]>
Commit | Line | Data |
---|---|---|
7cc27f44 UD |
1 | /* Copyright (C) 1991, 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
28f540f4 | 3 | |
7cc27f44 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
7cc27f44 UD |
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 | Library General Public License for more details. | |
28f540f4 | 13 | |
7cc27f44 UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
28f540f4 | 19 | #include <stdlib.h> |
af6f3906 | 20 | #include <wchar.h> |
28f540f4 RM |
21 | |
22 | ||
23 | /* Return the length of the multibyte character (if there is one) | |
af6f3906 UD |
24 | at S which is no longer than N characters. |
25 | The ISO C standard says that the `mblen' function must not change | |
26 | the global state. */ | |
28f540f4 | 27 | int |
7cc27f44 | 28 | mblen (const char *s, size_t n) |
28f540f4 | 29 | { |
af6f3906 UD |
30 | mbstate_t state; |
31 | int result; | |
32 | ||
33 | /* If S is NULL the function has to return null or not null | |
34 | depending on the encoding having a state depending encoding or | |
35 | not. This is nonsense because any multibyte encoding has a | |
36 | state. The ISO C amendment 1 corrects this while introducing the | |
37 | restartable functions. We simply say here all encodings have a | |
38 | state. */ | |
39 | if (s == NULL) | |
40 | return 1; | |
41 | ||
42 | state.count = 0; | |
43 | state.value = 0; | |
44 | ||
45 | result = __mbrtowc (NULL, s, n, &state); | |
46 | ||
47 | /* The `mbrtowc' functions tell us more than we need. Fold the -1 | |
48 | and -2 result into -1. */ | |
49 | if (result < 0) | |
50 | result = -1; | |
51 | ||
52 | return result; | |
28f540f4 | 53 | } |