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add kbhit() #438

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Sep 21, 2017
Merged

add kbhit() #438

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32 changes: 32 additions & 0 deletions irteus/irtutil.l
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Original file line number Diff line number Diff line change
Expand Up @@ -566,6 +566,38 @@ t
)
,flag))))


;;; from termbits.h
(defcstruct termios
(c_iflag :integer)
(c_oflag :integer)
(c_cflag :integer)
(c_lflag :integer)
(c_line :char)
(c_cc :char 19)
(c_ispeed :integer)
(c_ospeed :integer))

(defconstant TCSANOW 0)
(defconstant TCSADRAIN 1)
(defconstant TCSAFLUSH 2)
(defconstant ICANON #0x0002)
(defun kbhit ()
"Checks the console for a keystroke. retuns keycode value if a key has been pressed, otherwise it returns nil. Note that this does not work well on Emacs Shell mode, run EusLisp program from terminal shell."
(let ((attr-orig (unix::tcgetattr 0))
(buf "0")
attr ret)
(setq attr (copy-list attr-orig))
;; 1000 1010 0011 1011
(setf (termios-c_lflag attr) (logand (termios-c_lflag attr) (lognot ICANON)))
(unix::tcsetattr 0 TCSANOW attr)
(when (= (unix::select-read-fd 1 0.001) 1)
(unix::uread 0 buf 1)
(setq ret (elt buf 0)))
(unix::tcsetattr 0 TCSANOW attr-orig)
ret))
;;

;; piped fork returning result as list
(defun piped-fork-returns-list (cmd &optional args)
"piped fork returning result as list"
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