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/* Test fseek on files using mmap (bug 32529).
Copyright (C) 2025 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 <support/check.h>
#include <support/temp_file.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
int
do_test (void)
{
char *filename = NULL;
int fd = create_temp_file ("tst-fseek-mmap", &filename);
TEST_VERIFY_EXIT (fd != -1);
xclose (fd);
/* Test fseek after ungetc (bug 32529). */
FILE *fp = xfopen (filename, "w");
TEST_VERIFY (0 <= fputs ("test", fp));
xfclose (fp);
fp = xfopen (filename, "rm");
TEST_COMPARE (fgetc (fp), 't');
TEST_COMPARE (ungetc ('u', fp), 'u');
TEST_COMPARE (fseek (fp, 0, SEEK_CUR), 0);
xfclose (fp);
/* Test fseek positioning after fflush (another issue covered by the
same fix). */
fp = xfopen (filename, "rm");
TEST_COMPARE (fgetc (fp), 't');
TEST_COMPARE (fflush (fp), 0);
TEST_COMPARE (ftell (fp), 1);
TEST_COMPARE (fseek (fp, 0, SEEK_CUR), 0);
TEST_COMPARE (ftell (fp), 1);
TEST_COMPARE (fgetc (fp), 'e');
xfclose (fp);
return 0;
}
#include <support/test-driver.c>
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