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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 8.13 30-Apr-2011
5    ------------------------
6    
7    1.  The Unicode data tables have been updated to Unicode 6.0.0.
8    
9    2.  Two minor typos in pcre_internal.h have been fixed.
10    
11    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
12        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
13        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
14    
15    4.  There were a number of related bugs in the code for matching backrefences
16        caselessly in UTF-8 mode when codes for the characters concerned were
17        different numbers of bytes. For example, U+023A and U+2C65 are an upper
18        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
19        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
20        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
21        2-byte code at the end of the subject (it thought there wasn't enough data
22        left).
23    
24    5.  Comprehensive information about what went wrong is now returned by
25        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
26        as the output vector has at least 2 elements. The offset of the start of
27        the failing character and a reason code are placed in the vector.
28    
29    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
30        now returned is for the first byte of the failing character, instead of the
31        last byte inspected. This is an incompatible change, but I hope it is small
32        enough not to be a problem. It makes the returned offset consistent with
33        pcre_exec() and pcre_dfa_exec().
34    
35    7.  pcretest now gives a text phrase as well as the error number when
36        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
37        failure, the offset and reason code are output.
38    
39    8.  When \R was used with a maximizing quantifier it failed to skip backwards
40        over a \r\n pair if the subsequent match failed. Instead, it just skipped
41        back over a single character (\n). This seems wrong (because it treated the
42        two characters as a single entity when going forwards), conflicts with the
43        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
44        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
45        has been changed.
46    
47    9.  Some internal refactoring has changed the processing so that the handling
48        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
49        time (the PCRE_DOTALL option was changed this way some time ago: version
50        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
51        which was always a bit of a fudge. It also means that there is one less
52        argument for the match() function, which reduces its stack requirements
53        slightly. This change also fixes an incompatibility with Perl: the pattern
54        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
55    
56    10. More internal refactoring has drastically reduced the number of recursive
57        calls to match() for possessively repeated groups such as (abc)++ when
58        using pcre_exec().
59    
60    11. While implementing 10, a number of bugs in the handling of groups were
61        discovered and fixed:
62    
63        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
64        (a|)*(?1) gave a compile-time internal error.
65        ((a|)+)+  did not notice that the outer group could match an empty string.
66        (^a|^)+   was not marked as anchored.
67        (.*a|.*)+ was not marked as matching at start or after a newline.
68    
69    12. Yet more internal refactoring has removed another argument from the match()
70        function. Special calls to this function are now indicated by setting a
71        value in a variable in the "match data" data block.
72    
73    13. Be more explicit in pcre_study() instead of relying on "default" for
74        opcodes that mean there is no starting character; this means that when new
75        ones are added and accidentally left out of pcre_study(), testing should
76        pick them up.
77    
78    14. The -s option of pcretest has been documented for ages as being an old
79        synonym of -m (show memory usage). I have changed it to mean "force study
80        for every regex", that is, assume /S for every regex. This is similar to -i
81        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
82        using it. It makes it easier to run collections of tests with and without
83        study enabled, and thereby test pcre_study() more easily. All the standard
84        tests are now run with and without -s (but some patterns can be marked as
85        "never study" - see 20 below).
86    
87    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
88        restoration of the capturing data to the outer values was not happening
89        correctly.
90    
91    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
92        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
93        pattern had matched an empty string, and so incorrectly returned a no
94        match.
95    
96    17. There was optimizing code for the last branch of non-capturing parentheses,
97        and also for the obeyed branch of a conditional subexpression, which used
98        tail recursion to cut down on stack usage. Unfortunately, not that there is
99        the possibility of (*THEN) occurring in these branches, tail recursion is
100        no longer possible because the return has to be checked for (*THEN). These
101        two optimizations have therefore been removed.
102    
103    18. If a pattern containing \R was studied, it was assumed that \R always
104        matched two bytes, thus causing the minimum subject length to be
105        incorrectly computed because \R can also match just one byte.
106    
107    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
108        was incorrectly computed.
109    
110    20. If /S is present twice on a test pattern in pcretest input, it *disables*
111        studying, thereby overriding the use of -s on the command line. This is
112        necessary for one or two tests to keep the output identical in both cases.
113    
114    21. When (*ACCEPT) was used in an assertion that matched an empty string and
115        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
116    
117    22. When an atomic group that contained a capturing parenthesis was
118        successfully matched, but the branch in which it appeared failed, the
119        capturing was not being forgotten if a higher numbered group was later
120        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
121        group 1 to "a", when in fact it should be unset. This applied to multi-
122        branched capturing and non-capturing groups, repeated or not, and also to
123        positive assertions (capturing in negative assertions is not well defined
124        in PCRE) and also to nested atomic groups.
125    
126    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
127        subject after a captured substring (to make it easier to tell which of a
128        number of identical substrings has been captured).
129    
130    24. The way atomic groups are processed by pcre_exec() has been changed so that
131        if they are repeated, backtracking one repetition now resets captured
132        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
133        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
134        "aaa". Previously, it would have been "a". As part of this code
135        refactoring, the way recursive calls are handled has also been changed.
136    
137    24. If an assertion condition captured any substrings, they were not passed
138        back unless some other capturing happened later. For example, if
139        (?(?=(a))a) was matched against "a", no capturing was returned.
140    
141    25. When studying a pattern that contained subroutine calls or assertions,
142        the code for finding the minimum length of a possible match was handling
143        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
144        group 1 called group 2 while simultaneously a separate group 2 called group
145        1). A stack overflow occurred in this case. I have fixed this by limiting
146        the recursion depth to 10.
147    
148    26. Updated RunTest.bat in the distribution to the version supplied by Tom
149        Fortmann. This supports explicit test numbers on the command line, and has
150        argument validation and error reporting.
151    
152    27. An instance of \X with an unlimited repeat could fail if at any point the
153        first character it looked at was a mark character.
154    
155    28. Some minor code refactoring concerning Unicode properties and scripts
156        should reduce the stack requirement of match() slightly.
157    
158    29. Added the '=' option to pcretest to check the setting of unused capturing
159        slots at the end of the pattern, which are documented as being -1, but are
160        not included in the return count.
