./devel/pcre2, Perl Compatible Regular Expressions library (major version 2)

[ CVSweb ] [ Homepage ] [ RSS ] [ Required by ] [ Add to tracker ]


Branch: CURRENT, Version: 10.30nb1, Package name: pcre2-10.30nb1, Maintainer: pkgsrc-users

PCRE2 is a re-working of the original PCRE library to provide an entirely new
API.

PCRE2 is written in C, and it has its own API. There are three sets of
functions, one for the 8-bit library, which processes strings of bytes, one for
the 16-bit library, which processes strings of 16-bit values, and one for the
32-bit library, which processes strings of 32-bit values. There are no C++
wrappers.


Required to build:
[pkgtools/cwrappers]

Package options: pcre2-jit

Master sites: (Expand)

SHA1: 8296dda3476bbb4c90048ff47e3a71f3b2749566
RMD160: 558de9a06531ff6b690abc5b6f587ce2c207f3b5
Filesize: 1546.429 KB

Version history: (Expand)


CVS history: (Expand)


   2017-09-07 16:50:44 by Thomas Klausner | Files touched by this commit (1)
Log message:
Sprinkle some wildcards for arm, I hope it works.
   2017-09-07 15:47:21 by Thomas Klausner | Files touched by this commit (2) | Package updated
Log message:
Make JIT an option. Enable it by default on the list of platforms
martin@ extracted from the source, see PR 52524.

The pattern matching and/or the list itself may need further fixes.

Retest on NetBSD 8 shows that the binaries are now mprotect-safe,
remove variable.

Bump PKGREVISION.
   2017-08-17 21:53:54 by Niclas Rosenvik | Files touched by this commit (4) | Package updated
Log message:
Update pcre2 to version 10.30.

Fixes CVE-2017-8399.
Fixes CVE-2017-7186.
Fixes CVE-2017-8786.

Change Log for PCRE2
--------------------

Version 10.30 14-August-2017
----------------------------

1. The main interpreter, pcre2_match(), has been refactored into a new version
that does not use recursive function calls (and therefore the stack) for
remembering backtracking positions. This makes --disable-stack-for-recursion a
NOOP. The new implementation allows backtracking into recursive group calls in
patterns, making it more compatible with Perl, and also fixes some other
hard-to-do issues such as #1887 in Bugzilla. The code is also cleaner because
the old code had a number of fudges to try to reduce stack usage. It seems to
run no slower than the old code.

A number of bugs in the refactored code were subsequently fixed during testing
before release, but after the code was made available in the repository. These
bugs were never in fully released code, but are noted here for the record.

  (a) If a pattern had fewer capturing parentheses than the ovector supplied in
      the match data block, a memory error (detectable by ASAN) occurred after
      a match, because the external block was being set from non-existent
      internal ovector fields. Fixes oss-fuzz issue 781.

  (b) A pattern with very many capturing parentheses (when the internal frame
      size was greater than the initial frame vector on the stack) caused a
      crash. A vector on the heap is now set up at the start of matching if the
      vector on the stack is not big enough to handle at least 10 frames.
      Fixes oss-fuzz issue 783.

  (c) Handling of (*VERB)s in recursions was wrong in some cases.

  (d) Captures in negative assertions that were used as conditions were not
      happening if the assertion matched via (*ACCEPT).

  (e) Mark values were not being passed out of recursions.

  (f) Refactor some code in do_callout() to avoid picky compiler warnings about
      negative indices. Fixes oss-fuzz issue 1454.

  (g) Similarly refactor the way the variable length ovector is addressed for
      similar reasons. Fixes oss-fuzz issue 1465.

2. Now that pcre2_match() no longer uses recursive function calls (see above),
the "match limit recursion" value seems misnamed. It still exists, and \ 
limits
the depth of tree that is searched. To avoid future confusion, it has been
renamed as "depth limit" in all relevant places (--with-depth-limit,
(*LIMIT_DEPTH), pcre2_set_depth_limit(), etc) but the old names are still
available for backwards compatibility.

