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1 | /* Copyright (C) 1991-2024 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <stdlib.h> | |
19 | #include <string.h> | |
20 | #include <wchar.h> | |
21 | #include <gconv.h> | |
22 | #include <wcsmbs/wcsmbsload.h> | |
23 | ||
24 | ||
25 | /* Internal state. */ | |
26 | static mbstate_t state; | |
27 | ||
28 | /* Return the length of the multibyte character (if there is one) | |
29 | at S which is no longer than N characters. | |
30 | The ISO C standard says that the `mblen' function must not change | |
31 | the state of the `mbtowc' function. */ | |
32 | int | |
33 | mblen (const char *s, size_t n) | |
34 | { | |
35 | int result; | |
36 | ||
37 | /* If S is NULL the function has to return null or not null | |
38 | depending on the encoding having a state depending encoding or | |
39 | not. */ | |
40 | if (s == NULL) | |
41 | { | |
42 | const struct gconv_fcts *fcts; | |
43 | ||
44 | /* Get the conversion functions. */ | |
45 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
46 | ||
47 | /* Reset the state. */ | |
48 | memset (&state, '\0', sizeof state); | |
49 | ||
50 | result = fcts->towc->__stateful; | |
51 | } | |
52 | else if (*s == '\0') | |
53 | /* According to the ISO C 89 standard this is the expected behaviour. */ | |
54 | result = 0; | |
55 | else | |
56 | { | |
57 | memset (&state, '\0', sizeof state); | |
58 | ||
59 | result = __mbrtowc (NULL, s, n, &state); | |
60 | ||
61 | /* The `mbrtowc' functions tell us more than we need. Fold the -1 | |
62 | and -2 result into -1. */ | |
63 | if (result < 0) | |
64 | result = -1; | |
65 | } | |
66 | ||
67 | return result; | |
68 | } |