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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 7.3 05-Jul-07
5    ---------------------
6    
7     1. In the rejigging of the build system that eventually resulted in 7.1, the
8        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
9        brackets there is not right, since it causes compilers to look for an
10        installed pcre.h, not the version that is in the source that is being
11        compiled (which of course may be different). I have changed it back to:
12    
13          #include "pcre.h"
14    
15        I have a vague recollection that the change was concerned with compiling in
16        different directories, but in the new build system, that is taken care of
17        by the VPATH setting the Makefile.
18    
19     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
20        when the subject happened to end in the byte 0x85 (e.g. if the last
21        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
22        characters but of course it shouldn't be taken as a newline when it is part
23        of another character. The bug was that, for an unlimited repeat of . in
24        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
25        characters when looking for a newline.
26    
27     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
28    
29    
30    
31    Version 7.2 19-Jun-07
32    ---------------------
33    
34     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
35        which is apparently normally available under Windows.
36    
37     2. Re-jig the pcregrep tests with different newline settings in an attempt
38        to make them independent of the local environment's newline setting.
39    
40     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
41    
42     4. Some of the "internals" tests were previously cut out when the link size
43        was not 2, because the output contained actual offsets. The recent new
44        "Z" feature of pcretest means that these can be cut out, making the tests
45        usable with all link sizes.
46    
47     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
48        stack recursion. This gives a massive performance boost under BSD, but just
49        a small improvement under Linux. However, it saves one field in the frame
50        in all cases.
51    
52     6. Added more features from the forthcoming Perl 5.10:
53    
54        (a) (?-n) (where n is a string of digits) is a relative subroutine or
55            recursion call. It refers to the nth most recently opened parentheses.
56    
57        (b) (?+n) is also a relative subroutine call; it refers to the nth next
58            to be opened parentheses.
59    
60        (c) Conditions that refer to capturing parentheses can be specified
61            relatively, for example, (?(-2)... or (?(+3)...
62    
63        (d) \K resets the start of the current match so that everything before
64            is not part of it.
65    
66        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
67    
68        (f) \g{name} is another synonym - part of Perl 5.10's unification of
69            reference syntax.
70    
71        (g) (?| introduces a group in which the numbering of parentheses in each
72            alternative starts with the same number.
73    
74        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
75    
76     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
77        PCRE_INFO_JCHANGED.
78    
79     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
80        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
81        for detecting groups that can match an empty string.
82    
83     9. A pattern with a very large number of alternatives (more than several
84        hundred) was running out of internal workspace during the pre-compile
85        phase, where pcre_compile() figures out how much memory will be needed. A
86        bit of new cunning has reduced the workspace needed for groups with
87        alternatives. The 1000-alternative test pattern now uses 12 bytes of
88        workspace instead of running out of the 4096 that are available.
89    
90    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
91    
92    11. Applied patch from Google to remove an optimization that didn't quite work.
93        The report of the bug said:
94    
95          pcrecpp::RE("a*").FullMatch("aaa") matches, while
96          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
97          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
98    
99    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
100        it matched the wrong number of bytes.
101    
102    
103    Version 7.1 24-Apr-07
104    ---------------------
105    
106     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
107        that is more "standard", making use of automake and other Autotools. There
108        is some re-arrangement of the files and adjustment of comments consequent
109        on this.
110    
111     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
112        for recursive directory scanning broke on some systems because the files
113        are not scanned in any specific order and on different systems the order
114        was different. A call to "sort" has been inserted into RunGrepTest for the
115        approprate test as a short-term fix. In the longer term there may be an
116        alternative.
117    
118     3. I had an email from Eric Raymond about problems translating some of PCRE's
119        man pages to HTML (despite the fact that I distribute HTML pages, some
120        people do their own conversions for various reasons). The problems
121        concerned the use of low-level troff macros .br and .in. I have therefore
122        removed all such uses from the man pages (some were redundant, some could
123        be replaced by .nf/.fi pairs). The 132html script that I use to generate
124        HTML has been updated to handle .nf/.fi and to complain if it encounters
125        .br or .in.
126    
127     4. Updated comments in configure.ac that get placed in config.h.in and also
128        arranged for config.h to be included in the distribution, with the name
129        config.h.generic, for the benefit of those who have to compile without
130        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
131    
132     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
133        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
134        makevp.bat for the current PCRE, using the additional files
135        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
136    
137     6. A Windows user reported a minor discrepancy with test 2, which turned out
138        to be caused by a trailing space on an input line that had got lost in his
139        copy. The trailing space was an accident, so I've just removed it.
