|
e7b6ca15
|
2023-09-18T13:25:06
|
|
globals: Rework global state destruction on Windows
If DllMain is used, rely on it working as expected. The old code seemed
to attempt to free global state of other threads if, for some reason,
the DllMain mechanism didn't work.
In a static build, register a destructor with
RegisterWaitForSingleObject.
Make public functions xmlGetGlobalState and xmlInitializeGlobalState
no-ops.
Move initialization and registration of global state objects to
xmlInitGlobalState. Lookup global state with xmlGetThreadLocalStorage
which can be inlined nicely.
Also cleanup global state when using TLS. xmlLastError must be reset.
|
|
|
39a275a5
|
2023-09-18T21:25:35
|
|
globals: Define globals using macros
Declare and define globals and helper functions by (ab)using the
preprocessor.
|
|
|
bf6bd161
|
2023-09-18T19:53:31
|
|
globals: Introduce xmlCheckThreadLocalStorage
Checks whether (emulated) thread-local storage could be allocated.
|
|
|
89f49767
|
2023-09-18T18:44:32
|
|
globals: Make xmlGlobalState private
This removes a public struct but it seems impossible to use its members
in a sensible way from external code.
|
|
|
a07ec7c1
|
2023-09-18T17:39:13
|
|
threads: Move library initialization code to threads.c
This allows to consolidate the initialization code since the global init
lock was already implemented in threads.c.
|
|
|
4e1c13eb
|
2023-09-18T14:45:10
|
|
debug: Remove debugging code
This is barely useful these days and only clutters the code base.
|
|
|
c19771c1
|
2023-09-18T00:54:39
|
|
globals: Move code from threads.c to globals.c
Move all code that handles globals to the place where it belongs.
|
|
|
2a4b8114
|
2023-09-17T23:16:49
|
|
globals: Rename members of xmlGlobalState
This is a deliberate first step to remove some internals from the
public API and to avoid issues when redefining tokens.
|
|
|
d7cfe356
|
2023-09-14T20:52:24
|
|
parser: Avoid undefined behavior in xmlParseStartTag2
Instead of using arithmetic on dangling pointers, store ptrdiff_t values
in void pointers which is at least implementation-defined.
|
|
|
90d5b799
|
2023-09-14T15:30:38
|
|
schemas: Fix memory leak of annotations in notations
Found by OSS-Fuzz.
|
|
99cba4b3
|
2023-09-09T17:46:34
|
|
Handle NOCONFIG case when setting locations from CMake target properties
|
|
|
4aa08c80
|
2023-09-08T14:52:22
|
|
xinclude: Fix 'last' pointer in xmlXIncludeCopyNode
Also set the 'last' pointer for the root node.
Fixes https://gitlab.gnome.org/GNOME/libxslt/-/issues/93
|
|
f369154f
|
2023-09-03T22:14:01
|
|
cmake: Generate better pkg-config file for SYSROOT builds under CMake
I recently fixed this for Autotools but said that fixing this for CMake
was not feasible due to it using `find_package` rather than
`pkg_check_modules`. I then thought about it and couldn't find any
reason why CMake couldn't try `pkg_check_modules` first and then fall
back to `find_package`, as that's basically what Autotools does.
I had wanted to use the linker flags generated by CMake when it does
fall back to `find_package`, but it only returns direct paths to the
libraries, as opposed to `-l` flags. Baking these library paths into the
pkg-config and xml2-config files would break static linking and
cross-compiling, so I've stuck with the `-l` flags we already have.
There is no need to set `CMAKE_REQUIRED_LIBRARIES` because we already
add the dependencies to the library target.
|
|
|
5a18c505
|
2023-09-04T09:30:38
|
|
autoconf: Include non-pkg-config dependency flags in the pkg-config file
These were present before, but I accidentally dropped them in my recent
build improvements.
|
|
|
6864d92f
|
2023-09-04T09:25:44
|
|
autoconf: Don't bake build time CFLAGS into pkg-config file
Having slept on it, I've realised that baking the dependency CFLAGS into
the pkg-config file is pointless when it is only used to link against
them. It may even cause problems.
|
|
|
efcaeadc
|
2023-09-04T16:00:53
|
|
hash: Fix use-of-uninitialized-value
Short-lived regression.
|
|
|
05c28305
|
2023-09-04T15:50:22
|
|
dict: Stop using uint32_t
stdint.h is a C99 header.
