Add msinfo command, used for multisession CD generation with

mkisofs. Gives the last track start LBA, and the next writable LBA.

Inspired by: peter

2 files changed, 25 insertions, 7 deletions

diff --git a/usr.sbin/burncd/burncd.8 b/usr.sbin/burncd/burncd.8
index 0ed8cec..e5ba2c5 100644
--- a/usr.sbin/burncd/burncd.8
+++ b/usr.sbin/burncd/burncd.8
@@ -68,6 +68,12 @@ test write, dont actually wirte on the media.
 may be one of:
 .Pp
 .Bl -tag -width XXXXXXXXXXXX
+.It Ar msinfo
+Show the first LBA of the last track on the media 
+and the next writeable address on the media for use with
+.Xr mkisofs 1
+.Ar -msinfo
+switch when adding additional data to ISO filesystems with extra sessions.
 .It Ar blank
 Blank a CD-RW medium.
 This uses the fast blanking method, so data are not physically overwritten, only those areas that make the media appear blank for further usage.
diff --git a/usr.sbin/burncd/burncd.c b/usr.sbin/burncd/burncd.c
index ea36208..660e28b 100644
--- a/usr.sbin/burncd/burncd.c
+++ b/usr.sbin/burncd/burncd.c
@@ -101,13 +101,6 @@ main(int argc, char **argv)
 	err_set_exit(cleanup);
 
 	for (arg = 0; arg < argc; arg++) {
-		if (!strcmp(argv[arg], "blank")) {
-			if (!quiet)
-				fprintf(stderr, "blanking CD, please wait..\n");
-			if (ioctl(fd, CDRIOCBLANK) < 0)
-        			err(EX_IOERR, "ioctl(CDRIOCBLANK)");
-			continue;
-		}
 		if (!strcmp(argv[arg], "fixate")) {
 			if (!quiet)
 				fprintf(stderr, "fixating CD, please wait..\n");
@@ -115,6 +108,25 @@ main(int argc, char **argv)
         			err(EX_IOERR, "ioctl(CDRIOCCLOSEDISK)");
 			break;
 		}
+		if (!strcmp(argv[arg], "msinfo")) {
+		        struct ioc_read_toc_single_entry entry;
+
+			bzero(&entry, sizeof(struct ioc_read_toc_single_entry));
+			entry.address_format = CD_LBA_FORMAT;
+			if (ioctl(fd, CDIOREADTOCENTRY, &entry) < 0) 
+				err(EX_IOERR, "ioctl(CDIOREADTOCENTRY)");
+			if (ioctl(fd, CDRIOCNEXTWRITEABLEADDR, &addr) < 0) 
+				err(EX_IOERR, "ioctl(CDRIOCNEXTWRITEABLEADDR)");
+			fprintf(stderr, "%d, %d\n", entry.entry.addr.lba, addr);
+			break;
+		}
+		if (!strcmp(argv[arg], "blank")) {
+			if (!quiet)
+				fprintf(stderr, "blanking CD, please wait..\n");
+			if (ioctl(fd, CDRIOCBLANK) < 0)
+        			err(EX_IOERR, "ioctl(CDRIOCBLANK)");
+			continue;
+		}
 		if (!strcmp(argv[arg], "audio") || !strcmp(argv[arg], "raw")) {
 			track.test_write = test_write;
 			track.track_type = CDR_DB_RAW;