usr/src/lib/libc/stdio/rewind.c

/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific written prior permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rewind.c    5.3 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/file.h>
#include <stdio.h>

rewind(iop)
        register FILE *iop;
{
        off_t lseek();

        (void)fflush(iop);
        (void)lseek(fileno(iop), 0L, L_SET);
        iop->_cnt = 0;
        iop->_ptr = iop->_base;
        iop->_flag &= ~(_IOERR|_IOEOF);
        if (iop->_flag & _IORW)
                iop->_flag &= ~(_IOREAD|_IOWRT);
}