|
|
|
f45abbd3
|
2023-09-04T15:31:04
|
|
dict: Fix integer overflow of string lengths
Fixes #546.
|
|
|
edc2dd48
|
2023-09-04T16:07:23
|
|
dict: Update hash function
Update hash function from classic Jenkins OAAT (dict.c) and a variant of
DJB2 (hash.c) to "GoodOAAT" taken from the SMHasher repo. This hash
function passes all SMHasher tests.
|
|
|
93e8bb2a
|
2023-09-02T17:12:58
|
|
build: Generate better pkg-config files for static-only builds
pkg-config supports `Requires.private` and `Libs.private` fields for
static linking. However, if you're building a dynamic binary, then
pkg-config will use the non-private fields, even if just the static
libxml2 is available. This will result in libxml2 being underlinked,
causing the build to fail. The solution is to fold the private fields
into the non-private fields when the shared libxml2 is not being built.
This works for Autotools and CMake. Meson also knows how to handle this
when it automatically generates pkg-config files.
|
|
|
4640ccac
|
2023-09-02T16:18:30
|
|
build: Generate better pkg-config file for SYSROOT builds
The -I and -L flags you use to build should not necessarily be the same
ones you bake into installed files. If you are building with
dependencies located under a SYSROOT then the installed files should
have no knowledge of that SYSROOT. For example, if the build requires
`-L/path/to/sysroot/usr/lib/foo` then only `-L/usr/lib/foo` should be
baked into the installed files.
pkg-config is SYSROOT-aware, so this issue can be sidestepped by using
the `Requires` field rather than the `Libs` and `Cflags` fields. This is
easily resolved if you rely solely on pkg-config, but this project falls
back to standard Autoconf checks, so a little more effort is required.
Unfortunately, this issue cannot feasibly be resolved for CMake.
`find_package` is used rather than `pkg_check_modules`, so we cannot
tell whether a pkg-config file for each dependency is present or not,
even if `find_package` uses pkg-config behind the scenes. The CMake
build does not record any dependency -I or -L flags into the pkg-config
file anyway. This is a problem in itself, although these dependencies
are most likely installed to standard locations.
Meson is very much better at handling this, as it generates the
pkg-config file automatically using the correct logic.
|
|
|
54a0b19a
|
2023-09-01T14:52:14
|
|
autoconf: Allow custom --with-icu configure option
|
|
|
c5989473
|
2023-09-01T14:52:11
|
|
dict: Use thread-local storage for PRNG state
|
|
|
57cfd221
|
2023-09-01T14:52:04
|
|
dict: Use xoroshiro64** as PRNG
Stop using rand_r. This enables hash randomization on all platforms.
|
|
|
6d7aaaa8
|
2023-09-01T14:51:55
|
|
dict: Tune hash table growth
Introduce load factor as main trigger and increase MAX_HASH_LEN. This
should make growth behavior more predictable.
Raise size limit to INT_MAX. This avoids quadratic behavior with larger
tables.
|
|
|
4b8f7cf0
|
2023-09-01T13:07:27
|
|
hash: Fix integer overflow of nbElems
|
|
|
bfd7d286
|
2023-08-29T21:16:34
|
|
xmllint: Fix more error messages
|
|
|
373244bc
|
2023-08-29T21:05:32
|
|
xmllint: Fix error message when push parsing empty documents
|
|
|
53050b1d
|
2023-08-29T20:06:43
|
|
parser: More fixes to push parser error handling
|
|
|
bbd918b2
|
2023-08-29T15:56:37
|
|
parser: Fix detection of null bytes
Also suppress misleading extra errors.
Fixes #122.
|
|
|
c6083a32
|
2023-08-29T16:30:22
|
|
parser: Improve error handling in push parser
- Report errors earlier
- Align error messages with pull parser
|
|
|
1edae30f
|
2023-08-29T15:58:22
|
|
parser: Don't check inputNr in xmlParseTryOrFinish
There's no apparent reason for this check. inputNr should always be 1
here.
|
|
|
e48f2695
|
2023-08-29T17:41:18
|
|
parser: Remove push parser debugging code
|
|
|
cde44997
|
2023-08-27T16:35:23
|
|
SAX2: Allow multiple top-level elements
When parsing with HTML_PARSE_NOIMPLIED, the result document can contain
multiple top-level elements. Rework xmlSAX2StartElement to simply add
the element as a child of ctxt->node or ctxt->myDoc.
Don't invoke xmlAddSibling for non-element parents. The context node
should always be an element node.
Fixes #584.
|
|
|
d39f7806
|
2023-08-23T20:24:24
|
|
tree: Fix copying of DTDs
- Don't create multiple DTD nodes.
- Fix UAF if malloc fails.
- Skip DTD nodes if tree module is disabled.
Fixes #583.
|
|
|
4e4c89a4
|
2023-08-21T00:26:01
|
|
doc: Improve documentation of configuration options
|
|
|
778cca38
|
2023-08-20T22:50:57
|
|
legacy: Add stubs for disabled modules
When legacy support is requested, always enable stubs for FTP and
XPointer location modules which were removed from the standard
configuration. Going forward, the --with-legacy configuration option
should be used to provide maximum ABI compatibility.
Fixes #433.
|
|
|
ed3bd052
|
2023-08-20T20:48:10
|
|
parser: Allow to set maximum amplification factor
|
|
|
9d80a2b1
|
2023-08-16T19:45:34
|
|
entities: Don't change doc when encoding entities
doc->encoding shouldn't be touched by xmlEncodeEntitiesInternal.
|
|
|
f1c1f5c6
|
2023-08-16T19:43:02
|
|
parser: Revert change to doc->encoding
Fixes #579.
|
|
|
61b8e097
|
2023-08-16T19:20:47
|
|
parser: Never use UTF-8 encoding handler
|
|
|
507f11ed
|
2023-08-16T15:43:47
|
|
encoding: Remove debugging code
|
|
|
138213ac
|
2023-08-15T12:49:27
|
|
python: Fix tests on MinGW
Add the directory containing libxml2.dll with os.add_dll_directory to
make tests work on MinGW.
This has changed in Python 3.8 but for some reason, the issue only
turned up with Python 3.11 on MinGW. Contrary to documentation, copying
libxml2.dll into the directory containing the .pyd file doesn't work.
|
|
|
e2ab48b9
|
2023-08-14T15:05:30
|
|
malloc-fail: Fix unsigned integer overflow in xmlTextReaderPushData
Return immediately if xmlParserInputBufferRead fails.
Found by OSS-Fuzz, see #344.
|
|
|
0d24fc0a
|
2023-08-14T12:53:49
|
|
html: Remove encoding hack in htmlCreateFileParserCtxt
Switch encoding directly instead of calling htmlCheckEncoding with faked
content.
|
|
|
5db5a704
|
2023-08-09T18:39:14
|
|
html: Fix UAF in htmlCurrentChar
Short-lived regression found by OSS-Fuzz.
|
|
|
b973ceaf
|
2023-08-09T18:37:20
|
|
parser: Fix mistake in xmlDetectEncoding
Short-lived regression.
|
|
|
cb717d7e
|
2023-08-09T16:52:02
|
|
parser: Update line number after coalescing text nodes
This should make the line number of text nodes deterministic. Before,
it depended on the callback sequence which depends on the size of chunks
fed to the parser.
|
|
|
855818bd
|
2023-08-08T15:21:37
|
|
parser: Check for truncated multi-byte sequences
When decoding input data, check whether the "raw" buffer is empty after
parsing the document. Otherwise, the input ends with a truncated
multi-byte sequence which shouldn't be silently ignored.
|
|
|
95e81a36
|
2023-08-08T15:21:31
|
|
parser: Decode all data in xmlCharEncInput
Even with flush set to true, xmlCharEncInput didn't guarantee to decode
all data. This complicated the push parser.
Remove the flush flag and always decode all available data.
Also fix ICU code where the flush flag has a different meaning. Always
set flush to false and retry even with empty input buffers.
|
|
|
834b8123
|
2023-08-08T15:21:28
|
|
parser: Stream data when reading from memory
Don't create a copy of the whole input buffer. Read the data chunk by
chunk to save memory.
Historically, it was probably envisioned to read data from memory
without additional copying. This doesn't work reliably with the current
design of the XML parser which requires a terminating null byte at the
end of input buffers. This lead to xmlReadMemory interfaces, which
expect pointer and size arguments, being changed to make a
zero-terminated copy of the input buffer. Interfaces based on
xmlReadDoc, which actually expect a zero-terminated string and
would make zero-copy operation work, were then simplified to rely on
xmlReadMemoryi, resulting in an unnecessary copy.
To avoid copying (possibly gigabytes) of memory temporarily, we now
stream in-memory input just like content read from files in a
chunk-by-chunk fashion (using a somewhat outdated INPUT_CHUNK size of
250 bytes). As a side effect, we also avoid another copy of the whole
input when handling non-UTF-8 data which was made possible by some
earlier commits.
Interfaces expecting zero-terminated strings now make use of strnlen
which unfortunately isn't part of the standard C library and only
mandated since POSIX 2008.
|
|
|
5aff27ae
|
2023-08-08T15:21:25
|
|
parser: Optimize xmlLoadEntityContent
Load entity content via xmlParserInputBufferGrow, avoiding a copy.
This also fixes an entity size accounting error.
|
|
|
facc2a06
|
2023-08-08T15:21:21
|
|
parser: Don't overwrite EOF parser state
|
|
|
59fa0bb3
|
2023-08-08T15:21:14
|
|
parser: Simplify input pointer updates
The base member always points to the beginning of the buffer.
|
|
|
c88ab7e3
|
2023-08-08T15:19:54
|
|
parser: Don't reinitialize parser input members
The parser input struct should already be initialized.
|
|
|
4ee08155
|
2023-08-08T15:19:51
|
|
encoding: Move rawconsumed accounting to xmlCharEncInput
|
|
|
a0462e2d
|
2023-08-08T15:19:49
|
|
test: Add push parser test with overridden encoding
After recent changes, it should work to call xmlSwitchEncoding to
override the encoding for the push parser. This was never properly
supported, so Chromium and WebKit added a hack to reset the encoding in
the startDocument SAX handler.
|
|
|
ec7be506
|
2023-08-08T15:19:46
|
|
parser: Rework encoding detection
Introduce XML_INPUT_HAS_ENCODING flag for xmlParserInput which is set
when xmlSwitchEncoding is called. The parser can use the flag to
reliably detect whether an encoding was already set via user override,
BOM or other auto-detection. In this case, the encoding declaration
won't be used to switch the encoding.
Before, an inscrutable mix of ctxt->charset, ctxt->input->encoding
and ctxt->input->buf->encoder was used.
Introduce private helper functions to switch encodings used by both the
XML and HTML parser:
- xmlDetectEncoding which skips over the BOM, allowing to remove the
BOM checks from other encoding functions.
- xmlSetDeclaredEncoding, replacing htmlCheckEncodingDirect, which warns
about encoding mismatches.
If users override the encoding, store the declared instead of the actual
encoding in xmlDoc. In this case, the actual encoding is known and the
raw value from the doc is more useful.
Also use the input flags to store the ISO-8859-1 fallback state.
Restrict the fallback to cases where no encoding was specified. (The
fallback is only useful in recovery mode and these days broken UTF-8 is
probably more likely than ISO-8859-1, so it might eventually be removed
completely.)
The 'charset' member of xmlParserCtxt is now unused. The 'encoding'
member of xmlParserInput is now unused.
The 'standalone' member of xmlParserInput is renamed to 'flags'.
A new parser state XML_PARSER_XML_DECL is added for the push parser.
|
|
|
d38e73f9
|
2023-08-08T15:19:44
|
|
parser: Always create UTF-8 in xmlParseReference
It seems that this code path could only be triggered after an encoding
error in recovery mode. Creating char-ref nodes is unnecessary and
typically unexpected.
|
|
|
131d0dc0
|
2023-08-08T15:19:39
|
|
parser: Don't use 'standalone' member of xmlParserInput
The standalone declaration is only parsed in the main input stream.
|
|
|
d9ec182b
|
2023-08-08T15:19:36
|
|
parser: Don't detect encoding in xmlCtxtResetPush
The encoding will be detected in xmlParseTryOrFinish.
|
|
|
3a64f394
|
2023-08-08T15:19:25
|
|
html: Remove some debugging code in htmlParseTryOrFinish
|
|
|
58de9d31
|
2023-08-03T12:00:55
|
|
valid: Fix c1->parent pointer in xmlCopyDocElementContent
Fixes #572.
|
|
|
75693281
|
2023-07-21T14:50:30
|
|
malloc-fail: Fix memory leak in xmlCompileAttributeTest
Found by OSS-Fuzz, see #344.
|
|
|
90bcbcfc
|
2023-07-20T21:08:01
|
|
parser: Fix potential use-after-free in xmlParseCharDataInternal
Return immediately if a SAX handler stops the parser.
