ref: 8188b4f4f0e07b6669e6ae3c6c1099af917eaab4
dir: /sys/src/cmd/9660srv/fns.h/
void chat(char*, ...); void* ealloc(long); void error(char*); Iobuf* getbuf(Xdata*, ulong, ulong); Xdata* getxdata(char*); void iobuf_init(void); void nexterror(void); void panic(int, char*, ...); void purgebuf(Xdata*); void putbuf(Iobuf*); void refxfs(Xfs*, int); void showdir(int, Dir*); Xfile* xfile(int, int); void setnames(Dir*, char*); #define waserror() (++nerr_lab, setjmp(err_lab[nerr_lab-1])) #define poperror() (--nerr_lab)