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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.6 14-Jan-08  Version 8.10 03-Jun-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        (#976).
47    
48    12. If a pattern that was studied started with a repeated Unicode property
49        test, for example, \p{Nd}+, there was the theoretical possibility of
50        setting up an incorrect bitmap of starting bytes, but fortunately it could
51        not have actually happened in practice until change 8 above was made (it
52        added property types that matched character-matching opcodes).
53    
54    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
55        possible starting bytes for non-anchored patterns.
56    
57    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
58        \R, and also a number of cases that involve Unicode properties, both
59        explicit and implicit when PCRE_UCP is set.
60    
61    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
62        input, it could crash or give wrong results if characters with values
63        greater than 0xc0 were present in the subject string. (Detail: it assumed
64        UTF-8 input when processing these items.)
65    
66    16. Added a lot of (int) casts to avoid compiler warnings in systems where
67        size_t is 64-bit (#991).
68    
69    17. Added a check for running out of memory when PCRE is compiled with
70        --disable-stack-for-recursion (#990).
71    
72    18. If the last data line in a file for pcretest does not have a newline on
73        the end, a newline was missing in the output.
74    
75    19. The default pcre_chartables.c file recognizes only ASCII characters (values
76        less than 128) in its various bitmaps. However, there is a facility for
77        generating tables according to the current locale when PCRE is compiled. It
78        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
79        characters, are recognized by isspace() and therefore were getting set in
80        these tables. This caused a problem in UTF-8 mode when pcre_study() was
81        used to create a list of bytes that can start a match. For \s, it was
82        including 0x85 and 0xa0, which of course cannot start UTF-8 characters. I
83        have changed the code so that only real ASCII characters (less than 128)
84        are set in this case because the \s etc escapes are documented as
85        recognizing only ASCII characters. (When PCRE_UCP is set - see 9 above -
86        the code is different altogether.)
87    
88    
89    Version 8.02 19-Mar-2010
90    ------------------------
91    
92    1.  The Unicode data tables have been updated to Unicode 5.2.0.
93    
94    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
95        configured.
96    
97    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
98        original author of that file, following a query about its status.
99    
100    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
101        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
102    
103    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
104        quantifier applied to a forward-referencing subroutine call, could compile
105        incorrect code or give the error "internal error: previously-checked
106        referenced subpattern not found".
107    
108    6.  Both MS Visual Studio and Symbian OS have problems with initializing
109        variables to point to external functions. For these systems, therefore,
110        pcre_malloc etc. are now initialized to local functions that call the
111        relevant global functions.
112    
113    7.  There were two entries missing in the vectors called coptable and poptable
114        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
115        I've fixed the data, and added a kludgy way of testing at compile time that
116        the lengths are correct (equal to the number of opcodes).
117    
118    8.  Following on from 7, I added a similar kludge to check the length of the
119        eint vector in pcreposix.c.
120    
121    9.  Error texts for pcre_compile() are held as one long string to avoid too
122        much relocation at load time. To find a text, the string is searched,
123        counting zeros. There was no check for running off the end of the string,
124        which could happen if a new error number was added without updating the
125        string.
126    
127    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
128    
129    11. \K was not working if it appeared in an atomic group or in a group that
130        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
131        \K is "not well defined" if used in an assertion. PCRE now accepts it if
132        the assertion is positive, but not if it is negative.
133    
134    12. Change 11 fortuitously reduced the size of the stack frame used in the
135        "match()" function of pcre_exec.c by one pointer. Forthcoming
136        implementation of support for (*MARK) will need an extra pointer on the
137        stack; I have reserved it now, so that the stack frame size does not
138        decrease.
139    
140    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
141        item in branch that calls a recursion is a subroutine call - as in the
142        second branch in the above example - was incorrectly given the compile-
143        time error "recursive call could loop indefinitely" because pcre_compile()
144        was not correctly checking the subroutine for matching a non-empty string.
145    
146    14. The checks for overrunning compiling workspace could trigger after an
147        overrun had occurred. This is a "should never occur" error, but it can be
148        triggered by pathological patterns such as hundreds of nested parentheses.
149        The checks now trigger 100 bytes before the end of the workspace.
150    
151    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
152    
153    
154    Version 8.01 19-Jan-2010
155    ------------------------
156    
157    1.  If a pattern contained a conditional subpattern with only one branch (in
158        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
159        computed the wrong minimum data length (which is of course zero for such
160        subpatterns). This could cause incorrect "no match" results.
161    
162    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
163        the pattern is reset in the first branch, pcre_compile() failed with
164        "internal error: code overflow at offset...". This happened only when
165        the reset was to the original external option setting. (An optimization
166        abstracts leading options settings into an external setting, which was the
167        cause of this.)
168    
169    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
170        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
171        assertion pattern did not match (meaning that the assertion was true), it
172        was incorrectly treated as false if the SKIP had been reached during the
173        matching. This also applied to assertions used as conditions.
174    
175    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
176        assertion subpattern, including such a pattern used as a condition,
177        unpredictable results occurred, instead of the error return
178        PCRE_ERROR_DFA_UITEM.
179    
180    5.  The C++ GlobalReplace function was not working like Perl for the special
181        situation when an empty string is matched. It now does the fancy magic
182        stuff that is necessary.
183    
184    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
185        removed. (These were left over from very, very early versions of PCRE.)
186    
187    7.  Some cosmetic changes to the code to make life easier when compiling it
188        as part of something else:
189    
190        (a) Change DEBUG to PCRE_DEBUG.
191    
192        (b) In pcre_compile(), rename the member of the "branch_chain" structure
193            called "current" as "current_branch", to prevent a collision with the
194            Linux macro when compiled as a kernel module.
195    
196        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
197            prevent a collision with the Linux macro when compiled as a kernel
198            module.
199    
200    8.  In pcre_compile() there are some checks for integer overflows that used to
201        cast potentially large values to (double). This has been changed to that
202        when building, a check for int64_t is made, and if it is found, it is used
203        instead, thus avoiding the use of floating point arithmetic. (There is no
204        other use of FP in PCRE.) If int64_t is not found, the fallback is to
205        double.
206    
207    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
208        2005 (difference between two addresses compared to an unsigned value).
209    
210    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
211        custom one, because of the following reported problem in Windows:
212    
213          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
214              under Win32.
215          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
216              therefore missing the function definition.
217          - The compiler thus generates a "C" signature for the test function.
218          - The linker fails to find the "C" function.
219          - PCRE fails to configure if asked to do so against libbz2.
220    
221    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
222        messages were output:
223    
224          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
225          rerunning libtoolize, to keep the correct libtool macros in-tree.
226          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
227    
228        I have done both of these things.
229    
230    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
231        most of the time, it *can* run out if it is given a pattern that contains a
232        runaway infinite recursion. I updated the discussion in the pcrestack man
233        page.
234    
235    13. Now that we have gone to the x.xx style of version numbers, the minor
236        version may start with zero. Using 08 or 09 is a bad idea because users
237        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
238        interpreted as invalid octal numbers. I've updated the previous comment in
239        configure.ac, and also added a check that gives an error if 08 or 09 are
240        used.
241    
242    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
243        causing partial matching to fail when the end of the subject matched \W
244        in a UTF-8 pattern where \W was quantified with a minimum of 3.
245    
246    15. There were some discrepancies between the declarations in pcre_internal.h
247        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
248        their definitions. The declarations used "const uschar *" and the
249        definitions used USPTR. Even though USPTR is normally defined as "const
250        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
251        reported that: "This difference in casting confuses some C++ compilers, for
252        example, SunCC recognizes above declarations as different functions and
253        generates broken code for hbpcre." I have changed the declarations to use
254        USPTR.
255    
256    16. GNU libtool is named differently on some systems. The autogen.sh script now
257        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
258        (FreeBSD).
259    
260    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
261        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
262        comment: "Figure out how to create a longlong from a string: strtoll and
263        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
264        instance, but it only takes 2 args instead of 3!"
265    
266    18. A subtle bug concerned with back references has been fixed by a change of
267        specification, with a corresponding code fix. A pattern such as
268        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
269        refers, was giving matches when it shouldn't. For example, xa=xaaa would
270        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
271        same bug. Such groups have to be quantified to be useful, or contained
272        inside another quantified group. (If there's no repetition, the reference
273        can never match.) The problem arises because, having left the group and
274        moved on to the rest of the pattern, a later failure that backtracks into
275        the group uses the captured value from the final iteration of the group
276        rather than the correct earlier one. I have fixed this in PCRE by forcing
277        any group that contains a reference to itself to be an atomic group; that
278        is, there cannot be any backtracking into it once it has completed. This is
279        similar to recursive and subroutine calls.
280    
281    
282    Version 8.00 19-Oct-09
283    ----------------------
284    
285    1.  The table for translating pcre_compile() error codes into POSIX error codes
286        was out-of-date, and there was no check on the pcre_compile() error code
287        being within the table. This could lead to an OK return being given in
288        error.
289    
290    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
291        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
292        in a Windows environment.
293    
294    3.  The pcregrep --count option prints the count for each file even when it is
295        zero, as does GNU grep. However, pcregrep was also printing all files when
296        --files-with-matches was added. Now, when both options are given, it prints
297        counts only for those files that have at least one match. (GNU grep just
298        prints the file name in this circumstance, but including the count seems
299        more useful - otherwise, why use --count?) Also ensured that the
300        combination -clh just lists non-zero counts, with no names.
301    
302    4.  The long form of the pcregrep -F option was incorrectly implemented as
303        --fixed_strings instead of --fixed-strings. This is an incompatible change,
304        but it seems right to fix it, and I didn't think it was worth preserving
305        the old behaviour.
306    
307    5.  The command line items --regex=pattern and --regexp=pattern were not
308        recognized by pcregrep, which required --regex pattern or --regexp pattern
309        (with a space rather than an '='). The man page documented the '=' forms,
310        which are compatible with GNU grep; these now work.
311    
312    6.  No libpcreposix.pc file was created for pkg-config; there was just
313        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
314    
315    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
316        when UCP support is not needed, by modifying the Python script that
317        generates it from Unicode data files. This should not matter if the module
318        is correctly used as a library, but I received one complaint about 50K of
319        unwanted data. My guess is that the person linked everything into his
320        program rather than using a library. Anyway, it does no harm.
321    
322    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
323        was a minimum greater than 1 for a wide character in a possessive
324        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
325        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
326        character. Chaos in the form of incorrect output or a compiling loop could
327        result.
328    
329    9.  The restrictions on what a pattern can contain when partial matching is
330        requested for pcre_exec() have been removed. All patterns can now be
331        partially matched by this function. In addition, if there are at least two
332        slots in the offset vector, the offset of the earliest inspected character
333        for the match and the offset of the end of the subject are set in them when
334        PCRE_ERROR_PARTIAL is returned.
335    
336    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
337        synonymous with PCRE_PARTIAL, for backwards compatibility, and
338        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
339        and may be more useful for multi-segment matching.
340    
341    11. Partial matching with pcre_exec() is now more intuitive. A partial match
342        used to be given if ever the end of the subject was reached; now it is
343        given only if matching could not proceed because another character was
344        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
345        string "Z", which now yields "no match" instead of "partial match". In the
346        case of pcre_dfa_exec(), "no match" is given if every matching path for the
347        final character ended with (*FAIL).
348    
349    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
350        if the pattern had a "must contain" character that was already found in the
351        earlier partial match, unless partial matching was again requested. For
352        example, with the pattern /dog.(body)?/, the "must contain" character is
353        "g". If the first part-match was for the string "dog", restarting with
354        "sbody" failed. This bug has been fixed.
355    
356    13. The string returned by pcre_dfa_exec() after a partial match has been
357        changed so that it starts at the first inspected character rather than the
358        first character of the match. This makes a difference only if the pattern
359        starts with a lookbehind assertion or \b or \B (\K is not supported by
360        pcre_dfa_exec()). It's an incompatible change, but it makes the two
361        matching functions compatible, and I think it's the right thing to do.
362    
363    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
364        so that the demonstration program is easily available in environments where
365        PCRE has not been installed from source.
366    
367    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
368        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
369        library.
370    
371    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
372        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
373        is not the first non-POSIX option to be added. Clearly some people find
374        these options useful.
375    
376    17. If a caller to the POSIX matching function regexec() passes a non-zero
377        value for nmatch with a NULL value for pmatch, the value of
378        nmatch is forced to zero.
379    
380    18. RunGrepTest did not have a test for the availability of the -u option of
381        the diff command, as RunTest does. It now checks in the same way as
382        RunTest, and also checks for the -b option.
383    
384    19. If an odd number of negated classes containing just a single character
385        interposed, within parentheses, between a forward reference to a named
386        subpattern and the definition of the subpattern, compilation crashed with
387        an internal error, complaining that it could not find the referenced
388        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
389        [The bug was that it was starting one character too far in when skipping
390        over the character class, thus treating the ] as data rather than
391        terminating the class. This meant it could skip too much.]
392    
393    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
394        /g option in pcretest when the pattern contains \K, which makes it possible
395        to have an empty string match not at the start, even when the pattern is
396        anchored. Updated pcretest and pcredemo to use this option.
397    
398    21. If the maximum number of capturing subpatterns in a recursion was greater
399        than the maximum at the outer level, the higher number was returned, but
400        with unset values at the outer level. The correct (outer level) value is
401        now given.
402    
403    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
404        PCRE did not set those parentheses (unlike Perl). I have now found a way to
405        make it do so. The string so far is captured, making this feature
406        compatible with Perl.
407    
408    23. The tests have been re-organized, adding tests 11 and 12, to make it
409        possible to check the Perl 5.10 features against Perl 5.10.
410    
411    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
412        pattern matches a fixed length string. PCRE did not allow this; now it
413        does. Neither allows recursion.
414    
415    25. I finally figured out how to implement a request to provide the minimum
416        length of subject string that was needed in order to match a given pattern.
417        (It was back references and recursion that I had previously got hung up
418        on.) This code has now been added to pcre_study(); it finds a lower bound
419        to the length of subject needed. It is not necessarily the greatest lower
420        bound, but using it to avoid searching strings that are too short does give
421        some useful speed-ups. The value is available to calling programs via
422        pcre_fullinfo().
423    
424    26. While implementing 25, I discovered to my embarrassment that pcretest had
425        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
426        study optimizations had never been tested with that matching function.
427        Oops. What is worse, even when it was passed study data, there was a bug in
428        pcre_dfa_exec() that meant it never actually used it. Double oops. There
429        were also very few tests of studied patterns with pcre_dfa_exec().
430    
431    27. If (?| is used to create subpatterns with duplicate numbers, they are now
432        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
433        on the other side of the coin, they are no longer allowed to have different
434        names, because these cannot be distinguished in PCRE, and this has caused
435        confusion. (This is a difference from Perl.)
436    
437    28. When duplicate subpattern names are present (necessarily with different
438        numbers, as required by 27 above), and a test is made by name in a
439        conditional pattern, either for a subpattern having been matched, or for
440        recursion in such a pattern, all the associated numbered subpatterns are
441        tested, and the overall condition is true if the condition is true for any
442        one of them. This is the way Perl works, and is also more like the way
443        testing by number works.
444    
445    
446    Version 7.9 11-Apr-09
447    ---------------------
448    
449    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
450        (pcretest), all targets were linked against these libraries. This included
451        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
452        libraries. This caused unwanted dependencies to be created. This problem
453        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
454        pcretest is linked with readline.
455    
456    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
457        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
458        moved outside it again, because FALSE and TRUE are already defined in AIX,
459        but BOOL is not.
460    
461    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
462        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
463    
464    4.  The pcregrep documentation said spaces were inserted as well as colons (or
465        hyphens) following file names and line numbers when outputting matching
466        lines. This is not true; no spaces are inserted. I have also clarified the
467        wording for the --colour (or --color) option.
468    
469    5.  In pcregrep, when --colour was used with -o, the list of matching strings
470        was not coloured; this is different to GNU grep, so I have changed it to be
471        the same.
472    
473    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
474        each matching line was coloured. Now it goes on to look for further matches
475        of any of the test patterns, which is the same behaviour as GNU grep.
476    
477    7.  A pattern that could match an empty string could cause pcregrep to loop; it
478        doesn't make sense to accept an empty string match in pcregrep, so I have
479        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
480        seems to be how GNU grep behaves.
481    
482    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
483        start or after a newline", because the conditional assertion was not being
484        correctly handled. The rule now is that both the assertion and what follows
485        in the first alternative must satisfy the test.
486    
487    9.  If auto-callout was enabled in a pattern with a conditional group whose
488        condition was an assertion, PCRE could crash during matching, both with
489        pcre_exec() and pcre_dfa_exec().
490    
491    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
492        used for matching.
493    
494    11. Unicode property support in character classes was not working for
495        characters (bytes) greater than 127 when not in UTF-8 mode.
496    
497    12. Added the -M command line option to pcretest.
498    
499    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
500    
501    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
502    
503    16. Added comments and documentation about mis-use of no_arg in the C++
504        wrapper.
505    
506    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
507        from Martin Jerabek that uses macro names for all relevant character and
508        string constants.
509    
510    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
511        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
512        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
513        these, but not everybody uses configure.
514    
515    19. A conditional group that had only one branch was not being correctly
516        recognized as an item that could match an empty string. This meant that an
517        enclosing group might also not be so recognized, causing infinite looping
518        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
519        with the subject "ab", where knowledge that the repeated group can match
520        nothing is needed in order to break the loop.
521    
522    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
523        exec(), but without supplying a callout function, matching went wrong.
524    
525    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
526        leak if the size of the offset vector was greater than 30. When the vector
527        is smaller, the saved offsets during recursion go onto a local stack
528        vector, but for larger vectors malloc() is used. It was failing to free
529        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
530        error, in fact).
531    
532    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
533        heapframe that is used only when UTF-8 support is enabled. This caused no
534        problem, but was untidy.
535    
536    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
537        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
538        included within another project.
539    
540    24. Steven Van Ingelgem's patches to add more options to the CMake support,
541        slightly modified by me:
542    
543          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
544              not building pcregrep.
545    
546          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
547              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
548    
549    25. Forward references, both numeric and by name, in patterns that made use of
550        duplicate group numbers, could behave incorrectly or give incorrect errors,
551        because when scanning forward to find the reference group, PCRE was not
552        taking into account the duplicate group numbers. A pattern such as
553        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
554    
555    26. Changed a few more instances of "const unsigned char *" to USPTR, making
556        the feature of a custom pointer more persuasive (as requested by a user).
557    
558    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
559        pcretest.c, inside #ifndefs, because it seems they are sometimes already
560        pre-defined.
561    
562    28. Added support for (*UTF8) at the start of a pattern.
563    
564    29. Arrange for flags added by the "release type" setting in CMake to be shown
565        in the configuration summary.
566    
567    
568    Version 7.8 05-Sep-08
569  ---------------------  ---------------------
570    
571  1.  A class with a very large number of characters with codepoints greater  1.  Replaced UCP searching code with optimized version as implemented for Ad
572      than 255 (in UTF-8 mode, of course), caused a buffer overflow.      Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
573        stage table and inline lookup instead of a function, giving speed ups of 2
574        to 5 times on some simple patterns that I tested. Permission was given to
575        distribute the MultiStage2.py script that generates the tables (it's not in
576        the tarball, but is in the Subversion repository).
577    
578    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
579        scripts.
580    
581    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
582        a group with a zero qualifier. The result of the study could be incorrect,
583        or the function might crash, depending on the pattern.
584    
585    4.  Caseless matching was not working for non-ASCII characters in back
586        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
587        It now works when Unicode Property Support is available.
588    
589    5.  In pcretest, an escape such as \x{de} in the data was always generating
590        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
591        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
592        truncation.
593    
594    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
595    
596    7.  Added two (int) casts to pcregrep when printing the difference of two
597        pointers, in case they are 64-bit values.
598    
599    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
600        test 2 if it fails.
601    
602    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
603        and a #define of that name to empty if it is not externally set. This is to
604        allow users of MSVC to set it if necessary.
605    
606    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
607        the convenience functions in the pcre_get.c source file.
608    
609    11. An option change at the start of a pattern that had top-level alternatives
610        could cause overwriting and/or a crash. This command provoked a crash in
611        some environments:
612    
613          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
614    
615        This potential security problem was recorded as CVE-2008-2371.
616    
617    12. For a pattern where the match had to start at the beginning or immediately
618        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
619        pcre_dfa_exec() could read past the end of the passed subject if there was
620        no match. To help with detecting such bugs (e.g. with valgrind), I modified
621        pcretest so that it places the subject at the end of its malloc-ed buffer.
622    
623    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
624        exec() might read past the end of the data buffer in UTF-8 mode.
625    
626    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
627        the data contained the byte 0x85 as part of a UTF-8 character within its
628        first line. This applied both to normal and DFA matching.
629    
630    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
631        /^[^d]*?$/8 failed to match "abc".
632    
633    16. Added a missing copyright notice to pcrecpp_internal.h.
634    
635    17. Make it more clear in the documentation that values returned from
636        pcre_exec() in ovector are byte offsets, not character counts.
637    
638    18. Tidied a few places to stop certain compilers from issuing warnings.
639    
640    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
641        supplied by Stefan Weber. I made a further small update for 7.8 because
642        there is a change of source arrangements: the pcre_searchfuncs.c module is
643        replaced by pcre_ucd.c.
644    
645    
646    Version 7.7 07-May-08
647    ---------------------
648    
649    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
650        a string to a long long, pretend we don't even have a long long." This is
651        done by checking for the strtoq, strtoll, and _strtoi64 functions.
652    
653    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
654        pre-7.6 versions, which defined a global no_arg variable instead of putting
655        it in the RE class. (See also #8 below.)
656    
657    3.  Remove a line of dead code, identified by coverity and reported by Nuno
658        Lopes.
659    
660    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
661    
662        (1) The include/exclude patterns were being applied to the whole pathnames
663            of files, instead of just to the final components.
664    
665        (2) If there was more than one level of directory, the subdirectories were
666            skipped unless they satisfied the include/exclude conditions. This is
667            inconsistent with GNU grep (and could even be seen as contrary to the
668            pcregrep specification - which I improved to make it absolutely clear).
669            The action now is always to scan all levels of directory, and just
670            apply the include/exclude patterns to regular files.
671    
672    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
673        --exclude_dir in the tests to avoid scanning .svn directories.
674    
675    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
676        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
677        doesn't support NULs in patterns.
678    
679    7.  Added some missing "const"s to declarations of static tables in
680        pcre_compile.c and pcre_dfa_exec.c.
681    
682    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
683        caused by fix #2  above. (Subsequently also a second patch to fix the
684        first patch. And a third patch - this was a messy problem.)
685    
686    9.  Applied Craig's patch to remove the use of push_back().
687    
688    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
689        matching function regexec().
690    
691    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
692        which, however, unlike Perl's \g{...}, are subroutine calls, not back
693        references. PCRE supports relative numbers with this syntax (I don't think
694        Oniguruma does).
695    
696    12. Previously, a group with a zero repeat such as (...){0} was completely
697        omitted from the compiled regex. However, this means that if the group
698        was called as a subroutine from elsewhere in the pattern, things went wrong
699        (an internal error was given). Such groups are now left in the compiled
700        pattern, with a new opcode that causes them to be skipped at execution
701        time.
702    
703    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
704        to the way PCRE behaves:
705    
706        (a) A lone ] character is dis-allowed (Perl treats it as data).
707    
708        (b) A back reference to an unmatched subpattern matches an empty string
709            (Perl fails the current match path).
710    
711        (c) A data ] in a character class must be notated as \] because if the
712            first data character in a class is ], it defines an empty class. (In
713            Perl it is not possible to have an empty class.) The empty class []
714            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
715            The negative empty class [^] matches any one character, independently
716            of the DOTALL setting.
717    
718    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
719        non-existent subpattern following a character class starting with ']' and
720        containing () gave an internal compiling error instead of "reference to
721        non-existent subpattern". Fortunately, when the pattern did exist, the
722        compiled code was correct. (When scanning forwards to check for the
723        existencd of the subpattern, it was treating the data ']' as terminating
724        the class, so got the count wrong. When actually compiling, the reference
725        was subsequently set up correctly.)
726    
727    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
728        it was being rejected as not supported by pcre_dfa_exec(), even though
729        other assertions are supported. I have made pcre_dfa_exec() support
730        (*FAIL).
731    
732    16. The implementation of 13c above involved the invention of a new opcode,
733        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
734        cannot be changed at match time, I realized I could make a small
735        improvement to matching performance by compiling OP_ALLANY instead of
736        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
737        on the OP_ANY path.
738    
739    17. Compiling pcretest on Windows with readline support failed without the
740        following two fixes: (1) Make the unistd.h include conditional on
741        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
742    
743    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
744        ncurses library to be included for pcretest when ReadLine support is
745        requested, but also to allow for it to be overridden. This patch came from
746        Daniel Bergström.
747    
748    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
749        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
750        any errors with the current Unicode tables. Thanks to Peter Kankowski for
751        spotting this.
752    
753    
754    Version 7.6 28-Jan-08
755    ---------------------
756    
757    1.  A character class containing a very large number of characters with
758        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
759        overflow.
760    
761    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
762        HAVE_LONG_LONG is not defined.
763    
764    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
765        bring them up to date and include new features. This patch includes:
766    
767        - Fixed PH's badly added libz and libbz2 support.
768        - Fixed a problem with static linking.
769        - Added pcredemo. [But later removed - see 7 below.]
770        - Fixed dftables problem and added an option.
771        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
772            HAVE_LONG_LONG.
773        - Added readline support for pcretest.
774        - Added an listing of the option settings after cmake has run.
775    
776    4.  A user submitted a patch to Makefile that makes it easy to create
777        "pcre.dll" under mingw when using Configure/Make. I added stuff to
778        Makefile.am that cause it to include this special target, without
779        affecting anything else. Note that the same mingw target plus all
780        the other distribution libraries and programs are now supported
781        when configuring with CMake (see 6 below) instead of with
782        Configure/Make.
783    
784    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
785        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
786        exported in the Windows port". It has not yet been confirmed that the patch
787        solves the problem, but it does no harm.
788    
789    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
790        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
791        with CMake, and also correct the comment about stack recursion.
792    
793    7.  Remove the automatic building of pcredemo from the ./configure system and
794        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
795        of a program that users should build themselves after PCRE is installed, so
796        building it automatically is not really right. What is more, it gave
797        trouble in some build environments.
798    
799    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
800    
801    
802  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
803  ---------------------  ---------------------

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