Remove atoi() dependency, only need stdlib.h in Fixture for malloc

 For redefinition of UNITY_FIXTURE_MALLOC/...FREE use both or replace both.
 Clean up whitespace, remaining void*, and comment.

extras/fixture/src/unity_fixture.c

@@ -149,21 +149,12 @@ void UnityMalloc_MakeMallocFailAfterCount(int countdown)
     malloc_fail_countdown = countdown;
 }
 
-#ifdef malloc
+// These definitions are always included from unity_fixture_malloc_overrides.h
+// We undef to use them or avoid conflict with <stdlib.h> per the C standard
 #undef malloc
-#endif
-
-#ifdef free
 #undef free
-#endif
-
-#ifdef calloc
 #undef calloc
-#endif
-
-#ifdef realloc
 #undef realloc
-#endif
 
 #include <stdlib.h>
 
@@ -290,7 +281,7 @@ void UnityPointer_Init(void)
     pointer_index = 0;
 }
 
-void UnityPointer_Set(void ** pointer, void * newValue)
+void UnityPointer_Set(void** pointer, void* newValue)
 {
     if (pointer_index >= MAX_POINTERS)
     {
@@ -311,8 +302,7 @@ void UnityPointer_UndoAllSets(void)
     {
         pointer_index--;
         *(pointer_store[pointer_index].pointer) =
-        pointer_store[pointer_index].old_value;
-
+            pointer_store[pointer_index].old_value;
     }
 }
 
@@ -373,7 +363,13 @@ int UnityGetCommandLineOptions(int argc, const char* argv[])
             {
                 if (*(argv[i]) >= '0' && *(argv[i]) <= '9')
                 {
-                    UnityFixture.RepeatCount = atoi(argv[i]);
+                    unsigned int digit = 0;
+                    UnityFixture.RepeatCount = 0;
+                    while (argv[i][digit] >= '0' && argv[i][digit] <= '9')
+                    {
+                        UnityFixture.RepeatCount *= 10;
+                        UnityFixture.RepeatCount += (unsigned int)argv[i][digit++] - '0';
+                    }
                     i++;
                 }
             }

extras/fixture/src/unity_fixture_malloc_overrides.h

@@ -10,26 +10,17 @@
 
 #include <stddef.h>
 
-// This function is used by the Unity Fixture to allocate memory on
-// the heap and can be overridden with platform-specific heap
-// implementations. For example, when using FreeRTOS
-// UNITY_FIXTURE_MALLOC becomes pvPortMalloc().
-
-#ifndef UNITY_FIXTURE_MALLOC
-   #define UNITY_FIXTURE_MALLOC( SIZE ) malloc( ( SIZE ) )
-#else
-   extern void * UNITY_FIXTURE_MALLOC(size_t size);
-#endif
-
-// This function is used by the Unity Fixture to release memory in the
-// heap and can be overridden with platform-specific heap
-// implementations. For example, when using FreeRTOS
-// UNITY_FIXTURE_FREE becomes vPortFree().
-
-#ifndef UNITY_FIXTURE_FREE
-   #define UNITY_FIXTURE_FREE( PTR ) free( ( PTR ) )
+// These functions are used by the Unity Fixture to allocate and release memory
+// on the heap and can be overridden with platform-specific implementations.
+// For example, when using FreeRTOS UNITY_FIXTURE_MALLOC becomes pvPortMalloc()
+// and UNITY_FIXTURE_FREE becomes vPortFree().
+
+#if !defined(UNITY_FIXTURE_MALLOC) || !defined(UNITY_FIXTURE_FREE)
+    #define UNITY_FIXTURE_MALLOC(size) malloc(size)
+    #define UNITY_FIXTURE_FREE(ptr)    free(ptr)
 #else
-   extern void UNITY_FIXTURE_FREE(void *ptr);
+    extern void* UNITY_FIXTURE_MALLOC(size_t size);
+    extern void UNITY_FIXTURE_FREE(void* ptr);
 #endif
 
 #define malloc  unity_malloc