Add new information about how to unpack the bison source on

MSDOS and other systems which have 8.3 file name restrictions
using djunpack.bat and fnchange.lst.

djgpp/README.in

@@ -6,31 +6,31 @@ This is a port of GNU Bison @VERSION@ to MSDOS/DJGPP.
 
         The DJGPP port of Bison offers LFN and SFN support depending on which
         OS it is running. If LFN support is available or not is determinated at
-        run time. If LFN support is available (DOS session under Win9X), the
+        run time.  If LFN support is available (DOS session under Win9X), the
-        standard posix file name extensions will be used. These are: y.tab.c,
+        standard posix file name extensions will be used.  These are: y.tab.c,
-        y.tab.c++, y.tab.h, y.output, etc. If only SFN support is available
+        y.tab.c++, y.tab.h, y.output, etc.  If only SFN support is available
         (plain DOS), then the standard MSDOS short file names will be used.
         These are: y_tab.c, y_tab.h, y.out, etc.
         It should be noticed that this bison version needs the m4 program as
         back end to generate the parser file (y.tab.c etc.) from the skeleton
-        files. This implies that m4 must always be installed to get bison
+        files.  This implies that m4 must always be installed to get bison
-        working. m4 will use a couple of m4 scripts that will be installed in
+        working.  m4 will use a couple of m4 scripts that will be installed in
         /dev/env/DJDIR/share/bison and shall not be removed.
         It should also be noticed that the skeleton files bison.simple and
-        bison.hairy are no longer supported. This applies also to the environ-
+        bison.hairy are no longer supported.  This applies also to the environ-
         ment variables BISON_HAIRY and BISON_SIMPLE. Those variables are *no*
         longer honored at all.
         The kind of skeleton file bison.hairy is no longer supported at all.
         The skeleton file bison.simple is now called yacc.c and is an m4 script.
         The other two skeleton files supported by this bison version are glr.c
-        and lalr1.cc. The first one is a generalized LR C parser based on
+        and lalr1.cc.  The first one is a generalized LR C parser based on
         Bison's LALR(1) tables and the second one is a experimental C++ parser
         class.
         As has been told before, bison uses m4 to generate the parser file.
-        This is done by forking and using pipes for the IPC. MSDOS does not
+        This is done by forking and using pipes for the IPC.  MSDOS does not
         support this functionality so this has been reproduced in the usual
         way by redirecting stdin and stdout of bison and m4 to temporary files
-        and processing these files in sequence. All the changes to the sources
+        and processing these files in sequence.  All the changes to the sources
         are documented in the djgpp/diffs file.
 
         Please **read** the docs.
@@ -51,13 +51,56 @@ This is a port of GNU Bison @VERSION@ to MSDOS/DJGPP.
 3.:     Building the binaries from sources.
         ===================================
 
-3.1.:   To build the binaries you will need the following binary packages:
+3.1.:   Create a temporary directory and copy the source package into the
+        directory.  If you download the source distribution from one of the
+        DJGPP sites, just unzip it preserving the directory structure
+        running *ONE* of the following commands:
+          unzip32 bsn@PACKAGE_VERSION@s.zip      or
+          djtarx bsn@PACKAGE_VERSION@s.zip       or
+          pkunzip -d bsn@PACKAGE_VERSION@s.zip
+        and proceed to the paragraph 3.3, below.
+
+3.2.:   Source distributions downloaded from one of the GNU FTP sites need
+        some more work to unpack, if LFN support is not available.  If LFN is
+        available then you can extract the source files from the archive with
+        any unzip program and proceed to the paragraph 3.3, below.  Any file
+        name issue will be handled by the the DJGPP configuration files.
+        To unpack the source distribution on SFN systems, first, you MUST use
+        the `djunpack' batch file to unzip the package.  That is because some
+        file names in the official distributions need to be changed to avoid
+        problems on the various platforms supported by DJGPP.
+        `djunpack' invokes the `djtar' program (that is part of the basic DJGPP
+        development kit) to rename these files on the fly given a file with
+        name mappings; the distribution includes a file `djgpp/fnchange.lst'
+        with the necessary mappings.  So you need first to retrieve that batch
+        file, and then invoke it to unpack the distribution.  Here's how:
+
+          djtar -x -p -o bison-2.1/djgpp/djunpack.bat bison-2.1.tar.gz > djunpack.bat
+          djunpack bison-2.1.tar.gz
+
+        (The name of the distribution archive and the leading directory of the
+        path to `djunpack.bat' in the distribution will be different for
+        versions of Bison other than 2.1.)
+
+        If the argument to `djunpack.bat' include leading directories, it MUST
+        be given with the DOS-style backslashes; Unix-style forward slashes
+        will NOT work.
+
+        If the distribution comes as a .tar.bz2 archive, and your version of
+        `djtar' doesn't support bzip2 decompression, you need to unpack it as
+        follows:
+
+          bnzip2 bison-2.1.tar.bz2
+          djtar -x -p -o bison-2.1/djgpp/djunpack.bat bison-2.1.tar > djunpack.bat
+          djunpack bison-2.1.tar
+
+3.3.:   To build the binaries you will need the following binary packages:
           djdev203.zip (or a later but NOT a prior version)
           bsh204b.zip  (or a later but NOT a prior version)
           gcc400b.zip, gpp400b.zip, bnu215b.zip, mak3791b.zip,
           fil40b.zip, shl20jb.zip, txt20b.zip,
           txi48b.zip, grep24b.zip, sed414b.zip,
-          m4-143b.zip.
+          m4-144b.zip.
 
