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Full Discussion: Clumsy user input
Top Forums UNIX for Dummies Questions & Answers Clumsy user input Post 302930988 by darwin_886 on Friday 9th of January 2015 08:07:18 AM
Old 01-09-2015
Clumsy user input
The (longer) script that I am working on does something like this:
Code:
#!/bin/bash

while true
do
   clear
   sleep 1
   shuf -i1-2 -n1    
   sleep .1
   clear
   echo "Press 1 if you saw a 1. Press 2 if you saw a 2."
   read -s -n1 RESPONSE
done

If the user accidentally presses two keys non-simultaneously (e.g., fat finger hits 1 then 2), then the second keypress gets assigned to RESPONSE on the next iteration of the loop. How can I avoid this (e.g., flushing any extra keypresses from stdin at the end of the loop)? I don't need to give the user the opportunity to redo - just taking the first keypress as response is fine.
 

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keyboard_translatekeys

keyboard_translatekeys(3)					Svgalib User Manual					 keyboard_translatekeys(3)

NAME

       keyboard_translatekeys - modify scancode mappings in raw keyboard mode

SYNOPSIS

       #include <vgakeyboard.h>

       void keyboard_translatekeys(int mask);

DESCRIPTION

       This function sets several flags which control how certain scancodes are mapped. At startup a mask value of 0 is active.

       mask must be a logical or of zero or more of the following #predefined integers to turn the features listed on:

       TRANSLATE_CURSORKEYS
	      Translate  the scancodes of the SCANCODE_CURSORBLOCK* keys to those of the cursor keys on the number pad, s.t.  keyboard_getstate(3)
	      and keyboard_keypressed(3) report a keypress of the corresponding number pad cursor key and not the one on the cursor block.

       TRANSLATE_DIAGONAL
	      Translates the scancodes of diagonal cursor keys (keypad 7, 9, 1, 3) to presses of two of the ordinary up, down, left,  right  keys.
	      For  example, instead of reporting a press of SCANCODE_CURSORUPRIGHT keyboard_getstate(3) and keyboard_keypressed(3) report a simul-
	      taneous press of SCANCODE_CURSORUP and SCANCODE_CURSORRIGHT.

       TRANSLATE_KEYPADENTER
	      The scancode of the keypad enter key is mapped to that of the ordinary  enter  key,  s.t.   keyboard_getstate(3)	and  keyboard_key-
	      pressed(3) report a press of SCANCODE_ENTER regardless if keypad enter or ordinary enter is pressed.

       DONT_CATCH_CTRLC
	      Pressing	<Ctrl>-C  does not raise a SIGINT.  On contrary to the other flags this has also effect when a user defined keyboard event
	      handler is used. Svgalib will always process <Alt>-F1 - <Alt>-F10 and perform console switches accordingly.

BUGS

       The TRANSLATE_* options above do really do simple scancode translations. For example, when TRANSLATE_KEYPADENTER is  active  and  the  user
       presses both enter and keypad enter. Then, if he releases one of them (say keypad enter), it's release event will clear the common keyboard
       state, s.t.  no keypress is reported even though enter is still pressed.

       Similarly, if TRANSLATE_DIAGONAL is active, the user holds cursor upleft (keypad 7) down and then presses and release cursor up (keypad 8),
       svgalib	will  only report a pressed cursor left but the simulated cursor up will be lost. You can easily try this with the keytest(6) demo
       to make the effect more clear to you.

SEE ALSO

       svgalib(7),    vgagl(7),    libvga.config(5),	keytest(6),    eventtest(6),	keyboard_seteventhandler(3),	keyboard_init(3),     key-
       board_init_return_fd(3),   keyboard_close(3),   keyboard_update(3),   keyboard_waitforupdate(3),  keyboard_setdefaulteventhandler(3),  key-
       board_getstate(3), keyboard_clearstate(3), keyboard_keypressed(3), vga_waitevent(3)

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced function as well as of the
       original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally  this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections
       to this first version of the svgalib manual.

Svgalib (>;= 1.2.11)						   29 July 1997 					 keyboard_translatekeys(3)
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