Use size_t as len type for Meter_UpdateValues

Most of the time the parameter is passed to snprintf type functions

BatteryMeter.c

@@ -21,7 +21,7 @@ static const int BatteryMeter_attributes[] = {
    BATTERY
 };
 
-static void BatteryMeter_updateValues(Meter* this, char* buffer, int len) {
+static void BatteryMeter_updateValues(Meter* this, char* buffer, size_t len) {
    ACPresence isOnAC;
    double percent;
 

CPUMeter.c

@@ -50,7 +50,7 @@ static void CPUMeter_init(Meter* this) {
       Meter_setCaption(this, "Avg");
 }
 
-static void CPUMeter_updateValues(Meter* this, char* buffer, int size) {
+static void CPUMeter_updateValues(Meter* this, char* buffer, size_t size) {
    int cpu = this->param;
    if (cpu > this->pl->cpuCount) {
       xSnprintf(buffer, size, "absent");

ClockMeter.c

@@ -19,7 +19,7 @@ static const int ClockMeter_attributes[] = {
    CLOCK
 };
 
-static void ClockMeter_updateValues(Meter* this, char* buffer, int size) {
+static void ClockMeter_updateValues(Meter* this, char* buffer, size_t size) {
    time_t t = time(NULL);
    struct tm result;
    struct tm* lt = localtime_r(&t, &result);

DateMeter.c

@@ -19,7 +19,7 @@ static const int DateMeter_attributes[] = {
    DATE
 };
 
-static void DateMeter_updateValues(Meter* this, char* buffer, int size) {
+static void DateMeter_updateValues(Meter* this, char* buffer, size_t size) {
    time_t t = time(NULL);
    struct tm result;
    struct tm* lt = localtime_r(&t, &result);

DateTimeMeter.c

@@ -19,7 +19,7 @@ static const int DateTimeMeter_attributes[] = {
    DATETIME
 };
 
-static void DateTimeMeter_updateValues(Meter* this, char* buffer, int size) {
+static void DateTimeMeter_updateValues(Meter* this, char* buffer, size_t size) {
    time_t t = time(NULL);
    struct tm result;
    struct tm* lt = localtime_r(&t, &result);

DiskIOMeter.c

@@ -30,7 +30,7 @@ static unsigned long int cached_read_diff = 0;
 static unsigned long int cached_write_diff = 0;
 static double cached_utilisation_diff = 0.0;
 
-static void DiskIOMeter_updateValues(Meter* this, char* buffer, int len) {
+static void DiskIOMeter_updateValues(Meter* this, char* buffer, size_t len) {
    static unsigned long long int cached_last_update = 0;
 
    struct timeval tv;

HostnameMeter.c

@@ -19,7 +19,7 @@ static const int HostnameMeter_attributes[] = {
    HOSTNAME
 };
 
-static void HostnameMeter_updateValues(Meter* this, char* buffer, int size) {
+static void HostnameMeter_updateValues(Meter* this, char* buffer, size_t size) {
    (void) this;
    gethostname(buffer, size - 1);
 }

LoadAverageMeter.c

@@ -24,7 +24,7 @@ static const int LoadMeter_attributes[] = {
    LOAD
 };
 
-static void LoadAverageMeter_updateValues(Meter* this, char* buffer, int size) {
+static void LoadAverageMeter_updateValues(Meter* this, char* buffer, size_t size) {
    Platform_getLoadAverage(&this->values[0], &this->values[1], &this->values[2]);
    xSnprintf(buffer, size, "%.2f/%.2f/%.2f", this->values[0], this->values[1], this->values[2]);
 }
@@ -40,7 +40,7 @@ static void LoadAverageMeter_display(const Object* cast, RichString* out) {
    RichString_append(out, CRT_colors[LOAD_AVERAGE_FIFTEEN], buffer);
 }
 
-static void LoadMeter_updateValues(Meter* this, char* buffer, int size) {
+static void LoadMeter_updateValues(Meter* this, char* buffer, size_t size) {
    double five, fifteen;
    Platform_getLoadAverage(&this->values[0], &five, &fifteen);
    if (this->values[0] > this->total) {

MemoryMeter.c

@@ -19,7 +19,7 @@ static const int MemoryMeter_attributes[] = {
    MEMORY_CACHE
 };
 
-static void MemoryMeter_updateValues(Meter* this, char* buffer, int size) {
+static void MemoryMeter_updateValues(Meter* this, char* buffer, size_t size) {
    int written;
    Platform_setMemoryValues(this);
 

Meter.c

@@ -49,7 +49,7 @@ Meter* Meter_new(const struct ProcessList_* pl, int param, const MeterClass* typ
    return this;
 }
 
-int Meter_humanUnit(char* buffer, unsigned long int value, int size) {
+int Meter_humanUnit(char* buffer, unsigned long int value, size_t size) {
    const char* prefix = "KMGTPEZY";
    unsigned long int powi = 1;
    unsigned int powj = 1, precision = 2;
@@ -441,8 +441,7 @@ const MeterMode* const Meter_modes[] = {
 
 /* Blank meter */
 
-static void BlankMeter_updateValues(Meter* this, char* buffer, int size) {
+static void BlankMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, size_t size) {
-   (void) this; (void) buffer; (void) size;
    if (size > 0) {
       *buffer = 0;
    }

Meter.h

@@ -26,7 +26,7 @@ typedef struct Meter_ Meter;
 typedef void(*Meter_Init)(Meter*);
 typedef void(*Meter_Done)(Meter*);
 typedef void(*Meter_UpdateMode)(Meter*, int);
-typedef void(*Meter_UpdateValues)(Meter*, char*, int);
+typedef void(*Meter_UpdateValues)(Meter*, char*, size_t);
 typedef void(*Meter_Draw)(Meter*, int, int, int);
 
 typedef struct MeterClass_ {
@@ -101,7 +101,7 @@ extern const MeterClass Meter_class;
 
