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libio: fmemopen rewrite to POSIX compliance

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This patch added a new fmemopen version, for glibc 2.22, that aims to be
POSIX complaint.  It fixes some long-stading glibc fmemopen issues, such
as:

* it changes the way fseek with SEEK_END works on fmemopen to seek
  relative to buffer size instead of first '\0'.  This is default mode and
  'b' opening mode does not change internal behavior (bz#6544).

* fix apending opening mode to use as start position either first null
  byte of len specified in function call (bz#13152 and #13151).

* remove binary option 'b' and internal different handling (bz#12836)

* fix seek/SEE_END with negative values (bz#14292).

A compatibility symbol is provided to with old behavior for older symbols
version (2.2.5).

	* include/stdio.h (fmemopen): Remove hidden prototype.
	(__fmemopen): Add new hidden prototype.
	* libio/Makefile: Add oldfmemopen object.
	* libio/Versions [GLIBC_2.22]: Add new fmemopen symbol.
	* libio/fmemopen.c (__fmemopen): Function rewrite to be POSIX
	compliance.
	* libio/oldfmemopen.c: New file: old fmemopen implementation for
	symbol compatibility.
	* stdio-common/Makefile [tests]: Add new tst-fmemopen3.
	* stdio-common/psiginfo.c [psiginfo]: Call __fmemopen instead of
	fmemopen.
	* stdio-common/tst-fmemopen3.c: New file: more fmemopen tests, focus
	on append and read mode.
	* sysdeps/unix/sysv/linux/aarch64/libc.abilist [GLIBC_2.22]: Add
	fmemopen.
	* sysdeps/unix/sysv/linux/alpha/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/arm/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/i386/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/sh/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/hppa/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libc.abilist [GLIBC_2.22]: Likewise.
This commit is contained in:
Adhemerval Zanella 2014-06-09 16:19:25 -03:00 committed by Adhemerval Zanella
parent 1c1e312520
commit fdb7d390dd
37 changed files with 703 additions and 114 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
ChangeLog
View File

@ -1,3 +1,73 @@
2015-07-08 Adhemerval Zanella <adhemerval.zanella@linaro.org>
[BZ #6544]
[BZ #11216]
[BZ #12836]
[BZ #13151]
[BZ #13152]
[BZ #14292]
* include/stdio.h (fmemopen): Remove hidden prototype.
(__fmemopen): Add new hidden prototype.
* libio/Makefile: Add oldfmemopen object.
* libio/Versions [GLIBC_2.22]: Add new fmemopen symbol.
* libio/fmemopen.c (__fmemopen): Function rewrite to be POSIX
compliance.
* libio/oldfmemopen.c: New file: old fmemopen implementation for
symbol compatibility.
* stdio-common/Makefile [tests]: Add new tst-fmemopen3.
* stdio-common/psiginfo.c [psiginfo]: Call __fmemopen instead of
fmemopen.
* stdio-common/tst-fmemopen3.c: New file: more fmemopen tests, focus
on append and read mode.
* sysdeps/unix/sysv/linux/aarch64/libc.abilist [GLIBC_2.22]: Add
fmemopen.
* sysdeps/unix/sysv/linux/alpha/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/arm/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/i386/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/ia64/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/microblaze/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/sh/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
[GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist [GLIBC_2.22]:
Likewise.
* sysdeps/unix/sysv/linux/hppa/libc.abilist [GLIBC_2.22]: Likewise.
* sysdeps/unix/sysv/linux/nios2/libc.abilist [GLIBC_2.22]: Likewise.
2015-07-08 Carlos O'Donell <carlos@redhat.com>
[BZ #18643]

