NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part1/9062

Text File | 1996-08-05 | 2.9 KB | 92 lines

Path: newshost.lanl.gov!tanmoy
From: [e-mail] (Tanmoy Bhattacharya)
Newsgroups: comp.lang.c
Subject: Re: Hiding a password
Date: 05 Mar 1996 00:23:34 GMT
Organization: Los Alamos National Laboratory
Message-ID: <[e-mail]>
References: <1996Feb29.224936.137160@forest> <4he620$[e-mail]>
    <4hehmd$[e-mail]>
NNTP-Posting-Host: qcd.lanl.gov
Mime-Version: 1.0
Content-Type: text
In-reply-to: [e-mail]'s message of 4 Mar 1996 10:46:37 GMT

In article <4hehmd$[e-mail]>
[e-mail] (Fetelgeuse) writes:

<snip>
F: I wrote a function to do precisely the same thing. I made a function
F: something like:
F: char * GetString_NoEcho()
F: {
F:   char *temp;
F:   int i=1;
F:   while(temp[i-1]!=13) {
F:     temp[i-1]=getch();
F:     i++;
F:   }
F:   temp[i]=0;
F: }
F: I haven't really thought that out real well so you might find that the
F: string index is the wrong value for any given character position but that
F: would be easily fixed (if it is off, it would be off by 1 position) What
F: it should do is place the return value of a series of getch()'s
into temp[0],
F: temp[1],temp[...], until the user enters [enter] and then where enter was
F: gets replaced by a null. Anyway, like I said the indexes may be off but
F: this way works when done properly.

Please test your solutions before you post them. I tried the following
program:

#include <stdio.h>
char * GetString_NoEcho()
{
  char *temp;
  int i=1;
  while(temp[i-1]!=13) {
    temp[i-1]=getch();
    i++;
  }
  temp[i]=0;
}
int main(void) {
  char *pwd = GetString_NoEcho();
  printf("%s\n",pwd);
  return 0;
}

When I tried to compile it, I get

j.c:3: warning: function declaration isn't a prototype
j.c: In function `GetString_NoEcho':
j.c:7: warning: implicit declaration of function `getch'
j.c:4: warning: `temp' might be used uninitialized in this function
j.c:11: warning: control reaches end of non-void function
j.c: In function `main':
j.c:13: warning: `pwd' might be used uninitialized in this function
j.c:4: warning: `temp' might be used uninitialized in this function
ld: Undefined symbol
   _getch

and I get no executable.

Can you help me? Any idea what I am doing wrong? Should I change the
i-1 to i*=+5 to get it to work?

If you haven't, please remember that when you post something that is
wrong, you confuse a lot of other people. If you are merely trying to
learn, please ask questions: do not pretend to know the answer when
you don't.

Cheers
Tanmoy
--
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