| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1991-2016 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 | <http://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 | /* Convert the multibyte character at S, which is no longer |
| 26 | than N characters, to its `wchar_t' representation, placing |
| 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'. */ |
| 33 | int |
| 34 | mbtowc (wchar_t *pwc, const char *s, size_t n) |
| 35 | { |
| 36 | int result; |
| 37 | static mbstate_t state; |
| 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. */ |
| 42 | if (s == NULL) |
| 43 | { |
| 44 | const struct gconv_fcts *fcts; |
| 45 | |
| 46 | /* Get the conversion functions. */ |
| 47 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); |
| 48 | |
| 49 | /* This is an extension in the Unix standard which does not directly |
| 50 | violate ISO C. */ |
| 51 | memset (&state, '\0', sizeof state); |
| 52 | |
| 53 | result = fcts->towc->__stateful; |
| 54 | } |
| 55 | else if (*s == '\0') |
| 56 | { |
| 57 | if (pwc != NULL) |
| 58 | *pwc = L'\0'; |
| 59 | result = 0; |
| 60 | } |
| 61 | else |
| 62 | { |
| 63 | result = __mbrtowc (pwc, s, n, &state); |
| 64 | |
| 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 | } |
| 70 | |
| 71 | return result; |
| 72 | } |