1/* fmemopen tests for BZ#1930 and BZ#20005.
2 Copyright (C) 2016-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <assert.h>
20#include <stdio.h>
21#include <string.h>
22#include <sys/types.h>
23
24
25/* Check if fflush does not reset the file position. */
26static int
27do_test (void)
28{
29 char buffer[500] = "x";
30
31 FILE *stream = fmemopen (buffer, sizeof (buffer), "r+");
32 if (stream == NULL)
33 {
34 printf (format: "error: fmemopen could not open stream\n");
35 return 1;
36 }
37
38 const char test[] = "test";
39
40 size_t r = fwrite (test, sizeof (char), sizeof (test), stream);
41 if (r != sizeof (test))
42 {
43 printf (format: "error: fwrite returned %zu, expected %zu\n", r, sizeof (test));
44 return 1;
45 }
46
47 r = ftell (stream: stream);
48 if (r != sizeof (test))
49 {
50 printf (format: "error: ftell return %zu, expected %zu\n", r, sizeof (test));
51 return 1;
52 }
53
54 if (fflush (stream) != 0)
55 {
56 printf (format: "error: fflush failed\n");
57 return 1;
58 }
59
60 r = ftell (stream: stream);
61 if (r != sizeof (test))
62 {
63 printf (format: "error: ftell return %zu, expected %zu\n", r, sizeof (test));
64 return 1;
65 }
66
67 return 0;
68}
69
70#define TEST_FUNCTION do_test ()
71#include "../test-skeleton.c"
72

source code of glibc/stdio-common/tst-fmemopen4.c