Message-Id: <199605090728.DAA00334@delorie.com>
Date:         Thu, 09 May 96 10:17:49 LIT
From: Martynas Kunigelis <martynas DOT kunigelis AT VM DOT KTU DOT LT>
Subject:      Re: more sizeof questions
To: John Fortin <fortin44 AT eelab DOT newpaltz DOT edu>,
        DJGPP mailing list <djgpp AT delorie DOT com>
In-Reply-To:  Your message of Wed, 8 May 1996 19:45:41 +0000

On Wed, 8 May 1996 19:45:41 +0000 you said:
>OK, I'm a bit confused..(nothing new i'm afraid)... The structure
>below was taken from the VESA 1.2 spec. sizeof(_VGAInfoBlock) should
>be 256.  DJGPP gives 260.  What's up with this.  A previous posting
>mentioned 4 byte boundaries, but 256 is divisable by 4.  Any Ideas??
>
>TIA
>John
>
>typedef unsigned char   BYTE;
>typedef unsigned short  WORD;
>typedef unsigned long  DWORD;
>
>typedef struct
>{
>    DWORD VESASignature;   4
>    WORD VESAVersion;    2
                          + 2 byte filler
>    DWORD     OEMStringPointer;  4
>    DWORD     Capabilities;    4
>    DWORD     VideoModePointer;  4
>    WORD    TotalMemory;   2
                            + 2 byte filler
>    BYTE     Info[236];     236
>} _VGAInfoBlock;                             =      256 bytes
>
>
>John E. Fortin
>fortin44 AT eelab DOT newpaltz DOT edu

EVERY field must be 4-byte aligned. See my previous posting for a workaround.

Martynas