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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 |
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16 | PerlIOScalar_pushed(pTHX_ PerlIO * f, const char *mode, SV * arg, |
17 | PerlIO_funcs * tab) |
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18 | { |
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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); |
30 | errno = EINVAL; |
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 | } |
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43 | else { |
44 | s->var = newSVpvn("", 0); |
564dc057 |
45 | } |
c5b94a97 |
46 | SvUPGRADE(s->var, SVt_PV); |
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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; |
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55 | } |
56 | |
57 | IV |
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58 | PerlIOScalar_popped(pTHX_ PerlIO * f) |
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59 | { |
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60 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
61 | if (s->var) { |
62 | SvREFCNT_dec(s->var); |
63 | s->var = Nullsv; |
64 | } |
65 | return 0; |
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66 | } |
67 | |
68 | IV |
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69 | PerlIOScalar_close(pTHX_ PerlIO * f) |
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70 | { |
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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 |
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77 | PerlIOScalar_fileno(pTHX_ PerlIO * f) |
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78 | { |
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79 | return -1; |
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80 | } |
81 | |
82 | IV |
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83 | PerlIOScalar_seek(pTHX_ PerlIO * f, Off_t offset, int whence) |
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84 | { |
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85 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
86 | switch (whence) { |
87 | case 0: |
88 | s->posn = offset; |
89 | break; |
90 | case 1: |
91 | s->posn = offset + s->posn; |
92 | break; |
93 | case 2: |
94 | s->posn = offset + SvCUR(s->var); |
95 | break; |
96 | } |
97 | if ((STRLEN) s->posn > SvCUR(s->var)) { |
98 | (void) SvGROW(s->var, (STRLEN) s->posn); |
99 | } |
100 | return 0; |
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101 | } |
102 | |
103 | Off_t |
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104 | PerlIOScalar_tell(pTHX_ PerlIO * f) |
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105 | { |
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106 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
107 | return s->posn; |
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108 | } |
109 | |
110 | SSize_t |
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111 | PerlIOScalar_unread(pTHX_ PerlIO * f, const void *vbuf, Size_t count) |
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112 | { |
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113 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
4a9d6100 |
114 | char *dst = SvGROW(s->var, (STRLEN)s->posn + count); |
5735c168 |
115 | s->posn -= count; |
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116 | Move(vbuf, dst + s->posn, count, char); |
14d89041 |
117 | SvPOK_on(s->var); |
118 | return count; |
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119 | } |
120 | |
121 | SSize_t |
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122 | PerlIOScalar_write(pTHX_ PerlIO * f, const void *vbuf, Size_t count) |
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123 | { |
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124 | if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) { |
125 | Off_t offset; |
126 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
127 | SV *sv = s->var; |
128 | char *dst; |
129 | if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) { |
130 | dst = SvGROW(sv, SvCUR(sv) + count); |
131 | offset = SvCUR(sv); |
132 | s->posn = offset + count; |
133 | } |
134 | else { |
135 | if ((s->posn + count) > SvCUR(sv)) |
4a9d6100 |
136 | dst = SvGROW(sv, (STRLEN)s->posn + count); |
14d89041 |
137 | else |
138 | dst = SvPV_nolen(sv); |
139 | offset = s->posn; |
140 | s->posn += count; |
141 | } |
142 | Move(vbuf, dst + offset, count, char); |
143 | if ((STRLEN) s->posn > SvCUR(sv)) |
4a9d6100 |
144 | SvCUR_set(sv, (STRLEN)s->posn); |
14d89041 |
145 | SvPOK_on(s->var); |
146 | return count; |
09bf542c |
147 | } |
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148 | else |
149 | return 0; |
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150 | } |
151 | |
152 | IV |
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153 | PerlIOScalar_fill(pTHX_ PerlIO * f) |
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154 | { |
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155 | return -1; |
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156 | } |
157 | |
158 | IV |
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159 | PerlIOScalar_flush(pTHX_ PerlIO * f) |
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160 | { |
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161 | return 0; |
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162 | } |
163 | |
164 | STDCHAR * |
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165 | PerlIOScalar_get_base(pTHX_ PerlIO * f) |
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166 | { |
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167 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