 Meter* Meter_new(const ProcessList* pl, int param, const MeterClass* type);
 
-int Meter_humanUnit(char* buffer, unsigned long int value, int size);
+int Meter_humanUnit(char* buffer, unsigned long int value, size_t size);
 
 void Meter_delete(Object* cast);
 

NetworkIOMeter.c

@@ -24,7 +24,7 @@ static unsigned long int cached_rxp_diff = 0;
 static unsigned long int cached_txb_diff = 0;
 static unsigned long int cached_txp_diff = 0;
 
-static void NetworkIOMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, int len) {
+static void NetworkIOMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, size_t len) {
    static unsigned long long int cached_last_update = 0;
 
    struct timeval tv;

SwapMeter.c

@@ -17,7 +17,7 @@ static const int SwapMeter_attributes[] = {
    SWAP
 };
 
-static void SwapMeter_updateValues(Meter* this, char* buffer, int size) {
+static void SwapMeter_updateValues(Meter* this, char* buffer, size_t size) {
    int written;
    Platform_setSwapValues(this);
 

TasksMeter.c

@@ -23,7 +23,7 @@ static const int TasksMeter_attributes[] = {
    TASKS_RUNNING
 };
 
-static void TasksMeter_updateValues(Meter* this, char* buffer, int len) {
+static void TasksMeter_updateValues(Meter* this, char* buffer, size_t len) {
    const ProcessList* pl = this->pl;
    this->values[0] = pl->kernelThreads;
    this->values[1] = pl->userlandThreads;

UptimeMeter.c

@@ -17,7 +17,7 @@ static const int UptimeMeter_attributes[] = {
    UPTIME
 };
 
-static void UptimeMeter_updateValues(Meter* this, char* buffer, int len) {
+static void UptimeMeter_updateValues(Meter* this, char* buffer, size_t len) {
    int totalseconds = Platform_getUptime();
    if (totalseconds == -1) {
       xSnprintf(buffer, len, "(unknown)");

linux/PressureStallMeter.c

@@ -25,7 +25,7 @@ static const int PressureStallMeter_attributes[] = {
    PRESSURE_STALL_THREEHUNDRED
 };
 
-static void PressureStallMeter_updateValues(Meter* this, char* buffer, int len) {
+static void PressureStallMeter_updateValues(Meter* this, char* buffer, size_t len) {
    const char* file;
    if (strstr(Meter_name(this), "CPU")) {
       file = "cpu";

linux/SELinuxMeter.c

@@ -70,7 +70,7 @@ static bool isSelinuxEnforcing(void) {
    return !!enforce;
 }
 
-static void SELinuxMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, int len) {
+static void SELinuxMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, size_t len) {
    enabled = isSelinuxEnabled();
    enforcing = isSelinuxEnforcing();
 

linux/SystemdMeter.c

@@ -229,7 +229,7 @@ static void updateViaExec(void) {
    fclose(commandOutput);
 }
 
-static void SystemdMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, int size) {
+static void SystemdMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, size_t size) {
    free(systemState);
    systemState = NULL;
    nFailedUnits = nInstalledJobs = nNames = nJobs = INVALID_VALUE;

linux/ZramMeter.c

@@ -11,7 +11,7 @@ static const int ZramMeter_attributes[] = {
    ZRAM
 };
 
-static void ZramMeter_updateValues(Meter* this, char* buffer, int size) {
+static void ZramMeter_updateValues(Meter* this, char* buffer, size_t size) {
    int written;
 
    Platform_setZramValues(this);
@@ -38,11 +38,15 @@ static void ZramMeter_updateValues(Meter* this, char* buffer, int size) {
    }
    *buffer++ = ')';
    size--;
-   if ((size -= written) > 0) {
+   if (size <= 0) {
+      return;
+   }
    *buffer++ = '/';
    size--;
-      Meter_humanUnit(buffer, this->total, size);
+   if (size <= 0) {
+      return;
    }
+   Meter_humanUnit(buffer, this->total, size);
 }
 
 static void ZramMeter_display(const Object* cast, RichString* out) {

zfs/ZfsArcMeter.c

@@ -33,7 +33,7 @@ void ZfsArcMeter_readStats(Meter* this, const ZfsArcStats* stats) {
    this->values[5] = stats->size;
 }
 
-static void ZfsArcMeter_updateValues(Meter* this, char* buffer, int size) {
+static void ZfsArcMeter_updateValues(Meter* this, char* buffer, size_t size) {
    int written;
    Platform_setZfsArcValues(this);
 

zfs/ZfsCompressedArcMeter.c

@@ -32,11 +32,11 @@ void ZfsCompressedArcMeter_readStats(Meter* this, const ZfsArcStats* stats) {
    }
 }
 
-static void ZfsCompressedArcMeter_printRatioString(const Meter* this, char* buffer, int size) {
+static void ZfsCompressedArcMeter_printRatioString(const Meter* this, char* buffer, size_t size) {
    xSnprintf(buffer, size, "%.2f:1", this->total / this->values[0]);
 }
 
-static void ZfsCompressedArcMeter_updateValues(Meter* this, char* buffer, int size) {
+static void ZfsCompressedArcMeter_updateValues(Meter* this, char* buffer, size_t size) {
    Platform_setZfsCompressedArcValues(this);
 
    ZfsCompressedArcMeter_printRatioString(this, buffer, size);