updated battery meter code from Ian Hands, slightly tweaked

BatteryMeter.c

@@ -4,7 +4,7 @@
   Released under the GNU GPL, see the COPYING file
   in the source distribution for its full text.
 
-  This "Meter" written by Ian P. Hands (iphands@gmail.com).
+  This "Meter" written by Ian P. Hands (iphands@gmail.com, ihands@redhat.com).
 */
 
 #include "BatteryMeter.h"
@@ -14,13 +14,39 @@
 #include "String.h"
 #include "debug.h"
 
+/*{
+
+typedef enum ACPresence_ {
+   AC_ABSENT,
+   AC_PRESENT,
+   AC_ERROR
+} ACPresence;
+
+}*/
+
 int BatteryMeter_attributes[] = {
    BATTERY
 };
 
+static unsigned long int parseUevent(FILE * file, char *key) {
+   char line[100];
+   unsigned long int dValue = 0;
+
+   while (fgets(line, sizeof line, file)) {
+      if (strncmp(line, key, strlen(key)) == 0) {
+         char *value;
+         value = strtok(line, "=");
+         value = strtok(NULL, "=");
+         dValue = atoi(value);
+         break;
+      }
+   }
+   return dValue;
+}
+
 static unsigned long int parseBatInfo(const char *fileName, const unsigned short int lineNum, const unsigned short int wordNum) {
    const DIR *batteryDir;
-   const struct dirent *pDirEnt;
+   const struct dirent *dirEntries;
 
    const char batteryPath[] = PROCDIR "/acpi/battery/";
    batteryDir = opendir(batteryPath);
@@ -29,8 +55,11 @@ static unsigned long int parseBatInfo(const char * fileName, const unsigned shor
       return 0;
    }
 
-   char * string;
+   char *entryName;
-   typedef struct listLbl { char* content; struct listLbl* next; } list;
+   typedef struct listLbl {
+      char *content;
+      struct listLbl *next;
+   } list;
 
    list *myList = NULL;
    list *newEntry;
@@ -39,14 +68,15 @@ static unsigned long int parseBatInfo(const char * fileName, const unsigned shor
       Some of this is based off of code found in kismet (they claim it came from gkrellm).
       Written for multi battery use...
     */
-   for (pDirEnt= readdir((DIR*)batteryDir); pDirEnt; pDirEnt = readdir((DIR*)batteryDir)) {
+   for (dirEntries = readdir((DIR *) batteryDir); dirEntries; dirEntries = readdir((DIR *) batteryDir)) {
-      string = (char*)pDirEnt->d_name;
+      entryName = (char *) dirEntries->d_name;
-      if(!strcmp(string, ".") || !strcmp(string, ".."))
+
+      if (strncmp(entryName, "BAT", 3))
          continue;
 
       newEntry = calloc(1, sizeof(list));
       newEntry->next = myList;
-      newEntry->content = string;
+      newEntry->content = entryName;
       myList = newEntry;
    }
 
@@ -81,35 +111,192 @@ static unsigned long int parseBatInfo(const char * fileName, const unsigned shor
    return total;
 }
 
-static void BatteryMeter_setValues(Meter* this, char* buffer, int len) {
+static ACPresence chkIsOnline() {
-   FILE* file = fopen(PROCDIR "/acpi/ac_adapter/AC/state", "r");
+   FILE *file = NULL;
-   if (!file)
+   ACPresence isOn = AC_ERROR;
-      file = fopen(PROCDIR "/acpi/ac_adapter/ADP1/state", "r");
+
+   if (access(PROCDIR "/acpi/ac_adapter", F_OK) == 0) {
+      const struct dirent *dirEntries;
+      char *power_supplyPath = PROCDIR "/acpi/ac_adapter";
+      DIR *power_supplyDir = opendir(power_supplyPath);
+      char *entryName;
+
+      if (!power_supplyDir) {
+         closedir(power_supplyDir);
+         return AC_ERROR;
+      }
+
+      for (dirEntries = readdir((DIR *) power_supplyDir); dirEntries; dirEntries = readdir((DIR *) power_supplyDir)) {
+         entryName = (char *) dirEntries->d_name;
+
+         if (strncmp(entryName, "A", 1)) {
+            continue;
+         }
+
+
+         char statePath[50];
+         sprintf((char *) statePath, "%s/%s/state", power_supplyPath, entryName);
+         file = fopen(statePath, "r");
+
          if (!file) {
-      snprintf(buffer, len, "n/a");
+            isOn = AC_ERROR;
-      return;
+            continue;
          }
 
