make units more dynamic

Signed-off-by: Christian Hesse <mail@eworm.de>

MemoryMeter.c

@@ -25,8 +25,16 @@ int MemoryMeter_attributes[] = {
 };
 
 static void MemoryMeter_setValues(Meter* this, char* buffer, int size) {
+   int written;
    Platform_setMemoryValues(this);
-   snprintf(buffer, size, "%ld/%ldM", (long int) this->values[0] / 1024, (long int) this->total / 1024);
+
+   written = Meter_humanUnit(buffer, this->values[0], size);
+   buffer += written;
+   if ((size -= written) > 0) {
+      *buffer++ = '/';
+      size--;
+      Meter_humanUnit(buffer, this->total, size);
+   }
 }
 
 static void MemoryMeter_display(Object* cast, RichString* out) {

Meter.c

@@ -141,6 +141,34 @@ Meter* Meter_new(struct ProcessList_* pl, int param, MeterClass* type) {
    return this;
 }
 
+int Meter_humanUnit(char* buffer, unsigned long int value, int size) {
+	const char * prefix = "KMGTPEZY";
+	unsigned long int powi = 1;
+	unsigned int written, powj = 1, precision = 2;
+
+	for(;;) {
+		if (value / 1024 < powi)
+			break;
+
+		if (prefix[1] == 0)
+			break;
+
+		powi *= 1024;
+		++prefix;
+	}
+
+	for (; precision > 0; precision--) {
+		powj *= 10;
+		if (value / powi < powj)
+			break;
+	}
+
+	written = snprintf(buffer, size, "%.*f%c",
+		precision, (double) value / powi, *prefix);
+
+	return written;
+}
+
 void Meter_delete(Object* cast) {
    if (!cast)
       return;

Meter.h

@@ -105,6 +105,8 @@ extern MeterClass Meter_class;
 
 Meter* Meter_new(struct ProcessList_* pl, int param, MeterClass* type);
 
+int Meter_humanUnit(char* buffer, unsigned long int value, int size);
+
 void Meter_delete(Object* cast);
 
 void Meter_setCaption(Meter* this, const char* caption);

SwapMeter.c

@@ -33,9 +33,17 @@ static void SwapMeter_humanNumber(char* buffer, const long int* value) {
    sprintf(buffer, "%ldM ", *value / MEGABYTE);
 }
 
-static void SwapMeter_setValues(Meter* this, char* buffer, int len) {
+static void SwapMeter_setValues(Meter* this, char* buffer, int size) {
+   int written;
    Platform_setSwapValues(this);
-   snprintf(buffer, len, "%ld/%ldM", (long int) this->values[0] / MEGABYTE, (long int) this->total / MEGABYTE);
+
+   written = Meter_humanUnit(buffer, this->values[0], size);
+   buffer += written;
+   if ((size -= written) > 0) {
+      *buffer++ = '/';
+      size--;
+      Meter_humanUnit(buffer, this->total, size);
+   }
 }
 
 static void SwapMeter_display(Object* cast, RichString* out) {