__attribute__((format (printf,2,0)))
extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
extern void strbuf_add_lines(struct strbuf *sb, const char *prefix, const char *buf, size_t size);
__attribute__((format (printf,2,0)))
extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
extern void strbuf_add_lines(struct strbuf *sb, const char *prefix, const char *buf, size_t size);