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f9123b5003
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..
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* fmemopen tests for BZ#1930 and BZ#20005.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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/* Check if fflush does not reset the file position. */
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static int
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do_test (void)
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{
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char buffer[500] = "x";
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FILE *stream = fmemopen (buffer, sizeof (buffer), "r+");
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if (stream == NULL)
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{
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printf ("error: fmemopen could not open stream\n");
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return 1;
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}
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const char test[] = "test";
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size_t r = fwrite (test, sizeof (char), sizeof (test), stream);
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if (r != sizeof (test))
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{
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printf ("error: fwrite returned %zu, expected %zu\n", r, sizeof(test));
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return 1;
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}
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r = ftell (stream);
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if (r != sizeof (test))
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{
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printf ("error: ftell return %zu, expected %zu\n", r, sizeof(test));
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return 1;
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}
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if (fflush (stream) != 0)
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{
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printf ("error: fflush failed\n");
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return 1;
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}
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r = ftell (stream);
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if (r != sizeof (test))
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{
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printf ("error: ftell return %zu, expected %zu\n", r, sizeof(test));
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return 1;
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}
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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