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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.5 12-Nov-07  Version 8.10 03 May-2010
5    ------------------------
6    
7    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
8        THEN.
9    
10    2.  (*ACCEPT) was not working when inside an atomic group.
11    
12    3.  Inside a character class, \B is treated as a literal by default, but
13        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
14        causes the error). The code is unchanged, but I tidied the documentation.
15    
16    4.  Inside a character class, PCRE always treated \R and \X as literals,
17        whereas Perl faults them if its -w option is set. I have changed PCRE so
18        that it faults them when PCRE_EXTRA is set.
19    
20    5.  Added support for \N, which always matches any character other than
21        newline. (It is the same as "." when PCRE_DOTALL is not set.)
22    
23    6.  When compiling pcregrep with newer versions of gcc which may have
24        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
25        declared with attribute warn_unused_result" were given. Just casting the
26        result to (void) does not stop the warnings; a more elaborate fudge is
27        needed. I've used a macro to implement this.
28    
29    7.  Minor change to pcretest.c to avoid a compiler warning.
30    
31    8.  Added four artifical Unicode properties to help with an option to make
32        \s etc use properties (see next item). The new properties are: Xan
33        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
34    
35    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
36        use Unicode properties. (*UCP) at the start of a pattern can be used to set
37        this option. Modified pcretest to add /W to test this facility. Added
38        REG_UCP to make it available via the POSIX interface.
39    
40    10. Added --line-buffered to pcregrep.
41    
42    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
43        studied, and the match started with a letter with a code point greater than
44        127 whose first byte was different to the first byte of the other case of
45        the letter, the other case of this starting letter was not recognized.
46    
47    12. pcreposix.c included pcre.h before including pcre_internal.h. This caused a
48        conflict in the definition of PCRE_EXP_DECL. I have removed the include of
49        pcre.h as pcre_internal.h includes pcre.h itself. (This may be a bit of
50        historical tidying that never got done.)
51    
52    13. If a pattern that was studied started with a repeated Unicode property
53        test, for example, \p{Nd}+, there was the theoretical possibility of
54        setting up an incorrect bitmap of starting bytes, but fortunately it could
55        not have actually happened in practice until change 8 above was made (it
56        added property types that matched character-matching opcodes).
57    
58    14. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
59        possible starting bytes for non-anchored patterns.
60    
61    15. The "auto-possessify" feature of pcre_compile() now recognizes \R.
62    
63    
64    
65    Version 8.02 19-Mar-2010
66    ------------------------
67    
68    1.  The Unicode data tables have been updated to Unicode 5.2.0.
69    
70    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
71        configured.
72    
73    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
74        original author of that file, following a query about its status.
75    
76    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
77        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
78    
79    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
80        quantifier applied to a forward-referencing subroutine call, could compile
81        incorrect code or give the error "internal error: previously-checked
82        referenced subpattern not found".
83    
84    6.  Both MS Visual Studio and Symbian OS have problems with initializing
85        variables to point to external functions. For these systems, therefore,
86        pcre_malloc etc. are now initialized to local functions that call the
87        relevant global functions.
88    
89    7.  There were two entries missing in the vectors called coptable and poptable
90        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
91        I've fixed the data, and added a kludgy way of testing at compile time that
92        the lengths are correct (equal to the number of opcodes).
93    
94    8.  Following on from 7, I added a similar kludge to check the length of the
95        eint vector in pcreposix.c.
96    
97    9.  Error texts for pcre_compile() are held as one long string to avoid too
98        much relocation at load time. To find a text, the string is searched,
99        counting zeros. There was no check for running off the end of the string,
100        which could happen if a new error number was added without updating the
101        string.
102    
103    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
104    
105    11. \K was not working if it appeared in an atomic group or in a group that
106        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
107        \K is "not well defined" if used in an assertion. PCRE now accepts it if
108        the assertion is positive, but not if it is negative.
