| 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 */ |