42
NEWS
View File

@ -9,24 +9,25 @@ Version 2.22
* The following bugs are resolved with this release:
438, 4719, 6792, 13028, 13064, 14094, 14841, 14906, 14958, 15319,
15467, 15790, 15969, 16159, 16339, 16350, 16351, 16352, 16353, 16361,
16512, 16526, 16538, 16559, 16560, 16704, 16783, 16850, 17053, 17090,
17195, 17269, 17293, 17322, 17403, 17523, 17542, 17569, 17581, 17588,
17596, 17620, 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779,
17792, 17833, 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949,
17964, 17965, 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998,
17999, 18007, 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038,
18039, 18042, 18043, 18046, 18047, 18049, 18068, 18080, 18093, 18100,
18104, 18110, 18111, 18116, 18125, 18128, 18138, 18185, 18196, 18197,
18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
18247, 18287, 18319, 18324, 18333, 18346, 18371, 18397, 18409, 18410,
18412, 18418, 18422, 18434, 18435, 18444, 18468, 18469, 18470, 18479,
18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508, 18512, 18513,
18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534,
18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547, 18549, 18553,
18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593, 18594, 18602,
18612, 18613, 18619, 18633, 18641, 18643.
438, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152, 14094,
14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969, 16159, 16339,
16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538, 16559, 16560,
16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293, 17322, 17403,
17523, 17542, 17569, 17581, 17588, 17596, 17620, 17621, 17628, 17631,
17692, 17711, 17715, 17776, 17779, 17792, 17833, 17836, 17841, 17912,
17916, 17930, 17932, 17944, 17949, 17964, 17965, 17967, 17969, 17977,
17978, 17987, 17991, 17996, 17998, 17999, 18007, 18019, 18020, 18029,
18030, 18032, 18034, 18036, 18038, 18039, 18042, 18043, 18046, 18047,
18049, 18068, 18080, 18093, 18100, 18104, 18110, 18111, 18116, 18125,
18128, 18138, 18185, 18196, 18197, 18206, 18210, 18211, 18217, 18219,
18220, 18221, 18234, 18244, 18245, 18247, 18287, 18319, 18324, 18333,
18346, 18371, 18397, 18409, 18410, 18412, 18418, 18422, 18434, 18435,
18444, 18468, 18469, 18470, 18479, 18483, 18495, 18496, 18497, 18498,
18502, 18507, 18508, 18512, 18513, 18519, 18520, 18522, 18527, 18528,
18529, 18530, 18532, 18533, 18534, 18536, 18539, 18540, 18542, 18544,
18545, 18546, 18547, 18549, 18553, 18557, 18558, 18569, 18583, 18585,
18586, 18592, 18593, 18594, 18602, 18612, 18613, 18619, 18633, 18641.
18643.
* Cache information can be queried via sysconf() function on s390 e.g. with
_SC_LEVEL1_ICACHE_SIZE as argument.
@ -65,6 +66,11 @@ Version 2.22
Shared library libmvec.so is linked in as needed when using -lm (no need to
specify -lmvec explicitly for not static builds).
Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
* A new fmemopen implementation has been added with the goal of POSIX
compliance. The new implementation fixes the following long-standing
issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
old implementation is still present for use be by existing binaries.
Version 2.21

3
include/stdio.h
View File

@ -197,6 +197,9 @@ gets (char *__str)
}
# endif
extern FILE * __fmemopen (void *buf, size_t len, const char *mode);
libc_hidden_proto (__fmemopen)
__END_DECLS
# endif

2
libio/Makefile
View File

@ -46,7 +46,7 @@ routines := \
__fbufsize __freading __fwriting __freadable __fwritable __flbf \
__fpurge __fpending __fsetlocking \
\
libc_fatal fmemopen
libc_fatal fmemopen oldfmemopen
tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \
tst_wprintf2 tst-widetext test-fmemopen tst-ext tst-ext2 \

4
libio/Versions
View File

@ -148,6 +148,10 @@ libc {
GLIBC_2.4 {
open_wmemstream;
}
GLIBC_2.22 {
# f*
fmemopen;
}
GLIBC_PRIVATE {
# Used by NPTL and librt
__libc_fatal;