161    
162    30. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
163        compiled something random. Now it gives a compile-time error (as does
164        Perl).
165    
166    31. A *MARK encountered during the processing of a positive assertion is now
167        recorded and passed back (compatible with Perl).
168    
169    32. If --only-matching or --colour was set on a pcregrep call whose pattern
170        had alternative anchored branches, the search for a second match in a line
171        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
172        matched the line "0102" twice. The same bug affected patterns that started
173        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
174        twice.
175    
176    33. Previously, PCRE did not allow quantification of assertions. However, Perl
177        does, and because of capturing effects, quantifying parenthesized
178        assertions may at times be useful. Quantifiers are now allowed for
179        parenthesized assertions.
180    
181    34. A minor code tidy in pcre_compile() when checking options for \R usage.
182    
183    35. \g was being checked for fancy things in a character class, when it should
184        just be a literal "g".
185    
186    36. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
187        appearance of a nested POSIX class supersedes an apparent external class.
188        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
189        unescaped square brackets may also appear as part of class names. For
190        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
191        more like Perl.
192    
193    37. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
194        was because it thought it was \N{name}, which is not supported).
195    
196    38. Add minix to OS list not supporting the -S option in pcretest.
197    
198    39. PCRE tries to detect cases of infinite recursion at compile time, but it
199        cannot analyze patterns in sufficient detail to catch mutual recursions
200        such as ((?1))((?2)). There is now a runtime test that gives an error if a
201        subgroup is called recursively as a subpattern for a second time at the
202        same position in the subject string. In previous releases this might have
203        been caught by the recursion limit, or it might have run out of stack.
204    
205    40. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
206        happen only once. PCRE was, however incorrectly giving a compile time error
207        "recursive call could loop indefinitely" because it cannot analyze the
208        pattern in sufficient detail. The compile time test no longer happens when
209        PCRE is compiling a conditional subpattern, but actual runaway loops are
210        now caught at runtime (see 39 above).
211    
212    41. It seems that Perl allows any characters other than a closing parenthesis
213        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
214        has been changed to be the same.
215    
216    42. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
217        as not to get warnings when autogen.sh is called. Also changed
218        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
219    
220    43. To help people who use pcregrep to scan files containing exceedingly long
221        lines, the following changes have been made:
222    
223        (a) The default value of the buffer size parameter has been increased from
224            8K to 20K. (A buffer three times this size is actually used.)
225    
226        (b) The default can be changed by ./configure --with-pcregrep-bufsiz when
227            PCRE is built.
228    
229        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
230            to be set at run time.
231    
232        (d) Numerical values in pcregrep options can be followed by K or M, for
233            example --buffer-size=50K.
234    
235        (e) If a line being scanned overflows pcregrep's buffer, an error is now
236            given and the return code is set to 2.
237    
238    44. Add a pointer to the latest mark to the callout data block.
239    
240    
241    Version 8.12 15-Jan-2011
242    ------------------------
243    
244    1.  Fixed some typos in the markup of the man pages, and wrote a script that
245        checks for such things as part of the documentation building process.
246    
247    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
248        --match-limit and --recursion-limit options (added for 8.11). In
249        particular, this made one of the standard tests fail. (The integer value
250        went into the wrong half of a long int.)
251    
252    3.  If the --colour option was given to pcregrep with -v (invert match), it
253        did strange things, either producing crazy output, or crashing. It should,
254        of course, ignore a request for colour when reporting lines that do not
255        match.
256    
257    4.  Another pcregrep bug caused similar problems if --colour was specified with
258        -M (multiline) and the pattern match finished with a line ending.
259    
260    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
261        matched in multiline mode, the following line was shown as part of the
262        match. This seems wrong, so I have changed it.
263    
264    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
265        the check for further matches in the same line (so they could be coloured)
266        to overrun the end of the current line. If another match was found, it was
267        incorrectly shown (and then shown again when found in the next line).
268    
269    7.  If pcregrep was compiled under Windows, there was a reference to the
270        function pcregrep_exit() before it was defined. I am assuming this was
271        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
272        reported by a user. I've moved the definition above the reference.
273    
274    
275    Version 8.11 10-Dec-2010
276    ------------------------
277    
278    1.  (*THEN) was not working properly if there were untried alternatives prior
279        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
280        backtracked to try for "b" instead of moving to the next alternative branch
281        at the same level (in this case, to look for "c"). The Perl documentation
282        is clear that when (*THEN) is backtracked onto, it goes to the "next
283        alternative in the innermost enclosing group".
284    
285    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
286        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
287        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
288        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
289        (*THEN).
290    
291    3.  If \s appeared in a character class, it removed the VT character from
292        the class, even if it had been included by some previous item, for example
293        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
294        of \s, but is part of the POSIX "space" class.)
295    
296    4.  A partial match never returns an empty string (because you can always
297        match an empty string at the end of the subject); however the checking for
298        an empty string was starting at the "start of match" point. This has been
299        changed to the "earliest inspected character" point, because the returned
300        data for a partial match starts at this character. This means that, for
301        example, /(?<=abc)def/ gives a partial match for the subject "abc"
302        (previously it gave "no match").
303    
304    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
305        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
306        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
307        has an implication that the given string is incomplete (because a partial
308        match is preferred over a full match). For this reason, these items now
309        give a partial match in this situation. [Aside: previously, the one case
310        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
311        match rather than a full match, which was wrong by the old rules, but is
312        now correct.]
313    
314    6.  There was a bug in the handling of #-introduced comments, recognized when
315        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
316        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
317        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
318        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
319        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
320        places in pcre_compile().
321    
322    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
323        comments when looking ahead for named forward references to subpatterns,
324        the only newline sequence it recognized was NL. It now handles newlines
325        according to the set newline convention.
326    
327    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
328        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
329        cater for a lack of strerror(). These oversights have been fixed.
330    
331    9.  Added --match-limit and --recursion-limit to pcregrep.
332    
333    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
334    
335    11. When the -o option was used, pcregrep was setting a return code of 1, even
336        when matches were found, and --line-buffered was not being honoured.
337    
338    12. Added an optional parentheses number to the -o and --only-matching options
339        of pcregrep.
340    
341    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
342        can match an empty string. The code to do it in pcretest and pcredemo
343        needed fixing:
344    
345        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
346            only one byte after an empty string match just before CRLF (this case
347            just got forgotten; "any" and "anycrlf" were OK).
