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688903eb | 1 | /* Copyright (C) 1991-2018 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 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 | 18 | #include <stdlib.h> |
53308042 | 19 | #include <string.h> |
6dbe2837 | 20 | #include <wchar.h> |
9ce5071a UD |
21 | #include <gconv.h> |
22 | #include <wcsmbs/wcsmbsload.h> | |
28f540f4 RM |
23 | |
24 | ||
28f540f4 RM |
25 | /* Convert the multibyte character at S, which is no longer |
26 | than N characters, to its `wchar_t' representation, placing | |
6dbe2837 RM |
27 | this n *PWC and returning its length. |
28 | ||
29 | Attention: this function should NEVER be intentionally used. | |
30 | The interface is completely stupid. The state is shared between | |
31 | all conversion functions. You should use instead the restartable | |
32 | version `mbrtowc'. */ | |
28f540f4 | 33 | int |
6dbe2837 | 34 | mbtowc (wchar_t *pwc, const char *s, size_t n) |
28f540f4 | 35 | { |
6dbe2837 | 36 | int result; |
1e99aede | 37 | static mbstate_t state; |
6dbe2837 RM |
38 | |
39 | /* If S is NULL the function has to return null or not null | |
40 | depending on the encoding having a state depending encoding or | |
9ce5071a | 41 | not. */ |
28f540f4 | 42 | if (s == NULL) |
9ce5071a | 43 | { |
96310297 RM |
44 | const struct gconv_fcts *fcts; |
45 | ||
46 | /* Get the conversion functions. */ | |
47 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
9ce5071a | 48 | |
9f097308 UD |
49 | /* This is an extension in the Unix standard which does not directly |
50 | violate ISO C. */ | |
1e99aede | 51 | memset (&state, '\0', sizeof state); |
9f097308 | 52 | |
96310297 | 53 | result = fcts->towc->__stateful; |
9ce5071a | 54 | } |
8619129f UD |
55 | else if (*s == '\0') |
56 | { | |
57 | if (pwc != NULL) | |
58 | *pwc = L'\0'; | |
59 | result = 0; | |
60 | } | |
61 | else | |
62 | { | |
1e99aede | 63 | result = __mbrtowc (pwc, s, n, &state); |
28f540f4 | 64 | |
8619129f UD |
65 | /* The `mbrtowc' functions tell us more than we need. Fold the -1 |
66 | and -2 result into -1. */ | |
67 | if (result < 0) | |
68 | result = -1; | |
69 | } | |
28f540f4 | 70 | |
6dbe2837 | 71 | return result; |
28f540f4 | 72 | } |