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Date:	Wed, 09 Sep 2026 20:04:19 +0300
Message-Id:	<8633vi73vw.fsf@gnu.org>
From:	"Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To:	djgpp AT delorie DOT com
In-Reply-To:	<f4f9a047-cd76-4dac-97ce-ad718b0bc41a@gmail.com>
	(djgpp AT delorie DOT com)
Subject:	Re: _go32_dpmi_meminfo libc reference errata?
References:	<f4f9a047-cd76-4dac-97ce-ad718b0bc41a AT gmail DOT com>
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> Date: Wed, 9 Sep 2026 12:27:27 -0400
> From: "Frank Sapone (emoaddict15 AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
> 
> I was running some code with -Wall -Wextra and I was using the example 
> phys_mem_left() code in your documentaiton for _go32_dpmi_meminfo 
> located at http://www.delorie.com/djgpp/doc/libc/libc_438.html
> 
> In here it mentions "The only field that is guaranteed to have useful 
> data is available_memory. Any unavailable field has -1 in it.".  The 
> compiler complained on this line from example code: if 
> (info.available_physical_pages != -1)
> 
> This makes sense because they are u_long's so therefore they cannot have 
> negative values in them.  I imagine that you want to check != 0 or is 
> the example completely incorrect?

No, the example is correct.  If the compiler complains, cast -1 to
u_long.

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