348    
349        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
350            mode when an empty string match preceded an ASCII character followed by
351            a non-ASCII character. (The code for advancing by one character rather
352            than one byte was nonsense.)
353    
354        (c) The pcredemo.c sample program did not have any code at all to handle
355            the cases when CRLF is a valid newline sequence.
356    
357    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
358        as a starting offset was within the subject string. There is now a new
359        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
360        negative or greater than the length of the string. In order to test this,
361        pcretest is extended to allow the setting of negative starting offsets.
362    
363    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
364        starting offset points to the beginning of a UTF-8 character was
365        unnecessarily clumsy. I tidied it up.
366    
367    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
368        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
369    
370    17. Nobody had reported that the --include_dir option, which was added in
371        release 7.7 should have been called --include-dir (hyphen, not underscore)
372        for compatibility with GNU grep. I have changed it to --include-dir, but
373        left --include_dir as an undocumented synonym, and the same for
374        --exclude-dir, though that is not available in GNU grep, at least as of
375        release 2.5.4.
376    
377    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
378        characters from a string of bytes) have been redefined so as not to use
379        loops, in order to improve performance in some environments. At the same
380        time, I abstracted some of the common code into auxiliary macros to save
381        repetition (this should not affect the compiled code).
382    
383    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
384        compile-time error is now given if \c is not followed by an ASCII
385        character, that is, a byte less than 128. (In EBCDIC mode, the code is
386        different, and any byte value is allowed.)
387    
388    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
389        START_OPTIMIZE option, which is now allowed at compile time - but just
390        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
391        to pcregrep and other applications that have no direct access to PCRE
392        options. The new /Y option in pcretest sets this option when calling
393        pcre_compile().
394    
395    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
396        back references. Groups containing recursive back references were forced to
397        be atomic by that change, but in the case of named groups, the amount of
398        memory required was incorrectly computed, leading to "Failed: internal
399        error: code overflow". This has been fixed.
400    
401    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
402        pcretest.c, to avoid build problems in some Borland environments.
403    
404    
405    Version 8.10 25-Jun-2010
406    ------------------------
407    
408    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
409        THEN.
410    
411    2.  (*ACCEPT) was not working when inside an atomic group.
412    
413    3.  Inside a character class, \B is treated as a literal by default, but
414        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
415        causes the error). The code is unchanged, but I tidied the documentation.
416    
417    4.  Inside a character class, PCRE always treated \R and \X as literals,
418        whereas Perl faults them if its -w option is set. I have changed PCRE so
419        that it faults them when PCRE_EXTRA is set.
420    
421    5.  Added support for \N, which always matches any character other than
422        newline. (It is the same as "." when PCRE_DOTALL is not set.)
423    
424    6.  When compiling pcregrep with newer versions of gcc which may have
425        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
426        declared with attribute warn_unused_result" were given. Just casting the
427        result to (void) does not stop the warnings; a more elaborate fudge is
428        needed. I've used a macro to implement this.
429    
430    7.  Minor change to pcretest.c to avoid a compiler warning.
431    
432    8.  Added four artifical Unicode properties to help with an option to make
433        \s etc use properties (see next item). The new properties are: Xan
434        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
435    
436    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
437        use Unicode properties. (*UCP) at the start of a pattern can be used to set
438        this option. Modified pcretest to add /W to test this facility. Added
439        REG_UCP to make it available via the POSIX interface.
440    
441    10. Added --line-buffered to pcregrep.
442    
443    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
444        studied, and the match started with a letter with a code point greater than
445        127 whose first byte was different to the first byte of the other case of
446        the letter, the other case of this starting letter was not recognized
447        (#976).
448    
449    12. If a pattern that was studied started with a repeated Unicode property
450        test, for example, \p{Nd}+, there was the theoretical possibility of
451        setting up an incorrect bitmap of starting bytes, but fortunately it could
452        not have actually happened in practice until change 8 above was made (it
453        added property types that matched character-matching opcodes).
454    
455    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
456        possible starting bytes for non-anchored patterns.
457    
458    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
459        \R, and also a number of cases that involve Unicode properties, both
460        explicit and implicit when PCRE_UCP is set.
461    
462    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
463        input, it could crash or give wrong results if characters with values
464        greater than 0xc0 were present in the subject string. (Detail: it assumed
465        UTF-8 input when processing these items.)
466    
467    16. Added a lot of (int) casts to avoid compiler warnings in systems where
468        size_t is 64-bit (#991).
469    
470    17. Added a check for running out of memory when PCRE is compiled with
471        --disable-stack-for-recursion (#990).
472    
473    18. If the last data line in a file for pcretest does not have a newline on
474        the end, a newline was missing in the output.
475    
476    19. The default pcre_chartables.c file recognizes only ASCII characters (values
477        less than 128) in its various bitmaps. However, there is a facility for
478        generating tables according to the current locale when PCRE is compiled. It
479        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
480        characters, are recognized by isspace() and therefore were getting set in
481        these tables, and indeed these tables seem to approximate to ISO 8859. This
482        caused a problem in UTF-8 mode when pcre_study() was used to create a list
483        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
484        which of course cannot start UTF-8 characters. I have changed the code so
485        that only real ASCII characters (less than 128) and the correct starting
486        bytes for UTF-8 encodings are set for characters greater than 127 when in
487        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
488        altogether.)
489    
490    20. Added the /T option to pcretest so as to be able to run tests with non-
491        standard character tables, thus making it possible to include the tests
492        used for 19 above in the standard set of tests.
493    
494    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
495        reference to a subpattern the other side of a comment that contains an
496        opening parenthesis caused either an internal compiling error, or a
497        reference to the wrong subpattern.
498    
499    
500    Version 8.02 19-Mar-2010
501    ------------------------
502    
503    1.  The Unicode data tables have been updated to Unicode 5.2.0.
504    
505    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
506        configured.
507    
508    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
509        original author of that file, following a query about its status.
510    
511    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
512        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
513    
514    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
515        quantifier applied to a forward-referencing subroutine call, could compile
516        incorrect code or give the error "internal error: previously-checked
517        referenced subpattern not found".
