[unix-history] / 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);
}
Commit	Line	Data
4f284fb2	1	/*
161423a6 RE	2	* Copyright (c) 1980 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
4f284fb2	5	*
95f51977	6	* @(#)rewind.c 5.2 7/30/85
161423a6 RE	7	*/
	8
	9	/*
4f284fb2 DW	10	* rewind.c - f77 file rewind
	11	*/
	12
	13	#include "fio.h"
	14
331ef099 DW	15	static char rwnd[] = "rewind";
331ef099 DW	16
4f284fb2 DW	17	f_rew(a) alist *a;
	18	{ int n;
	19	unit *b;
	20
	21	lfname = NULL;
	22	elist = NO;
	23	external = YES; /* for err */
	24	lunit = a->aunit;
	25	errflag = a->aerr;
331ef099	26	if(not_legal(lunit)) err(errflag,F_ERUNIT,rwnd)
4f284fb2	27	b = &units[lunit];
afe045b5	28	if(!b->ufd) return(OK);
4f284fb2	29	lfname = b->ufnm;
331ef099	30	if(!b->useek) err(errflag,F_ERNOBKSP,rwnd)
4f284fb2 DW	31	b->uend = NO;
4f284fb2 DW	32	if(b->uwrt)
331ef099	33	if(n=t_runc(b,errflag,rwnd)) return(n);
4f284fb2 DW	34	rewind(b->ufd);
	35	return(OK);
	36	}