         If you want to run the check you will need also:
           dif281b.zip
@@ -65,21 +108,13 @@ This is a port of GNU Bison @VERSION@ to MSDOS/DJGPP.
         All this packages can be found in the v2gnu directory of any
         ftp.delorie.com mirror.
         You will need bsh203b.zip or later and *NOT* a prior version or
-        the build will fail. The same applies to djdev203.zip. Please note
+        the build will fail.  The same applies to djdev203.zip.  Please note
-        that Bison requires m4-143b.zip or later to work properly. All the
+        that Bison requires m4-144b.zip or later to work properly.  All the
         other packages are the ones I have used to build the binaries
-        from this source. Previuos versions of this packages may do the
+        from this source.  Previuos versions of this packages may do the
         job as well but I have not tested this.
 
-3.2.:   Create a temporary directory and copy the source package into the
+3.4.:   If for some reason you want to reconfigure the package cd into the top
-        directory. If you download the source distribution from one of the
-        DJGPP archives, just unzip it preserving the directory structure
-        running *ONE* of the following commands:
-          unzip32 bsn@PACKAGE_VERSION@s.zip      or
-          djtarx bsn@PACKAGE_VERSION@s.zip       or
-          pkunzip -d bsn@PACKAGE_VERSION@s.zip
-
-3.3.:   If for some reason you want to reconfigure the package cd into the top
         srcdir (bison-@TREE_VERSION@) and run the following commands:
           del djgpp\config.cache
           make clean
@@ -102,31 +137,30 @@ This is a port of GNU Bison @VERSION@ to MSDOS/DJGPP.
           cd \build
           x:\src\gnu\bison-@TREE_VERSION@\djgpp\config x:/src/gnu/bison-@TREE_VERSION@
 
-        The order of the options and the srcdir option does not matter. You
+        The order of the options and the srcdir option does not matter.  You
         *MUST* use forward slashes to specify the source directory.
 
         The batch file will set same environment variables, make MSDOS specific
         modifications to the Makefile.in's and supply all other needed options
         to the configure script.
 
-
+3.5.:   To compile the package run from the top srcdir the command:
-3.4.:   To compile the package run from the top srcdir the command:
           make
 
-3.5.:   Now you can run the tests if you like. From the top srcdir run the
+3.6.:   Now you can run the tests if you like.  From the top srcdir run the
         command:
           make check
 
         No test should fail.
-        Please note that the testsuite only works with LFN available. On plain
+        Please note that the testsuite only works with LFN available.  On plain
         DOS, most of the tests will fail due to invalid DOS names.
 
-3.6.:   To install the binaries, header, library, catalogs, and info docs
+3.7.:   To install the binaries, header, library, catalogs, and info docs
         run the following command from the top srcdir:
           make install
 
         This will install the products into your DJGPP installation tree given
-        by the default prefix "/dev/env/DJDIR". If you prefer to install them
+        by the default prefix "/dev/env/DJDIR".  If you prefer to install them
         into some other directory you will have to set prefix to the appropiate
         value:
           make install prefix=z:/some/other/place