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revision 300 by ph10, Mon Jan 14 19:43:19 2008 UTC revision 349 by ph10, Wed Jul 2 18:42:11 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.6 14-Jan-08  Version 8.0 02 Jul-08
5  ---------------------  ---------------------
6    
7  1.  A class with a very large number of characters with codepoints greater  1.  Replaced UCP searching code with optimized version as implemented for Ad
8      than 255 (in UTF-8 mode, of course), caused a buffer overflow.      Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
9        stage table and inline lookup instead of a function, giving speed ups of 2
10        to 5 times on some simple patterns that I tested. Permission was given to
11        distribute the MultiStage2.py script that generates the tables (it's not in
12        the tarball, but is in the Subversion repository).
13    
14    
15    Version 7.7 07-May-08
16    ---------------------
17    
18    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
19        a string to a long long, pretend we don't even have a long long." This is
20        done by checking for the strtoq, strtoll, and _strtoi64 functions.
21    
22    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
23        pre-7.6 versions, which defined a global no_arg variable instead of putting
24        it in the RE class. (See also #8 below.)
25    
26    3.  Remove a line of dead code, identified by coverity and reported by Nuno
27        Lopes.
28    
29    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
30    
31        (1) The include/exclude patterns were being applied to the whole pathnames
32            of files, instead of just to the final components.
33    
34        (2) If there was more than one level of directory, the subdirectories were
35            skipped unless they satisfied the include/exclude conditions. This is
36            inconsistent with GNU grep (and could even be seen as contrary to the
37            pcregrep specification - which I improved to make it absolutely clear).
38            The action now is always to scan all levels of directory, and just
39            apply the include/exclude patterns to regular files.
40    
41    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
42        --exclude_dir in the tests to avoid scanning .svn directories.
43    
44    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
45        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
46        doesn't support NULs in patterns.
47    
48    7.  Added some missing "const"s to declarations of static tables in
49        pcre_compile.c and pcre_dfa_exec.c.
50    
51    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
52        caused by fix #2  above. (Subsequently also a second patch to fix the
53        first patch. And a third patch - this was a messy problem.)
54    
55    9.  Applied Craig's patch to remove the use of push_back().
56    
57    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
58        matching function regexec().
59    
60    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
61        which, however, unlike Perl's \g{...}, are subroutine calls, not back
62        references. PCRE supports relative numbers with this syntax (I don't think
63        Oniguruma does).
64    
65    12. Previously, a group with a zero repeat such as (...){0} was completely
66        omitted from the compiled regex. However, this means that if the group
67        was called as a subroutine from elsewhere in the pattern, things went wrong
68        (an internal error was given). Such groups are now left in the compiled
69        pattern, with a new opcode that causes them to be skipped at execution
70        time.
71    
72    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
73        to the way PCRE behaves:
74    
75        (a) A lone ] character is dis-allowed (Perl treats it as data).
76    
77        (b) A back reference to an unmatched subpattern matches an empty string
78            (Perl fails the current match path).
79    
80        (c) A data ] in a character class must be notated as \] because if the
81            first data character in a class is ], it defines an empty class. (In
82            Perl it is not possible to have an empty class.) The empty class []
83            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
84            The negative empty class [^] matches any one character, independently
85            of the DOTALL setting.
86    
87    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
88        non-existent subpattern following a character class starting with ']' and
89        containing () gave an internal compiling error instead of "reference to
90        non-existent subpattern". Fortunately, when the pattern did exist, the
91        compiled code was correct. (When scanning forwards to check for the
92        existencd of the subpattern, it was treating the data ']' as terminating
93        the class, so got the count wrong. When actually compiling, the reference
94        was subsequently set up correctly.)
95    
96    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
97        it was being rejected as not supported by pcre_dfa_exec(), even though
98        other assertions are supported. I have made pcre_dfa_exec() support
99        (*FAIL).
100    
101    16. The implementation of 13c above involved the invention of a new opcode,
102        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
103        cannot be changed at match time, I realized I could make a small
104        improvement to matching performance by compiling OP_ALLANY instead of
105        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
106        on the OP_ANY path.
107    
108    17. Compiling pcretest on Windows with readline support failed without the
109        following two fixes: (1) Make the unistd.h include conditional on
110        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
111    
112    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
113        ncurses library to be included for pcretest when ReadLine support is
114        requested, but also to allow for it to be overridden. This patch came from
115        Daniel Bergström.
116    
117    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
118        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
119        any errors with the current Unicode tables. Thanks to Peter Kankowski for
120        spotting this.
121    
122    
123    Version 7.6 28-Jan-08
124    ---------------------
125    
126    1.  A character class containing a very large number of characters with
127        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
128        overflow.
129    
130    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
131        HAVE_LONG_LONG is not defined.
132    
133    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
134        bring them up to date and include new features. This patch includes:
135    
136        - Fixed PH's badly added libz and libbz2 support.
137        - Fixed a problem with static linking.
138        - Added pcredemo. [But later removed - see 7 below.]
139        - Fixed dftables problem and added an option.
140        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
141            HAVE_LONG_LONG.
142        - Added readline support for pcretest.
143        - Added an listing of the option settings after cmake has run.
144    
145    4.  A user submitted a patch to Makefile that makes it easy to create
146        "pcre.dll" under mingw when using Configure/Make. I added stuff to
147        Makefile.am that cause it to include this special target, without
148        affecting anything else. Note that the same mingw target plus all
149        the other distribution libraries and programs are now supported
150        when configuring with CMake (see 6 below) instead of with
151        Configure/Make.
152    
153    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
154        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
155        exported in the Windows port". It has not yet been confirmed that the patch
156        solves the problem, but it does no harm.
157    
158    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
159        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
160        with CMake, and also correct the comment about stack recursion.
161    
162    7.  Remove the automatic building of pcredemo from the ./configure system and
163        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
164        of a program that users should build themselves after PCRE is installed, so
165        building it automatically is not really right. What is more, it gave
166        trouble in some build environments.
167    
168    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
169    
170    
171  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
172  ---------------------  ---------------------

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