replace atoi with my own impl to make sure that no errors occour

XD.1

@@ -13,6 +13,10 @@
 .Nm
 Displays information using a smiley face like so: :)
 to interpret it refer to the following tables:
+Displays information using a smiley face.
+to interpret XD's output refer to the following tables (or
+.Nm
+\fB-e\fR):
 .Ss Eyes
 .TS
 tab(;) allbox;
@@ -42,6 +46,13 @@ c;l.
  /;command not found
  (;previous signal is failure
 .TE
+.Ss Exit Status:
+.Nm
+returns the number that was passed in to allow the user to re-run the program
+and get the same results. If there's an internal error
+.Nm
+returns 1. If you wish to find out more infomation about the error enable ERR
+in the config.mk.
 .Sh OPTIONS
 .Ss -v
 Print version information to stdout and exit.