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revision 292 by ph10, Thu Dec 27 09:27:23 2007 UTC revision 384 by ph10, Sun Mar 8 16:27:43 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.5 27-Dec-07  Version 7.9 xx-xxx-09
5    ---------------------
6    
7    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
8        (pcretest), all targets were linked against these libraries. This included
9        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
10        libraries. This caused unwanted dependencies to be created. This problem
11        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
12        pcretest is linked with readline.
13    
14    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
15        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
16        moved outside it again, because FALSE and TRUE are already defined in AIX,
17        but BOOL is not.
18    
19    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
20        PCRE_MATCH_LIMIT_RETURSION values as ints, when they should be long ints.
21    
22    4.  The pcregrep documentation said spaces were inserted as well as colons (or
23        hyphens) following file names and line numbers when outputting matching
24        lines. This is not true; no spaces are inserted. I have also clarified the
25        wording for the --colour (or --color) option.
26    
27    5.  In pcregrep, when --colour was used with -o, the list of matching strings
28        was not coloured; this is different to GNU grep, so I have changed it to be
29        the same.
30    
31    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
32        each matching line was coloured. Now it goes on to look for further matches
33        of any of the test patterns, which is the same behaviour as GNU grep.
34    
35    7.  A pattern that could match an empty string could cause pcregrep to loop; it
36        doesn't make sense to accept an empty string match in pcregrep, so I have
37        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
38        seems to be how GNU grep behaves.
39    
40    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
41        start or after a newline", because the conditional assertion was not being
42        correctly handled. The rule now is that both the assertion and what follows
43        in the first alternative must satisfy the test.
44    
45    9.  If auto-callout was enabled in a pattern with a conditional group, PCRE
46        could crash during matching.
47    
48    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
49        used for matching.
50    
51    11. Unicode property support in character classes was not working for
52        characters (bytes) greater than 128 when not in UTF-8 mode.
53    
54    
55    Version 7.8 05-Sep-08
56    ---------------------
57    
58    1.  Replaced UCP searching code with optimized version as implemented for Ad
59        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
60        stage table and inline lookup instead of a function, giving speed ups of 2
61        to 5 times on some simple patterns that I tested. Permission was given to
62        distribute the MultiStage2.py script that generates the tables (it's not in
63        the tarball, but is in the Subversion repository).
64    
65    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
66        scripts.
67    
68    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
69        a group with a zero qualifier. The result of the study could be incorrect,
70        or the function might crash, depending on the pattern.
71    
72    4.  Caseless matching was not working for non-ASCII characters in back
73        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
74        It now works when Unicode Property Support is available.
75    
76    5.  In pcretest, an escape such as \x{de} in the data was always generating
77        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
78        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
79        truncation.
80    
81    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
82    
83    7.  Added two (int) casts to pcregrep when printing the difference of two
84        pointers, in case they are 64-bit values.
85    
86    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
87        test 2 if it fails.
88    
89    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
90        and a #define of that name to empty if it is not externally set. This is to
91        allow users of MSVC to set it if necessary.
92    
93    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
94        the convenience functions in the pcre_get.c source file.
95    
96    11. An option change at the start of a pattern that had top-level alternatives
97        could cause overwriting and/or a crash. This command provoked a crash in
98        some environments:
99    
100          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
101    
102        This potential security problem was recorded as CVE-2008-2371.
103    
104    12. For a pattern where the match had to start at the beginning or immediately
105        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
106        pcre_dfa_exec() could read past the end of the passed subject if there was
107        no match. To help with detecting such bugs (e.g. with valgrind), I modified
108        pcretest so that it places the subject at the end of its malloc-ed buffer.
109    
110    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
111        exec() might read past the end of the data buffer in UTF-8 mode.
112    
113    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
114        the data contained the byte 0x85 as part of a UTF-8 character within its
115        first line. This applied both to normal and DFA matching.
116    
117    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
118        /^[^d]*?$/8 failed to match "abc".
