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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.6 19-Jan-08  Version 8.00 ??-???-??
5    ----------------------
6    
7    1.  The table for translating pcre_compile() error codes into POSIX error codes
8        was out-of-date, and there was no check on the pcre_compile() error code
9        being within the table. This could lead to an OK return being given in
10        error.
11    
12    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
13        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
14        in a Windows environment.
15    
16    3.  The pcregrep --count option prints the count for each file even when it is
17        zero, as does GNU grep. However, pcregrep was also printing all files when
18        --files-with-matches was added. Now, when both options are given, it prints
19        counts only for those files that have at least one match. (GNU grep just
20        prints the file name in this circumstance, but including the count seems
21        more useful - otherwise, why use --count?) Also ensured that the
22        combination -clh just lists non-zero counts, with no names.
23    
24    4.  The long form of the pcregrep -F option was incorrectly implemented as
25        --fixed_strings instead of --fixed-strings. This is an incompatible change,
26        but it seems right to fix it, and I didn't think it was worth preserving
27        the old behaviour.
28    
29    5.  The command line items --regex=pattern and --regexp=pattern were not
30        recognized by pcregrep, which required --regex pattern or --regexp pattern
31        (with a space rather than an '='). The man page documented the '=' forms,
32        which are compatible with GNU grep; these now work.
33    
34    6.  No libpcreposix.pc file was created for pkg-config; there was just
35        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
36    
37    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
38        when UCP support is not needed, by modifying the Python script that
39        generates it from Unicode data files. This should not matter if the module
40        is correctly used as a library, but I received one complaint about 50K of
41        unwanted data. My guess is that the person linked everything into his
42        program rather than using a library. Anyway, it does no harm.
43    
44    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
45        was a minimum greater than 1 for a wide character in a possessive
46        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
47        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
48        character. Chaos in the form of incorrect output or a compiling loop could
49        result.
50    
51    9.  The restrictions on what a pattern can contain when partial matching is
52        requested for pcre_exec() have been removed. All patterns can now be
53        partially matched by this function. In addition, if there are at least two
54        slots in the offset vector, the offset of the earliest inspected character
55        for the match and the offset of the end of the subject are set in them when
56        PCRE_ERROR_PARTIAL is returned.
57    
58    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
59        synonymous with PCRE_PARTIAL, for backwards compatibility, and
60        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
61        and may be more useful for multi-segment matching, especially with
62        pcre_exec().
63    
64    11. Partial matching with pcre_exec() is now more intuitive. A partial match
65        used to be given if ever the end of the subject was reached; now it is
66        given only if matching could not proceed because another character was
67        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
68        string "Z", which now yields "no match" instead of "partial match". In the
69        case of pcre_dfa_exec(), "no match" is given if every matching path for the
70        final character ended with (*FAIL).
71    
72    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
73        if the pattern had a "must contain" character that was already found in the
74        earlier partial match, unless partial matching was again requested. For
75        example, with the pattern /dog.(body)?/, the "must contain" character is
76        "g". If the first part-match was for the string "dog", restarting with
77        "sbody" failed. This bug has been fixed.
78    
79    13. The string returned by pcre_dfa_exec() after a partial match has been
80        changed so that it starts at the first inspected character rather than the
81        first character of the match. This makes a difference only if the pattern
82        starts with a lookbehind assertion or \b or \B (\K is not supported by
83        pcre_dfa_exec()). It's an incompatible change, but it makes the two
84        matching functions compatible, and I think it's the right thing to do.
85    
86    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
87        so that the demonstration program is easily available in environments where
88        PCRE has not been installed from source.
89    
90    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
91        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
92        library.
93    
94    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
95        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
96        is not the first non-POSIX option to be added. Clearly some people find
97        these options useful.
98    
99    17. If a caller to the POSIX matching function regexec() passes a non-zero
100        value for nmatch with a NULL value for pmatch, the value of
101        nmatch is forced to zero.
102    
103    18. RunGrepTest did not have a test for the availability of the -u option of
104        the diff command, as RunTest does. It now checks in the same way as
105        RunTest, and also checks for the -b option.
106    
107    19. If an odd number of negated classes containing just a single character
108        interposed, within parentheses, between a forward reference to a named
109        subpattern and the definition of the subpattern, compilation crashed with
110        an internal error, complaining that it could not find the referenced
111        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
112        [The bug was that it was starting one character too far in when skipping
113        over the character class, thus treating the ] as data rather than
114        terminating the class. This meant it could skip too much.]
