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revision 351 by ph10, Fri Jul 4 18:27:16 2008 UTC revision 556 by ph10, Tue Oct 26 11:06:44 2010 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.0 02 Jul-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    4.  A partial match never returns an empty string (because you can always
26        match an empty string at the end of the subject); however the checking for
27        an empty string was starting at the "start of match" point. This has been
28        changed to the "earliest inspected character" point, because the returned
29        data for a partial match starts at this character. This means that, for
30        example, /(?<=abc)def/ gives a partial match for the subject "abc"
31        (previously it gave "no match").
32    
33    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
34        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
35        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
36        has an implication that the given string is incomplete (because a partial
37        match is preferred over a full match). For this reason, these items now
38        give a partial match in this situation. [Aside: previously, the one case
39        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
40        match rather than a full match, which was wrong by the old rules, but is
41        now correct.]
42    
43    6.  There was a bug in the handling of #-introduced comments, recognized when
44        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
45        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
46        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
47        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
48        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
49        places in pcre_compile().
50    
51    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
52        comments when looking ahead for named forward references to subpatterns,
53        the only newline sequence it recognized was NL. It now handles newlines
54        according to the set newline convention.
55    
56    
57    Version 8.10 25-Jun-2010
58    ------------------------
59    
60    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
61        THEN.
62    
63    2.  (*ACCEPT) was not working when inside an atomic group.
64    
65    3.  Inside a character class, \B is treated as a literal by default, but
66        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
67        causes the error). The code is unchanged, but I tidied the documentation.
68    
69    4.  Inside a character class, PCRE always treated \R and \X as literals,
70        whereas Perl faults them if its -w option is set. I have changed PCRE so
71        that it faults them when PCRE_EXTRA is set.
72    
73    5.  Added support for \N, which always matches any character other than
74        newline. (It is the same as "." when PCRE_DOTALL is not set.)
75    
76    6.  When compiling pcregrep with newer versions of gcc which may have
77        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
78        declared with attribute warn_unused_result" were given. Just casting the
79        result to (void) does not stop the warnings; a more elaborate fudge is
80        needed. I've used a macro to implement this.
81    
82    7.  Minor change to pcretest.c to avoid a compiler warning.
83    
84    8.  Added four artifical Unicode properties to help with an option to make
85        \s etc use properties (see next item). The new properties are: Xan
86        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
87    
88    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
89        use Unicode properties. (*UCP) at the start of a pattern can be used to set
90        this option. Modified pcretest to add /W to test this facility. Added
91        REG_UCP to make it available via the POSIX interface.
92    
93    10. Added --line-buffered to pcregrep.
94    
95    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
96        studied, and the match started with a letter with a code point greater than
97        127 whose first byte was different to the first byte of the other case of
98        the letter, the other case of this starting letter was not recognized
99        (#976).
100    
101    12. If a pattern that was studied started with a repeated Unicode property
102        test, for example, \p{Nd}+, there was the theoretical possibility of
103        setting up an incorrect bitmap of starting bytes, but fortunately it could
104        not have actually happened in practice until change 8 above was made (it
105        added property types that matched character-matching opcodes).
106    
107    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
108        possible starting bytes for non-anchored patterns.
109    
110    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
111        \R, and also a number of cases that involve Unicode properties, both
112        explicit and implicit when PCRE_UCP is set.
113    
114    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
115        input, it could crash or give wrong results if characters with values
116        greater than 0xc0 were present in the subject string. (Detail: it assumed
117        UTF-8 input when processing these items.)
118    
119    16. Added a lot of (int) casts to avoid compiler warnings in systems where
120        size_t is 64-bit (#991).
121    
122    17. Added a check for running out of memory when PCRE is compiled with
123        --disable-stack-for-recursion (#990).
124    
125    18. If the last data line in a file for pcretest does not have a newline on
126        the end, a newline was missing in the output.
127    
128    19. The default pcre_chartables.c file recognizes only ASCII characters (values
129        less than 128) in its various bitmaps. However, there is a facility for
130        generating tables according to the current locale when PCRE is compiled. It
131        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
132        characters, are recognized by isspace() and therefore were getting set in
133        these tables, and indeed these tables seem to approximate to ISO 8859. This
134        caused a problem in UTF-8 mode when pcre_study() was used to create a list
135        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
136        which of course cannot start UTF-8 characters. I have changed the code so
137        that only real ASCII characters (less than 128) and the correct starting
138        bytes for UTF-8 encodings are set for characters greater than 127 when in
139        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
140        altogether.)
141    
142    20. Added the /T option to pcretest so as to be able to run tests with non-
143        standard character tables, thus making it possible to include the tests
144        used for 19 above in the standard set of tests.
145    
146    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
147        reference to a subpattern the other side of a comment that contains an
148        opening parenthesis caused either an internal compiling error, or a
149        reference to the wrong subpattern.
150    
151    
152    Version 8.02 19-Mar-2010
153    ------------------------
154    
155    1.  The Unicode data tables have been updated to Unicode 5.2.0.
156    
157    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
158        configured.
159    
160    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
161        original author of that file, following a query about its status.
162    
163    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
164        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
165    
166    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
167        quantifier applied to a forward-referencing subroutine call, could compile
168        incorrect code or give the error "internal error: previously-checked
169        referenced subpattern not found".
170    
171    6.  Both MS Visual Studio and Symbian OS have problems with initializing
172        variables to point to external functions. For these systems, therefore,
173        pcre_malloc etc. are now initialized to local functions that call the
174        relevant global functions.
175    
176    7.  There were two entries missing in the vectors called coptable and poptable
177        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
178        I've fixed the data, and added a kludgy way of testing at compile time that
179        the lengths are correct (equal to the number of opcodes).
180    
181    8.  Following on from 7, I added a similar kludge to check the length of the
182        eint vector in pcreposix.c.
183    
184    9.  Error texts for pcre_compile() are held as one long string to avoid too
185        much relocation at load time. To find a text, the string is searched,
186        counting zeros. There was no check for running off the end of the string,
187        which could happen if a new error number was added without updating the
188        string.
189    
190    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
191    
192    11. \K was not working if it appeared in an atomic group or in a group that
193        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
194        \K is "not well defined" if used in an assertion. PCRE now accepts it if
195        the assertion is positive, but not if it is negative.
196    
197    12. Change 11 fortuitously reduced the size of the stack frame used in the
198        "match()" function of pcre_exec.c by one pointer. Forthcoming
199        implementation of support for (*MARK) will need an extra pointer on the
200        stack; I have reserved it now, so that the stack frame size does not
201        decrease.
202    
203    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
204        item in branch that calls a recursion is a subroutine call - as in the
205        second branch in the above example - was incorrectly given the compile-
206        time error "recursive call could loop indefinitely" because pcre_compile()
207        was not correctly checking the subroutine for matching a non-empty string.
208    
209    14. The checks for overrunning compiling workspace could trigger after an
210        overrun had occurred. This is a "should never occur" error, but it can be
211        triggered by pathological patterns such as hundreds of nested parentheses.
212        The checks now trigger 100 bytes before the end of the workspace.
213    
214    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
215    
216    
217    Version 8.01 19-Jan-2010
218    ------------------------
219    
220    1.  If a pattern contained a conditional subpattern with only one branch (in
221        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
222        computed the wrong minimum data length (which is of course zero for such
223        subpatterns). This could cause incorrect "no match" results.
224    
225    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
226        the pattern is reset in the first branch, pcre_compile() failed with
227        "internal error: code overflow at offset...". This happened only when
228        the reset was to the original external option setting. (An optimization
229        abstracts leading options settings into an external setting, which was the
230        cause of this.)
231    
232    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
233        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
234        assertion pattern did not match (meaning that the assertion was true), it
235        was incorrectly treated as false if the SKIP had been reached during the
236        matching. This also applied to assertions used as conditions.
237    
238    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
239        assertion subpattern, including such a pattern used as a condition,
240        unpredictable results occurred, instead of the error return
241        PCRE_ERROR_DFA_UITEM.
242    
243    5.  The C++ GlobalReplace function was not working like Perl for the special
244        situation when an empty string is matched. It now does the fancy magic
245        stuff that is necessary.
246    
247    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
248        removed. (These were left over from very, very early versions of PCRE.)
249    
250    7.  Some cosmetic changes to the code to make life easier when compiling it
251        as part of something else:
252    
253        (a) Change DEBUG to PCRE_DEBUG.
254    
255        (b) In pcre_compile(), rename the member of the "branch_chain" structure
256            called "current" as "current_branch", to prevent a collision with the
257            Linux macro when compiled as a kernel module.
258    
259        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
260            prevent a collision with the Linux macro when compiled as a kernel
261            module.
262    
263    8.  In pcre_compile() there are some checks for integer overflows that used to
264        cast potentially large values to (double). This has been changed to that
265        when building, a check for int64_t is made, and if it is found, it is used
266        instead, thus avoiding the use of floating point arithmetic. (There is no
267        other use of FP in PCRE.) If int64_t is not found, the fallback is to
268        double.
269    
270    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
271        2005 (difference between two addresses compared to an unsigned value).
272    
273    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
274        custom one, because of the following reported problem in Windows:
275    
276          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
277              under Win32.
278          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
279              therefore missing the function definition.
280          - The compiler thus generates a "C" signature for the test function.
281          - The linker fails to find the "C" function.
282          - PCRE fails to configure if asked to do so against libbz2.
283    
284    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
285        messages were output:
286    
287          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
288          rerunning libtoolize, to keep the correct libtool macros in-tree.
289          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
290    
291        I have done both of these things.
292    
293    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
294        most of the time, it *can* run out if it is given a pattern that contains a
295        runaway infinite recursion. I updated the discussion in the pcrestack man
296        page.
297    
298    13. Now that we have gone to the x.xx style of version numbers, the minor
299        version may start with zero. Using 08 or 09 is a bad idea because users
300        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
301        interpreted as invalid octal numbers. I've updated the previous comment in
302        configure.ac, and also added a check that gives an error if 08 or 09 are
303        used.
304    
305    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
306        causing partial matching to fail when the end of the subject matched \W
307        in a UTF-8 pattern where \W was quantified with a minimum of 3.
308    
309    15. There were some discrepancies between the declarations in pcre_internal.h
310        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
311        their definitions. The declarations used "const uschar *" and the
312        definitions used USPTR. Even though USPTR is normally defined as "const
313        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
314        reported that: "This difference in casting confuses some C++ compilers, for
315        example, SunCC recognizes above declarations as different functions and
316        generates broken code for hbpcre." I have changed the declarations to use
317        USPTR.
318    
319    16. GNU libtool is named differently on some systems. The autogen.sh script now
320        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
321        (FreeBSD).
322    
323    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
324        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
325        comment: "Figure out how to create a longlong from a string: strtoll and
326        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
327        instance, but it only takes 2 args instead of 3!"
328    
329    18. A subtle bug concerned with back references has been fixed by a change of
330        specification, with a corresponding code fix. A pattern such as
331        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
332        refers, was giving matches when it shouldn't. For example, xa=xaaa would
333        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
334        same bug. Such groups have to be quantified to be useful, or contained
335        inside another quantified group. (If there's no repetition, the reference
336        can never match.) The problem arises because, having left the group and
337        moved on to the rest of the pattern, a later failure that backtracks into
338        the group uses the captured value from the final iteration of the group
339        rather than the correct earlier one. I have fixed this in PCRE by forcing
340        any group that contains a reference to itself to be an atomic group; that
341        is, there cannot be any backtracking into it once it has completed. This is
342        similar to recursive and subroutine calls.
343    
344    
345    Version 8.00 19-Oct-09
346    ----------------------
347    
348    1.  The table for translating pcre_compile() error codes into POSIX error codes
349        was out-of-date, and there was no check on the pcre_compile() error code
350        being within the table. This could lead to an OK return being given in
351        error.
352    
353    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
354        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
355        in a Windows environment.
356    
357    3.  The pcregrep --count option prints the count for each file even when it is
358        zero, as does GNU grep. However, pcregrep was also printing all files when
359        --files-with-matches was added. Now, when both options are given, it prints
360        counts only for those files that have at least one match. (GNU grep just
361        prints the file name in this circumstance, but including the count seems
362        more useful - otherwise, why use --count?) Also ensured that the
363        combination -clh just lists non-zero counts, with no names.
364    
365    4.  The long form of the pcregrep -F option was incorrectly implemented as
366        --fixed_strings instead of --fixed-strings. This is an incompatible change,
367        but it seems right to fix it, and I didn't think it was worth preserving
368        the old behaviour.
369    
370    5.  The command line items --regex=pattern and --regexp=pattern were not
371        recognized by pcregrep, which required --regex pattern or --regexp pattern
372        (with a space rather than an '='). The man page documented the '=' forms,
373        which are compatible with GNU grep; these now work.
374    
375    6.  No libpcreposix.pc file was created for pkg-config; there was just
376        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
377    
378    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
379        when UCP support is not needed, by modifying the Python script that
380        generates it from Unicode data files. This should not matter if the module
381        is correctly used as a library, but I received one complaint about 50K of
382        unwanted data. My guess is that the person linked everything into his
383        program rather than using a library. Anyway, it does no harm.
384    
385    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
386        was a minimum greater than 1 for a wide character in a possessive
387        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
388        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
389        character. Chaos in the form of incorrect output or a compiling loop could
390        result.
391    
392    9.  The restrictions on what a pattern can contain when partial matching is
393        requested for pcre_exec() have been removed. All patterns can now be
394        partially matched by this function. In addition, if there are at least two
395        slots in the offset vector, the offset of the earliest inspected character
396        for the match and the offset of the end of the subject are set in them when
397        PCRE_ERROR_PARTIAL is returned.
398    
399    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
400        synonymous with PCRE_PARTIAL, for backwards compatibility, and
401        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
402        and may be more useful for multi-segment matching.
403    
404    11. Partial matching with pcre_exec() is now more intuitive. A partial match
405        used to be given if ever the end of the subject was reached; now it is
406        given only if matching could not proceed because another character was
407        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
408        string "Z", which now yields "no match" instead of "partial match". In the
409        case of pcre_dfa_exec(), "no match" is given if every matching path for the
410        final character ended with (*FAIL).
411    
412    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
413        if the pattern had a "must contain" character that was already found in the
414        earlier partial match, unless partial matching was again requested. For
415        example, with the pattern /dog.(body)?/, the "must contain" character is
416        "g". If the first part-match was for the string "dog", restarting with
417        "sbody" failed. This bug has been fixed.
418    
419    13. The string returned by pcre_dfa_exec() after a partial match has been
420        changed so that it starts at the first inspected character rather than the
421        first character of the match. This makes a difference only if the pattern
422        starts with a lookbehind assertion or \b or \B (\K is not supported by
423        pcre_dfa_exec()). It's an incompatible change, but it makes the two
424        matching functions compatible, and I think it's the right thing to do.
425    
426    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
427        so that the demonstration program is easily available in environments where
428        PCRE has not been installed from source.
429    
430    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
431        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
432        library.
433    
434    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
435        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
436        is not the first non-POSIX option to be added. Clearly some people find
437        these options useful.
438    
439    17. If a caller to the POSIX matching function regexec() passes a non-zero
440        value for nmatch with a NULL value for pmatch, the value of
441        nmatch is forced to zero.
442    
443    18. RunGrepTest did not have a test for the availability of the -u option of
444        the diff command, as RunTest does. It now checks in the same way as
445        RunTest, and also checks for the -b option.
446    
447    19. If an odd number of negated classes containing just a single character
448        interposed, within parentheses, between a forward reference to a named
449        subpattern and the definition of the subpattern, compilation crashed with
450        an internal error, complaining that it could not find the referenced
451        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
452        [The bug was that it was starting one character too far in when skipping
453        over the character class, thus treating the ] as data rather than
454        terminating the class. This meant it could skip too much.]
455    
456    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
457        /g option in pcretest when the pattern contains \K, which makes it possible
458        to have an empty string match not at the start, even when the pattern is
459        anchored. Updated pcretest and pcredemo to use this option.
460    
461    21. If the maximum number of capturing subpatterns in a recursion was greater
462        than the maximum at the outer level, the higher number was returned, but
463        with unset values at the outer level. The correct (outer level) value is
464        now given.
465    
466    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
467        PCRE did not set those parentheses (unlike Perl). I have now found a way to
468        make it do so. The string so far is captured, making this feature
469        compatible with Perl.
470    
471    23. The tests have been re-organized, adding tests 11 and 12, to make it
472        possible to check the Perl 5.10 features against Perl 5.10.
473    
474    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
475        pattern matches a fixed length string. PCRE did not allow this; now it
476        does. Neither allows recursion.
477    
478    25. I finally figured out how to implement a request to provide the minimum
479        length of subject string that was needed in order to match a given pattern.
480        (It was back references and recursion that I had previously got hung up
481        on.) This code has now been added to pcre_study(); it finds a lower bound
482        to the length of subject needed. It is not necessarily the greatest lower
483        bound, but using it to avoid searching strings that are too short does give
484        some useful speed-ups. The value is available to calling programs via
485        pcre_fullinfo().
486    
487    26. While implementing 25, I discovered to my embarrassment that pcretest had
488        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
489        study optimizations had never been tested with that matching function.
490        Oops. What is worse, even when it was passed study data, there was a bug in
491        pcre_dfa_exec() that meant it never actually used it. Double oops. There
492        were also very few tests of studied patterns with pcre_dfa_exec().
493    
494    27. If (?| is used to create subpatterns with duplicate numbers, they are now
495        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
496        on the other side of the coin, they are no longer allowed to have different
497        names, because these cannot be distinguished in PCRE, and this has caused
498        confusion. (This is a difference from Perl.)
499    
500    28. When duplicate subpattern names are present (necessarily with different
501        numbers, as required by 27 above), and a test is made by name in a
502        conditional pattern, either for a subpattern having been matched, or for
503        recursion in such a pattern, all the associated numbered subpatterns are
504        tested, and the overall condition is true if the condition is true for any
505        one of them. This is the way Perl works, and is also more like the way
506        testing by number works.
507    
508    
509    Version 7.9 11-Apr-09
510    ---------------------
511    
512    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
513        (pcretest), all targets were linked against these libraries. This included
514        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
515        libraries. This caused unwanted dependencies to be created. This problem
516        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
517        pcretest is linked with readline.
518    
519    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
520        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
521        moved outside it again, because FALSE and TRUE are already defined in AIX,
522        but BOOL is not.
523    
524    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
525        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
526    
527    4.  The pcregrep documentation said spaces were inserted as well as colons (or
528        hyphens) following file names and line numbers when outputting matching
529        lines. This is not true; no spaces are inserted. I have also clarified the
530        wording for the --colour (or --color) option.
531    
532    5.  In pcregrep, when --colour was used with -o, the list of matching strings
533        was not coloured; this is different to GNU grep, so I have changed it to be
534        the same.
535    
536    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
537        each matching line was coloured. Now it goes on to look for further matches
538        of any of the test patterns, which is the same behaviour as GNU grep.
539    
540    7.  A pattern that could match an empty string could cause pcregrep to loop; it
541        doesn't make sense to accept an empty string match in pcregrep, so I have
542        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
543        seems to be how GNU grep behaves.
544    
545    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
546        start or after a newline", because the conditional assertion was not being
547        correctly handled. The rule now is that both the assertion and what follows
548        in the first alternative must satisfy the test.
549    
550    9.  If auto-callout was enabled in a pattern with a conditional group whose
551        condition was an assertion, PCRE could crash during matching, both with
552        pcre_exec() and pcre_dfa_exec().
553    
554    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
555        used for matching.
556    
557    11. Unicode property support in character classes was not working for
558        characters (bytes) greater than 127 when not in UTF-8 mode.
559    
560    12. Added the -M command line option to pcretest.
561    
562    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
563    
564    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
565    
566    16. Added comments and documentation about mis-use of no_arg in the C++
567        wrapper.
568    
569    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
570        from Martin Jerabek that uses macro names for all relevant character and
571        string constants.
572    
573    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
574        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
575        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
576        these, but not everybody uses configure.
577    
578    19. A conditional group that had only one branch was not being correctly
579        recognized as an item that could match an empty string. This meant that an
580        enclosing group might also not be so recognized, causing infinite looping
581        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
582        with the subject "ab", where knowledge that the repeated group can match
583        nothing is needed in order to break the loop.
584    
585    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
586        exec(), but without supplying a callout function, matching went wrong.
587    
588    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
589        leak if the size of the offset vector was greater than 30. When the vector
590        is smaller, the saved offsets during recursion go onto a local stack
591        vector, but for larger vectors malloc() is used. It was failing to free
592        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
593        error, in fact).
594    
595    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
596        heapframe that is used only when UTF-8 support is enabled. This caused no
597        problem, but was untidy.
598    
599    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
600        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
601        included within another project.
602    
603    24. Steven Van Ingelgem's patches to add more options to the CMake support,
604        slightly modified by me:
605    
606          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
607              not building pcregrep.
608    
609          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
610              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
611    
612    25. Forward references, both numeric and by name, in patterns that made use of
613        duplicate group numbers, could behave incorrectly or give incorrect errors,
614        because when scanning forward to find the reference group, PCRE was not
615        taking into account the duplicate group numbers. A pattern such as
616        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
617    
618    26. Changed a few more instances of "const unsigned char *" to USPTR, making
619        the feature of a custom pointer more persuasive (as requested by a user).
620    
621    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
622        pcretest.c, inside #ifndefs, because it seems they are sometimes already
623        pre-defined.
624    
625    28. Added support for (*UTF8) at the start of a pattern.
626    
627    29. Arrange for flags added by the "release type" setting in CMake to be shown
628        in the configuration summary.
629    
630    
631    Version 7.8 05-Sep-08
632  ---------------------  ---------------------
633    
634  1.  Replaced UCP searching code with optimized version as implemented for Ad  1.  Replaced UCP searching code with optimized version as implemented for Ad
# Line 14  Version 8.0 02 Jul-08 Line 641  Version 8.0 02 Jul-08
641  2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more  2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
642      scripts.      scripts.
643    
644    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
645        a group with a zero qualifier. The result of the study could be incorrect,
646        or the function might crash, depending on the pattern.
647    
648    4.  Caseless matching was not working for non-ASCII characters in back
649        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
650        It now works when Unicode Property Support is available.
651    
652    5.  In pcretest, an escape such as \x{de} in the data was always generating
653        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
654        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
655        truncation.
656    
657    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
658    
659    7.  Added two (int) casts to pcregrep when printing the difference of two
660        pointers, in case they are 64-bit values.
661    
662    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
663        test 2 if it fails.
664    
665    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
666        and a #define of that name to empty if it is not externally set. This is to
667        allow users of MSVC to set it if necessary.
668    
669    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
670        the convenience functions in the pcre_get.c source file.
671    
672    11. An option change at the start of a pattern that had top-level alternatives
673        could cause overwriting and/or a crash. This command provoked a crash in
674        some environments:
675    
676          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
677    
678        This potential security problem was recorded as CVE-2008-2371.
679    
680    12. For a pattern where the match had to start at the beginning or immediately
681        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
682        pcre_dfa_exec() could read past the end of the passed subject if there was
683        no match. To help with detecting such bugs (e.g. with valgrind), I modified
684        pcretest so that it places the subject at the end of its malloc-ed buffer.
685    
686    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
687        exec() might read past the end of the data buffer in UTF-8 mode.
688    
689    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
690        the data contained the byte 0x85 as part of a UTF-8 character within its
691        first line. This applied both to normal and DFA matching.
692    
693    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
694        /^[^d]*?$/8 failed to match "abc".
695    
696    16. Added a missing copyright notice to pcrecpp_internal.h.
697    
698    17. Make it more clear in the documentation that values returned from
699        pcre_exec() in ovector are byte offsets, not character counts.
700    
701    18. Tidied a few places to stop certain compilers from issuing warnings.
702    
703    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
704        supplied by Stefan Weber. I made a further small update for 7.8 because
705        there is a change of source arrangements: the pcre_searchfuncs.c module is
706        replaced by pcre_ucd.c.
707    
708    
709  Version 7.7 07-May-08  Version 7.7 07-May-08
710  ---------------------  ---------------------

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