On Thu, Jan 3, 2019 at 5:17 AM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>
> On 03/01/19 6:38 PM, Florian Weimer wrote:
> > You should use array_length (buf) here (and include <array_length.h>).
> > fgetws does not expect a ybte byte count.
Thanks for catching that.
> Fine from the freeze perspective, but this needs a more descriptive
> commit description.
Revised patch attached.
With respect to timing, I would prefer to postpone pushing this to
master until after 2.29 is released, so that both stdout and stdin
(which I'll fix next) are fixed together in 2.30.
Alternatively, I can extend this patch to also cover stdin. Maybe
that's actually better?
Thanks!
@@ -1,3 +1,16 @@
+2019-01-03 Paul Pluzhnikov <ppluzhnikov@google.com>
+
+ [BZ #24051]
+ * libio/ioputs.c (_IO_puts): Use stdout instead of _IO_stdout.
+ * libio/fileops.c (_IO_new_file_underflow): Likewise
+ * libio/wfileops.c (_IO_wfile_underflow): Likewise
+ * libio/putchar.c (putchar): Likewise.
+ * libio/putchar_u.c (putchar_unlocked): Likewise.
+ * libio/putwchar.c (putchar): Likewise.
+ * libio/putwchar_u.c (putwchar_unlocked): Likewise.
+ * libio/tst-bz24051.c: New test.
+ * libio/Makefile (tests): Add tst-bz24051
+
2019-01-03 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
@@ -65,7 +65,7 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \
tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos tst-fseek \
tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler \
tst-ftell-append tst-fputws tst-bz22415 tst-fgetc-after-eof \
- tst-sprintf-ub tst-sprintf-chk-ub
+ tst-sprintf-ub tst-sprintf-chk-ub tst-bz24051
tests-internal = tst-vtables tst-vtables-interposed tst-readline
@@ -501,13 +501,13 @@ _IO_new_file_underflow (FILE *fp)
traditional Unix systems did this for stdout. stderr better
not be line buffered. So we do just that here
explicitly. --drepper */
- _IO_acquire_lock (_IO_stdout);
+ _IO_acquire_lock (stdout);
- if ((_IO_stdout->_flags & (_IO_LINKED | _IO_NO_WRITES | _IO_LINE_BUF))
+ if ((stdout->_flags & (_IO_LINKED | _IO_NO_WRITES | _IO_LINE_BUF))
== (_IO_LINKED | _IO_LINE_BUF))
- _IO_OVERFLOW (_IO_stdout, EOF);
+ _IO_OVERFLOW (stdout, EOF);
- _IO_release_lock (_IO_stdout);
+ _IO_release_lock (stdout);
}
_IO_switch_to_get_mode (fp);
@@ -33,15 +33,15 @@ _IO_puts (const char *str)
{
int result = EOF;
size_t len = strlen (str);
- _IO_acquire_lock (_IO_stdout);
+ _IO_acquire_lock (stdout);
- if ((_IO_vtable_offset (_IO_stdout) != 0
- || _IO_fwide (_IO_stdout, -1) == -1)
- && _IO_sputn (_IO_stdout, str, len) == len
- && _IO_putc_unlocked ('\n', _IO_stdout) != EOF)
+ if ((_IO_vtable_offset (stdout) != 0
+ || _IO_fwide (stdout, -1) == -1)
+ && _IO_sputn (stdout, str, len) == len
+ && _IO_putc_unlocked ('\n', stdout) != EOF)
result = MIN (INT_MAX, len + 1);
- _IO_release_lock (_IO_stdout);
+ _IO_release_lock (stdout);
return result;
}
@@ -24,9 +24,9 @@ int
putchar (int c)
{
int result;
- _IO_acquire_lock (_IO_stdout);
