diff --git a/docs/CMock_Summary.md b/docs/CMock_Summary.md
index 28e2a48..b78327d 100644
--- a/docs/CMock_Summary.md
+++ b/docs/CMock_Summary.md
@@ -881,6 +881,29 @@ based on other settings, particularly Unity's settings.
   This needs to be something big enough to point anywhere in Cmock's
   memory space... usually it's a size_t.
 
+* `CMOCK_MEMCPY`
+  The memory-copy function used by CMock's internals and the generated mocks. 
+  It defaults to `memcpy` from `<string.h>`. Override alongside `CMOCK_MEMSET` 
+  to supply a custom implementation on targets where the standard library is 
+  unavailable or undesirable:
+
+  ```c
+  #define CMOCK_MEMCPY(dst, src, size) my_memcpy(dst, src, size)
+  ```
+
+* `CMOCK_MEMSET`
+  The memory-set function used by CMock's internals to zero-initialize
+  allocated blocks. It defaults to `memset` from `<string.h>`. Override
+  alongside `CMOCK_MEMCPY` to keep CMock fully independent of the standard
+  library:
+
+  ```c
+  #define CMOCK_MEMSET(dst, val, size) my_memset(dst, val, size)
+  ```
+
+  If both `CMOCK_MEMCPY` and `CMOCK_MEMSET` are defined before including
+  `cmock.h`, CMock will not pull in `<string.h>` at all.
+
 Other Tips
 ==========
 
diff --git a/lib/cmock_generator_plugin_return_thru_ptr.rb b/lib/cmock_generator_plugin_return_thru_ptr.rb
index b3bb08f..a821826 100644
--- a/lib/cmock_generator_plugin_return_thru_ptr.rb
+++ b/lib/cmock_generator_plugin_return_thru_ptr.rb
@@ -83,7 +83,7 @@ class CMockGeneratorPluginReturnThruPtr
       lines << "      cmock_call_instance->ReturnThruPtr_#{arg_name}_Used)\n"
       lines << "  {\n"
       lines << "    UNITY_TEST_ASSERT_NOT_NULL(#{arg_name}, cmock_line, CMockStringPtrIsNULL);\n"
-      lines << "    memcpy((void*)#{arg_name}, (const void*)cmock_call_instance->ReturnThruPtr_#{arg_name}_Val,\n"
+      lines << "    CMOCK_MEMCPY((void*)#{arg_name}, (const void*)cmock_call_instance->ReturnThruPtr_#{arg_name}_Val,\n"
       lines << "      cmock_call_instance->ReturnThruPtr_#{arg_name}_Size);\n"
       lines << "  }\n"
     end
@@ -136,7 +136,7 @@ class CMockGeneratorPluginReturnThruPtr
       lines << "  if (cmock_call_instance->ReturnThruPtr_#{arg_name}_Used)\n"
       lines << "  {\n"
       lines << "    UNITY_TEST_ASSERT_NOT_NULL(#{arg_name}, cmock_line, CMockStringPtrIsNULL);\n"
-      lines << "    memcpy((void*)#{arg_name}, (const void*)cmock_call_instance->ReturnThruPtr_#{arg_name}_Val,\n"
+      lines << "    CMOCK_MEMCPY((void*)#{arg_name}, (const void*)cmock_call_instance->ReturnThruPtr_#{arg_name}_Val,\n"
       lines << "      cmock_call_instance->ReturnThruPtr_#{arg_name}_Size);\n"
       lines << "  }\n"
     end
diff --git a/src/cmock.c b/src/cmock.c
index 28f276f..1cc1725 100644
--- a/src/cmock.c
+++ b/src/cmock.c
@@ -68,7 +68,7 @@ CMOCK_MEM_INDEX_TYPE CMock_Guts_MemNew(CMOCK_MEM_INDEX_TYPE size)
 
     /* determine where we're putting this new block, and init its pointer to be the end of the line */
     index = CMock_Guts_FreePtr + CMOCK_MEM_INDEX_SIZE;
-    *(CMOCK_MEM_INDEX_TYPE*)(&CMock_Guts_Buffer[CMock_Guts_FreePtr]) = CMOCK_GUTS_NONE;
+    CMOCK_MEMSET(&CMock_Guts_Buffer[CMock_Guts_FreePtr], 0, CMOCK_MEM_INDEX_SIZE);
     CMock_Guts_FreePtr += size;
 
