ESCAPE_ANY
#define ESCAPE_ANY_NP (ESCAPE_ANY | ESCAPE_NP)
seq_escape_str(s, src, ESCAPE_ANY | ESCAPE_NAP | ESCAPE_APPEND, "\"\\")
.flags = ESCAPE_ANY | ESCAPE_APPEND,
.flags = ESCAPE_ANY | ESCAPE_APPEND,
.flags = ESCAPE_ANY | ESCAPE_NA,
.flags = ESCAPE_ANY | ESCAPE_NAP,
flags |= ESCAPE_ANY;