119    
120    16. Added a missing copyright notice to pcrecpp_internal.h.
121    
122    17. Make it more clear in the documentation that values returned from
123        pcre_exec() in ovector are byte offsets, not character counts.
124    
125    18. Tidied a few places to stop certain compilers from issuing warnings.
126    
127    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
128        supplied by Stefan Weber. I made a further small update for 7.8 because
129        there is a change of source arrangements: the pcre_searchfuncs.c module is
130        replaced by pcre_ucd.c.
131    
132    
133    Version 7.7 07-May-08
134    ---------------------
135    
136    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
137        a string to a long long, pretend we don't even have a long long." This is
138        done by checking for the strtoq, strtoll, and _strtoi64 functions.
139    
140    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
141        pre-7.6 versions, which defined a global no_arg variable instead of putting
142        it in the RE class. (See also #8 below.)
143    
144    3.  Remove a line of dead code, identified by coverity and reported by Nuno
145        Lopes.
146    
147    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
148    
149        (1) The include/exclude patterns were being applied to the whole pathnames
150            of files, instead of just to the final components.
151    
152        (2) If there was more than one level of directory, the subdirectories were
153            skipped unless they satisfied the include/exclude conditions. This is
154            inconsistent with GNU grep (and could even be seen as contrary to the
155            pcregrep specification - which I improved to make it absolutely clear).
156            The action now is always to scan all levels of directory, and just
157            apply the include/exclude patterns to regular files.
158    
159    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
160        --exclude_dir in the tests to avoid scanning .svn directories.
161    
162    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
163        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
164        doesn't support NULs in patterns.
165    
166    7.  Added some missing "const"s to declarations of static tables in
167        pcre_compile.c and pcre_dfa_exec.c.
168    
169    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
170        caused by fix #2  above. (Subsequently also a second patch to fix the
171        first patch. And a third patch - this was a messy problem.)
172    
173    9.  Applied Craig's patch to remove the use of push_back().
174    
175    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
176        matching function regexec().
177    
178    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
179        which, however, unlike Perl's \g{...}, are subroutine calls, not back
180        references. PCRE supports relative numbers with this syntax (I don't think
181        Oniguruma does).
182    
183    12. Previously, a group with a zero repeat such as (...){0} was completely
184        omitted from the compiled regex. However, this means that if the group
185        was called as a subroutine from elsewhere in the pattern, things went wrong
186        (an internal error was given). Such groups are now left in the compiled
187        pattern, with a new opcode that causes them to be skipped at execution
188        time.
189    
190    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
191        to the way PCRE behaves:
192    
193        (a) A lone ] character is dis-allowed (Perl treats it as data).
194    
195        (b) A back reference to an unmatched subpattern matches an empty string
196            (Perl fails the current match path).
197    
198        (c) A data ] in a character class must be notated as \] because if the
199            first data character in a class is ], it defines an empty class. (In
200            Perl it is not possible to have an empty class.) The empty class []
201            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
202            The negative empty class [^] matches any one character, independently
203            of the DOTALL setting.
204    
205    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
206        non-existent subpattern following a character class starting with ']' and
207        containing () gave an internal compiling error instead of "reference to
208        non-existent subpattern". Fortunately, when the pattern did exist, the
209        compiled code was correct. (When scanning forwards to check for the
210        existencd of the subpattern, it was treating the data ']' as terminating
211        the class, so got the count wrong. When actually compiling, the reference
212        was subsequently set up correctly.)
213    
214    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
215        it was being rejected as not supported by pcre_dfa_exec(), even though
216        other assertions are supported. I have made pcre_dfa_exec() support
217        (*FAIL).
218    
219    16. The implementation of 13c above involved the invention of a new opcode,
220        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
221        cannot be changed at match time, I realized I could make a small
222        improvement to matching performance by compiling OP_ALLANY instead of
223        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
224        on the OP_ANY path.
