htop/darwin/Battery.c

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#include "Battery.h"
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#include <math.h>
#include <CoreFoundation/CoreFoundation.h>
#include <CoreFoundation/CFString.h>
#include <IOKit/ps/IOPowerSources.h>
#include <IOKit/ps/IOPSKeys.h>
void Battery_getData(double* level, ACPresence* isOnAC) {
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CFTypeRef power_sources = IOPSCopyPowerSourcesInfo();
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*level = NAN;
*isOnAC = AC_ERROR;
if(NULL == power_sources) {
return;
}
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CFArrayRef list = IOPSCopyPowerSourcesList(power_sources);
CFDictionaryRef battery = NULL;
int len;
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if(NULL == list) {
CFRelease(power_sources);
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return;
}
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len = CFArrayGetCount(list);
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/* Get the battery */
for(int i = 0; i < len && battery == NULL; ++i) {
CFDictionaryRef candidate = IOPSGetPowerSourceDescription(power_sources,
CFArrayGetValueAtIndex(list, i)); /* GET rule */
CFStringRef type;
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if(NULL != candidate) {
type = (CFStringRef) CFDictionaryGetValue(candidate,
CFSTR(kIOPSTransportTypeKey)); /* GET rule */
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if(kCFCompareEqualTo == CFStringCompare(type, CFSTR(kIOPSInternalType), 0)) {
CFRetain(candidate);
battery = candidate;
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}
}
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}
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if(NULL != battery) {
/* Determine the AC state */
CFStringRef power_state = CFDictionaryGetValue(battery, CFSTR(kIOPSPowerSourceStateKey));
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*isOnAC = (kCFCompareEqualTo == CFStringCompare(power_state, CFSTR(kIOPSACPowerValue), 0))
? AC_PRESENT
: AC_ABSENT;
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/* Get the percentage remaining */
double current;
double max;
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CFNumberGetValue(CFDictionaryGetValue(battery, CFSTR(kIOPSCurrentCapacityKey)),
kCFNumberDoubleType, &current);
CFNumberGetValue(CFDictionaryGetValue(battery, CFSTR(kIOPSMaxCapacityKey)),
kCFNumberDoubleType, &max);
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*level = (current * 100.0) / max;
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CFRelease(battery);
}
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CFRelease(list);
CFRelease(power_sources);
}