db dup ... using inline asm?

[edward kaeufer]

I wish allocate some space in code segment, something like this...

buffer: db 255 dup (0)

using power basic for dos inline asm. Can I?

Ed


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[Clay Clear]

Nope. The PB inline ASM commands do not use the same syntax
as assemblers such as MASM, etc. You could go about it in
several ways:

S$ = SPACE$(255). Then populate the string with the desired data,
and reference the string's bytes with an index pointer.

DIM S AS ASCIIZ*255. Use as above.

MyTable:
! db 00
! db 00
etc., up to the 255 bytes

Then use ! lea dx, MyTable, and reference CS:[DX], using DX (or whichever
index register you specified) as the index.

TYPE MyType
a(1 TO 255) AS BYTE
END TYPE

DIM w AS MyType.

Then do:

! lea di, w
! push ds
! pop es

Then reference it in es:[di]

P.S. I am not sure if you can use the DX register as the index register
in the CS:[DX] - it's been quite a while since I used labeled tables
in my PB/DOS.

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[This message has been edited by Clay Clear (edited May 14, 2003).]

[Tom Hanlin]

AX, CX, and DX can't be used for addressing. BX, SI, or DI are good bets.

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Tom Hanlin
PowerBASIC Staff

[Clay Clear]

Thanks, Tom, for the clarification. I already knew that, but I
guess my sleep-deprived mind blew it off. <chuckle>


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