3. Hardened pcre2test so as to reduce the number of bugs reported by fuzzers:

  (a) Check for malloc failures when getting memory for the ovector (POSIX) or
      the match data block (non-POSIX).

4. In the 32-bit library in non-UTF mode, an attempt to find a Unicode property
for a character with a code point greater than 0x10ffff (the Unicode maximum)
caused a crash.

5. If a lookbehind assertion that contained a back reference to a group
appearing later in the pattern was compiled with the PCRE2_ANCHORED option,
undefined actions (often a segmentation fault) could occur, depending on what
other options were set. An example assertion is (?<!\1(abc)) where the
reference \1 precedes the group (abc). This fixes oss-fuzz issue 865.

6. Added the PCRE2_INFO_FRAMESIZE item to pcre2_pattern_info() and arranged for
pcre2test to use it to output the frame size when the "framesize" \ 
modifier is
given.

7. Reworked the recursive pattern matching in the JIT compiler to follow the
interpreter changes.

8. When the zero_terminate modifier was specified on a pcre2test subject line
for global matching, unpredictable things could happen. For example, in UTF-8
mode, the pattern //g,zero_terminate read random memory when matched against an
empty string with zero_terminate. This was a bug in pcre2test, not the library.

9. Moved some Windows-specific code in pcre2grep (introduced in 10.23/13) out
of the section that is compiled when Unix-style directory scanning is
available, and into a new section that is always compiled for Windows.

10. In pcre2test, explicitly close the file after an error during serialization
or deserialization (the "load" or "save" commands).

11. Fix memory leak in pcre2_serialize_decode() when the input is invalid.

12. Fix potential NULL dereference in pcre2_callout_enumerate() if called with
a NULL pattern pointer when Unicode support is available.

13. When the 32-bit library was being tested by pcre2test, error messages that
were longer than 64 code units could cause a buffer overflow. This was a bug in
pcre2test.

14. The alternative matching function, pcre2_dfa_match() misbehaved if it
encountered a character class with a possessive repeat, for example [a-f]{3}+.

15. The depth (formerly recursion) limit now applies to DFA matching (as
of 10.23/36); pcre2test has been upgraded so that \=find_limits works with DFA
matching to find the minimum value for this limit.

16. Since 10.21, if pcre2_match() was called with a null context, default
memory allocation functions were used instead of whatever was used when the
pattern was compiled.

17. Changes to the pcre2test "memory" modifier on a subject line. \ 
These apply
only to pcre2_match():

  (a) Warn if null_context is set on both pattern and subject, because the
      memory details cannot then be shown.

  (b) Remember (up to a certain number of) memory allocations and their
      lengths, and list only the lengths, so as to be system-independent.
      (In practice, the new interpreter never has more than 2 blocks allocated
      simultaneously.)

18. Make pcre2test detect an error return from pcre2_get_error_message(), give
a message, and abandon the run (this would have detected #13 above).

19. Implemented PCRE2_ENDANCHORED.

20. Applied Jason Hood's patches (slightly modified) to pcre2grep, to implement
the --output=text (-O) option and the inbuilt callout echo.

21. Extend auto-anchoring etc. to ignore groups with a zero qualifier and
single-branch conditions with a false condition (e.g. DEFINE) at the start of a
branch. For example, /(?(DEFINE)...)^A/ and /(...){0}^B/ are now flagged as
anchored.

22. Added an explicit limit on the amount of heap used by pcre2_match(), set by
pcre2_set_heap_limit() or (*LIMIT_HEAP=xxx). Upgraded pcre2test to show the
heap limit along with other pattern information, and to find the minimum when
the find_limits modifier is set.

23. Write to the last 8 bytes of the pcre2_real_code structure when a compiled
pattern is set up so as to initialize any padding the compiler might have
included. This avoids valgrind warnings when a compiled pattern is copied, in
particular when it is serialized.

