Bug#803342: Iiiittt's baaaack

[Dominique Brazziel <dbrazziel@snet.net>]

	Package ruby-bdb caused index++ to choke on 'README_en.html':

run-parts: executing /etc/cron.weekly/0anacron
run-parts: executing /etc/cron.weekly/dhelp
terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::erase: __pos (which is 4294967295) > this->size() (which is 0)
Dhelp::IndexerError: Broken pipe indexing /usr/share/doc/ruby-bdb/rdoc/README_en.html
, /usr/share/doc/ruby-bdb/rdoc/BDB.html
, /usr/share/doc/ruby-bdb/rdoc/Thread.html
, /usr/share/doc/ruby-bdb/rdoc/unknown.html
, /usr/share/doc/ruby-bdb/rdoc/table_of_contents.html
, /usr/share/doc/ruby-bdb/rdoc/index.html
, /usr/share/doc/ruby-bdb/rdoc/String.html
, /usr/share/doc/ruby-bdb/rdoc/RbConfig.html
, /usr/share/doc/ruby-bdb/rdoc/Object.html
, /usr/share/doc/ruby-bdb/rdoc/index.html

<* snip *>

I created another part ("14.part"), removed the README file from
it, and indexed it as follows:

cat 14.part | /usr/bin/index++ --config-file /usr/share/dhelp/config/swish++.conf --index-file ./14.index --follow-links -v4 -
BDB.html (269 words)
  index.html (165 words)
  Object.html (175 words)
  RbConfig.html (25 words)
  String.html (40 words)
  table_of_contents.html (1004 words)
  Thread.html (77 words)
  unknown.html (27 words)

index++: ranking index...
  "based" discarded (100%)
  "berkeley" discarded (100%)
  "classes" discarded (100%)
  "darkfish" discarded (100%)
  "generated" discarded (100%)
  "granger" discarded (100%)
  "home" discarded (100%)
  "interface" discarded (100%)
  "load" discarded (100%)
  "methods" discarded (100%)
  "michael" discarded (100%)
  "pages" discarded (100%)
  "rdoc" discarded (100%)
  "rdoc_rel_prefix" discarded (100%)
  "validate" discarded (100%)
index++: writing index...

index++: done:
  00:00 (min:sec) elapsed time
  8 files, 8 indexed
  2342 words, 1782 indexed, 596 unique

cat 14.part
/usr/share/doc/ruby-bdb/rdoc/BDB.html
/usr/share/doc/ruby-bdb/rdoc/index.html
/usr/share/doc/ruby-bdb/rdoc/Object.html
/usr/share/doc/ruby-bdb/rdoc/RbConfig.html
/usr/share/doc/ruby-bdb/rdoc/String.html
/usr/share/doc/ruby-bdb/rdoc/table_of_contents.html
/usr/share/doc/ruby-bdb/rdoc/Thread.html
/usr/share/doc/ruby-bdb/rdoc/unknown.html

	I looked at the README file and couldn't see any obvious reason
why the indexer wouldn't like it.  This bug is very difficult to find
the root cause.