NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/lang/c/19191

Text File | 1993-01-04 | 1.9 KB | 59 lines

Newsgroups: comp.lang.c
Path: sparky!uunet!munnari.oz.au!spool.mu.edu!yale.edu!ira.uka.de!math.fu-berlin.de!news.th-darmstadt.de!rbg.informatik.th-darmstadt.de!misar
From: [e-mail] (walter misar)
Subject: Re: How to read without echo.
Sender: [e-mail] (The News System)
Message-ID: <[e-mail]>
Date: Mon, 4 Jan 1993 17:29:45 GMT
References:  <[e-mail]>
Nntp-Posting-Host: rbhp60.rbg.informatik.th-darmstadt.de
Organization: TH Darmstadt
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In article <[e-mail]>, [e-mail] (Vyskocyl) writes:
> Hi!
> I got a little question, which will certainly be just a
> piece of cake for such talentuous programmers as you are.
>
> I only want to read a word on the keyboard without any
> print on the screen. I mean, I want someone to answer
> a question on his keyboard without any echo of what he
> is typing. It will end just after he pressed 'return'.
> ex: do a little program which does perform this :
>
>  What's the color of a pumpkin ? :
> (now the guy type something but it doesn't appear on
> his screen!)
>  then :
>  True! or False! whether the answer is light-blue or
> not 8-) .

Why do you guys never mention the OS you use ? (sigh)

Ok, let's assume U use Unix:
If the answer were only up to 8 bytes long, you could have
used getpass():
#include <unistd.h>
...
answerstring=getpass("What's the color of a pumpkin ?");
....

But since the answer is longer, you have to use something like this:

#include <sgtty.h>
main()
{ struct sgttyb *ttyio;
  ...
  gtty(0,ttyio);
  (ttyio->sg_flags)&=(~ECHO);    /* echo off    */
  stty(0,ttyio);
  ...   /* read without echo */
  (ttyio->sg_flags)|=(ECHO);    /* echo on    */
  stty(0,ttyio);
  .....
}

--
Walter Misar                        It is impossible to enjoy idling thoroughly
[e-mail]       unless one has plenty of work to do.