ESCAPE_HEX
seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
if (flags & ESCAPE_HEX && escape_hex(c, &p, end))
const int flags = ESCAPE_HEX;
.flags = ESCAPE_SPACE | ESCAPE_HEX,
.flags = ESCAPE_SPECIAL | ESCAPE_HEX,
.flags = ESCAPE_NP | ESCAPE_HEX,
.flags = ESCAPE_HEX | ESCAPE_NA,
.flags = ESCAPE_HEX,
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NAP,
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NA,
.flags = ESCAPE_HEX | ESCAPE_NA,
.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NA,
.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,
.flags = ESCAPE_HEX | ESCAPE_NAP,
.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NAP,
.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,
flags &= ~ESCAPE_HEX;
flags |= ESCAPE_HEX;