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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 | |
9 | typedef struct |
10 | { |
11 | struct _PerlIO base; /* Base "class" info */ |
12 | SV * var; |
13 | Off_t posn; |
14 | } PerlIOScalar; |
15 | |
16 | IV |
17 | PerlIOScalar_pushed(PerlIO *f, const char *mode, SV *arg) |
18 | { |
564dc057 |
19 | dTHX; |
09bf542c |
20 | IV code; |
564dc057 |
21 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
22 | /* If called (normally) via open() then arg is ref to scalar we are |
23 | using, otherwise arg (from binmode presumably) is either NULL |
24 | or the _name_ of the scalar |
25 | */ |
26 | if (arg) |
27 | { |
28 | if (SvROK(arg)) |
29 | { |
30 | s->var = SvREFCNT_inc(SvRV(arg)); |
31 | } |
32 | else |
33 | { |
34 | s->var = SvREFCNT_inc(perl_get_sv(SvPV_nolen(arg),GV_ADD|GV_ADDMULTI)); |
35 | } |
36 | } |
37 | else |
38 | { |
39 | s->var = newSVpvn("",0); |
40 | } |
41 | sv_upgrade(s->var,SVt_PV); |
09bf542c |
42 | code = PerlIOBase_pushed(f,mode,Nullsv); |
43 | if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) |
c350b88c |
44 | s->posn = SvCUR(SvRV(arg)); |
45 | else |
46 | s->posn = 0; |
09bf542c |
47 | return code; |
f6c77cf1 |
48 | } |
49 | |
50 | IV |
51 | PerlIOScalar_popped(PerlIO *f) |
52 | { |
53 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
54 | if (s->var) |
55 | { |
56 | dTHX; |
57 | SvREFCNT_dec(s->var); |
58 | s->var = Nullsv; |
59 | } |
60 | return 0; |
61 | } |
62 | |
63 | IV |
64 | PerlIOScalar_close(PerlIO *f) |
65 | { |
66 | dTHX; |
67 | IV code = PerlIOBase_close(f); |
68 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
69 | PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF|PERLIO_F_WRBUF); |
70 | return code; |
71 | } |
72 | |
73 | IV |
74 | PerlIOScalar_fileno(PerlIO *f) |
75 | { |
76 | return -1; |
77 | } |
78 | |
79 | IV |
80 | PerlIOScalar_seek(PerlIO *f, Off_t offset, int whence) |
81 | { |
82 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
83 | switch(whence) |
84 | { |
85 | case 0: |
86 | s->posn = offset; |
87 | break; |
88 | case 1: |
89 | s->posn = offset + s->posn; |
90 | break; |
91 | case 2: |
92 | s->posn = offset + SvCUR(s->var); |
93 | break; |
94 | } |
95 | if (s->posn > SvCUR(s->var)) |
96 | { |
97 | dTHX; |
98 | (void) SvGROW(s->var,s->posn); |
99 | } |
100 | return 0; |
101 | } |
102 | |
103 | Off_t |
104 | PerlIOScalar_tell(PerlIO *f) |
105 | { |
106 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
107 | return s->posn; |
108 | } |
109 | |
110 | SSize_t |
111 | PerlIOScalar_unread(PerlIO *f, const void *vbuf, Size_t count) |
112 | { |
113 | dTHX; |
114 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
115 | char *dst = SvGROW(s->var,s->posn+count); |
773aa825 |
116 | Move(vbuf,dst+s->posn,count,char); |
f6c77cf1 |
117 | s->posn += count; |
118 | SvCUR_set(s->var,s->posn); |
119 | SvPOK_on(s->var); |
120 | return count; |
121 | } |
122 | |
123 | SSize_t |
124 | PerlIOScalar_write(PerlIO *f, const void *vbuf, Size_t count) |
125 | { |
126 | if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) |
127 | { |
09bf542c |
128 | dTHX; |
129 | Off_t offset; |
130 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
131 | SV *sv = s->var; |
132 | char *dst; |
133 | if ((PerlIOBase(f)->flags) & PERLIO_F_APPEND) |
134 | { |
135 | dst = SvGROW(sv,SvCUR(sv)+count); |
136 | offset = SvCUR(sv); |
137 | s->posn = offset+count; |
138 | } |
139 | else |
140 | { |
141 | if ((s->posn+count) > SvCUR(sv)) |
142 | dst = SvGROW(sv,s->posn+count); |
