1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* Test flushing input file after ungetc (bug 5994).
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-ungetc-fflush", &filename);
TEST_VERIFY_EXIT (fd != -1);
xclose (fd);
/* Test as in bug 5994. */
FILE *fp = xfopen (filename, "w");
TEST_VERIFY_EXIT (fputs ("#include", fp) >= 0);
xfclose (fp);
fp = xfopen (filename, "r");
TEST_COMPARE (fgetc (fp), '#');
TEST_COMPARE (fgetc (fp), 'i');
TEST_COMPARE (ungetc ('@', fp), '@');
TEST_COMPARE (fflush (fp), 0);
TEST_COMPARE (lseek (fileno (fp), 0, SEEK_CUR), 1);
TEST_COMPARE (fgetc (fp), 'i');
TEST_COMPARE (fgetc (fp), 'n');
xfclose (fp);
/* Test as in bug 12799 (duplicate of 5994). */
fp = xfopen (filename, "w+");
TEST_VERIFY_EXIT (fputs ("hello world", fp) >= 0);
rewind (fp);
TEST_VERIFY (fileno (fp) >= 0);
char buffer[10];
TEST_COMPARE (fread (buffer, 1, 5, fp), 5);
TEST_COMPARE (fgetc (fp), ' ');
TEST_COMPARE (ungetc ('@', fp), '@');
TEST_COMPARE (fflush (fp), 0);
TEST_COMPARE (fgetc (fp), ' ');
xfclose (fp);
return 0;
}
#include <support/test-driver.c>
|