- result = _IO_putc_unlocked (c, _IO_stdout);
- _IO_release_lock (_IO_stdout);
+ _IO_acquire_lock (stdout);
+ result = _IO_putc_unlocked (c, stdout);
+ _IO_release_lock (stdout);
return result;
}
@@ -23,6 +23,6 @@
int
putchar_unlocked (int c)
{
- CHECK_FILE (_IO_stdout, EOF);
- return _IO_putc_unlocked (c, _IO_stdout);
+ CHECK_FILE (stdout, EOF);
+ return _IO_putc_unlocked (c, stdout);
}
@@ -22,8 +22,8 @@ wint_t
putwchar (wchar_t wc)
{
wint_t result;
- _IO_acquire_lock (_IO_stdout);
- result = _IO_putwc_unlocked (wc, _IO_stdout);
- _IO_release_lock (_IO_stdout);
+ _IO_acquire_lock (stdout);
+ result = _IO_putwc_unlocked (wc, stdout);
+ _IO_release_lock (stdout);
return result;
}
@@ -21,6 +21,6 @@
wint_t
putwchar_unlocked (wchar_t wc)
{
- CHECK_FILE (_IO_stdout, WEOF);
- return _IO_putwc_unlocked (wc, _IO_stdout);
+ CHECK_FILE (stdout, WEOF);
+ return _IO_putwc_unlocked (wc, stdout);
}
new file mode 100644
@@ -0,0 +1,81 @@
+/* Test that assigning to stdout redirects puts, putchar, etc (BZ#24051)
+ Copyright (C) 2019 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/>. */
+
+
+/* Prevent putchar -> _IO_putc inline expansion. */
+#define __NO_INLINE__
+#pragma GCC optimize("O0")
+
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+
+#include <array_length.h>
+#include <support/check.h>
+#include <support/temp_file.h>
+#include <support/test-driver.h>
+
+#undef putchar
+#undef putwchar
+
+static int
+do_test_narrow (void)
+{
+ char buf[100];
+ int fd = create_temp_file ("tst-bz24051", NULL);
+ stdout = fdopen (fd, "w+");
+ TEST_VERIFY_EXIT (stdout != NULL);
+
+ printf ("ab%s", "cd");
+ putchar ('e');
+ putchar_unlocked ('f');
+ puts ("ghi");
+
+ rewind (stdout);
+ TEST_VERIFY_EXIT (fgets (buf, sizeof (buf), stdout) != NULL);
+ TEST_VERIFY (strcmp (buf, "abcdefghi\n") == 0);
+
+ return 0;
+}
+
+static int
+do_test_wide (void)
+{
+ wchar_t buf[100];
+ int fd = create_temp_file ("tst-bz24051w", NULL);
+ stdout = fdopen (fd, "w+");
+ TEST_VERIFY_EXIT (stdout != NULL);
+
+ wprintf (L"ab%ls", L"cd");
+ putwchar (L'e');
+ putwchar_unlocked (L'f');
+
+ rewind (stdout);
+ TEST_VERIFY_EXIT (fgetws (buf, array_length (buf), stdout) != NULL);
+ TEST_VERIFY (wcscmp (buf, L"abcdef") == 0);
+
+ return 0;
+}
+
+static int
+do_test (void)
+{
+ return do_test_narrow () + do_test_wide ();
+}
+
+#include <support/test-driver.c>
@@ -208,13 +208,13 @@ _IO_wfile_underflow (FILE *fp)
traditional Unix systems did this for stdout. stderr better
not be line buffered. So we do just that here
explicitly. --drepper */
- _IO_acquire_lock (_IO_stdout);
+ _IO_acquire_lock (stdout);
- if ((_IO_stdout->_flags & (_IO_LINKED | _IO_NO_WRITES | _IO_LINE_BUF))
+ if ((stdout->_flags & (_IO_LINKED | _IO_NO_WRITES | _IO_LINE_BUF))
== (_IO_LINKED | _IO_LINE_BUF))
- _IO_OVERFLOW (_IO_stdout, EOF);
+ _IO_OVERFLOW (stdout, EOF);
- _IO_release_lock (_IO_stdout);
+ _IO_release_lock (stdout);
}
_IO_switch_to_get_mode (fp);