; input: HL - pointer to the 0th char of a string.
; outputs length to B. HL will point to the last character in the string just before the terminator.
; length is one-indexed and does not include the terminator. A null string will return 0 in B.

; "Terminator" is a label for a constant that can be configured in the source code. My code uses 0.
; Sample Usage:
;      ld hl,MyString
;      call GetStringLength

GetStringLength:
		ld b,0
loop_getStringLength:
		ld a,(hl)      ;load the next char
		cp Terminator  ;is it the terminator?
		ret z          ;if so, exit.
		inc hl         ;next char
		inc b          ;increment the byte count
		jr loop_getStringLength