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