24. Remove a redundant line of code left in accidentally a long time ago.

25. Remove a duplication typo in pcre2_tables.c

26. Correct an incorrect cast in pcre2_valid_utf.c

27. Update pcre2test, remove some unused code in pcre2_match(), and upgrade the
tests to improve coverage.

28. Some fixes/tidies as a result of looking at Coverity Scan output:

    (a) Typo: ">" should be ">=" in opcode check in \ 
pcre2_auto_possess.c.
    (b) Added some casts to avoid "suspicious implicit sign extension".
    (c) Resource leaks in pcre2test in rare error cases.
    (d) Avoid warning for never-use case OP_TABLE_LENGTH which is just a fudge
        for checking at compile time that tables are the right size.
    (e) Add missing "fall through" comment.

29. Implemented PCRE2_EXTENDED_MORE and related /xx and (?xx) features.

30. Implement (?n: for PCRE2_NO_AUTO_CAPTURE, because Perl now has this.

31. If more than one of "push", "pushcopy", or \ 
"pushtablescopy" were set in
pcre2test, a crash could occur.

32. Make -bigstack in RunTest allocate a 64Mb stack (instead of 16 MB) so that
all the tests can run with clang's sanitizing options.

33. Implement extra compile options in the compile context and add the first
one: PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES.

34. Implement newline type PCRE2_NEWLINE_NUL.

35. A lookbehind assertion that had a zero-length branch caused undefined
behaviour when processed by pcre2_dfa_match(). This is oss-fuzz issue 1859.

36. The match limit value now also applies to pcre2_dfa_match() as there are
patterns that can use up a lot of resources without necessarily recursing very
deeply. (Compare item 10.23/36.) This should fix oss-fuzz #1761.

37. Implement PCRE2_EXTRA_BAD_ESCAPE_IS_LITERAL.

38. Fix returned offsets from regexec() when REG_STARTEND is used with a
starting offset greater than zero.

39. Implement REG_PEND (GNU extension) for the POSIX wrapper.

40. Implement the subject_literal modifier in pcre2test, and allow jitstack on
pattern lines.

41. Implement PCRE2_LITERAL and use it to support REG_NOSPEC.

42. Implement PCRE2_EXTRA_MATCH_LINE and PCRE2_EXTRA_MATCH_WORD for the benefit
of pcre2grep.

43. Re-implement pcre2grep's -F, -w, and -x options using PCRE2_LITERAL,
PCRE2_EXTRA_MATCH_WORD, and PCRE2_EXTRA_MATCH_LINE. This fixes two bugs:

    (a) The -F option did not work for fixed strings containing \E.
    (b) The -w option did not work for patterns with multiple branches.

44. Added configuration options for the SELinux compatible execmem allocator in
JIT.

45. Increased the limit for searching for a "must be present" code unit in
subjects from 1000 to 2000 for 8-bit searches, since they use memchr() and are
much faster.

46. Arrange for anchored patterns to record and use "first code unit" data,
because this can give a fast "no match" without searching for a \ 
"required code
unit". Previously only non-anchored patterns did this.

47. Upgraded the Unicode tables from Unicode 8.0.0 to Unicode 10.0.0.

48. Add the callout_no_where modifier to pcre2test.

49. Update extended grapheme breaking rules to the latest set that are in
Unicode Standard Annex #29.

50. Added experimental foreign pattern conversion facilities
(pcre2_pattern_convert() and friends).

51. Change the macro FWRITE, used in pcre2grep, to FWRITE_IGNORE because FWRITE
is defined in a system header in cygwin. Also modified some of the #ifdefs in
pcre2grep related to Windows and Cygwin support.

52. Change 3(g) for 10.23 was a bit too zealous. If a hyphen that follows a
character class is the last character in the class, Perl does not give a
warning. PCRE2 now also treats this as a literal.

