flexfax: Re: Solution: /usr/local/lib/gcc-lib/sparc-sun-solaris2.7/2.95.../../../sparc-sun-solaris2.7/include/assert.h

[James Lee <jameswlee@lineone.net>]

Monday November 22 20:18:57 GMT 1999

Update to my previous message, 04/11/1999.
Re HylaFAX Problem:
make: *** No rule to make target
`/usr/local/lib/gcc-lib/sparc-sun-solaris2.7/2.95.../../../sparc-sun-solaris2.7/include/assert.h',
needed by `faxcover.o'.  Stop.



Sorry about this but I whistled out the previous solution quickly
before dashing off on holiday and further I'm no sed expert.  The first
version worked as far was needed and some, but now I would like to offer
some changes.

Thank you Nico Kadel-Garcia for your words.  I am happy if this is of
any use.  I trust that you (Nico) to be able to incorporated this
update in a release.



1.  There are a number of simplification changes.  These are really
only cosmetic/pedantic, the previous works, but as this will
(hopefully!) be copied many times I'll offer the changes.

2.  I have solved the choice of substitute char and the answer is
obvious.  UNIX does not offer any spare char, so don't use any!  Once
the multiple slashes are removed I can know that all ``//'' were
``/../''

3.  There were problems with reducing across spaces where two files
appeared on one line.  This is a legacy from the original.

4.  There were a number of other possible combinations which would
fail, eg ``./ABCD'' at start of line, `` ./ABCD/../WXYZ'' (note the
leading space), ``ABCD/../WXYZ''.


New Changes I Recommend
=======================

old line 252 and 253 in ``hylafax-v4.0pl2/port/mkdepend.in'':
	-e :loop -e 's:[^\./][^\./]*/\.\./::g' -e tloop \
	-e 's:\([/ ]\)\./:\1:g' \
new:
	-e s:///*:/:g -e 's:\(.*\): \1:' -e 's: \([^/^ ]\): ./\1:g' \
	-e :a -e 's:/\./:/:' -e 's:/\.\./://:' -e ta \
	-e :b -e 's:/[^/^ ][^/^ ]*//:/:' -e tb \
	-e :c -e s://:/../: -e tc \
	-e 's: \./: :g' -e 's:^ \(.*\):\1:' \


Get that? -- I'll expand and comment:

cat > sed.script << EOF
			# sed won't accept these comments!
s:///*:/:g		# remove multiple slashes
s:\(.*\): \1:		# add a leading space so all words begin with space
s: \([^/^ ]\): ./\1:g	# add "./" to all words except those with absolute path name

:a			# loop one
s:/\./:/:		# remove "/./"
s:/\.\./://:		# remove ".." from "/../"
ta			# until done, as in "/././" middle "/" is in 2 patterns

:b			# loop two
s:/[^/^ ][^/^ ]*//:/:	# match "/" + one or more not slashes or spaces + "//" and sub "/"
tb			# until done

:c			# third loop
s://:/../:		# replace any required ".."
tc			

s: \./: :g		# remove all leading "./"
s:^ \(.*\):\1:		# remove the leading space I added to mark first word start
EOF



There are a few file names that can be resolved, but will still fail my
sed, eg ``ABCD/..'' should be ``.'' and ``ABCD/../'' will disappear.
It's fixable, but does it have to be perfect?  To answer that I would
really need to know from where do these contorted file names come, but
this is a game, isn't it?

Have you every wondered why there are ``obfuscated C competitions'',
but none for sed?  Because any sed script is a winner; it needs no
further obfuscation!!!  [no please don't send me an entry form if you
know of one.]



James Lee.
jameswlee@lineone.net