ESCAPE_APPEND
seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
seq_escape_str(s, src, ESCAPE_ANY | ESCAPE_NAP | ESCAPE_APPEND, "\"\\")
bool is_append = flags & ESCAPE_APPEND;
.flags = ESCAPE_ANY | ESCAPE_APPEND,
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NAP,
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NA,
.flags = ESCAPE_ANY | ESCAPE_APPEND,
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,
if (flags & ESCAPE_NA && !(flags & ESCAPE_APPEND && esc)) {