void bvprintf(struct charbuf *buf, char *format, va_list al);
void bprintf(struct charbuf *buf, char *format, ...);
void replstr(char **p, char *n);
void bvprintf(struct charbuf *buf, char *format, va_list al);
void bprintf(struct charbuf *buf, char *format, ...);
void replstr(char **p, char *n);