115    
116    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
117        /g option in pcretest when the pattern contains \K, which makes it possible
118        to have an empty string match not at the start, even when the pattern is
119        anchored. Updated pcretest and pcredemo to use this option.
120    
121    21. If the maximum number of capturing subpatterns in a recursion was greater
122        than the maximum at the outer level, the higher number was returned, but
123        with unset values at the outer level. The correct (outer level) value is
124        now given.
125    
126    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
127        PCRE did not set those parentheses (unlike Perl). I have now found a way to
128        make it do so. The string so far is captured, making this feature
129        compatible with Perl.
130    
131    23. The tests have been re-organized, adding tests 11 and 12, to make it
132        possible to check the Perl 5.10 features against Perl 5.10.
133    
134    
135    Version 7.9 11-Apr-09
136    ---------------------
137    
138    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
139        (pcretest), all targets were linked against these libraries. This included
140        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
141        libraries. This caused unwanted dependencies to be created. This problem
142        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
143        pcretest is linked with readline.
144    
145    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
146        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
147        moved outside it again, because FALSE and TRUE are already defined in AIX,
148        but BOOL is not.
149    
150    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
151        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
152    
153    4.  The pcregrep documentation said spaces were inserted as well as colons (or
154        hyphens) following file names and line numbers when outputting matching
155        lines. This is not true; no spaces are inserted. I have also clarified the
156        wording for the --colour (or --color) option.
157    
158    5.  In pcregrep, when --colour was used with -o, the list of matching strings
159        was not coloured; this is different to GNU grep, so I have changed it to be
160        the same.
161    
162    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
163        each matching line was coloured. Now it goes on to look for further matches
164        of any of the test patterns, which is the same behaviour as GNU grep.
165    
166    7.  A pattern that could match an empty string could cause pcregrep to loop; it
167        doesn't make sense to accept an empty string match in pcregrep, so I have
168        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
169        seems to be how GNU grep behaves.
170    
171    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
172        start or after a newline", because the conditional assertion was not being
173        correctly handled. The rule now is that both the assertion and what follows
174        in the first alternative must satisfy the test.
175    
176    9.  If auto-callout was enabled in a pattern with a conditional group whose
177        condition was an assertion, PCRE could crash during matching, both with
178        pcre_exec() and pcre_dfa_exec().
179    
180    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
181        used for matching.
182    
183    11. Unicode property support in character classes was not working for
184        characters (bytes) greater than 127 when not in UTF-8 mode.
185    
186    12. Added the -M command line option to pcretest.
187    
188    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
189    
190    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
191    
192    16. Added comments and documentation about mis-use of no_arg in the C++
193        wrapper.
194    
195    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
196        from Martin Jerabek that uses macro names for all relevant character and
197        string constants.
198    
199    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
200        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
201        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
202        these, but not everybody uses configure.
203    
204    19. A conditional group that had only one branch was not being correctly
205        recognized as an item that could match an empty string. This meant that an
206        enclosing group might also not be so recognized, causing infinite looping
207        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
208        with the subject "ab", where knowledge that the repeated group can match
209        nothing is needed in order to break the loop.
210    
211    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
212        exec(), but without supplying a callout function, matching went wrong.
213    
214    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
215        leak if the size of the offset vector was greater than 30. When the vector
216        is smaller, the saved offsets during recursion go onto a local stack
217        vector, but for larger vectors malloc() is used. It was failing to free
218        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
219        error, in fact).
220    
221    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
222        heapframe that is used only when UTF-8 support is enabled. This caused no
223        problem, but was untidy.
224    
225    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
226        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
227        included within another project.
228    
229    24. Steven Van Ingelgem's patches to add more options to the CMake support,
230        slightly modified by me:
231    
232          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
233              not building pcregrep.
234    
235          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
236              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
237    
238    25. Forward references, both numeric and by name, in patterns that made use of
239        duplicate group numbers, could behave incorrectly or give incorrect errors,
240        because when scanning forward to find the reference group, PCRE was not
241        taking into account the duplicate group numbers. A pattern such as
242        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
243    
244    26. Changed a few more instances of "const unsigned char *" to USPTR, making
245        the feature of a custom pointer more persuasive (as requested by a user).
246    
247    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
248        pcretest.c, inside #ifndefs, because it seems they are sometimes already
249        pre-defined.
250    
251    28. Added support for (*UTF8) at the start of a pattern.
252    
253    29. Arrange for flags added by the "release type" setting in CMake to be shown
254        in the configuration summary.
255    
256    
257    Version 7.8 05-Sep-08
258    ---------------------
259    
260    1.  Replaced UCP searching code with optimized version as implemented for Ad
261        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
262        stage table and inline lookup instead of a function, giving speed ups of 2
263        to 5 times on some simple patterns that I tested. Permission was given to
264        distribute the MultiStage2.py script that generates the tables (it's not in
265        the tarball, but is in the Subversion repository).
266    
267    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
268        scripts.
269    
270    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
271        a group with a zero qualifier. The result of the study could be incorrect,
272        or the function might crash, depending on the pattern.
273    
274    4.  Caseless matching was not working for non-ASCII characters in back
275        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
276        It now works when Unicode Property Support is available.
277    
278    5.  In pcretest, an escape such as \x{de} in the data was always generating
279        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
280        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
281        truncation.
282    
283    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
284    
285    7.  Added two (int) casts to pcregrep when printing the difference of two
286        pointers, in case they are 64-bit values.
287    
288    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
289        test 2 if it fails.
290    
291    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
292        and a #define of that name to empty if it is not externally set. This is to
293        allow users of MSVC to set it if necessary.
294    
295    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
296        the convenience functions in the pcre_get.c source file.
297    
298    11. An option change at the start of a pattern that had top-level alternatives
299        could cause overwriting and/or a crash. This command provoked a crash in
300        some environments:
301    
302          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
303    
304        This potential security problem was recorded as CVE-2008-2371.
305    
306    12. For a pattern where the match had to start at the beginning or immediately
307        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
308        pcre_dfa_exec() could read past the end of the passed subject if there was
309        no match. To help with detecting such bugs (e.g. with valgrind), I modified
310        pcretest so that it places the subject at the end of its malloc-ed buffer.
311    
312    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
313        exec() might read past the end of the data buffer in UTF-8 mode.
314    
315    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
316        the data contained the byte 0x85 as part of a UTF-8 character within its
317        first line. This applied both to normal and DFA matching.
318    
319    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
320        /^[^d]*?$/8 failed to match "abc".
321    
322    16. Added a missing copyright notice to pcrecpp_internal.h.
323    
324    17. Make it more clear in the documentation that values returned from
325        pcre_exec() in ovector are byte offsets, not character counts.
326    
327    18. Tidied a few places to stop certain compilers from issuing warnings.
328    
329    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
330        supplied by Stefan Weber. I made a further small update for 7.8 because
331        there is a change of source arrangements: the pcre_searchfuncs.c module is
332        replaced by pcre_ucd.c.
333    
334    
335    Version 7.7 07-May-08
336    ---------------------
337    
338    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
339        a string to a long long, pretend we don't even have a long long." This is
340        done by checking for the strtoq, strtoll, and _strtoi64 functions.
341    
342    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
343        pre-7.6 versions, which defined a global no_arg variable instead of putting
344        it in the RE class. (See also #8 below.)
345    
346    3.  Remove a line of dead code, identified by coverity and reported by Nuno
347        Lopes.
348    
349    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
350    
351        (1) The include/exclude patterns were being applied to the whole pathnames
352            of files, instead of just to the final components.
353    
354        (2) If there was more than one level of directory, the subdirectories were
355            skipped unless they satisfied the include/exclude conditions. This is
356            inconsistent with GNU grep (and could even be seen as contrary to the
357            pcregrep specification - which I improved to make it absolutely clear).
358            The action now is always to scan all levels of directory, and just
359            apply the include/exclude patterns to regular files.
360    
361    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
362        --exclude_dir in the tests to avoid scanning .svn directories.
363    
364    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
365        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
366        doesn't support NULs in patterns.
367    
368    7.  Added some missing "const"s to declarations of static tables in
369        pcre_compile.c and pcre_dfa_exec.c.
370    
371    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
372        caused by fix #2  above. (Subsequently also a second patch to fix the
373        first patch. And a third patch - this was a messy problem.)
374    
375    9.  Applied Craig's patch to remove the use of push_back().
376    
377    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
378        matching function regexec().
379    
380    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
381        which, however, unlike Perl's \g{...}, are subroutine calls, not back
382        references. PCRE supports relative numbers with this syntax (I don't think
383        Oniguruma does).
384    
385    12. Previously, a group with a zero repeat such as (...){0} was completely
386        omitted from the compiled regex. However, this means that if the group
387        was called as a subroutine from elsewhere in the pattern, things went wrong
388        (an internal error was given). Such groups are now left in the compiled
389        pattern, with a new opcode that causes them to be skipped at execution
390        time.
