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7f9f1ecb | 1 | /* Classify a domain name for IDNA purposes. |
dff8da6b | 2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
7f9f1ecb 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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
7f9f1ecb FW |
18 | |
19 | #include <errno.h> | |
20 | #include <inet/net-internal.h> | |
21 | #include <stdbool.h> | |
22 | #include <string.h> | |
23 | #include <wchar.h> | |
24 | ||
25 | enum idna_name_classification | |
26 | __idna_name_classify (const char *name) | |
27 | { | |
28 | mbstate_t mbs; | |
29 | memset (&mbs, 0, sizeof (mbs)); | |
30 | const char *p = name; | |
31 | const char *end = p + strlen (p) + 1; | |
32 | bool nonascii = false; | |
33 | bool backslash = false; | |
34 | while (true) | |
35 | { | |
36 | wchar_t wc; | |
37 | size_t result = mbrtowc (&wc, p, end - p, &mbs); | |
38 | if (result == 0) | |
39 | /* NUL terminator was reached. */ | |
40 | break; | |
41 | else if (result == (size_t) -2) | |
42 | /* Incomplete trailing multi-byte character. This is an | |
7f0d9e61 | 43 | encoding error because we received the full name. */ |
7f9f1ecb FW |
44 | return idna_name_encoding_error; |
45 | else if (result == (size_t) -1) | |
46 | { | |
47 | /* Other error, including EILSEQ. */ | |
48 | if (errno == EILSEQ) | |
49 | return idna_name_encoding_error; | |
50 | else if (errno == ENOMEM) | |
51 | return idna_name_memory_error; | |
52 | else | |
53 | return idna_name_error; | |
54 | } | |
55 | else | |
56 | { | |
57 | /* A wide character was decoded. */ | |
58 | p += result; | |
59 | if (wc == L'\\') | |
60 | backslash = true; | |
61 | else if (wc > 127) | |
62 | nonascii = true; | |
63 | } | |
64 | } | |
65 | ||
66 | if (nonascii) | |
67 | { | |
68 | if (backslash) | |
69 | return idna_name_nonascii_backslash; | |
70 | else | |
71 | return idna_name_nonascii; | |
72 | } | |
73 | else | |
74 | return idna_name_ascii; | |
75 | } |