140    
141     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
142        that is needed.
143    
144     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
145        as "const" (a) because they are and (b) because it helps the PHP
146        maintainers who have recently made a script to detect big data structures
147        in the php code that should be moved to the .rodata section. I remembered
148        to update Builducptable as well, so it won't revert if ucptable.h is ever
149        re-created.
150    
151     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
152        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
153        order to be able to cut out the UTF-8 tables in the latter when UTF-8
154        support is not required. This saves 1.5-2K of code, which is important in
155        some applications.
156    
157        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
158        so as not to refer to the tables, even though these functions will never be
159        called when UTF-8 support is disabled. Otherwise there are problems with a
160        shared library.
161    
162    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
163    
164        (a) It was defining its arguments as char * instead of void *.
165    
166        (b) It was assuming that all moves were upwards in memory; this was true
167            a long time ago when I wrote it, but is no longer the case.
168    
169        The emulated memove() is provided for those environments that have neither
170        memmove() nor bcopy(). I didn't think anyone used it these days, but that
171        is clearly not the case, as these two bugs were recently reported.
172    
173    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
174        and Detrail to create the HTML documentation, the .txt form of the man
175        pages, and it removes trailing spaces from listed files. It also creates
176        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
177        case, it wraps all the #defines with #ifndefs. This script should be run
178        before "make dist".
179    
180    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
181        with Unicode property support.
182    
183        (a) For a maximizing quantifier, if the two different cases of the
184            character were of different lengths in their UTF-8 codings (there are
185            some cases like this - I found 11), and the matching function had to
186            back up over a mixture of the two cases, it incorrectly assumed they
187            were both the same length.
188    
189        (b) When PCRE was configured to use the heap rather than the stack for
190            recursion during matching, it was not correctly preserving the data for
191            the other case of a UTF-8 character when checking ahead for a match
192            while processing a minimizing repeat. If the check also involved
193            matching a wide character, but failed, corruption could cause an
194            erroneous result when trying to check for a repeat of the original
195            character.
196    
197    13. Some tidying changes to the testing mechanism:
198    
199        (a) The RunTest script now detects the internal link size and whether there
200            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
201            values substituted by "configure". (The RunGrepTest script already did
202            this for UTF-8.) The configure.ac script no longer substitutes the
203            relevant variables.
204    
205        (b) The debugging options /B and /D in pcretest show the compiled bytecode
206            with length and offset values. This means that the output is different
207            for different internal link sizes. Test 2 is skipped for link sizes
208            other than 2 because of this, bypassing the problem. Unfortunately,
209            there was also a test in test 3 (the locale tests) that used /B and
210            failed for link sizes other than 2. Rather than cut the whole test out,
211            I have added a new /Z option to pcretest that replaces the length and
212            offset values with spaces. This is now used to make test 3 independent
213            of link size. (Test 2 will be tidied up later.)
214    
215    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
216        segmentation fault instead of returning the appropriate error message.
217    
218    15. In multiline mode when the newline sequence was set to "any", the pattern
219        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
220        This doesn't seem right; it now treats the CRLF combination as the line
221        ending, and so does not match in that case. It's only a pattern such as ^$
222        that would hit this one: something like ^ABC$ would have failed after \r
223        and then tried again after \r\n.
224    
225    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
226        in an attempt to make files that differ only in their line terminators
227        compare equal. This works on Linux.
228    
229    17. Under certain error circumstances pcregrep might try to free random memory
230        as it exited. This is now fixed, thanks to valgrind.
231    
232    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
233        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
234        was because its rules for how to advance for /g after matching an empty
235        string at the end of a line did not allow for this case. They now check for
236        it specially.
237    
238    20. pcretest is supposed to handle patterns and data of any length, by
239        extending its buffers when necessary. It was getting this wrong when the
240        buffer for a data line had to be extended.
241    
242    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
243        CRLF as a newline sequence.
244    
245    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
246        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
247        I have nevertheless tidied it up.
248    
249    23. Added some casts to kill warnings from HP-UX ia64 compiler.
250    
251    24. Added a man page for pcre-config.
252    
253    
254    Version 7.0 19-Dec-06
255    ---------------------
256    
257     1. Fixed a signed/unsigned compiler warning in pcre_compile.c, shown up by
258        moving to gcc 4.1.1.
259    
260     2. The -S option for pcretest uses setrlimit(); I had omitted to #include
261        sys/time.h, which is documented as needed for this function. It doesn't
262        seem to matter on Linux, but it showed up on some releases of OS X.
263    
264     3. It seems that there are systems where bytes whose values are greater than
265        127 match isprint() in the "C" locale. The "C" locale should be the
266        default when a C program starts up. In most systems, only ASCII printing
267        characters match isprint(). This difference caused the output from pcretest
268        to vary, making some of the tests fail. I have changed pcretest so that:
269    
270        (a) When it is outputting text in the compiled version of a pattern, bytes
271            other than 32-126 are always shown as hex escapes.
272    
273        (b) When it is outputting text that is a matched part of a subject string,
274            it does the same, unless a different locale has been set for the match
275            (using the /L modifier). In this case, it uses isprint() to decide.
276    
277     4. Fixed a major bug that caused incorrect computation of the amount of memory
278        required for a compiled pattern when options that changed within the
279        pattern affected the logic of the preliminary scan that determines the
280        length. The relevant options are -x, and -i in UTF-8 mode. The result was
281        that the computed length was too small. The symptoms of this bug were
282        either the PCRE error "internal error: code overflow" from pcre_compile(),
283        or a glibc crash with a message such as "pcretest: free(): invalid next
284        size (fast)". Examples of patterns that provoked this bug (shown in
285        pcretest format) are:
286    
287          /(?-x: )/x
288          /(?x)(?-x: \s*#\s*)/
289          /((?i)[\x{c0}])/8
290          /(?i:[\x{c0}])/8
291    
292        HOWEVER: Change 17 below makes this fix obsolete as the memory computation
293        is now done differently.
294    
295     5. Applied patches from Google to: (a) add a QuoteMeta function to the C++
296        wrapper classes; (b) implement a new function in the C++ scanner that is
297        more efficient than the old way of doing things because it avoids levels of
298        recursion in the regex matching; (c) add a paragraph to the documentation
299        for the FullMatch() function.
300    
301     6. The escape sequence \n was being treated as whatever was defined as
302        "newline". Not only was this contrary to the documentation, which states
303        that \n is character 10 (hex 0A), but it also went horribly wrong when
304        "newline" was defined as CRLF. This has been fixed.
305    
306     7. In pcre_dfa_exec.c the value of an unsigned integer (the variable called c)
307        was being set to -1 for the "end of line" case (supposedly a value that no
308        character can have). Though this value is never used (the check for end of
309        line is "zero bytes in current character"), it caused compiler complaints.
310        I've changed it to 0xffffffff.
311    
312     8. In pcre_version.c, the version string was being built by a sequence of
313        C macros that, in the event of PCRE_PRERELEASE being defined as an empty
314        string (as it is for production releases) called a macro with an empty
315        argument. The C standard says the result of this is undefined. The gcc
316        compiler treats it as an empty string (which was what was wanted) but it is
317        reported that Visual C gives an error. The source has been hacked around to
318        avoid this problem.
319    
320     9. On the advice of a Windows user, included <io.h> and <fcntl.h> in Windows
321        builds of pcretest, and changed the call to _setmode() to use _O_BINARY
322        instead of 0x8000. Made all the #ifdefs test both _WIN32 and WIN32 (not all
323        of them did).
324    
325    10. Originally, pcretest opened its input and output without "b"; then I was
326        told that "b" was needed in some environments, so it was added for release
327        5.0 to both the input and output. (It makes no difference on Unix-like
328        systems.) Later I was told that it is wrong for the input on Windows. I've
329        now abstracted the modes into two macros, to make it easier to fiddle with
330        them, and removed "b" from the input mode under Windows.
331    
332    11. Added pkgconfig support for the C++ wrapper library, libpcrecpp.
333    
334    12. Added -help and --help to pcretest as an official way of being reminded
335        of the options.
336    
337    13. Removed some redundant semicolons after macro calls in pcrecpparg.h.in
338        and pcrecpp.cc because they annoy compilers at high warning levels.
339    
340    14. A bit of tidying/refactoring in pcre_exec.c in the main bumpalong loop.
341    
342    15. Fixed an occurrence of == in configure.ac that should have been = (shell
343        scripts are not C programs :-) and which was not noticed because it works
344        on Linux.
345    
346    16. pcretest is supposed to handle any length of pattern and data line (as one
347        line or as a continued sequence of lines) by extending its input buffer if
348        necessary. This feature was broken for very long pattern lines, leading to
349        a string of junk being passed to pcre_compile() if the pattern was longer
350        than about 50K.
