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revision 287 by ph10, Tue Dec 18 20:11:28 2007 UTC revision 389 by ph10, Sun Mar 15 18:24:05 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.5 12-Nov-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 127 when not in UTF-8 mode.
53    
54    12. Added the -M command line option to pcretest.
55    
56    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
57    
58    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
59    
60    
61    Version 7.8 05-Sep-08
62    ---------------------
63    
64    1.  Replaced UCP searching code with optimized version as implemented for Ad
65        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
66        stage table and inline lookup instead of a function, giving speed ups of 2
67        to 5 times on some simple patterns that I tested. Permission was given to
68        distribute the MultiStage2.py script that generates the tables (it's not in
69        the tarball, but is in the Subversion repository).
70    
71    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
72        scripts.
73    
74    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
75        a group with a zero qualifier. The result of the study could be incorrect,
76        or the function might crash, depending on the pattern.
77    
78    4.  Caseless matching was not working for non-ASCII characters in back
79        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
80        It now works when Unicode Property Support is available.
81    
82    5.  In pcretest, an escape such as \x{de} in the data was always generating
83        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
84        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
85        truncation.
86    
87    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
88    
89    7.  Added two (int) casts to pcregrep when printing the difference of two
90        pointers, in case they are 64-bit values.
91    
92    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
93        test 2 if it fails.
94    
95    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
96        and a #define of that name to empty if it is not externally set. This is to
97        allow users of MSVC to set it if necessary.
98    
99    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
100        the convenience functions in the pcre_get.c source file.
101    
102    11. An option change at the start of a pattern that had top-level alternatives
103        could cause overwriting and/or a crash. This command provoked a crash in
104        some environments:
105    
106          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
107    
108        This potential security problem was recorded as CVE-2008-2371.
109    
110    12. For a pattern where the match had to start at the beginning or immediately
111        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
112        pcre_dfa_exec() could read past the end of the passed subject if there was
113        no match. To help with detecting such bugs (e.g. with valgrind), I modified
114        pcretest so that it places the subject at the end of its malloc-ed buffer.
115    
116    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
117        exec() might read past the end of the data buffer in UTF-8 mode.
118    
119    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
120        the data contained the byte 0x85 as part of a UTF-8 character within its
121        first line. This applied both to normal and DFA matching.
122    
123    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
124        /^[^d]*?$/8 failed to match "abc".
125    
126    16. Added a missing copyright notice to pcrecpp_internal.h.
127    
128    17. Make it more clear in the documentation that values returned from
129        pcre_exec() in ovector are byte offsets, not character counts.
130    
131    18. Tidied a few places to stop certain compilers from issuing warnings.
132    
133    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
134        supplied by Stefan Weber. I made a further small update for 7.8 because
135        there is a change of source arrangements: the pcre_searchfuncs.c module is
136        replaced by pcre_ucd.c.
137    
138    
139    Version 7.7 07-May-08
140    ---------------------
141    
142    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
143        a string to a long long, pretend we don't even have a long long." This is
144        done by checking for the strtoq, strtoll, and _strtoi64 functions.
145    
146    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
147        pre-7.6 versions, which defined a global no_arg variable instead of putting
148        it in the RE class. (See also #8 below.)
149    
150    3.  Remove a line of dead code, identified by coverity and reported by Nuno
151        Lopes.
152    
153    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
154    
155        (1) The include/exclude patterns were being applied to the whole pathnames
156            of files, instead of just to the final components.
157    
158        (2) If there was more than one level of directory, the subdirectories were
159            skipped unless they satisfied the include/exclude conditions. This is
160            inconsistent with GNU grep (and could even be seen as contrary to the
161            pcregrep specification - which I improved to make it absolutely clear).
162            The action now is always to scan all levels of directory, and just
163            apply the include/exclude patterns to regular files.
164    
165    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
166        --exclude_dir in the tests to avoid scanning .svn directories.
