Function xmlUTF8Strlen

ThirdParty/libxml2/vtklibxml2/xmlstring.c:813–843

* xmlUTF8Strlen: * @utf: a sequence of UTF-8 encoded bytes * * compute the length of an UTF8 string, it doesn't do a full UTF8 * checking of the content of the string. * * Returns the number of characters in the string or -1 in case of error */

 * Returns the number of characters in the string or -1 in case of error
 */
int
xmlUTF8Strlen(const xmlChar *utf) {
    size_t ret = 0;

    if (utf == NULL)
        return(-1);

    while (*utf != 0) {
        if (utf[0] & 0x80) {
            if ((utf[1] & 0xc0) != 0x80)
                return(-1);
            if ((utf[0] & 0xe0) == 0xe0) {
                if ((utf[2] & 0xc0) != 0x80)
                    return(-1);
                if ((utf[0] & 0xf0) == 0xf0) {
                    if ((utf[0] & 0xf8) != 0xf0 || (utf[3] & 0xc0) != 0x80)
                        return(-1);
                    utf += 4;
                } else {
                    utf += 3;
                }
            } else {
                utf += 2;
            }
        } else {
            utf++;
        }
        ret++;
    }
    return(ret > INT_MAX ? 0 : ret);
}

/**
 * xmlGetUTF8Char: