1 | /* Test the strlcat 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 | |
24 | static int |
25 | do_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 (strlcat (s.buf1, "" , 0), 0); |
35 | TEST_COMPARE_BLOB (&s, sizeof (s), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" , 32); |
36 | TEST_COMPARE (strlcat (s.buf1, "Hello!" , 0), 6); |
37 | TEST_COMPARE_BLOB (&s, sizeof (s), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@" , 32); |
38 | |
39 | /* No bytes are are modified in the target buffer if the source |
40 | string is short enough. */ |
41 | memset (&s, '@', sizeof (s)); |
42 | strcpy (s.buf1, "He" ); |
43 | TEST_COMPARE (strlcat (s.buf1, "llo!" , sizeof (s.buf1)), 6); |
44 | TEST_COMPARE_BLOB (&s, sizeof (s), "Hello!\0@@@@@@@@@@@@@@@@@@@@@@@@@" , 32); |
45 | |
46 | /* A source string which fits exactly into the destination buffer is |
47 | not truncated. */ |
48 | memset (&s, '@', sizeof (s)); |
49 | strcpy (s.buf1, "H" ); |
50 | TEST_COMPARE (strlcat (s.buf1, "ello, world!!!" , sizeof (s.buf1)), 15); |
51 | TEST_COMPARE_BLOB (&s, sizeof (s), |
52 | "Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@" , 32); |
53 | |
54 | /* A source string one character longer than the destination buffer |
55 | is truncated by one character. The total length is returned. */ |
56 | memset (&s, '@', sizeof (s)); |
57 | strcpy (s.buf1, "Hello" ); |
58 | TEST_COMPARE (strlcat (s.buf1, ", world!!!!" , sizeof (s.buf1)), 16); |
59 | TEST_COMPARE_BLOB (&s, sizeof (s), |
60 | "Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@" , 32); |
61 | |
62 | /* An even longer source string is truncated as well, and the total |
63 | length is returned. */ |
64 | memset (&s, '@', sizeof (s)); |
65 | strcpy (s.buf1, "Hello," ); |
66 | TEST_COMPARE (strlcat (s.buf1, " world!!!!!!!!" , sizeof (s.buf1)), 20); |
67 | TEST_COMPARE_BLOB (&s, sizeof (s), |
68 | "Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@" , 32); |
69 | |
70 | /* A destination string which is not NUL-terminated does not result |
71 | in any changes to the buffer. */ |
72 | memset (&s, '@', sizeof (s)); |
73 | memset (s.buf1, '$', sizeof (s.buf1)); |
74 | TEST_COMPARE (strlcat (s.buf1, "" , sizeof (s.buf1)), 16); |
75 | TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@" , 32); |
76 | TEST_COMPARE (strlcat (s.buf1, "Hello!" , sizeof (s.buf1)), 22); |
77 | TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@" , 32); |
78 | TEST_COMPARE (strlcat (s.buf1, "Hello, world!!!!!!!!" , sizeof (s.buf1)), 36); |
79 | TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@" , 32); |
80 | |
81 | return 0; |
82 | } |
83 | |
84 | #include <support/test-driver.c> |
85 | |