Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!nstn.ns.ca!news.cs.indiana.edu!spool2.mu.edu!uwm.edu!bionet!agate!ucbvax!ulysses!ulysses.att.com!gsf
From: gsf@ulysses.att.com (Glenn S. Fowler)
Newsgroups: comp.sys.mips
Subject: regular-file/. bug
Keywords: pathname resolution
Message-ID: <14170@ulysses.att.com>
Date: 10 Jan 91 17:36:24 GMT
Sender: netnews@ulysses.att.com
Distribution: comp.sys.mips
Organization: AT&T Bell Labs
Lines: 20

on RISC/os rel. 4.51 I noticed the following pathname resolution bug
the bug makes "regular-file" equivalent to "regular-file/."
this bug does not appear in an earlier release 4.20
I don't have access to releases in between

$ df .
Filesystem                 Type  kbytes     use   avail %use  Mounted on
/dev/dsk/ipc0d0s6           ffs  563983  562818    1165 100%  /usr
$ cat > foo
$ ls -li foo
 30983 -rw-r--r--   1 asr      bdev           0 Jan 10 10:37 foo
$ ls -li foo/.
 30983 -rw-r--r--   1 asr      bdev           0 Jan 10 10:37 foo/.

the trailing /. is ignored by pathname resolution

the bug showed up in directory tree traversal code that tests if a known,
readable directory is searchable
Glenn Fowler    (201)-582-2195    AT&T Bell Laboratories, Murray Hill, NJ
uucp: {att,ucbvax}!ulysses!gsf              internet: gsf@ulysses.att.com