Fixes #569.
|
|
|
88447447
|
2023-06-23T23:04:30
|
|
parser: Fix typo in previous commit
|
|
|
9d0541dd
|
2023-06-22T18:06:53
|
|
parser: Make xmlSwitchEncoding always skip the BOM
Chromium calls xmlSwitchEncoding from the start document handler and
relies on this function to skip the BOM. Commit 98840d40 changed the
behavior when switching to UTF-16 since inspecting the input buffer at
this point is fragile.
Revert part of the commit to also skip a potential (decoded UTF-8) BOM
when switching to UTF-16. Make sure that we do this only at the start of
an input stream to avoid U-FEFF characters being lost.
BOM handling should ultimately be moved to the parsing code to avoid
such bugs.
See https://bugs.chromium.org/p/chromium/issues/detail?id=1451026
|
|
2473b485
|
2023-06-21T14:15:02
|
|
autotools: fix Python module file ext for cygwin/msys2
both use .dll, not .pyd
|
|
5f54bac9
|
2023-06-10T10:50:02
|
|
testapi: test_xmlSAXDefaultVersion() leaves xmlSAX2DefaultVersionValue set to 1 with LIBXML_SAX1_ENABLED
Add code to save and to restore the default value of
xmlSAX2DefaultVersionValue.
Fixes #554.
|
|
|
b236b7a5
|
2023-06-08T21:53:05
|
|
parser: Halt parser when growing buffer results in OOM
Fix short-lived regression from previous commit.
It might be safer to make xmlBufSetInputBaseCur use the original buffer
even in case of errors.
Found by OSS-Fuzz.
|
|
|
20f5c734
|
2023-06-07T14:05:34
|
|
parser: Recover more input from encoding errors
Don't halt the parser in xmlParserGrow to allow more input to be
recovered in case of encoding errors.
Fixes #543.
|
|
|
db21cd5d
|
2023-06-06T14:25:30
|
|
malloc-fail: Handle malloc failures in xmlAddEncodingAlias
Avoid memory errors if an allocation fails.
See #344. Fixes #553.
|
|
|
305a75cc
|
2023-06-06T13:15:46
|
|
malloc-fail: Fix null-deref with xmllint --copy
See #344. Fixes #552.
|
|
|
6273df6c
|
2023-05-30T12:30:27
|
|
xpath: Ignore entity ref nodes when computing node hash
XPath queries only work reliably if entities are substituted.
Nevertheless, it's possible to query a document with entity reference
nodes. xmllint even deletes entities when the `--dropdtd` option is
passed, resulting in dangling pointers, so it's best to skip entity
reference nodes to avoid a use-after-free.
Fixes #550.
|
|
|
e2f21c22
|
2023-05-25T13:01:48
|
|
win32: Deprecate old Windows build system
|
|
|
1e8ab697
|
2023-05-25T03:03:33
|
|
gitlab-ci: Lower _XOPEN_SOURCE value
|
|
|
cb8ccb10
|
2023-05-25T03:07:57
|
|
testapi: Don't set http_proxy environment variable
We already disable network access, so this has no effect.
|
|
|
9fd57df8
|
2023-05-25T02:37:57
|
|
autotools: Improve iconv check
Use a custom test program which includes iconv.h, so we can check
whether the possibly redefined symbols in this header file match the
symbols in the iconv library.
Should fix #547.
|
|
|
c3c6cc62
|
2023-05-24T20:08:33
|
|
runtest: Fix compilation without LIBXML_HTML_ENABLED
Fixes #545.
|
|
|
981093ab
|
2023-05-18T19:23:58
|
|
test: Add push parser tests for split UTF-8 sequences
|
|
|
e0f3016f
|
2023-05-18T17:31:44
|
|
parser: Fix regression when push parsing UTF-8 sequences
Partial UTF-8 sequences are allowed when push parsing.
