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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.6 14-Jan-08  Version 8.11 10-Oct-2010
5    ------------------------
6    
7    1.  (*THEN) was not working properly if there were untried alternatives prior
8        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
9        backtracked to try for "b" instead of moving to the next alternative branch
10        at the same level (in this case, to look for "c"). The Perl documentation
11        is clear that when (*THEN) is backtracked onto, it goes to the "next
12        alternative in the innermost enclosing group".
13    
14    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
15        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
16        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
17        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
18        (*THEN).
19    
20    3.  If \s appeared in a character class, it removed the VT character from
21        the class, even if it had been included by some previous item, for example
22        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
23        of \s, but is part of the POSIX "space" class.)
24    
25    
26    Version 8.10 25-Jun-2010
27    ------------------------
28    
29    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
30        THEN.
31    
32    2.  (*ACCEPT) was not working when inside an atomic group.
33    
34    3.  Inside a character class, \B is treated as a literal by default, but
35        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
36        causes the error). The code is unchanged, but I tidied the documentation.
37    
38    4.  Inside a character class, PCRE always treated \R and \X as literals,
39        whereas Perl faults them if its -w option is set. I have changed PCRE so
40        that it faults them when PCRE_EXTRA is set.
41    
42    5.  Added support for \N, which always matches any character other than
43        newline. (It is the same as "." when PCRE_DOTALL is not set.)
44    
45    6.  When compiling pcregrep with newer versions of gcc which may have
46        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
47        declared with attribute warn_unused_result" were given. Just casting the
48        result to (void) does not stop the warnings; a more elaborate fudge is
49        needed. I've used a macro to implement this.
50    
51    7.  Minor change to pcretest.c to avoid a compiler warning.
52    
53    8.  Added four artifical Unicode properties to help with an option to make
54        \s etc use properties (see next item). The new properties are: Xan
55        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
56    
57    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
58        use Unicode properties. (*UCP) at the start of a pattern can be used to set
59        this option. Modified pcretest to add /W to test this facility. Added
60        REG_UCP to make it available via the POSIX interface.
61    
62    10. Added --line-buffered to pcregrep.
63    
64    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
65        studied, and the match started with a letter with a code point greater than
66        127 whose first byte was different to the first byte of the other case of
67        the letter, the other case of this starting letter was not recognized
68        (#976).
69    
70    12. If a pattern that was studied started with a repeated Unicode property
71        test, for example, \p{Nd}+, there was the theoretical possibility of
72        setting up an incorrect bitmap of starting bytes, but fortunately it could
73        not have actually happened in practice until change 8 above was made (it
74        added property types that matched character-matching opcodes).
75    
76    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
77        possible starting bytes for non-anchored patterns.
78    
79    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
80        \R, and also a number of cases that involve Unicode properties, both
81        explicit and implicit when PCRE_UCP is set.
82    
83    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
84        input, it could crash or give wrong results if characters with values
85        greater than 0xc0 were present in the subject string. (Detail: it assumed
86        UTF-8 input when processing these items.)
87    
88    16. Added a lot of (int) casts to avoid compiler warnings in systems where
89        size_t is 64-bit (#991).
90    
91    17. Added a check for running out of memory when PCRE is compiled with
92        --disable-stack-for-recursion (#990).
93    
94    18. If the last data line in a file for pcretest does not have a newline on
95        the end, a newline was missing in the output.
96    
97    19. The default pcre_chartables.c file recognizes only ASCII characters (values
98        less than 128) in its various bitmaps. However, there is a facility for
99        generating tables according to the current locale when PCRE is compiled. It
100        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
101        characters, are recognized by isspace() and therefore were getting set in
102        these tables, and indeed these tables seem to approximate to ISO 8859. This
103        caused a problem in UTF-8 mode when pcre_study() was used to create a list
104        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
105        which of course cannot start UTF-8 characters. I have changed the code so
106        that only real ASCII characters (less than 128) and the correct starting
107        bytes for UTF-8 encodings are set for characters greater than 127 when in
108        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
109        altogether.)
110    
111    20. Added the /T option to pcretest so as to be able to run tests with non-
112        standard character tables, thus making it possible to include the tests
113        used for 19 above in the standard set of tests.
114    
115    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
116        reference to a subpattern the other side of a comment that contains an
117        opening parenthesis caused either an internal compiling error, or a
118        reference to the wrong subpattern.
119    
120    
121    Version 8.02 19-Mar-2010
122    ------------------------
123    
124    1.  The Unicode data tables have been updated to Unicode 5.2.0.
125    
126    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
127        configured.
128    
129    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
130        original author of that file, following a query about its status.
131    
132    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
133        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
134    
135    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
136        quantifier applied to a forward-referencing subroutine call, could compile
137        incorrect code or give the error "internal error: previously-checked
138        referenced subpattern not found".
139    
140    6.  Both MS Visual Studio and Symbian OS have problems with initializing
141        variables to point to external functions. For these systems, therefore,
142        pcre_malloc etc. are now initialized to local functions that call the
143        relevant global functions.
144    
145    7.  There were two entries missing in the vectors called coptable and poptable
146        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
147        I've fixed the data, and added a kludgy way of testing at compile time that
148        the lengths are correct (equal to the number of opcodes).
149    
150    8.  Following on from 7, I added a similar kludge to check the length of the
151        eint vector in pcreposix.c.
152    
153    9.  Error texts for pcre_compile() are held as one long string to avoid too
154        much relocation at load time. To find a text, the string is searched,
155        counting zeros. There was no check for running off the end of the string,
156        which could happen if a new error number was added without updating the
157        string.
158    
159    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
160    
161    11. \K was not working if it appeared in an atomic group or in a group that
162        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
163        \K is "not well defined" if used in an assertion. PCRE now accepts it if
164        the assertion is positive, but not if it is negative.
165    
166    12. Change 11 fortuitously reduced the size of the stack frame used in the
167        "match()" function of pcre_exec.c by one pointer. Forthcoming
168        implementation of support for (*MARK) will need an extra pointer on the
169        stack; I have reserved it now, so that the stack frame size does not
170        decrease.
171    
172    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
173        item in branch that calls a recursion is a subroutine call - as in the
174        second branch in the above example - was incorrectly given the compile-
175        time error "recursive call could loop indefinitely" because pcre_compile()
176        was not correctly checking the subroutine for matching a non-empty string.
177    
178    14. The checks for overrunning compiling workspace could trigger after an
179        overrun had occurred. This is a "should never occur" error, but it can be
180        triggered by pathological patterns such as hundreds of nested parentheses.
181        The checks now trigger 100 bytes before the end of the workspace.
182    
183    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
184    
185    
186    Version 8.01 19-Jan-2010
187    ------------------------
188    
189    1.  If a pattern contained a conditional subpattern with only one branch (in
190        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
191        computed the wrong minimum data length (which is of course zero for such
192        subpatterns). This could cause incorrect "no match" results.
193    
194    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
195        the pattern is reset in the first branch, pcre_compile() failed with
196        "internal error: code overflow at offset...". This happened only when
197        the reset was to the original external option setting. (An optimization
198        abstracts leading options settings into an external setting, which was the
199        cause of this.)
200    
201    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
202        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
203        assertion pattern did not match (meaning that the assertion was true), it
204        was incorrectly treated as false if the SKIP had been reached during the
205        matching. This also applied to assertions used as conditions.
206    
207    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
208        assertion subpattern, including such a pattern used as a condition,
209        unpredictable results occurred, instead of the error return
210        PCRE_ERROR_DFA_UITEM.
211    
212    5.  The C++ GlobalReplace function was not working like Perl for the special
213        situation when an empty string is matched. It now does the fancy magic
214        stuff that is necessary.
215    
216    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
217        removed. (These were left over from very, very early versions of PCRE.)
218    
219    7.  Some cosmetic changes to the code to make life easier when compiling it
220        as part of something else:
221    
222        (a) Change DEBUG to PCRE_DEBUG.
223    
224        (b) In pcre_compile(), rename the member of the "branch_chain" structure
225            called "current" as "current_branch", to prevent a collision with the
226            Linux macro when compiled as a kernel module.
227    
228        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
229            prevent a collision with the Linux macro when compiled as a kernel
230            module.
231    
232    8.  In pcre_compile() there are some checks for integer overflows that used to
233        cast potentially large values to (double). This has been changed to that
234        when building, a check for int64_t is made, and if it is found, it is used
235        instead, thus avoiding the use of floating point arithmetic. (There is no
236        other use of FP in PCRE.) If int64_t is not found, the fallback is to
237        double.
238    
239    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
240        2005 (difference between two addresses compared to an unsigned value).
241    
242    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
243        custom one, because of the following reported problem in Windows:
244    
245          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
246              under Win32.
247          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
248              therefore missing the function definition.
249          - The compiler thus generates a "C" signature for the test function.
250          - The linker fails to find the "C" function.
251          - PCRE fails to configure if asked to do so against libbz2.
252    
253    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
254        messages were output:
255    
256          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
257          rerunning libtoolize, to keep the correct libtool macros in-tree.
258          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
259    
260        I have done both of these things.
261    
262    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
263        most of the time, it *can* run out if it is given a pattern that contains a
264        runaway infinite recursion. I updated the discussion in the pcrestack man
265        page.
266    
267    13. Now that we have gone to the x.xx style of version numbers, the minor
268        version may start with zero. Using 08 or 09 is a bad idea because users
269        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
270        interpreted as invalid octal numbers. I've updated the previous comment in
271        configure.ac, and also added a check that gives an error if 08 or 09 are
272        used.
273    
274    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
275        causing partial matching to fail when the end of the subject matched \W
276        in a UTF-8 pattern where \W was quantified with a minimum of 3.
277    
278    15. There were some discrepancies between the declarations in pcre_internal.h
279        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
280        their definitions. The declarations used "const uschar *" and the
281        definitions used USPTR. Even though USPTR is normally defined as "const
282        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
283        reported that: "This difference in casting confuses some C++ compilers, for
284        example, SunCC recognizes above declarations as different functions and
285        generates broken code for hbpcre." I have changed the declarations to use
286        USPTR.
287    
288    16. GNU libtool is named differently on some systems. The autogen.sh script now
289        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
290        (FreeBSD).
291    
292    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
293        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
294        comment: "Figure out how to create a longlong from a string: strtoll and
295        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
296        instance, but it only takes 2 args instead of 3!"
297    
298    18. A subtle bug concerned with back references has been fixed by a change of
299        specification, with a corresponding code fix. A pattern such as
300        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
301        refers, was giving matches when it shouldn't. For example, xa=xaaa would
302        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
303        same bug. Such groups have to be quantified to be useful, or contained
304        inside another quantified group. (If there's no repetition, the reference
305        can never match.) The problem arises because, having left the group and
306        moved on to the rest of the pattern, a later failure that backtracks into
307        the group uses the captured value from the final iteration of the group
308        rather than the correct earlier one. I have fixed this in PCRE by forcing
309        any group that contains a reference to itself to be an atomic group; that
310        is, there cannot be any backtracking into it once it has completed. This is
311        similar to recursive and subroutine calls.
312    
313    
314    Version 8.00 19-Oct-09
315    ----------------------
316    
317    1.  The table for translating pcre_compile() error codes into POSIX error codes
318        was out-of-date, and there was no check on the pcre_compile() error code
319        being within the table. This could lead to an OK return being given in
320        error.
321    
322    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
323        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
324        in a Windows environment.
325    
326    3.  The pcregrep --count option prints the count for each file even when it is
327        zero, as does GNU grep. However, pcregrep was also printing all files when
328        --files-with-matches was added. Now, when both options are given, it prints
329        counts only for those files that have at least one match. (GNU grep just
330        prints the file name in this circumstance, but including the count seems
331        more useful - otherwise, why use --count?) Also ensured that the
332        combination -clh just lists non-zero counts, with no names.
333    
334    4.  The long form of the pcregrep -F option was incorrectly implemented as
335        --fixed_strings instead of --fixed-strings. This is an incompatible change,
336        but it seems right to fix it, and I didn't think it was worth preserving
337        the old behaviour.
338    
339    5.  The command line items --regex=pattern and --regexp=pattern were not
340        recognized by pcregrep, which required --regex pattern or --regexp pattern
341        (with a space rather than an '='). The man page documented the '=' forms,
342        which are compatible with GNU grep; these now work.
343    
344    6.  No libpcreposix.pc file was created for pkg-config; there was just
345        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
346    
347    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
348        when UCP support is not needed, by modifying the Python script that
349        generates it from Unicode data files. This should not matter if the module
350        is correctly used as a library, but I received one complaint about 50K of
351        unwanted data. My guess is that the person linked everything into his
352        program rather than using a library. Anyway, it does no harm.
353    
354    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
355        was a minimum greater than 1 for a wide character in a possessive
356        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
357        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
358        character. Chaos in the form of incorrect output or a compiling loop could
359        result.
360    
361    9.  The restrictions on what a pattern can contain when partial matching is
362        requested for pcre_exec() have been removed. All patterns can now be
363        partially matched by this function. In addition, if there are at least two
364        slots in the offset vector, the offset of the earliest inspected character
365        for the match and the offset of the end of the subject are set in them when
366        PCRE_ERROR_PARTIAL is returned.
367    
368    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
369        synonymous with PCRE_PARTIAL, for backwards compatibility, and
370        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
371        and may be more useful for multi-segment matching.
372    
373    11. Partial matching with pcre_exec() is now more intuitive. A partial match
374        used to be given if ever the end of the subject was reached; now it is
375        given only if matching could not proceed because another character was
376        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
377        string "Z", which now yields "no match" instead of "partial match". In the
378        case of pcre_dfa_exec(), "no match" is given if every matching path for the
379        final character ended with (*FAIL).
380    
381    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
382        if the pattern had a "must contain" character that was already found in the
383        earlier partial match, unless partial matching was again requested. For
384        example, with the pattern /dog.(body)?/, the "must contain" character is
385        "g". If the first part-match was for the string "dog", restarting with
386        "sbody" failed. This bug has been fixed.
387    
388    13. The string returned by pcre_dfa_exec() after a partial match has been
389        changed so that it starts at the first inspected character rather than the
390        first character of the match. This makes a difference only if the pattern
391        starts with a lookbehind assertion or \b or \B (\K is not supported by
392        pcre_dfa_exec()). It's an incompatible change, but it makes the two
393        matching functions compatible, and I think it's the right thing to do.
394    
395    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
396        so that the demonstration program is easily available in environments where
397        PCRE has not been installed from source.
398    
399    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
400        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
401        library.
402    
403    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
404        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
405        is not the first non-POSIX option to be added. Clearly some people find
406        these options useful.
407    
408    17. If a caller to the POSIX matching function regexec() passes a non-zero
409        value for nmatch with a NULL value for pmatch, the value of
410        nmatch is forced to zero.
411    
412    18. RunGrepTest did not have a test for the availability of the -u option of
413        the diff command, as RunTest does. It now checks in the same way as
414        RunTest, and also checks for the -b option.
415    
416    19. If an odd number of negated classes containing just a single character
417        interposed, within parentheses, between a forward reference to a named
418        subpattern and the definition of the subpattern, compilation crashed with
419        an internal error, complaining that it could not find the referenced
420        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
421        [The bug was that it was starting one character too far in when skipping
422        over the character class, thus treating the ] as data rather than
423        terminating the class. This meant it could skip too much.]
424    
425    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
426        /g option in pcretest when the pattern contains \K, which makes it possible
427        to have an empty string match not at the start, even when the pattern is
428        anchored. Updated pcretest and pcredemo to use this option.
429    
430    21. If the maximum number of capturing subpatterns in a recursion was greater
431        than the maximum at the outer level, the higher number was returned, but
432        with unset values at the outer level. The correct (outer level) value is
433        now given.
434    
435    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
436        PCRE did not set those parentheses (unlike Perl). I have now found a way to
437        make it do so. The string so far is captured, making this feature
438        compatible with Perl.
439    
440    23. The tests have been re-organized, adding tests 11 and 12, to make it
441        possible to check the Perl 5.10 features against Perl 5.10.
442    
443    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
444        pattern matches a fixed length string. PCRE did not allow this; now it
445        does. Neither allows recursion.
446    
447    25. I finally figured out how to implement a request to provide the minimum
448        length of subject string that was needed in order to match a given pattern.
449        (It was back references and recursion that I had previously got hung up
450        on.) This code has now been added to pcre_study(); it finds a lower bound
451        to the length of subject needed. It is not necessarily the greatest lower
452        bound, but using it to avoid searching strings that are too short does give
453        some useful speed-ups. The value is available to calling programs via
454        pcre_fullinfo().
455    
456    26. While implementing 25, I discovered to my embarrassment that pcretest had
457        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
458        study optimizations had never been tested with that matching function.
459        Oops. What is worse, even when it was passed study data, there was a bug in
460        pcre_dfa_exec() that meant it never actually used it. Double oops. There
461        were also very few tests of studied patterns with pcre_dfa_exec().
462    
463    27. If (?| is used to create subpatterns with duplicate numbers, they are now
464        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
465        on the other side of the coin, they are no longer allowed to have different
466        names, because these cannot be distinguished in PCRE, and this has caused
467        confusion. (This is a difference from Perl.)
468    
469    28. When duplicate subpattern names are present (necessarily with different
470        numbers, as required by 27 above), and a test is made by name in a
471        conditional pattern, either for a subpattern having been matched, or for
472        recursion in such a pattern, all the associated numbered subpatterns are
473        tested, and the overall condition is true if the condition is true for any
474        one of them. This is the way Perl works, and is also more like the way
475        testing by number works.
476    
477    
478    Version 7.9 11-Apr-09
479    ---------------------
480    
481    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
482        (pcretest), all targets were linked against these libraries. This included
483        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
484        libraries. This caused unwanted dependencies to be created. This problem
485        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
486        pcretest is linked with readline.
487    
488    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
489        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
490        moved outside it again, because FALSE and TRUE are already defined in AIX,
491        but BOOL is not.
492    
493    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
494        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
495    
496    4.  The pcregrep documentation said spaces were inserted as well as colons (or
497        hyphens) following file names and line numbers when outputting matching
498        lines. This is not true; no spaces are inserted. I have also clarified the
499        wording for the --colour (or --color) option.
500    
501    5.  In pcregrep, when --colour was used with -o, the list of matching strings
502        was not coloured; this is different to GNU grep, so I have changed it to be
503        the same.
504    
505    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
506        each matching line was coloured. Now it goes on to look for further matches
507        of any of the test patterns, which is the same behaviour as GNU grep.
508    
509    7.  A pattern that could match an empty string could cause pcregrep to loop; it
510        doesn't make sense to accept an empty string match in pcregrep, so I have
511        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
512        seems to be how GNU grep behaves.
513    
514    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
515        start or after a newline", because the conditional assertion was not being
516        correctly handled. The rule now is that both the assertion and what follows
517        in the first alternative must satisfy the test.
518    
519    9.  If auto-callout was enabled in a pattern with a conditional group whose
520        condition was an assertion, PCRE could crash during matching, both with
521        pcre_exec() and pcre_dfa_exec().
522    
523    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
524        used for matching.
525    
526    11. Unicode property support in character classes was not working for
527        characters (bytes) greater than 127 when not in UTF-8 mode.
528    
529    12. Added the -M command line option to pcretest.
530    
531    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
532    
533    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
534    
535    16. Added comments and documentation about mis-use of no_arg in the C++
536        wrapper.
537    
538    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
539        from Martin Jerabek that uses macro names for all relevant character and
540        string constants.
541    
542    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
543        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
544        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
545        these, but not everybody uses configure.
546    
547    19. A conditional group that had only one branch was not being correctly
548        recognized as an item that could match an empty string. This meant that an
549        enclosing group might also not be so recognized, causing infinite looping
550        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
551        with the subject "ab", where knowledge that the repeated group can match
552        nothing is needed in order to break the loop.
553    
554    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
555        exec(), but without supplying a callout function, matching went wrong.
556    
557    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
558        leak if the size of the offset vector was greater than 30. When the vector
559        is smaller, the saved offsets during recursion go onto a local stack
560        vector, but for larger vectors malloc() is used. It was failing to free
561        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
562        error, in fact).
563    
564    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
565        heapframe that is used only when UTF-8 support is enabled. This caused no
566        problem, but was untidy.
567    
568    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
569        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
570        included within another project.
571    
572    24. Steven Van Ingelgem's patches to add more options to the CMake support,
573        slightly modified by me:
574    
575          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
576              not building pcregrep.
577    
578          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
579              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
580    
581    25. Forward references, both numeric and by name, in patterns that made use of
582        duplicate group numbers, could behave incorrectly or give incorrect errors,
583        because when scanning forward to find the reference group, PCRE was not
584        taking into account the duplicate group numbers. A pattern such as
585        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
586    
587    26. Changed a few more instances of "const unsigned char *" to USPTR, making
588        the feature of a custom pointer more persuasive (as requested by a user).
589    
590    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
591        pcretest.c, inside #ifndefs, because it seems they are sometimes already
592        pre-defined.
593    
594    28. Added support for (*UTF8) at the start of a pattern.
595    
596    29. Arrange for flags added by the "release type" setting in CMake to be shown
597        in the configuration summary.
598    
599    
600    Version 7.8 05-Sep-08
601  ---------------------  ---------------------
602    
603  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
604      than 255 (in UTF-8 mode, of course), caused a buffer overflow.      Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
605        stage table and inline lookup instead of a function, giving speed ups of 2
606        to 5 times on some simple patterns that I tested. Permission was given to
607        distribute the MultiStage2.py script that generates the tables (it's not in
608        the tarball, but is in the Subversion repository).
609    
610    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
611        scripts.
612    
613    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
614        a group with a zero qualifier. The result of the study could be incorrect,
615        or the function might crash, depending on the pattern.
616    
617    4.  Caseless matching was not working for non-ASCII characters in back
618        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
619        It now works when Unicode Property Support is available.
620    
621    5.  In pcretest, an escape such as \x{de} in the data was always generating
622        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
623        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
624        truncation.
625    
626    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
627    
628    7.  Added two (int) casts to pcregrep when printing the difference of two
629        pointers, in case they are 64-bit values.
630    
631    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
632        test 2 if it fails.
633    
634    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
635        and a #define of that name to empty if it is not externally set. This is to
636        allow users of MSVC to set it if necessary.
637    
638    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
639        the convenience functions in the pcre_get.c source file.
640    
641    11. An option change at the start of a pattern that had top-level alternatives
642        could cause overwriting and/or a crash. This command provoked a crash in
643        some environments:
644    
645          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
646    
647        This potential security problem was recorded as CVE-2008-2371.
648    
649    12. For a pattern where the match had to start at the beginning or immediately
650        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
651        pcre_dfa_exec() could read past the end of the passed subject if there was
652        no match. To help with detecting such bugs (e.g. with valgrind), I modified
653        pcretest so that it places the subject at the end of its malloc-ed buffer.
654    
655    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
656        exec() might read past the end of the data buffer in UTF-8 mode.
657    
658    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
659        the data contained the byte 0x85 as part of a UTF-8 character within its
660        first line. This applied both to normal and DFA matching.
661    
662    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
663        /^[^d]*?$/8 failed to match "abc".
664    
665    16. Added a missing copyright notice to pcrecpp_internal.h.
666    
667    17. Make it more clear in the documentation that values returned from
668        pcre_exec() in ovector are byte offsets, not character counts.
669    
670    18. Tidied a few places to stop certain compilers from issuing warnings.
671    
672    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
673        supplied by Stefan Weber. I made a further small update for 7.8 because
674        there is a change of source arrangements: the pcre_searchfuncs.c module is
675        replaced by pcre_ucd.c.
676    
677    
678    Version 7.7 07-May-08
679    ---------------------
680    
681    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
682        a string to a long long, pretend we don't even have a long long." This is
683        done by checking for the strtoq, strtoll, and _strtoi64 functions.
684    
685    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
686        pre-7.6 versions, which defined a global no_arg variable instead of putting
687        it in the RE class. (See also #8 below.)
688    
689    3.  Remove a line of dead code, identified by coverity and reported by Nuno
690        Lopes.
691    
692    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
693    
694        (1) The include/exclude patterns were being applied to the whole pathnames
695            of files, instead of just to the final components.
696    
697        (2) If there was more than one level of directory, the subdirectories were
698            skipped unless they satisfied the include/exclude conditions. This is
699            inconsistent with GNU grep (and could even be seen as contrary to the
700            pcregrep specification - which I improved to make it absolutely clear).
701            The action now is always to scan all levels of directory, and just
702            apply the include/exclude patterns to regular files.
703    
704    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
705        --exclude_dir in the tests to avoid scanning .svn directories.
706    
707    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
708        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
709        doesn't support NULs in patterns.
710    
711    7.  Added some missing "const"s to declarations of static tables in
712        pcre_compile.c and pcre_dfa_exec.c.
713    
714    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
715        caused by fix #2  above. (Subsequently also a second patch to fix the
716        first patch. And a third patch - this was a messy problem.)
717    
718    9.  Applied Craig's patch to remove the use of push_back().
719    
720    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
721        matching function regexec().
722    
723    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
724        which, however, unlike Perl's \g{...}, are subroutine calls, not back
725        references. PCRE supports relative numbers with this syntax (I don't think
726        Oniguruma does).
727    
728    12. Previously, a group with a zero repeat such as (...){0} was completely
729        omitted from the compiled regex. However, this means that if the group
730        was called as a subroutine from elsewhere in the pattern, things went wrong
731        (an internal error was given). Such groups are now left in the compiled
732        pattern, with a new opcode that causes them to be skipped at execution
733        time.
734    
735    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
736        to the way PCRE behaves:
737    
738        (a) A lone ] character is dis-allowed (Perl treats it as data).
739    
740        (b) A back reference to an unmatched subpattern matches an empty string
741            (Perl fails the current match path).
742    
743        (c) A data ] in a character class must be notated as \] because if the
744            first data character in a class is ], it defines an empty class. (In
745            Perl it is not possible to have an empty class.) The empty class []
746            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
747            The negative empty class [^] matches any one character, independently
748            of the DOTALL setting.
749    
750    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
751        non-existent subpattern following a character class starting with ']' and
752        containing () gave an internal compiling error instead of "reference to
753        non-existent subpattern". Fortunately, when the pattern did exist, the
754        compiled code was correct. (When scanning forwards to check for the
755        existencd of the subpattern, it was treating the data ']' as terminating
756        the class, so got the count wrong. When actually compiling, the reference
757        was subsequently set up correctly.)
758    
759    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
760        it was being rejected as not supported by pcre_dfa_exec(), even though
761        other assertions are supported. I have made pcre_dfa_exec() support
762        (*FAIL).
763    
764    16. The implementation of 13c above involved the invention of a new opcode,
765        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
766        cannot be changed at match time, I realized I could make a small
767        improvement to matching performance by compiling OP_ALLANY instead of
768        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
769        on the OP_ANY path.
770    
771    17. Compiling pcretest on Windows with readline support failed without the
772        following two fixes: (1) Make the unistd.h include conditional on
773        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
774    
775    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
776        ncurses library to be included for pcretest when ReadLine support is
777        requested, but also to allow for it to be overridden. This patch came from
778        Daniel Bergström.
779    
780    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
781        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
782        any errors with the current Unicode tables. Thanks to Peter Kankowski for
783        spotting this.
784    
785    
786    Version 7.6 28-Jan-08
787    ---------------------
788    
789    1.  A character class containing a very large number of characters with
790        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
791        overflow.
792    
793    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
794        HAVE_LONG_LONG is not defined.
795    
796    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
797        bring them up to date and include new features. This patch includes:
798    
799        - Fixed PH's badly added libz and libbz2 support.
800        - Fixed a problem with static linking.
801        - Added pcredemo. [But later removed - see 7 below.]
802        - Fixed dftables problem and added an option.
803        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
804            HAVE_LONG_LONG.
805        - Added readline support for pcretest.
806        - Added an listing of the option settings after cmake has run.
807    
808    4.  A user submitted a patch to Makefile that makes it easy to create
809        "pcre.dll" under mingw when using Configure/Make. I added stuff to
810        Makefile.am that cause it to include this special target, without
811        affecting anything else. Note that the same mingw target plus all
812        the other distribution libraries and programs are now supported
813        when configuring with CMake (see 6 below) instead of with
814        Configure/Make.
815    
816    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
817        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
818        exported in the Windows port". It has not yet been confirmed that the patch
819        solves the problem, but it does no harm.
820    
821    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
822        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
823        with CMake, and also correct the comment about stack recursion.
824    
825    7.  Remove the automatic building of pcredemo from the ./configure system and
826        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
827        of a program that users should build themselves after PCRE is installed, so
828        building it automatically is not really right. What is more, it gave
829        trouble in some build environments.
830    
831    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
832    
833    
834  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
835  ---------------------  ---------------------

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