |
14d89041 |
80 | return -1; |
f6c77cf1 |
81 | } |
82 | |
83 | IV |
14d89041 |
84 | PerlIOScalar_seek(pTHX_ PerlIO * f, Off_t offset, int whence) |
f6c77cf1 |
85 | { |
14d89041 |
86 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
42bc49da |
87 | STRLEN oldcur = SvCUR(s->var); |
88 | STRLEN newlen; |
14d89041 |
89 | switch (whence) { |
42bc49da |
90 | case SEEK_SET: |
14d89041 |
91 | s->posn = offset; |
92 | break; |
42bc49da |
93 | case SEEK_CUR: |
14d89041 |
94 | s->posn = offset + s->posn; |
95 | break; |
42bc49da |
96 | case SEEK_END: |
14d89041 |
97 | s->posn = offset + SvCUR(s->var); |
98 | break; |
99 | } |
42bc49da |
100 | if (s->posn < 0) { |
101 | if (ckWARN(WARN_LAYER)) |
102 | Perl_warner(aTHX_ packWARN(WARN_LAYER), "Offset outside string"); |
103 | SETERRNO(EINVAL, SS_IVCHAN); |
104 | return -1; |
14d89041 |
105 | } |
42bc49da |
106 | newlen = (STRLEN) s->posn; |
107 | if (newlen > oldcur) { |
108 | (void) SvGROW(s->var, newlen); |
109 | Zero(SvPVX(s->var) + oldcur, newlen - oldcur, char); |
110 | /* No SvCUR_set(), though. This is just a seek, not a write. */ |
111 | } |
8b8eea96 |
112 | else if (!SvPVX(s->var)) { |
113 | /* ensure there's always a character buffer */ |
114 | (void)SvGROW(s->var,1); |
115 | } |
42bc49da |
116 | SvPOK_on(s->var); |
14d89041 |
117 | return 0; |
f6c77cf1 |
118 | } |
119 | |
120 | Off_t |
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121 | PerlIOScalar_tell(pTHX_ PerlIO * f) |
f6c77cf1 |
122 | { |
14d89041 |
123 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
124 | return s->posn; |
f6c77cf1 |
125 | } |
126 | |
127 | SSize_t |
14d89041 |
128 | PerlIOScalar_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count) |
f6c77cf1 |
129 | { |
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130 | if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) { |
131 | Off_t offset; |
132 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
133 | SV *sv = s->var; |
134 | char *dst; |
135 | if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) { |
136 | dst = SvGROW(sv, SvCUR(sv) + count); |
137 | offset = SvCUR(sv); |
138 | s->posn = offset + count; |
139 | } |
140 | else { |
141 | if ((s->posn + count) > SvCUR(sv)) |
4a9d6100 |
142 | dst = SvGROW(sv, (STRLEN)s->posn + count); |
14d89041 |
143 | else |
144 | dst = SvPV_nolen(sv); |
145 | offset = s->posn; |
146 | s->posn += count; |
147 | } |
148 | Move(vbuf, dst + offset, count, char); |
149 | if ((STRLEN) s->posn > SvCUR(sv)) |
4a9d6100 |
150 | SvCUR_set(sv, (STRLEN)s->posn); |
14d89041 |
151 | SvPOK_on(s->var); |
152 | return count; |
09bf542c |
153 | } |
14d89041 |
154 | else |
155 | return 0; |
f6c77cf1 |
156 | } |
157 | |
158 | IV |
14d89041 |
159 | PerlIOScalar_fill(pTHX_ PerlIO * f) |
f6c77cf1 |
160 | { |
14d89041 |
161 | return -1; |
f6c77cf1 |
162 | } |
163 | |
164 | IV |
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165 | PerlIOScalar_flush(pTHX_ PerlIO * f) |
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166 | { |
14d89041 |
167 | return 0; |
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168 | } |
169 | |
170 | STDCHAR * |
14d89041 |
171 | PerlIOScalar_get_base(pTHX_ PerlIO * f) |
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172 | { |
14d89041 |
173 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
174 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
175 | return (STDCHAR *) SvPV_nolen(s->var); |
176 | } |
9849c14c |
177 | return (STDCHAR *) NULL; |
f6c77cf1 |
178 | } |
179 | |
180 | STDCHAR * |
14d89041 |
181 | PerlIOScalar_get_ptr(pTHX_ PerlIO * f) |
f6c77cf1 |
182 | { |
14d89041 |
183 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
184 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
185 | return PerlIOScalar_get_base(aTHX_ f) + s->posn; |
186 | } |
9849c14c |
187 | return (STDCHAR *) NULL; |
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188 | } |
189 | |
190 | SSize_t |
14d89041 |
191 | PerlIOScalar_get_cnt(pTHX_ PerlIO * f) |
f6c77cf1 |
192 | { |
14d89041 |
