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Message-ID:	<03F4742D8225D21191EF00805FE62B9908E23F03@aa-msg-01.medstat.com>
From:	John Wiersba <John DOT Wiersba AT medstat DOT com>
To:	"'rcs-bugs AT cs DOT purdue DOT edu'" <rcs-bugs AT cs DOT purdue DOT edu>
Cc:	"'cygwin'" <cygwin AT sourceware DOT cygnus DOT com>,
	"'michael AT weiser DOT saale-net DOT de'" <michael AT weiser DOT saale-net DOT de>,
	"'Andrew Markebo'" <flognat AT flognat DOT myip DOT org>,
	"'Gary'"
	<gfilipski AT satx DOT rr DOT com>,
	John Wiersba <John DOT Wiersba AT medstat DOT com>
Subject:	bug in rcs 5.7
Date:	Wed, 4 Jul 2001 00:32:02 -0400
MIME-Version:	1.0
X-Mailer:	Internet Mail Service (5.5.2650.21)
X-OriginalArrivalTime:	04 Jul 2001 04:31:17.0329 (UTC) FILETIME=[2AAB0C10:01C10442]

Hi!  I believe I've found in bug in rcs 5.7 running under the latest cygwin.
The fix is to src/ci.c on line 725.
   old:        if (lseek(wfd, wfd_off, SEEK_CUR) == -1)
   new:        if (lseek(wfd, wfd_off, SEEK_SET) == -1)

Thanks to Gary L. Filipski, gfilipski AT satx DOT rr DOT com for a good description of
how to create a reproducible test case.

I built my rcs from clean sources modified as specified in the cygwin
documentation:
After ./configure:
  - in src/conf.sh line 1039 change has_mmap=1 to has_mmap=0
  - in src/Makefile change line 90 to look like x = .exe
Then, make; make install

The bug can be reproduced with the following script running under the latest
cygwin:

#!/bin/bash
rm -f asdf asdf,v
cat <<EOF >asdf
01 fffffffffffffffffffffffffffffffffffffff end
02 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
03 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
04 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
05 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
06 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
07 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
08 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
09 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
10 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
11 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
12 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
13 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
14 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
15 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
16 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
17 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
18 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
19 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
20 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
21 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
22 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
23 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
24 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
25 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
26 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
27 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
28 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
29 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
30 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
31 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
32 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
33 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
34 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
35 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
36 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
37 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
EOF
ci -t- asdf >/dev/null 2>&1
co -l  asdf >/dev/null 2>&1
tail +2 asdf >fdsa
cp -f fdsa asdf
rm -f fdsa
ci -mx -u asdf
ls -l
# END OF SCRIPT


which gives the following output:

asdf,v  <--  asdf
new revision: 1.2; previous revision: 1.1
done
total 8
-rwxr-xr-x    1 jrw      JRW          2883 Jul  4 00:28 RCS_BUG
-r--r--r--    1 jrw      JRW          2412 Jul  4 00:28 asdf
-r--r--r--    1 jrw      JRW          1349 Jul  4 00:28 asdf,v    <=
truncated size!


The bug is that asdf,v has a bad copy of the second revision, truncated
after 1024 bytes:

...
1.2
log
@x
@
text
@02 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
03 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
04 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
05 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
06 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
07 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
08 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
09 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
10 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
11 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
12 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
13 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
14 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
15 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
16 fasfasdffffffffffffffffffffffffffffffffffffffffffffffffffff end
17 fasfasdfffffffff@                                               <=
truncated here
...


-- John Wiersba

P.S. Thanks for your free (GNU) rcs!!!!


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