53. Related to 52, though PCRE2 was throwing an error for [[:digit:]-X] it was
not doing so for [\d-X] (and similar escapes), as is documented.

54. Fixed a MIPS issue in the JIT compiler reported by Joshua Kinard.

55. Fixed a "maybe uninitialized" warning for class_uchardata in \p \ 
handling in
pcre2_compile() which could never actually trigger (code should have been cut
out when Unicode support is disabled).
   2017-02-20 10:44:34 by Thomas Klausner | Files touched by this commit (3) | Package updated
Log message:
Updated pcre2 to 10.23.

Version 10.23 14-February-2017
------------------------------

1. ChangeLog has the details of a lot of bug fixes and tidies.

2. There has been a major re-factoring of the pcre2_compile.c file. Most syntax
checking is now done in the pre-pass that identifies capturing groups. This has
reduced the amount of duplication and made the code tidier. While doing this,
some minor bugs and Perl incompatibilities were fixed (see ChangeLog for
details.)

3. Back references are now permitted in lookbehind assertions when there are
no duplicated group numbers (that is, (?| has not been used), and, if the
reference is by name, there is only one group of that name. The referenced
group must, of course be of fixed length.

4. \g{+<number>} (e.g. \g{+2} ) is now supported. It is a "forward back
reference" and can be useful in repetitions (compare \g{-<number>} ). \ 
Perl does
not recognize this syntax.

5. pcre2grep now automatically expands its buffer up to a maximum set by
--max-buffer-size.

6. The -t option (grand total) has been added to pcre2grep.

7. A new function called pcre2_code_copy_with_tables() exists to copy a
compiled pattern along with a private copy of the character tables that is
uses.

8. A user supplied a number of patches to upgrade pcre2grep under Windows and
tidy the code.

9. Several updates have been made to pcre2test and test scripts (see
ChangeLog).
   2017-01-19 19:52:30 by Alistair G. Crooks | Files touched by this commit (352)
Log message:
Convert all occurrences (353 by my count) of

	MASTER_SITES= 	site1 \
			site2

style continuation lines to be simple repeated

	MASTER_SITES+= site1
	MASTER_SITES+= site2

lines. As previewed on tech-pkg. With thanks to rillig for fixing pkglint
accordingly.
   2016-10-01 12:21:03 by Thomas Klausner | Files touched by this commit (1) | Package updated
Log message:
Enable JIT. Bump PKGREVISION.
   2016-09-11 16:39:27 by Makoto Fujiwara | Files touched by this commit (3) | Package updated
Log message:
Updated devel/pcre to 10.22
---------------------------
Version 10.22 29-July-2016
--------------------------
1. ChangeLog has the details of a number of bug fixes.

2. The POSIX wrapper function regcomp() did not used to support back references
and subroutine calls if called with the REG_NOSUB option. It now does.

3. A new function, pcre2_code_copy(), is added, to make a copy of a compiled
pattern.

4. Support for string callouts is added to pcre2grep.

5. Added the PCRE2_NO_JIT option to pcre2_match().

6. The pcre2_get_error_message() function now returns with a negative error
code if the error number it is given is unknown.

7. Several updates have been made to pcre2test and test scripts (see
ChangeLog).
   2016-01-13 13:31:41 by Niclas Rosenvik | Files touched by this commit (4) | Package updated
Log message:
Update devel/pcre2 to version 10.21.

Change Log for PCRE2
--------------------

Version 10.21 12-January-2016
-----------------------------

1. Improve matching speed of patterns starting with + or * in JIT.

2. Use memchr() to find the first character in an unanchored match in 8-bit
mode in the interpreter. This gives a significant speed improvement.

3. Removed a redundant copy of the opcode_possessify table in the
pcre2_auto_possessify.c source.

4. Fix typos in dftables.c for z/OS.

5. Change 36 for 10.20 broke the handling of [[:>:]] and [[:<:]] in that
processing them could involve a buffer overflow if the following character was
an opening parenthesis.