518    
519    6.  Both MS Visual Studio and Symbian OS have problems with initializing
520        variables to point to external functions. For these systems, therefore,
521        pcre_malloc etc. are now initialized to local functions that call the
522        relevant global functions.
523    
524    7.  There were two entries missing in the vectors called coptable and poptable
525        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
526        I've fixed the data, and added a kludgy way of testing at compile time that
527        the lengths are correct (equal to the number of opcodes).
528    
529    8.  Following on from 7, I added a similar kludge to check the length of the
530        eint vector in pcreposix.c.
531    
532    9.  Error texts for pcre_compile() are held as one long string to avoid too
533        much relocation at load time. To find a text, the string is searched,
534        counting zeros. There was no check for running off the end of the string,
535        which could happen if a new error number was added without updating the
536        string.
537    
538    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
539    
540    11. \K was not working if it appeared in an atomic group or in a group that
541        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
542        \K is "not well defined" if used in an assertion. PCRE now accepts it if
543        the assertion is positive, but not if it is negative.
544    
545    12. Change 11 fortuitously reduced the size of the stack frame used in the
546        "match()" function of pcre_exec.c by one pointer. Forthcoming
547        implementation of support for (*MARK) will need an extra pointer on the
548        stack; I have reserved it now, so that the stack frame size does not
549        decrease.
550    
551    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
552        item in branch that calls a recursion is a subroutine call - as in the
553        second branch in the above example - was incorrectly given the compile-
554        time error "recursive call could loop indefinitely" because pcre_compile()
555        was not correctly checking the subroutine for matching a non-empty string.
556    
557    14. The checks for overrunning compiling workspace could trigger after an
558        overrun had occurred. This is a "should never occur" error, but it can be
559        triggered by pathological patterns such as hundreds of nested parentheses.
560        The checks now trigger 100 bytes before the end of the workspace.
561    
562    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
563    
564    
565    Version 8.01 19-Jan-2010
566    ------------------------
567    
568    1.  If a pattern contained a conditional subpattern with only one branch (in
569        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
570        computed the wrong minimum data length (which is of course zero for such
571        subpatterns). This could cause incorrect "no match" results.
572    
573    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
574        the pattern is reset in the first branch, pcre_compile() failed with
575        "internal error: code overflow at offset...". This happened only when
576        the reset was to the original external option setting. (An optimization
577        abstracts leading options settings into an external setting, which was the
578        cause of this.)
579    
580    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
581        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
582        assertion pattern did not match (meaning that the assertion was true), it
583        was incorrectly treated as false if the SKIP had been reached during the
584        matching. This also applied to assertions used as conditions.
585    
586    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
587        assertion subpattern, including such a pattern used as a condition,
588        unpredictable results occurred, instead of the error return
589        PCRE_ERROR_DFA_UITEM.
590    
591    5.  The C++ GlobalReplace function was not working like Perl for the special
592        situation when an empty string is matched. It now does the fancy magic
593        stuff that is necessary.
594    
595    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
596        removed. (These were left over from very, very early versions of PCRE.)
597    
598    7.  Some cosmetic changes to the code to make life easier when compiling it
599        as part of something else:
600    
601        (a) Change DEBUG to PCRE_DEBUG.
602    
603        (b) In pcre_compile(), rename the member of the "branch_chain" structure
604            called "current" as "current_branch", to prevent a collision with the
605            Linux macro when compiled as a kernel module.
606    
607        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
608            prevent a collision with the Linux macro when compiled as a kernel
609            module.
610    
611    8.  In pcre_compile() there are some checks for integer overflows that used to
612        cast potentially large values to (double). This has been changed to that
613        when building, a check for int64_t is made, and if it is found, it is used
614        instead, thus avoiding the use of floating point arithmetic. (There is no
615        other use of FP in PCRE.) If int64_t is not found, the fallback is to
616        double.
617    
618    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
619        2005 (difference between two addresses compared to an unsigned value).
620    
621    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
622        custom one, because of the following reported problem in Windows:
623    
624          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
625              under Win32.
626          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
627              therefore missing the function definition.
628          - The compiler thus generates a "C" signature for the test function.
629          - The linker fails to find the "C" function.
630          - PCRE fails to configure if asked to do so against libbz2.
631    
632    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
633        messages were output:
634    
635          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
636          rerunning libtoolize, to keep the correct libtool macros in-tree.
637          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
638    
639        I have done both of these things.
640    
641    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
642        most of the time, it *can* run out if it is given a pattern that contains a
643        runaway infinite recursion. I updated the discussion in the pcrestack man
644        page.
645    
646    13. Now that we have gone to the x.xx style of version numbers, the minor
647        version may start with zero. Using 08 or 09 is a bad idea because users
648        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
649        interpreted as invalid octal numbers. I've updated the previous comment in
650        configure.ac, and also added a check that gives an error if 08 or 09 are
651        used.
652    
653    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
654        causing partial matching to fail when the end of the subject matched \W
655        in a UTF-8 pattern where \W was quantified with a minimum of 3.
656    
657    15. There were some discrepancies between the declarations in pcre_internal.h
658        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
659        their definitions. The declarations used "const uschar *" and the
660        definitions used USPTR. Even though USPTR is normally defined as "const
661        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
662        reported that: "This difference in casting confuses some C++ compilers, for
663        example, SunCC recognizes above declarations as different functions and
664        generates broken code for hbpcre." I have changed the declarations to use
665        USPTR.
666    
667    16. GNU libtool is named differently on some systems. The autogen.sh script now
668        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
669        (FreeBSD).
670    
671    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
672        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
673        comment: "Figure out how to create a longlong from a string: strtoll and
674        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
675        instance, but it only takes 2 args instead of 3!"
676    
677    18. A subtle bug concerned with back references has been fixed by a change of
678        specification, with a corresponding code fix. A pattern such as
679        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
680        refers, was giving matches when it shouldn't. For example, xa=xaaa would
681        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
682        same bug. Such groups have to be quantified to be useful, or contained
683        inside another quantified group. (If there's no repetition, the reference
684        can never match.) The problem arises because, having left the group and
685        moved on to the rest of the pattern, a later failure that backtracks into
686        the group uses the captured value from the final iteration of the group
687        rather than the correct earlier one. I have fixed this in PCRE by forcing
688        any group that contains a reference to itself to be an atomic group; that
689        is, there cannot be any backtracking into it once it has completed. This is
690        similar to recursive and subroutine calls.
