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-revision 402 by ph10,
Sat Mar 21 17:26:03 2009 UTC
+revision 489 by ph10,
Tue Jan 19 16:42:21 2010 UTC
 Line 1
  ChangeLog for PCRE
  ------------------
- Version 7.9 xx-xxx-09
+ Version 8.01 19-Jan-2010
+ ------------------------
+.  If a pattern contained a conditional subpattern with only one branch (in
+     particular, this includes all (*DEFINE) patterns), a call to pcre_study()
+     computed the wrong minimum data length (which is of course zero for such
+     subpatterns). This could cause incorrect "no match" results.
+.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
+     the pattern is reset in the first branch, pcre_compile() failed with
+     "internal error: code overflow at offset...". This happened only when
+     the reset was to the original external option setting. (An optimization
+     abstracts leading options settings into an external setting, which was the
+     cause of this.)
+.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
+     of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
+     assertion pattern did not match (meaning that the assertion was true), it
+     was incorrectly treated as false if the SKIP had been reached during the
+     matching. This also applied to assertions used as conditions.
+.  If an item that is not supported by pcre_dfa_exec() was encountered in an
+     assertion subpattern, including such a pattern used as a condition,
+     unpredictable results occurred, instead of the error return
+     PCRE_ERROR_DFA_UITEM.
+.  The C++ GlobalReplace function was not working like Perl for the special
+     situation when an empty string is matched. It now does the fancy magic
+     stuff that is necessary.
+.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
+     removed. (These were left over from very, very early versions of PCRE.)
+.  Some cosmetic changes to the code to make life easier when compiling it
+     as part of something else:
+     (a) Change DEBUG to PCRE_DEBUG.
+     (b) In pcre_compile(), rename the member of the "branch_chain" structure
+         called "current" as "current_branch", to prevent a collision with the
+         Linux macro when compiled as a kernel module.
+     (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
+         prevent a collision with the Linux macro when compiled as a kernel
+         module.
+.  In pcre_compile() there are some checks for integer overflows that used to
+     cast potentially large values to (double). This has been changed to that
+     when building, a check for int64_t is made, and if it is found, it is used
+     instead, thus avoiding the use of floating point arithmetic. (There is no
+     other use of FP in PCRE.) If int64_t is not found, the fallback is to
+     double.
+.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
+(difference between two addresses compared to an unsigned value).
+. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
+     custom one, because of the following reported problem in Windows:
+       - libbz2 uses the Pascal calling convention (WINAPI) for the functions
+           under Win32.
+       - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
+           therefore missing the function definition.
+       - The compiler thus generates a "C" signature for the test function.
+       - The linker fails to find the "C" function.
+       - PCRE fails to configure if asked to do so against libbz2.
+. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
+     messages were output:
+       Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
+       rerunning libtoolize, to keep the correct libtool macros in-tree.
+       Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
+     I have done both of these things.
+. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
+     most of the time, it *can* run out if it is given a pattern that contains a
+     runaway infinite recursion. I updated the discussion in the pcrestack man
+     page.
+. Now that we have gone to the x.xx style of version numbers, the minor
+     version may start with zero. Using 08 or 09 is a bad idea because users
+     might check the value of PCRE_MINOR in their code, and 08 or 09 may be
+     interpreted as invalid octal numbers. I've updated the previous comment in
+     configure.ac, and also added a check that gives an error if 08 or 09 are
+     used.
+. Change 8.00/11 was not quite complete: code had been accidentally omitted,
+     causing partial matching to fail when the end of the subject matched \W
+     in a UTF-8 pattern where \W was quantified with a minimum of 3.
+. There were some discrepancies between the declarations in pcre_internal.h
+     of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
+     their definitions. The declarations used "const uschar *" and the
+     definitions used USPTR. Even though USPTR is normally defined as "const
+     unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
+     reported that: "This difference in casting confuses some C++ compilers, for
+     example, SunCC recognizes above declarations as different functions and
+     generates broken code for hbpcre." I have changed the declarations to use
+     USPTR.
+. GNU libtool is named differently on some systems. The autogen.sh script now
+     tries several variants such as glibtoolize (MacOSX) and libtoolize1x
+     (FreeBSD).
+. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
+     (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
+     comment: "Figure out how to create a longlong from a string: strtoll and
+     equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
+     instance, but it only takes 2 args instead of 3!"
+. A subtle bug concerned with back references has been fixed by a change of
+     specification, with a corresponding code fix. A pattern such as
+     ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
+     refers, was giving matches when it shouldn't. For example, xa=xaaa would
+     match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
+     same bug. Such groups have to be quantified to be useful, or contained
+     inside another quantified group. (If there's no repetition, the reference
+     can never match.) The problem arises because, having left the group and
+     moved on to the rest of the pattern, a later failure that backtracks into
+     the group uses the captured value from the final iteration of the group
+     rather than the correct earlier one. I have fixed this in PCRE by forcing
+     any group that contains a reference to itself to be an atomic group; that
+     is, there cannot be any backtracking into it once it has completed. This is
+     similar to recursive and subroutine calls.
