Re: Fix for #3464

[Jakob Eriksson]

Can I create b: on the fly, allocate 1.44 megabyte RAM, do all copies 
there and then
copy it back?

Am I on crack?

regards,
Jakob

Eric Pouech wrote:
> It turns out that DOS' ioctl 0x440F (set logical drive map) was 
> strangely implemented. From the doc I have, this ioctl is responsible 
> for setting the logical drive to access a physical drive. This is used 
> for example, on a single floppy PC when implementing the copy a:foo 
> b:bar command, where a: and b: refer to the same physical device (the 
> floppy), and this ioctl is called to toggle the access from a: or b: 
> to the physical device.
> This implies that this ioctl is not responsible for creating the 
> mapping of a: and b: to the same physical device.
> The current implementation was trying to achieve this goal and 
> moreover it was done in the wrong way :-/
> The attached patch removes altogether the support for logical drive 
> map in int21h (and fixed Myst BTW).
>
> A+
>
> Name:          int21_mapdrv
> ChangeLog:     ioctl 440F only returns non mapped drives (for now)
> License:       X11
> GenDate:       2005/10/12 18:41:20 UTC
> ModifiedFiles: dlls/winedos/int21.c
> AddedFiles:    
> RemovedFiles:  
> ===================================================================
> RCS file: /home/cvs/cvsroot/wine/wine/dlls/winedos/int21.c,v
> retrieving revision 1.81
> diff -u -u -r1.81 int21.c
> --- dlls/winedos/int21.c	18 Sep 2005 11:11:36 -0000	1.81
> +++ dlls/winedos/int21.c	12 Oct 2005 18:40:47 -0000
> @@ -2627,19 +2627,12 @@
>         break;
> case 0x0f: /* SET LOGICAL DRIVE MAP */
> -
>    {
> -
>        WCHAR dev[3], tgt[4];
> -
>    TRACE("IOCTL - SET LOGICAL DRIVE MAP for drive %s\n",
> -
>          INT21_DriveName( BL_reg(context)));
>
> -
>        TRACE("IOCTL - SET LOGICAL DRIVE MAP for drive %s\n",
> -
>   INT21_DriveName( BL_reg(context)));
> -
>        dev[0] = 'A' + drive; dev[1] = ':'; dev[2] = 0;
> -
>        tgt[0] = 'A' + drive + 1; tgt[1] = ':'; tgt[2] = '\\'; tgt[3] = 0;
> -
>        if (!DefineDosDeviceW(DDD_RAW_TARGET_PATH, dev, tgt))
> -
>    {
> -
> SET_CFLAG(context);
> -
> SET_AX( context, 0x000F );  /* invalid drive */
> -
>    }
> -
>    }
> -
>    /* FIXME: as of today, we don't support logical drive mapping...
> -
>     */
> -
>    SET_AL( context, 0 );
>   break;
>
> case 0x11: /* QUERY GENERIC IOCTL CAPABILITY */