client: Basic detection of how much capacity a host's battery has on Android and Windows.

client/hostinfo_unix.cpp

@@ -444,6 +444,37 @@ bool HOST_INFO::host_is_running_on_batteries() {
 #endif
 }
 
+// Returns the percent of which the battery is charged
+//
+int HOST_INFO::host_battery_charge() {
+#if defined(ANDROID)
+    // using /sys/class/power_supply/battery/capacity
+    char capacitypath[256];
+    int capacity = 0;
+
+    snprintf(capacitypath, sizeof(capacitypath), "/sys/class/power_supply/battery/capacity");
+
+    FILE *battery_capacity_file = fopen(acpath, "r");
+    if(battery_capacity_file) {
+        fscanf(battery_capacity_file, "%d", &capacity);
+        fclose(battery_capacity_file);
+    }
+
+    if (capacity) {
+        char msg[1024];
+        snprintf(msg, sizeof(msg),
+            "battery capacity at: %d%% charge",
+            capacity
+        );
+        LOGD(msg);
+        return capacity;
+    }
+#endif
+    return 0;
+}
+
+
+
 #if LINUX_LIKE_SYSTEM
 static void parse_meminfo_linux(HOST_INFO& host) {
     char buf[256];

client/hostinfo_win.cpp

@@ -1279,9 +1279,9 @@ int HOST_INFO::get_host_info() {
 }
 
 bool HOST_INFO::host_is_running_on_batteries() {
-    SYSTEM_POWER_STATUS pStatus;
-    ZeroMemory(&pStatus, sizeof(SYSTEM_POWER_STATUS));
-    if (!GetSystemPowerStatus(&pStatus)) {
+    SYSTEM_POWER_STATUS Status;
+    ZeroMemory(&Status, sizeof(SYSTEM_POWER_STATUS));
+    if (!GetSystemPowerStatus(&Status)) {
         return false;
     }
 
@@ -1289,13 +1289,24 @@ bool HOST_INFO::host_is_running_on_batteries() {
     //   undocumented value, so lets check to see if the
     //   battery is charging or missing and make that part
     //   of the decision.
-    bool bIsOnBatteryPower  = (pStatus.ACLineStatus != 1);
-    bool bIsBatteryCharging = ((pStatus.BatteryFlag & 8) == 8);
-    bool bIsBatteryMissing = ((pStatus.BatteryFlag & 128) == 128);
+    bool bIsOnBatteryPower  = (Status.ACLineStatus != 1);
+    bool bIsBatteryCharging = ((Status.BatteryFlag & 8) == 8);
+    bool bIsBatteryMissing = ((Status.BatteryFlag & 128) == 128);
 
     return (bIsOnBatteryPower && !bIsBatteryCharging && !bIsBatteryMissing);
 }
 
+int HOST_INFO::host_battery_charge() {
+    SYSTEM_POWER_STATUS Status;
+    ZeroMemory(&Status, sizeof(SYSTEM_POWER_STATUS));
+    if (!GetSystemPowerStatus(&Status)) {
+        return false;
+    }
+
+    if (((int)Status.BatteryLifePercent) == 255) return 0;
+    return ((int)Status.BatteryLifePercent);
+}
+
 bool HOST_INFO::users_idle(bool /*check_all_logins*/, double idle_time_to_run) {
     double seconds_idle = get_idle_tick_count() / 1000;
     double seconds_time_to_run = 60 * idle_time_to_run;

lib/hostinfo.h

@@ -75,6 +75,7 @@ public:
     void print();
 
     bool host_is_running_on_batteries();
+    int host_battery_charge();
 #ifdef __APPLE__
     bool users_idle(bool check_all_logins, double idle_time_to_run, double *actual_idle_time=NULL);
 #else