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fix: handle uint64 overflow in battery power metrics

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- Fix display of invalid large values like 18446744073709544W
- macOS ioreg returns negative values as uint64 (two's complement)
- Detect overflow pattern (value > 2^63) and convert to signed
- Validate reasonable power range (-200W to 200W) for battery
- Add range validation for SystemPower (0 to 1000W)

Root cause: During charging, battery power is negative but ioreg
formats it as unsigned uint64, causing overflow. This fix properly
converts these values back to signed integers.
This commit is contained in:
Tw93
2026-01-14 11:26:37 +08:00
parent 0a632c0a22
commit 9b3220bfe4
1 changed files with 16 additions and 6 deletions
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22
cmd/status/metrics_battery.go
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@@ -227,20 +227,30 @@ func collectThermal() ThermalStatus {
valStr, _, _ = strings.Cut(valStr, ",")
valStr, _, _ = strings.Cut(valStr, "}")
valStr = strings.TrimSpace(valStr)
if powerMW, err := strconv.ParseFloat(valStr, 64); err == nil && powerMW > 0 {
thermal.SystemPower = powerMW / 1000.0
if powerMW, err := strconv.ParseFloat(valStr, 64); err == nil {
// SystemPower should always be positive, reject invalid values
if powerMW >= 0 && powerMW < 1000000 { // 0 to 1000W
thermal.SystemPower = powerMW / 1000.0
}
}
}
// Battery power (mW -> W, positive = discharging).
// Battery power (mW -> W, positive = discharging, negative = charging).
if _, after, found := strings.Cut(line, "\"BatteryPower\"="); found {
valStr := strings.TrimSpace(after)
valStr, _, _ = strings.Cut(valStr, ",")
valStr, _, _ = strings.Cut(valStr, "}")
valStr = strings.TrimSpace(valStr)
// Parse as int64 first to handle negative values (charging)
if powerMW, err := strconv.ParseInt(valStr, 10, 64); err == nil {
thermal.BatteryPower = float64(powerMW) / 1000.0
if powerMW, err := strconv.ParseFloat(valStr, 64); err == nil {
// macOS ioreg may return negative values as uint64 (two's complement overflow)
// If value > 2^63, convert from uint64 representation to proper signed value
if powerMW > float64(1<<63) {
powerMW = powerMW - 18446744073709551616.0 // 2^64
}
// Validate reasonable battery power range: -200W to 200W
if powerMW > -200000 && powerMW < 200000 {
thermal.BatteryPower = powerMW / 1000.0
}
}
}
}