guacamole-spice-protocol/libguac/src/unicode.c
2012-07-21 12:15:59 -07:00

88 lines
2.6 KiB
C

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