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READTOCENTRYS: make fake leadout entry

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This commit is contained in:
Andrey A. Chernov 1996-01-30 14:30:43 +00:00
parent 4a8d02835c
commit b7d2756067
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=13746
1 changed files with 26 additions and 3 deletions
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29
sys/scsi/cd.c
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@ -14,7 +14,7 @@
*
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
*
* $Id: cd.c,v 1.56 1996/01/05 20:12:39 wollman Exp $
* $Id: cd.c,v 1.57 1996/01/30 12:59:00 ache Exp $
*/
#include "opt_bounce.h"
@ -760,7 +760,7 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
struct ioc_read_toc_entry *te =
(struct ioc_read_toc_entry *) addr;
struct ioc_toc_header *th;
u_int32 len;
u_int32 len, readlen, idx;
u_int32 starting_track = te->starting_track;
if ( te->data_len < sizeof(struct cd_toc_entry)
@ -793,12 +793,35 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
error = EINVAL;
break;
}
/* calculate reading length without leadout entry */
readlen = ((int)th->ending_track - starting_track) + 1;
if (readlen < 1) /* read at least one entry */
readlen = 1;
readlen *= sizeof(struct cd_toc_entry);
if (readlen > len)
readlen = len;
error = cd_read_toc(unit, te->address_format,
starting_track,
(struct cd_toc_entry *)&data,
len + sizeof(struct ioc_toc_header));
readlen + sizeof(struct ioc_toc_header));
if (error)
break;
th->len = ((th->len & 0xff) << 8) + ((th->len >> 8) & 0xff);
/* make fake leadout entry if needed */
idx = starting_track + len / sizeof(struct cd_toc_entry) - 1;
if (idx == th->ending_track + 1) {
idx -= starting_track; /* now offset in the entries */
if (idx > 0) {
data.entries[idx].control = data.entries[idx-1].control;
data.entries[idx].addr_type = data.entries[idx-1].addr_type;
}
data.entries[idx].track = 170; /* magic */
data.entries[idx].addr.lba = th->len;
}
error = copyout(data.entries, te->data, len);
}
break;