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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2016-04-26 17:40:25 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2016-04-26 17:40:25 -0300
commitf9123b5003e62b6e54996076e860f23aee9a0593 (patch)
treec32d506730558f13d1c93c3296c698a6a61cd7a0 /stdio-common
parent085bbece2c6afc5f13698b52fac0299445c4317f (diff)
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libio: Update internal fmemopen position after write (BZ #20005)
Current GLIBC fmemopen fails with a simple testcase: char buffer[500] = "x"; FILE *stream; stream = fmemopen(buffer, 500, "r+"); fwrite("fish",sizeof(char),5,stream); printf("pos-1:%ld\n",ftell(stream)); fflush(stream); printf("pos-2:%ld\n",ftell(stream)); It returns: pos-1:5 pos-2:0 Where it should return: pos-1:5 pos-2:5 This is due the internal write function does not correctly update the internal object position state and then the seek operation returns a wrong value. This patch fixes it. It fixes both BZ #20005 and BZ #19230 (marked as duplicated). A new test is added to check for such case. Tested on x86_64 and i686. * libio/fmemopen.c (fmemopen_write): Update internal position after write. * stdio-common/Makefile (tests): Add tst-fmemopen4.c. * stdio-common/tst-fmemopen4.c: New file..
Diffstat (limited to 'stdio-common')
-rw-r--r--stdio-common/Makefile2
-rw-r--r--stdio-common/tst-fmemopen4.c71
2 files changed, 72 insertions, 1 deletions
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 6c597c1926..4c4834bea0 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -58,7 +58,7 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
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 tst-fmemopen3 \
- tst-printf-bz18872 tst-vfprintf-width-prec
+ tst-printf-bz18872 tst-vfprintf-width-prec tst-fmemopen4
test-srcs = tst-unbputc tst-printf
diff --git a/stdio-common/tst-fmemopen4.c b/stdio-common/tst-fmemopen4.c
new file mode 100644
index 0000000000..e24f1cacd9
--- /dev/null
+++ b/stdio-common/tst-fmemopen4.c
@@ -0,0 +1,71 @@
+/* fmemopen tests for BZ#1930 and BZ#20005.
+ Copyright (C) 2016 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>
+
+
+/* Check if fflush does not reset the file position. */
+static int
+do_test (void)
+{
+ char buffer[500] = "x";
+
+ FILE *stream = fmemopen (buffer, sizeof (buffer), "r+");
+ if (stream == NULL)
+ {
+ printf ("error: fmemopen could not open stream\n");
+ return 1;
+ }
+
+ const char test[] = "test";
+
+ size_t r = fwrite (test, sizeof (char), sizeof (test), stream);
+ if (r != sizeof (test))
+ {
+ printf ("error: fwrite returned %zu, expected %zu\n", r, sizeof(test));
+ return 1;
+ }
+
+ r = ftell (stream);
+ if (r != sizeof (test))
+ {
+ printf ("error: ftell return %zu, expected %zu\n", r, sizeof(test));
+ return 1;
+ }
+
+ if (fflush (stream) != 0)
+ {
+ printf ("error: fflush failed\n");
+ return 1;
+ }
+
+ r = ftell (stream);
+ if (r != sizeof (test))
+ {
+ printf ("error: ftell return %zu, expected %zu\n", r, sizeof(test));
+ return 1;
+ }
+
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"