1 /* Copyright (C) 1993-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Written by Per Bothner <bothner@cygnus.com>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>.
19 As a special exception, if you link the code in this file with
20 files compiled with a GNU compiler to produce an executable,
21 that does not cause the resulting executable to be covered by
22 the GNU Lesser General Public License. This exception does not
23 however invalidate any other reasons why the executable file
24 might be covered by the GNU Lesser General Public License.
25 This exception applies to code released by its copyright holders
26 in files containing the exception. */
30 # define _POSIX_SOURCE
36 #include <sys/param.h>
37 #include <sys/types.h>
44 # include "../wcsmbs/wcsmbsload.h"
45 # include "../iconv/gconv_charset.h"
46 # include "../iconv/gconv_int.h"
47 # include <shlib-compat.h>
48 # include <not-cancel.h>
49 # include <kernel-features.h>
55 # define __set_errno(Val) errno = (Val)
60 # define open(Name, Flags, Prot) __open (Name, Flags, Prot)
61 # define lseek(FD, Offset, Whence) __lseek (FD, Offset, Whence)
62 # define read(FD, Buf, NBytes) __read (FD, Buf, NBytes)
63 # define write(FD, Buf, NBytes) __write (FD, Buf, NBytes)
65 # define _IO_new_do_write _IO_do_write
66 # define _IO_new_file_attach _IO_file_attach
67 # define _IO_new_file_close_it _IO_file_close_it
68 # define _IO_new_file_finish _IO_file_finish
69 # define _IO_new_file_fopen _IO_file_fopen
70 # define _IO_new_file_init _IO_file_init
71 # define _IO_new_file_setbuf _IO_file_setbuf
72 # define _IO_new_file_sync _IO_file_sync
73 # define _IO_new_file_overflow _IO_file_overflow
74 # define _IO_new_file_seekoff _IO_file_seekoff
75 # define _IO_new_file_underflow _IO_file_underflow
76 # define _IO_new_file_write _IO_file_write
77 # define _IO_new_file_xsputn _IO_file_xsputn
82 extern struct __gconv_trans_data __libio_translit attribute_hidden
;
86 /* An fstream can be in at most one of put mode, get mode, or putback mode.
87 Putback mode is a variant of get mode.
89 In a filebuf, there is only one current position, instead of two
90 separate get and put pointers. In get mode, the current position
91 is that of gptr(); in put mode that of pptr().
93 The position in the buffer that corresponds to the position
94 in external file system is normally _IO_read_end, except in putback
95 mode, when it is _IO_save_end and also when the file is in append mode,
96 since switching from read to write mode automatically sends the position in
97 the external file system to the end of file.
98 If the field _fb._offset is >= 0, it gives the offset in
99 the file as a whole corresponding to eGptr(). (?)
102 If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end,
103 and _IO_read_base are equal to each other. These are usually equal
104 to _IO_buf_base, though not necessarily if we have switched from
105 get mode to put mode. (The reason is to maintain the invariant
106 that _IO_read_end corresponds to the external file position.)
107 _IO_write_base is non-NULL and usually equal to _IO_buf_base.
108 We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode.
109 The un-flushed character are those between _IO_write_base and _IO_write_ptr.
112 If a filebuf is in get or putback mode, eback() != egptr().
113 In get mode, the unread characters are between gptr() and egptr().
114 The OS file position corresponds to that of egptr().
117 Putback mode is used to remember "excess" characters that have
118 been sputbackc'd in a separate putback buffer.
119 In putback mode, the get buffer points to the special putback buffer.
120 The unread characters are the characters between gptr() and egptr()
121 in the putback buffer, as well as the area between save_gptr()
122 and save_egptr(), which point into the original reserve buffer.
123 (The pointers save_gptr() and save_egptr() are the values
124 of gptr() and egptr() at the time putback mode was entered.)
125 The OS position corresponds to that of save_egptr().
127 LINE BUFFERED OUTPUT:
128 During line buffered output, _IO_write_base==base() && epptr()==base().
129 However, ptr() may be anywhere between base() and ebuf().
130 This forces a call to filebuf::overflow(int C) on every put.
131 If there is more space in the buffer, and C is not a '\n',
132 then C is inserted, and pptr() incremented.
135 If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer.
138 #define CLOSED_FILEBUF_FLAGS \
139 (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET)
143 _IO_new_file_init_internal (struct _IO_FILE_plus
*fp
)
145 /* POSIX.1 allows another file handle to be used to change the position
146 of our file descriptor. Hence we actually don't know the actual
147 position before we do the first fseek (and until a following fflush). */
148 fp
->file
._offset
= _IO_pos_BAD
;
149 fp
->file
._IO_file_flags
|= CLOSED_FILEBUF_FLAGS
;
152 fp
->file
._fileno
= -1;
155 /* External version of _IO_new_file_init_internal which switches off
156 vtable validation. */
158 _IO_new_file_init (struct _IO_FILE_plus
*fp
)
160 IO_set_accept_foreign_vtables (&_IO_vtable_check
);
161 _IO_new_file_init_internal (fp
);
165 _IO_new_file_close_it (_IO_FILE
*fp
)
168 if (!_IO_file_is_open (fp
))
171 if ((fp
->_flags
& _IO_NO_WRITES
) == 0
172 && (fp
->_flags
& _IO_CURRENTLY_PUTTING
) != 0)
173 write_status
= _IO_do_flush (fp
);
177 _IO_unsave_markers (fp
);
179 int close_status
= ((fp
->_flags2
& _IO_FLAGS2_NOCLOSE
) == 0
180 ? _IO_SYSCLOSE (fp
) : 0);
183 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
186 if (_IO_have_wbackup (fp
))
187 _IO_free_wbackup_area (fp
);
188 _IO_wsetb (fp
, NULL
, NULL
, 0);
189 _IO_wsetg (fp
, NULL
, NULL
, NULL
);
190 _IO_wsetp (fp
, NULL
, NULL
);
193 _IO_setb (fp
, NULL
, NULL
, 0);
194 _IO_setg (fp
, NULL
, NULL
, NULL
);
195 _IO_setp (fp
, NULL
, NULL
);
197 _IO_un_link ((struct _IO_FILE_plus
*) fp
);
198 fp
->_flags
= _IO_MAGIC
|CLOSED_FILEBUF_FLAGS
;
200 fp
->_offset
= _IO_pos_BAD
;
202 return close_status
? close_status
: write_status
;
204 libc_hidden_ver (_IO_new_file_close_it
, _IO_file_close_it
)
