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