691    
692    
693    Version 8.00 19-Oct-09
694    ----------------------
695    
696    1.  The table for translating pcre_compile() error codes into POSIX error codes
697        was out-of-date, and there was no check on the pcre_compile() error code
698        being within the table. This could lead to an OK return being given in
699        error.
700    
701    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
702        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
703        in a Windows environment.
704    
705    3.  The pcregrep --count option prints the count for each file even when it is
706        zero, as does GNU grep. However, pcregrep was also printing all files when
707        --files-with-matches was added. Now, when both options are given, it prints
708        counts only for those files that have at least one match. (GNU grep just
709        prints the file name in this circumstance, but including the count seems
710        more useful - otherwise, why use --count?) Also ensured that the
711        combination -clh just lists non-zero counts, with no names.
712    
713    4.  The long form of the pcregrep -F option was incorrectly implemented as
714        --fixed_strings instead of --fixed-strings. This is an incompatible change,
715        but it seems right to fix it, and I didn't think it was worth preserving
716        the old behaviour.
717    
718    5.  The command line items --regex=pattern and --regexp=pattern were not
719        recognized by pcregrep, which required --regex pattern or --regexp pattern
720        (with a space rather than an '='). The man page documented the '=' forms,
721        which are compatible with GNU grep; these now work.
722    
723    6.  No libpcreposix.pc file was created for pkg-config; there was just
724        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
725    
726    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
727        when UCP support is not needed, by modifying the Python script that
728        generates it from Unicode data files. This should not matter if the module
729        is correctly used as a library, but I received one complaint about 50K of
730        unwanted data. My guess is that the person linked everything into his
731        program rather than using a library. Anyway, it does no harm.
732    
733    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
734        was a minimum greater than 1 for a wide character in a possessive
735        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
736        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
737        character. Chaos in the form of incorrect output or a compiling loop could
738        result.
739    
740    9.  The restrictions on what a pattern can contain when partial matching is
741        requested for pcre_exec() have been removed. All patterns can now be
742        partially matched by this function. In addition, if there are at least two
743        slots in the offset vector, the offset of the earliest inspected character
744        for the match and the offset of the end of the subject are set in them when
745        PCRE_ERROR_PARTIAL is returned.
746    
747    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
748        synonymous with PCRE_PARTIAL, for backwards compatibility, and
749        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
750        and may be more useful for multi-segment matching.
751    
752    11. Partial matching with pcre_exec() is now more intuitive. A partial match
753        used to be given if ever the end of the subject was reached; now it is
754        given only if matching could not proceed because another character was
755        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
756        string "Z", which now yields "no match" instead of "partial match". In the
757        case of pcre_dfa_exec(), "no match" is given if every matching path for the
758        final character ended with (*FAIL).
759    
760    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
761        if the pattern had a "must contain" character that was already found in the
762        earlier partial match, unless partial matching was again requested. For
763        example, with the pattern /dog.(body)?/, the "must contain" character is
764        "g". If the first part-match was for the string "dog", restarting with
765        "sbody" failed. This bug has been fixed.
766    
767    13. The string returned by pcre_dfa_exec() after a partial match has been
768        changed so that it starts at the first inspected character rather than the
769        first character of the match. This makes a difference only if the pattern
770        starts with a lookbehind assertion or \b or \B (\K is not supported by
771        pcre_dfa_exec()). It's an incompatible change, but it makes the two
772        matching functions compatible, and I think it's the right thing to do.
773    
774    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
775        so that the demonstration program is easily available in environments where
776        PCRE has not been installed from source.
777    
778    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
779        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
780        library.
781    
782    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
783        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
784        is not the first non-POSIX option to be added. Clearly some people find
785        these options useful.
786    
787    17. If a caller to the POSIX matching function regexec() passes a non-zero
788        value for nmatch with a NULL value for pmatch, the value of
789        nmatch is forced to zero.
790    
791    18. RunGrepTest did not have a test for the availability of the -u option of
792        the diff command, as RunTest does. It now checks in the same way as
793        RunTest, and also checks for the -b option.
794    
795    19. If an odd number of negated classes containing just a single character
796        interposed, within parentheses, between a forward reference to a named
797        subpattern and the definition of the subpattern, compilation crashed with
798        an internal error, complaining that it could not find the referenced
799        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
800        [The bug was that it was starting one character too far in when skipping
801        over the character class, thus treating the ] as data rather than
802        terminating the class. This meant it could skip too much.]
803    
804    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
805        /g option in pcretest when the pattern contains \K, which makes it possible
806        to have an empty string match not at the start, even when the pattern is
807        anchored. Updated pcretest and pcredemo to use this option.
808    
809    21. If the maximum number of capturing subpatterns in a recursion was greater
810        than the maximum at the outer level, the higher number was returned, but
811        with unset values at the outer level. The correct (outer level) value is
812        now given.
813    
814    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
815        PCRE did not set those parentheses (unlike Perl). I have now found a way to
816        make it do so. The string so far is captured, making this feature
817        compatible with Perl.
818    
819    23. The tests have been re-organized, adding tests 11 and 12, to make it
820        possible to check the Perl 5.10 features against Perl 5.10.
821    
822    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
823        pattern matches a fixed length string. PCRE did not allow this; now it
824        does. Neither allows recursion.
825    
826    25. I finally figured out how to implement a request to provide the minimum
827        length of subject string that was needed in order to match a given pattern.
828        (It was back references and recursion that I had previously got hung up
829        on.) This code has now been added to pcre_study(); it finds a lower bound
830        to the length of subject needed. It is not necessarily the greatest lower
831        bound, but using it to avoid searching strings that are too short does give
832        some useful speed-ups. The value is available to calling programs via
833        pcre_fullinfo().
834    
835    26. While implementing 25, I discovered to my embarrassment that pcretest had
836        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
837        study optimizations had never been tested with that matching function.
838        Oops. What is worse, even when it was passed study data, there was a bug in
839        pcre_dfa_exec() that meant it never actually used it. Double oops. There
840        were also very few tests of studied patterns with pcre_dfa_exec().