207 _IO_new_file_finish (_IO_FILE
*fp
, int dummy
)
209 if (_IO_file_is_open (fp
))
212 if (!(fp
->_flags
& _IO_DELETE_DONT_CLOSE
))
215 _IO_default_finish (fp
, 0);
217 libc_hidden_ver (_IO_new_file_finish
, _IO_file_finish
)
220 _IO_file_open (_IO_FILE
*fp
, const char *filename
, int posix_mode
, int prot
,
221 int read_write
, int is32not64
)
225 if (__glibc_unlikely (fp
->_flags2
& _IO_FLAGS2_NOTCANCEL
))
226 fdesc
= open_not_cancel (filename
,
227 posix_mode
| (is32not64
? 0 : O_LARGEFILE
), prot
);
229 fdesc
= open (filename
, posix_mode
| (is32not64
? 0 : O_LARGEFILE
), prot
);
231 fdesc
= open (filename
, posix_mode
, prot
);
236 _IO_mask_flags (fp
, read_write
,_IO_NO_READS
+_IO_NO_WRITES
+_IO_IS_APPENDING
);
237 /* For append mode, send the file offset to the end of the file. Don't
238 update the offset cache though, since the file handle is not active. */
239 if ((read_write
& (_IO_IS_APPENDING
| _IO_NO_READS
))
240 == (_IO_IS_APPENDING
| _IO_NO_READS
))
242 _IO_off64_t new_pos
= _IO_SYSSEEK (fp
, 0, _IO_seek_end
);
243 if (new_pos
== _IO_pos_BAD
&& errno
!= ESPIPE
)
245 close_not_cancel (fdesc
);
249 _IO_link_in ((struct _IO_FILE_plus
*) fp
);
252 libc_hidden_def (_IO_file_open
)
255 _IO_new_file_fopen (_IO_FILE
*fp
, const char *filename
, const char *mode
,
258 int oflags
= 0, omode
;
265 const char *last_recognized
;
268 if (_IO_file_is_open (fp
))
274 read_write
= _IO_NO_WRITES
;
278 oflags
= O_CREAT
|O_TRUNC
;
279 read_write
= _IO_NO_READS
;
283 oflags
= O_CREAT
|O_APPEND
;
284 read_write
= _IO_NO_READS
|_IO_IS_APPENDING
;
287 __set_errno (EINVAL
);
291 last_recognized
= mode
;
293 for (i
= 1; i
< 7; ++i
)
301 read_write
&= _IO_IS_APPENDING
;
303 last_recognized
= mode
;
309 last_recognized
= mode
;
314 last_recognized
= mode
;
318 fp
->_flags2
|= _IO_FLAGS2_MMAP
;
321 fp
->_flags2
|= _IO_FLAGS2_NOTCANCEL
;
327 fp
->_flags2
|= _IO_FLAGS2_CLOEXEC
;
336 result
= _IO_file_open (fp
, filename
, omode
|oflags
, oprot
, read_write
,
341 #ifndef __ASSUME_O_CLOEXEC
342 if ((fp
->_flags2
& _IO_FLAGS2_CLOEXEC
) != 0 && __have_o_cloexec
<= 0)
344 int fd
= _IO_fileno (fp
);
345 if (__have_o_cloexec
== 0)
347 int flags
= __fcntl (fd
, F_GETFD
);
348 __have_o_cloexec
= (flags
& FD_CLOEXEC
) == 0 ? -1 : 1;
350 if (__have_o_cloexec
< 0)
351 __fcntl (fd
, F_SETFD
, FD_CLOEXEC
);
355 /* Test whether the mode string specifies the conversion. */
356 cs
= strstr (last_recognized
+ 1, ",ccs=");
359 /* Yep. Load the appropriate conversions and set the orientation
361 struct gconv_fcts fcts
;
362 struct _IO_codecvt
*cc
;
363 char *endp
= __strchrnul (cs
+ 5, ',');
364 char *ccs
= malloc (endp
- (cs
+ 5) + 3);
368 int malloc_err
= errno
; /* Whatever malloc failed with. */
369 (void) _IO_file_close_it (fp
);
370 __set_errno (malloc_err
);
374 *((char *) __mempcpy (ccs
, cs
+ 5, endp
- (cs
+ 5))) = '\0';
377 if (__wcsmbs_named_conv (&fcts
, ccs
[2] == '\0'
378 ? upstr (ccs
, cs
+ 5) : ccs
) != 0)
380 /* Something went wrong, we cannot load the conversion modules.
381 This means we cannot proceed since the user explicitly asked
383 (void) _IO_file_close_it (fp
);
385 __set_errno (EINVAL
);
391 assert (fcts
.towc_nsteps
== 1);
392 assert (fcts
.tomb_nsteps
== 1);
394 fp
->_wide_data
->_IO_read_ptr
= fp
->_wide_data
->_IO_read_end
;
395 fp
->_wide_data
->_IO_write_ptr
= fp
->_wide_data
->_IO_write_base
;
397 /* Clear the state. We start all over again. */
398 memset (&fp
->_wide_data
->_IO_state
, '\0', sizeof (__mbstate_t
));
399 memset (&fp
->_wide_data
->_IO_last_state
, '\0', sizeof (__mbstate_t
));
401 cc
= fp
->_codecvt
= &fp
->_wide_data
->_codecvt
;
403 /* The functions are always the same. */
404 *cc
= __libio_codecvt
;
406 cc
->__cd_in
.__cd
.__nsteps
= fcts
.towc_nsteps
;
407 cc
->__cd_in
.__cd
.__steps
= fcts
.towc
;
409 cc
->__cd_in
.__cd
.__data
[0].__invocation_counter
= 0;
410 cc
->__cd_in
.__cd
.__data
[0].__internal_use
= 1;
411 cc
->__cd_in
.__cd
.__data
[0].__flags
= __GCONV_IS_LAST
;
412 cc
->__cd_in
.__cd
.__data
[0].__statep
= &result
->_wide_data
->_IO_state
;
414 cc
->__cd_out
.__cd
.__nsteps
= fcts
.tomb_nsteps
;
415 cc
->__cd_out
.__cd
.__steps
= fcts
.tomb
;
417 cc
->__cd_out
.__cd
.__data
[0].__invocation_counter
= 0;
418 cc
->__cd_out
.__cd
.__data
[0].__internal_use
= 1;
419 cc
->__cd_out
.__cd
.__data
[0].__flags
420 = __GCONV_IS_LAST
| __GCONV_TRANSLIT
;
421 cc
->__cd_out
.__cd
.__data
[0].__statep
=
422 &result
->_wide_data
->_IO_state
;
424 /* From now on use the wide character callback functions. */
425 _IO_JUMPS_FILE_plus (fp
) = fp
->_wide_data
->_wide_vtable
;
427 /* Set the mode now. */
434 libc_hidden_ver (_IO_new_file_fopen
, _IO_file_fopen
)
437 _IO_new_file_attach (_IO_FILE
*fp
, int fd
)
439 if (_IO_file_is_open (fp
))
442 fp
->_flags
&= ~(_IO_NO_READS
+_IO_NO_WRITES
);
443 fp
->_flags
|= _IO_DELETE_DONT_CLOSE
;
444 /* Get the current position of the file. */
445 /* We have to do that since that may be junk. */
446 fp
->_offset
= _IO_pos_BAD
;
447 int save_errno
= errno
;
448 if (_IO_SEEKOFF (fp
, (_IO_off64_t
)0, _IO_seek_cur
, _IOS_INPUT
|_IOS_OUTPUT
)
449 == _IO_pos_BAD
&& errno
!= ESPIPE
)
451 __set_errno (save_errno
);
454 libc_hidden_ver (_IO_new_file_attach
, _IO_file_attach
)
457 _IO_new_file_setbuf (_IO_FILE
*fp
, char *p
, _IO_ssize_t len
)
459 if (_IO_default_setbuf (fp
, p
, len
) == NULL
)
462 fp
->_IO_write_base
= fp
->_IO_write_ptr
= fp
->_IO_write_end
464 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
468 libc_hidden_ver (_IO_new_file_setbuf
, _IO_file_setbuf
)
472 _IO_file_setbuf_mmap (_IO_FILE
*fp
, char *p
, _IO_ssize_t len
)
476 /* Change the function table. */
477 _IO_JUMPS_FILE_plus (fp
) = &_IO_file_jumps
;
478 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps
;
480 /* And perform the normal operation. */
481 result
= _IO_new_file_setbuf (fp
, p
, len
);
483 /* If the call failed, restore to using mmap. */
486 _IO_JUMPS_FILE_plus (fp
) = &_IO_file_jumps_mmap
;
487 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps_mmap
;
493 static _IO_size_t
new_do_write (_IO_FILE
*, const char *, _IO_size_t
);
495 /* Write TO_DO bytes from DATA to FP.
