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revision 79 by nigel, Sat Feb 24 21:40:52 2007 UTC revision 390 by ph10, Tue Mar 17 10:58:16 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 7.9 xx-xxx-09
5    ---------------------
6    
7    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
8        (pcretest), all targets were linked against these libraries. This included
9        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
10        libraries. This caused unwanted dependencies to be created. This problem
11        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
12        pcretest is linked with readline.
13    
14    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
15        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
16        moved outside it again, because FALSE and TRUE are already defined in AIX,
17        but BOOL is not.
18    
19    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
20        PCRE_MATCH_LIMIT_RETURSION values as ints, when they should be long ints.
21    
22    4.  The pcregrep documentation said spaces were inserted as well as colons (or
23        hyphens) following file names and line numbers when outputting matching
24        lines. This is not true; no spaces are inserted. I have also clarified the
25        wording for the --colour (or --color) option.
26    
27    5.  In pcregrep, when --colour was used with -o, the list of matching strings
28        was not coloured; this is different to GNU grep, so I have changed it to be
29        the same.
30    
31    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
32        each matching line was coloured. Now it goes on to look for further matches
33        of any of the test patterns, which is the same behaviour as GNU grep.
34    
35    7.  A pattern that could match an empty string could cause pcregrep to loop; it
36        doesn't make sense to accept an empty string match in pcregrep, so I have
37        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
38        seems to be how GNU grep behaves.
39    
40    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
41        start or after a newline", because the conditional assertion was not being
42        correctly handled. The rule now is that both the assertion and what follows
43        in the first alternative must satisfy the test.
44    
45    9.  If auto-callout was enabled in a pattern with a conditional group, PCRE
46        could crash during matching.
47    
48    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
49        used for matching.
50    
51    11. Unicode property support in character classes was not working for
52        characters (bytes) greater than 127 when not in UTF-8 mode.
53    
54    12. Added the -M command line option to pcretest.
55    
56    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
57    
58    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
59    
60    16. Added comments and documentation about mis-use of no_arg in the C++
61        wrapper.
62    
63    
64    Version 7.8 05-Sep-08
65    ---------------------
66    
67    1.  Replaced UCP searching code with optimized version as implemented for Ad
68        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
69        stage table and inline lookup instead of a function, giving speed ups of 2
70        to 5 times on some simple patterns that I tested. Permission was given to
71        distribute the MultiStage2.py script that generates the tables (it's not in
72        the tarball, but is in the Subversion repository).
73    
74    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
75        scripts.
76    
77    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
78        a group with a zero qualifier. The result of the study could be incorrect,
79        or the function might crash, depending on the pattern.
80    
81    4.  Caseless matching was not working for non-ASCII characters in back
82        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
83        It now works when Unicode Property Support is available.
84    
85    5.  In pcretest, an escape such as \x{de} in the data was always generating
86        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
87        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
88        truncation.
89    
90    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
91    
92    7.  Added two (int) casts to pcregrep when printing the difference of two
93        pointers, in case they are 64-bit values.
94    
95    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
96        test 2 if it fails.
97    
98    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
99        and a #define of that name to empty if it is not externally set. This is to
100        allow users of MSVC to set it if necessary.
101    
102    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
103        the convenience functions in the pcre_get.c source file.
104    
105    11. An option change at the start of a pattern that had top-level alternatives
106        could cause overwriting and/or a crash. This command provoked a crash in
107        some environments:
108    
109          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
110    
111        This potential security problem was recorded as CVE-2008-2371.
112    
113    12. For a pattern where the match had to start at the beginning or immediately
114        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
115        pcre_dfa_exec() could read past the end of the passed subject if there was
116        no match. To help with detecting such bugs (e.g. with valgrind), I modified
117        pcretest so that it places the subject at the end of its malloc-ed buffer.
118    
119    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
120        exec() might read past the end of the data buffer in UTF-8 mode.
121    
122    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
123        the data contained the byte 0x85 as part of a UTF-8 character within its
124        first line. This applied both to normal and DFA matching.
