Re: [bug-gawk] mixed LF/CRLF scripts: incorrect line numbers

[Jannick]

Sorry, typo corrected below (see <<< EDIT).

On Tue, 8 May 2018 10:08:53 +0200, Jannick wrote:
> I just checked that the error report is just fine for pure LF or CRLF
versions of
> the file.
> 
> This makes me wonder how gawk processes EOLs, since I was expecting a bit
> of a mess with a pure LF file which (surprisingly) did NOT (!) happen. <<<
EDIT
> 
> To make this meaningful here gawk's signature I am working with and I
> forgot to mention yesterday:
> GNU Awk 4.2.1, API: 2.0 (GNU MPFR 4.0.1-p6, GNU MP 6.1.2)
> 
> Many thanks,
> J.
> 
> On Mon, 7 May 2018 17:15:02 +0200, Jannick wrote:
> > Hi All,
> >
> > I have come across something weird from the EOL hell on my Windows box
> > using Cygwin's gawk in -D mode (debug). Gawk did not show the correct
> > line numbers which caused confusion in break statements.
> >
> > Drilling things down I found out this is because the script file is of
> > mixed EOL type (LF and CRLF).  The culprit lines are those with LF
> > only (at least on my CRLF Windows machine using the cygwin's LF gawk
> version).
> >
> > In the syntax error report gawk tells us the line numbers of the
> > processed script it thinks they are OK and supposedly uses throughout
> > the program (syntax errors, debug etc.). So I used the attached file
> > with
> a small example.
> >
> > The sample file is CRLF with one single CR line causing the issue.
> > Running it produces
> >
> > gawk: ./gawk-line.awk:2:        line2 .= 2 # shown with correct line
> > gawk: ./gawk-line.awk:2:              ^ syntax error
> > gawk: ./line4 .= 4 # shown with line 3!= 3 # not shown, here the
> > comment-tag syntactically meant as EOL does not help
> > gawk: ./gawk-line.awk:3:              ^ syntax error
> > gawk: ./gawk-line.awk:4:        line5 .= 5 # shown with line 4!
> > gawk: ./gawk-line.awk:4:              ^ syntax error
> >
> > The problem starts in line 3. Before that gawk and I agreed so far.
> > - line 3 is ignored, the CR causes the overlay in the syntax error of
> > the next line, the comment tag does not stop gawk from parsing beyond
> > the CR, I think
> > - line 4 gawk thinks it is line 3, but we think it is line 4 ... and
> > so
> on.
> >
> > I included the syntax error report in the attached file.
> >
> > I think this is a bug, albeit it lives in the CR/CRLF realm where the
> > best solution would not be to point to a private compilation of gawk
> > on my Windows notebook to avoid cygwin's executable and CR confusion.
> >
> >
> > Please give me a shout if I you need any more information or I should
> > run any tests here on my machine.
> >
> > Best - and sorry for being a bit lengthy in this posting, J.