Werner Lemberg wrote, quoting me:
>>> grops:<standard input>:594: lines in X exec command must not be
>>
>> [...] This isn't the cause of the overlong \X lines; the actual
>> cause is that the .pdfmark macro emits the entire pdfmark code for
>> each link in a single \X line, and that obscenely long URL exposes a
>> limitation of this design.
>
> Well, the limitation is hmm, old. It serves only to enforce a
> document structure which is fully compliant to the DSC. I doubt that
> there are still many printers which refuse PS files with lines longer
> than 255 characters...
>
> As a first measure I've replaced the errors in grops with warnings so
> that overlong lines actually get included into the output.
That helps, of course, but I think it would still be worth seeking an
implementation which satisfies the DSC limitation, and will therefore
not be dependent on this grops modification.
>> I guess the solution will be to adapt the .pdfmark implementation,
>> such that it distributes its output over multiple \X lines.
>
> Hopefully, you get something working. On the other hand, it no longer
> causes severe problems.
I've got a partial implementation working. It works with the existing
text of pdfmark.ms, but it isn't robust in its handling of parentheses,
as delimiters for quoted literals. It needs a bit more work to make it
completely satisfactory.
There is one small question I'd like to clarify: is the `ps:exec' tag
included in the count for the 255 character limit? In other words, in
the following patch fragment, must I leave the `.length' request as it
appears here, or can I safely remove the `ps:exec' from the string I'm
testing to set `pdfmark.length'?
Index: pdfmark.tmac
===================================================================
RCS file: /cvsroot/groff/groff/contrib/pdfmark/pdfmark.tmac,v
retrieving revision 1.5
diff -u -r1.5 pdfmark.tmac
--- pdfmark.tmac 26 May 2005 21:01:57 -0000 1.5
+++ pdfmark.tmac 15 Mar 2006 21:22:47 -0000
@@ -67,7 +67,71 @@
.\" operator; DO NOT include them in the instruction text!
.\" ----------------------------------------------------------------
.\"
-.if \\n[PDFOPMODE] \X'ps:exec [\\$* pdfmark'\c
+.if \\n[PDFOPMODE] \{\
+.\"
+.\" Strict DSC compliance forbids emission of ps:exec lines which
+.\" exceed 255 characters in length. We will push out the entire
+.\" "pdfmark" in one chunk, provided it fits within this limit.
+.\"
+. length pdfmark.length "ps:exec [\\$* pdfmark\"
+. ie (\\n[pdfmark.length] < 255) \X'ps:exec [\\$* pdfmark'\c
+. el \{\
+. \"
+. \" But, when the limit would be violated, then we must
+. \" recompose the specified "pdfmark", spreading it over as
+. \" many continuation lines as are necessary.
:
:
TIA,
Keith.
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