167    
168    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
169        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
170        doesn't support NULs in patterns.
171    
172    7.  Added some missing "const"s to declarations of static tables in
173        pcre_compile.c and pcre_dfa_exec.c.
174    
175    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
176        caused by fix #2  above. (Subsequently also a second patch to fix the
177        first patch. And a third patch - this was a messy problem.)
178    
179    9.  Applied Craig's patch to remove the use of push_back().
180    
181    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
182        matching function regexec().
183    
184    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
185        which, however, unlike Perl's \g{...}, are subroutine calls, not back
186        references. PCRE supports relative numbers with this syntax (I don't think
187        Oniguruma does).
188    
189    12. Previously, a group with a zero repeat such as (...){0} was completely
190        omitted from the compiled regex. However, this means that if the group
191        was called as a subroutine from elsewhere in the pattern, things went wrong
192        (an internal error was given). Such groups are now left in the compiled
193        pattern, with a new opcode that causes them to be skipped at execution
194        time.
195    
196    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
197        to the way PCRE behaves:
198    
199        (a) A lone ] character is dis-allowed (Perl treats it as data).
200    
201        (b) A back reference to an unmatched subpattern matches an empty string
202            (Perl fails the current match path).
203    
204        (c) A data ] in a character class must be notated as \] because if the
205            first data character in a class is ], it defines an empty class. (In
206            Perl it is not possible to have an empty class.) The empty class []
207            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
208            The negative empty class [^] matches any one character, independently
209            of the DOTALL setting.
210    
211    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
212        non-existent subpattern following a character class starting with ']' and
213        containing () gave an internal compiling error instead of "reference to
214        non-existent subpattern". Fortunately, when the pattern did exist, the
215        compiled code was correct. (When scanning forwards to check for the
216        existencd of the subpattern, it was treating the data ']' as terminating
217        the class, so got the count wrong. When actually compiling, the reference
218        was subsequently set up correctly.)
219    
220    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
221        it was being rejected as not supported by pcre_dfa_exec(), even though
222        other assertions are supported. I have made pcre_dfa_exec() support
223        (*FAIL).
224    
225    16. The implementation of 13c above involved the invention of a new opcode,
226        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
227        cannot be changed at match time, I realized I could make a small
228        improvement to matching performance by compiling OP_ALLANY instead of
229        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
230        on the OP_ANY path.
231    
232    17. Compiling pcretest on Windows with readline support failed without the
233        following two fixes: (1) Make the unistd.h include conditional on
234        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
235    
236    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
237        ncurses library to be included for pcretest when ReadLine support is
238        requested, but also to allow for it to be overridden. This patch came from
239        Daniel Bergström.
240    
241    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
242        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
243        any errors with the current Unicode tables. Thanks to Peter Kankowski for
244        spotting this.
245    
246    
247    Version 7.6 28-Jan-08
248    ---------------------
249    
250    1.  A character class containing a very large number of characters with
251        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
252        overflow.
253    
254    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
255        HAVE_LONG_LONG is not defined.
256    
257    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
258        bring them up to date and include new features. This patch includes:
259    
260        - Fixed PH's badly added libz and libbz2 support.
261        - Fixed a problem with static linking.
262        - Added pcredemo. [But later removed - see 7 below.]
263        - Fixed dftables problem and added an option.
264        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
265            HAVE_LONG_LONG.
266        - Added readline support for pcretest.
267        - Added an listing of the option settings after cmake has run.
268    
269    4.  A user submitted a patch to Makefile that makes it easy to create
270        "pcre.dll" under mingw when using Configure/Make. I added stuff to
271        Makefile.am that cause it to include this special target, without
272        affecting anything else. Note that the same mingw target plus all
273        the other distribution libraries and programs are now supported
274        when configuring with CMake (see 6 below) instead of with
275        Configure/Make.
276    
277    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
278        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
279        exported in the Windows port". It has not yet been confirmed that the patch
280        solves the problem, but it does no harm.
