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FIXDIR.DOC
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1979-12-31
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DOCUMENTATION FOR FIXDIR.COM
Introduction
------------
FIXDIR is program to allow renaming or erasing of illegal
filenames from CP/M directories.
Usage
-----
FIXDIR [d:]
Where
[d:] is an optional drive identifier or ?
Examples
--------
FIXDIR
This will check the directory of the currently logged
drive.
FIXDIR B:
This will check the directory of drive B:.
FIXDIR ?
This will display a short "usage" message and return
to CP/M without doing any directory checking.
Error Messages
--------------
If more than one argument is given on the command line, the
command line error is displayed and the "usage" message is dis
played.
A>FIXDIR A: B:
FIXDIR version 0.95 (Preliminary evaluation release)
(C) 1981, Software Tools - Sydney, Australia.
Corrects illegal file names in a CP/M disk directory.
Command line error : B:
USAGE :
FIXDIR
FIXDIR B:
Exiting to CP/M
Internal Prompts
----------------
If an illegal filename is located in the directory the user
is prompted to erase or rename the file. If rename is chosen a
new filename is prompted. The entered filename is also checked
for legality:-
Illegal CP/M file name : bad .fil
Press 'E' to erase file:
Or
Press 'R' to rename file :
Enter new file name : goo,d.one
BAD FILENAME entered as new name !
Enter new file name :good.one
RENAMING bad .fil to GOOD .ONE
Performing another pass.
No illegal file names in directory on this pass.
There were 2 passes performed.
Tutorial on FIXDIR
------------------
There are certain characters which are illegal in CP/M
filenames as far as a CP/M disk directory is concerned. These
are:
<>.,;:=?*[] and all lower case alphabetical characters
Note that some of the characters are legal in CP/M file
specifiers which may be given to utility programs or used in BDOS
calls but the should NEVER appear in a directory display.
Also note that the Digital Research documentation specified
the comma "," as illegal but that the CCP will accept filenames
with embedded commas. FIXDIR follows the printed specification
and considers commas illegal in directory enteries.
In general the CCP (console command processor) will not
accept illegal file names so it is not possible to put them into
to the directory with the "SAVE" command. There is no protection
built into the BDOS to stop illegal filenames being created in
the disk directory as a result of BDOS file create or rename
commands. The most common way that illegal filenames get into the
disk directory is as a result of a save operation from Microsoft
BASIC. If the filename is typed in lower case characters from
within Microsoft BASIC it will be saved that way in the
directory. The next most common way is as a result of a high
level language program going wild and creating spurious files.
Directory enteries which contain illegal file names cannot
be erased with ERA command as they will never be matched by the
CCP (Except if you specify *.*). The CCP converts all command
lines to UPPER CASE before processing them, so even if you
specify a lower case file name it will be upper case by the time
the BDOS tries to match the filename with a directory entry.
FIXDIR is written in the "C" language and directly examins
directory enteries without relying on the BDOS individual file
name matching function. The illegal name finding function is
renterent and is called repeatedly until no more illegal file
names can be located. The total number of passes through the
renterent function is reported at the end of the program if any
illegal file names were found.
END OF FIXDIR.DOC