6. Change 36 for 10.20 also introduced a bug in processing this pattern:
/((?x)(*:0))#(?'/. Specifically: if a setting of (?x) was followed by a (*MARK)
setting (which (*:0) is), then (?x) did not get unset at the end of its group
during the scan for named groups, and hence the external # was incorrectly
treated as a comment and the invalid (?' at the end of the pattern was not
diagnosed. This caused a buffer overflow during the real compile. This bug was
discovered by Karl Skomski with the LLVM fuzzer.

7. Moved the pcre2_find_bracket() function from src/pcre2_compile.c into its
own source module to avoid a circular dependency between src/pcre2_compile.c
and src/pcre2_study.c

8. A callout with a string argument containing an opening square bracket, for
example /(?C$[$)(?<]/, was incorrectly processed and could provoke a buffer
overflow. This bug was discovered by Karl Skomski with the LLVM fuzzer.

9. The handling of callouts during the pre-pass for named group identification
has been tightened up.

10. The quantifier {1} can be ignored, whether greedy, non-greedy, or
possessive. This is a very minor optimization.

11. A possessively repeated conditional group that could match an empty string,
for example, /(?(R))*+/, was incorrectly compiled.

12. The Unicode tables have been updated to Unicode 8.0.0 (thanks to Christian
Persch).

13. An empty comment (?#) in a pattern was incorrectly processed and could
provoke a buffer overflow. This bug was discovered by Karl Skomski with the
LLVM fuzzer.

14. Fix infinite recursion in the JIT compiler when certain patterns such as
/(?:|a|){100}x/ are analysed.

15. Some patterns with character classes involving [: and \\ were incorrectly
compiled and could cause reading from uninitialized memory or an incorrect
error diagnosis. Examples are: /[[:\\](?<[::]/ and /[[:\\](?'abc')[a:]. The
first of these bugs was discovered by Karl Skomski with the LLVM fuzzer.

16. Pathological patterns containing many nested occurrences of [: caused
pcre2_compile() to run for a very long time. This bug was found by the LLVM
fuzzer.

17. A missing closing parenthesis for a callout with a string argument was not
being diagnosed, possibly leading to a buffer overflow. This bug was found by
the LLVM fuzzer.

18. A conditional group with only one branch has an implicit empty alternative
branch and must therefore be treated as potentially matching an empty string.

19. If (?R was followed by - or + incorrect behaviour happened instead of a
diagnostic. This bug was discovered by Karl Skomski with the LLVM fuzzer.

20. Another bug that was introduced by change 36 for 10.20: conditional groups
whose condition was an assertion preceded by an explicit callout with a string
argument might be incorrectly processed, especially if the string contained \Q.
This bug was discovered by Karl Skomski with the LLVM fuzzer.

21. Compiling PCRE2 with the sanitize options of clang showed up a number of
very pedantic coding infelicities and a buffer overflow while checking a UTF-8
string if the final multi-byte UTF-8 character was truncated.

22. For Perl compatibility in EBCDIC environments, ranges such as a-z in a
class, where both values are literal letters in the same case, omit the
non-letter EBCDIC code points within the range.

23. Finding the minimum matching length of complex patterns with back
references and/or recursions can take a long time. There is now a cut-off that
gives up trying to find a minimum length when things get too complex.

24. An optimization has been added that speeds up finding the minimum matching
length for patterns containing repeated capturing groups or recursions.

25. If a pattern contained a back reference to a group whose number was
duplicated as a result of appearing in a (?|...) group, the computation of the
minimum matching length gave a wrong result, which could cause incorrect "no
match" errors. For such patterns, a minimum matching length cannot at present
be computed.

26. Added a check for integer overflow in conditions (?(<digits>) and
(?(R<digits>). This omission was discovered by Karl Skomski with the LLVM
fuzzer.

