object: add a range of string transformation functions

object/include/blue/object/string.h

@@ -4,6 +4,7 @@
 #include <blue/core/status.h>
 #include <blue/object/object.h>
 #include <blue/object/type.h>
+#include <ctype.h>
 
 struct b_stream;
 
@@ -34,7 +35,19 @@ static inline void b_string_release(b_string *str)
 }
 BLUE_API char *b_string_steal(b_string *str);
 BLUE_API b_status b_string_reserve(b_string *str, size_t capacity);
+BLUE_API b_status b_string_replace(
+	b_string *str, size_t start, size_t length, const char *new_data);
 BLUE_API b_status b_string_replace_all(b_string *str, const char *new_data);
+BLUE_API b_status b_string_remove(b_string *str, size_t start, size_t length);
+BLUE_API b_status b_string_transform(b_string *str, int (*transformer)(int));
+static inline b_status b_string_toupper(b_string *str)
+{
+	return b_string_transform(str, toupper);
+}
+static inline b_status b_string_tolower(b_string *str)
+{
+	return b_string_transform(str, tolower);
+}
 BLUE_API b_status b_string_open_stream(b_string *str, struct b_stream **out);
 
 BLUE_API void b_string_append_s(b_string *dest, const b_string *src);