/[pcre]/code/trunk/ChangeLog

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-revision 9 by nigel,
Sat Feb 24 21:38:13 2007 UTC
+revision 57 by nigel,
Sat Feb 24 21:39:50 2007 UTC
 Line 1
  ChangeLog for PCRE
  ------------------
+ Version 3.7 29-Oct-01
+ ---------------------
+. In updating pcretest to check change 1 of version 3.6, I screwed up.
+ This caused pcretest, when used on the test data, to segfault. Unfortunately,
+ this didn't happen under Solaris 8, where I normally test things.
+ Version 3.6 23-Oct-01
+ ---------------------
+. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
+ offsets passed as NULL with zero offset count.
+. The config.guess and config.sub files had not been updated when I moved to
+ the latest autoconf.
+ Version 3.5 15-Aug-01
+ ---------------------
+. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
+ had been forgotten.
+. By using declared but undefined structures, we can avoid using "void"
+ definitions in pcre.h while keeping the internal definitions of the structures
+ private.
+. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
+ user point of view, this means that both static and shared libraries are built
+ by default, but this can be individually controlled. More of the work of
+ handling this static/shared cases is now inside libtool instead of PCRE's make
+ file.
+. The pcretest utility is now installed along with pcregrep because it is
+ useful for users (to test regexs) and by doing this, it automatically gets
+ relinked by libtool. The documentation has been turned into a man page, so
+ there are now .1, .txt, and .html versions in /doc.
+. Upgrades to pcregrep:
+    (i)   Added long-form option names like gnu grep.
+    (ii)  Added --help to list all options with an explanatory phrase.
+    (iii) Added -r, --recursive to recurse into sub-directories.
+    (iv)  Added -f, --file to read patterns from a file.
+. pcre_exec() was referring to its "code" argument before testing that
+ argument for NULL (and giving an error if it was NULL).
+. Upgraded Makefile.in to allow for compiling in a different directory from
+ the source directory.
+. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
+ options bits, the pointer it was passed was to an int instead of to an unsigned
+ long int. This mattered only on 64-bit systems.
+. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
+ generated) instead of pcre.in, which it its source. Also made the same change
+ in several of the .c files.
+. A new release of gcc defines printf() as a macro, which broke pcretest
+ because it had an ifdef in the middle of a string argument for printf(). Fixed
+ by using separate calls to printf().
+. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
+ script, to force use of CR or LF instead of \n in the source. On non-Unix
+ systems, the value can be set in config.h.
+. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
+ absolute limit. Changed the text of the error message to make this clear, and
+ likewise updated the man page.
+. The limit of 99 on the number of capturing subpatterns has been removed.
+ The new limit is 65535, which I hope will not be a "real" limit.
+ Version 3.4 22-Aug-00
+ ---------------------
+. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
+. Diagnose condition (?(0) as an error instead of crashing on matching.
+ Version 3.3 01-Aug-00
+ ---------------------
+. If an octal character was given, but the value was greater than \377, it
+ was not getting masked to the least significant bits, as documented. This could
+ lead to crashes in some systems.
+. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
+ the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
+. Added the functions pcre_free_substring() and pcre_free_substring_list().
+ These just pass their arguments on to (pcre_free)(), but they are provided
+ because some uses of PCRE bind it to non-C systems that can call its functions,
+ but cannot call free() or pcre_free() directly.
+. Add "make test" as a synonym for "make check". Corrected some comments in
+ the Makefile.
+. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
+ Makefile.
+. Changed the name of pgrep to pcregrep, because Solaris has introduced a
+ command called pgrep for grepping around the active processes.
+. Added the beginnings of support for UTF-8 character strings.
+. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
+ RANLIB to ./ltconfig so that they are used by libtool. I think these are all
+ the relevant ones. (AR is not passed because ./ltconfig does its own figuring
+ out for the ar command.)
+ Version 3.2 12-May-00
+ ---------------------
+ This is purely a bug fixing release.
+. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
+ of ZA. This was just one example of several cases that could provoke this bug,
+ which was introduced by change 9 of version 2.00. The code for breaking
+ infinite loops after an iteration that matches an empty string was't working
+ correctly.
+. The pcretest program was not imitating Perl correctly for the pattern /a*/g
+ when matched against abbab (for example). After matching an empty string, it
+ wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
+ caused it to match further down the string than it should.
+. The code contained an inclusion of sys/types.h. It isn't clear why this
+ was there because it doesn't seem to be needed, and it causes trouble on some
+ systems, as it is not a Standard C header. It has been removed.
+. Made 4 silly changes to the source to avoid stupid compiler warnings that
+ were reported on the Macintosh. The changes were from
+   while ((c = *(++ptr)) != 0 && c != '\n');
+ to
+   while ((c = *(++ptr)) != 0 && c != '\n') ;
+ Totally extraordinary, but if that's what it takes...
+. PCRE is being used in one environment where neither memmove() nor bcopy() is
+ available. Added HAVE_BCOPY and an autoconf test for it; if neither
+ HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
+ assumes the way PCRE uses memmove() (always moving upwards).
