int dbuf_vprintf(struct dbuf_s *dbuf, const char *format, va_list args);
int dbuf_printf (struct dbuf_s *dbuf, const char *format, ...) ATTRIBUTE_PRINTF(2, 3);
size_t dbuf_getline(struct dbuf_s *dbuf, FILE *infp);
int dbuf_vprintf(struct dbuf_s *dbuf, const char *format, va_list args);
int dbuf_printf (struct dbuf_s *dbuf, const char *format, ...) ATTRIBUTE_PRINTF(2, 3);
size_t dbuf_getline(struct dbuf_s *dbuf, FILE *infp);