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5d4ab106d4
Ensure that fwrite() behaves correctly even when the stream is read-only. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/* Test fwrite on a read-only stream.
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Copyright (C) 2024 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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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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#include <support/xstdio.h>
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#include <support/xunistd.h>
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/* A small buffer size is enough to run this test. */
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#define BUFSIZE 4
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static int
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do_test (void)
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{
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int fd;
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FILE *f;
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struct stat64 st;
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/* Create a temporary file and open it in read-only mode. */
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fd = create_temp_file ("tst-fwrite-ro", NULL);
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TEST_VERIFY_EXIT (fd != -1);
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f = fdopen (fd, "r");
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TEST_VERIFY_EXIT (f != NULL);
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/* Try to write to the temporary file with nmemb = 0, then check that
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fwrite returns 0. No errors are expected from this. */
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TEST_COMPARE (fwrite ("a", 1, 0, f), 0);
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TEST_COMPARE (ferror (f), 0);
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/* Try to write to the temporary file with size = 0, then check that
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fwrite returns 0. No errors are expected from this. */
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TEST_COMPARE (fwrite ("a", 0, 1, f), 0);
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TEST_COMPARE (ferror (f), 0);
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/* Try to write a single byte to the temporary file, then check that
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fwrite returns 0. Check if an error was reported. */
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TEST_COMPARE (fwrite ("a", 1, 1, f), 0);
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TEST_COMPARE (ferror (f), 1);
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clearerr (f);
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xfstat64 (fd, &st);
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TEST_COMPARE (st.st_size, 0);
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xfclose (f);
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return 0;
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}
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#include <support/test-driver.c>
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