+ Version 8.00 19-Oct-09
+ ----------------------
+.  The table for translating pcre_compile() error codes into POSIX error codes
+     was out-of-date, and there was no check on the pcre_compile() error code
+     being within the table. This could lead to an OK return being given in
+     error.
+.  Changed the call to open a subject file in pcregrep from fopen(pathname,
+     "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
+     in a Windows environment.
+.  The pcregrep --count option prints the count for each file even when it is
+     zero, as does GNU grep. However, pcregrep was also printing all files when
+     --files-with-matches was added. Now, when both options are given, it prints
+     counts only for those files that have at least one match. (GNU grep just
+     prints the file name in this circumstance, but including the count seems
+     more useful - otherwise, why use --count?) Also ensured that the
+     combination -clh just lists non-zero counts, with no names.
+.  The long form of the pcregrep -F option was incorrectly implemented as
+     --fixed_strings instead of --fixed-strings. This is an incompatible change,
+     but it seems right to fix it, and I didn't think it was worth preserving
+     the old behaviour.
+.  The command line items --regex=pattern and --regexp=pattern were not
+     recognized by pcregrep, which required --regex pattern or --regexp pattern
+     (with a space rather than an '='). The man page documented the '=' forms,
+     which are compatible with GNU grep; these now work.
+.  No libpcreposix.pc file was created for pkg-config; there was just
+     libpcre.pc and libpcrecpp.pc. The omission has been rectified.
+.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
+     when UCP support is not needed, by modifying the Python script that
+     generates it from Unicode data files. This should not matter if the module
+     is correctly used as a library, but I received one complaint about 50K of
+     unwanted data. My guess is that the person linked everything into his
+     program rather than using a library. Anyway, it does no harm.
+.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
+     was a minimum greater than 1 for a wide character in a possessive
+     repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
+     which had an unlimited repeat of a nested, fixed maximum repeat of a wide
+     character. Chaos in the form of incorrect output or a compiling loop could
+     result.
+.  The restrictions on what a pattern can contain when partial matching is
+     requested for pcre_exec() have been removed. All patterns can now be
+     partially matched by this function. In addition, if there are at least two
+     slots in the offset vector, the offset of the earliest inspected character
+     for the match and the offset of the end of the subject are set in them when
+     PCRE_ERROR_PARTIAL is returned.
+. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
+     synonymous with PCRE_PARTIAL, for backwards compatibility, and
+     PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
+     and may be more useful for multi-segment matching.
+. Partial matching with pcre_exec() is now more intuitive. A partial match
+     used to be given if ever the end of the subject was reached; now it is
+     given only if matching could not proceed because another character was
+     needed. This makes a difference in some odd cases such as Z(*FAIL) with the
+     string "Z", which now yields "no match" instead of "partial match". In the
+     case of pcre_dfa_exec(), "no match" is given if every matching path for the
+     final character ended with (*FAIL).
+. Restarting a match using pcre_dfa_exec() after a partial match did not work
+     if the pattern had a "must contain" character that was already found in the
+     earlier partial match, unless partial matching was again requested. For
+     example, with the pattern /dog.(body)?/, the "must contain" character is
+     "g". If the first part-match was for the string "dog", restarting with
+     "sbody" failed. This bug has been fixed.
+. The string returned by pcre_dfa_exec() after a partial match has been
+     changed so that it starts at the first inspected character rather than the
+     first character of the match. This makes a difference only if the pattern
+     starts with a lookbehind assertion or \b or \B (\K is not supported by
+     pcre_dfa_exec()). It's an incompatible change, but it makes the two
+     matching functions compatible, and I think it's the right thing to do.
+. Added a pcredemo man page, created automatically from the pcredemo.c file,
+     so that the demonstration program is easily available in environments where
+     PCRE has not been installed from source.
+. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
+     libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
+     library.
+. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
+     It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
+     is not the first non-POSIX option to be added. Clearly some people find
+     these options useful.
+. If a caller to the POSIX matching function regexec() passes a non-zero
+     value for nmatch with a NULL value for pmatch, the value of
+     nmatch is forced to zero.
+. RunGrepTest did not have a test for the availability of the -u option of
+     the diff command, as RunTest does. It now checks in the same way as
+     RunTest, and also checks for the -b option.
+. If an odd number of negated classes containing just a single character
+     interposed, within parentheses, between a forward reference to a named
+     subpattern and the definition of the subpattern, compilation crashed with
+     an internal error, complaining that it could not find the referenced
+     subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
+     [The bug was that it was starting one character too far in when skipping
+     over the character class, thus treating the ] as data rather than
+     terminating the class. This meant it could skip too much.]
+. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
+     /g option in pcretest when the pattern contains \K, which makes it possible
+     to have an empty string match not at the start, even when the pattern is
+     anchored. Updated pcretest and pcredemo to use this option.
+. If the maximum number of capturing subpatterns in a recursion was greater
+     than the maximum at the outer level, the higher number was returned, but
+     with unset values at the outer level. The correct (outer level) value is
+     now given.
+. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
+     PCRE did not set those parentheses (unlike Perl). I have now found a way to
+     make it do so. The string so far is captured, making this feature
+     compatible with Perl.
+. The tests have been re-organized, adding tests 11 and 12, to make it
+     possible to check the Perl 5.10 features against Perl 5.10.
+. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
+     pattern matches a fixed length string. PCRE did not allow this; now it
+     does. Neither allows recursion.
+. I finally figured out how to implement a request to provide the minimum
+     length of subject string that was needed in order to match a given pattern.
+     (It was back references and recursion that I had previously got hung up
+     on.) This code has now been added to pcre_study(); it finds a lower bound
+     to the length of subject needed. It is not necessarily the greatest lower
+     bound, but using it to avoid searching strings that are too short does give
+     some useful speed-ups. The value is available to calling programs via
+     pcre_fullinfo().
+. While implementing 25, I discovered to my embarrassment that pcretest had
+     not been passing the result of pcre_study() to pcre_dfa_exec(), so the
+     study optimizations had never been tested with that matching function.
+     Oops. What is worse, even when it was passed study data, there was a bug in
+     pcre_dfa_exec() that meant it never actually used it. Double oops. There
+     were also very few tests of studied patterns with pcre_dfa_exec().
+. If (?| is used to create subpatterns with duplicate numbers, they are now
+     allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
+     on the other side of the coin, they are no longer allowed to have different
+     names, because these cannot be distinguished in PCRE, and this has caused
+     confusion. (This is a difference from Perl.)
+. When duplicate subpattern names are present (necessarily with different
+     numbers, as required by 27 above), and a test is made by name in a
+     conditional pattern, either for a subpattern having been matched, or for
+     recursion in such a pattern, all the associated numbered subpatterns are
+     tested, and the overall condition is true if the condition is true for any
+     one of them. This is the way Perl works, and is also more like the way
+     testing by number works.
+ Version 7.9 11-Apr-09
  ---------------------
 .  When building with support for bzlib/zlib (pcregrep) and/or readline
-Line 17 
 Version 7.9 xx-xxx-09
+Line 309 
 Version 7.9 xx-xxx-09
      but BOOL is not.
 .  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
-     PCRE_MATCH_LIMIT_RETURSION values as ints, when they should be long ints.
+     PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
 .  The pcregrep documentation said spaces were inserted as well as colons (or
      hyphens) following file names and line numbers when outputting matching
-Line 42 
 Version 7.9 xx-xxx-09
+Line 334 
 Version 7.9 xx-xxx-09
      correctly handled. The rule now is that both the assertion and what follows
      in the first alternative must satisfy the test.
 .  If auto-callout was enabled in a pattern with a conditional group whose
      condition was an assertion, PCRE could crash during matching, both with
      pcre_exec() and pcre_dfa_exec().
-Line 64 
 Version 7.9 xx-xxx-09
+Line 356 
 Version 7.9 xx-xxx-09
 . Implemented support for UTF-8 encoding in EBCDIC environments, a patch
      from Martin Jerabek that uses macro names for all relevant character and
      string constants.
 . Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
      SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
      SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
      these, but not everybody uses configure.
 . A conditional group that had only one branch was not being correctly
      recognized as an item that could match an empty string. This meant that an
      enclosing group might also not be so recognized, causing infinite looping
      (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
      with the subject "ab", where knowledge that the repeated group can match
      nothing is needed in order to break the loop.
 . If a pattern that was compiled with callouts was matched using pcre_dfa_
      exec(), but without supplying a callout function, matching went wrong.
 . If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
      leak if the size of the offset vector was greater than 30. When the vector
      is smaller, the saved offsets during recursion go onto a local stack
      vector, but for larger vectors malloc() is used. It was failing to free
      when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
      error, in fact).
 . There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
      heapframe that is used only when UTF-8 support is enabled. This caused no
      problem, but was untidy.
+. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
+     CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
+     included within another project.
+. Steven Van Ingelgem's patches to add more options to the CMake support,
+     slightly modified by me:
+       (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
+           not building pcregrep.
+       (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
+           if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
+. Forward references, both numeric and by name, in patterns that made use of
+     duplicate group numbers, could behave incorrectly or give incorrect errors,
+     because when scanning forward to find the reference group, PCRE was not
+     taking into account the duplicate group numbers. A pattern such as
+     ^X(?3)(a)(?|(b)|(q))(Y) is an example.
+. Changed a few more instances of "const unsigned char *" to USPTR, making
+     the feature of a custom pointer more persuasive (as requested by a user).
+. Wrapped the definitions of fileno and isatty for Windows, which appear in
+     pcretest.c, inside #ifndefs, because it seems they are sometimes already
+     pre-defined.
+. Added support for (*UTF8) at the start of a pattern.
+. Arrange for flags added by the "release type" setting in CMake to be shown
+     in the configuration summary.
  Version 7.8 05-Sep-08

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