Copy a string: Difference between revisions

=={{header|68000 Assembly}}==

Making a reference to an existing string is simple. Just load its memory location into an address register.

<lang 68000devpac>myString: DC.B "HELLO WORLD",0

EVEN

LEA myString,A3</lang>

Copying a string involves a little more work:

<lang 68000devpac>StringRam equ $100000

myString: DC.B "HELLO WORLD",0

EVEN

LEA myString,A3

LEA StringRam,A4

CopyString:

MOVE.B (A3)+,D0

MOVE.B D0,(A4)+ ;we could have skipped D0 but this makes it easier to check for the terminator.

BEQ Terminated

BRA CopyString

Terminated: ;the null terminator is already stored along with the string itself, so we are done.

rts</lang>