/*
* ckdrv - check the drive, see if it needs to be logged in.
*
* Arguments:
* d - has this drive been accessed, or had a media change
*
*
* returns:
* ERR if getbpb() failed
* ENSMEM if log() failed
* EINTRN if no room in dirtbl
* drive nbr if success.
*/
long ckdrv(int d)
{
int curdir;
LONG mask;
BPB *b;
KDEBUG(("ckdrv(%i)\n",d));
mask = 1L << d;
if (!(mask & drvsel))
{ /* drive has not been selected yet */
b = (BPB *) Getbpb(d);
if (!b)
return (mask&drvrem) ? EPTHNF : EDRIVE;
if ((long)b < 0)
return (long)b;
if (log_media(b,d))
return ENSMEM;
drvsel |= mask;
}
else if (mask & drvrem) /* handle removable media */
{
if (Mediach(d))
{
errdrv = d;
rwerr = E_CHNG; /* signal media change */
errcode = rwerr;
longjmp(errbuf,1);
}
}
/*
* ensure that current process has a valid default directory
* on this drive
*/
curdir = run->p_curdir[d];
if (curdir >= NCURDIR) /* validate */
curdir = 0; /* if invalid, say none */
if (!curdir /* no current dir for this drive */
|| !dirtbl[curdir].dnd) /* or current dir is invalid */
{
curdir = incr_curdir_usage(drvtbl[d]->m_dtl); /* add root DND */
if (curdir < 0)
return ENSMEM;
run->p_curdir[d] = curdir; /* link to process */
}
return d;
}
long ckdrv(int d)
{
int i;
LONG mask;
BPB *b;
#if DBGFSDRIVE
kprintf("ckdrv(%i)\n", d);
#endif
mask = 1L << d;
if (!(mask & drvsel))
{ /* drive has not been selected yet */
b = (BPB *) Getbpb(d);
if ( !(long)b ) /* M01.01.1007.01 */
return(ERR);
if ( (long)b < 0 ) /* M01.01.0915.02 */ /* M01.01.1007.01 */
return( (long)b );
if (log_media(b,d))
return (ENSMEM);
drvsel |= mask;
}
if ((!run->p_curdir[d]) || (!dirtbl[(int)(run->p_curdir[d])]))
{ /* need to allocate current dir on this drv */
for (i = 1; i < NCURDIR; i++) /* find unused slot */
if (!diruse[i])
break;
if (i == NCURDIR) /* no slot available */
return( EINTRN ) ; /* M01.01.20 */
diruse[i]++; /* mark as used */
dirtbl[i] = drvtbl[d]->m_dtl; /* link to DND */
run->p_curdir[d] = i; /* link to process */
}
return(d);
}
int Init_drive(int drive,drive_struct *str)
{
/* read BPB,FAT and init drive struct */
str->drive=drive;
if ((!(str->bpb=Getbpb(drive)))||(str->bpb->bflags&1))
/* cannot currently handle FAT16 */
{
return(FALSE);
}
if (!(str->fat=(char *) malloc(str->bpb->recsiz*str->bpb->fsiz)))
{
return(FALSE);
}
/* now read FAT */
if (Rwabs(0,str->fat,str->bpb->fsiz,str->bpb->fatrec-str->bpb->fsiz,
drive))
{
/* hmm error */
free(str->fat);
return(FALSE);
}
/* now alloc root dir */
if (!(str->root_dir=(char *) malloc(str->bpb->recsiz*str->bpb->rdlen)))
{
free(str->fat);
return(FALSE);
}
if (Rwabs(0,str->root_dir,str->bpb->rdlen,str->bpb->fatrec+str->bpb->fsiz,
drive))
{
/* hmm error */
free(str->root_dir);
free(str->fat);
return(FALSE);
}
return(TRUE);
}