+. PCRE is being used in one environment where strchr() is not available. There
+ was only one use in pcre.c, and writing it out to avoid strchr() probably gives
+ faster code anyway.
+ Version 3.1 09-Feb-00
+ ---------------------
+ The only change in this release is the fixing of some bugs in Makefile.in for
+ the "install" target:
+ (1) It was failing to install pcreposix.h.
+ (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
+ Version 3.0 01-Feb-00
+ ---------------------
+. Add support for the /+ modifier to perltest (to output $` like it does in
+ pcretest).
+. Add support for the /g modifier to perltest.
+. Fix pcretest so that it behaves even more like Perl for /g when the pattern
+ matches null strings.
+. Fix perltest so that it doesn't do unwanted things when fed an empty
+ pattern. Perl treats empty patterns specially - it reuses the most recent
+ pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
+ effect.
+. The POSIX interface was broken in that it was just handing over the POSIX
+ captured string vector to pcre_exec(), but (since release 2.00) PCRE has
+ required a bigger vector, with some working space on the end. This means that
+ the POSIX wrapper now has to get and free some memory, and copy the results.
+. Added some simple autoconf support, placing the test data and the
+ documentation in separate directories, re-organizing some of the
+ information files, and making it build pcre-config (a GNU standard). Also added
+ libtool support for building PCRE as a shared library, which is now the
+ default.
+. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
+are not valid octal constants. Single digits will be used for minor values
+ less than 10.
+. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
+ existing programs that set these in the POSIX interface can use PCRE without
+ modification.
+. Added a new function, pcre_fullinfo() with an extensible interface. It can
+ return all that pcre_info() returns, plus additional data. The pcre_info()
+ function is retained for compatibility, but is considered to be obsolete.
+. Added experimental recursion feature (?R) to handle one common case that
+ Perl 5.6 will be able to do with (?p{...}).
+. Added support for POSIX character classes like [:alpha:], which Perl is
+ adopting.
+ Version 2.08 31-Aug-99
+ ----------------------
+. When startoffset was not zero and the pattern began with ".*", PCRE was not
+ trying to match at the startoffset position, but instead was moving forward to
+ the next newline as if a previous match had failed.
+. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
+ and could get into a loop if a null string was matched other than at the start
+ of the subject.
+. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
+ be distinguished at compile time, and for completeness also added PCRE_DATE.
+. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
+ in GnuWin32 environments.
+ Version 2.07 29-Jul-99
+ ----------------------
+. The documentation is now supplied in plain text form and HTML as well as in
+ the form of man page sources.
+. C++ compilers don't like assigning (void *) values to other pointer types.
+ In particular this affects malloc(). Although there is no problem in Standard
+ C, I've put in casts to keep C++ compilers happy.
+. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
+ should be (const char *).
+. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
+ be useful for non-Unix systems who don't want to bother with the POSIX stuff.
+ However, I haven't made this a standard facility. The documentation doesn't
+ mention it, and the Makefile doesn't support it.
+. The Makefile now contains an "install" target, with editable destinations at
+ the top of the file. The pcretest program is not installed.
+. pgrep -V now gives the PCRE version number and date.
+. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
+ causing the entire string to be ignored, instead of just the last character.
+. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
+ non-matching string, it can take a very, very long time, even for strings of
+ quite modest length, because of the nested recursion. PCRE now does better in
+ some of these cases. It does this by remembering the last required literal
+ character in the pattern, and pre-searching the subject to ensure it is present
+ before running the real match. In other words, it applies a heuristic to detect
+ some types of certain failure quickly, and in the above example, if presented
+ with a string that has no trailing " it gives "no match" very quickly.
+. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
+ other alternatives are tried instead.
+ Version 2.06 09-Jun-99
+ ----------------------
+. Change pcretest's output for amount of store used to show just the code
+ space, because the remainder (the data block) varies in size between 32-bit and
+-bit systems.
+. Added an extra argument to pcre_exec() to supply an offset in the subject to
+ start matching at. This allows lookbehinds to work when searching for multiple
+ occurrences in a string.
+. Added additional options to pcretest for testing multiple occurrences:
+    /+   outputs the rest of the string that follows a match
+    /g   loops for multiple occurrences, using the new startoffset argument
+    /G   loops for multiple occurrences by passing an incremented pointer
+. PCRE wasn't doing the "first character" optimization for patterns starting
+ with \b or \B, though it was doing it for other lookbehind assertions. That is,
+ it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
+ the letter 'x'. On long subject strings, this gives a significant speed-up.
+ Version 2.05 21-Apr-99
+ ----------------------
+. Changed the type of magic_number from int to long int so that it works
+ properly on 16-bit systems.
+. Fixed a bug which caused patterns starting with .* not to work correctly
+ when the subject string contained newline characters. PCRE was assuming
+ anchoring for such patterns in all cases, which is not correct because .* will
+ not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
+ DOTALL is set at top level; otherwise it knows that patterns starting with .*
+ must be retried after every newline in the subject.
+ Version 2.04 18-Feb-99
+ ----------------------
+. For parenthesized subpatterns with repeats whose minimum was zero, the
+ computation of the store needed to hold the pattern was incorrect (too large).