27. Fixed an issue when \p{Any} inside an xclass did not read the current
character.

28. If pcre2grep was given the -q option with -c or -l, or when handling a
binary file, it incorrectly wrote output to stdout.

29. The JIT compiler did not restore the control verb head in case of *THEN
control verbs. This issue was found by Karl Skomski with a custom LLVM fuzzer.

30. The way recursive references such as (?3) are compiled has been re-written
because the old way was the cause of many issues. Now, conversion of the group
number into a pattern offset does not happen until the pattern has been
completely compiled. This does mean that detection of all infinitely looping
recursions is postponed till match time. In the past, some easy ones were
detected at compile time. This re-writing was done in response to yet another
bug found by the LLVM fuzzer.

31. A test for a back reference to a non-existent group was missing for items
such as \987. This caused incorrect code to be compiled. This issue was found
by Karl Skomski with a custom LLVM fuzzer.

32. Error messages for syntax errors following \g and \k were giving inaccurate
offsets in the pattern.

33. Improve the performance of starting single character repetitions in JIT.

34. (*LIMIT_MATCH=) now gives an error instead of setting the value to 0.

35. Error messages for syntax errors in *LIMIT_MATCH and *LIMIT_RECURSION now
give the right offset instead of zero.

36. The JIT compiler should not check repeats after a {0,1} repeat byte code.
This issue was found by Karl Skomski with a custom LLVM fuzzer.

37. The JIT compiler should restore the control chain for empty possessive
repeats. This issue was found by Karl Skomski with a custom LLVM fuzzer.

38. A bug which was introduced by the single character repetition optimization
was fixed.

39. Match limit check added to recursion. This issue was found by Karl Skomski
with a custom LLVM fuzzer.

40. Arrange for the UTF check in pcre2_match() and pcre2_dfa_match() to look
only at the part of the subject that is relevant when the starting offset is
non-zero.

41. Improve first character match in JIT with SSE2 on x86.

42. Fix two assertion fails in JIT. These issues were found by Karl Skomski
with a custom LLVM fuzzer.

43. Correct the setting of CMAKE_C_FLAGS in CMakeLists.txt (patch from Roy Ivy
III).

44. Fix bug in RunTest.bat for new test 14, and adjust the script for the added
test (there are now 20 in total).

45. Fixed a corner case of range optimization in JIT.

46. Add the ${*MARK} facility to pcre2_substitute().

47. Modifier lists in pcre2test were splitting at spaces without the required
commas.

48. Implemented PCRE2_ALT_VERBNAMES.

49. Fixed two issues in JIT. These were found by Karl Skomski with a custom
LLVM fuzzer.

50. The pcre2test program has been extended by adding the #newline_default
command. This has made it possible to run the standard tests when PCRE2 is
compiled with either CR or CRLF as the default newline convention. As part of
this work, the new command was added to several test files and the testing
scripts were modified. The pcre2grep tests can now also be run when there is no
LF in the default newline convention.

51. The RunTest script has been modified so that, when JIT is used and valgrind
is specified, a valgrind suppressions file is set up to ignore "Invalid read of
size 16" errors because these are false positives when the hardware supports
the SSE2 instruction set.

52. It is now possible to have comment lines amid the subject strings in
pcre2test (and perltest.sh) input.

53. Implemented PCRE2_USE_OFFSET_LIMIT and pcre2_set_offset_limit().

54. Add the null_context modifier to pcre2test so that calling pcre2_compile()
and the matching functions with NULL contexts can be tested.

55. Implemented PCRE2_SUBSTITUTE_EXTENDED.

56. In a character class such as [\W\p{Any}] where both a negative-type escape
("not a word character") and a property escape were present, the property
escape was being ignored.

