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-
- ENV-handler and associated files are © 1991 by Mike Ruble. Any inquiries or
- problems should be sent EMAIL CompuServe ID 71310,1237.
-
-
- The Environment Variable handler is an AmigaDOS handler that manages all
- variables in memory instead of in separate files on disk. The way that
- Commodre implemented environment variables requires you to create a separate
- directory somewhere on your disk and create files with the name of your
- variables. I always thought that this was STUPID and a waste of disk
- space. So I (finally) wrote ENV-handler to store all variables in a single
- file that you can specify in its MountList entry. When you Mount ENV: the
- handler will read this file (if it exists) and set up its own variable list.
- Each time a variable is updated, added, renamed, or deleted the file will be
- updated so that variables will become permanent until you delete them.
-
- ENV: also supports sub-directories. You can create a sub-directory using
- the AmigaDOS MakeDir command. This was added to support the OS2.0 "sys"
- sub-directory. ENV: will support any number of nested sub-directories.
-
- I have also added support for temporary variables (which will not survive
- a system re-boot). By creating the variable with a prefix of 'temp/'
- (e.g. temp/TempVar) it will not be added to the file and will have to be
- re-created when you boot your system.
-
- To install ENV-handler in your system copy the file 'ENV-handler' to your
- L: directory and add the following to your 'DEVS:MountList' file
-
- ENV: Handler = L:ENV-handler
- Startup = "DEVS:envfile" /* put whatever filename you want here */
- Stacksize = 4000
- Priority = 5
- GlobVec = -1
- Mount = 1 /* OPTIONAL */
- #
-
- then somewhere in your 'S:Startup-Sequence' file put the command
- 'Mount ENV:' and your all set.
-
- ENV: will work much like the Commodore implementation of the 'ENV:'
- directory. You can use many of the DOS commands that you would use on
- files (Dir, List, Copy, Delete, Rename, etc) you can edit variables with
- your favourite editor (my editor works anyway) You can even CD to ENV:.
- One thing about Copying a file to a variable, you may get an error message
- telling you that the date and/or comment could not be changed, this is normal
- because date changes and comments are not supported (or neccesary).
-
- Variable names are not case sensitive (because of Commodore) so 'Var'
- will be the same as 'var' or 'VAR' etc.
-
- The file maintained by ENV: has a specific format. Be VERY carefull if
- you make any changes to it. The first 4 characters may look wierd because
- they indicate the length of the variable that follows (name=value). So an
- example of the file format is
- 00 00 00 0a name=value00 00 00 0c name2=value2
- | |
- 10 12
- if the length is incorrect the results could be disasterous. This file is
- updated any time a non-temporary variable is added, changed, deleted, etc.
-
- This is my first attempt at writing an AmigaDOS handler so don't erase
- your ENV directory until you are satisfied that ENV-handler performs
- properly. I have tried to break it in several ways and it seems quite
- stable to me. ENV: runs under V1.3 of AmigaDOS. I don't know about V1.2 or
- V2.0 (I don't have them) try it and let me know please.
-
- Enjoy
- Mike Ruble
- CompuServe ID 71310,1237
-
-
- CHANGES:
-
- V2.5 05/21/91 - MWR - Added support for sub-directories. cleaned up some
- code to make a little faster.
- V2.0 05/04/91 - MWR - Re-coded in assembler to reduce size and
- increase speed. fixed a bug found when creating
- or writing to variables.
- V1.3 05/02/91 - MWR - Removed ' (temp)' tag on temporary variables.
- I decided it wasn't necessary.
- V1.1 04/23/91 - MWR - Added support for temp variables. Stomped on
- bug found when using type.
- V1.0 04/21/91 - MWR - New program.
-