351    
352    17. I have done a major re-factoring of the way pcre_compile() computes the
353        amount of memory needed for a compiled pattern. Previously, there was code
354        that made a preliminary scan of the pattern in order to do this. That was
355        OK when PCRE was new, but as the facilities have expanded, it has become
356        harder and harder to keep it in step with the real compile phase, and there
357        have been a number of bugs (see for example, 4 above). I have now found a
358        cunning way of running the real compile function in a "fake" mode that
359        enables it to compute how much memory it would need, while actually only
360        ever using a few hundred bytes of working memory and without too many
361        tests of the mode. This should make future maintenance and development
362        easier. A side effect of this work is that the limit of 200 on the nesting
363        depth of parentheses has been removed (though this was never a serious
364        limitation, I suspect). However, there is a downside: pcre_compile() now
365        runs more slowly than before (30% or more, depending on the pattern). I
366        hope this isn't a big issue. There is no effect on runtime performance.
367    
368    18. Fixed a minor bug in pcretest: if a pattern line was not terminated by a
369        newline (only possible for the last line of a file) and it was a
370        pattern that set a locale (followed by /Lsomething), pcretest crashed.
371    
372    19. Added additional timing features to pcretest. (1) The -tm option now times
373        matching only, not compiling. (2) Both -t and -tm can be followed, as a
374        separate command line item, by a number that specifies the number of
375        repeats to use when timing. The default is 50000; this gives better
376        precision, but takes uncomfortably long for very large patterns.
377    
378    20. Extended pcre_study() to be more clever in cases where a branch of a
379        subpattern has no definite first character. For example, (a*|b*)[cd] would
380        previously give no result from pcre_study(). Now it recognizes that the
381        first character must be a, b, c, or d.
382    
383    21. There was an incorrect error "recursive call could loop indefinitely" if
384        a subpattern (or the entire pattern) that was being tested for matching an
385        empty string contained only one non-empty item after a nested subpattern.
386        For example, the pattern (?>\x{100}*)\d(?R) provoked this error
387        incorrectly, because the \d was being skipped in the check.
388    
389    22. The pcretest program now has a new pattern option /B and a command line
390        option -b, which is equivalent to adding /B to every pattern. This causes
391        it to show the compiled bytecode, without the additional information that
392        -d shows. The effect of -d is now the same as -b with -i (and similarly, /D
393        is the same as /B/I).
394    
395    23. A new optimization is now able automatically to treat some sequences such
396        as a*b as a*+b. More specifically, if something simple (such as a character
397        or a simple class like \d) has an unlimited quantifier, and is followed by
398        something that cannot possibly match the quantified thing, the quantifier
399        is automatically "possessified".
400    
401    24. A recursive reference to a subpattern whose number was greater than 39
402        went wrong under certain circumstances in UTF-8 mode. This bug could also
403        have affected the operation of pcre_study().
404    
405    25. Realized that a little bit of performance could be had by replacing
406        (c & 0xc0) == 0xc0 with c >= 0xc0 when processing UTF-8 characters.
407    
408    26. Timing data from pcretest is now shown to 4 decimal places instead of 3.
409    
410    27. Possessive quantifiers such as a++ were previously implemented by turning
411        them into atomic groups such as ($>a+). Now they have their own opcodes,
412        which improves performance. This includes the automatically created ones
413        from 23 above.
414    
415    28. A pattern such as (?=(\w+))\1: which simulates an atomic group using a
416        lookahead was broken if it was not anchored. PCRE was mistakenly expecting
417        the first matched character to be a colon. This applied both to named and
418        numbered groups.
419    
420    29. The ucpinternal.h header file was missing its idempotency #ifdef.
421    
422    30. I was sent a "project" file called libpcre.a.dev which I understand makes
423        building PCRE on Windows easier, so I have included it in the distribution.
424    
425    31. There is now a check in pcretest against a ridiculously large number being
426        returned by pcre_exec() or pcre_dfa_exec(). If this happens in a /g or /G
427        loop, the loop is abandoned.
428    
429    32. Forward references to subpatterns in conditions such as (?(2)...) where
430        subpattern 2 is defined later cause pcre_compile() to search forwards in
431        the pattern for the relevant set of parentheses. This search went wrong
432        when there were unescaped parentheses in a character class, parentheses
433        escaped with \Q...\E, or parentheses in a #-comment in /x mode.
