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 | #ifdef HAVE_CONFIG_H |
20 | # include <config.h> |
21 | #endif |
22 | |
23 | #ifdef HAVE_ICONV |
24 | |
25 | /* |
26 | * Convert data from one encoding to another. Return: |
27 | * |
28 | * -2 : memory allocation failed |
29 | * -1 : unknown encoding |
30 | * 0 : data was converted exactly |
31 | * 1 : data was converted inexactly |
32 | * 2 : data was invalid (but still converted) |
33 | * |
34 | * We convert in two steps, via UTF-8, as this is the only |
35 | * reliable way of distinguishing between invalid input |
36 | * and valid input which iconv refuses to transliterate. |
37 | * We convert from UTF-8 twice, because we have no way of |
38 | * knowing whether the conversion was exact if iconv returns |
39 | * E2BIG (due to a bug in the specification of iconv). |
40 | * An alternative approach is to assume that the output of |
41 | * iconv is never more than 4 times as long as the input, |
42 | * but I prefer to avoid that assumption if possible. |
43 | */ |
44 | |
45 | int iconvert(const char *fromcode, const char *tocode, |
46 | const char *from, size_t fromlen, |
47 | char **to, size_t *tolen) ; |
48 | |
49 | #endif /* HAVE_ICONV */ |