From:	tom burgess <tburgess AT drao DOT nrc DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: I have a question for Allegro. I really hope someonce can answer it!!!!
Date:	Sun, 01 Mar 1998 02:44:44 -0800
Organization:	BCTEL Advanced Communications
Lines:	27
Message-ID:	<34F93C1C.2FA7@drao.nrc.ca>
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Oren Marciano wrote:
> 
> What does this code actually do:
> 
>  xgrid = MID(1, atoi(griddle_xgrid), 0xFFFF);
> 
> xgrid is an int
> griddle_xgrid is a char
> 
> what is MID, what is atoi, why is the last parimater 0xFFFF
> 
> This is taken from the Allegro Grabber code.
> 
> If anyone can answer this I would appreciate it.

MID is defined in allegro.h and is being used to clip the grid value to
within the range 1 - 65535 (0xFFFF). atoi is a standard C function
(Ascii TO Integer) which converts a string to int.
You will find allegro.h in DJGPP\INCLUDE. Here's the Allegro def.

#ifndef MIN
#define MIN(x,y)     (((x) < (y)) ? (x) : (y))
#define MAX(x,y)     (((x) > (y)) ? (x) : (y))
#define MID(x,y,z)   MAX((x), MIN((y), (z)))
#endif

	regards, tom

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