ce188d4d |
1 | /* |
2 | * Copyright (C) 2001 Edmund Grimley Evans <edmundo@rano.org> |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by |
6 | * the Free Software Foundation; either version 2 of the License, or |
7 | * (at your option) any later version. |
8 | * |
9 | * This program 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 |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
17 | */ |
18 | |
19 | #include <stdlib.h> |
20 | |
21 | /* |
22 | * These functions are like the C library's mbtowc() and wctomb(), |
23 | * but instead of depending on the locale they always work in UTF-8, |
24 | * and they use int instead of wchar_t. |
25 | */ |
26 | |
27 | int utf8_mbtowc(int *pwc, const char *s, size_t n); |
28 | int utf8_wctomb(char *s, int wc); |
29 | |
30 | /* |
31 | * This is an object-oriented version of mbtowc() and wctomb(). |
32 | * The caller first uses charset_find() to get a pointer to struct |
33 | * charset, then uses the mbtowc() and wctomb() methods on it. |
34 | * The function charset_max() gives the maximum length of a |
35 | * multibyte character in that encoding. |
36 | * This API is only appropriate for stateless encodings like UTF-8 |
37 | * or ISO-8859-3, but I have no intention of implementing anything |
38 | * other than UTF-8 and 8-bit encodings. |
39 | * |
40 | * MINOR BUG: If there is no memory charset_find() may return 0 and |
41 | * there is no way to distinguish this case from an unknown encoding. |
42 | */ |
43 | |
44 | struct charset; |
45 | |
46 | struct charset *charset_find(const char *code); |
47 | |
48 | int charset_mbtowc(struct charset *charset, int *pwc, const char *s, size_t n); |
49 | int charset_wctomb(struct charset *charset, char *s, int wc); |
50 | int charset_max(struct charset *charset); |
51 | |
52 | /* |
53 | * Function to convert a buffer from one encoding to another. |
54 | * Invalid bytes are replaced by '#', and characters that are |
55 | * not available in the target encoding are replaced by '?'. |
56 | * Each of TO and TOLEN may be zero if the result is not wanted. |
57 | * The input or output may contain null bytes, but the output |
58 | * buffer is also null-terminated, so it is all right to |
59 | * use charset_convert(fromcode, tocode, s, strlen(s), &t, 0). |
60 | * |
61 | * Return value: |
62 | * |
63 | * -2 : memory allocation failed |
64 | * -1 : unknown encoding |
65 | * 0 : data was converted exactly |
66 | * 1 : valid data was converted approximately (using '?') |
67 | * 2 : input was invalid (but still converted, using '#') |
68 | */ |
69 | |
70 | int charset_convert(const char *fromcode, const char *tocode, |
71 | const char *from, size_t fromlen, |
72 | char **to, size_t *tolen); |