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-
- CLIPPER LITE
- DOCUMENTATION
-
- (Clipper is a trademark of Nantucket Corporation)
-
-
- WHAT IS IT?
-
- CLIPPER LITE is a group of .OBJ files intended to help reduce the size of .EXE
- files, in Clipper programs which do not use all of the features/commands of
- Clipper in a single program. It is based on work done by Jerry Gilmore. I am
- deeply grateful to him- many people have tried to put the bite on me, but he
- is the first one ever to take the byte away.
-
- These files are offered for educational & experimental purposes only. They
- work for me, but may not be reliable in your programs. You will have to test
- the usefulness of these files yourself. No warranty is made of fitness.
-
-
- HOW DOES IT WORK?
-
- These object files are linked into your program (at link time), and replace
- chunks of related routines in CLIPPER.LIB with dummy routines, thus reducing
- the size of your .EXE file. Each .OBJ file is named for what it replaces:
- e.g. NOMACRO replaces macro handling routines. If you link in an .OBJ file
- which replaces something you need in a particular program, your program will
- either work strangely or crash, so test every part of your program.
-
- Example (Using Tlink 1.0)
- TLINK Myprog nomacro nonet nomemo,,,clipper.lib
-
- If you link in all of these .OBJ files, you will save about 75K to 80K bytes.
- You may at first think that a Clipper Program couldn't be very useful without
- database and index capabilities, for instance, but after some thought, you
- may see uses for it. An installation program, for instance, may use menus,
- GETs, file copying, etc. but not need to do any actual DBF handling. This
- method may make the installation program small enough to fit on a disk with
- your application, saving a second (or third) distribution disk. I have
- written a complete Un-arcing shell in Clipper that handles ZIP, ARC, PAK,
- ZOO, and LZH (Lharc) files. Linking in most of these .OBJ files allowed me
- to reduce the .EXE from 175K to 96K... adding 79K of usable RAM space!
-
-
- More info is in the Denver Clipper Users Group Newsletter of June 1989, and
- in the file SHRINKCL.ARC by Jerry Gilmore.
-
-
- Filename Savings Purpose
- -------------------------------------------------------------------------------
- NODBF 24K Database file handling, locate, etc.
- NOINDEX 13K Index file handling, seek, index on, etc.
- NOMATH 13K Floating point math, ASC(), related routines
- NOMACRO 11K Macro expansion, conversion, related routines
- NONET 240 bytes Network functions
- NOMEMO 1K Memo & DBT functions
- NOREEF 5K Somebody please tell me what this does!
- NOSORT 5K Database sorting, probably ASORT()
-
-
- These files do not comprise the ultimate reduction in EXE possible. There are
- more things waiting to be discovered in the library that are not used with some
- commands. For instance, you can modify ERRORSYS.PRG to contain only one-line
- dummy routines that return .T. or .F. without any messages or error handling.
- Sort of a user-hostile interface, but in a utility program that you only use
- yourself, you could get by with it.
-
- I am interested in hearing from anybody who has done any related work on
- Clipper internals. If you have anything to add to this, let me know! I also
- would like to know if anybody knows how to invoke the Clipper internals to
- allow me to stop the program at a line or single-step it without using Debug.
-
- Malcolm MacLeod
- 303-693-7925
-
-