[readline] Add replace_string()

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/editstring.c

@@ -117,6 +117,17 @@ static void kill_eol ( struct edit_string *string ) {
 	insert_delete ( string, ~( ( size_t ) 0 ), NULL );
 }
 
+/**
+ * Replace editable string
+ *
+ * @v string		Editable string
+ * @v replacement	Replacement string
+ */
+void replace_string ( struct edit_string *string, const char *replacement ) {
+	string->cursor = 0;
+	insert_delete ( string, ~( ( size_t ) 0 ), replacement );
+}
+
 /**
  * Edit editable string
  *

src/include/ipxe/editstring.h

@@ -41,6 +41,8 @@ static inline void init_editstring ( struct edit_string *string, char *buf,
 	string->len = len;
 }
 
+extern void replace_string ( struct edit_string *string,
+			     const char *replacement ) __nonnull;
 extern int edit_string ( struct edit_string *string, int key ) __nonnull;
 
 #endif /* _IPXE_EDITSTRING_H */