Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/modbus/configuration.go

@@ -0,0 +1,64 @@
+package modbus
+
+import "fmt"
+
+const (
+	maxQuantityDiscreteInput    = uint16(2000)
+	maxQuantityCoils            = uint16(2000)
+	maxQuantityInputRegisters   = uint16(125)
+	maxQuantityHoldingRegisters = uint16(125)
+)
+
+type configuration interface {
+	check() error
+	process() (map[byte]requestSet, error)
+	sampleConfigPart() string
+}
+
+func removeDuplicates(elements []uint16) []uint16 {
+	encountered := make(map[uint16]bool, len(elements))
+	result := make([]uint16, 0, len(elements))
+
+	for _, addr := range elements {
+		if !encountered[addr] {
+			encountered[addr] = true
+			result = append(result, addr)
+		}
+	}
+
+	return result
+}
+
+func normalizeInputDatatype(dataType string) (string, error) {
+	switch dataType {
+	case "BIT", "INT8L", "INT8H", "UINT8L", "UINT8H",
+		"INT16", "UINT16", "INT32", "UINT32", "INT64", "UINT64",
+		"FLOAT16", "FLOAT32", "FLOAT64", "STRING":
+		return dataType, nil
+	}
+	return "unknown", fmt.Errorf("unknown input type %q", dataType)
+}
+
+func normalizeOutputDatatype(dataType string) (string, error) {
+	switch dataType {
+	case "", "native":
+		return "native", nil
+	case "INT64", "UINT64", "FLOAT64", "STRING":
+		return dataType, nil
+	}
+	return "unknown", fmt.Errorf("unknown output type %q", dataType)
+}
+
+func normalizeByteOrder(byteOrder string) (string, error) {
+	switch byteOrder {
+	case "ABCD", "MSW-BE", "MSW": // Big endian (Motorola)
+		return "ABCD", nil
+	case "BADC", "MSW-LE": // Big endian with bytes swapped
+		return "BADC", nil
+	case "CDAB", "LSW-BE": // Little endian with bytes swapped
+		return "CDAB", nil
+	case "DCBA", "LSW-LE", "LSW": // Little endian (Intel)
+		return "DCBA", nil
+	}
+	return "unknown", fmt.Errorf("unknown byte-order %q", byteOrder)
+}