88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stddef.h>
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#include "unicode.h"
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size_t guac_utf8_charsize(unsigned char c) {
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/* Determine size in bytes of character */
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if ((c >>= 1) == 0x7E) return 6;
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if ((c >>= 1) == 0x3E) return 5;
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if ((c >>= 1) == 0x1E) return 4;
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if ((c >>= 1) == 0x0E) return 3;
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if ((c >>= 1) == 0x06) return 2;
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/* Default to one character */
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return 1;
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}
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size_t guac_utf8_strlen(const char* str) {
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/* The current length of the string */
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int length = 0;
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/* Number of characters before start of next character */
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int skip = 0;
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while (*str != 0) {
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/* If skipping, then skip */
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if (skip > 0) skip--;
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/* Otherwise, determine next skip value, and increment length */
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else {
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/* Get next character */
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unsigned char c = (unsigned char) *str;
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/* Determine skip value (size in bytes of rest of character) */
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skip = guac_utf8_charsize(c) - 1;
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length++;
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}
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str++;
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}
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return length;
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}
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