496 Then mark FP as having empty buffers. */
499 _IO_new_do_write (_IO_FILE
*fp
, const char *data
, _IO_size_t to_do
)
502 || (_IO_size_t
) new_do_write (fp
, data
, to_do
) == to_do
) ? 0 : EOF
;
504 libc_hidden_ver (_IO_new_do_write
, _IO_do_write
)
508 new_do_write (_IO_FILE
*fp
, const char *data
, _IO_size_t to_do
)
511 if (fp
->_flags
& _IO_IS_APPENDING
)
512 /* On a system without a proper O_APPEND implementation,
513 you would need to sys_seek(0, SEEK_END) here, but is
514 not needed nor desirable for Unix- or Posix-like systems.
515 Instead, just indicate that offset (before and after) is
517 fp
->_offset
= _IO_pos_BAD
;
518 else if (fp
->_IO_read_end
!= fp
->_IO_write_base
)
521 = _IO_SYSSEEK (fp
, fp
->_IO_write_base
- fp
->_IO_read_end
, 1);
522 if (new_pos
== _IO_pos_BAD
)
524 fp
->_offset
= new_pos
;
526 count
= _IO_SYSWRITE (fp
, data
, to_do
);
527 if (fp
->_cur_column
&& count
)
528 fp
->_cur_column
= _IO_adjust_column (fp
->_cur_column
- 1, data
, count
) + 1;
529 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
530 fp
->_IO_write_base
= fp
->_IO_write_ptr
= fp
->_IO_buf_base
;
531 fp
->_IO_write_end
= (fp
->_mode
<= 0
532 && (fp
->_flags
& (_IO_LINE_BUF
| _IO_UNBUFFERED
))
533 ? fp
->_IO_buf_base
: fp
->_IO_buf_end
);
538 _IO_new_file_underflow (_IO_FILE
*fp
)
542 /* SysV does not make this test; take it out for compatibility */
543 if (fp
->_flags
& _IO_EOF_SEEN
)
547 if (fp
->_flags
& _IO_NO_READS
)
549 fp
->_flags
|= _IO_ERR_SEEN
;
553 if (fp
->_IO_read_ptr
< fp
->_IO_read_end
)
554 return *(unsigned char *) fp
->_IO_read_ptr
;
556 if (fp
->_IO_buf_base
== NULL
)
558 /* Maybe we already have a push back pointer. */
559 if (fp
->_IO_save_base
!= NULL
)
561 free (fp
->_IO_save_base
);
562 fp
->_flags
&= ~_IO_IN_BACKUP
;
567 /* Flush all line buffered files before reading. */
568 /* FIXME This can/should be moved to genops ?? */
569 if (fp
->_flags
& (_IO_LINE_BUF
|_IO_UNBUFFERED
))
572 _IO_flush_all_linebuffered ();
574 /* We used to flush all line-buffered stream. This really isn't
575 required by any standard. My recollection is that
576 traditional Unix systems did this for stdout. stderr better
577 not be line buffered. So we do just that here
578 explicitly. --drepper */
579 _IO_acquire_lock (_IO_stdout
);
581 if ((_IO_stdout
->_flags
& (_IO_LINKED
| _IO_NO_WRITES
| _IO_LINE_BUF
))
582 == (_IO_LINKED
| _IO_LINE_BUF
))
583 _IO_OVERFLOW (_IO_stdout
, EOF
);
585 _IO_release_lock (_IO_stdout
);
589 _IO_switch_to_get_mode (fp
);
591 /* This is very tricky. We have to adjust those
592 pointers before we call _IO_SYSREAD () since
593 we may longjump () out while waiting for
594 input. Those pointers may be screwed up. H.J. */
595 fp
->_IO_read_base
= fp
->_IO_read_ptr
= fp
->_IO_buf_base
;
596 fp
->_IO_read_end
= fp
->_IO_buf_base
;
597 fp
->_IO_write_base
= fp
->_IO_write_ptr
= fp
->_IO_write_end
600 count
= _IO_SYSREAD (fp
, fp
->_IO_buf_base
,
601 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
605 fp
->_flags
|= _IO_EOF_SEEN
;
607 fp
->_flags
|= _IO_ERR_SEEN
, count
= 0;
609 fp
->_IO_read_end
+= count
;
612 /* If a stream is read to EOF, the calling application may switch active
613 handles. As a result, our offset cache would no longer be valid, so
615 fp
->_offset
= _IO_pos_BAD
;
618 if (fp
->_offset
!= _IO_pos_BAD
)
619 _IO_pos_adjust (fp
->_offset
, count
);
620 return *(unsigned char *) fp
->_IO_read_ptr
;
622 libc_hidden_ver (_IO_new_file_underflow
, _IO_file_underflow
)
624 /* Guts of underflow callback if we mmap the file. This stats the file and
625 updates the stream state to match. In the normal case we return zero.
626 If the file is no longer eligible for mmap, its jump tables are reset to
627 the vanilla ones and we return nonzero. */
629 mmap_remap_check (_IO_FILE
*fp
)
633 if (_IO_SYSSTAT (fp
, &st
) == 0
634 && S_ISREG (st
.st_mode
) && st
.st_size
!= 0
635 /* Limit the file size to 1MB for 32-bit machines. */
636 && (sizeof (ptrdiff_t) > 4 || st
.st_size
< 1*1024*1024))
638 const size_t pagesize
= __getpagesize ();
639 # define ROUNDED(x) (((x) + pagesize - 1) & ~(pagesize - 1))
640 if (ROUNDED (st
.st_size
) < ROUNDED (fp
->_IO_buf_end
643 /* We can trim off some pages past the end of the file. */
644 (void) __munmap (fp
->_IO_buf_base
+ ROUNDED (st
.st_size
),
645 ROUNDED (fp
->_IO_buf_end
- fp
->_IO_buf_base
)
646 - ROUNDED (st
.st_size
));
647 fp
->_IO_buf_end
= fp
->_IO_buf_base
+ st
.st_size
;
649 else if (ROUNDED (st
.st_size
) > ROUNDED (fp
->_IO_buf_end
652 /* The file added some pages. We need to remap it. */
654 #ifdef _G_HAVE_MREMAP
655 p
= __mremap (fp
->_IO_buf_base
, ROUNDED (fp
->_IO_buf_end
657 ROUNDED (st
.st_size
), MREMAP_MAYMOVE
);
660 (void) __munmap (fp
->_IO_buf_base
,
661 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
665 (void) __munmap (fp
->_IO_buf_base
,
666 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
667 p
= __mmap64 (NULL
, st
.st_size
, PROT_READ
, MAP_SHARED
,
672 fp
->_IO_buf_base
= p
;
673 fp
->_IO_buf_end
= fp
->_IO_buf_base
+ st
.st_size
;
677 /* The number of pages didn't change. */
678 fp
->_IO_buf_end
= fp
->_IO_buf_base
+ st
.st_size
;
682 fp
->_offset
-= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
683 _IO_setg (fp
, fp
->_IO_buf_base
,
684 fp
->_offset
< fp
->_IO_buf_end
- fp
->_IO_buf_base
685 ? fp
->_IO_buf_base
+ fp
->_offset
: fp
->_IO_buf_end
,
688 /* If we are already positioned at or past the end of the file, don't
689 change the current offset. If not, seek past what we have mapped,
690 mimicking the position left by a normal underflow reading into its
693 if (fp
->_offset
< fp
->_IO_buf_end
- fp
->_IO_buf_base
)
695 if (__lseek64 (fp
->_fileno
, fp
->_IO_buf_end
- fp
->_IO_buf_base
,
697 != fp
->_IO_buf_end
- fp
->_IO_buf_base
)
698 fp
->_flags
|= _IO_ERR_SEEN
;
700 fp
->_offset
= fp
->_IO_buf_end
- fp
->_IO_buf_base
;
707 /* Life is no longer good for mmap. Punt it. */
708 (void) __munmap (fp
->_IO_buf_base
,
709 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
711 fp
->_IO_buf_base
= fp
->_IO_buf_end
= NULL
;
712 _IO_setg (fp
, NULL
, NULL
, NULL
);
714 _IO_JUMPS_FILE_plus (fp
) = &_IO_file_jumps
;
716 _IO_JUMPS_FILE_plus (fp
) = &_IO_wfile_jumps
;
717 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps
;
723 /* Special callback replacing the underflow callbacks if we mmap the file. */
725 _IO_file_underflow_mmap (_IO_FILE
*fp
)
727 if (fp
->_IO_read_ptr
< fp
->_IO_read_end
)
728 return *(unsigned char *) fp
->_IO_read_ptr
;
730 if (__glibc_unlikely (mmap_remap_check (fp
)))
731 /* We punted to the regular file functions. */
732 return _IO_UNDERFLOW (fp
);
734 if (fp
->_IO_read_ptr
< fp
->_IO_read_end
)
735 return *(unsigned char *) fp
->_IO_read_ptr
;
737 fp
->_flags
|= _IO_EOF_SEEN
;
742 decide_maybe_mmap (_IO_FILE
*fp
)
744 /* We use the file in read-only mode. This could mean we can
745 mmap the file and use it without any copying. But not all
746 file descriptors are for mmap-able objects and on 32-bit
747 machines we don't want to map files which are too large since
748 this would require too much virtual memory. */
751 if (_IO_SYSSTAT (fp
, &st
) == 0
752 && S_ISREG (st
.st_mode
) && st
.st_size
!= 0
753 /* Limit the file size to 1MB for 32-bit machines. */
754 && (sizeof (ptrdiff_t) > 4 || st
.st_size
< 1*1024*1024)
756 && (fp
->_offset
== _IO_pos_BAD
|| fp
->_offset
<= st
.st_size
))
758 /* Try to map the file. */
761 p
= __mmap64 (NULL
, st
.st_size
, PROT_READ
, MAP_SHARED
, fp
->_fileno
, 0);
764 /* OK, we managed to map the file. Set the buffer up and use a
765 special jump table with simplified underflow functions which
766 never tries to read anything from the file. */
768 if (__lseek64 (fp
->_fileno
, st
.st_size
, SEEK_SET
) != st
.st_size
)
770 (void) __munmap (p
, st
.st_size
);
771 fp
->_offset
= _IO_pos_BAD
;
775 _IO_setb (fp
, p
, (char *) p
+ st
.st_size
, 0);
777 if (fp
->_offset
== _IO_pos_BAD
)
780 _IO_setg (fp
, p
, p
+ fp
->_offset
, p
+ st
.st_size
);
781 fp
->_offset
= st
.st_size
;
784 _IO_JUMPS_FILE_plus (fp
) = &_IO_file_jumps_mmap
;
786 _IO_JUMPS_FILE_plus (fp
) = &_IO_wfile_jumps_mmap
;
787 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps_mmap
;
794 /* We couldn't use mmap, so revert to the vanilla file operations. */
797 _IO_JUMPS_FILE_plus (fp
) = &_IO_file_jumps
;
799 _IO_JUMPS_FILE_plus (fp
) = &_IO_wfile_jumps
;
800 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps
;
804 _IO_file_underflow_maybe_mmap (_IO_FILE
*fp
)
806 /* This is the first read attempt. Choose mmap or vanilla operations
807 and then punt to the chosen underflow routine. */
808 decide_maybe_mmap (fp
);
809 return _IO_UNDERFLOW (fp
);
814 _IO_new_file_overflow (_IO_FILE
*f
, int ch
)
816 if (f
->_flags
& _IO_NO_WRITES
) /* SET ERROR */
818 f
->_flags
|= _IO_ERR_SEEN
;
822 /* If currently reading or no buffer allocated. */
823 if ((f
->_flags
& _IO_CURRENTLY_PUTTING
) == 0 || f
->_IO_write_base
== NULL
)
825 /* Allocate a buffer if needed. */
826 if (f
->_IO_write_base
== NULL
)
829 _IO_setg (f
, f
->_IO_buf_base
, f
->_IO_buf_base
, f
->_IO_buf_base
);
831 /* Otherwise must be currently reading.
832 If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end,
833 logically slide the buffer forwards one block (by setting the
834 read pointers to all point at the beginning of the block). This
835 makes room for subsequent output.
836 Otherwise, set the read pointers to _IO_read_end (leaving that
837 alone, so it can continue to correspond to the external position). */
838 if (__glibc_unlikely (_IO_in_backup (f
)))
840 size_t nbackup
= f
->_IO_read_end
- f
->_IO_read_ptr
;
841 _IO_free_backup_area (f
);
842 f
->_IO_read_base
-= MIN (nbackup
,
843 f
->_IO_read_base
- f
->_IO_buf_base
);
844 f
->_IO_read_ptr
= f
->_IO_read_base
;
847 if (f
->_IO_read_ptr
== f
->_IO_buf_end
)
848 f
->_IO_read_end
= f
->_IO_read_ptr
= f
->_IO_buf_base
;
849 f
->_IO_write_ptr
= f
->_IO_read_ptr
;
850 f
->_IO_write_base
= f
->_IO_write_ptr
;
851 f
->_IO_write_end
= f
->_IO_buf_end
;
852 f
->_IO_read_base
= f
->_IO_read_ptr
= f
->_IO_read_end
;
854 f
->_flags
|= _IO_CURRENTLY_PUTTING
;
855 if (f
->_mode
<= 0 && f
->_flags
& (_IO_LINE_BUF
| _IO_UNBUFFERED
))
856 f
->_IO_write_end
= f
->_IO_write_ptr
;
859 return _IO_do_write (f
, f
->_IO_write_base
,
860 f
->_IO_write_ptr
- f
->_IO_write_base
);
861 if (f
->_IO_write_ptr
== f
->_IO_buf_end
) /* Buffer is really full */
862 if (_IO_do_flush (f
) == EOF
)
864 *f
->_IO_write_ptr
++ = ch
;
865 if ((f
->_flags
& _IO_UNBUFFERED
)
866 || ((f
->_flags
& _IO_LINE_BUF
) && ch
== '\n'))
867 if (_IO_do_write (f
, f
->_IO_write_base
,
868 f
->_IO_write_ptr
- f
->_IO_write_base
) == EOF
)
870 return (unsigned char) ch
;
872 libc_hidden_ver (_IO_new_file_overflow
, _IO_file_overflow
)
875 _IO_new_file_sync (_IO_FILE
*fp
)
880 /* char* ptr = cur_ptr(); */
881 if (fp
->_IO_write_ptr
> fp
->_IO_write_base
)
882 if (_IO_do_flush(fp
)) return EOF
;
883 delta
= fp
->_IO_read_ptr
- fp
->_IO_read_end
;
887 if (_IO_in_backup (fp
))
888 delta
-= eGptr () - Gbase ();
890 _IO_off64_t new_pos
= _IO_SYSSEEK (fp
, delta
, 1);
891 if (new_pos
!= (_IO_off64_t
) EOF
)
892 fp
->_IO_read_end
= fp
->_IO_read_ptr
;
894 else if (errno
== ESPIPE
)
895 ; /* Ignore error from unseekable devices. */
901 fp
->_offset
= _IO_pos_BAD
;
902 /* FIXME: Cleanup - can this be shared? */
903 /* setg(base(), ptr, ptr); */
906 libc_hidden_ver (_IO_new_file_sync
, _IO_file_sync
)
909 _IO_file_sync_mmap (_IO_FILE
*fp
)
911 if (fp
->_IO_read_ptr
!= fp
->_IO_read_end
)
914 if (_IO_in_backup (fp
))
915 delta
-= eGptr () - Gbase ();
917 if (__lseek64 (fp
->_fileno
, fp
->_IO_read_ptr
- fp
->_IO_buf_base
,
919 != fp
->_IO_read_ptr
- fp
->_IO_buf_base
)
921 fp
->_flags
|= _IO_ERR_SEEN
;
925 fp
->_offset
= fp
->_IO_read_ptr
- fp
->_IO_buf_base
;
926 fp
->_IO_read_end
= fp
->_IO_read_ptr
= fp
->_IO_read_base
;
930 /* ftell{,o} implementation. The only time we modify the state of the stream
931 is when we have unflushed writes. In that case we seek to the end and
932 record that offset in the stream object. */
934 do_ftell (_IO_FILE
*fp
)
936 _IO_off64_t result
, offset
= 0;
938 /* No point looking at unflushed data if we haven't allocated buffers
940 if (fp
->_IO_buf_base
!= NULL
)
942 bool unflushed_writes
= fp
->_IO_write_ptr
> fp
->_IO_write_base
;
944 bool append_mode
= (fp
->_flags
& _IO_IS_APPENDING
) == _IO_IS_APPENDING
;
946 /* When we have unflushed writes in append mode, seek to the end of the
947 file and record that offset. This is the only time we change the file
948 stream state and it is safe since the file handle is active. */
949 if (unflushed_writes
&& append_mode
)
951 result
= _IO_SYSSEEK (fp
, 0, _IO_seek_end
);
952 if (result
== _IO_pos_BAD
)
955 fp
->_offset
= result
;
958 /* Adjust for unflushed data. */
959 if (!unflushed_writes
)
960 offset
-= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
961 /* We don't trust _IO_read_end to represent the current file offset when
962 writing in append mode because the value would have to be shifted to
963 the end of the file during a flush. Use the write base instead, along
964 with the new offset we got above when we did a seek to the end of the
966 else if (append_mode
)
967 offset
+= fp
->_IO_write_ptr
- fp
->_IO_write_base
;
968 /* For all other modes, _IO_read_end represents the file offset. */
970 offset
+= fp
->_IO_write_ptr
- fp
->_IO_read_end
;
973 if (fp
->_offset
!= _IO_pos_BAD
)
974 result
= fp
->_offset
;
976 result
= _IO_SYSSEEK (fp
, 0, _IO_seek_cur
);
985 __set_errno (EINVAL
);
993 _IO_new_file_seekoff (_IO_FILE
*fp
, _IO_off64_t offset
, int dir
, int mode
)
996 _IO_off64_t delta
, new_offset
;
999 /* Short-circuit into a separate function. We don't want to mix any
1000 functionality and we don't want to touch anything inside the FILE
1003 return do_ftell (fp
);
1005 /* POSIX.1 8.2.3.7 says that after a call the fflush() the file
1006 offset of the underlying file must be exact. */
1007 int must_be_exact
= (fp
->_IO_read_base
== fp
->_IO_read_end
1008 && fp
->_IO_write_base
== fp
->_IO_write_ptr
);
1010 bool was_writing
= (fp
->_IO_write_ptr
> fp
->_IO_write_base
1011 || _IO_in_put_mode (fp
));
1013 /* Flush unwritten characters.
