Char is char, which you probably have set to signed (vs unsigned). That is
why line 218: sign extends what it believes is a signed byte to a signed
word.
On Thu, Apr 10, 2008 at 2:21 PM, Luc Le Blanc <[EMAIL PROTECTED]> wrote:
> I have a position union:
>
> typedef struct
> {
> UInt8 type;
> UInt8 datum;
>
> union
> {
> struct
> {
> Int16 altitude;
> UInt32 northing;
> UInt32 easting;
> Char zone;
> UInt8 gore;
>
> } grid;
>
> struct
> {
> Int16 altitude;
> UInt32 latitude;
> UInt32 longitude;
> Boolean south;
> Boolean east;
>
> } latLon;
>
> Int16 altitude;
>
> Int16 depth;
>
> struct
> {
> float x, y, z;
>
> } absolute;
>
> struct
> {
> Int16 altitude;
> UInt16 unused;
> float x, y;
>
> } spot;
> };
> } Position;
>
> I use the grid case. Both zone and gore contain 0xff (as seen in
> debugger).
>
> I have a symbol:
>
> #define Undefined 0xff
>
> yet, when I hit
>
> if ( position->grid.zone == Undefined )
> StrPrintF( string, "X %ld%sY %ld",
> ( position->grid.easting + 50 ) / 100, separator,
> ( position->grid.northing + 50 ) / 100 );
>
> the StrPrintF is skipped. Here's the assembler:
>
> 00000214: 102A 000C move.b 12(a2),d0
> 00000218: 4880 ext.w d0
> 0000021A: 0C40 00FF cmpi.w #255,d0
> 0000021E: 6632 bne.s *+52 ; 0x00000252
>
> Go figure.
>
>
> Luc Le Blanc
> --
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>
--
[Jeff Loucks, Gig Harbor, WA, USA]
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