57. Fixed integer overflow for patterns whose minimum matching length is very,
very large.

58. Implemented --never-backslash-C.

59. Change 55 above introduced a bug by which certain patterns provoked the
erroneous error "\ at end of pattern".

60. The special sequences [[:<:]] and [[:>:]] gave rise to incorrect compiling
errors or other strange effects if compiled in UCP mode. Found with libFuzzer
and AddressSanitizer.

61. Whitespace at the end of a pcre2test pattern line caused a spurious error
message if there were only single-character modifiers. It should be ignored.

62. The use of PCRE2_NO_AUTO_CAPTURE could cause incorrect compilation results
or segmentation errors for some patterns. Found with libFuzzer and
AddressSanitizer.

63. Very long names in (*MARK) or (*THEN) etc. items could provoke a buffer
overflow.

64. Improve error message for overly-complicated patterns.

65. Implemented an optional replication feature for patterns in pcre2test, to
make it easier to test long repetitive patterns. The tests for 63 above are
converted to use the new feature.

66. In the POSIX wrapper, if regerror() was given too small a buffer, it could
misbehave.

67. In pcre2_substitute() in UTF mode, the UTF validity check on the
replacement string was happening before the length setting when the replacement
string was zero-terminated.

68. In pcre2_substitute() in UTF mode, PCRE2_NO_UTF_CHECK can be set for the
second and subsequent calls to pcre2_match().

69. There was no check for integer overflow for a replacement group number in
pcre2_substitute(). An added check for a number greater than the largest group
number in the pattern means this is not now needed.

70. The PCRE2-specific VERSION condition didn't work correctly if only one
digit was given after the decimal point, or if more than two digits were given.
It now works with one or two digits, and gives a compile time error if more are
given.

71. In pcre2_substitute() there was the possibility of reading one code unit
beyond the end of the replacement string.

72. The code for checking a subject's UTF-32 validity for a pattern with a
lookbehind involved an out-of-bounds pointer, which could potentially cause
trouble in some environments.

73. The maximum lookbehind length was incorrectly calculated for patterns such
as /(?<=(a)(?-1))x/ which have a recursion within a backreference.

74. Give an error if a lookbehind assertion is longer than 65535 code units.

75. Give an error in pcre2_substitute() if a match ends before it starts (as a
result of the use of \K).

76. Check the length of subpattern names and the names in (*MARK:xx) etc.
dynamically to avoid the possibility of integer overflow.

77. Implement pcre2_set_max_pattern_length() so that programs can restrict the
size of patterns that they are prepared to handle.

78. (*NO_AUTO_POSSESS) was not working.

79. Adding group information caching improves the speed of compiling when
checking whether a group has a fixed length and/or could match an empty string,
especially when recursion or subroutine calls are involved. However, this
cannot be used when (?| is present in the pattern because the same number may
be used for groups of different sizes. To catch runaway patterns in this
situation, counts have been introduced to the functions that scan for empty
branches or compute fixed lengths.

80. Allow for the possibility of the size of the nest_save structure not being
a factor of the size of the compiling workspace (it currently is).

81. Check for integer overflow in minimum length calculation and cap it at
65535.

82. Small optimizations in code for finding the minimum matching length.

83. Lock out configuring for EBCDIC with non-8-bit libraries.

84. Test for error code <= 0 in regerror().

85. Check for too many replacements (more than INT_MAX) in pcre2_substitute().

86. Avoid the possibility of computing with an out-of-bounds pointer (though
not dereferencing it) while handling lookbehind assertions.

87. Failure to get memory for the match data in regcomp() is now given as a
regcomp() error instead of waiting for regexec() to pick it up.