1014 (This may do an unneeded write if we seek within the buffer.
1015 But to be able to switch to reading, we would need to set
1016 egptr to pptr. That can't be done in the current design,
1017 which assumes file_ptr() is eGptr. Anyway, since we probably
1018 end up flushing when we close(), it doesn't make much difference.)
1019 FIXME: simulate mem-mapped files. */
1020 if (was_writing
&& _IO_switch_to_get_mode (fp
))
1023 if (fp
->_IO_buf_base
== NULL
)
1025 /* It could be that we already have a pushback buffer. */
1026 if (fp
->_IO_read_base
!= NULL
)
1028 free (fp
->_IO_read_base
);
1029 fp
->_flags
&= ~_IO_IN_BACKUP
;
1031 _IO_doallocbuf (fp
);
1032 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1033 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1039 /* Adjust for read-ahead (bytes is buffer). */
1040 offset
-= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1042 if (fp
->_offset
== _IO_pos_BAD
)
1044 /* Make offset absolute, assuming current pointer is file_ptr(). */
1045 offset
+= fp
->_offset
;
1048 __set_errno (EINVAL
);
1059 if (_IO_SYSSTAT (fp
, &st
) == 0 && S_ISREG (st
.st_mode
))
1061 offset
+= st
.st_size
;
1068 /* At this point, dir==_IO_seek_set. */
1070 /* If destination is within current buffer, optimize: */
1071 if (fp
->_offset
!= _IO_pos_BAD
&& fp
->_IO_read_base
!= NULL
1072 && !_IO_in_backup (fp
))
1074 _IO_off64_t start_offset
= (fp
->_offset
1075 - (fp
->_IO_read_end
- fp
->_IO_buf_base
));
1076 if (offset
>= start_offset
&& offset
< fp
->_offset
)
1078 _IO_setg (fp
, fp
->_IO_buf_base
,
1079 fp
->_IO_buf_base
+ (offset
- start_offset
),
1081 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1083 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1088 if (fp
->_flags
& _IO_NO_READS
)
1091 /* Try to seek to a block boundary, to improve kernel page management. */
1092 new_offset
= offset
& ~(fp
->_IO_buf_end
- fp
->_IO_buf_base
- 1);
1093 delta
= offset
- new_offset
;
1094 if (delta
> fp
->_IO_buf_end
- fp
->_IO_buf_base
)
1096 new_offset
= offset
;
1099 result
= _IO_SYSSEEK (fp
, new_offset
, 0);
1106 count
= _IO_SYSREAD (fp
, fp
->_IO_buf_base
,
1108 ? delta
: fp
->_IO_buf_end
- fp
->_IO_buf_base
));
1111 /* We weren't allowed to read, but try to seek the remainder. */
1112 offset
= count
== EOF
? delta
: delta
-count
;
1117 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
+ delta
,
1118 fp
->_IO_buf_base
+ count
);
1119 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1120 fp
->_offset
= result
+ count
;
1121 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1125 _IO_unsave_markers (fp
);
1126 result
= _IO_SYSSEEK (fp
, offset
, dir
);
1129 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1130 fp
->_offset
= result
;
1131 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1132 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1137 /* We need to do it since it is possible that the file offset in
1138 the kernel may be changed behind our back. It may happen when
1139 we fopen a file and then do a fork. One process may access the
1140 file and the kernel file offset will be changed. */
1141 if (fp
->_offset
>= 0)
1142 _IO_SYSSEEK (fp
, fp
->_offset
, 0);
1146 libc_hidden_ver (_IO_new_file_seekoff
, _IO_file_seekoff
)
1149 _IO_file_seekoff_mmap (_IO_FILE
*fp
, _IO_off64_t offset
, int dir
, int mode
)
1153 /* If we are only interested in the current position, calculate it and
1154 return right now. This calculation does the right thing when we are
1155 using a pushback buffer, but in the usual case has the same value as
1156 (fp->_IO_read_ptr - fp->_IO_buf_base). */
1158 return fp
->_offset
- (fp
->_IO_read_end
- fp
->_IO_read_ptr
);
1163 /* Adjust for read-ahead (bytes is buffer). */
1164 offset
+= fp
->_IO_read_ptr
- fp
->_IO_read_base
;
1169 offset
+= fp
->_IO_buf_end
- fp
->_IO_buf_base
;
1172 /* At this point, dir==_IO_seek_set. */
1176 /* No negative offsets are valid. */
1177 __set_errno (EINVAL
);
1181 result
= _IO_SYSSEEK (fp
, offset
, 0);
1185 if (offset
> fp
->_IO_buf_end
- fp
->_IO_buf_base
)
1186 /* One can fseek arbitrarily past the end of the file
1187 and it is meaningless until one attempts to read.
1188 Leave the buffer pointers in EOF state until underflow. */
1189 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_end
, fp
->_IO_buf_end
);
1191 /* Adjust the read pointers to match the file position,
1192 but so the next read attempt will call underflow. */
1193 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
+ offset
,
1194 fp
->_IO_buf_base
+ offset
);
1196 fp
->_offset
= result
;
1198 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1204 _IO_file_seekoff_maybe_mmap (_IO_FILE
*fp
, _IO_off64_t offset
, int dir
,
1207 /* We only get here when we haven't tried to read anything yet.