225    
226    17. Compiling pcretest on Windows with readline support failed without the
227        following two fixes: (1) Make the unistd.h include conditional on
228        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
229    
230    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
231        ncurses library to be included for pcretest when ReadLine support is
232        requested, but also to allow for it to be overridden. This patch came from
233        Daniel Bergström.
234    
235    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
236        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
237        any errors with the current Unicode tables. Thanks to Peter Kankowski for
238        spotting this.
239    
240    
241    Version 7.6 28-Jan-08
242    ---------------------
243    
244    1.  A character class containing a very large number of characters with
245        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
246        overflow.
247    
248    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
249        HAVE_LONG_LONG is not defined.
250    
251    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
252        bring them up to date and include new features. This patch includes:
253    
254        - Fixed PH's badly added libz and libbz2 support.
255        - Fixed a problem with static linking.
256        - Added pcredemo. [But later removed - see 7 below.]
257        - Fixed dftables problem and added an option.
258        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
259            HAVE_LONG_LONG.
260        - Added readline support for pcretest.
261        - Added an listing of the option settings after cmake has run.
262    
263    4.  A user submitted a patch to Makefile that makes it easy to create
264        "pcre.dll" under mingw when using Configure/Make. I added stuff to
265        Makefile.am that cause it to include this special target, without
266        affecting anything else. Note that the same mingw target plus all
267        the other distribution libraries and programs are now supported
268        when configuring with CMake (see 6 below) instead of with
269        Configure/Make.
270    
271    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
272        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
273        exported in the Windows port". It has not yet been confirmed that the patch
274        solves the problem, but it does no harm.
275    
276    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
277        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
278        with CMake, and also correct the comment about stack recursion.
279    
280    7.  Remove the automatic building of pcredemo from the ./configure system and
281        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
282        of a program that users should build themselves after PCRE is installed, so
283        building it automatically is not really right. What is more, it gave
284        trouble in some build environments.
285    
286    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
287    
288    
289    Version 7.5 10-Jan-08
290  ---------------------  ---------------------
291    
292  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
# Line 99  Version 7.5 27-Dec-07 Line 384  Version 7.5 27-Dec-07
384    
385  20. In pcrecpp.cc, the variable 'count' was incremented twice in  20. In pcrecpp.cc, the variable 'count' was incremented twice in
386      RE::GlobalReplace(). As a result, the number of replacements returned was      RE::GlobalReplace(). As a result, the number of replacements returned was
387      double what it should be. I have removed one of the increments.      double what it should be. I removed one of the increments, but Craig sent a
388        later patch that removed the other one (the right fix) and added unit tests
389        that check the return values (which was not done before).
390    
391  21. Several CMake things:  21. Several CMake things:
392    
# Line 111  Version 7.5 27-Dec-07 Line 398  Version 7.5 27-Dec-07
398    
399      (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.      (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
400    
401    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
402        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
403        UTF-8 newline character). The key issue is that the pattern starts .*;
404        this means that the match must be either at the beginning, or after a
405        newline. The bug was in the code for advancing after a failed match and
406        checking that the new position followed a newline. It was not taking
407        account of UTF-8 characters correctly.
408    
409    23. PCRE was behaving differently from Perl in the way it recognized POSIX
410        character classes. PCRE was not treating the sequence [:...:] as a
411        character class unless the ... were all letters. Perl, however, seems to
412        allow any characters between [: and :], though of course it rejects as
413        unknown any "names" that contain non-letters, because all the known class
414        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
415        for example, whereas PCRE did not - it did not recognize a POSIX character
416        class. This seemed a bit dangerous, so the code has been changed to be
417        closer to Perl. The behaviour is not identical to Perl, because PCRE will
418        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
419        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
420        Perl does, and where it didn't before.
421    
422    24. Rewrite so as to remove the single use of %n from pcregrep because in some
423        Windows environments %n is disabled by default.
424    
425    
426  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07
427  ---------------------  ---------------------

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