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From: jb10320@uxa.cso.uiuc.edu (Jawaid Bazyar)
Newsgroups: comp.sys.apple2
Subject: Re: Orca/C bug?
Message-ID: <1991May22.225351.13303@ux1.cso.uiuc.edu>
Date: 22 May 91 22:53:51 GMT
References: <9105221206.AA02966@apple.com>
Sender: usenet@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 44

HB03932@SWTEXAS.BITNET writes:
>Here is a quick little question for you "C" guys out there:
>I am finally getting around to learning "C", but I am having
>problems getting the getkey() function to work (i.e. you have
>to hit return/enter to have it "get" the first character).
>I was wondering if this is a bug in Orca/C (yeah, I have the
>original version).  Is it fixed in the upgrades.  Is there a
>way to re-define it on the version I have?

  getkey()?  There is no getkey defined as part of the C standard.
Perhaps you mean getchar()... getchar() (and in fact all of the
C I/O routines) buffer input- in this particular case, the
line you're typing.  Many systems have a way to put the I/O
routines in a 'raw' mode, so you can get single characters
at a time, but I don't believe Orca/C supports this.  
Here's a little routine that will wait for and get a character
from the keyboard (sorry, no cursor displayed- but you can
set one up by printing an inverse space).

char getkey()
{
char c = 0;

   asm {
      sep 0x20
loop:
      lda 0xE1C000
      bpl loop
      and #0x7f
      sta c
      lda 0xE1C010
      rep 0x20
   }
   return (char) c;
}

  Yes, it's assembly, but I've been using this for a couple
years with no problem.  

--
Jawaid Bazyar               |  "Twenty seven faces- with their eyes turned to
Graduated!/Comp Engineering |    the sky. I have got a camera, and an airtight
bazyar@cs.uiuc.edu          |     alibi.."
   Apple II Forever!        |  I need a job... Be privileged to pay me! :-)