seq_escape_str
seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
seq_escape_str(m, s, ESCAPE_OCTAL, esc);
seq_escape_str(s, src, ESCAPE_ANY | ESCAPE_NAP | ESCAPE_APPEND, "\"\\")
seq_escape_str(m, dp->format, ESCAPE_SPACE, "\t\r\n\"");