Bugfix/bacnet array encoding overflows (#414)

* Add common BACnetARRAY encode function to fix Device object list buffer overflow. Refactor device, analog-output, access-door and binary-output objects to use common BACnetARRAY encoder.

* Fix non-POSIX builds (win32).

* Cleanup some ports/stm32 build warnings
---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

src/bacnet/basic/object/bacfile.c

@@ -98,6 +98,20 @@ void BACfile_Property_Lists(
     return;
 }
 
+/**
+ * @brief duplicate a string (replacement for POSIX strdup)
+ * @param  s - string to duplicate
+ * @return a pointer to a new string on success, or a null pointer
+ */
+static char *bacfile_strdup(const char *s) {
+    size_t size = strlen(s) + 1;
+    char *p = malloc(size);
+    if (p != NULL) {
+        memcpy(p, s, size);
+    }
+    return p;
+}
+
 /**
  * @brief For a given object instance-number, returns the pathname
  * @param  object_instance - object-instance number of the object
@@ -130,7 +144,7 @@ void bacfile_pathname_set(uint32_t object_instance, const char *pathname)
         if (pObject->Pathname) {
             free(pObject->Pathname);
         }
-        pObject->Pathname = strdup(pathname);
+        pObject->Pathname = bacfile_strdup(pathname);
     }
 }
 
@@ -409,10 +423,10 @@ void bacfile_file_type_set(
         if (pObject->File_Type) {
             if (strcmp(pObject->File_Type, mime_type) != 0) {
                 free(pObject->File_Type);
-                pObject->File_Type = strdup(mime_type);
+                pObject->File_Type = bacfile_strdup(mime_type);
             }
         } else {
-            pObject->File_Type = strdup(mime_type);
+            pObject->File_Type = bacfile_strdup(mime_type);
         }
     }
 }