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96310297 | 1 | /* Copyright (C) 1991,1997,1998,1999,2000,2002 Free Software Foundation, Inc. |
7cc27f44 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
7cc27f44 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
28f540f4 | 18 | |
28f540f4 | 19 | #include <stdlib.h> |
9f097308 | 20 | #include <string.h> |
af6f3906 | 21 | #include <wchar.h> |
9ce5071a UD |
22 | #include <gconv.h> |
23 | #include <wcsmbs/wcsmbsload.h> | |
28f540f4 RM |
24 | |
25 | ||
9f097308 UD |
26 | /* Internal state. */ |
27 | static mbstate_t state; | |
28 | ||
28f540f4 | 29 | /* Return the length of the multibyte character (if there is one) |
af6f3906 UD |
30 | at S which is no longer than N characters. |
31 | The ISO C standard says that the `mblen' function must not change | |
9f097308 | 32 | the state of the `mbtowc' function. */ |
28f540f4 | 33 | int |
7cc27f44 | 34 | mblen (const char *s, size_t n) |
28f540f4 | 35 | { |
af6f3906 UD |
36 | int result; |
37 | ||
38 | /* If S is NULL the function has to return null or not null | |
39 | depending on the encoding having a state depending encoding or | |
9ce5071a | 40 | not. */ |
af6f3906 | 41 | if (s == NULL) |
9ce5071a | 42 | { |
96310297 RM |
43 | const struct gconv_fcts *fcts; |
44 | ||
45 | /* Get the conversion functions. */ | |
46 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
9ce5071a | 47 | |
9f097308 UD |
48 | /* Reset the state. */ |
49 | memset (&state, '\0', sizeof state); | |
50 | ||
96310297 | 51 | result = fcts->towc->__stateful; |
9ce5071a | 52 | } |
8619129f | 53 | else if (*s == '\0') |
9f097308 | 54 | /* According to the ISO C 89 standard this is the expected behaviour. */ |
8619129f UD |
55 | result = 0; |
56 | else | |
57 | { | |
b837918e | 58 | memset (&state, '\0', sizeof state); |
8619129f UD |
59 | |
60 | result = __mbrtowc (NULL, s, n, &state); | |
61 | ||
62 | /* The `mbrtowc' functions tell us more than we need. Fold the -1 | |
63 | and -2 result into -1. */ | |
64 | if (result < 0) | |
65 | result = -1; | |
66 | } | |
af6f3906 UD |
67 | |
68 | return result; | |
28f540f4 | 69 | } |