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394085a3 | 1 | /* Compare two binary domain names for quality. |
6d7e8eda | 2 | Copyright (C) 2022-2023 Free Software Foundation, Inc. |
394085a3 FW |
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 <arpa/nameser.h> | |
20 | #include <stdbool.h> | |
21 | ||
22 | /* Convert ASCII letters to upper case. */ | |
23 | static inline int | |
24 | ascii_toupper (unsigned char ch) | |
25 | { | |
26 | if (ch >= 'a' && ch <= 'z') | |
27 | return ch - 'a' + 'A'; | |
28 | else | |
29 | return ch; | |
30 | } | |
31 | ||
32 | bool | |
33 | __ns_samebinaryname (const unsigned char *a, const unsigned char *b) | |
34 | { | |
35 | while (*a != 0 && *b != 0) | |
36 | { | |
37 | if (*a != *b) | |
38 | /* Different label length. */ | |
39 | return false; | |
40 | int labellen = *a; | |
41 | ++a; | |
42 | ++b; | |
43 | for (int i = 0; i < labellen; ++i) | |
44 | { | |
45 | if (*a != *b && ascii_toupper (*a) != ascii_toupper (*b)) | |
46 | /* Different character in label. */ | |
47 | return false; | |
48 | ++a; | |
49 | ++b; | |
50 | } | |
51 | } | |
52 | ||
53 | /* Match if both names are at the root label. */ | |
54 | return *a == 0 && *b == 0; | |
55 | } |