     return index;
@@ -108,7 +108,7 @@ CMOCK_MEM_INDEX_TYPE CMock_Guts_MemChain(CMOCK_MEM_INDEX_TYPE root_index, CMOCK_
         next = root;
         do
         {
-            index = *(CMOCK_MEM_INDEX_TYPE*)((CMOCK_MEM_PTR_AS_INT)next - CMOCK_MEM_INDEX_SIZE);
+            CMOCK_MEMCPY(&index, (unsigned char*)next - CMOCK_MEM_INDEX_SIZE, sizeof(index));
             if (index >= CMock_Guts_FreePtr)
             {
                 return CMOCK_GUTS_NONE;
@@ -119,7 +119,10 @@ CMOCK_MEM_INDEX_TYPE CMock_Guts_MemChain(CMOCK_MEM_INDEX_TYPE root_index, CMOCK_
             }
         }
         while (index > 0);
-        *(CMOCK_MEM_INDEX_TYPE*)((CMOCK_MEM_PTR_AS_INT)next - CMOCK_MEM_INDEX_SIZE) = (CMOCK_MEM_INDEX_TYPE)((CMOCK_MEM_PTR_AS_INT)obj - (CMOCK_MEM_PTR_AS_INT)CMock_Guts_Buffer);
+        {
+            CMOCK_MEM_INDEX_TYPE tmp = (CMOCK_MEM_INDEX_TYPE)((unsigned char*)obj - CMock_Guts_Buffer);
+            CMOCK_MEMCPY((unsigned char*)next - CMOCK_MEM_INDEX_SIZE, &tmp, sizeof(tmp));
+        }
         return root_index;
     }
 }
@@ -141,7 +144,7 @@ CMOCK_MEM_INDEX_TYPE CMock_Guts_MemNext(CMOCK_MEM_INDEX_TYPE previous_item_index
 
     /* if the pointer is good, then use it to look up the next index
      * (we know the first element always goes in zero, so NEXT must always be > 1) */
-    index = *(CMOCK_MEM_INDEX_TYPE*)((CMOCK_MEM_PTR_AS_INT)previous_item - CMOCK_MEM_INDEX_SIZE);
+    CMOCK_MEMCPY(&index, (unsigned char*)previous_item - CMOCK_MEM_INDEX_SIZE, sizeof(index));
     if ((index > 1) && (index < CMock_Guts_FreePtr))
     {
         return index;
diff --git a/src/cmock_internals.h b/src/cmock_internals.h
index 3877296..b3d23f5 100644
--- a/src/cmock_internals.h
+++ b/src/cmock_internals.h
@@ -83,6 +83,18 @@ extern const char* CMockStringMismatch;
     #define CMOCK_MEM_SIZE (32768)
 #endif
 
+/* memory copy/set functions used by CMock internals and generated mocks.
+ * Override to use custom implementations on targets without standard libc. */
+#if !defined(CMOCK_MEMCPY) || !defined(CMOCK_MEMSET)
+    #include <string.h>
+    #ifndef CMOCK_MEMCPY
+        #define CMOCK_MEMCPY(a, b, c) memcpy(a, b, c)
+    #endif
+    #ifndef CMOCK_MEMSET
+        #define CMOCK_MEMSET(a, b, c) memset(a, b, c)
+    #endif
+#endif
+
 /* automatically calculated defs for easier reading */
 #define CMOCK_MEM_ALIGN_SIZE  (CMOCK_MEM_INDEX_TYPE)(1u << CMOCK_MEM_ALIGN)
 #define CMOCK_MEM_ALIGN_MASK  (CMOCK_MEM_INDEX_TYPE)(CMOCK_MEM_ALIGN_SIZE - 1)
diff --git a/test/unit/cmock_generator_plugin_return_thru_ptr_test.rb b/test/unit/cmock_generator_plugin_return_thru_ptr_test.rb
index 021eb5c..d38cde2 100644
--- a/test/unit/cmock_generator_plugin_return_thru_ptr_test.rb
+++ b/test/unit/cmock_generator_plugin_return_thru_ptr_test.rb
@@ -193,13 +193,13 @@ describe CMockGeneratorPluginReturnThruPtr, "Verify CMockGeneratorPluginReturnTh
       "  if (cmock_call_instance->ReturnThruPtr_tofu_Used)\n" +
       "  {\n" +
       "    UNITY_TEST_ASSERT_NOT_NULL(tofu, cmock_line, CMockStringPtrIsNULL);\n" +
-      "    memcpy((void*)tofu, (const void*)cmock_call_instance->ReturnThruPtr_tofu_Val,\n" +
+      "    CMOCK_MEMCPY((void*)tofu, (const void*)cmock_call_instance->ReturnThruPtr_tofu_Val,\n" +
       "      cmock_call_instance->ReturnThruPtr_tofu_Size);\n" +
       "  }\n" +
       "  if (cmock_call_instance->ReturnThruPtr_bean_buffer_Used)\n" +
       "  {\n" +
       "    UNITY_TEST_ASSERT_NOT_NULL(bean_buffer, cmock_line, CMockStringPtrIsNULL);\n" +
-      "    memcpy((void*)bean_buffer, (const void*)cmock_call_instance->ReturnThruPtr_bean_buffer_Val,\n" +
+      "    CMOCK_MEMCPY((void*)bean_buffer, (const void*)cmock_call_instance->ReturnThruPtr_bean_buffer_Val,\n" +
       "      cmock_call_instance->ReturnThruPtr_bean_buffer_Size);\n" +
       "  }\n"