String length: Difference between revisions

=={{header|6502 Assembly}}==

{{trans|Z80 Assembly}}

Most 6502-based computers predate Unicode, so only byte length will be demonstrated for now.

<lang 6502asm>GetStringLength: ;$00 and $01 make up the pointer to the string's base address.

;(Of course, any two consecutive zero-page memory locations can fulfill this role.)

LDY #0 ;Y doubles as the pointer to the chars in the string and our length counter

loop_getStringLength:

LDA ($00),y

BEQ exit

INY

JMP loop_getStringLength

exit:

RTS ;string length is now loaded into Y.</lang>