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README.Amiga
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2001-02-25
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GNU Diff, Diff3, SDiff and Cmp Version 2.1
------------------------------------------
Amiga Port by Carsten Steger
----------------------------
Hi everyone!
In this directory you will find the complete source code of GNU Diff.
All the modifications I had to make to get it to compile and run with
SAS/C 6.2 are bracketed by '#ifdef AMIGA' constructions. I also have
included a diff file (generated by diff 2.1, of course :-) ) that
contains the context diffs to the original distribution.
Diff should run under any OS version with one exception: If you use
the '-l' resp. '--paginate' flag you have to have OS 2.0 or higher.
This is due to the fact that I had to use the 'System' call to run pr.
For those of you that don't have pr: it is obtainable by ftp at
amiga.physik.unizh.ch. Download the file amiga-textutils-1.3.lha that
comes with David Gay's brilliant port of GNU Emacs.
There's a couple of minor differences to diff under UN*X: The current
directory is referred to by "". So if you want to diff a directory
<dir> against the current directory, type 'diff <dir> ""'. If you
want to change the line- and line-group-format, here's how it's done
on the Amiga (see also the sections 'Line Formats', 'Line Group
Formats', and 'Detailed If-then-else' in the manual):
On UN*X you would type:
diff \
--old-line-format='-%l
' \
--new-line-format='|%l
' \
--unchanged-line-format=' %l
' \
old new
On the Amiga you have to type this as (type <RETURN> after each '+'):
diff "--old-line-format=-%l+
" "--new-line-format=|%l+
" "--unchanged-line-format= %l+
" old new
Summing up: if you want to insert a newline into an argument, type '+'
followed by <RETURN>. This seems to be the only way to do this with
the Commodore shell.
NB: The files in the '-x' resp. '--exclude' option are specified with
UN*X wildcards (as stated in the maunual): Use '*.o' to get '#?.o'!
(This is because the exclusion is done internally using the GNU regexp
library.)
Diff3 only runs under OS 2.0 or higher. This is because I had to use
the 'System' call to run the two child processes that diff3 spawns.
Sdiff, too, only runs under OS 2.0 or higher for the same reason as
above. Please note that if you break the program with C-c or by typing
the 'q' command within sdiff, it might take some time to clear the
pending pipe in- and output. Otherwise the program should run exactly
as described in the maual. The default editor that sdiff uses is
MEmacs from the good old Workbench. You should have it somewhere in
your path. Otherwise you have to set the EDITOR environment variable:
setenv EDITOR <your favourite editor>.
Cmp runs under any OS version.
To install the programs you just copy them to a directory in your
path: copy c/#? <directory>
The documentation is included in the diff.texi file. Because not
everybody has the texinfo package, I also have included a TeX-ed
version of the manual. You can print diff.dvi (with a TeX printer
driver) to get a hardcopy of the manual. For those of you that don't
have TeX: An excellent port of TeX for the Amiga by Georg Hessman
(PasTeX) is obtainable by ftp at ftp.uni-passau.de.
If you have the infamous Am*gaGuide, I highly recommend that you use
MakeInfo by Sebastiano Vigna and Reinhard Spisser (on Fish disk 787 or
by ftp at amiga.physik.unizh.ch) and convert diff.texi into the
Am*gaGuide format for online documentation.
If you use GNU Emacs on the Amiga you might want to install the
#?.info#? files in GNUEMACS:info too. You will have to make an
appropriate entry in the dir file in this case.
If you have any problems that you think are specific to the Amiga
version of diff, e.g. you get a different result on the Amiga than the
result you get on a UN*X machine, you should report them to me. My
E-mail address is:
carsten.steger@informatik.tu-muenchen.de
If you think you have found any other bugs, you should report them to
the GNU project. Their address is:
bug-gnu-utils@prep.ai.mit.edu
Have fun!
Carsten