htop/BatteryMeter.c

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/*
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htop - BatteryMeter.c
(C) 2004-2011 Hisham H. Muhammad
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
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This meter written by Ian P. Hands (iphands@gmail.com, ihands@redhat.com).
*/
#include "BatteryMeter.h"
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#include "ProcessList.h"
#include "CRT.h"
#include "String.h"
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#include <string.h>
#include <stdlib.h>
#include <dirent.h>
#include <unistd.h>
/*{
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#include "Meter.h"
typedef enum ACPresence_ {
AC_ABSENT,
AC_PRESENT,
AC_ERROR
} ACPresence;
}*/
int BatteryMeter_attributes[] = {
BATTERY
};
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static unsigned long int parseUevent(FILE * file, const 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;
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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 char batteryPath[] = PROCDIR "/acpi/battery/";
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DIR* batteryDir = opendir(batteryPath);
if (!batteryDir)
return 0;
typedef struct listLbl {
char *content;
struct listLbl *next;
} list;
list *myList = NULL;
list *newEntry;
/*
Some of this is based off of code found in kismet (they claim it came from gkrellm).
Written for multi battery use...
*/
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for (const struct dirent* dirEntries = readdir((DIR *) batteryDir); dirEntries; dirEntries = readdir((DIR *) batteryDir)) {
char* entryName = (char *) dirEntries->d_name;
if (strncmp(entryName, "BAT", 3))
continue;
newEntry = calloc(1, sizeof(list));
newEntry->next = myList;
newEntry->content = entryName;
myList = newEntry;
}
unsigned long int total = 0;
for (newEntry = myList; newEntry; newEntry = newEntry->next) {
const char infoPath[30];
const FILE *file;
char line[50];
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snprintf((char *) infoPath, sizeof infoPath, "%s%s/%s", batteryPath, newEntry->content, fileName);
if ((file = fopen(infoPath, "r")) == NULL) {
closedir(batteryDir);
return 0;
}
for (unsigned short int i = 0; i < lineNum; i++) {
fgets(line, sizeof line, (FILE *) file);
}
fclose((FILE *) file);
const char *foundNumTmp = String_getToken(line, wordNum);
const unsigned long int foundNum = atoi(foundNumTmp);
free((char *) foundNumTmp);
total += foundNum;
}
free(myList);
free(newEntry);
closedir(batteryDir);
return total;
}
static ACPresence chkIsOnline() {
FILE *file = NULL;
ACPresence isOn = AC_ERROR;
if (access(PROCDIR "/acpi/ac_adapter", F_OK) == 0) {
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const char *power_supplyPath = PROCDIR "/acpi/ac_adapter";
DIR *power_supplyDir = opendir(power_supplyPath);
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if (!power_supplyDir)
return AC_ERROR;
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for (const struct dirent *dirEntries = readdir((DIR *) power_supplyDir); dirEntries; dirEntries = readdir((DIR *) power_supplyDir)) {
char* entryName = (char *) dirEntries->d_name;
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if (entryName[0] != 'A')
continue;
char statePath[50];
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snprintf((char *) statePath, sizeof statePath, "%s/%s/state", power_supplyPath, entryName);
file = fopen(statePath, "r");
if (!file) {
isOn = AC_ERROR;
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 {
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const 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];
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snprintf((char *) onlinePath, sizeof 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);
return isOn;
}
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;
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const char *power_supplyPath = "/sys/class/power_supply/";
DIR *power_supplyDir = opendir(power_supplyPath);
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if (!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];
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snprintf((char *) ueventPath, sizeof ueventPath, "%s%s/uevent", power_supplyPath, entryName);
FILE *file;
if ((file = fopen(ueventPath, "r")) == NULL) {
closedir(power_supplyDir);
return 0;
}
if ((totalFull += parseUevent(file, "POWER_SUPPLY_ENERGY_FULL="))) {
totalRemain += parseUevent(file, "POWER_SUPPLY_ENERGY_NOW=");
} else {
//reset file pointer
if (fseek(file, 0, SEEK_SET) < 0) {
closedir(power_supplyDir);
fclose(file);
return 0;
}
}
//Some systems have it as CHARGE instead of ENERGY.
if ((totalFull += parseUevent(file, "POWER_SUPPLY_CHARGE_FULL="))) {
totalRemain += parseUevent(file, "POWER_SUPPLY_CHARGE_NOW=");
} else {
//reset file pointer
if (fseek(file, 0, SEEK_SET) < 0) {
closedir(power_supplyDir);
fclose(file);
return 0;
}
}
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;
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const char *onAcText, *onBatteryText, *unknownText;
unknownText = "%.1f%%";
if (this->mode == TEXT_METERMODE) {
onAcText = "%.1f%% (Running on A/C)";
onBatteryText = "%.1f%% (Running on battery)";
} else {
onAcText = "%.1f%%(A/C)";
onBatteryText = "%.1f%%(bat)";
}
ACPresence isOnLine = chkIsOnline();
if (isOnLine == AC_PRESENT) {
snprintf(buffer, len, onAcText, percent);
} else if (isOnLine == AC_ABSENT) {
snprintf(buffer, len, onBatteryText, percent);
} else {
snprintf(buffer, len, unknownText, percent);
}
return;
}
MeterType BatteryMeter = {
.setValues = BatteryMeter_setValues,
.display = NULL,
.mode = TEXT_METERMODE,
.items = 1,
.total = 100.0,
.attributes = BatteryMeter_attributes,
.name = "Battery",
.uiName = "Battery",
.caption = "Battery: "
};