2.9BSD/usr/src/lib/c/stdio/rew.c

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/*	@(#)rew.c	2.1	SCCS id keyword	*/
#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);
}