Date: Wed, 28 Jan 2009 02:09:50 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: hackers@freebsd.org Subject: Code review request: cdcontrol status label additon Message-ID: <20090128.020950.-1962670362.imp@bsdimp.com>
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Please find enclosed patches to enable printing of the ISO-9660 Volume
label, if present, for a CD. I've connected this to the 'status
label' command. Please comment.
Warner
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Index: cdcontrol.1
===================================================================
--- cdcontrol.1 (revision 187760)
+++ cdcontrol.1 (working copy)
@@ -156,12 +156,14 @@
Play the right subtrack on both left and right channels.
.It Ic info
Print the table of contents.
-.It Ic status Op Cm audio | media | volume
+.It Ic status Op Cm audio | label | media | volume
Print the information about the disc:
.Pp
.Bl -tag -width ".Cm volume" -compact
.It Cm audio
the current playing status and position
+.It Cm label
+the current ISO 9660 volume label, if present
.It Cm media
the current media catalog status
.It Cm volume
Index: cdcontrol.c
===================================================================
--- cdcontrol.c (revision 187760)
+++ cdcontrol.c (working copy)
@@ -86,6 +86,7 @@
#define STATUS_AUDIO 0x1
#define STATUS_MEDIA 0x2
#define STATUS_VOLUME 0x4
+#define STATUS_LABEL 0x8
struct cmdtab {
int command;
@@ -801,6 +802,8 @@
what |= STATUS_MEDIA;
else if (!strncasecmp(p, "volume", strlen(p)))
what |= STATUS_VOLUME;
+ else if (!strncasecmp(p, "label", strlen(p)))
+ what |= STATUS_LABEL;
else {
warnx("invalid command arguments");
return 0;
@@ -851,6 +854,32 @@
else
printf ("No volume level info available\n");
}
+ if (what & STATUS_LABEL) {
+#define ISO9660_MAGIC "\x01" "CD001" "\x01\x00"
+#define ISO9660_OFFSET 0x8000
+#define VOLUME_LEN 32
+#define CD_SECTOR_LEN 2048
+#define LABEL_NAME_OFF 0x28
+#define LABEL_NAME_LEN 32
+ char *sp, *ep, buffer[CD_SECTOR_LEN];
+
+ lseek(fd, ISO9660_OFFSET, SEEK_SET);
+ rc = read (fd, buffer, CD_SECTOR_LEN);
+ if (rc == CD_SECTOR_LEN &&
+ memcmp(buffer, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) == 0) {
+ sp = buffer + LABEL_NAME_OFF;
+ ep = sp + LABEL_NAME_LEN - 1;
+ while (*ep == ' ' && ep >= sp)
+ *ep-- = '\0';
+ if (verbose)
+ printf("ISO 9660 Label is: %s\n", sp);
+ else
+ printf("%s\n", sp);
+ }
+ else
+ printf("No ISO 9660 label found\n");
+ }
+
return(0);
}
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