          char line[100];
          fgets(line, sizeof line, file);
          line[sizeof(line) - 1] = '\0';
+
+         if (file) {
+            fclose(file);
+            file = NULL;
+         }
+
+         const char *isOnline = String_getToken(line, 2);
+
+         if (strcmp(isOnline, "on-line") == 0) {
+            free((char *) isOnline);
+            isOn = AC_PRESENT;
+            // If any AC adapter is being used then stop
+            break;
+
+         } else {
+            isOn = AC_ABSENT;
+         }
+         free((char *) isOnline);
+      }
+
+      if (power_supplyDir)
+         closedir(power_supplyDir);
+
+   } else {
+
+      char *power_supplyPath = "/sys/class/power_supply";
+
+      if (access("/sys/class/power_supply", F_OK) == 0) {
+         const struct dirent *dirEntries;
+         DIR *power_supplyDir = opendir(power_supplyPath);
+         char *entryName;
+
+         if (!power_supplyDir) {
+            return AC_ERROR;
+         }
+
+         for (dirEntries = readdir((DIR *) power_supplyDir); dirEntries; dirEntries = readdir((DIR *) power_supplyDir)) {
+            entryName = (char *) dirEntries->d_name;
+
+            if (strncmp(entryName, "A", 1)) {
+               continue;
+            }
+
+            char onlinePath[50];
+            sprintf((char *) onlinePath, "%s/%s/online", power_supplyPath, entryName);
+            file = fopen(onlinePath, "r");
+
+            if (!file) {
+               isOn = AC_ERROR;
+               continue;
+            }
+
+            isOn = (fgetc(file) - '0');
+
+            if (file) {
+               fclose(file);
+               file = NULL;
+            }
+
+            if (isOn == AC_PRESENT) {
+               // If any AC adapter is being used then stop
+               break;
+            } else {
+               continue;
+            }
+         }
+
+         if (power_supplyDir)
+            closedir(power_supplyDir);
+      }
+   }
+
+   // Just in case :-)
+   if (file)
       fclose(file);
 
-   const unsigned long int totalFull = parseBatInfo("info", 3, 4);
+   return isOn;
-   const unsigned long int totalRemain = parseBatInfo("state", 5, 3);
+}
-   const double percent = totalFull > 0 ? ((double)totalRemain * 100) / (double)totalFull : 0;
 
-   if (totalFull == 0) {
+static double getProcBatData() {
+   const unsigned long int totalFull = parseBatInfo("info", 3, 4);
+   if (totalFull == 0)
+      return 0;
+
+   const unsigned long int totalRemain = parseBatInfo("state", 5, 3);
+   if (totalRemain == 0)
+      return 0;
+
+   double percent = totalFull > 0 ? ((double) totalRemain * 100) / (double) totalFull : 0;
+
+   return percent;
+}
+
+static double getSysBatData() {
+   const struct dirent *dirEntries;
+   char *power_supplyPath = "/sys/class/power_supply/";
+   DIR *power_supplyDir = opendir(power_supplyPath);
+
+
+   if (!power_supplyDir) {
+      closedir(power_supplyDir);
+      return 0;
+   }
+
+   char *entryName;
+
+   unsigned long int totalFull = 0;
+   unsigned long int totalRemain = 0;
+
+   for (dirEntries = readdir((DIR *) power_supplyDir); dirEntries; dirEntries = readdir((DIR *) power_supplyDir)) {
+      entryName = (char *) dirEntries->d_name;
+
+      if (strncmp(entryName, "BAT", 3)) {
+         continue;
+      }
+
+      const char ueventPath[50];
+
+      sprintf((char *) ueventPath, "%s%s/uevent", power_supplyPath, entryName);
+
+      FILE *file;
+      if ((file = fopen(ueventPath, "r")) == NULL) {
+         closedir(power_supplyDir);
+         return 0;
+      }
+
+      totalFull += parseUevent(file, "POWER_SUPPLY_ENERGY_FULL=");
+      totalRemain += parseUevent(file, "POWER_SUPPLY_ENERGY_NOW=");
+      fclose(file);
+   }
+
+   const double percent = totalFull > 0 ? ((double) totalRemain * 100) / (double) totalFull : 0;
+   closedir(power_supplyDir);
+   return percent;
+}
+
+static void BatteryMeter_setValues(Meter * this, char *buffer, int len) {
+   double percent = getProcBatData();
+   if (percent == 0) {
+      percent = getSysBatData();
+      if (percent == 0) {
          snprintf(buffer, len, "n/a");
          return;
       }
+   }
 
    this->values[0] = percent;
 
-   const char* isOnline = String_getToken(line, 2);
+   char *onAcText, *onBatteryText, *unknownText;
-   
-   char *onAcText, *onBatteryText;
 
+   unknownText = "%.1f%%";
    if (this->mode == TEXT_METERMODE) {
       onAcText = "%.1f%% (Running on A/C)";
       onBatteryText = "%.1f%% (Running on battery)";
@@ -118,13 +305,16 @@ static void BatteryMeter_setValues(Meter* this, char* buffer, int len) {
       onBatteryText = "%.1f%%(bat)";
    }
 
-   if (strcmp(String_getToken(line, 2),"on-line") == 0) {
+   ACPresence isOnLine = chkIsOnline();
+
+   if (isOnLine == AC_PRESENT) {
       snprintf(buffer, len, onAcText, percent);
-   } else {
+   } else if (isOnLine == AC_ABSENT) {
       snprintf(buffer, len, onBatteryText, percent);
+   } else {
+      snprintf(buffer, len, unknownText, percent);
    }
 
-   free((char*)isOnline);
    return;
 }