ISO/IEC 2022 defines the C0 and C1 control codes. The C0 set are the familiar codes between 0x00
and 0x1f
in ASCII, ISO-8859-1 and UTF-8 (eg. ESC, CR, LF).
Some VT100 terminal emulators (eg. screen(1)
, PuTTY) support the C1 set, too. These are the values between 0x80
and 0x9f
(so, for example, 0x84
moves the cursor down a line).
I am displaying user-supplied input. I do not wish the user input to be able to alter the terminal state (eg. move the cursor). I am currently filtering out the character codes in the C0 set; however I would like to conditionally filter out the C1 set too, if terminal will interpret them as control codes.
Is there a way of getting this information from a database like termcap
?