diff options
| -rw-r--r-- | disk-utils/isosize.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/disk-utils/isosize.c b/disk-utils/isosize.c index 625dd427e..5f1a2971c 100644 --- a/disk-utils/isosize.c +++ b/disk-utils/isosize.c @@ -32,6 +32,14 @@ #define ISODCL(from, to) (to - from + 1) +static int is_iso(int fd) +{ + char label[8]; + if (pread(fd, &label, 8, 0x8000) == -1) + return 1; + return memcmp(&label, &"\1CD001\1", 8); +} + static int isonum_721(unsigned char *p) { return ((p[0] & 0xff) @@ -124,6 +132,8 @@ static void isosize(char *filenamep, int xflag, long divisor) if ((fd = open(filenamep, O_RDONLY)) < 0) err(EXIT_FAILURE, _("cannot open %s"), filenamep); + if (is_iso(fd)) + warnx(_("%s: might not be iso file system"), filenamep); if (lseek(fd, 16 << 11, 0) == (off_t) - 1) err(EXIT_FAILURE, _("seek error on %s"), filenamep); |