Add readhexfile function

Author: mshahzeb

blockdevice/stats.go

@@ -494,7 +494,7 @@ func (fs FS) SysBlockDeviceIOStat(device string) (IODeviceStats, error) {
 			"ioerr_cnt":  &ioDeviceStats.IOErrCount,
 	} {
 			var val uint64
-			val, err = util.ReadUintFromFile(fs.sys.Path(sysBlockPath, device, sysDevicePath, file))
+			val, err = util.ReadHexFromFile(fs.sys.Path(sysBlockPath, device, sysDevicePath, file))
 			if err != nil {
 					return IODeviceStats{}, err
 			}

internal/util/parse.go

@@ -110,3 +110,12 @@ func ParseBool(b string) *bool {
 	}
 	return &truth
 }
+
+// ReadHexFromFile reads a file and attempts to parse a uint64 from a hexadecimal format 0xXX.
+func ReadHexFromFile(path string) (uint64, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+			return 0, err
+	}
+	return strconv.ParseUint(strings.TrimSpace(string(data[2:])), 16, 64)
+}