140
libio/fmemopen.c
View File

@ -1,7 +1,6 @@
/* Fmemopen implementation.
Copyright (C) 2000-2015 Free Software Foundation, Inc.
/* fmemopen implementation.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Hanno Mueller, kontakt@hanno.de, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -17,54 +16,10 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/*
* fmemopen() - "my" version of a string stream
* Hanno Mueller, kontakt@hanno.de
*
*
* I needed fmemopen() for an application that I currently work on,
* but couldn't find it in libio. The following snippet of code is an
* attempt to implement what glibc's documentation describes.
*
*
*
* I already see some potential problems:
*
* - I never used the "original" fmemopen(). I am sure that "my"
* fmemopen() behaves differently than the original version.
*
* - The documentation doesn't say wether a string stream allows
* seeks. I checked the old fmemopen implementation in glibc's stdio
* directory, wasn't quite able to see what is going on in that
* source, but as far as I understand there was no seek there. For
* my application, I needed fseek() and ftell(), so it's here.
*
* - "append" mode and fseek(p, SEEK_END) have two different ideas
* about the "end" of the stream.
*
* As described in the documentation, when opening the file in
* "append" mode, the position pointer will be set to the first null
* character of the string buffer (yet the buffer may already
* contain more data). For fseek(), the last byte of the buffer is
* used as the end of the stream.
*
* - It is unclear to me what the documentation tries to say when it
* explains what happens when you use fmemopen with a NULL
* buffer.
*
* Quote: "fmemopen [then] allocates an array SIZE bytes long. This
* is really only useful if you are going to write things to the
* buffer and then read them back in again."
*
* What does that mean if the original fmemopen() did not allow
* seeking? How do you read what you just wrote without seeking back
* to the beginning of the stream?
*
* - I think there should be a second version of fmemopen() that does
* not add null characters for each write. (At least in my
* application, I am not actually using strings but binary data and
* so I don't need the stream to add null characters on its own.)
*/
/* fmemopen() from 2.22 and forward works as defined by POSIX. It also
provides an older symbol, version 2.2.5, that behaves different regarding
SEEK_END (libio/oldfmemopen.c). */
#include <errno.h>
#include <libio.h>
@ -79,25 +34,23 @@
typedef struct fmemopen_cookie_struct fmemopen_cookie_t;
struct fmemopen_cookie_struct
{
char *buffer;
int mybuffer;
int binmode;
size_t size;
_IO_off64_t pos;
size_t maxpos;
char *buffer; /* memory buffer. */
int mybuffer; /* allocated my buffer? */
int append; /* buffer open for append? */
size_t size; /* buffer length in bytes. */
_IO_off64_t pos; /* current position at the buffer. */
size_t maxpos; /* max position in buffer. */
};
static ssize_t
fmemopen_read (void *cookie, char *b, size_t s)
{
fmemopen_cookie_t *c;
fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;
c = (fmemopen_cookie_t *) cookie;
if (c->pos + s > c->size)
if (c->pos + s > c->maxpos)
{
