+; prompt for user
+; no args - reads from globals
+repl:
+
+ %define CMDSTR 4 ; the previous line read from user
+
+ push ebp
+ mov ebp, esp
+
+ sub esp, 4
+
+ _repl_loop:
+
+ ; print the prompt
+ push prompt_str
+ call printf
+ push DWORD [stdout]
+ call fflush
+
+ ; read line from stdin
+ push 0
+ call readLine
+
+ mov DWORD [ebp-CMDSTR], eax
+
+ ; commands are single char for now
+ cmp ecx, 1
+ jne _repl_invalid
+
+ ; parse commands
+ mov eax, DWORD [ebp-CMDSTR]
+ mov eax, [eax]
+
+ ; q exists program
+ mov eax, DWORD [ebp-CMDSTR]
+ cmp BYTE [eax], 'q'
+ jne _repl_cmd_quit_end
+ jmp _repl_exit
+ _repl_cmd_quit_end:
+
+
+ _repl_invalid:
+ push invalidcommand_str
+ call printf
+
+ _repl_continue:
+ jmp _repl_loop
+
+ _repl_exit:
+
+ %undef CMDSTR
+
+ mov esp, ebp
+ pop ebp
+ ret
+