Date: Sat, 12 Aug 2000 21:40:00 +1000 (EST) From: Iain Templeton <iain@research.canon.com.au> To: andrew@ugh.net.au Cc: freebsd-hackers@freebsd.org Subject: Re: libvgl: free(): warning: junk pointer, too high to make sense. Message-ID: <Pine.SOL.4.10.10008122135290.502-100000@elph.research.canon.com.au> In-Reply-To: <Pine.BSF.4.21.0008122101560.47329-100000@starbug.ugh.net.au>
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On Sat, 12 Aug 2000 andrew@ugh.net.au wrote:
> Hi,
>
Hi Andrew :-)
> I'm using libvgl but when I call VGLTextSetFontFile(FONT) I get:
>
> free(): warning: junk pointer, too high to make sense.
>
> What am I doing wrong? The only other vgl call I have made at this point
> is VGLInit.
>
Well, VGLInit() calls VGLTextSetFontFile((byte *)0)
We see in VGLTextSetFontFile() that
if (filename==NULL) {
VGLTextFont->Width = 8;
VGLTextFont->Height = 8;
VGLTextFont->BitmapArray = VGLFont;
}
But I think that when you call VGLTextSetFontFile() later you'll run the
code at the beginning of the function
if (VGLTextFont) {
if (VGLTextFont->BitmapArray)
free (VGLTextFont->BitmapArray); <--- This Line
free(VGLTextFont);
}
So what I suspect might be happening is that its the free() of the line
marked above thats failing, because it is trying to free something at
the address of VGLFont, which is a global array within libvgl.a.
Using gdb on the program should make it possible to confirm that or not.
As for how to get around it, I would say that this is a bug in libvgl.
> Also what sort of file is it after? I guessed one of the fonts in
> /usr/share/syscons/fonts/ after uudecoding...
>
I think it might be. It reads the first 2 characters as width and
height, then the rest seems to be raw font data, which is read into
memory, not sure of the format other than that though.
Iain
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