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Carlos O'Donell
6b9135f75b
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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Regression test for ungetwc operating on byte stream (BZ #33998)
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Copyright The GNU Toolchain Authors.
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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 "support/temp_file.h"
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#include "support/xstdio.h"
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#include "support/xunistd.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <stdio.h>
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#include <wchar.h>
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#include <support/check.h>
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static int
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do_test (void)
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{
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char *filename;
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int fd = create_temp_file ("tst-bz33998-", &filename);
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TEST_VERIFY (fd != -1);
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xwrite (fd, "A", sizeof ("A")); // write "A\0" by design
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xclose (fd);
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FILE *fp = xfopen (filename, "r+");
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TEST_COMPARE (getwc (fp), L'A');
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/* If the bug is fixed, then ungetwc should not touch byte stream.
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If the bug is not fixed, ungetwc firstly match last read char, L'A',
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failed, then the pbackfail branch, matching last read char in byte
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stream, that is, '\0' (initialized when setup wide stream). */
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char *old_read_ptr = fp->_IO_read_ptr;
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TEST_COMPARE (ungetwc (L'\0', fp), L'\0');
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TEST_VERIFY (fp->_IO_read_ptr == old_read_ptr);
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xfclose (fp);
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free (filename);
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return 0;
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}
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#include <support/test-driver.c>
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