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-
- Public Domain Responsibilities
- By Richard Greenlaw
- From Dr. Dobb's Journal, Number 81, July 1983, Page 10
-
- To DDJ Readers and CP/M Users,
-
- Over the years that DDJ has been serving us, I have
- contributed on article (a disassembler in issue no. 27), a review
- of the PC-1 pocket computer (in issue no. 52) and a few letters.
- However, this contribution is a bit different. The bottom line
- of this letter is a warning!
-
- I am the author of a set of programs which is in
- widespread public domain distribution (at least three
- continents). They are called SQ.COM, USQ.COM and FLS.COM. They
- run on CP/M systems and serve to squeeze files to smaller sizes
- in preparation for transmission via modem or distribution
- diskette.
-
- The latest version of these programs are 1.5, 1.5 and 1.1
- respectively. I released these programs to the public domain,
- except for financial gain, and included full source code (in C
- language) and extensive documentation. This software is now
- available via the C Users group, which has advertized in DDJ.
-
- Having had reasonable experiences with previous public
- offerings, I gave my name and address in the documentation and
- in the sign-on message of each program. Therein lies the story!
-
- In recent months I have had a couple of dozen phone calls
- claiming that these programs have destroyed various innocent
- files. But when I ask for details, I find that the programs in
- question have version numbers higher than any I have ever issued!
- Not only that, but many different version numbers, as high as
- 1.9, have been mentioned!
-
- I expect that whoever produced each version of these
- programs was as innocent as I was in August of 1981 when I ussued
- the above-mentioned programs. But the fact remains that one or
- more persons has taken it upon themselves to propagate modified
- versions of my software without taking the responsibility of
- adding their name and address to the documentation and sign-on
- messages.
-
- It is an unfortunate fact that C and probably other high-
- level languages can crash impolitely when the CP/M TPA is too
- small for the program and its data space, including dynamically
- allocated local variables. (These programs do use recursive
- algorithems).
-
- I have heard, without confirmation, that vast amounts of
- code have been added to some versions of these programs to add
- wild card file name processing. Perhaps this is the problem. I
- provided that feature as a separate program, FLS.COM, precisely
- for that reason. It is also possible that full and careful use
- of the recompilation options available in BDS-C has been abused,
- resulting in too much code or improperly linked code. Or maybe
- there have simply been some accidents in copying or modem
- transmission.
-
- Whatever the case, I recommend that if you modify
- software which you have not written, then try to consult with the
- original author before publicly distributing such software. If
- that is not possible, at least accept the responsibility of being
- the first line of complaint handling by adding (not replacing)
- your name to the documentation and sign-on message.
-
- If anyone has a file which the above-mentioned versions
- of my programs cannot squeeze and then reproduce, please contact
- me. My computers can read and write the following diskette
- formats: Micropolis Mod II, Max-80 5" 40 track/side (SS/DS,
- SD/DD) formats, Osborne Single Density, Omikron 5" single
- density, Xerox 5" single density. Except for the Micropolis, all
- of the above are handled by my Lobo Max-80 computer.
-
- Do you really want more public domain source code
- sofrware? If so, and if you know the source of these
- modifications, please help stamp out the bad versions (copies?)
- of this software. Unfortunately, I don't know exactly which
- versions are bad because not one single person has ever sent me a
- courtesy copy of any modifications!
-
- To those bewildered innocent victims, the unsqueezing
- precess contains a validity check based on the original file. If
- you can produce a file (not just a console display) by running
- the USQ.COM program, then the resulting file should be an exact
- replica of the original.
-
- I also ask purchasers of communications packages who I
- have authorized to distribute this software not to assume that I
- am responsible for the communications packages. It seems that
- reproduction of my documentation files makes my name and address
- more prominent than those of the commercial distributers!
-
- Sincerely,
- Richard Greenlaw
- 251 Colony Ct.
- Gahanna, Ohio 43230
-
-