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/* Check static buffer handling with setvbuf (BZ #22415)
Copyright (C) 2017-2024 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
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <mcheck.h>
#include <support/check.h>
#include <support/temp_file.h>
static int
do_test (void)
{
mtrace ();
char *temp_file;
TEST_VERIFY_EXIT (create_temp_file ("tst-bz22145.", &temp_file));
char buf[BUFSIZ];
{
/* Check if backup buffer is correctly freed and changing back
to normal buffer does not trigger an invalid free in case of
static buffer set by setvbuf. */
FILE *f = fopen (temp_file, "w+b");
TEST_VERIFY_EXIT (f != NULL);
TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
TEST_VERIFY_EXIT (ungetc ('x', f) == 'x');
TEST_VERIFY_EXIT (fseek (f, 0L, SEEK_SET) == 0);
TEST_VERIFY_EXIT (fputc ('y', f) == 'y');
TEST_VERIFY_EXIT (fclose (f) == 0);
}
{
/* Check if backup buffer is correctly freed and changing back
to normal buffer does not trigger an invalid free in case of
static buffer set by setvbuf. */
FILE *f = fopen (temp_file, "w+b");
TEST_VERIFY_EXIT (f != NULL);
TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
TEST_VERIFY_EXIT (ungetc ('x', f) == 'x');
TEST_VERIFY_EXIT (fputc ('y', f) == 'y');
TEST_VERIFY_EXIT (fclose (f) == 0);
}
{
FILE *f = fopen (temp_file, "w+b");
TEST_VERIFY_EXIT (f != NULL);
TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
TEST_VERIFY_EXIT (ungetwc (L'x', f) == L'x');
TEST_VERIFY_EXIT (fseek (f, 0L, SEEK_SET) == 0);
TEST_VERIFY_EXIT (fputwc (L'y', f) == L'y');
TEST_VERIFY_EXIT (fclose (f) == 0);
}
{
FILE *f = fopen (temp_file, "w+b");
TEST_VERIFY_EXIT (f != NULL);
TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
TEST_VERIFY_EXIT (ungetwc (L'x', f) == L'x');
TEST_VERIFY_EXIT (fputwc (L'y', f) == L'y');
TEST_VERIFY_EXIT (fclose (f) == 0);
}
free (temp_file);
return 0;
}
#include <support/test-driver.c>
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