if ((size_t) c->pos == c->size)
if ((size_t) c->pos == c->maxpos)
return 0;
s = c->size - c->pos;
}
@ -115,29 +68,28 @@ fmemopen_read (void *cookie, char *b, size_t s)
static ssize_t
fmemopen_write (void *cookie, const char *b, size_t s)
{
fmemopen_cookie_t *c;
fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;;
_IO_off64_t pos = c->append ? c->maxpos : c->pos;
int addnullc;
c = (fmemopen_cookie_t *) cookie;
addnullc = (s == 0 || b[s - 1] != '\0');
addnullc = c->binmode == 0 && (s == 0 || b[s - 1] != '\0');
if (c->pos + s + addnullc > c->size)
if (pos + s + addnullc > c->size)
{
if ((size_t) (c->pos + addnullc) >= c->size)
{
__set_errno (ENOSPC);
return 0;
}
s = c->size - c->pos - addnullc;
s = c->size - pos - addnullc;
}
memcpy (&(c->buffer[c->pos]), b, s);
memcpy (&(c->buffer[pos]), b, s);
c->pos += s;
if ((size_t) c->pos > c->maxpos)
pos += s;
if ((size_t) pos > c->maxpos)
{
c->maxpos = c->pos;
c->maxpos = pos;
if (addnullc)
c->buffer[c->maxpos] = '\0';
}
@ -150,9 +102,7 @@ static int
fmemopen_seek (void *cookie, _IO_off64_t *p, int w)
{
_IO_off64_t np;
fmemopen_cookie_t *c;
c = (fmemopen_cookie_t *) cookie;
fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;
switch (w)
{
@ -165,7 +115,7 @@ fmemopen_seek (void *cookie, _IO_off64_t *p, int w)
break;
case SEEK_END:
np = (c->binmode ? c->size : c->maxpos) - *p;
np = c->maxpos + *p;
break;
default:
@ -184,9 +134,7 @@ fmemopen_seek (void *cookie, _IO_off64_t *p, int w)
static int
fmemopen_close (void *cookie)
{
fmemopen_cookie_t *c;
c = (fmemopen_cookie_t *) cookie;
fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;
if (c->mybuffer)
free (c->buffer);
@ -197,18 +145,11 @@ fmemopen_close (void *cookie)
FILE *
fmemopen (void *buf, size_t len, const char *mode)
__fmemopen (void *buf, size_t len, const char *mode)
{
cookie_io_functions_t iof;
fmemopen_cookie_t *c;
if (__glibc_unlikely (len == 0))
{
einval:
__set_errno (EINVAL);
return NULL;
}
c = (fmemopen_cookie_t *) malloc (sizeof (fmemopen_cookie_t));
if (c == NULL)
return NULL;
@ -231,26 +172,38 @@ fmemopen (void *buf, size_t len, const char *mode)
if (__glibc_unlikely ((uintptr_t) len > -(uintptr_t) buf))
{
free (c);
goto einval;
__set_errno (EINVAL);
return NULL;
}
c->buffer = buf;
if (mode[0] == 'w')
/* POSIX states that w+ mode should truncate the buffer. */
if (mode[0] == 'w' && mode[1] == '+')
c->buffer[0] = '\0';
c->maxpos = strnlen (c->buffer, len);
}
/* Mode | starting position (cookie::pos) | size (cookie::size)
------ |----------------------------------|-----------------------------
read | beginning of the buffer | size argument
write | beginning of the buffer | zero
append | first null or size buffer + 1 | first null or size argument
*/
c->size = len;
if (mode[0] == 'a')
if (mode[0] == 'r')
c->maxpos = len;
c->append = mode[0] == 'a';
if (c->append)
c->pos = c->maxpos;
else
c->pos = 0;
c->binmode = mode[0] != '\0' && mode[1] == 'b';
iof.read = fmemopen_read;
iof.write = fmemopen_write;
iof.seek = fmemopen_seek;
@ -258,4 +211,5 @@ fmemopen (void *buf, size_t len, const char *mode)
return _IO_fopencookie (c, mode, iof);
}
libc_hidden_def (fmemopen)
libc_hidden_def (__fmemopen)
versioned_symbol (libc, __fmemopen, fmemopen, GLIBC_2_22);