841    
842    27. If (?| is used to create subpatterns with duplicate numbers, they are now
843        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
844        on the other side of the coin, they are no longer allowed to have different
845        names, because these cannot be distinguished in PCRE, and this has caused
846        confusion. (This is a difference from Perl.)
847    
848    28. When duplicate subpattern names are present (necessarily with different
849        numbers, as required by 27 above), and a test is made by name in a
850        conditional pattern, either for a subpattern having been matched, or for
851        recursion in such a pattern, all the associated numbered subpatterns are
852        tested, and the overall condition is true if the condition is true for any
853        one of them. This is the way Perl works, and is also more like the way
854        testing by number works.
855    
856    
857    Version 7.9 11-Apr-09
858    ---------------------
859    
860    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
861        (pcretest), all targets were linked against these libraries. This included
862        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
863        libraries. This caused unwanted dependencies to be created. This problem
864        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
865        pcretest is linked with readline.
866    
867    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
868        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
869        moved outside it again, because FALSE and TRUE are already defined in AIX,
870        but BOOL is not.
871    
872    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
873        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
874    
875    4.  The pcregrep documentation said spaces were inserted as well as colons (or
876        hyphens) following file names and line numbers when outputting matching
877        lines. This is not true; no spaces are inserted. I have also clarified the
878        wording for the --colour (or --color) option.
879    
880    5.  In pcregrep, when --colour was used with -o, the list of matching strings
881        was not coloured; this is different to GNU grep, so I have changed it to be
882        the same.
883    
884    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
885        each matching line was coloured. Now it goes on to look for further matches
886        of any of the test patterns, which is the same behaviour as GNU grep.
887    
888    7.  A pattern that could match an empty string could cause pcregrep to loop; it
889        doesn't make sense to accept an empty string match in pcregrep, so I have
890        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
891        seems to be how GNU grep behaves.
892    
893    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
894        start or after a newline", because the conditional assertion was not being
895        correctly handled. The rule now is that both the assertion and what follows
896        in the first alternative must satisfy the test.
897    
898    9.  If auto-callout was enabled in a pattern with a conditional group whose
899        condition was an assertion, PCRE could crash during matching, both with
900        pcre_exec() and pcre_dfa_exec().
901    
902    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
903        used for matching.
904    
905    11. Unicode property support in character classes was not working for
906        characters (bytes) greater than 127 when not in UTF-8 mode.
907    
908    12. Added the -M command line option to pcretest.
909    
910    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
911    
912    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
913    
914    16. Added comments and documentation about mis-use of no_arg in the C++
915        wrapper.
916    
917    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
918        from Martin Jerabek that uses macro names for all relevant character and
919        string constants.
920    
921    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
922        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
923        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
924        these, but not everybody uses configure.
925    
926    19. A conditional group that had only one branch was not being correctly
927        recognized as an item that could match an empty string. This meant that an
928        enclosing group might also not be so recognized, causing infinite looping
929        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
930        with the subject "ab", where knowledge that the repeated group can match
931        nothing is needed in order to break the loop.
932    
933    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
934        exec(), but without supplying a callout function, matching went wrong.
935    
936    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
937        leak if the size of the offset vector was greater than 30. When the vector
938        is smaller, the saved offsets during recursion go onto a local stack
939        vector, but for larger vectors malloc() is used. It was failing to free
940        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
941        error, in fact).
942    
943    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
944        heapframe that is used only when UTF-8 support is enabled. This caused no
945        problem, but was untidy.
946    
947    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
948        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
949        included within another project.
950    
951    24. Steven Van Ingelgem's patches to add more options to the CMake support,
952        slightly modified by me:
953    
954          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
955              not building pcregrep.
956    
957          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
958              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
959    
960    25. Forward references, both numeric and by name, in patterns that made use of
961        duplicate group numbers, could behave incorrectly or give incorrect errors,
962        because when scanning forward to find the reference group, PCRE was not
963        taking into account the duplicate group numbers. A pattern such as
964        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
965    
966    26. Changed a few more instances of "const unsigned char *" to USPTR, making
967        the feature of a custom pointer more persuasive (as requested by a user).
968    
969    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
970        pcretest.c, inside #ifndefs, because it seems they are sometimes already
971        pre-defined.
972    
973    28. Added support for (*UTF8) at the start of a pattern.
974    
975    29. Arrange for flags added by the "release type" setting in CMake to be shown
976        in the configuration summary.
977    
978    
979    Version 7.8 05-Sep-08
980    ---------------------
981    
982    1.  Replaced UCP searching code with optimized version as implemented for Ad
983        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
984        stage table and inline lookup instead of a function, giving speed ups of 2
985        to 5 times on some simple patterns that I tested. Permission was given to
986        distribute the MultiStage2.py script that generates the tables (it's not in
987        the tarball, but is in the Subversion repository).
988    
989    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
990        scripts.
991    
992    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
993        a group with a zero qualifier. The result of the study could be incorrect,
994        or the function might crash, depending on the pattern.
995    
996    4.  Caseless matching was not working for non-ASCII characters in back
997        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
998        It now works when Unicode Property Support is available.
999    
1000    5.  In pcretest, an escape such as \x{de} in the data was always generating
1001        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
1002        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
1003        truncation.
1004    
1005    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
1006    
1007    7.  Added two (int) casts to pcregrep when printing the difference of two
1008        pointers, in case they are 64-bit values.
1009    
1010    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
1011        test 2 if it fails.
1012    
1013    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
1014        and a #define of that name to empty if it is not externally set. This is to
1015        allow users of MSVC to set it if necessary.
1016    
1017    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
1018        the convenience functions in the pcre_get.c source file.
1019    
1020    11. An option change at the start of a pattern that had top-level alternatives
1021        could cause overwriting and/or a crash. This command provoked a crash in
1022        some environments:
1023    
1024          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
1025    
1026        This potential security problem was recorded as CVE-2008-2371.
1027    
1028    12. For a pattern where the match had to start at the beginning or immediately
1029        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
1030        pcre_dfa_exec() could read past the end of the passed subject if there was
1031        no match. To help with detecting such bugs (e.g. with valgrind), I modified
1032        pcretest so that it places the subject at the end of its malloc-ed buffer.
1033    
1034    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
1035        exec() might read past the end of the data buffer in UTF-8 mode.
1036    
1037    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
1038        the data contained the byte 0x85 as part of a UTF-8 character within its
1039        first line. This applied both to normal and DFA matching.
1040    
1041    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
1042        /^[^d]*?$/8 failed to match "abc".
1043    
1044    16. Added a missing copyright notice to pcrecpp_internal.h.
1045    
1046    17. Make it more clear in the documentation that values returned from
1047        pcre_exec() in ovector are byte offsets, not character counts.
1048    
1049    18. Tidied a few places to stop certain compilers from issuing warnings.
1050    
1051    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
1052        supplied by Stefan Weber. I made a further small update for 7.8 because
1053        there is a change of source arrangements: the pcre_searchfuncs.c module is
1054        replaced by pcre_ucd.c.
1055    
1056    
1057    Version 7.7 07-May-08
1058    ---------------------
1059    
1060    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
1061        a string to a long long, pretend we don't even have a long long." This is
1062        done by checking for the strtoq, strtoll, and _strtoi64 functions.
1063    
1064    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
1065        pre-7.6 versions, which defined a global no_arg variable instead of putting
1066        it in the RE class. (See also #8 below.)
1067    
1068    3.  Remove a line of dead code, identified by coverity and reported by Nuno
1069        Lopes.
1070    
1071    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
1072    
1073        (1) The include/exclude patterns were being applied to the whole pathnames
1074            of files, instead of just to the final components.
1075    
1076        (2) If there was more than one level of directory, the subdirectories were
1077            skipped unless they satisfied the include/exclude conditions. This is
1078            inconsistent with GNU grep (and could even be seen as contrary to the
1079            pcregrep specification - which I improved to make it absolutely clear).
1080            The action now is always to scan all levels of directory, and just
1081            apply the include/exclude patterns to regular files.
1082    
1083    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
1084        --exclude_dir in the tests to avoid scanning .svn directories.
1085    
1086    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
1087        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
1088        doesn't support NULs in patterns.
1089    
1090    7.  Added some missing "const"s to declarations of static tables in
1091        pcre_compile.c and pcre_dfa_exec.c.
1092    
1093    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
1094        caused by fix #2  above. (Subsequently also a second patch to fix the
1095        first patch. And a third patch - this was a messy problem.)
1096    
1097    9.  Applied Craig's patch to remove the use of push_back().
1098    
1099    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
1100        matching function regexec().
1101    
1102    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
1103        which, however, unlike Perl's \g{...}, are subroutine calls, not back
1104        references. PCRE supports relative numbers with this syntax (I don't think
1105        Oniguruma does).
1106    
1107    12. Previously, a group with a zero repeat such as (...){0} was completely
1108        omitted from the compiled regex. However, this means that if the group
1109        was called as a subroutine from elsewhere in the pattern, things went wrong
1110        (an internal error was given). Such groups are now left in the compiled
1111        pattern, with a new opcode that causes them to be skipped at execution
1112        time.
1113    
1114    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
1115        to the way PCRE behaves:
1116    
1117        (a) A lone ] character is dis-allowed (Perl treats it as data).
1118    
1119        (b) A back reference to an unmatched subpattern matches an empty string
1120            (Perl fails the current match path).
1121    
1122        (c) A data ] in a character class must be notated as \] because if the
1123            first data character in a class is ], it defines an empty class. (In
1124            Perl it is not possible to have an empty class.) The empty class []
1125            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
1126            The negative empty class [^] matches any one character, independently
1127            of the DOTALL setting.
1128    
1129    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
1130        non-existent subpattern following a character class starting with ']' and
1131        containing () gave an internal compiling error instead of "reference to
1132        non-existent subpattern". Fortunately, when the pattern did exist, the
1133        compiled code was correct. (When scanning forwards to check for the
1134        existencd of the subpattern, it was treating the data ']' as terminating
1135        the class, so got the count wrong. When actually compiling, the reference
1136        was subsequently set up correctly.)
1137    
1138    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
1139        it was being rejected as not supported by pcre_dfa_exec(), even though
1140        other assertions are supported. I have made pcre_dfa_exec() support
1141        (*FAIL).
1142    
1143    16. The implementation of 13c above involved the invention of a new opcode,
1144        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
1145        cannot be changed at match time, I realized I could make a small
1146        improvement to matching performance by compiling OP_ALLANY instead of
1147        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
1148        on the OP_ANY path.
1149    
1150    17. Compiling pcretest on Windows with readline support failed without the
1151        following two fixes: (1) Make the unistd.h include conditional on
1152        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
1153    
1154    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
1155        ncurses library to be included for pcretest when ReadLine support is
1156        requested, but also to allow for it to be overridden. This patch came from
1157        Daniel Bergström.
1158    
1159    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
1160        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
1161        any errors with the current Unicode tables. Thanks to Peter Kankowski for
1162        spotting this.
1163    
1164    
1165    Version 7.6 28-Jan-08
1166    ---------------------
1167    
1168    1.  A character class containing a very large number of characters with
1169        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
1170        overflow.
1171    
1172    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
1173        HAVE_LONG_LONG is not defined.
1174    
1175    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
1176        bring them up to date and include new features. This patch includes:
1177    
1178        - Fixed PH's badly added libz and libbz2 support.
1179        - Fixed a problem with static linking.
1180        - Added pcredemo. [But later removed - see 7 below.]
1181        - Fixed dftables problem and added an option.
1182        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
1183            HAVE_LONG_LONG.
1184        - Added readline support for pcretest.
1185        - Added an listing of the option settings after cmake has run.
1186    
1187    4.  A user submitted a patch to Makefile that makes it easy to create
1188        "pcre.dll" under mingw when using Configure/Make. I added stuff to
1189        Makefile.am that cause it to include this special target, without
1190        affecting anything else. Note that the same mingw target plus all
1191        the other distribution libraries and programs are now supported
1192        when configuring with CMake (see 6 below) instead of with
1193        Configure/Make.
1194    
1195    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
1196        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
1197        exported in the Windows port". It has not yet been confirmed that the patch
1198        solves the problem, but it does no harm.
1199    
1200    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
1201        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
1202        with CMake, and also correct the comment about stack recursion.
1203    
1204    7.  Remove the automatic building of pcredemo from the ./configure system and
1205        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
1206        of a program that users should build themselves after PCRE is installed, so
1207        building it automatically is not really right. What is more, it gave
1208        trouble in some build environments.
1209    
1210    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
1211    
1212    
1213    Version 7.5 10-Jan-08
1214    ---------------------
1215    
1216    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
1217        values in parens when parsing an RE using the C++ wrapper."
1218    
1219    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
1220        Characters greater than 255 were excluded from the class instead of being
1221        included.
1222    
1223    3.  The same bug as (2) above applied to negated POSIX classes such as
1224        [:^space:].
1225    
1226    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
1227        defined or documented. It seems to have been a typo for PCRE_STATIC, so
1228        I have changed it.
1229    
1230    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
1231        first named subpattern) and a construct such as (?&a) would reference the
1232        first named subpattern whose name started with "a" (in other words, the
1233        length check was missing). Both these problems are fixed. "Subpattern name
1234        expected" is now given for (?&) (a zero-length name), and this patch also
1235        makes it give the same error for \k'' (previously it complained that that
1236        was a reference to a non-existent subpattern).
1237    
1238    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
1239        this is right because (?- can be followed by option settings as well as by
1240        digits. I have, however, made the messages clearer.
1241    
1242    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
1243        than the number used in the conditional) now cause a compile-time error.
1244        This is actually not compatible with Perl, which accepts such patterns, but
1245        treats the conditional as always being FALSE (as PCRE used to), but it
1246        seems to me that giving a diagnostic is better.
1247    
1248    8.  Change "alphameric" to the more common word "alphanumeric" in comments
1249        and messages.
1250    
1251    9.  Fix two occurrences of "backslash" in comments that should have been
1252        "backspace".
1253    
1254    10. Remove two redundant lines of code that can never be obeyed (their function
1255        was moved elsewhere).
1256    
1257    11. The program that makes PCRE's Unicode character property table had a bug
1258        which caused it to generate incorrect table entries for sequences of
1259        characters that have the same character type, but are in different scripts.
1260        It amalgamated them into a single range, with the script of the first of
1261        them. In other words, some characters were in the wrong script. There were
1262        thirteen such cases, affecting characters in the following ranges:
1263    
1264          U+002b0 - U+002c1
1265          U+0060c - U+0060d
1266          U+0061e - U+00612
1267          U+0064b - U+0065e
1268          U+0074d - U+0076d
1269          U+01800 - U+01805
1270          U+01d00 - U+01d77
1271          U+01d9b - U+01dbf
1272          U+0200b - U+0200f
1273          U+030fc - U+030fe
1274          U+03260 - U+0327f
1275          U+0fb46 - U+0fbb1
1276          U+10450 - U+1049d
1277    
1278    12. The -o option (show only the matching part of a line) for pcregrep was not
1279        compatible with GNU grep in that, if there was more than one match in a
1280        line, it showed only the first of them. It now behaves in the same way as
1281        GNU grep.
1282    
1283    13. If the -o and -v options were combined for pcregrep, it printed a blank
1284        line for every non-matching line. GNU grep prints nothing, and pcregrep now
1285        does the same. The return code can be used to tell if there were any
1286        non-matching lines.
1287    
1288    14. Added --file-offsets and --line-offsets to pcregrep.
1289    
1290    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
1291        infinitely looping recursion. The bug was that positive lookaheads were not
1292        being skipped when checking for a possible empty match (negative lookaheads
1293        and both kinds of lookbehind were skipped).
1294    
1295    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
1296        inclusion of <windows.h> to before rather than after the definition of
1297        INVALID_FILE_ATTRIBUTES (patch from David Byron).
1298    
1299    17. Specifying a possessive quantifier with a specific limit for a Unicode
1300        character property caused pcre_compile() to compile bad code, which led at
1301        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
1302        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
1303        caused the error; without that there was no problem.
1304    
1305    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
1306    
1307    19. Added --enable-pcretest-libreadline.
1308    
1309    20. In pcrecpp.cc, the variable 'count' was incremented twice in
1310        RE::GlobalReplace(). As a result, the number of replacements returned was
1311        double what it should be. I removed one of the increments, but Craig sent a
1312        later patch that removed the other one (the right fix) and added unit tests
1313        that check the return values (which was not done before).
1314    
1315    21. Several CMake things:
1316    
1317        (1) Arranged that, when cmake is used on Unix, the libraries end up with
1318            the names libpcre and libpcreposix, not just pcre and pcreposix.
1319    
1320        (2) The above change means that pcretest and pcregrep are now correctly
1321            linked with the newly-built libraries, not previously installed ones.
1322    
1323        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
1324    
1325    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
1326        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
1327        UTF-8 newline character). The key issue is that the pattern starts .*;
1328        this means that the match must be either at the beginning, or after a
1329        newline. The bug was in the code for advancing after a failed match and
1330        checking that the new position followed a newline. It was not taking
1331        account of UTF-8 characters correctly.
1332    
1333    23. PCRE was behaving differently from Perl in the way it recognized POSIX
1334        character classes. PCRE was not treating the sequence [:...:] as a
1335        character class unless the ... were all letters. Perl, however, seems to
1336        allow any characters between [: and :], though of course it rejects as
1337        unknown any "names" that contain non-letters, because all the known class
1338        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
1339        for example, whereas PCRE did not - it did not recognize a POSIX character
1340        class. This seemed a bit dangerous, so the code has been changed to be
1341        closer to Perl. The behaviour is not identical to Perl, because PCRE will
1342        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
1343        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1344        Perl does, and where it didn't before.
1345    
1346    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1347        Windows environments %n is disabled by default.
1348    
1349    
1350  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07
1351  ---------------------  ---------------------
1352    
# Line 72  Version 7.4 21-Sep-07 Line 1418  Version 7.4 21-Sep-07
1418      and instead check for _strtoi64 explicitly, and avoid the use of snprintf()      and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
1419      entirely. This removes changes made in 7 above.      entirely. This removes changes made in 7 above.
1420    
1421    17. The CMake files have been updated, and there is now more information about
1422        building with CMake in the NON-UNIX-USE document.
1423    
1424    
1425  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
1426  ---------------------  ---------------------

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