Initial data commit

Task/String-length/8086-Assembly/string-length.8086

@@ -0,0 +1,15 @@
+;INPUT: DS:SI = BASE ADDR. OF STRING
+;TYPICALLY, MS-DOS USES $ TO TERMINATE STRINGS.
+GetStringLength:
+xor cx,cx      ;this takes fewer bytes to encode than "mov cx,0"
+cld            ;makes string functions post-inc rather than post-dec.
+
+loop_GetStringLength:
+lodsb          ;equivalent of "mov al,[ds:si],inc si" except this doesn't alter the flags.
+cmp '$'
+je done        ;if equal, we're finished.
+inc cx         ;add 1 to length counter. A null string will have a length of zero.
+jmp loop_GetStringLength
+
+done:
+ret