265
libio/oldfmemopen.c Normal file
View File

@ -0,0 +1,265 @@
/* Fmemopen implementation.
Copyright (C) 2000-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Hanno Mueller, kontakt@hanno.de, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/*
* fmemopen() - "my" version of a string stream
* Hanno Mueller, kontakt@hanno.de
*
*
* I needed fmemopen() for an application that I currently work on,
* but couldn't find it in libio. The following snippet of code is an
* attempt to implement what glibc's documentation describes.
*
*
*
* I already see some potential problems:
*
* - I never used the "original" fmemopen(). I am sure that "my"
* fmemopen() behaves differently than the original version.
*
* - The documentation doesn't say wether a string stream allows
* seeks. I checked the old fmemopen implementation in glibc's stdio
* directory, wasn't quite able to see what is going on in that
* source, but as far as I understand there was no seek there. For
* my application, I needed fseek() and ftell(), so it's here.
*
* - "append" mode and fseek(p, SEEK_END) have two different ideas
* about the "end" of the stream.
*
* As described in the documentation, when opening the file in
* "append" mode, the position pointer will be set to the first null
* character of the string buffer (yet the buffer may already
* contain more data). For fseek(), the last byte of the buffer is
* used as the end of the stream.
*
* - It is unclear to me what the documentation tries to say when it
* explains what happens when you use fmemopen with a NULL
* buffer.
*
* Quote: "fmemopen [then] allocates an array SIZE bytes long. This
* is really only useful if you are going to write things to the
* buffer and then read them back in again."
*
* What does that mean if the original fmemopen() did not allow
* seeking? How do you read what you just wrote without seeking back
* to the beginning of the stream?
*
* - I think there should be a second version of fmemopen() that does
* not add null characters for each write. (At least in my
* application, I am not actually using strings but binary data and
* so I don't need the stream to add null characters on its own.)
*/
#include "libioP.h"
#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_22)
#include <errno.h>
#include <libio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
typedef struct fmemopen_cookie_struct fmemopen_cookie_t;
struct fmemopen_cookie_struct
{
char *buffer;
int mybuffer;
int binmode;
size_t size;
_IO_off64_t pos;
size_t maxpos;
};
static ssize_t
fmemopen_read (void *cookie, char *b, size_t s)
{
fmemopen_cookie_t *c;
c = (fmemopen_cookie_t *) cookie;
if (c->pos + s > c->size)
{
if ((size_t) c->pos == c->size)
return 0;
s = c->size - c->pos;
}
memcpy (b, &(c->buffer[c->pos]), s);
c->pos += s;
if ((size_t) c->pos > c->maxpos)
c->maxpos = c->pos;
return s;
}
static ssize_t
fmemopen_write (void *cookie, const char *b, size_t s)
{
fmemopen_cookie_t *c;
int addnullc;
c = (fmemopen_cookie_t *) cookie;
addnullc = c->binmode == 0 && (s == 0 || b[s - 1] != '\0');
if (c->pos + s + addnullc > c->size)
{
if ((size_t) (c->pos + addnullc) >= c->size)
{
__set_errno (ENOSPC);
return 0;
}
s = c->size - c->pos - addnullc;
}
memcpy (&(c->buffer[c->pos]), b, s);
c->pos += s;
if ((size_t) c->pos > c->maxpos)
{
c->maxpos = c->pos;
if (addnullc)
c->buffer[c->maxpos] = '\0';
}
return s;
}
static int
fmemopen_seek (void *cookie, _IO_off64_t *p, int w)
{
_IO_off64_t np;
fmemopen_cookie_t *c;
c = (fmemopen_cookie_t *) cookie;
switch (w)
{
case SEEK_SET:
np = *p;
break;
case SEEK_CUR:
np = c->pos + *p;
break;
case SEEK_END:
np = (c->binmode ? c->size : c->maxpos) - *p;
break;
default:
return -1;
}
if (np < 0 || (size_t) np > c->size)
return -1;
*p = c->pos = np;
return 0;
}
static int
fmemopen_close (void *cookie)
{
fmemopen_cookie_t *c;
c = (fmemopen_cookie_t *) cookie;
if (c->mybuffer)
free (c->buffer);
free (c);
return 0;
}
FILE *
__old_fmemopen (void *buf, size_t len, const char *mode)
{
cookie_io_functions_t iof;
fmemopen_cookie_t *c;
if (__glibc_unlikely (len == 0))
{
einval:
__set_errno (EINVAL);
return NULL;
}
c = (fmemopen_cookie_t *) malloc (sizeof (fmemopen_cookie_t));
if (c == NULL)
return NULL;
c->mybuffer = (buf == NULL);
if (c->mybuffer)
{
c->buffer = (char *) malloc (len);
if (c->buffer == NULL)
{
free (c);
return NULL;
}
c->buffer[0] = '\0';
c->maxpos = 0;
}
else
{
if (__glibc_unlikely ((uintptr_t) len > -(uintptr_t) buf))
{
free (c);
goto einval;
}
c->buffer = buf;
if (mode[0] == 'w')
c->buffer[0] = '\0';
c->maxpos = strnlen (c->buffer, len);
}
c->size = len;
if (mode[0] == 'a')
c->pos = c->maxpos;
else
c->pos = 0;
c->binmode = mode[0] != '\0' && mode[1] == 'b';
iof.read = fmemopen_read;
iof.write = fmemopen_write;
iof.seek = fmemopen_seek;
iof.close = fmemopen_close;
return _IO_fopencookie (c, mode, iof);
}
compat_symbol (libc, __old_fmemopen, fmemopen, GLIBC_2_2);
#endif

2
stdio-common/Makefile
View File

@ -57,7 +57,7 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
bug19 bug19a tst-popen2 scanf13 scanf14 scanf15 bug20 bug21 bug22 \
scanf16 scanf17 tst-setvbuf1 tst-grouping bug23 bug24 \
bug-vfprintf-nargs tst-long-dbl-fphex tst-fphex-wide tst-sprintf3 \
bug25 tst-printf-round bug23-2 bug23-3 bug23-4 bug26
bug25 tst-printf-round bug23-2 bug23-3 bug23-4 bug26 tst-fmemopen3
test-srcs = tst-unbputc tst-printf