281    
282    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
283        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
284        with CMake, and also correct the comment about stack recursion.
285    
286    7.  Remove the automatic building of pcredemo from the ./configure system and
287        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
288        of a program that users should build themselves after PCRE is installed, so
289        building it automatically is not really right. What is more, it gave
290        trouble in some build environments.
291    
292    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
293    
294    
295    Version 7.5 10-Jan-08
296  ---------------------  ---------------------
297    
298  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 76  Version 7.5 12-Nov-07 Line 367  Version 7.5 12-Nov-07
367      does the same. The return code can be used to tell if there were any      does the same. The return code can be used to tell if there were any
368      non-matching lines.      non-matching lines.
369    
370  14. The pattern (?=something)(?R) was not being diagnosed as a potentially  14. Added --file-offsets and --line-offsets to pcregrep.
371    
372    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
373      infinitely looping recursion. The bug was that positive lookaheads were not      infinitely looping recursion. The bug was that positive lookaheads were not
374      being skipped when checking for a possible empty match (negative lookaheads      being skipped when checking for a possible empty match (negative lookaheads
375      and both kinds of lookbehind were skipped).      and both kinds of lookbehind were skipped).
376    
377  15. Fixed two typos in the Windows-only code in pcregrep.c, and moved the  16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
378      inclusion of <windows.h> to before rather than after the definition of      inclusion of <windows.h> to before rather than after the definition of
379      INVALID_FILE_ATTRIBUTES (patch from David Byron).      INVALID_FILE_ATTRIBUTES (patch from David Byron).
380    
381  16. Specifying a possessive quantifier with a specific limit for a Unicode  17. Specifying a possessive quantifier with a specific limit for a Unicode
382      character property caused pcre_compile() to compile bad code, which led at      character property caused pcre_compile() to compile bad code, which led at
383      runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this      runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
384      are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that      are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
385      caused the error; without that there was no problem.      caused the error; without that there was no problem.
386    
387  17. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.  18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
388    
389    19. Added --enable-pcretest-libreadline.
390    
391    20. In pcrecpp.cc, the variable 'count' was incremented twice in
392        RE::GlobalReplace(). As a result, the number of replacements returned was
393        double what it should be. I removed one of the increments, but Craig sent a
394        later patch that removed the other one (the right fix) and added unit tests
395        that check the return values (which was not done before).
396    
397    21. Several CMake things:
398    
399        (1) Arranged that, when cmake is used on Unix, the libraries end up with
400            the names libpcre and libpcreposix, not just pcre and pcreposix.
401    
402        (2) The above change means that pcretest and pcregrep are now correctly
403            linked with the newly-built libraries, not previously installed ones.
404    
405        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
406    
407    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
408        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
409        UTF-8 newline character). The key issue is that the pattern starts .*;
410        this means that the match must be either at the beginning, or after a
411        newline. The bug was in the code for advancing after a failed match and
412        checking that the new position followed a newline. It was not taking
413        account of UTF-8 characters correctly.
414    
415    23. PCRE was behaving differently from Perl in the way it recognized POSIX
416        character classes. PCRE was not treating the sequence [:...:] as a
417        character class unless the ... were all letters. Perl, however, seems to
418        allow any characters between [: and :], though of course it rejects as
419        unknown any "names" that contain non-letters, because all the known class
420        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
421        for example, whereas PCRE did not - it did not recognize a POSIX character
422        class. This seemed a bit dangerous, so the code has been changed to be
423        closer to Perl. The behaviour is not identical to Perl, because PCRE will
424        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
425        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
426        Perl does, and where it didn't before.
427    
428  18. Added --enable-pcretest-libreadline.  24. Rewrite so as to remove the single use of %n from pcregrep because in some
429        Windows environments %n is disabled by default.
430    
431    
432  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07

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