Data commit

Task/Binary-strings/8086-Assembly/binary-strings-1.8086

@@ -0,0 +1,12 @@
+;this code assumes that both DS and ES point to the correct segments.
+cld
+mov si,offset TestMessage
+mov di,offset EmptyRam
+mov cx,5  ;length of the source string, you'll need to either know this
+          ;ahead of time or calculate it.
+rep movsb
+ret
+
+;there is no buffer overflow protection built into these functions so be careful!
+TestMessage byte "Hello"
+EmptyRam byte 0,0,0,0,0

Task/Binary-strings/8086-Assembly/binary-strings-2.8086

@@ -0,0 +1,11 @@
+;this code assumes that ES points to the correct segment.
+cld
+mov di,offset TestMessage
+mov al,'o'   ;the byte we wish to check
+mov cx,5     ;len(Test)
+
+repnz scasb  ;scan through the string and stop if a match is found.
+             ;flags will be set accordingly
+ret
+
+TestMessage byte "Hello"

Task/Binary-strings/8086-Assembly/binary-strings-3.8086

@@ -0,0 +1,14 @@
+;this code assumes that both DS and ES point to the correct segments.
+cld
+mov si,offset foo
+mov di,offset bar
+mov cx,4 ;length of the shorter of the two.
+
+repz cmpsb
+; this will continue until the strings are different or CX = 0,
+; whichever occurs first. If, after this, the zero flag is set and CX=0,
+; the strings were the same
+ret
+
+foo byte "test"
+bar byte "test"