1 /* Copyright (C) 1993-2023 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
);
103 /* Copy the callbacks from SOURCE to *TARGET, with pointer
106 set_callbacks (cookie_io_functions_t
*target
,
107 cookie_io_functions_t source
)
109 PTR_MANGLE (source
.read
);
110 PTR_MANGLE (source
.write
);
111 PTR_MANGLE (source
.seek
);
112 PTR_MANGLE (source
.close
);
117 _IO_cookie_init (struct _IO_cookie_file
*cfile
, int read_write
,
118 void *cookie
, cookie_io_functions_t io_functions
)
120 _IO_init_internal (&cfile
->__fp
.file
, 0);
121 _IO_JUMPS (&cfile
->__fp
) = &_IO_cookie_jumps
;
123 cfile
->__cookie
= cookie
;
124 set_callbacks (&cfile
->__io_functions
, io_functions
);
126 _IO_new_file_init_internal (&cfile
->__fp
);
128 _IO_mask_flags (&cfile
->__fp
.file
, read_write
,
129 _IO_NO_READS
+_IO_NO_WRITES
+_IO_IS_APPENDING
);
131 cfile
->__fp
.file
._flags2
|= _IO_FLAGS2_NEED_LOCK
;
133 /* We use a negative number different from -1 for _fileno to mark that
134 this special stream is not associated with a real file, but still has
135 to be treated as such. */
136 cfile
->__fp
.file
._fileno
= -2;
141 _IO_fopencookie (void *cookie
, const char *mode
,
142 cookie_io_functions_t io_functions
)
147 struct _IO_cookie_file cfile
;
156 read_write
= _IO_NO_WRITES
;
159 read_write
= _IO_NO_READS
;
162 read_write
= _IO_NO_READS
|_IO_IS_APPENDING
;
165 __set_errno (EINVAL
);
168 if (mode
[0] == '+' || (mode
[0] == 'b' && mode
[1] == '+'))
169 read_write
&= _IO_IS_APPENDING
;
171 new_f
= (struct locked_FILE
*) malloc (sizeof (struct locked_FILE
));
175 new_f
->cfile
.__fp
.file
._lock
= &new_f
->lock
;
178 _IO_cookie_init (&new_f
->cfile
, read_write
, cookie
, io_functions
);
180 return (FILE *) &new_f
->cfile
.__fp
;
183 versioned_symbol (libc
, _IO_fopencookie
, fopencookie
, GLIBC_2_2
);
185 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
188 attribute_compat_text_section
189 _IO_old_cookie_seek (FILE *fp
, off64_t offset
, int dir
)
191 struct _IO_cookie_file
*cfile
= (struct _IO_cookie_file
*) fp
;
192 int (*seek_cb
) (FILE *, off_t
, int)
193 = (int (*) (FILE *, off_t
, int)) cfile
->__io_functions
.seek
;
194 PTR_DEMANGLE (seek_cb
);
199 int ret
= seek_cb (cfile
->__cookie
, offset
, dir
);
201 return (ret
== -1) ? _IO_pos_BAD
: ret
;
205 attribute_compat_text_section
206 _IO_old_fopencookie (void *cookie
, const char *mode
,
207 cookie_io_functions_t io_functions
)
211 ret
= _IO_fopencookie (cookie
, mode
, io_functions
);
213 _IO_JUMPS_FILE_plus (ret
) = &_IO_old_cookie_jumps
;
218 compat_symbol (libc
, _IO_old_fopencookie
, fopencookie
, GLIBC_2_0
);