add fill_pathname_parent_dir_name function

libretro-common/file/file_path.c

@@ -594,6 +594,28 @@ void fill_pathname_basedir_noext(char *out_dir,
    path_remove_extension(out_dir);
 }
 
+/**
+ * fill_pathname_parent_dir_name:
+ * @out_dir            : output directory
+ * @in_dir             : input directory
+ * @size               : size of output directory
+ *
+ * Copies only the parent directory name of @in_dir into @out_dir.
+ * The two buffers must not overlap. Removes trailing '/'.
+ **/
+void fill_pathname_parent_dir_name(char *out_dir,
+      const char *in_dir, size_t size)
+{
+   char *temp = strdup(in_dir);
+   char *last = find_last_slash(temp);
+
+   *last = '\0';
+
+   in_dir = find_last_slash(temp) + 1;
+
+   strlcpy(out_dir, in_dir, size);
+}
+
 /**
  * fill_pathname_parent_dir:
  * @out_dir            : output directory

libretro-common/include/file/file_path.h

@@ -290,6 +290,18 @@ void fill_pathname_basedir(char *out_path, const char *in_path, size_t size);
 void fill_pathname_basedir_noext(char *out_dir,
       const char *in_path, size_t size);
 
+/**
+ * fill_pathname_parent_dir_name:
+ * @out_dir            : output directory
+ * @in_dir             : input directory
+ * @size               : size of output directory
+ *
+ * Copies only the parent directory name of @in_dir into @out_dir.
+ * The two buffers must not overlap. Removes trailing '/'.
+ **/
+void fill_pathname_parent_dir_name(char *out_dir,
+      const char *in_dir, size_t size);
+
 /**
  * fill_pathname_parent_dir:
  * @out_dir            : output directory