125    
126    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
127        /^[^d]*?$/8 failed to match "abc".
128    
129    16. Added a missing copyright notice to pcrecpp_internal.h.
130    
131    17. Make it more clear in the documentation that values returned from
132        pcre_exec() in ovector are byte offsets, not character counts.
133    
134    18. Tidied a few places to stop certain compilers from issuing warnings.
135    
136    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
137        supplied by Stefan Weber. I made a further small update for 7.8 because
138        there is a change of source arrangements: the pcre_searchfuncs.c module is
139        replaced by pcre_ucd.c.
140    
141    
142    Version 7.7 07-May-08
143    ---------------------
144    
145    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
146        a string to a long long, pretend we don't even have a long long." This is
147        done by checking for the strtoq, strtoll, and _strtoi64 functions.
148    
149    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
150        pre-7.6 versions, which defined a global no_arg variable instead of putting
151        it in the RE class. (See also #8 below.)
152    
153    3.  Remove a line of dead code, identified by coverity and reported by Nuno
154        Lopes.
155    
156    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
157    
158        (1) The include/exclude patterns were being applied to the whole pathnames
159            of files, instead of just to the final components.
160    
161        (2) If there was more than one level of directory, the subdirectories were
162            skipped unless they satisfied the include/exclude conditions. This is
163            inconsistent with GNU grep (and could even be seen as contrary to the
164            pcregrep specification - which I improved to make it absolutely clear).
165            The action now is always to scan all levels of directory, and just
166            apply the include/exclude patterns to regular files.
167    
168    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
169        --exclude_dir in the tests to avoid scanning .svn directories.
170    
171    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
172        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
173        doesn't support NULs in patterns.
174    
175    7.  Added some missing "const"s to declarations of static tables in
176        pcre_compile.c and pcre_dfa_exec.c.
177    
178    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
179        caused by fix #2  above. (Subsequently also a second patch to fix the
180        first patch. And a third patch - this was a messy problem.)
181    
182    9.  Applied Craig's patch to remove the use of push_back().
183    
184    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
185        matching function regexec().
186    
187    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
188        which, however, unlike Perl's \g{...}, are subroutine calls, not back
189        references. PCRE supports relative numbers with this syntax (I don't think
190        Oniguruma does).
191    
192    12. Previously, a group with a zero repeat such as (...){0} was completely
193        omitted from the compiled regex. However, this means that if the group
194        was called as a subroutine from elsewhere in the pattern, things went wrong
195        (an internal error was given). Such groups are now left in the compiled
196        pattern, with a new opcode that causes them to be skipped at execution
197        time.
198    
199    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
200        to the way PCRE behaves:
201    
202        (a) A lone ] character is dis-allowed (Perl treats it as data).
203    
204        (b) A back reference to an unmatched subpattern matches an empty string
205            (Perl fails the current match path).
206    
207        (c) A data ] in a character class must be notated as \] because if the
208            first data character in a class is ], it defines an empty class. (In
209            Perl it is not possible to have an empty class.) The empty class []
210            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
211            The negative empty class [^] matches any one character, independently
212            of the DOTALL setting.
213    
214    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
215        non-existent subpattern following a character class starting with ']' and
216        containing () gave an internal compiling error instead of "reference to
217        non-existent subpattern". Fortunately, when the pattern did exist, the
218        compiled code was correct. (When scanning forwards to check for the
219        existencd of the subpattern, it was treating the data ']' as terminating
220        the class, so got the count wrong. When actually compiling, the reference
221        was subsequently set up correctly.)
222    
223    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
224        it was being rejected as not supported by pcre_dfa_exec(), even though
225        other assertions are supported. I have made pcre_dfa_exec() support
226        (*FAIL).
227    
228    16. The implementation of 13c above involved the invention of a new opcode,
229        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
230        cannot be changed at match time, I realized I could make a small
231        improvement to matching performance by compiling OP_ALLANY instead of
232        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
233        on the OP_ANY path.
