From:	MERC::"uunet!WKUVX1.BITNET!MacroMan" 17-NOV-1992 02:05:18.92
To:	macro32@WKUVX1.BITNET
CC:	mwk!gleason, fenster@taveng.enet.dec.com
Subj:	RE: Locking down a structure in C

>
>   Here's another Open VMS Alpha AXP internals C question...
>
>   I'm converting some MACRO to C, and am changing  $DEFINI type
> blocks of code to  structures...and some of these need locking down, eg.
>
<Deleted>
> range:  .long   zzzdat
>         .long   zzzdat + zzz$k_len
>
>         $lkwset_s       inadr = range
>
>
>   Now, I'm trying to use a structure...
>
>         static struct
>                 {
>                 int l_zeep
>                 int l_zap
>                 int l_zip
>                 } zzz ;
>
>   What would be the "best" way to "calculate" the address of the ends of
>   structures to place in a range array for calling sys$lkwset?
>

void *range[2] = {&zzz,&zzz+1};

/* The +1 in C address arithmetic is really +1*(sizeof object pointing to) */

This compiles and gives the correct answer under DEC C.

> Lee K. Gleason N5ZMR
> Control-G Consultants
> gleason@mwk.uucp
>

        Yaacov
-------------------------------------------------
Yaacov Fenster                  +(972)-3-9307239
y.fenster@ieee.org
fenster@taveng.enet.dec.com     DTN 882-3153
All the opinions voiced are mine alone and do not reflect anyone else's
opinion. (Including Dec).