1/* Test the strlcpy function.
2 Copyright (C) 2023-2024 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 <string.h>
20#include <stdlib.h>
21#include <stdio.h>
22#include <support/check.h>
23
24static int
25do_test (void)
26{
27 struct {
28 char buf1[16];
29 char buf2[16];
30 } s;
31
32 /* Nothing is written to the destination if its size is 0. */
33 memset (&s, '@', sizeof (s));
34 TEST_COMPARE (strlcpy (s.buf1, "Hello!", 0), 6);
35 TEST_COMPARE_BLOB (&s, sizeof (s), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
36
37 /* No bytes are are modified in the target buffer if the source
38 string is short enough. */
39 memset (&s, '@', sizeof (s));
40 TEST_COMPARE (strlcpy (s.buf1, "Hello!", sizeof (s.buf1)), 6);
41 TEST_COMPARE_BLOB (&s, sizeof (s), "Hello!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
42
43 /* A source string which fits exactly into the destination buffer is
44 not truncated. */
45 memset (&s, '@', sizeof (s));
46 TEST_COMPARE (strlcpy (s.buf1, "Hello, world!!!", sizeof (s.buf1)), 15);
47 TEST_COMPARE_BLOB (&s, sizeof (s),
48 "Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
49
50 /* A source string one character longer than the destination buffer
51 is truncated by one character. The untruncated source length is
52 returned. */
53 memset (&s, '@', sizeof (s));
54 TEST_COMPARE (strlcpy (s.buf1, "Hello, world!!!!", sizeof (s.buf1)), 16);
55 TEST_COMPARE_BLOB (&s, sizeof (s),
56 "Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
57
58 /* An even longer source string is truncated as well, and the
59 original length is returned. */
60 memset (&s, '@', sizeof (s));
61 TEST_COMPARE (strlcpy (s.buf1, "Hello, world!!!!!!!!", sizeof (s.buf1)), 20);
62 TEST_COMPARE_BLOB (&s, sizeof (s),
63 "Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
64
65 return 0;
66}
67
68#include <support/test-driver.c>
69

source code of glibc/string/tst-strlcpy.c