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From:	"Gustavo Niemeyer" <djgpp AT niemeyer DOT net>
To:	<djgpp AT delorie DOT com>
Subject:	RE: Dinamic allocation
Date:	Sat, 19 Jun 1999 23:41:22 -0300
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Hi Erik!!!

Thank you for your sugestion, I really didn't think
about this way! It certainly solves the problem. But
I'm still look for a way to allocate arrays with 2
or more indexes. If you find something about it,
please, let me know!

Thank you again.

Gustavo Niemeyer



-----Original Message-----
From: Erik Berglund [mailto:erik2 DOT berglund AT telia DOT com]
Sent: Sábado, 19 de Junho de 1999 22:19
To: djgpp AT delorie DOT com
Cc: erik2 DOT berglund AT telia DOT com
Subject: Re: Dinamic allocation



Gustavo Niemeyer wrote:

> char spans[MAXHEIGHT][MAXWIDTH];
>
> So the program runs ok. But when I try to
> use dinamic memory allocation like this:
>
> char **spans;
> spans = (char **) malloc(MAXWIDTH*MAXHEIGHT*sizeof(char));
>
> When I run the program it prints a General
> protection fault error, pointing to a loop
> that accesses the array.

The allocation seems right, but I think the declaration should be
"char *spans", and the data access later down below in your
program code should look something like:

data = spans[MAXWIDTH * y + x];

In this way, the compiler thinks spans is a simple char vector,
but that's ok, the multiplication will make it work anyway.

Hope this helps,
Erik

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