* Unbuffered line input and the GNU library
@ 2002-08-19 19:24 Steve Dondley
2002-08-19 20:36 ` Ish Rattan
0 siblings, 1 reply; 3+ messages in thread
From: Steve Dondley @ 2002-08-19 19:24 UTC (permalink / raw)
To: gcc-help
I'm new to C, learning from a beginner's book. The book mentions in passing
that unbuffered line input can be accomplished with the non-standard getch()
function. However, I did a grep on every *.h file on my computer and wasn't
able to locate the function's declaration. A message in this list's archive
hinted that getch() might be in the 'ncurses', 'curses', or 'termcap' header
files. However, these don't seem to exist in my library either. I looked
on the web for some kind of documentation for getch() and that proved
fruitless as well. So I have some basic questions:
1) Where are all the GNU C library functions documented?
2) Where can I download the GNU C library functions from and how do I
install them? I tried 'apt-get install ncurses' but I got some funky
message about ncurses being obsoleted or not available.
3) If I'm going in the wrong direction, my question is: How do you perform
unbuffered line input with the GNU C library.
I'm running Debian/Woody, GCC version 2.95.4 (Debian prerelease).
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Unbuffered line input and the GNU library
2002-08-19 19:24 Unbuffered line input and the GNU library Steve Dondley
@ 2002-08-19 20:36 ` Ish Rattan
2002-08-20 11:20 ` Claudio Bley
0 siblings, 1 reply; 3+ messages in thread
From: Ish Rattan @ 2002-08-19 20:36 UTC (permalink / raw)
To: gcc-help
On Mon, 19 Aug 2002, Steve Dondley wrote:
> function. However, I did a grep on every *.h file on my computer and wasn't
It is a macro defined in /usr/include/stdio.h
-ishwar
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Unbuffered line input and the GNU library
2002-08-19 20:36 ` Ish Rattan
@ 2002-08-20 11:20 ` Claudio Bley
0 siblings, 0 replies; 3+ messages in thread
From: Claudio Bley @ 2002-08-20 11:20 UTC (permalink / raw)
To: Ish Rattan; +Cc: gcc-help
>>>>> "Ish" == Ish Rattan <ishwar@pali.cps.cmich.edu> writes:
Ish> On Mon, 19 Aug 2002, Steve Dondley wrote:
>> function. However, I did a grep on every *.h file on my
>> computer and wasn't
Ish> It is a macro defined in /usr/include/stdio.h
I can't find it there (glibc 2.2.5 Debian GNU/Linux). What's the
version of your C library that you're using?
Usually, in order to get unbuffered line input you need to switch the
terminal to unbufferd input mode (and properly restore it when done -
I guess this wouldn't work with a simple macro; I'd really like to see
the macro if it really is there).
Here's some code I used for this purpose:
,----
| struct termios tio_orig;
| struct termios tio_new;
|
| tcgetattr(0, &tio_orig);
|
| tio_new = tio_orig;
| tio_new.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
| tcsetattr(0,TCSANOW,&tio_new);
|
| /* ... */
|
| tcsetattr(0,TCSANOW,&tio_orig);
`----
Cheers.
--
Claudio Bley _
ASCII ribbon campaign ( )
ICQ# 83197241 - against HTML email X
http://www.cs.uni-magdeburg.de/~bley/ & vCards / \
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2002-08-19 19:24 Unbuffered line input and the GNU library Steve Dondley
2002-08-19 20:36 ` Ish Rattan
2002-08-20 11:20 ` Claudio Bley
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