+ If such patterns were nested a few deep, this could multiply and become a real
+ problem.
+. Added /M option to pcretest to show the memory requirement of a specific
+ pattern. Made -m a synonym of -s (which does this globally) for compatibility.
+. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
+ compiled in such a way that the backtracking after subsequent failure was
+ pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
+ ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
+ Version 2.03 02-Feb-99
+ ----------------------
+. Fixed typo and small mistake in man page.
+. Added 4th condition (GPL supersedes if conflict) and created separate
+ LICENCE file containing the conditions.
+. Updated pcretest so that patterns such as /abc\/def/ work like they do in
+ Perl, that is the internal \ allows the delimiter to be included in the
+ pattern. Locked out the use of \ as a delimiter. If \ immediately follows
+ the final delimiter, add \ to the end of the pattern (to test the error).
+. Added the convenience functions for extracting substrings after a successful
+ match. Updated pcretest to make it able to test these functions.
+ Version 2.02 14-Jan-99
+ ----------------------
+. Initialized the working variables associated with each extraction so that
+ their saving and restoring doesn't refer to uninitialized store.
+. Put dummy code into study.c in order to trick the optimizer of the IBM C
+ compiler for OS/2 into generating correct code. Apparently IBM isn't going to
+ fix the problem.
+. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
+ calls, and wasn't printing the correct value for compiling calls. Increased the
+ default value of LOOPREPEAT, and the number of significant figures in the
+ times.
+. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
+. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
+ a building problem on Windows NT with a FAT file system.
+ Version 2.01 21-Oct-98
+ ----------------------
+. Changed the API for pcre_compile() to allow for the provision of a pointer
+ to character tables built by pcre_maketables() in the current locale. If NULL
+ is passed, the default tables are used.
+ Version 2.00 24-Sep-98
+ ----------------------
+. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
+ it any more.
+. Allow quantification of (?>) groups, and make it work correctly.
+. The first character computation wasn't working for (?>) groups.
+. Correct the implementation of \Z (it is permitted to match on the \n at the
+ end of the subject) and add 5.005's \z, which really does match only at the
+ very end of the subject.
+. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
+. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
+ DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
+ localized options. All options to pcre_study() were also removed.
+. Add other new features from 5.005:
+    $(?<=           positive lookbehind
+    $(?<!           negative lookbehind
+    (?imsx-imsx)    added the unsetting capability
+                    such a setting is global if at outer level; local otherwise
+    (?imsx-imsx:)   non-capturing groups with option setting
+    (?(cond)re|re)  conditional pattern matching
+    A backreference to itself in a repeated group matches the previous
+    captured string.
+. General tidying up of studying (both automatic and via "study")
+ consequential on the addition of new assertions.
+. As in 5.005, unlimited repeated groups that could match an empty substring
+ are no longer faulted at compile time. Instead, the loop is forcibly broken at
+ runtime if any iteration does actually match an empty substring.
+. Include the RunTest script in the distribution.
+. Added tests from the Perl 5.005_02 distribution. This showed up a few
+ discrepancies, some of which were old and were also with respect to 5.004. They
+ have now been fixed.
+ Version 1.09 28-Apr-98
+ ----------------------
+. A negated single character class followed by a quantifier with a minimum
+ value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
+ program crashes, or just wrong answers. This did not apply to negated classes
+ containing more than one character, or to minima other than one.
+ Version 1.08 27-Mar-98
+ ----------------------
+. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
+. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
+ latter must appear before anything that relies on it in the pattern.
+ Version 1.07 16-Feb-98
+ ----------------------
+. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
+ repeat of a potentially empty string).
+ Version 1.06 23-Jan-98
+ ----------------------
+. Added Markus Oberhumer's little patches for C++.
+. Literal strings longer than 255 characters were broken.
+ Version 1.05 23-Dec-97
+ ----------------------
+. Negated character classes containing more than one character were failing if
+ PCRE_CASELESS was set at run time.
+ Version 1.04 19-Dec-97
+ ----------------------
+. Corrected the man page, where some "const" qualifiers had been omitted.
+. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
+ input syntax.
+. Fixed memory leak which occurred when a regex with back references was
+ matched with an offsets vector that wasn't big enough. The temporary memory
+ that is used in this case wasn't being freed if the match failed.
+. Tidied pcretest to ensure it frees memory that it gets.
+. Temporary memory was being obtained in the case where the passed offsets
+ vector was exactly big enough.
+. Corrected definition of offsetof() from change 5 below.
+. I had screwed up change 6 below and broken the rules for the use of
+ setjmp(). Now fixed.
  Version 1.03 18-Dec-97
  ----------------------
-Line 39 
 optimized code for single-character nega
+Line 515 
 optimized code for single-character nega
  from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
 . Constructs such as \d{8,} were compiling into the equivalent of
- \d{8}\d{65527} instead of \d{8}\d* which didn't make much difference to the
+ \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
  outcome, but in this particular case used more store than had been allocated,
  which caused the bug to be discovered because it threw up an internal error.

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