1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifdef PERLIO_LAYERS
#include "perliol.h"
typedef struct
{
struct _PerlIO base; /* Base "class" info */
SV * var;
Off_t posn;
} PerlIOScalar;
IV
PerlIOScalar_pushed(PerlIO *f, const char *mode, SV *arg)
{
PerlIOScalar *b = PerlIOSelf(f,PerlIOScalar);
return PerlIOBase_pushed(f,mode,arg);
}
IV
PerlIOScalar_popped(PerlIO *f)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
if (s->var)
{
dTHX;
SvREFCNT_dec(s->var);
s->var = Nullsv;
}
return 0;
}
IV
PerlIOScalar_close(PerlIO *f)
{
dTHX;
IV code = PerlIOBase_close(f);
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF|PERLIO_F_WRBUF);
return code;
}
IV
PerlIOScalar_fileno(PerlIO *f)
{
return -1;
}
IV
PerlIOScalar_seek(PerlIO *f, Off_t offset, int whence)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
switch(whence)
{
case 0:
s->posn = offset;
break;
case 1:
s->posn = offset + s->posn;
break;
case 2:
s->posn = offset + SvCUR(s->var);
break;
}
if (s->posn > SvCUR(s->var))
{
dTHX;
(void) SvGROW(s->var,s->posn);
}
return 0;
}
Off_t
PerlIOScalar_tell(PerlIO *f)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
return s->posn;
}
SSize_t
PerlIOScalar_unread(PerlIO *f, const void *vbuf, Size_t count)
{
dTHX;
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
char *dst = SvGROW(s->var,s->posn+count);
Move(vbuf,dst,count,char);
s->posn += count;
SvCUR_set(s->var,s->posn);
SvPOK_on(s->var);
return count;
}
SSize_t
PerlIOScalar_write(PerlIO *f, const void *vbuf, Size_t count)
{
if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE)
{
return PerlIOScalar_unread(f,vbuf,count);
}
return 0;
}
IV
PerlIOScalar_fill(PerlIO *f)
{
return -1;
}
IV
PerlIOScalar_flush(PerlIO *f)
{
return 0;
}
STDCHAR *
PerlIOScalar_get_base(PerlIO *f)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
{
dTHX;
return (STDCHAR *)SvPV_nolen(s->var);
}
return (STDCHAR *) Nullch;
}
STDCHAR *
PerlIOScalar_get_ptr(PerlIO *f)
{
if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
return PerlIOScalar_get_base(f)+s->posn;
}
return (STDCHAR *) Nullch;
}
SSize_t
PerlIOScalar_get_cnt(PerlIO *f)
{
if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
return SvCUR(s->var) - s->posn;
}
return 0;
}
Size_t
PerlIOScalar_bufsiz(PerlIO *f)
{
if (PerlIOBase(f)->flags & PERLIO_F_CANREAD)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
return SvCUR(s->var);
}
return 0;
}
void
PerlIOScalar_set_ptrcnt(PerlIO *f, STDCHAR *ptr, SSize_t cnt)
{
PerlIOScalar *s = PerlIOSelf(f,PerlIOScalar);
s->posn = SvCUR(s->var)-cnt;
}
PerlIO *
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)
{
PerlIOScalar *s;
if (narg > 0)
{
SV *ref = *args;
if (SvROK(ref))
{
SV *var = SvRV(ref);
sv_upgrade(var,SVt_PV);
f = PerlIO_allocate(aTHX);
s = PerlIOSelf(PerlIO_push(aTHX_ f,self,mode,PerlIOArg),PerlIOScalar);
s->var = SvREFCNT_inc(var);
s->posn = 0;
PerlIOBase(f)->flags |= PERLIO_F_OPEN;
return f;
}
}
return NULL;
}
PerlIO_funcs PerlIO_scalar = {
"Scalar",
sizeof(PerlIOScalar),
PERLIO_K_BUFFERED,
PerlIOScalar_pushed,
PerlIOScalar_popped,
PerlIOScalar_open,
NULL,
PerlIOScalar_fileno,
PerlIOBase_read,
PerlIOScalar_unread,
PerlIOScalar_write,
PerlIOScalar_seek,
PerlIOScalar_tell,
PerlIOScalar_close,
PerlIOScalar_flush,
PerlIOScalar_fill,
PerlIOBase_eof,
PerlIOBase_error,
PerlIOBase_clearerr,
PerlIOBase_setlinebuf,
PerlIOScalar_get_base,
PerlIOScalar_bufsiz,
PerlIOScalar_get_ptr,
PerlIOScalar_get_cnt,
PerlIOScalar_set_ptrcnt,
};
#endif /* Layers available */
MODULE = PerlIO::Scalar PACKAGE = PerlIO::Scalar
BOOT:
{
#ifdef PERLIO_LAYERS
PerlIO_define_layer(aTHX_ &PerlIO_scalar);
#endif
}
|