Fixes #542.
|
|
|
687a2b71
|
2023-05-08T17:05:13
|
|
xinclude: Lower initial table size when fuzzing
We don't have test cases with many documents, so set the initial table
size to 1 when fuzzing, so there is a chance to detect reallocation
issues.
|
|
|
c40cbf07
|
2023-05-08T17:03:00
|
|
malloc-fail: Fix null deref after xmlXIncludeNewRef
See #344.
|
|
|
105ce73d
|
2023-05-08T16:45:28
|
|
xinclude: Fix false positives in inclusion loop detection
xmlXIncludeRecurseDoc can realloc the cache.
|
|
|
bdb5667a
|
2023-05-10T18:13:47
|
|
autotools: Fix ICU detection
Fixes #540.
|
|
|
9dae389c
|
2023-05-09T13:28:06
|
|
parser: Fix "huge input lookup" error with push parser
Fix parsing of larger documents without XML_PARSE_HUGE.
Should fix #538.
|
|
|
b8961df6
|
2023-05-09T03:25:24
|
|
SAX: Always validate xml:ids
The behavior shouldn't depend on mostly random configuration options.
|
|
|
f24ffddb
|
2023-05-08T23:33:04
|
|
Stop using sprintf
Switch remaining users to snprintf.
|
|
|
01723fc6
|
2023-05-08T23:12:33
|
|
xpath: Fix build without LIBXML_XPATH_ENABLED
Move static function declaration into XPATH block. Also move comparison
functions.
Fixes #537.
|
|
|
235b15a5
|
2023-05-08T17:58:02
|
|
SAX: Always initialize SAX1 element handlers
Follow-up to commit d0c3f01e. A parser context will be initialized to
SAX version 2, but this can be overridden with XML_PARSE_SAX1 later,
so we must initialize the SAX1 element handlers as well.
Change the check in xmlDetectSAX2 to only look for XML_SAX2_MAGIC, so
we don't switch to SAX1 if the SAX2 element handlers are NULL.
|
|
34630630
|
2023-05-05T17:34:57
|
|
autoconf: fix iconv library paths
and pass cflags when building executables
See 0f77167f for prior related work
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d0c3f01e
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2023-05-06T17:47:37
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parser: Fix old SAX1 parser with custom callbacks
For some reason, xmlCtxtUseOptionsInternal set the start and end element
SAX handlers to the internal DOM builder functions when XML_PARSE_SAX1
was specified. This means that custom SAX handlers could never work with
that flag because these functions would receive the wrong user data
argument and crash immediately.
Fixes #535.
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06a2c251
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2023-05-06T15:28:13
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hash: Fix possible startup crash with old libxslt versions
Call xmlInitParser in xmlHashCreate to make it work if the library
wasn't initialized yet.
Otherwise, exsltRegisterAll from libxslt 1.1.24 or older might cause
a crash.
See #534.
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a800b7e0
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2023-05-04T12:47:00
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regexp: Fix null deref in xmlFAFinishReduceEpsilonTransitions
Short-lived regression found by OSS-Fuzz.
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8d5e33ef
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2023-05-03T20:42:10
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Fix compiler warning on GCC < 8
-Wcast-function-type is only available since GCC 8.
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d6882f64
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2023-05-03T18:33:20
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threads: Fix startup crash with weak symbol hack
Fix another issue when running with older libc, threads and libpthread
not linked in.
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7f3f3f11
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2023-05-03T03:20:14
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dict: Raise MAX_DICT_HASH limit
This fixes quadratic behavior with large dictionaries.
Also rework testdict.c to support tests with larger dictionaries.
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11a95279
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2023-05-02T13:32:24
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win32: Don't depend on removed .def file
Fixes broken build after 21cec82b.
Fixes #532.
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c613ab14
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2023-05-02T00:32:50
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regexp: Fix mistake in previous commit
The `ret = 0` line should have been deleted.
Fixes #531.
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a06eaa61
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2023-03-09T06:58:24
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regexp: Fix determinism checks
Swap arguments in initial call to xmlFARecurseDeterminism.
Fix the check whether we revisit the initial state in
xmlFARecurseDeterminism.
If there are transitions with equal atoms and targets but different
counters, treat the regex as deterministic but mark the transitions as
non-deterministic internally.
Don't overwrite zero return value of xmlFAComputesDeterminism
with non-zero value from xmlFARecurseDeterminism.
Most of these errors lead to non-deterministic regexes not being
detected which typically isn't an issue. The improved code may break
users who relied on buggy behavior or cause other bugs to become
visible.
Fixes #469.
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