examples/lib/lengthw.xyw
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; returns the length of a string (max: 255)
; a16 -[xwyw]- b16
.label lengthw
POPxw ; store start address
$0000 POPyw ; counter
.label lengthw.loop
; if at end of string, go to end
LDBxw $00 EQU lengthw.end JCNw
; otherwise increment address and counter
INCxyw
lengthw.loop JMPw
.label lengthw.end
PSHyw RTS
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