168 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
169 | return (STDCHAR *) SvPV_nolen(s->var); |
170 | } |
171 | return (STDCHAR *) Nullch; |
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172 | } |
173 | |
174 | STDCHAR * |
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175 | PerlIOScalar_get_ptr(pTHX_ PerlIO * f) |
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176 | { |
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177 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
178 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
179 | return PerlIOScalar_get_base(aTHX_ f) + s->posn; |
180 | } |
181 | return (STDCHAR *) Nullch; |
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182 | } |
183 | |
184 | SSize_t |
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185 | PerlIOScalar_get_cnt(pTHX_ PerlIO * f) |
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186 | { |
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187 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
188 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
189 | if (SvCUR(s->var) > (STRLEN) s->posn) |
4a9d6100 |
190 | return SvCUR(s->var) - (STRLEN)s->posn; |
14d89041 |
191 | else |
192 | return 0; |
193 | } |
75effbe0 |
194 | return 0; |
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195 | } |
196 | |
197 | Size_t |
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198 | PerlIOScalar_bufsiz(pTHX_ PerlIO * f) |
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199 | { |
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200 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) { |
201 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
202 | return SvCUR(s->var); |
203 | } |
204 | return 0; |
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205 | } |
206 | |
207 | void |
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208 | PerlIOScalar_set_ptrcnt(pTHX_ PerlIO * f, STDCHAR * ptr, SSize_t cnt) |
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209 | { |
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210 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
211 | s->posn = SvCUR(s->var) - cnt; |
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212 | } |
213 | |
214 | PerlIO * |
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215 | PerlIOScalar_open(pTHX_ PerlIO_funcs * self, PerlIO_list_t * layers, IV n, |
216 | const char *mode, int fd, int imode, int perm, |
217 | PerlIO * f, int narg, SV ** args) |
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218 | { |
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219 | SV *arg = (narg > 0) ? *args : PerlIOArg; |
220 | if (SvROK(arg) || SvPOK(arg)) { |
221 | if (!f) { |
222 | f = PerlIO_allocate(aTHX); |
223 | } |
e3feee4e |
224 | if ( (f = PerlIO_push(aTHX_ f, self, mode, arg)) ) { |
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225 | PerlIOBase(f)->flags |= PERLIO_F_OPEN; |
226 | } |
227 | return f; |
228 | } |
229 | return NULL; |
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230 | } |
231 | |
ecdeb87c |
232 | SV * |
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233 | PerlIOScalar_arg(pTHX_ PerlIO * f, CLONE_PARAMS * param, int flags) |
ecdeb87c |
234 | { |
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235 | PerlIOScalar *s = PerlIOSelf(f, PerlIOScalar); |
236 | SV *var = s->var; |
237 | if (flags & PERLIO_DUP_CLONE) |
238 | var = PerlIO_sv_dup(aTHX_ var, param); |
239 | else if (flags & PERLIO_DUP_FD) { |
240 | /* Equivalent (guesses NI-S) of dup() is to create a new scalar */ |
241 | var = newSVsv(var); |
242 | } |
243 | else { |
244 | var = SvREFCNT_inc(var); |
245 | } |
246 | return newRV_noinc(var); |
ecdeb87c |
247 | } |
248 | |
8cf8f3d1 |
249 | PerlIO * |
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250 | PerlIOScalar_dup(pTHX_ PerlIO * f, PerlIO * o, CLONE_PARAMS * param, |
251 | int flags) |
8cf8f3d1 |
252 | { |
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253 | if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) { |
254 | PerlIOScalar *fs = PerlIOSelf(f, PerlIOScalar); |
255 | PerlIOScalar *os = PerlIOSelf(o, PerlIOScalar); |
256 | /* var has been set by implicit push */ |
257 | fs->posn = os->posn; |
258 | } |
259 | return f; |
8cf8f3d1 |
260 | } |
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261 | |
27da23d5 |
262 | PERLIO_FUNCS_DECL(PerlIO_scalar) = { |
14d89041 |
263 | sizeof(PerlIO_funcs), |
264 | "scalar", |
265 | sizeof(PerlIOScalar), |
266 | PERLIO_K_BUFFERED | PERLIO_K_RAW, |
267 | PerlIOScalar_pushed, |
268 | PerlIOScalar_popped, |
269 | PerlIOScalar_open, |
270 | PerlIOBase_binmode, |
271 | PerlIOScalar_arg, |
272 | PerlIOScalar_fileno, |
273 | PerlIOScalar_dup, |
274 | PerlIOBase_read, |
275 | PerlIOScalar_unread, |
276 | PerlIOScalar_write, |
277 | PerlIOScalar_seek, |
278 | PerlIOScalar_tell, |
279 | PerlIOScalar_close, |
280 | PerlIOScalar_flush, |
281 | PerlIOScalar_fill, |
282 | PerlIOBase_eof, |
283 | PerlIOBase_error, |
284 | PerlIOBase_clearerr, |
285 | PerlIOBase_setlinebuf, |
286 | PerlIOScalar_get_base, |
287 | PerlIOScalar_bufsiz, |
288 | PerlIOScalar_get_ptr, |
289 | PerlIOScalar_get_cnt, |
290 | PerlIOScalar_set_ptrcnt, |
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291 | }; |
292 | |
293 | |
294 | #endif /* Layers available */ |
295 | |
e934609f |
296 | MODULE = PerlIO::scalar PACKAGE = PerlIO::scalar |
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297 | |
acf4de66 |
298 | PROTOTYPES: ENABLE |
299 | |
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300 | BOOT: |
301 | { |
302 | #ifdef PERLIO_LAYERS |
27da23d5 |
303 | PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_scalar)); |
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304 | #endif |
305 | } |
306 | |