2
stdio-common/psiginfo.c
View File

@ -60,7 +60,7 @@ void
psiginfo (const siginfo_t *pinfo, const char *s)
{
char buf[512];
FILE *fp = fmemopen (buf, sizeof (buf), "w");
FILE *fp = __fmemopen (buf, sizeof (buf), "w");
if (fp == NULL)
{
const char *colon;

206
stdio-common/tst-fmemopen3.c Normal file
View File

@ -0,0 +1,206 @@
/* fmemopen tests for append and read mode.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
static void
print_buffer (const char *s, size_t n)
{
size_t i;
for (i=0; i<n; ++i)
printf ("0x%02X (%c), ", s[i], s[i]);
}
/* This test check append mode initial position (a/a+) based on POSIX defition
(BZ#6544 and BZ#13151). */
static int
do_test_write_append (const char *mode)
{
char buf[32] = "testing buffer";
char exp[32] = "testing bufferXX";
FILE *fp = fmemopen (buf, sizeof (buf), mode);
fflush (fp);
fprintf (fp, "X");
fseek (fp, 0, SEEK_SET);
fprintf (fp, "X");
fclose (fp);
if (strcmp (buf, exp) != 0)
{
printf ("%s: check failed: %s != %s\n", __FUNCTION__, buf, exp);
return 1;
}
return 0;
}
/* This test check append mode initial position (a/a+) based on POSIX defition
(BZ#6544 and BZ#13151) for buffer without null byte end. */
static int
do_test_write_append_without_null (const char *mode)
{
char buf[] = { 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55 };
char exp[] = { 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55 };
/* If '\0' is not found in buffer, POSIX states that SEEK_SET should be
the size argument. */
FILE *fp = fmemopen (buf, sizeof (buf) - 2, "a");
fflush (fp);
fputc (0x70, fp);
fseek (fp, 0, SEEK_SET);
fputc (0x70, fp);
fputc (0x70, fp);
fclose (fp);
/* POSIX also states that a write operation on the stream shall not advance
the current buffer size beyond the size given in fmemopen, so the string
should be same. */
if (memcmp (buf, exp, sizeof (buf)) != 0)
{
printf ("%s: check failed: ", __FUNCTION__);
print_buffer (buf, sizeof (buf));
printf ("!= ");
print_buffer (exp, sizeof (exp));
printf ("\n");
return 1;
}
return 0;
}
/* This test check for initial position and feek value for fmemopen objects
opened with append mode. */
static int
do_test_read_append (void)
{
char buf[32] = "testing buffer";
size_t buflen = strlen (buf);
long fpos;
/* POSIX defines for 'a+' the initial position is the first null byte. */
FILE *fp = fmemopen (buf, sizeof (buf), "a+");
fpos = ftell (fp);
if (fpos != buflen)
{
printf ("%s: ftell|SEEK_SET (fp) %li != strlen (%s) %zu\n",
__FUNCTION__, fpos, buf, buflen);
fclose (fp);
return 1;
}
fseek (fp, 0, SEEK_END);
if (fpos != buflen)
{
printf ("%s: ftell|SEEK_END (fp) %li != strlen (%s) %zu\n",
__FUNCTION__, fpos, buf, buflen);
fclose (fp);
return 1;
}
fclose (fp);
/* Check if attempting to read past the current size, defined as strlen (buf)
yield an EOF. */
fp = fmemopen (buf, sizeof (buf), "a+");
if (getc(fp) != EOF)
{
printf ("%s: getc(fp) != EOF\n", __FUNCTION__);
fclose (fp);
return -1;
}
fclose (fp);
return 0;
}
/* This test check for fseek (SEEK_END) using negative offsets (BZ#14292). The
starting position of descriptor is different base on the opening mode. */
static int
do_test_read_seek_neg (const char *mode, const char *expected)
{
char buf[] = "abcdefghijklmnopqrstuvxz0123456789";
char tmp[10];
size_t tmps = sizeof (tmps);
long offset = -11;
FILE *fp = fmemopen (buf, sizeof (buf), mode);
fseek (fp, offset, SEEK_END);
fread (tmp, tmps, 1, fp);
if (memcmp (tmp, expected, tmps) != 0)
{
printf ("%s: fmemopen(%s) - fseek (fp, %li, SEEK_END):\n",
__FUNCTION__, mode, offset);
printf (" returned: ");
print_buffer (tmp, tmps);
printf ("\n");
printf (" expected: ");
print_buffer (expected, tmps);
printf ("\n");
return 1;
}
fclose (fp);
return 0;
}
static int
do_test_read_seek_negative (void)
{
int ret = 0;
/* 'r' and 'w' modes defines the initial position at the buffer start and
seek with SEEK_END shall seek relative to its size give in fmemopen
call. The expected tmp result is 0 to 9 *without* the ending null */
ret += do_test_read_seek_neg ("r", "0123456789");
/* 'a+' mode sets the initial position at the first null byte in buffer and
SEEK_END shall seek relative to its size as well. The expected result is
z012345678, since SEEK_END plus a+ start at '\0', not size. */
ret += do_test_read_seek_neg ("a+", "z012345678");
return ret;
}
static int
do_test (void)
{
int ret = 0;
ret += do_test_write_append ("a");
ret += do_test_write_append_without_null ("a");
ret += do_test_write_append ("a+");
ret += do_test_write_append_without_null ("a+");
ret += do_test_read_append ();
ret += do_test_read_seek_negative ();
return ret;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"

