Feature: add f_string_static as a non-allocated alternative to f_string_dynamic

That is not to say that a dynamically allocated buffer cannot be placed in its string part.
Instead, it communicates that this is not never be allocated or deallocated directly.

This is implemented in such a way that f_string_dynamic is a sub-type of f_string_static.
This should allow for easy type conversions.

diff --git a/level_0/f_string/c/string.h b/level_0/f_string/c/string.h
index 5fc1b8db4ae2cab77e812fe860919ee52585ccc9..e8bb990bc0e77396f96da4433461ade2950d8136 100644 (file)
--- a/level_0/f_string/c/string.h
+++ b/level_0/f_string/c/string.h
@@ -204,28 +204,48 @@ extern "C" {
 #endif // _di_f_string_ranges_
 
 /**
- * A string that supports contains a size attribute to handle dynamic allocations and deallocations.
+ * A string that is analogous to f_string_dynamic but intended for static-only uses.
  *
- * Save the string size along with the string, so that strlen(..) commands can be avoided as much as possible.
+ * The f_string_static type should never be directly allocated or deallocated.
  *
  * string: the string.
- * size: total amount of allocated space.
- * used: total number of allocated spaces used.
+ * size: total amount of space available.
+ * used: total number of space used.
  */
-#ifndef _di_f_string_dynamic_
+#ifndef _di_f_string_static_
   typedef struct {
     f_string string;
 
     f_string_length size;
     f_string_length used;
-  } f_string_dynamic;
+  } f_string_static;
 
-  #define f_string_dynamic_initialize { f_string_initialize, 0, 0 }
+  #define f_string_static_initialize { 0, 0, 0 }
 
-  #define f_macro_string_dynamic_clear(dynamic) \
-    dynamic.string = 0; \
-    dynamic.size = 0; \
-    dynamic.used = 0;
+  #define f_macro_string_static_clear(string_static) \
+    string_static.string = 0; \
+    string_static.size = 0; \
+    string_static.used = 0;
+#endif // _di_f_string_static_
+
+/**
+ * A string that supports contains a size attribute to handle dynamic allocations and deallocations.
+ *
+ * Save the string size along with the string, so that strlen(..) commands can be avoided as much as possible.
+ *
+ * This is a sub-type of f_string_static, allowing it to be passed into any f_string_static type.
+ * It is recommended that f_string_static are not otherwise casted into f_string_dynamic to avoid potential memory allocation issues.
+ *
+ * string: the string.
+ * size: total amount of allocated space.
+ * used: total number of allocated spaces used.
+ */
+#ifndef _di_f_string_dynamic_
+  typedef f_string_static f_string_dynamic;
+
+  #define f_string_dynamic_initialize f_string_static_initialize
+
+  #define f_macro_string_dynamic_clear(dynamic) f_macro_string_static_clear(dynamic)
 
   #define f_macro_string_dynamic_new(status, dynamic, new_length) \
     f_macro_string_dynamic_clear(dynamic) \