1208 So there is nothing more useful for us to do here than just
1209 the underlying lseek call. */
1211 _IO_off64_t result
= _IO_SYSSEEK (fp
, offset
, dir
);
1215 fp
->_offset
= result
;
1220 _IO_file_read (_IO_FILE
*fp
, void *buf
, _IO_ssize_t size
)
1222 return (__builtin_expect (fp
->_flags2
& _IO_FLAGS2_NOTCANCEL
, 0)
1223 ? read_not_cancel (fp
->_fileno
, buf
, size
)
1224 : read (fp
->_fileno
, buf
, size
));
1226 libc_hidden_def (_IO_file_read
)
1229 _IO_file_seek (_IO_FILE
*fp
, _IO_off64_t offset
, int dir
)
1231 return __lseek64 (fp
->_fileno
, offset
, dir
);
1233 libc_hidden_def (_IO_file_seek
)
1236 _IO_file_stat (_IO_FILE
*fp
, void *st
)
1238 return __fxstat64 (_STAT_VER
, fp
->_fileno
, (struct stat64
*) st
);
1240 libc_hidden_def (_IO_file_stat
)
1243 _IO_file_close_mmap (_IO_FILE
*fp
)
1245 /* In addition to closing the file descriptor we have to unmap the file. */
1246 (void) __munmap (fp
->_IO_buf_base
, fp
->_IO_buf_end
- fp
->_IO_buf_base
);
1247 fp
->_IO_buf_base
= fp
->_IO_buf_end
= NULL
;
1248 /* Cancelling close should be avoided if possible since it leaves an
1249 unrecoverable state behind. */
1250 return close_not_cancel (fp
->_fileno
);
1254 _IO_file_close (_IO_FILE
*fp
)
1256 /* Cancelling close should be avoided if possible since it leaves an
1257 unrecoverable state behind. */
1258 return close_not_cancel (fp
->_fileno
);
1260 libc_hidden_def (_IO_file_close
)
1263 _IO_new_file_write (_IO_FILE
*f
, const void *data
, _IO_ssize_t n
)
1265 _IO_ssize_t to_do
= n
;
1268 _IO_ssize_t count
= (__builtin_expect (f
->_flags2
1269 & _IO_FLAGS2_NOTCANCEL
, 0)
1270 ? write_not_cancel (f
->_fileno
, data
, to_do
)
1271 : write (f
->_fileno
, data
, to_do
));
1274 f
->_flags
|= _IO_ERR_SEEN
;
1278 data
= (void *) ((char *) data
+ count
);
1281 if (f
->_offset
>= 0)
1287 _IO_new_file_xsputn (_IO_FILE
*f
, const void *data
, _IO_size_t n
)
1289 const char *s
= (const char *) data
;
1290 _IO_size_t to_do
= n
;
1292 _IO_size_t count
= 0;
1296 /* This is an optimized implementation.
1297 If the amount to be written straddles a block boundary
1298 (or the filebuf is unbuffered), use sys_write directly. */
1300 /* First figure out how much space is available in the buffer. */
1301 if ((f
->_flags
& _IO_LINE_BUF
) && (f
->_flags
& _IO_CURRENTLY_PUTTING
))
1303 count
= f
->_IO_buf_end
- f
->_IO_write_ptr
;
1307 for (p
= s
+ n
; p
> s
; )
1318 else if (f
->_IO_write_end
> f
->_IO_write_ptr
)
1319 count
= f
->_IO_write_end
- f
->_IO_write_ptr
; /* Space available. */
1321 /* Then fill the buffer. */
1327 f
->_IO_write_ptr
= __mempcpy (f
->_IO_write_ptr
, s
, count
);
1329 memcpy (f
->_IO_write_ptr
, s
, count
);
1330 f
->_IO_write_ptr
+= count
;
1335 if (to_do
+ must_flush
> 0)
1337 _IO_size_t block_size
, do_write
;
1338 /* Next flush the (full) buffer. */
1339 if (_IO_OVERFLOW (f
, EOF
) == EOF
)
1340 /* If nothing else has to be written we must not signal the
1341 caller that everything has been written. */
1342 return to_do
== 0 ? EOF
: n
- to_do
;
1344 /* Try to maintain alignment: write a whole number of blocks. */
1345 block_size
= f
->_IO_buf_end
- f
->_IO_buf_base
;
1346 do_write
= to_do
- (block_size
>= 128 ? to_do
% block_size
: 0);
1350 count
= new_do_write (f
, s
, do_write
);
1352 if (count
< do_write
)
1356 /* Now write out the remainder. Normally, this will fit in the
1357 buffer, but it's somewhat messier for line-buffered files,
1358 so we let _IO_default_xsputn handle the general case. */
1360 to_do
-= _IO_default_xsputn (f
, s
+do_write
, to_do
);
1364 libc_hidden_ver (_IO_new_file_xsputn
, _IO_file_xsputn
)
1367 _IO_file_xsgetn (_IO_FILE
*fp
, void *data
, _IO_size_t n
)
1369 _IO_size_t want
, have
;
1375 if (fp
->_IO_buf_base
== NULL
)
1377 /* Maybe we already have a push back pointer. */
1378 if (fp
->_IO_save_base
!= NULL
)
1380 free (fp
->_IO_save_base
);
1381 fp
->_flags
&= ~_IO_IN_BACKUP
;
1383 _IO_doallocbuf (fp
);
1388 have
= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1391 memcpy (s
, fp
->_IO_read_ptr
, want
);
1392 fp
->_IO_read_ptr
+= want
;
1400 s
= __mempcpy (s
, fp
->_IO_read_ptr
, have
);
1402 memcpy (s
, fp
->_IO_read_ptr
, have
);
1406 fp
->_IO_read_ptr
+= have
;
1409 /* Check for backup and repeat */
1410 if (_IO_in_backup (fp
))
1412 _IO_switch_to_main_get_area (fp
);
1416 /* If we now want less than a buffer, underflow and repeat
1417 the copy. Otherwise, _IO_SYSREAD directly to
1419 if (fp
->_IO_buf_base
1420 && want
< (size_t) (fp
->_IO_buf_end
- fp
->_IO_buf_base
))
1422 if (__underflow (fp
) == EOF
)
1428 /* These must be set before the sysread as we might longjmp out
1429 waiting for input. */
1430 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1431 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1433 /* Try to maintain alignment: read a whole number of blocks. */
1435 if (fp
->_IO_buf_base
)
1437 _IO_size_t block_size
= fp
->_IO_buf_end
- fp
->_IO_buf_base
;
1438 if (block_size
>= 128)
1439 count
-= want
% block_size
;
1442 count
= _IO_SYSREAD (fp
, s
, count
);
1446 fp
->_flags
|= _IO_EOF_SEEN
;
1448 fp
->_flags
|= _IO_ERR_SEEN
;
1455 if (fp
->_offset
!= _IO_pos_BAD
)
1456 _IO_pos_adjust (fp
->_offset
, count
);
1462 libc_hidden_def (_IO_file_xsgetn
)
1465 _IO_file_xsgetn_mmap (_IO_FILE
*fp
, void *data
, _IO_size_t n
)
1468 char *read_ptr
= fp
->_IO_read_ptr
;
1469 char *s
= (char *) data
;
1471 have
= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1475 if (__glibc_unlikely (_IO_in_backup (fp
)))
1478 s
= __mempcpy (s
, read_ptr
, have
);
1480 memcpy (s
, read_ptr
, have
);
1484 _IO_switch_to_main_get_area (fp
);
1485 read_ptr
= fp
->_IO_read_ptr
;
1486 have
= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1491 /* Check that we are mapping all of the file, in case it grew. */
1492 if (__glibc_unlikely (mmap_remap_check (fp
)))
1493 /* We punted mmap, so complete with the vanilla code. */
1494 return s
- (char *) data
+ _IO_XSGETN (fp
, data
, n
);
1496 read_ptr
= fp
->_IO_read_ptr
;
1497 have
= fp
->_IO_read_end
- read_ptr
;
1502 fp
->_flags
|= _IO_EOF_SEEN
;
1506 have
= MIN (have
, n
);
1508 s
= __mempcpy (s
, read_ptr
, have
);
1510 memcpy (s
, read_ptr
, have
);
1513 fp
->_IO_read_ptr
= read_ptr
+ have
;
1516 return s
- (char *) data
;
1520 _IO_file_xsgetn_maybe_mmap (_IO_FILE
*fp
, void *data
, _IO_size_t n
)
1522 /* We only get here if this is the first attempt to read something.
