| /* |
| * Copyright (C) 2001 Edmund Grimley Evans <edmundo@rano.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <stdlib.h> |
| |
| /* |
| * These functions are like the C library's mbtowc() and wctomb(), |
| * but instead of depending on the locale they always work in UTF-8, |
| * and they use int instead of wchar_t. |
| */ |
| |
| int utf8_mbtowc(int *pwc, const char *s, size_t n); |
| int utf8_wctomb(char *s, int wc); |
| |
| /* |
| * This is an object-oriented version of mbtowc() and wctomb(). |
| * The caller first uses charset_find() to get a pointer to struct |
| * charset, then uses the mbtowc() and wctomb() methods on it. |
| * The function charset_max() gives the maximum length of a |
| * multibyte character in that encoding. |
| * This API is only appropriate for stateless encodings like UTF-8 |
| * or ISO-8859-3, but I have no intention of implementing anything |
| * other than UTF-8 and 8-bit encodings. |
| * |
| * MINOR BUG: If there is no memory charset_find() may return 0 and |
| * there is no way to distinguish this case from an unknown encoding. |
| */ |
| |
| struct charset; |
| |
| struct charset *charset_find(const char *code); |
| |
| int charset_mbtowc(struct charset *charset, int *pwc, const char *s, size_t n); |
| int charset_wctomb(struct charset *charset, char *s, int wc); |
| int charset_max(struct charset *charset); |
| |
| /* |
| * Function to convert a buffer from one encoding to another. |
| * Invalid bytes are replaced by '#', and characters that are |
| * not available in the target encoding are replaced by '?'. |
| * Each of TO and TOLEN may be zero if the result is not wanted. |
| * The input or output may contain null bytes, but the output |
| * buffer is also null-terminated, so it is all right to |
| * use charset_convert(fromcode, tocode, s, strlen(s), &t, 0). |
| * |
| * Return value: |
| * |
| * -2 : memory allocation failed |
| * -1 : unknown encoding |
| * 0 : data was converted exactly |
| * 1 : valid data was converted approximately (using '?') |
| * 2 : input was invalid (but still converted, using '#') |
| */ |
| |
| int charset_convert(const char *fromcode, const char *tocode, |
| const char *from, size_t fromlen, |
| char **to, size_t *tolen); |