234    
235    17. Compiling pcretest on Windows with readline support failed without the
236        following two fixes: (1) Make the unistd.h include conditional on
237        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
238    
239    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
240        ncurses library to be included for pcretest when ReadLine support is
241        requested, but also to allow for it to be overridden. This patch came from
242        Daniel Bergström.
243    
244    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
245        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
246        any errors with the current Unicode tables. Thanks to Peter Kankowski for
247        spotting this.
248    
249    
250    Version 7.6 28-Jan-08
251    ---------------------
252    
253    1.  A character class containing a very large number of characters with
254        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
255        overflow.
256    
257    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
258        HAVE_LONG_LONG is not defined.
259    
260    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
261        bring them up to date and include new features. This patch includes:
262    
263        - Fixed PH's badly added libz and libbz2 support.
264        - Fixed a problem with static linking.
265        - Added pcredemo. [But later removed - see 7 below.]
266        - Fixed dftables problem and added an option.
267        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
268            HAVE_LONG_LONG.
269        - Added readline support for pcretest.
270        - Added an listing of the option settings after cmake has run.
271    
272    4.  A user submitted a patch to Makefile that makes it easy to create
273        "pcre.dll" under mingw when using Configure/Make. I added stuff to
274        Makefile.am that cause it to include this special target, without
275        affecting anything else. Note that the same mingw target plus all
276        the other distribution libraries and programs are now supported
277        when configuring with CMake (see 6 below) instead of with
278        Configure/Make.
279    
280    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
281        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
282        exported in the Windows port". It has not yet been confirmed that the patch
283        solves the problem, but it does no harm.
284    
285    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
286        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
287        with CMake, and also correct the comment about stack recursion.
288    
289    7.  Remove the automatic building of pcredemo from the ./configure system and
290        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
291        of a program that users should build themselves after PCRE is installed, so
292        building it automatically is not really right. What is more, it gave
293        trouble in some build environments.
294    
295    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
296    
297    
298    Version 7.5 10-Jan-08
299    ---------------------
300    
301    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
302        values in parens when parsing an RE using the C++ wrapper."
303    
304    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
305        Characters greater than 255 were excluded from the class instead of being
306        included.
307    
308    3.  The same bug as (2) above applied to negated POSIX classes such as
309        [:^space:].
310    
311    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
312        defined or documented. It seems to have been a typo for PCRE_STATIC, so
313        I have changed it.
314    
315    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
316        first named subpattern) and a construct such as (?&a) would reference the
317        first named subpattern whose name started with "a" (in other words, the
318        length check was missing). Both these problems are fixed. "Subpattern name
319        expected" is now given for (?&) (a zero-length name), and this patch also
320        makes it give the same error for \k'' (previously it complained that that
321        was a reference to a non-existent subpattern).
322    
323    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
324        this is right because (?- can be followed by option settings as well as by
325        digits. I have, however, made the messages clearer.
326    
327    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
328        than the number used in the conditional) now cause a compile-time error.
329        This is actually not compatible with Perl, which accepts such patterns, but
330        treats the conditional as always being FALSE (as PCRE used to), but it
331        seems to me that giving a diagnostic is better.
332    
333    8.  Change "alphameric" to the more common word "alphanumeric" in comments
334        and messages.
335    
336    9.  Fix two occurrences of "backslash" in comments that should have been
337        "backspace".
338    
339    10. Remove two redundant lines of code that can never be obeyed (their function
340        was moved elsewhere).
341    
342    11. The program that makes PCRE's Unicode character property table had a bug
343        which caused it to generate incorrect table entries for sequences of
344        characters that have the same character type, but are in different scripts.
345        It amalgamated them into a single range, with the script of the first of
346        them. In other words, some characters were in the wrong script. There were
347        thirteen such cases, affecting characters in the following ranges:
348    
349          U+002b0 - U+002c1
350          U+0060c - U+0060d
351          U+0061e - U+00612
352          U+0064b - U+0065e
353          U+0074d - U+0076d
354          U+01800 - U+01805
355          U+01d00 - U+01d77
356          U+01d9b - U+01dbf
357          U+0200b - U+0200f
358          U+030fc - U+030fe
359          U+03260 - U+0327f
360          U+0fb46 - U+0fbb1
361          U+10450 - U+1049d
362    
363    12. The -o option (show only the matching part of a line) for pcregrep was not
364        compatible with GNU grep in that, if there was more than one match in a
365        line, it showed only the first of them. It now behaves in the same way as
366        GNU grep.
367    
368    13. If the -o and -v options were combined for pcregrep, it printed a blank
369        line for every non-matching line. GNU grep prints nothing, and pcregrep now
370        does the same. The return code can be used to tell if there were any
371        non-matching lines.
