You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: waitForValidButtonPress.m
    path of file: ./repos/GIBBON/lib
    
    the code of the file until where you have to start completion: function [k,c,b]=waitForValidButtonPress

% function [k]=waitForValidButtonPress
% ------------------------------------------------------------------------
% This function is based on the sub-function WFBP found in the |ginput|

    
function [k,c,b]=waitForValidButtonPress

% function [k]=waitForValidButtonPress
% ------------------------------------------------------------------------
% This function is based on the sub-function WFBP found in the |ginput|
% function. It is equivalent to the |waitforbuttonpress| function with the
% exection that that ^C is reserved to end the function as usual. 
%
%
% Kevin Mattheus Moerman
% kevinmoerman@hotmail.com
% 03/10/2014
%------------------------------------------------------------------------

% Disabling ^C for edit menu so the only ^C is for interrupting the function.
fig = gcf;
waserr=0;
try    
    
    h=findall(fig,'type','uimenu','accel','C');
    set(h,'accel','');
    keyDown = waitforbuttonpress;
    current_char = double(get(fig,'CurrentCharacter')); % Capturing the character.
    if~isempty(current_char) && (keyDown == 1)           % If the character was generated by the
        if(current_char == 3)                       % current keypress AND is ^C, set 'waserr'to 1
            waserr = 1;                             % so that it errors out.
        end