Hello all, let me report a strange behaviour with Cygwin Perl (I'm using cygwin1.dll 1.7.9-1, full installation 2 weeks ago).
File foo.h is an ordinary text file, all lines are terminated with DOS style line endings <cr> <lf> (hex: 0d 0a). It is located in a directory with textmode mounting in cygwin. One <cr> <lf> sequence of foo.h is split by a 4096 byte boundary within the file: "od -c -Ax foo.h" shows a <cr> (='\r') at byte offset 4095 (0xfff) and a <lf> (='\n') at offset 4096 (0x1000): ... 000ff0 / / / / / / \r \n / / X X X X X \r 001000 \n / / \r \n / / \r \n 001009 Now I issued the command "perl -pe 's/12345/54321/' foo.h >foomod.h" to produce foomod.h, located in the same directory as foo.h, thus with textmode mounting too. When I examined the result, I noticed that foomod.h was one byte bigger then foo.h. I expected identical size, and "od -c -Ax foomod.h" reports: ... 000ff0 / / / / / / \r \n / / X X X X X \r 001000 \r \n / / \r \n / / \r \n 00100a Ups! The original <cr> <lf> sequence starting at offset 4095 (0xfff) became a three character sequence <cr> <cr> <lf>! The <cr> is duplicated! In other files created by Perl with output redirection I observed this behaviour with every <cr> <lf> line ending, that is split by a 4096 byte boundary (even multiple times in one output file). Line endings not split by a 4096 byte boundary do not show this behaviour. The behaviour does not occur, when the destination file is located in a directory with binmode mounting. It does not occur either, when I use sed instead of Perl ("sed -e 's/12345/54321/' foo.h >foomod.h"), so I think the problem is specific to Cygwin Perl, not to Cygwin in general. I this a bug of the output buffering mechanism of Cygwin Perl? Or do I anything wrong? Any answer is highly appreciated. Thanks in advance. Best regards Sven -- Mit freundlichen Grüßen Dipl. Inform. Sven Severus Softwareentwicklung ---------------------------------------------------------- HIMA Paul Hildebrandt GmbH + CO KG Abt: Entwicklung Software Albert-Bassermann-Strasse 28 68782 Bruehl Germany Tel: +49 6202 709-289 Fax: +49 6202 709-299 E-Mail: s.seve...@hima.com Internet: www.hima.de -- HIMA Paul Hildebrandt GmbH + Co KG, Albert-Bassermann-Str. 28, 68782 Bruehl bei Mannheim Kommanditgesellschaft, Sitz Bruehl, Deutschland - Registergericht Mannheim HRA 421017 Ust-ID: DE 144286400, St.Nr: 43038 00190 Persoenlich haftende Gesellschafterin Paul Hildebrandt Verwaltungsgesellschaft mbH, Sitz Bruehl, Deutschland - Registergericht Mannheim HRB 420588 Geschaeftsfuehrer: Dipl.-Betriebswirt Steffen Philipp -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple