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/* Test for ungetc bugs.
Copyright (C) 1996-2025 Free Software Foundation, Inc.
Copyright The GNU Toolchain Authors.
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 <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
static int
do_test (void)
{
char *name = NULL;
FILE *fp = NULL;
int c;
char buffer[64];
int fd = create_temp_file ("tst-ungetc.", &name);
if (fd == -1)
FAIL_EXIT1 ("cannot create temporary file: %m");
xclose (fd);
fp = xfopen (name, "w");
fputs ("bla", fp);
xfclose (fp);
fp = xfopen (name, "r");
TEST_VERIFY_EXIT (ungetc ('z', fp) == 'z');
TEST_VERIFY_EXIT (getc (fp) == 'z');
TEST_VERIFY_EXIT (getc (fp) == 'b');
TEST_VERIFY_EXIT (getc (fp) == 'l');
TEST_VERIFY_EXIT (ungetc ('m', fp) == 'm');
TEST_VERIFY_EXIT (ungetc ('n', fp) == 'n');
TEST_VERIFY_EXIT (getc (fp) == 'n');
TEST_VERIFY_EXIT (getc (fp) == 'm');
TEST_VERIFY_EXIT ((c = getc (fp)) == 'a');
TEST_VERIFY_EXIT (getc (fp) == EOF);
TEST_VERIFY_EXIT (ungetc (c, fp) == c);
TEST_VERIFY_EXIT (feof (fp) == 0);
TEST_VERIFY_EXIT (getc (fp) == c);
TEST_VERIFY_EXIT (getc (fp) == EOF);
xfclose (fp);
fp = xfopen (name, "r");
TEST_VERIFY_EXIT (getc (fp) == 'b');
TEST_VERIFY_EXIT (getc (fp) == 'l');
TEST_VERIFY_EXIT (ungetc ('b', fp) == 'b');
TEST_VERIFY_EXIT (fread (buffer, 1, 64, fp) == 2);
TEST_VERIFY_EXIT (buffer[0] == 'b');
TEST_VERIFY_EXIT (buffer[1] == 'a');
xfclose (fp);
return 0;
}
#include <support/test-driver.c>
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