add exit description array

exit/exit.go

@@ -28,3 +28,33 @@ const (
 
 	EX_ABORT ExitT = 134
 )
+
+var exitDescs = [^ExitT(0)]string{}
+
+func init() {
+	exitDescs[EX_OK] = "successful termination"
+	exitDescs[EX_USAGE] = "command line usage error"
+	exitDescs[EX_DATAERR] = "data format error"
+	exitDescs[EX_NOINPUT] = "cannot open input"
+	exitDescs[EX_NOUSER] = "addressee unknown"
+	exitDescs[EX_NOHOST] = "host name unknown"
+	exitDescs[EX_UNAVAILABLE] = "service unavailable"
+	exitDescs[EX_SOFTWARE] = "internal software error"
+	exitDescs[EX_OSERR] = "system error" // e.g. can't fork
+	exitDescs[EX_OSFILE] = "critical OS file missing"
+	exitDescs[EX_CANTCREAT] = "can't create (user) output file"
+	exitDescs[EX_IOERR] = "input/output error"
+	exitDescs[EX_TEMPFAIL] = "temp failure; user is invited to retry"
+	exitDescs[EX_PROTOCOL] = "remote error in protocol"
+	exitDescs[EX_NOPERM] = "permission denied"
+	exitDescs[EX_CONFIG] = "configuration error"
+	exitDescs[EX_ABORT] = "process aborted"
+}
+
+func (e ExitT) Desc() string {
+	return exitDescs[e]
+}
+
+func GetAllExitCodeDescriptions() [^ExitT(0)]string {
+	return exitDescs
+}