372    
373    14. Added --file-offsets and --line-offsets to pcregrep.
374    
375    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
376        infinitely looping recursion. The bug was that positive lookaheads were not
377        being skipped when checking for a possible empty match (negative lookaheads
378        and both kinds of lookbehind were skipped).
379    
380    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
381        inclusion of <windows.h> to before rather than after the definition of
382        INVALID_FILE_ATTRIBUTES (patch from David Byron).
383    
384    17. Specifying a possessive quantifier with a specific limit for a Unicode
385        character property caused pcre_compile() to compile bad code, which led at
386        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
387        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
388        caused the error; without that there was no problem.
389    
390    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
391    
392    19. Added --enable-pcretest-libreadline.
393    
394    20. In pcrecpp.cc, the variable 'count' was incremented twice in
395        RE::GlobalReplace(). As a result, the number of replacements returned was
396        double what it should be. I removed one of the increments, but Craig sent a
397        later patch that removed the other one (the right fix) and added unit tests
398        that check the return values (which was not done before).
399    
400    21. Several CMake things:
401    
402        (1) Arranged that, when cmake is used on Unix, the libraries end up with
403            the names libpcre and libpcreposix, not just pcre and pcreposix.
404    
405        (2) The above change means that pcretest and pcregrep are now correctly
406            linked with the newly-built libraries, not previously installed ones.
407    
408        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
409    
410    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
411        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
412        UTF-8 newline character). The key issue is that the pattern starts .*;
413        this means that the match must be either at the beginning, or after a
414        newline. The bug was in the code for advancing after a failed match and
415        checking that the new position followed a newline. It was not taking
416        account of UTF-8 characters correctly.
417    
418    23. PCRE was behaving differently from Perl in the way it recognized POSIX
419        character classes. PCRE was not treating the sequence [:...:] as a
420        character class unless the ... were all letters. Perl, however, seems to
421        allow any characters between [: and :], though of course it rejects as
422        unknown any "names" that contain non-letters, because all the known class
423        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
424        for example, whereas PCRE did not - it did not recognize a POSIX character
425        class. This seemed a bit dangerous, so the code has been changed to be
426        closer to Perl. The behaviour is not identical to Perl, because PCRE will
427        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
428        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
429        Perl does, and where it didn't before.
430    
431    24. Rewrite so as to remove the single use of %n from pcregrep because in some
432        Windows environments %n is disabled by default.
433    
434    
435    Version 7.4 21-Sep-07
436    ---------------------
437    
438    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
439        means that a class such as [\s] counted as "explicit reference to CR or
440        LF". That isn't really right - the whole point of the change was to try to
441        help when there was an actual mention of one of the two characters. So now
442        the change happens only if \r or \n (or a literal CR or LF) character is
443        encountered.
444    
445    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
446        of both had grown to the point where there were only 3 bits left.
447        Fortunately, there was spare space in the data structure, and so I have
448        moved the internal flags into a new 16-bit field to free up more option
449        bits.
450    
451    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
452        but did not set the internal JCHANGED flag - either of these is enough to
453        control the way the "get" function works - but the PCRE_INFO_JCHANGED
454        facility is supposed to tell if (?J) was ever used, so now (?J) at the
455        start sets both bits.
456    
457    4.  Added options (at build time, compile time, exec time) to change \R from
458        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
459    
460    5.  doc/pcresyntax.html was missing from the distribution.
461    
462    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
463        compatibility, even though it is no longer used.
