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1 | /* Copyright (C) 1991, 1992, 1995, 1996, 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> |
6dbe2837 | 20 | #include <wchar.h> |
28f540f4 RM |
21 | |
22 | ||
6dbe2837 RM |
23 | /* Common state for all non-restartable conversion functions. */ |
24 | mbstate_t __no_r_state; | |
28f540f4 RM |
25 | |
26 | /* Convert the multibyte character at S, which is no longer | |
27 | than N characters, to its `wchar_t' representation, placing | |
6dbe2837 RM |
28 | this n *PWC and returning its length. |
29 | ||
30 | Attention: this function should NEVER be intentionally used. | |
31 | The interface is completely stupid. The state is shared between | |
32 | all conversion functions. You should use instead the restartable | |
33 | version `mbrtowc'. */ | |
28f540f4 | 34 | int |
6dbe2837 | 35 | mbtowc (wchar_t *pwc, const char *s, size_t n) |
28f540f4 | 36 | { |
6dbe2837 RM |
37 | int result; |
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 | |
41 | not. This is nonsense because any multibyte encoding has a | |
42 | state. The ISO C amendment 1 corrects this while introducing the | |
43 | restartable functions. We simply say here all encodings have a | |
44 | state. */ | |
28f540f4 | 45 | if (s == NULL) |
6dbe2837 | 46 | return 1; |
28f540f4 | 47 | |
23396375 | 48 | result = __mbrtowc (pwc, s, n, &__no_r_state); |
28f540f4 | 49 | |
6dbe2837 RM |
50 | /* The `mbrtowc' functions tell us more than we need. Fold the -1 |
51 | and -2 result into -1. */ | |
52 | if (result < 0) | |
53 | result = -1; | |
28f540f4 | 54 | |
6dbe2837 | 55 | return result; |
28f540f4 | 56 | } |