1 /* Copyright (C) 1993-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>.
18 As a special exception, if you link the code in this file with
19 files compiled with a GNU compiler to produce an executable,
20 that does not cause the resulting executable to be covered by
21 the GNU Lesser General Public License. This exception does not
22 however invalidate any other reasons why the executable file
23 might be covered by the GNU Lesser General Public License.
24 This exception applies to code released by its copyright holders
25 in files containing the exception. */
30 #include <shlib-compat.h>
31 #include <pointer_guard.h>
34 _IO_cookie_read (FILE *fp
, void *buf
, ssize_t size
)
36 struct _IO_cookie_file
*cfile
= (struct _IO_cookie_file
*) fp
;
37 cookie_read_function_t
*read_cb
= cfile
->__io_functions
.read
;
38 PTR_DEMANGLE (read_cb
);
43 return read_cb (cfile
->__cookie
, buf
, size
);
47 _IO_cookie_write (FILE *fp
, const void *buf
, ssize_t size
)
49 struct _IO_cookie_file
*cfile
= (struct _IO_cookie_file
*) fp
;
50 cookie_write_function_t
*write_cb
= cfile
->__io_functions
.write
;
51 PTR_DEMANGLE (write_cb
);
55 fp
->_flags
|= _IO_ERR_SEEN
;
59 ssize_t n
= write_cb (cfile
->__cookie
, buf
, size
);
61 fp
->_flags
|= _IO_ERR_SEEN
;
67 _IO_cookie_seek (FILE *fp
, off64_t offset
, int dir
)
69 struct _IO_cookie_file
*cfile
= (struct _IO_cookie_file
*) fp
;
70 cookie_seek_function_t
*seek_cb
= cfile
->__io_functions
.seek
;
71 PTR_DEMANGLE (seek_cb
);
73 return ((seek_cb
== NULL
74 || (seek_cb (cfile
->__cookie
, &offset
, dir
)
76 || offset
== (off64_t
) -1)
77 ? _IO_pos_BAD
: offset
);
81 _IO_cookie_close (FILE *fp
)
83 struct _IO_cookie_file
*cfile
= (struct _IO_cookie_file
*) fp
;
84 cookie_close_function_t
*close_cb
= cfile
->__io_functions
.close
;
85 PTR_DEMANGLE (close_cb
);
90 return close_cb (cfile
->__cookie
);
95 _IO_cookie_seekoff (FILE *fp
, off64_t offset
, int dir
, int mode
)
97 /* We must force the fileops code to always use seek to determine
99 fp
->_offset
= _IO_pos_BAD
;
100 return _IO_file_seekoff (fp
, offset
, dir
, mode
);
104 static const struct _IO_jump_t _IO_cookie_jumps libio_vtable
= {
106 JUMP_INIT(finish
, _IO_file_finish
),
107 JUMP_INIT(overflow
, _IO_file_overflow
),
108 JUMP_INIT(underflow
, _IO_file_underflow
),
109 JUMP_INIT(uflow
, _IO_default_uflow
),
110 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
111 JUMP_INIT(xsputn
, _IO_file_xsputn
),
112 JUMP_INIT(xsgetn
, _IO_default_xsgetn
),
113 JUMP_INIT(seekoff
, _IO_cookie_seekoff
),
114 JUMP_INIT(seekpos
, _IO_default_seekpos
),
115 JUMP_INIT(setbuf
, _IO_file_setbuf
),
116 JUMP_INIT(sync
, _IO_file_sync
),
117 JUMP_INIT(doallocate
, _IO_file_doallocate
),
118 JUMP_INIT(read
, _IO_cookie_read
),
119 JUMP_INIT(write
, _IO_cookie_write
),
120 JUMP_INIT(seek
, _IO_cookie_seek
),
121 JUMP_INIT(close
, _IO_cookie_close
),
122 JUMP_INIT(stat
, _IO_default_stat
),
123 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
124 JUMP_INIT(imbue
, _IO_default_imbue
),
128 /* Copy the callbacks from SOURCE to *TARGET, with pointer
131 set_callbacks (cookie_io_functions_t
*target
,
132 cookie_io_functions_t source
)
134 PTR_MANGLE (source
.read
);
135 PTR_MANGLE (source
.write
);
