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