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/* dsopen.c - dsopen */

#include <conf.h>
#include <kernel.h>
#include <disk.h>
#include <lfile.h>
#include <dir.h>

/*------------------------------------------------------------------------
 *  dsopen  --  open/create a file on the specified disk device
 *------------------------------------------------------------------------
 */
#ifdef	Ndf
dsopen(devptr, filenam, mode)
struct	devsw	*devptr;
char	*filenam;
char	*mode;
{
	struct	dir	*dirptr;
	struct	flblk	*flptr;
	struct	fdes	*fdptr;
	DBADDR	dba;
	int	mbits, findex;
	int	retcode;
	char	ps;

	disable(ps);
	dirptr = dsdirec(devptr->dvnum);
	if ( (mbits=ckmode(mode)) == SYSERR)
		retcode = SYSERR;
	else if( (int)(fdptr=dfdsrch(devptr->dvioblk,filenam,mbits))
		== SYSERR)
		retcode = SYSERR;
	else if ( (findex=dfalloc()) == SYSERR)
		retcode = SYSERR;
	else {
		flptr = &fltab[findex];
		flptr->fl_dev = devptr->dvnum;
		flptr->fl_dent = fdptr;
		flptr->fl_mode = mbits & FLRW;
		flptr->fl_iba = fdptr->fdiba;
		ibget(flptr->fl_dev, flptr->fl_iba, &(flptr->fl_iblk));
		flptr->fl_pos = 0L;
		flptr->fl_dch = FALSE;
		dba = flptr->fl_iblk.ib_dba[flptr->fl_ipnum = 0];
		if (dba != DBNULL) {
			read(flptr->fl_dev, flptr->fl_buff, dba);
			flptr->fl_bptr = flptr->fl_buff;
		} else
			flptr->fl_bptr = &flptr->fl_buff[DBUFSIZ];
		retcode = flptr->fl_id;
	}
	restore(ps);
	return(retcode);
}
#endif

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