3
sysdeps/unix/sysv/linux/aarch64/libc.abilist
View File

@ -2081,3 +2081,6 @@ GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
_mcount F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F

3
sysdeps/unix/sysv/linux/alpha/libc.abilist
View File

@ -1822,6 +1822,9 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.2
GLIBC_2.2 A
_IO_adjust_wcolumn F

3
sysdeps/unix/sysv/linux/arm/libc.abilist
View File

@ -89,6 +89,9 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.4
GLIBC_2.4 A
_Exit F

3
sysdeps/unix/sysv/linux/hppa/libc.abilist
View File

@ -95,6 +95,9 @@ GLIBC_2.18
GLIBC_2.19
GLIBC_2.19 A
fanotify_mark F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.2
GLIBC_2.2 A
_Exit F

3
sysdeps/unix/sysv/linux/i386/libc.abilist
View File

@ -2023,6 +2023,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/ia64/libc.abilist
View File

@ -1881,6 +1881,9 @@ GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
getunwind F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
View File

@ -90,6 +90,9 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.4
GLIBC_2.4 A
_Exit F

3
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
View File

@ -1979,6 +1979,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/microblaze/libc.abilist
View File

@ -2080,3 +2080,6 @@ GLIBC_2.18
xencrypt F
xprt_register F
xprt_unregister F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F

3
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
View File

@ -1951,6 +1951,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
View File

@ -1949,6 +1949,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
View File

@ -1947,6 +1947,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
View File

@ -1941,6 +1941,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/nios2/libc.abilist
View File

@ -2121,3 +2121,6 @@ GLIBC_2.21
xencrypt F
xprt_register F
xprt_unregister F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F

3
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
View File

@ -1983,6 +1983,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
View File

@ -1989,6 +1989,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
View File

@ -90,6 +90,9 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
_Exit F

3
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
View File

@ -1984,6 +1984,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
View File

@ -1880,6 +1880,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/sh/libc.abilist
View File

@ -1864,6 +1864,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
View File

@ -1975,6 +1975,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
View File

@ -1908,6 +1908,9 @@ GLIBC_2.2.4
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
View File

@ -2091,3 +2091,6 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F

3
sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
View File

@ -2091,3 +2091,6 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F

3
sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
View File

@ -2091,3 +2091,6 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F

3
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
View File

@ -1854,6 +1854,9 @@ GLIBC_2.2.5
GLIBC_2.2.6
GLIBC_2.2.6 A
__nanosleep F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F
GLIBC_2.3
GLIBC_2.3 A
__ctype_b_loc F

3
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
View File

@ -2089,3 +2089,6 @@ GLIBC_2.17
GLIBC_2.18
GLIBC_2.18 A
__cxa_thread_atexit_impl F
GLIBC_2.22
GLIBC_2.22 A
fmemopen F