On 12 Feb 2023, at 11:47, Alessio Stalla alessiostalla@gmail.com wrote:
Greetings everyone,
is there a well-known way to do the thing in the subject, i.e. ask the user for a password in a console application, reading from the keyboard without echoing anything to the terminal? Using a library is fine, SBCL only is fine, limited to some OS is not so fine but better than nothing. Any idea?
Here’s something that I’ve used for Lispworks and SBCL:
#+sbcl (require :sb-posix)
#+sbcl (defun echo-off () (let ((tm (sb-posix:tcgetattr sb-sys:*tty*))) (setf (sb-posix:termios-lflag tm) (logandc2 (sb-posix:termios-lflag tm) sb-posix:echo)) (sb-posix:tcsetattr sb-sys:*tty* sb-posix:tcsanow tm)))
#+sbcl (defun echo-on () (let ((tm (sb-posix:tcgetattr sb-sys:*tty*))) (setf (sb-posix:termios-lflag tm) (logior (sb-posix:termios-lflag tm) sb-posix:echo)) (sb-posix:tcsetattr sb-sys:*tty* sb-posix:tcsanow tm)))
#+sbcl (defun prompt-for-value (prompt) (format t "~&~a " prompt) (force-output) (read-line))
#+sbcl (defun prompt-for-value/no-echo (prompt) (format t "~&~a " prompt) (force-output) (echo-off) (unwind-protect (read-line) (echo-on)))
#+capi (defun prompt-for-value (prompt) (capi:prompt-for-string prompt))
#+capi (defun prompt-for-value/no-echo (prompt) (capi:prompt-for-string prompt :pane-class 'capi:password-pane))
(defun get-passphrase-from-user () (prompt-for-value/no-echo "Passphrase?"))