109    
110    12. Change 11 fortuitously reduced the size of the stack frame used in the
111        "match()" function of pcre_exec.c by one pointer. Forthcoming
112        implementation of support for (*MARK) will need an extra pointer on the
113        stack; I have reserved it now, so that the stack frame size does not
114        decrease.
115    
116    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
117        item in branch that calls a recursion is a subroutine call - as in the
118        second branch in the above example - was incorrectly given the compile-
119        time error "recursive call could loop indefinitely" because pcre_compile()
120        was not correctly checking the subroutine for matching a non-empty string.
121    
122    14. The checks for overrunning compiling workspace could trigger after an
123        overrun had occurred. This is a "should never occur" error, but it can be
124        triggered by pathological patterns such as hundreds of nested parentheses.
125        The checks now trigger 100 bytes before the end of the workspace.
126    
127    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
128    
129    
130    Version 8.01 19-Jan-2010
131    ------------------------
132    
133    1.  If a pattern contained a conditional subpattern with only one branch (in
134        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
135        computed the wrong minimum data length (which is of course zero for such
136        subpatterns). This could cause incorrect "no match" results.
137    
138    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
139        the pattern is reset in the first branch, pcre_compile() failed with
140        "internal error: code overflow at offset...". This happened only when
141        the reset was to the original external option setting. (An optimization
142        abstracts leading options settings into an external setting, which was the
143        cause of this.)
144    
145    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
146        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
147        assertion pattern did not match (meaning that the assertion was true), it
148        was incorrectly treated as false if the SKIP had been reached during the
149        matching. This also applied to assertions used as conditions.
150    
151    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
152        assertion subpattern, including such a pattern used as a condition,
153        unpredictable results occurred, instead of the error return
154        PCRE_ERROR_DFA_UITEM.
155    
156    5.  The C++ GlobalReplace function was not working like Perl for the special
157        situation when an empty string is matched. It now does the fancy magic
158        stuff that is necessary.
159    
160    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
161        removed. (These were left over from very, very early versions of PCRE.)
162    
163    7.  Some cosmetic changes to the code to make life easier when compiling it
164        as part of something else:
165    
166        (a) Change DEBUG to PCRE_DEBUG.
167    
168        (b) In pcre_compile(), rename the member of the "branch_chain" structure
169            called "current" as "current_branch", to prevent a collision with the
170            Linux macro when compiled as a kernel module.
171    
172        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
173            prevent a collision with the Linux macro when compiled as a kernel
174            module.
175    
176    8.  In pcre_compile() there are some checks for integer overflows that used to
177        cast potentially large values to (double). This has been changed to that
178        when building, a check for int64_t is made, and if it is found, it is used
179        instead, thus avoiding the use of floating point arithmetic. (There is no
180        other use of FP in PCRE.) If int64_t is not found, the fallback is to
181        double.
182    
183    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
184        2005 (difference between two addresses compared to an unsigned value).
185    
186    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
187        custom one, because of the following reported problem in Windows:
188    
189          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
190              under Win32.
191          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
192              therefore missing the function definition.
193          - The compiler thus generates a "C" signature for the test function.
194          - The linker fails to find the "C" function.
195          - PCRE fails to configure if asked to do so against libbz2.
196    
197    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
198        messages were output:
199    
200          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
201          rerunning libtoolize, to keep the correct libtool macros in-tree.
202          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
203    
204        I have done both of these things.
205    
206    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
207        most of the time, it *can* run out if it is given a pattern that contains a
208        runaway infinite recursion. I updated the discussion in the pcrestack man
209        page.
210    
211    13. Now that we have gone to the x.xx style of version numbers, the minor
212        version may start with zero. Using 08 or 09 is a bad idea because users
213        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
214        interpreted as invalid octal numbers. I've updated the previous comment in
215        configure.ac, and also added a check that gives an error if 08 or 09 are
216        used.
217    
218    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
219        causing partial matching to fail when the end of the subject matched \W
220        in a UTF-8 pattern where \W was quantified with a minimum of 3.
221    
222    15. There were some discrepancies between the declarations in pcre_internal.h
223        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
224        their definitions. The declarations used "const uschar *" and the
225        definitions used USPTR. Even though USPTR is normally defined as "const
226        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
227        reported that: "This difference in casting confuses some C++ compilers, for
228        example, SunCC recognizes above declarations as different functions and
229        generates broken code for hbpcre." I have changed the declarations to use
230        USPTR.
231    
232    16. GNU libtool is named differently on some systems. The autogen.sh script now
233        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
234        (FreeBSD).
235    
236    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
237        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
238        comment: "Figure out how to create a longlong from a string: strtoll and
239        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
240        instance, but it only takes 2 args instead of 3!"
241    
242    18. A subtle bug concerned with back references has been fixed by a change of
243        specification, with a corresponding code fix. A pattern such as
244        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
245        refers, was giving matches when it shouldn't. For example, xa=xaaa would
246        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
247        same bug. Such groups have to be quantified to be useful, or contained
248        inside another quantified group. (If there's no repetition, the reference
249        can never match.) The problem arises because, having left the group and
250        moved on to the rest of the pattern, a later failure that backtracks into
251        the group uses the captured value from the final iteration of the group
252        rather than the correct earlier one. I have fixed this in PCRE by forcing
253        any group that contains a reference to itself to be an atomic group; that
254        is, there cannot be any backtracking into it once it has completed. This is
255        similar to recursive and subroutine calls.
256    
257    
258    Version 8.00 19-Oct-09
259    ----------------------
260    
261    1.  The table for translating pcre_compile() error codes into POSIX error codes
262        was out-of-date, and there was no check on the pcre_compile() error code
263        being within the table. This could lead to an OK return being given in
264        error.
265    
266    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
267        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
268        in a Windows environment.
269    
270    3.  The pcregrep --count option prints the count for each file even when it is
271        zero, as does GNU grep. However, pcregrep was also printing all files when
272        --files-with-matches was added. Now, when both options are given, it prints
273        counts only for those files that have at least one match. (GNU grep just
274        prints the file name in this circumstance, but including the count seems
275        more useful - otherwise, why use --count?) Also ensured that the
276        combination -clh just lists non-zero counts, with no names.
277    
278    4.  The long form of the pcregrep -F option was incorrectly implemented as
279        --fixed_strings instead of --fixed-strings. This is an incompatible change,
280        but it seems right to fix it, and I didn't think it was worth preserving
281        the old behaviour.
282    
283    5.  The command line items --regex=pattern and --regexp=pattern were not
284        recognized by pcregrep, which required --regex pattern or --regexp pattern
285        (with a space rather than an '='). The man page documented the '=' forms,
286        which are compatible with GNU grep; these now work.
287    
288    6.  No libpcreposix.pc file was created for pkg-config; there was just
289        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
290    
291    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
292        when UCP support is not needed, by modifying the Python script that
293        generates it from Unicode data files. This should not matter if the module
294        is correctly used as a library, but I received one complaint about 50K of
295        unwanted data. My guess is that the person linked everything into his
296        program rather than using a library. Anyway, it does no harm.
297    
298    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
299        was a minimum greater than 1 for a wide character in a possessive
300        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
301        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
302        character. Chaos in the form of incorrect output or a compiling loop could
303        result.
304    
305    9.  The restrictions on what a pattern can contain when partial matching is
306        requested for pcre_exec() have been removed. All patterns can now be
307        partially matched by this function. In addition, if there are at least two
308        slots in the offset vector, the offset of the earliest inspected character
309        for the match and the offset of the end of the subject are set in them when
310        PCRE_ERROR_PARTIAL is returned.
311    
312    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
313        synonymous with PCRE_PARTIAL, for backwards compatibility, and
314        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
315        and may be more useful for multi-segment matching.
316    
317    11. Partial matching with pcre_exec() is now more intuitive. A partial match
318        used to be given if ever the end of the subject was reached; now it is
319        given only if matching could not proceed because another character was
320        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
321        string "Z", which now yields "no match" instead of "partial match". In the
322        case of pcre_dfa_exec(), "no match" is given if every matching path for the
323        final character ended with (*FAIL).
324    
325    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
326        if the pattern had a "must contain" character that was already found in the
327        earlier partial match, unless partial matching was again requested. For
328        example, with the pattern /dog.(body)?/, the "must contain" character is
329        "g". If the first part-match was for the string "dog", restarting with
330        "sbody" failed. This bug has been fixed.
331    
332    13. The string returned by pcre_dfa_exec() after a partial match has been
333        changed so that it starts at the first inspected character rather than the
334        first character of the match. This makes a difference only if the pattern
335        starts with a lookbehind assertion or \b or \B (\K is not supported by
336        pcre_dfa_exec()). It's an incompatible change, but it makes the two
337        matching functions compatible, and I think it's the right thing to do.
338    
339    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
340        so that the demonstration program is easily available in environments where
341        PCRE has not been installed from source.
342    
343    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
344        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
345        library.
346    
347    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
348        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
349        is not the first non-POSIX option to be added. Clearly some people find
350        these options useful.
351    
352    17. If a caller to the POSIX matching function regexec() passes a non-zero
353        value for nmatch with a NULL value for pmatch, the value of
354        nmatch is forced to zero.
355    
356    18. RunGrepTest did not have a test for the availability of the -u option of
357        the diff command, as RunTest does. It now checks in the same way as
358        RunTest, and also checks for the -b option.
359    
360    19. If an odd number of negated classes containing just a single character
361        interposed, within parentheses, between a forward reference to a named
362        subpattern and the definition of the subpattern, compilation crashed with
363        an internal error, complaining that it could not find the referenced
364        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
365        [The bug was that it was starting one character too far in when skipping
366        over the character class, thus treating the ] as data rather than
367        terminating the class. This meant it could skip too much.]
368    
369    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
370        /g option in pcretest when the pattern contains \K, which makes it possible
371        to have an empty string match not at the start, even when the pattern is
372        anchored. Updated pcretest and pcredemo to use this option.
373    
374    21. If the maximum number of capturing subpatterns in a recursion was greater
375        than the maximum at the outer level, the higher number was returned, but
376        with unset values at the outer level. The correct (outer level) value is
377        now given.
378    
379    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
380        PCRE did not set those parentheses (unlike Perl). I have now found a way to
381        make it do so. The string so far is captured, making this feature
382        compatible with Perl.
383    
384    23. The tests have been re-organized, adding tests 11 and 12, to make it
385        possible to check the Perl 5.10 features against Perl 5.10.
386    
387    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
388        pattern matches a fixed length string. PCRE did not allow this; now it
389        does. Neither allows recursion.
390    
391    25. I finally figured out how to implement a request to provide the minimum
392        length of subject string that was needed in order to match a given pattern.
393        (It was back references and recursion that I had previously got hung up
394        on.) This code has now been added to pcre_study(); it finds a lower bound
395        to the length of subject needed. It is not necessarily the greatest lower
396        bound, but using it to avoid searching strings that are too short does give
397        some useful speed-ups. The value is available to calling programs via
398        pcre_fullinfo().
399    
400    26. While implementing 25, I discovered to my embarrassment that pcretest had
401        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
402        study optimizations had never been tested with that matching function.
403        Oops. What is worse, even when it was passed study data, there was a bug in
404        pcre_dfa_exec() that meant it never actually used it. Double oops. There
405        were also very few tests of studied patterns with pcre_dfa_exec().
406    
407    27. If (?| is used to create subpatterns with duplicate numbers, they are now
408        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
409        on the other side of the coin, they are no longer allowed to have different
410        names, because these cannot be distinguished in PCRE, and this has caused
411        confusion. (This is a difference from Perl.)
412    
413    28. When duplicate subpattern names are present (necessarily with different
414        numbers, as required by 27 above), and a test is made by name in a
415        conditional pattern, either for a subpattern having been matched, or for
416        recursion in such a pattern, all the associated numbered subpatterns are
417        tested, and the overall condition is true if the condition is true for any
418        one of them. This is the way Perl works, and is also more like the way
419        testing by number works.
420    
421    
422    Version 7.9 11-Apr-09
423    ---------------------
424    
425    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
426        (pcretest), all targets were linked against these libraries. This included
427        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
428        libraries. This caused unwanted dependencies to be created. This problem
429        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
430        pcretest is linked with readline.
431    
432    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
433        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
434        moved outside it again, because FALSE and TRUE are already defined in AIX,
435        but BOOL is not.
436    
437    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
438        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
439    
440    4.  The pcregrep documentation said spaces were inserted as well as colons (or
441        hyphens) following file names and line numbers when outputting matching
442        lines. This is not true; no spaces are inserted. I have also clarified the
443        wording for the --colour (or --color) option.
444    
445    5.  In pcregrep, when --colour was used with -o, the list of matching strings
446        was not coloured; this is different to GNU grep, so I have changed it to be
447        the same.
448    
449    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
450        each matching line was coloured. Now it goes on to look for further matches
451        of any of the test patterns, which is the same behaviour as GNU grep.
452    
453    7.  A pattern that could match an empty string could cause pcregrep to loop; it
454        doesn't make sense to accept an empty string match in pcregrep, so I have
455        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
456        seems to be how GNU grep behaves.
457    
458    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
459        start or after a newline", because the conditional assertion was not being
460        correctly handled. The rule now is that both the assertion and what follows
461        in the first alternative must satisfy the test.
462    
463    9.  If auto-callout was enabled in a pattern with a conditional group whose
464        condition was an assertion, PCRE could crash during matching, both with
465        pcre_exec() and pcre_dfa_exec().
466    
467    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
468        used for matching.
469    
470    11. Unicode property support in character classes was not working for
471        characters (bytes) greater than 127 when not in UTF-8 mode.
472    
473    12. Added the -M command line option to pcretest.
474    
475    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
476    
477    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
478    
479    16. Added comments and documentation about mis-use of no_arg in the C++
480        wrapper.
481    
482    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
483        from Martin Jerabek that uses macro names for all relevant character and
484        string constants.
485    
486    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
487        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
488        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
489        these, but not everybody uses configure.
490    
491    19. A conditional group that had only one branch was not being correctly
492        recognized as an item that could match an empty string. This meant that an
493        enclosing group might also not be so recognized, causing infinite looping
494        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
495        with the subject "ab", where knowledge that the repeated group can match
496        nothing is needed in order to break the loop.
497    
498    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
499        exec(), but without supplying a callout function, matching went wrong.
500    
501    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
502        leak if the size of the offset vector was greater than 30. When the vector
503        is smaller, the saved offsets during recursion go onto a local stack
504        vector, but for larger vectors malloc() is used. It was failing to free
505        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
506        error, in fact).
507    
508    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
509        heapframe that is used only when UTF-8 support is enabled. This caused no
510        problem, but was untidy.
511    
512    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
513        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
514        included within another project.
515    
516    24. Steven Van Ingelgem's patches to add more options to the CMake support,
517        slightly modified by me:
518    
519          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
520              not building pcregrep.
521    
522          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
523              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
524    
525    25. Forward references, both numeric and by name, in patterns that made use of
526        duplicate group numbers, could behave incorrectly or give incorrect errors,
527        because when scanning forward to find the reference group, PCRE was not
528        taking into account the duplicate group numbers. A pattern such as
529        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
530    
531    26. Changed a few more instances of "const unsigned char *" to USPTR, making
532        the feature of a custom pointer more persuasive (as requested by a user).
533    
534    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
535        pcretest.c, inside #ifndefs, because it seems they are sometimes already
536        pre-defined.
537    
538    28. Added support for (*UTF8) at the start of a pattern.
539    
540    29. Arrange for flags added by the "release type" setting in CMake to be shown
541        in the configuration summary.
542    
543    
544    Version 7.8 05-Sep-08
545    ---------------------
546    
547    1.  Replaced UCP searching code with optimized version as implemented for Ad
548        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
549        stage table and inline lookup instead of a function, giving speed ups of 2
550        to 5 times on some simple patterns that I tested. Permission was given to
551        distribute the MultiStage2.py script that generates the tables (it's not in
552        the tarball, but is in the Subversion repository).
553    
554    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
555        scripts.
556    
557    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
558        a group with a zero qualifier. The result of the study could be incorrect,
559        or the function might crash, depending on the pattern.
560    
561    4.  Caseless matching was not working for non-ASCII characters in back
562        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
563        It now works when Unicode Property Support is available.
564    
565    5.  In pcretest, an escape such as \x{de} in the data was always generating
566        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
567        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
568        truncation.
569    
570    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
571    
572    7.  Added two (int) casts to pcregrep when printing the difference of two
573        pointers, in case they are 64-bit values.
574    
575    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
576        test 2 if it fails.
577    
578    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
579        and a #define of that name to empty if it is not externally set. This is to
580        allow users of MSVC to set it if necessary.
581    
582    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
583        the convenience functions in the pcre_get.c source file.
584    
585    11. An option change at the start of a pattern that had top-level alternatives
586        could cause overwriting and/or a crash. This command provoked a crash in
587        some environments:
588    
589          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
590    
591        This potential security problem was recorded as CVE-2008-2371.
592    
593    12. For a pattern where the match had to start at the beginning or immediately
594        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
595        pcre_dfa_exec() could read past the end of the passed subject if there was
596        no match. To help with detecting such bugs (e.g. with valgrind), I modified
597        pcretest so that it places the subject at the end of its malloc-ed buffer.
598    
599    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
600        exec() might read past the end of the data buffer in UTF-8 mode.
601    
602    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
603        the data contained the byte 0x85 as part of a UTF-8 character within its
604        first line. This applied both to normal and DFA matching.
605    
606    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
607        /^[^d]*?$/8 failed to match "abc".
608    
609    16. Added a missing copyright notice to pcrecpp_internal.h.
610    
611    17. Make it more clear in the documentation that values returned from
612        pcre_exec() in ovector are byte offsets, not character counts.
613    
614    18. Tidied a few places to stop certain compilers from issuing warnings.
615    
616    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
617        supplied by Stefan Weber. I made a further small update for 7.8 because
618        there is a change of source arrangements: the pcre_searchfuncs.c module is
619        replaced by pcre_ucd.c.
620    
621    
622    Version 7.7 07-May-08
623    ---------------------
624    
625    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
626        a string to a long long, pretend we don't even have a long long." This is
627        done by checking for the strtoq, strtoll, and _strtoi64 functions.
628    
629    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
630        pre-7.6 versions, which defined a global no_arg variable instead of putting
631        it in the RE class. (See also #8 below.)
632    
633    3.  Remove a line of dead code, identified by coverity and reported by Nuno
634        Lopes.
635    
636    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
637    
638        (1) The include/exclude patterns were being applied to the whole pathnames
639            of files, instead of just to the final components.
640    
641        (2) If there was more than one level of directory, the subdirectories were
642            skipped unless they satisfied the include/exclude conditions. This is
643            inconsistent with GNU grep (and could even be seen as contrary to the
644            pcregrep specification - which I improved to make it absolutely clear).
645            The action now is always to scan all levels of directory, and just
646            apply the include/exclude patterns to regular files.
647    
648    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
649        --exclude_dir in the tests to avoid scanning .svn directories.
650    
651    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
652        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
653        doesn't support NULs in patterns.
654    
655    7.  Added some missing "const"s to declarations of static tables in
656        pcre_compile.c and pcre_dfa_exec.c.
657    
658    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
659        caused by fix #2  above. (Subsequently also a second patch to fix the
660        first patch. And a third patch - this was a messy problem.)
661    
662    9.  Applied Craig's patch to remove the use of push_back().
663    
664    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
665        matching function regexec().
666    
667    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
668        which, however, unlike Perl's \g{...}, are subroutine calls, not back
669        references. PCRE supports relative numbers with this syntax (I don't think
670        Oniguruma does).
671    
672    12. Previously, a group with a zero repeat such as (...){0} was completely
673        omitted from the compiled regex. However, this means that if the group
674        was called as a subroutine from elsewhere in the pattern, things went wrong
675        (an internal error was given). Such groups are now left in the compiled
676        pattern, with a new opcode that causes them to be skipped at execution
677        time.
678    
679    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
680        to the way PCRE behaves:
681    
682        (a) A lone ] character is dis-allowed (Perl treats it as data).
683    
684        (b) A back reference to an unmatched subpattern matches an empty string
685            (Perl fails the current match path).
686    
687        (c) A data ] in a character class must be notated as \] because if the
688            first data character in a class is ], it defines an empty class. (In
689            Perl it is not possible to have an empty class.) The empty class []
690            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
691            The negative empty class [^] matches any one character, independently
692            of the DOTALL setting.
693    
694    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
695        non-existent subpattern following a character class starting with ']' and
696        containing () gave an internal compiling error instead of "reference to
697        non-existent subpattern". Fortunately, when the pattern did exist, the
698        compiled code was correct. (When scanning forwards to check for the
699        existencd of the subpattern, it was treating the data ']' as terminating
700        the class, so got the count wrong. When actually compiling, the reference
701        was subsequently set up correctly.)
702    
703    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
704        it was being rejected as not supported by pcre_dfa_exec(), even though
705        other assertions are supported. I have made pcre_dfa_exec() support
706        (*FAIL).
707    
708    16. The implementation of 13c above involved the invention of a new opcode,
709        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
710        cannot be changed at match time, I realized I could make a small
711        improvement to matching performance by compiling OP_ALLANY instead of
712        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
713        on the OP_ANY path.
714    
715    17. Compiling pcretest on Windows with readline support failed without the
716        following two fixes: (1) Make the unistd.h include conditional on
717        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
718    
719    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
720        ncurses library to be included for pcretest when ReadLine support is
721        requested, but also to allow for it to be overridden. This patch came from
722        Daniel Bergström.
723    
724    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
725        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
726        any errors with the current Unicode tables. Thanks to Peter Kankowski for
727        spotting this.
728    
729    
730    Version 7.6 28-Jan-08
731    ---------------------
732    
733    1.  A character class containing a very large number of characters with
734        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
735        overflow.
736    
737    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
738        HAVE_LONG_LONG is not defined.
739    
740    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
741        bring them up to date and include new features. This patch includes:
742    
743        - Fixed PH's badly added libz and libbz2 support.
744        - Fixed a problem with static linking.
745        - Added pcredemo. [But later removed - see 7 below.]
746        - Fixed dftables problem and added an option.
747        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
748            HAVE_LONG_LONG.
749        - Added readline support for pcretest.
750        - Added an listing of the option settings after cmake has run.
751    
752    4.  A user submitted a patch to Makefile that makes it easy to create
753        "pcre.dll" under mingw when using Configure/Make. I added stuff to
754        Makefile.am that cause it to include this special target, without
755        affecting anything else. Note that the same mingw target plus all
756        the other distribution libraries and programs are now supported
757        when configuring with CMake (see 6 below) instead of with
758        Configure/Make.
759    
760    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
761        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
762        exported in the Windows port". It has not yet been confirmed that the patch
763        solves the problem, but it does no harm.
764    
765    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
766        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
767        with CMake, and also correct the comment about stack recursion.
768    
769    7.  Remove the automatic building of pcredemo from the ./configure system and
770        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
771        of a program that users should build themselves after PCRE is installed, so
772        building it automatically is not really right. What is more, it gave
773        trouble in some build environments.
774    
775    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
776    
777    
778    Version 7.5 10-Jan-08
779  ---------------------  ---------------------
780    
781  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 850  Version 7.5 12-Nov-07
850      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
851      non-matching lines.      non-matching lines.
852    
853  14. The pattern (?=something)(?R) was not being diagnosed as a potentially  14. Added --file-offsets and --line-offsets to pcregrep.
854    
855    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
856      infinitely looping recursion. The bug was that positive lookaheads were not      infinitely looping recursion. The bug was that positive lookaheads were not
857      being skipped when checking for a possible empty match (negative lookaheads      being skipped when checking for a possible empty match (negative lookaheads
858      and both kinds of lookbehind were skipped).      and both kinds of lookbehind were skipped).
859    
860  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
861      inclusion of <windows.h> to before rather than after the definition of      inclusion of <windows.h> to before rather than after the definition of
862      INVALID_FILE_ATTRIBUTES (patch from David Byron).      INVALID_FILE_ATTRIBUTES (patch from David Byron).
863    
864  16. Specifying a possessive quantifier with a specific limit for a Unicode  17. Specifying a possessive quantifier with a specific limit for a Unicode
865      character property caused pcre_compile() to compile bad code, which led at      character property caused pcre_compile() to compile bad code, which led at
866      runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this      runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
867      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
868      caused the error; without that there was no problem.      caused the error; without that there was no problem.
869    
870  17. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.  18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
871    
872    19. Added --enable-pcretest-libreadline.
873    
874    20. In pcrecpp.cc, the variable 'count' was incremented twice in
875        RE::GlobalReplace(). As a result, the number of replacements returned was
876        double what it should be. I removed one of the increments, but Craig sent a
877        later patch that removed the other one (the right fix) and added unit tests
878        that check the return values (which was not done before).
879    
880    21. Several CMake things:
881    
882        (1) Arranged that, when cmake is used on Unix, the libraries end up with
883            the names libpcre and libpcreposix, not just pcre and pcreposix.
884    
885        (2) The above change means that pcretest and pcregrep are now correctly
886            linked with the newly-built libraries, not previously installed ones.
887    
888        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
889    
890    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
891        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
892        UTF-8 newline character). The key issue is that the pattern starts .*;
893        this means that the match must be either at the beginning, or after a
894        newline. The bug was in the code for advancing after a failed match and
895        checking that the new position followed a newline. It was not taking
896        account of UTF-8 characters correctly.
897    
898    23. PCRE was behaving differently from Perl in the way it recognized POSIX
899        character classes. PCRE was not treating the sequence [:...:] as a
900        character class unless the ... were all letters. Perl, however, seems to
901        allow any characters between [: and :], though of course it rejects as
902        unknown any "names" that contain non-letters, because all the known class
903        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
904        for example, whereas PCRE did not - it did not recognize a POSIX character
905        class. This seemed a bit dangerous, so the code has been changed to be
906        closer to Perl. The behaviour is not identical to Perl, because PCRE will
907        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
908        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
909        Perl does, and where it didn't before.
910    
911  18. Added --enable-pcretest-libreadline.  24. Rewrite so as to remove the single use of %n from pcregrep because in some
912        Windows environments %n is disabled by default.
913    
914    
915  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07

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