void ds_put_char_multiple(struct ds *, char, size_t n);
void ds_put_buffer(struct ds *, const char *, size_t n);
void ds_put_cstr(struct ds *, const char *);
void ds_put_char_multiple(struct ds *, char, size_t n);
void ds_put_buffer(struct ds *, const char *, size_t n);
void ds_put_cstr(struct ds *, const char *);