391    
392    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
393        to the way PCRE behaves:
394    
395        (a) A lone ] character is dis-allowed (Perl treats it as data).
396    
397        (b) A back reference to an unmatched subpattern matches an empty string
398            (Perl fails the current match path).
399    
400        (c) A data ] in a character class must be notated as \] because if the
401            first data character in a class is ], it defines an empty class. (In
402            Perl it is not possible to have an empty class.) The empty class []
403            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
404            The negative empty class [^] matches any one character, independently
405            of the DOTALL setting.
406    
407    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
408        non-existent subpattern following a character class starting with ']' and
409        containing () gave an internal compiling error instead of "reference to
410        non-existent subpattern". Fortunately, when the pattern did exist, the
411        compiled code was correct. (When scanning forwards to check for the
412        existencd of the subpattern, it was treating the data ']' as terminating
413        the class, so got the count wrong. When actually compiling, the reference
414        was subsequently set up correctly.)
415    
416    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
417        it was being rejected as not supported by pcre_dfa_exec(), even though
418        other assertions are supported. I have made pcre_dfa_exec() support
419        (*FAIL).
420    
421    16. The implementation of 13c above involved the invention of a new opcode,
422        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
423        cannot be changed at match time, I realized I could make a small
424        improvement to matching performance by compiling OP_ALLANY instead of
425        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
426        on the OP_ANY path.
427    
428    17. Compiling pcretest on Windows with readline support failed without the
429        following two fixes: (1) Make the unistd.h include conditional on
430        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
431    
432    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
433        ncurses library to be included for pcretest when ReadLine support is
434        requested, but also to allow for it to be overridden. This patch came from
435        Daniel Bergström.
436    
437    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
438        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
439        any errors with the current Unicode tables. Thanks to Peter Kankowski for
440        spotting this.
441    
442    
443    Version 7.6 28-Jan-08
444  ---------------------  ---------------------
445    
446  1.  A character class containing a very large number of characters with  1.  A character class containing a very large number of characters with
447      codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer      codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
448      overflow.      overflow.
449    
450  2.  Patch to cut out the "long long" test in pcrecpp_unittest when  2.  Patch to cut out the "long long" test in pcrecpp_unittest when
451      HAVE_LONG_LONG is not defined.      HAVE_LONG_LONG is not defined.
452    
453  3.  Applied Christian Ehrlicher's patch to update the CMake build files to  3.  Applied Christian Ehrlicher's patch to update the CMake build files to
454      bring them up to date and include new features. This patch includes:      bring them up to date and include new features. This patch includes:
455    
456      - Fixed PH's badly added libz and libbz2 support.      - Fixed PH's badly added libz and libbz2 support.
457      - Fixed a problem with static linking.      - Fixed a problem with static linking.
458      - Added pcredemo.      - Added pcredemo. [But later removed - see 7 below.]
459      - Fixed dftables problem and added an option.      - Fixed dftables problem and added an option.
460      - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and      - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
461          HAVE_LONG_LONG.          HAVE_LONG_LONG.
462      - Added readline support for pcretest.      - Added readline support for pcretest.
463      - Added an listing of the option settings after cmake has run.      - Added an listing of the option settings after cmake has run.
464    
465  4.  A user submitted a patch to Makefile that makes it easy to created a dll  4.  A user submitted a patch to Makefile that makes it easy to create
466      under mingw. I added stuff to Makefile.am that cause it to include this      "pcre.dll" under mingw when using Configure/Make. I added stuff to
467      special target, without affecting anything else.      Makefile.am that cause it to include this special target, without
468        affecting anything else. Note that the same mingw target plus all
469        the other distribution libraries and programs are now supported
470        when configuring with CMake (see 6 below) instead of with
471        Configure/Make.
472    
473    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
474        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
475        exported in the Windows port". It has not yet been confirmed that the patch
476        solves the problem, but it does no harm.
477    
478    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
479        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
480        with CMake, and also correct the comment about stack recursion.
481    
482    7.  Remove the automatic building of pcredemo from the ./configure system and
483        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
484        of a program that users should build themselves after PCRE is installed, so
485        building it automatically is not really right. What is more, it gave
486        trouble in some build environments.
487    
488    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
489    
490    
491  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
492  ---------------------  ---------------------

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