193 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
194 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
195 | if (SvCUR(s->var) > (STRLEN) s->posn) |
4a9d6100 |
196 | return SvCUR(s->var) - (STRLEN)s->posn; |
14d89041 |
197 | else |
198 | return 0; |
199 | } |
75effbe0 |
200 | return 0; |
f6c77cf1 |
201 | } |
202 | |
203 | Size_t |
14d89041 |
204 | PerlIOScalar_bufsiz(pTHX_ PerlIO * f) |
f6c77cf1 |
205 | { |
14d89041 |
206 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
207 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
208 | return SvCUR(s->var); |
209 | } |
210 | return 0; |
f6c77cf1 |
211 | } |
212 | |
213 | void |
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214 | PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt) |
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215 | { |
14d89041 |
216 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
217 | s->posn = SvCUR(s->var) - cnt; |
f6c77cf1 |
218 | } |
219 | |
220 | PerlIO * |
14d89041 |
221 | PerlIOScalar_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers, IV n, |
222 | const char *mode, int fd, int imode, int perm, |
223 | PerlIO * f, int narg, SV ** args) |
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224 | { |
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225 | SV *arg = (narg > 0) ? *args : PerlIOArg; |
226 | if (SvROK(arg) || SvPOK(arg)) { |
227 | if (!f) { |
228 | f = PerlIO_allocate(aTHX); |
229 | } |
e3feee4e |
230 | if ( (f = PerlIO_push(aTHX_ f, self, mode, arg)) ) { |
14d89041 |
231 | PerlIOBase(f)->flags |= PERLIO_F_OPEN; |
232 | } |
233 | return f; |
234 | } |
235 | return NULL; |
f6c77cf1 |
236 | } |
237 | |
ecdeb87c |
238 | SV * |
14d89041 |
239 | PerlIOScalar_arg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags) |
ecdeb87c |
240 | { |
14d89041 |
241 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
242 | SV *var = s->var; |
243 | if (flags & PERLIO_DUP_CLONE) |
244 | var = PerlIO_sv_dup(aTHX_ var, param); |
245 | else if (flags & PERLIO_DUP_FD) { |
246 | /* Equivalent (guesses NI-S) of dup() is to create a new scalar */ |
247 | var = newSVsv(var); |
248 | } |
249 | else { |
250 | var = SvREFCNT_inc(var); |
251 | } |
252 | return newRV_noinc(var); |
ecdeb87c |
253 | } |
254 | |
8cf8f3d1 |
255 | PerlIO * |
14d89041 |
256 | PerlIOScalar_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param, |
257 | int flags) |
8cf8f3d1 |
258 | { |
14d89041 |
259 | if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) { |
260 | PerlIOScalar *fs = PerlIOSelf(f, PerlIOScalar); |
261 | PerlIOScalar *os = PerlIOSelf(o, PerlIOScalar); |
262 | /* var has been set by implicit push */ |
263 | fs->posn = os->posn; |
264 | } |
265 | return f; |
8cf8f3d1 |
266 | } |
f6c77cf1 |
267 | |
27da23d5 |
268 | PERLIO_FUNCS_DECL(PerlIO_scalar) = { |
14d89041 |
269 | sizeof(PerlIO_funcs), |
270 | "scalar", |
271 | sizeof(PerlIOScalar), |
272 | PERLIO_K_BUFFERED | PERLIO_K_RAW, |
273 | PerlIOScalar_pushed, |
274 | PerlIOScalar_popped, |
275 | PerlIOScalar_open, |
276 | PerlIOBase_binmode, |
277 | PerlIOScalar_arg, |
278 | PerlIOScalar_fileno, |
279 | PerlIOScalar_dup, |
280 | PerlIOBase_read, |
3ff3a8b6 |
281 | NULL, /* unread */ |
14d89041 |
282 | PerlIOScalar_write, |
283 | PerlIOScalar_seek, |
284 | PerlIOScalar_tell, |
285 | PerlIOScalar_close, |
286 | PerlIOScalar_flush, |
287 | PerlIOScalar_fill, |
288 | PerlIOBase_eof, |
289 | PerlIOBase_error, |
290 | PerlIOBase_clearerr, |
291 | PerlIOBase_setlinebuf, |
292 | PerlIOScalar_get_base, |
293 | PerlIOScalar_bufsiz, |
294 | PerlIOScalar_get_ptr, |
295 | PerlIOScalar_get_cnt, |
296 | PerlIOScalar_set_ptrcnt, |
f6c77cf1 |
297 | }; |
298 | |
299 | |
300 | #endif /* Layers available */ |
301 | |
e934609f |
302 | MODULE = PerlIO::scalar PACKAGE = PerlIO::scalar |
f6c77cf1 |
303 | |
acf4de66 |
304 | PROTOTYPES: ENABLE |
305 | |
f6c77cf1 |
306 | BOOT: |
307 | { |
308 | #ifdef PERLIO_LAYERS |
27da23d5 |
309 | PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_scalar)); |
f6c77cf1 |
310 | #endif |
311 | } |
312 | |