Data commit

Task/String-length/Z80-Assembly/string-length.z80

@@ -0,0 +1,18 @@
+; 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