136 PTR_MANGLE (source
.seek
);
137 PTR_MANGLE (source
.close
);
142 _IO_cookie_init (struct _IO_cookie_file
*cfile
, int read_write
,
143 void *cookie
, cookie_io_functions_t io_functions
)
145 _IO_init_internal (&cfile
->__fp
.file
, 0);
146 _IO_JUMPS (&cfile
->__fp
) = &_IO_cookie_jumps
;
148 cfile
->__cookie
= cookie
;
149 set_callbacks (&cfile
->__io_functions
, io_functions
);
151 _IO_new_file_init_internal (&cfile
->__fp
);
153 _IO_mask_flags (&cfile
->__fp
.file
, read_write
,
154 _IO_NO_READS
+_IO_NO_WRITES
+_IO_IS_APPENDING
);
156 cfile
->__fp
.file
._flags2
|= _IO_FLAGS2_NEED_LOCK
;
158 /* We use a negative number different from -1 for _fileno to mark that
159 this special stream is not associated with a real file, but still has
160 to be treated as such. */
161 cfile
->__fp
.file
._fileno
= -2;
166 _IO_fopencookie (void *cookie
, const char *mode
,
167 cookie_io_functions_t io_functions
)
172 struct _IO_cookie_file cfile
;
181 read_write
= _IO_NO_WRITES
;
184 read_write
= _IO_NO_READS
;
187 read_write
= _IO_NO_READS
|_IO_IS_APPENDING
;
190 __set_errno (EINVAL
);
193 if (mode
[0] == '+' || (mode
[0] == 'b' && mode
[1] == '+'))
194 read_write
&= _IO_IS_APPENDING
;
196 new_f
= (struct locked_FILE
*) malloc (sizeof (struct locked_FILE
));
200 new_f
->cfile
.__fp
.file
._lock
= &new_f
->lock
;
203 _IO_cookie_init (&new_f
->cfile
, read_write
, cookie
, io_functions
);
205 return (FILE *) &new_f
->cfile
.__fp
;
208 versioned_symbol (libc
, _IO_fopencookie
, fopencookie
, GLIBC_2_2
);
210 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
213 attribute_compat_text_section
214 _IO_old_cookie_seek (FILE *fp
, off64_t offset
, int dir
)
216 struct _IO_cookie_file
*cfile
= (struct _IO_cookie_file
*) fp
;
217 int (*seek_cb
) (FILE *, off_t
, int)
218 = (int (*) (FILE *, off_t
, int)) cfile
->__io_functions
.seek
;
219 PTR_DEMANGLE (seek_cb
);
224 int ret
= seek_cb (cfile
->__cookie
, offset
, dir
);
226 return (ret
== -1) ? _IO_pos_BAD
: ret
;
229 static const struct _IO_jump_t _IO_old_cookie_jumps libio_vtable
= {
231 JUMP_INIT(finish
, _IO_file_finish
),
232 JUMP_INIT(overflow
, _IO_file_overflow
),
233 JUMP_INIT(underflow
, _IO_file_underflow
),
234 JUMP_INIT(uflow
, _IO_default_uflow
),
235 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
236 JUMP_INIT(xsputn
, _IO_file_xsputn
),
237 JUMP_INIT(xsgetn
, _IO_default_xsgetn
),
238 JUMP_INIT(seekoff
, _IO_cookie_seekoff
),
239 JUMP_INIT(seekpos
, _IO_default_seekpos
),
240 JUMP_INIT(setbuf
, _IO_file_setbuf
),
241 JUMP_INIT(sync
, _IO_file_sync
),
242 JUMP_INIT(doallocate
, _IO_file_doallocate
),
243 JUMP_INIT(read
, _IO_cookie_read
),
244 JUMP_INIT(write
, _IO_cookie_write
),
245 JUMP_INIT(seek
, _IO_old_cookie_seek
),
246 JUMP_INIT(close
, _IO_cookie_close
),
247 JUMP_INIT(stat
, _IO_default_stat
),
248 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
249 JUMP_INIT(imbue
, _IO_default_imbue
),
253 attribute_compat_text_section
254 _IO_old_fopencookie (void *cookie
, const char *mode
,
255 cookie_io_functions_t io_functions
)
259 ret
= _IO_fopencookie (cookie
, mode
, io_functions
);
261 _IO_JUMPS_FILE_plus (ret
) = &_IO_old_cookie_jumps
;
266 compat_symbol (libc
, _IO_old_fopencookie
, fopencookie
, GLIBC_2_0
);