int kfile_print(struct KFile *fd, const char *s);
int kfile_gets(struct KFile *fd, char *buf, int size);
int kfile_gets_echo(struct KFile *fd, char *buf, int size, bool echo);
int kfile_print(struct KFile *fd, const char *s);
int kfile_gets(struct KFile *fd, char *buf, int size);
int kfile_gets_echo(struct KFile *fd, char *buf, int size, bool echo);