101 lines
4.7 KiB
Text
101 lines
4.7 KiB
Text
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Notes on the THINK C version of Flex 2.4.6
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Scott Hofmann 23-JUL-94
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Internet: scotth@visix.com
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The only changes needed to compile Flex 2.4.6 under Symantec C++ 6.0 was
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to #include <console.h> in main.c and call ccommand() just before flexinit()
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in main(). The notes below are mostly of historical significance only; most
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of the workarounds below were to get around restrictions/problems in earlier
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versions of THINK C. The only section which still applies is Russell Finn's
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description of how to make Flex generate output of type 'KAHL'. Also, 4-byte
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ints must be used by any project which uses Flex output.
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If you want to recreate the project, you'll need to add the files
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alloca.c and xmalloc.c in this directory. Both files are copylefted; see
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the GNU General Public License for details. You will also need to recompile
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both the ANSI and unix libraries to use 4 byte ints, and if you want the
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files that flex creates to have 'KAHL' as the creator you'll need to apply
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Russell Finn's patch.
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Notes on the THINK C version of Flex 2.3.7
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Jonas Barklund, 25-JAN-92
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Internet: jonas@csd.uu.se
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I have merged the sources for Flex version 2.3.7 with the older version
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which was hacked for THINK C version 4. I have conditionalized the code
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so that I think it should work with both THINK C version 4 and 5 (for
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those of you who don't know: the THINK_C symbol is defined as 1 in version
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4 and as 5 in version 5). I have put in some missing prototypes, so it
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compiles also with "require prototypes" on.
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Most of the notes below still apply, in particular that about the MakeRes
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program.
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Notes on the THINK C version of Flex
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Russell S. Finn, 19-FEB-90
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Internet: rsfinn@athena.mit.edu, rsfinn@neutron.lcs.mit.edu
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CompuServe: 76377,1107
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GEnie: RSFINN
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Flex appears to be covered by a copyright notice from the University of
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California, similar to the one covering Berkeley Unix; the Free Software
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Foundation is not part of the picture here. So here is a version
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created with THINK C 4.0, along with the source code; as with the
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Bison distribution, I am including *all* of the source code I received
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with the package.
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The current version (modification date January 25, 1990) has only the
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bare-bones interface provided by the THINK C library routine "ccommand",
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which allows the user to type a command line and to redirect the output.
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Perhaps someday I may try to implement a "real" user interface; perhaps
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not.
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The only modifications made to the source file are surrounded by "#ifdef
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THINK_C"..."#endif"; in theory, then, these sources could be recompiled
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on another system if necessary. These are the actual files modified:
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alloca.c, dfa.c, flexdef.h, main.c, misc.c, scan.c, sym.c. Most of these
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changes were minor, and many of them would have been unnecessary if the
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original Flex source code had been written for an ANSI-compliant C compiler.
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In addition, the file "macutils.c" is completely new; see the discussion
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of "MakeRes" below.
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THINK C users may find it convenient to have the output text files written
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by Flex be THINK C documents. To do this, create a copy of the "ANSI"
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project called "ANSI-KAHL", and a copy of the file "fopen.c" called
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"fopen-KAHL.c". In the copy, find the routine "setfiletype", and replace
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the lines:
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if (!(oflag & F_BINARY))
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pb.ioFlFndrInfo.fdType = 'TEXT';
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with the lines:
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if (!(oflag & F_BINARY)) {
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pb.ioFlFndrInfo.fdType = 'TEXT';
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pb.ioFlFndrInfo.fdCreator = 'KAHL';
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}
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Replace "fopen.c" with the new "fopen-KAHL.c", rebuild the new project
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"ANSI-KAHL", and use this project in the project file "Flex.<2E>"
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instead of the "ANSI" project.
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** The "MakeRes" program
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The output files created by Flex contain large amounts of preinitialized
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static data; the file "scan.c" contained in the Flex.<2E> project is one
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such file. However, the Macintosh architecture limits normal applications
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to 32K of global data. In many cases (including Flex), this limit can
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be surpassed by the static data generated by Flex.
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The solution I have implemented for the THINK C version of Flex is to
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extract the data tables from the Flex output file, and paste them into
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the file "MakeRes.c". Then, by recompiling and running the program in
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the "MakeRes.<2E>" project (it is not necessary to create an application),
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a resource file called "Flex.<2E>.rsrc" is created in the current directory.
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The Flex output file "scan.c" has been modified to load the static data
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from the resource fork of the Flex application. This is done by calling
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the "load_table" function, which is defined in the file "macutils.c".
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In the application for which I needed Flex, the data tables were small
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enough that I didn't need to do this. However, if your application
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requires you to do this, simply follow the model of "scan.c"; the MakeRes
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project and source code has been included for your use.
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