forked from enlightenment/efl
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
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/* EINA - EFL data type library
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* Copyright (C) 2013 Cedric Bail
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "eina_config.h"
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#include "eina_private.h"
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#include "eina_safety_checks.h"
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#if EINA_SIZEOF_WCHAR_T >= 4
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# include <wchar.h>
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typedef wchar_t Eina_Unicode;
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#else
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# include <inttypes.h>
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typedef uint32_t Eina_Unicode;
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#endif
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EAPI Eina_Unicode
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_eina_unicode_utf8_get_next(int ind,
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unsigned char d,
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const char *buf,
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int *iindex);
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#define ERROR_REPLACEMENT_BASE 0xDC80
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#define EINA_IS_INVALID_BYTE(x) ((x == 192) || (x == 193) || (x >= 245))
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#define EINA_IS_CONTINUATION_BYTE(x) ((x & 0xC0) == 0x80)
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EAPI Eina_Unicode eina_unicode_utf8_get_next(const char *buf, int *iindex)
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{
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int ind;
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Eina_Unicode r;
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unsigned char d;
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EINA_SAFETY_ON_NULL_RETURN_VAL(buf, 0);
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EINA_SAFETY_ON_NULL_RETURN_VAL(iindex, 0);
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ind = *iindex;
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/* if this char is the null terminator, exit */
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if ((d = buf[ind++]) == 0) return 0;
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if ((d & 0x80) == 0)
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{ // 1 byte (7bit) - 0xxxxxxx
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*iindex = ind;
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return d;
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}
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if ((d & 0xe0) == 0xc0)
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{ // 2 byte (11bit) - 110xxxxx 10xxxxxx
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r = (d & 0x1f) << 6;
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if (((d = buf[ind++]) == 0) || EINA_IS_INVALID_BYTE(d) ||
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!EINA_IS_CONTINUATION_BYTE(d)) goto error;
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r |= (d & 0x3f);
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if (r <= 0x7F) goto error;
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*iindex = ind;
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return r;
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}
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return _eina_unicode_utf8_get_next(ind, d, buf, iindex);
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/* Gets here where there was an error and we want to replace the char
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* we just use the invalid unicode codepoints 8 lower bits represent
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* the original char */
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error:
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d = buf[*iindex];
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(*iindex)++;
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return ERROR_REPLACEMENT_BASE | d;
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}
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