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98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/* Check static buffer handling with setvbuf (BZ #22415)
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Copyright (C) 2017-2020 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 <stdlib.h>
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#include <wchar.h>
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#include <mcheck.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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static int
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do_test (void)
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{
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mtrace ();
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char *temp_file;
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TEST_VERIFY_EXIT (create_temp_file ("tst-bz22145.", &temp_file));
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char buf[BUFSIZ];
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{
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/* Check if backup buffer is correctly freed and changing back
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to normal buffer does not trigger an invalid free in case of
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static buffer set by setvbuf. */
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FILE *f = fopen (temp_file, "w+b");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
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TEST_VERIFY_EXIT (ungetc ('x', f) == 'x');
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TEST_VERIFY_EXIT (fseek (f, 0L, SEEK_SET) == 0);
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TEST_VERIFY_EXIT (fputc ('y', f) == 'y');
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TEST_VERIFY_EXIT (fclose (f) == 0);
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}
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{
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/* Check if backup buffer is correctly freed and changing back
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to normal buffer does not trigger an invalid free in case of
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static buffer set by setvbuf. */
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FILE *f = fopen (temp_file, "w+b");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
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TEST_VERIFY_EXIT (ungetc ('x', f) == 'x');
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TEST_VERIFY_EXIT (fputc ('y', f) == 'y');
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TEST_VERIFY_EXIT (fclose (f) == 0);
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}
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{
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FILE *f = fopen (temp_file, "w+b");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
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TEST_VERIFY_EXIT (ungetwc (L'x', f) == L'x');
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TEST_VERIFY_EXIT (fseek (f, 0L, SEEK_SET) == 0);
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TEST_VERIFY_EXIT (fputwc (L'y', f) == L'y');
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TEST_VERIFY_EXIT (fclose (f) == 0);
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}
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{
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FILE *f = fopen (temp_file, "w+b");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
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TEST_VERIFY_EXIT (ungetwc (L'x', f) == L'x');
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TEST_VERIFY_EXIT (fputwc (L'y', f) == L'y');
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TEST_VERIFY_EXIT (fclose (f) == 0);
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}
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free (temp_file);
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return 0;
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}
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#include <support/test-driver.c>
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