static void
htmlParseComment(htmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    int len;
    int size = HTML_PARSER_BUFFER_SIZE;
    int cur, l;
    int allow_gt;
    int dashes;
    xmlParserInputState state;

    /*
     * Check that there is a comment right here.
     */
    if ((RAW != '<') || (NXT(1) != '!') ||
        (NXT(2) != '-') || (NXT(3) != '-')) return;

    state = ctxt->instate;
    ctxt->instate = XML_PARSER_COMMENT;
    SHRINK;
    SKIP(4);
    buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
    if (buf == NULL) {
        htmlErrMemory(ctxt, "buffer allocation failed\n");
	ctxt->instate = state;
	return;
    }
    cur = CUR_CHAR(l);
    len = 0;
    allow_gt = 1;
    dashes = 0;
    while (IS_CHAR(cur) &&
	   ((cur != '>') || allow_gt)) {

	if (len + 5 >= size) {
	    xmlChar *tmp;

	    size *= 2;
	    tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
	    if (tmp == NULL) {
	        xmlFree(buf);
	        htmlErrMemory(ctxt, "growing buffer failed\n");
		ctxt->instate = state;
		return;
	    }
	    buf = tmp;
	}
	COPY_BUF(l,buf,len,cur);
	
	if (cur == '-')
	{
	    ++dashes;

	    if (dashes == 2)
	    {
		allow_gt = !allow_gt;
		dashes = 0;
		len -= 2;
	    }
	}
	else
	{
	    dashes = 0;
	}
	
	NEXTL(l);
	cur = CUR_CHAR(l);
	if (cur == 0) {
	    SHRINK;
	    GROW;
	    cur = CUR_CHAR(l);
	}
    }
    buf[len] = 0;
    if (!IS_CHAR(cur)) {
	htmlParseErr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
	             "Comment not terminated \n<!--%.50s\n", buf, NULL);
	xmlFree(buf);
    } else {
        NEXT;
	if ((ctxt->sax != NULL) && (ctxt->sax->comment != NULL) &&
	    (!ctxt->disableSAX))
	    ctxt->sax->comment(ctxt->userData, buf);
	xmlFree(buf);
    }
    ctxt->instate = state;
}