#define FILE struct _iobuf
#define stdout (&_iob[1])
#define stderr (&_iob[2])
#define getc(p) (--(p)->_cnt>=0? *(p)->_ptr++&0377:_filbuf(p))
#define getchar() getc(stdin)
#define putc(x,p) (--(p)->_cnt>=0? ((int)(*(p)->_ptr++=(unsigned)(x))):_flsbuf((unsigned)(x),p))
#define putchar(x) putc(x,stdout)
#define feof(p) (((p)->_flag&_IOEOF)!=0)
#define ferror(p) (((p)->_flag&_IOERR)!=0)
#define fileno(p) p->_file