1523 Decide which operations to use and then punt to the chosen one. */
1525 decide_maybe_mmap (fp
);
1526 return _IO_XSGETN (fp
, data
, n
);
1530 versioned_symbol (libc
, _IO_new_do_write
, _IO_do_write
, GLIBC_2_1
);
1531 versioned_symbol (libc
, _IO_new_file_attach
, _IO_file_attach
, GLIBC_2_1
);
1532 versioned_symbol (libc
, _IO_new_file_close_it
, _IO_file_close_it
, GLIBC_2_1
);
1533 versioned_symbol (libc
, _IO_new_file_finish
, _IO_file_finish
, GLIBC_2_1
);
1534 versioned_symbol (libc
, _IO_new_file_fopen
, _IO_file_fopen
, GLIBC_2_1
);
1535 versioned_symbol (libc
, _IO_new_file_init
, _IO_file_init
, GLIBC_2_1
);
1536 versioned_symbol (libc
, _IO_new_file_setbuf
, _IO_file_setbuf
, GLIBC_2_1
);
1537 versioned_symbol (libc
, _IO_new_file_sync
, _IO_file_sync
, GLIBC_2_1
);
1538 versioned_symbol (libc
, _IO_new_file_overflow
, _IO_file_overflow
, GLIBC_2_1
);
1539 versioned_symbol (libc
, _IO_new_file_seekoff
, _IO_file_seekoff
, GLIBC_2_1
);
1540 versioned_symbol (libc
, _IO_new_file_underflow
, _IO_file_underflow
, GLIBC_2_1
);
1541 versioned_symbol (libc
, _IO_new_file_write
, _IO_file_write
, GLIBC_2_1
);
1542 versioned_symbol (libc
, _IO_new_file_xsputn
, _IO_file_xsputn
, GLIBC_2_1
);
1545 const struct _IO_jump_t _IO_file_jumps libio_vtable
=
1548 JUMP_INIT(finish
, _IO_file_finish
),
1549 JUMP_INIT(overflow
, _IO_file_overflow
),
1550 JUMP_INIT(underflow
, _IO_file_underflow
),
1551 JUMP_INIT(uflow
, _IO_default_uflow
),
1552 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
1553 JUMP_INIT(xsputn
, _IO_file_xsputn
),
1554 JUMP_INIT(xsgetn
, _IO_file_xsgetn
),
1555 JUMP_INIT(seekoff
, _IO_new_file_seekoff
),
1556 JUMP_INIT(seekpos
, _IO_default_seekpos
),
1557 JUMP_INIT(setbuf
, _IO_new_file_setbuf
),
1558 JUMP_INIT(sync
, _IO_new_file_sync
),
1559 JUMP_INIT(doallocate
, _IO_file_doallocate
),
1560 JUMP_INIT(read
, _IO_file_read
),
1561 JUMP_INIT(write
, _IO_new_file_write
),
1562 JUMP_INIT(seek
, _IO_file_seek
),
1563 JUMP_INIT(close
, _IO_file_close
),
1564 JUMP_INIT(stat
, _IO_file_stat
),
1565 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
1566 JUMP_INIT(imbue
, _IO_default_imbue
)
1568 libc_hidden_data_def (_IO_file_jumps
)
1570 const struct _IO_jump_t _IO_file_jumps_mmap libio_vtable
=
1573 JUMP_INIT(finish
, _IO_file_finish
),
1574 JUMP_INIT(overflow
, _IO_file_overflow
),
1575 JUMP_INIT(underflow
, _IO_file_underflow_mmap
),
1576 JUMP_INIT(uflow
, _IO_default_uflow
),
1577 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
1578 JUMP_INIT(xsputn
, _IO_new_file_xsputn
),
1579 JUMP_INIT(xsgetn
, _IO_file_xsgetn_mmap
),
1580 JUMP_INIT(seekoff
, _IO_file_seekoff_mmap
),
1581 JUMP_INIT(seekpos
, _IO_default_seekpos
),
1582 JUMP_INIT(setbuf
, (_IO_setbuf_t
) _IO_file_setbuf_mmap
),
1583 JUMP_INIT(sync
, _IO_file_sync_mmap
),
1584 JUMP_INIT(doallocate
, _IO_file_doallocate
),
1585 JUMP_INIT(read
, _IO_file_read
),
1586 JUMP_INIT(write
, _IO_new_file_write
),
1587 JUMP_INIT(seek
, _IO_file_seek
),
1588 JUMP_INIT(close
, _IO_file_close_mmap
),
1589 JUMP_INIT(stat
, _IO_file_stat
),
1590 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
1591 JUMP_INIT(imbue
, _IO_default_imbue
)
1594 const struct _IO_jump_t _IO_file_jumps_maybe_mmap libio_vtable
=
1597 JUMP_INIT(finish
, _IO_file_finish
),
1598 JUMP_INIT(overflow
, _IO_file_overflow
),
1599 JUMP_INIT(underflow
, _IO_file_underflow_maybe_mmap
),
1600 JUMP_INIT(uflow
, _IO_default_uflow
),
1601 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
1602 JUMP_INIT(xsputn
, _IO_new_file_xsputn
),
1603 JUMP_INIT(xsgetn
, _IO_file_xsgetn_maybe_mmap
),
1604 JUMP_INIT(seekoff
, _IO_file_seekoff_maybe_mmap
),
1605 JUMP_INIT(seekpos
, _IO_default_seekpos
),
1606 JUMP_INIT(setbuf
, (_IO_setbuf_t
) _IO_file_setbuf_mmap
),
1607 JUMP_INIT(sync
, _IO_new_file_sync
),
1608 JUMP_INIT(doallocate
, _IO_file_doallocate
),
1609 JUMP_INIT(read
, _IO_file_read
),
1610 JUMP_INIT(write
, _IO_new_file_write
),
1611 JUMP_INIT(seek
, _IO_file_seek
),
1612 JUMP_INIT(close
, _IO_file_close
),
1613 JUMP_INIT(stat
, _IO_file_stat
),
1614 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
1615 JUMP_INIT(imbue
, _IO_default_imbue
)