#include <stdio.h> rewind(iop) register struct _iobuf *iop; { fflush(iop); lseek(fileno(iop), 0L, 0); iop->_cnt = 0; iop->_ptr = iop->_base; iop->_flag &= ~(_IOERR|_IOEOF); if (iop->_flag & _IORW) iop->_flag &= ~(_IOREAD|_IOWRT); }