This appears to be an issue with Word2000 handling of empty attributes.
A reproduction case can be seen here:
```
$ cat test.html
<html xmlns:o="urn:schemas-microsoft-com:office:office">
<body>
<table>
<img class="" />
</table>
</body>
</html>
$ ./tidy --tidy-mark no --word-2000 yes test.html
line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 3 column 1 - Warning: <img> isn't allowed in <table> elements
line 2 column 1 - Info: <table> previously mentioned
line 1 column 57 - Warning: inserting missing 'title' element
line 3 column 1 - Warning: <img> lacks "alt" attribute
line 3 column 1 - Warning: <img> lacks "src" attribute
line 2 column 1 - Warning: trimming empty <table>
line 1 column 1 - Warning: <html> proprietary attribute "xmlns:o"
[2] 52405 segmentation fault ./tidy --tidy-mark no --word-2000 yes test.html
```
This was called from 6f2fb6e0e7/src/clean.c (L1710).
(It is technically undefined behaviour to call strncmp with `NULL` pointers however).
the remainder of the callbacks. TidyConfigCallback is now given a reference
to the instance of the TidyDoc that caused the callback to occur.
+ TidyConfigCallback
An earlier patch now passes back an all space text node. Previously this
would have been skipped. So add code in ParseList to detect, and discard
such a node.
Change committed:
modified: src/parser.c
Add option TidyStyleTags, --fix-style-tags, Bool, to turn off
this action.
Add warning messages MOVED_STYLE_TO_HEAD, and FOUND_STYLE_IN_BODY.
Fully iterate ALL nodes in the body, in search of style tags...
Changes to be committed:
modified: include/tidyenum.h
modified: src/clean.c
modified: src/config.c
modified: src/language_en.h
modified: src/message.c
parser and picklist system. Console application needs to be updated to fix
the description, as it shows autobool, and for some reason on the current
system I'm not getting assertion failures.
This PR refactors how picklists and option parsers are implemented in LibTidy,
making is vastly easier to implement new picklists in the future, as well as
modify some of the existing picklists such that they have more logical names.
Picklist arrays are now arrays of structures that include the possible strings
capable of setting a particular option value, and a new parser has been written
to work with these structures.
In addition, several of the existing parsers were removed, as they are now
redundant, and a couple of the remaining parsers were refactored to take
advantage of the new parser.
In effect, this means that:
- New parsers don't have to be written in the majority of cases where new
options are added that exceed yes/no/auto.
- Some of the existing options can have more meaningful names than yes/no/auto,
in a backward compatible way. For example, vertical-spacing "auto" currently
in no way reflects "auto" when used.