未知的ansi转义码-）0 [，？7h和？7l

Question

So I'm seeing some ANSI escape codes I'm unfamiliar with in some output.

\\x1B)0[
\\x1B[?7h
\\x1B[?7l

http://ascii-table.com/ansi-escape-sequences.php says that \\\\x1B[=7h and \\\\x1B[=7l will set and reset (respectively) the mode to enable line wrapping but those have ='s and not ?'s so idk how applicable that is.

Any ideas?

Answer 1

The first \\\\x1B)0 (if not misquoted) could be one of the character-set controls:

        C = 0  -> DEC Special Character and Line Drawing Set.
....
ESC ) C   Designate G1 Character Set (ISO 2022, VT100).
          The same character sets apply as for ESC ( C.

The ? indicates a private mode setting. ISO-6429 ( ECMA-48 ) defines four: < , > , ? and = . The corresponding mode (still quoting XTerm Control Sequences ):

CSI ? Pm h
      DEC Private Mode Set (DECSET).
...
        Ps = 7  -> Wraparound Mode (DECAWM).

The application is supposed to pause briefly between changing this between reverse-video and back to the normal state.