support comments in dsn files

                goto exit;

            }

            cur = next;

        }

            cur = start;

            // skip leading whitespace

            while( cur<limit && isspace(*cur) )

                ++cur;

            // if the first non-blank character is #, this line is a comment.

            if( cur<limit && *cur=='#' )

                goto L_read;

        }

        else

        {

            // skip leading whitespace

            while( cur<limit && isspace(*cur) )

                ++cur;

        }

        if( cur >= limit )

            goto L_read;