88. In pcre2_substitute(), ensure that CRLF is not split when it is a valid
newline sequence.

89. Paranoid check in regcomp() for bad error code from pcre2_compile().

90. Run test 8 (internal offsets and code sizes) for link sizes 3 and 4 as well
as for link size 2.

91. Document that JIT has a limit on pattern size, and give more information
about JIT compile failures in pcre2test.

92. Implement PCRE2_INFO_HASBACKSLASHC.

93. Re-arrange valgrind support code in pcre2test to avoid spurious reports
with JIT (possibly caused by SSE2?).

94. Support offset_limit in JIT.

95. A sequence such as [[:punct:]b] that is, a POSIX character class followed
by a single ASCII character in a class item, was incorrectly compiled in UCP
mode. The POSIX class got lost, but only if the single character followed it.

96. [:punct:] in UCP mode was matching some characters in the range 128-255
that should not have been matched.

97. If [:^ascii:] or [:^xdigit:] are present in a non-negated class, all
characters with code points greater than 255 are in the class. When a Unicode
property was also in the class (if PCRE2_UCP is set, escapes such as \w are
turned into Unicode properties), wide characters were not correctly handled,
and could fail to match.

98. In pcre2test, make the "startoffset" modifier a synonym of \ 
"offset",
because it sets the "startoffset" parameter for pcre2_match().

99. If PCRE2_AUTO_CALLOUT was set on a pattern that had a (?# comment between
an item and its qualifier (for example, A(?#comment)?B) pcre2_compile()
misbehaved. This bug was found by the LLVM fuzzer.

100. The error for an invalid UTF pattern string always gave the code unit
offset as zero instead of where the invalidity was found.

101. Further to 97 above, negated classes such as [^[:^ascii:]\d] were also not
working correctly in UCP mode.

102. Similar to 99 above, if an isolated \E was present between an item and its
qualifier when PCRE2_AUTO_CALLOUT was set, pcre2_compile() misbehaved. This bug
was found by the LLVM fuzzer.

103. The POSIX wrapper function regexec() crashed if the option REG_STARTEND
was set when the pmatch argument was NULL. It now returns REG_INVARG.

104. Allow for up to 32-bit numbers in the ordin() function in pcre2grep.

105. An empty \Q\E sequence between an item and its qualifier caused
pcre2_compile() to misbehave when auto callouts were enabled. This bug
was found by the LLVM fuzzer.

106. If both PCRE2_ALT_VERBNAMES and PCRE2_EXTENDED were set, and a (*MARK) or
other verb "name" ended with whitespace immediately before the closing
parenthesis, pcre2_compile() misbehaved. Example: /(*:abc )/, but only when
both those options were set.

107. In a number of places pcre2_compile() was not handling NULL characters
correctly, and pcre2test with the "bincode" modifier was not always \ 
correctly
displaying fields containing NULLS:

   (a) Within /x extended #-comments
   (b) Within the "name" part of (*MARK) and other *verbs
   (c) Within the text argument of a callout

108. If a pattern that was compiled with PCRE2_EXTENDED started with white
space or a #-type comment that was followed by (?-x), which turns off
PCRE2_EXTENDED, and there was no subsequent (?x) to turn it on again,
pcre2_compile() assumed that (?-x) applied to the whole pattern and
consequently mis-compiled it. This bug was found by the LLVM fuzzer. The fix
for this bug means that a setting of any of the (?imsxU) options at the start
of a pattern is no longer transferred to the options that are returned by
PCRE2_INFO_ALLOPTIONS. In fact, this was an anachronism that should have
changed when the effects of those options were all moved to compile time.

109. An escaped closing parenthesis in the "name" part of a (*verb) when
PCRE2_ALT_VERBNAMES was set caused pcre2_compile() to malfunction. This bug
was found by the LLVM fuzzer.

110. Implemented PCRE2_SUBSTITUTE_UNSET_EMPTY, and updated pcre2test to make it
possible to test it.

111. "Harden" pcre2test against ridiculously large values in modifiers and
command line arguments.

112. Implemented PCRE2_SUBSTITUTE_UNKNOWN_UNSET and PCRE2_SUBSTITUTE_OVERFLOW_
LENGTH.

113. Fix printing of *MARK names that contain binary zeroes in pcre2test.