Clean up some needless malloc casts, convert some mallocs to callocs, and fix some style

FunctionBar.c

@@ -52,8 +52,8 @@ FunctionBar* FunctionBar_new(const char** functions, const char** keys, int* eve
    }
    if (keys && events) {
       this->staticData = false; 
-      this->keys = malloc(sizeof(char*) * 15);
+      this->keys = calloc(15, sizeof(char*));
-      this->events = malloc(sizeof(int) * 15);
+      this->events = calloc(15, sizeof(int));
       int i = 0;
       while (i < 15 && functions[i]) {
          this->keys[i] = strdup(keys[i]);

Hashtable.c

@@ -63,7 +63,7 @@ int Hashtable_count(Hashtable* this) {
 static HashtableItem* HashtableItem_new(unsigned int key, void* value) {
    HashtableItem* this;
    
-   this = (HashtableItem*) malloc(sizeof(HashtableItem));
+   this = malloc(sizeof(HashtableItem));
    this->key = key;
    this->value = value;
    this->next = NULL;
@@ -73,7 +73,7 @@ static HashtableItem* HashtableItem_new(unsigned int key, void* value) {
 Hashtable* Hashtable_new(int size, bool owner) {
    Hashtable* this;
    
-   this = (Hashtable*) malloc(sizeof(Hashtable));
+   this = malloc(sizeof(Hashtable));
    this->items = 0;
    this->size = size;
    this->buckets = (HashtableItem**) calloc(size, sizeof(HashtableItem*));

OpenFilesScreen.c

@@ -58,7 +58,7 @@ static const char* OpenFilesScreenKeys[] = {"F3", "F4", "F5", "Esc"};
 static int OpenFilesScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(5), 27};
 
 OpenFilesScreen* OpenFilesScreen_new(Process* process) {
-   OpenFilesScreen* this = (OpenFilesScreen*) malloc(sizeof(OpenFilesScreen));
+   OpenFilesScreen* this = malloc(sizeof(OpenFilesScreen));
    this->process = process;
    FunctionBar* bar = FunctionBar_new(OpenFilesScreenFunctions, OpenFilesScreenKeys, OpenFilesScreenEvents);
    this->display = Panel_new(0, 1, COLS, LINES-3, false, Class(ListItem), bar);

StringUtils.c

@@ -55,13 +55,13 @@ inline int String_eq(const char* s1, const char* s2) {
 char** String_split(const char* s, char sep, int* n) {
    *n = 0;
    const int rate = 10;
-   char** out = (char**) malloc(sizeof(char*) * rate);
+   char** out = calloc(rate, sizeof(char**));
    int ctr = 0;
    int blocks = rate;
    char* where;
    while ((where = strchr(s, sep)) != NULL) {
       int size = where - s;
-      char* token = (char*) malloc(size + 1);
+      char* token = malloc(size + 1);
       strncpy(token, s, size);
       token[size] = '\0';
       out[ctr] = token;
@@ -80,7 +80,7 @@ char** String_split(const char* s, char sep, int* n) {
    }
    if (s[0] != '\0') {
       int size = strlen(s);
-      char* token = (char*) malloc(size + 1);
+      char* token = malloc(size + 1);
       strncpy(token, s, size + 1);
       out[ctr] = token;
       ctr++;

TraceScreen.c

@@ -44,7 +44,7 @@ static const char* TraceScreenKeys[] = {"F3", "F4", "F8", "F9", "Esc"};
 static int TraceScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(8), KEY_F(9), 27};
 
 TraceScreen* TraceScreen_new(Process* process) {
-   TraceScreen* this = (TraceScreen*) malloc(sizeof(TraceScreen));
+   TraceScreen* this = malloc(sizeof(TraceScreen));
    this->process = process;
    FunctionBar* fuBar = FunctionBar_new(TraceScreenFunctions, TraceScreenKeys, TraceScreenEvents);
    this->display = Panel_new(0, 1, COLS, LINES-2, false, Class(ListItem), fuBar);

Vector.c

@@ -37,7 +37,7 @@ Vector* Vector_new(ObjectClass* type, bool owner, int size) {
 
    if (size == DEFAULT_SIZE)
       size = 10;
-   this = (Vector*) malloc(sizeof(Vector));
+   this = malloc(sizeof(Vector));
    this->growthRate = size;
    this->array = (Object**) calloc(size, sizeof(Object*));
    this->arraySize = size;

darwin/DarwinProcessList.c

@@ -73,10 +73,8 @@ unsigned ProcessList_allocateCPULoadInfo(processor_cpu_load_info_t *p) {
 void ProcessList_getVMStats(vm_statistics64_t p) {
     mach_msg_type_number_t info_size = HOST_VM_INFO64_COUNT;
 
-    if(0 != host_statistics64(mach_host_self(), HOST_VM_INFO64, (host_info_t)p, &info_size)) {
+    if (host_statistics64(mach_host_self(), HOST_VM_INFO64, (host_info_t)p, &info_size) != 0)
-       fprintf(stderr, "Unable to retrieve VM statistics\n");
+       err(9, "Unable to retrieve VM statistics\n");
-       exit(9);
-    }
 }
 
 struct kinfo_proc *ProcessList_getKInfoProcs(size_t *count) {
@@ -88,21 +86,15 @@ struct kinfo_proc *ProcessList_getKInfoProcs(size_t *count) {
     * process entry or two.
     */
    *count = 0;
-   if(0 > sysctl(mib, 4, NULL, count, NULL, 0)) {
+   if (sysctl(mib, 4, NULL, count, NULL, 0) < 0)
-      fprintf(stderr, "Unable to get size of kproc_infos");
+      err(5, "Unable to get size of kproc_infos");
-      exit(5);
-   }
 
-   processes = (struct kinfo_proc *)malloc(*count);
+   processes = malloc(*count);
-   if(NULL == processes) {
+   if (processes == NULL)
-      fprintf(stderr, "Out of memory for kproc_infos\n");
+      err(6, "Out of memory for kproc_infos");
-      exit(6);
-   }
 
-   if(0 > sysctl(mib, 4, processes, count, NULL, 0)) {
+   if (sysctl(mib, 4, processes, count, NULL, 0) < 0)
-      fprintf(stderr, "Unable to get kinfo_procs\n");
+      err(7, "Unable to get kinfo_procs");
-      exit(7);
-   }
 
    *count = *count / sizeof(struct kinfo_proc);
 

freebsd/FreeBSDProcessList.c

@@ -115,7 +115,7 @@ char* FreeBSDProcessList_readProcessName(kvm_t* kd, struct kinfo_proc* kproc, in
    for (int i = 0; argv[i]; i++) {
       len += strlen(argv[i]) + 1;
    }
-   char* comm = malloc(len * sizeof(char));
+   char* comm = malloc(len);
    char* at = comm;
    *basenameEnd = 0;
    for (int i = 0; argv[i]; i++) {