Function xmlURIEscapeStr

ThirdParty/libxml2/vtklibxml2/uri.c:1676–1731

* xmlURIEscapeStr: * @str: string to escape * @list: exception list string of chars not to escape * * This routine escapes a string to hex, ignoring unreserved characters * a-z, A-Z, 0-9, "-._~", a few sub-delims "!*'()", the gen-delim "@" * (why?) and the characters in the exception list. * * Returns a new escaped string or NULL in case of error. */

 * Returns a new escaped string or NULL in case of error.
 */
xmlChar *
xmlURIEscapeStr(const xmlChar *str, const xmlChar *list) {
    xmlChar *ret, ch;
    xmlChar *temp;
    const xmlChar *in;
    int len, out;

    if (str == NULL)
	return(NULL);
    if (str[0] == 0)
	return(xmlStrdup(str));
    len = xmlStrlen(str);

    len += 20;
    ret = (xmlChar *) xmlMallocAtomic(len);
    if (ret == NULL)
	return(NULL);
    in = (const xmlChar *) str;
    out = 0;
    while(*in != 0) {
	if (len - out <= 3) {
            if (len > INT_MAX / 2)
                return(NULL);
            temp = xmlRealloc(ret, len * 2);
	    if (temp == NULL) {
		xmlFree(ret);
		return(NULL);
	    }
	    ret = temp;
            len *= 2;
	}

	ch = *in;

	if ((ch != '@') && (!IS_UNRESERVED(ch)) && (!xmlStrchr(list, ch))) {
	    unsigned char val;
	    ret[out++] = '%';
	    val = ch >> 4;
	    if (val <= 9)
		ret[out++] = '0' + val;
	    else
		ret[out++] = 'A' + val - 0xA;
	    val = ch & 0xF;
	    if (val <= 9)
		ret[out++] = '0' + val;
	    else
		ret[out++] = 'A' + val - 0xA;
	    in++;
	} else {
	    ret[out++] = *in++;
	}

    }
    ret[out] = 0;
    return(ret);
}

/**