434    
435    33. "Subroutine" calls and backreferences were previously restricted to
436        referencing subpatterns earlier in the regex. This restriction has now
437        been removed.
438    
439    34. Added a number of extra features that are going to be in Perl 5.10. On the
440        whole, these are just syntactic alternatives for features that PCRE had
441        previously implemented using the Python syntax or my own invention. The
442        other formats are all retained for compatibility.
443    
444        (a) Named groups can now be defined as (?<name>...) or (?'name'...) as well
445            as (?P<name>...). The new forms, as well as being in Perl 5.10, are
446            also .NET compatible.
447    
448        (b) A recursion or subroutine call to a named group can now be defined as
449            (?&name) as well as (?P>name).
450    
451        (c) A backreference to a named group can now be defined as \k<name> or
452            \k'name' as well as (?P=name). The new forms, as well as being in Perl
453            5.10, are also .NET compatible.
454    
455        (d) A conditional reference to a named group can now use the syntax
456            (?(<name>) or (?('name') as well as (?(name).
457    
458        (e) A "conditional group" of the form (?(DEFINE)...) can be used to define
459            groups (named and numbered) that are never evaluated inline, but can be
460            called as "subroutines" from elsewhere. In effect, the DEFINE condition
461            is always false. There may be only one alternative in such a group.
462    
463        (f) A test for recursion can be given as (?(R1).. or (?(R&name)... as well
464            as the simple (?(R). The condition is true only if the most recent
465            recursion is that of the given number or name. It does not search out
466            through the entire recursion stack.
467    
468        (g) The escape \gN or \g{N} has been added, where N is a positive or
469            negative number, specifying an absolute or relative reference.
470    
471    35. Tidied to get rid of some further signed/unsigned compiler warnings and
472        some "unreachable code" warnings.
473    
474    36. Updated the Unicode property tables to Unicode version 5.0.0. Amongst other
475        things, this adds five new scripts.
476    
477    37. Perl ignores orphaned \E escapes completely. PCRE now does the same.
478        There were also incompatibilities regarding the handling of \Q..\E inside
479        character classes, for example with patterns like [\Qa\E-\Qz\E] where the
480        hyphen was adjacent to \Q or \E. I hope I've cleared all this up now.
481    
482    38. Like Perl, PCRE detects when an indefinitely repeated parenthesized group
483        matches an empty string, and forcibly breaks the loop. There were bugs in
484        this code in non-simple cases. For a pattern such as  ^(a()*)*  matched
485        against  aaaa  the result was just "a" rather than "aaaa", for example. Two
486        separate and independent bugs (that affected different cases) have been
487        fixed.
488    
489    39. Refactored the code to abolish the use of different opcodes for small
490        capturing bracket numbers. This is a tidy that I avoided doing when I
491        removed the limit on the number of capturing brackets for 3.5 back in 2001.
492        The new approach is not only tidier, it makes it possible to reduce the
493        memory needed to fix the previous bug (38).
494    
495    40. Implemented PCRE_NEWLINE_ANY to recognize any of the Unicode newline
496        sequences (http://unicode.org/unicode/reports/tr18/) as "newline" when
497        processing dot, circumflex, or dollar metacharacters, or #-comments in /x
498        mode.
499    
500    41. Add \R to match any Unicode newline sequence, as suggested in the Unicode
501        report.
502    
503    42. Applied patch, originally from Ari Pollak, modified by Google, to allow
504        copy construction and assignment in the C++ wrapper.
505    
506    43. Updated pcregrep to support "--newline=any". In the process, I fixed a
507        couple of bugs that could have given wrong results in the "--newline=crlf"
508        case.
509    
510    44. Added a number of casts and did some reorganization of signed/unsigned int
511        variables following suggestions from Dair Grant. Also renamed the variable
512        "this" as "item" because it is a C++ keyword.
513    
514    45. Arranged for dftables to add
515    
516          #include "pcre_internal.h"
517    
518        to pcre_chartables.c because without it, gcc 4.x may remove the array
519        definition from the final binary if PCRE is built into a static library and
520        dead code stripping is activated.
521    
522    46. For an unanchored pattern, if a match attempt fails at the start of a
523        newline sequence, and the newline setting is CRLF or ANY, and the next two
524        characters are CRLF, advance by two characters instead of one.
525    
526    
527  Version 6.7 04-Jul-06  Version 6.7 04-Jul-06
528  ---------------------  ---------------------
529    

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