Data commit

Task/Empty-string/X86-64-Assembly/empty-string.x86-64

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+option casemap:none
+
+printf    proto :qword, :VARARG
+exit      proto :dword
+
+.data
+e_str   db 1 dup (0)
+
+.code
+main proc
+  xor rcx, rcx
+  lea rax, e_str
+  cmp byte ptr [rax+rcx],0          ;; Is e_str[0] equal to 0?
+  je _isempty                       ;; Yes so goto isEmpty
+  jne _notempty                     ;; No, got notEmpty
+  jmp _exit                         ;; Neither condition is met, so exit.
+
+  _isempty:
+    invoke printf, CSTR("e_str is empty",10)
+    lea rax, e_str
+    mov byte ptr [rax+0], 's'       ;; Copy a char into e_str[0]
+    jmp main                        ;; Test again..
+
+  _notempty:
+    invoke printf, CSTR("e_str is NOT empty",10)
+    ;; Fall though to exit here..
+ _exit:
+    xor rsi, rsi
+    call exit
+    ret
+main endp
+end