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Date:	Thu, 03 Mar 2011 18:32:43 +1000
From:	Jason Hood <jadoxa AT yahoo DOT com DOT au>
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Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: csdpmi7 not working on virtualbox, how use dosmemget with seg
	ofs from int21h?
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> the addresses of the structures in real mode memory in question are in
> segment offset format coming from and going into int21h function 7303h
> (a DOS FAT32 function) at es:di and I need a C string at ds:dx, and I
> need to get at whatever is coming back from es:di.

How about FAQ 18.2?  Here's some untested code.

#include <go32.h>
#include <dpmi.h>
#include <sys/farptr.h>

__dpmi_regs r;

_farpokew(_dos_ds, __tb+2, 0); // initialise the version
dosmemput(path, strlen(path)+1, __tb+sizeof(extFAT32FreeSpaceStructure));
r.x.ds = r.x.es = __tb >> 4;
r.x.dx = (__tb & 0x0f) + sizeof(extFAT32FreeSpaceStructure);
r.x.di = __tb & 0x0f;
__dpmi_int(0x21, &r);
dosmemget(__tb, sizeof(extFAT32FreeSpaceStructure), &extFAT32FreeSpace);

-- 
Jason.

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