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 (s->posn > SvCUR(sv)) |
150 | SvCUR_set(sv,s->posn); |
151 | SvPOK_on(s->var); |
152 | return count; |
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153 | } |
09bf542c |
154 | else |
155 | return 0; |
f6c77cf1 |
156 | } |
157 | |
158 | IV |
159 | PerlIOScalar_fill(PerlIO *f) |
160 | { |
161 | return -1; |
162 | } |
163 | |
164 | IV |
165 | PerlIOScalar_flush(PerlIO *f) |
166 | { |
167 | return 0; |
168 | } |
169 | |
170 | STDCHAR * |
171 | PerlIOScalar_get_base(PerlIO *f) |
172 | { |
173 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
174 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) |
175 | { |
176 | dTHX; |
177 | return (STDCHAR *)SvPV_nolen(s->var); |
178 | } |
a144b989 |
179 | return (STDCHAR *) Nullch; |
f6c77cf1 |
180 | } |
181 | |
182 | STDCHAR * |
183 | PerlIOScalar_get_ptr(PerlIO *f) |
184 | { |
185 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) |
186 | { |
187 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
188 | return PerlIOScalar_get_base(f)+s->posn; |
189 | } |
190 | return (STDCHAR *) Nullch; |
191 | } |
192 | |
193 | SSize_t |
194 | PerlIOScalar_get_cnt(PerlIO *f) |
195 | { |
196 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) |
197 | { |
198 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
199 | return SvCUR(s->var) - s->posn; |
200 | } |
201 | return 0; |
202 | } |
203 | |
204 | Size_t |
205 | PerlIOScalar_bufsiz(PerlIO *f) |
206 | { |
207 | if (PerlIOBase(f)->flags & PERLIO_F_CANREAD) |
208 | { |
209 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
210 | return SvCUR(s->var); |
211 | } |
212 | return 0; |
213 | } |
214 | |
215 | void |
216 | PerlIOScalar_set_ptrcnt(PerlIO *f, STDCHAR *ptr, SSize_t cnt) |
217 | { |
218 | PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar); |
219 | s->posn = SvCUR(s->var)-cnt; |
220 | } |
221 | |
222 | PerlIO * |
223 | PerlIOScalar_open(pTHX_ PerlIO_funcs *self, AV *layers, IV n, const char *mode, int fd, int imode, int perm, PerlIO *f, int narg, SV **args) |
224 | { |
225 | PerlIOScalar *s; |
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226 | SV *arg = (narg > 0) ? *args : PerlIOArg; |
227 | if (SvROK(arg) || SvPOK(arg)) |
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228 | { |
564dc057 |
229 | f = PerlIO_allocate(aTHX); |
230 | s = PerlIOSelf(PerlIO_push(aTHX_ f,self,mode,arg),PerlIOScalar); |
231 | PerlIOBase(f)->flags |= PERLIO_F_OPEN; |
232 | return f; |
f6c77cf1 |
233 | } |
234 | return NULL; |
235 | } |
236 | |
237 | |
238 | PerlIO_funcs PerlIO_scalar = { |
239 | "Scalar", |
240 | sizeof(PerlIOScalar), |
241 | PERLIO_K_BUFFERED, |
242 | PerlIOScalar_pushed, |
243 | PerlIOScalar_popped, |
244 | PerlIOScalar_open, |
245 | NULL, |
246 | PerlIOScalar_fileno, |
247 | PerlIOBase_read, |
248 | PerlIOScalar_unread, |
249 | PerlIOScalar_write, |
250 | PerlIOScalar_seek, |
251 | PerlIOScalar_tell, |
252 | PerlIOScalar_close, |
253 | PerlIOScalar_flush, |
254 | PerlIOScalar_fill, |
255 | PerlIOBase_eof, |
256 | PerlIOBase_error, |
257 | PerlIOBase_clearerr, |
258 | PerlIOBase_setlinebuf, |
259 | PerlIOScalar_get_base, |
260 | PerlIOScalar_bufsiz, |
261 | PerlIOScalar_get_ptr, |
262 | PerlIOScalar_get_cnt, |
263 | PerlIOScalar_set_ptrcnt, |
264 | }; |
265 | |
266 | |
267 | #endif /* Layers available */ |
268 | |
269 | MODULE = PerlIO::Scalar PACKAGE = PerlIO::Scalar |
270 | |
acf4de66 |
271 | PROTOTYPES: ENABLE |
272 | |
f6c77cf1 |
273 | BOOT: |
274 | { |
275 | #ifdef PERLIO_LAYERS |
276 | PerlIO_define_layer(aTHX_ &PerlIO_scalar); |
277 | #endif |
278 | } |
279 | |