usr/src/lib/libI77/rewind.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)rewind.c    5.2     7/30/85
 */

/*
 * rewind.c  -  f77 file rewind
 */

#include "fio.h"

static char     rwnd[]  = "rewind";

f_rew(a) alist *a;
{       int n;
        unit *b;

        lfname = NULL;
        elist = NO;
        external = YES;                 /* for err */
        lunit = a->aunit;
        errflag = a->aerr;
        if(not_legal(lunit)) err(errflag,F_ERUNIT,rwnd)
        b = &units[lunit];
        if(!b->ufd) return(OK);
        lfname = b->ufnm;
        if(!b->useek) err(errflag,F_ERNOBKSP,rwnd)
        b->uend = NO;
        if(b->uwrt)
                if(n=t_runc(b,errflag,rwnd)) return(n);
        rewind(b->ufd);
        return(OK);
}