464    
465    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
466        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
467        windows.h file is present (where different names are used). [This was
468        reversed later after testing - see 16 below.]
469    
470    8.  Changed all #include <config.h> to #include "config.h". There were also
471        some further <pcre.h> cases that I changed to "pcre.h".
472    
473    9.  When pcregrep was used with the --colour option, it missed the line ending
474        sequence off the lines that it output.
475    
476    10. It was pointed out to me that arrays of string pointers cause lots of
477        relocations when a shared library is dynamically loaded. A technique of
478        using a single long string with a table of offsets can drastically reduce
479        these. I have refactored PCRE in four places to do this. The result is
480        dramatic:
481    
482          Originally:                          290
483          After changing UCP table:            187
484          After changing error message table:   43
485          After changing table of "verbs"       36
486          After changing table of Posix names   22
487    
488        Thanks to the folks working on Gregex for glib for this insight.
489    
490    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
491        unicode-properties was also set.
492    
493    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
494    
495    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
496        checked only for CRLF.
497    
498    14. Added casts to pcretest.c to avoid compiler warnings.
499    
500    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
501    
502    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
503        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
504        entirely. This removes changes made in 7 above.
505    
506    17. The CMake files have been updated, and there is now more information about
507        building with CMake in the NON-UNIX-USE document.
508    
509    
510    Version 7.3 28-Aug-07
511    ---------------------
512    
513     1. In the rejigging of the build system that eventually resulted in 7.1, the
514        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
515        brackets there is not right, since it causes compilers to look for an
516        installed pcre.h, not the version that is in the source that is being
517        compiled (which of course may be different). I have changed it back to:
518    
519          #include "pcre.h"
520    
521        I have a vague recollection that the change was concerned with compiling in
522        different directories, but in the new build system, that is taken care of
523        by the VPATH setting the Makefile.
524    
525     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
526        when the subject happened to end in the byte 0x85 (e.g. if the last
527        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
528        characters but of course it shouldn't be taken as a newline when it is part
529        of another character. The bug was that, for an unlimited repeat of . in
530        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
531        characters when looking for a newline.
532    
533     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
534    
535     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
536        in debug output.
537    
538     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
539        long printing in the pcrecpp unittest when running under MinGW.
540    
541     6. ESC_K was left out of the EBCDIC table.
542    
543     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
544        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
545        limit also applies to "virtual nesting" when a pattern is recursive, and in
546        this case 1000 isn't so big. I have been able to remove this limit at the
547        expense of backing off one optimization in certain circumstances. Normally,
548        when pcre_exec() would call its internal match() function recursively and
549        immediately return the result unconditionally, it uses a "tail recursion"
550        feature to save stack. However, when a subpattern that can match an empty
551        string has an unlimited repetition quantifier, it no longer makes this
552        optimization. That gives it a stack frame in which to save the data for
553        checking that an empty string has been matched. Previously this was taken
554        from the 1000-entry workspace that had been reserved. So now there is no
555        explicit limit, but more stack is used.
556    
557     8. Applied Daniel's patches to solve problems with the import/export magic
558        syntax that is required for Windows, and which was going wrong for the
559        pcreposix and pcrecpp parts of the library. These were overlooked when this
560        problem was solved for the main library.
561    
562     9. There were some crude static tests to avoid integer overflow when computing
563        the size of patterns that contain repeated groups with explicit upper
564        limits. As the maximum quantifier is 65535, the maximum group length was
565        set at 30,000 so that the product of these two numbers did not overflow a
566        32-bit integer. However, it turns out that people want to use groups that
567        are longer than 30,000 bytes (though not repeat them that many times).
568        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
569        made it possible to implement the integer overflow checks in a much more
570        dynamic way, which I have now done. The artificial limitation on group
571        length has been removed - we now have only the limit on the total length of
572        the compiled pattern, which depends on the LINK_SIZE setting.
573    
574    10. Fixed a bug in the documentation for get/copy named substring when
575        duplicate names are permitted. If none of the named substrings are set, the
576        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
577        empty string.
578    
579    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
580        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
581        because the ] is interpreted as the first data character and the
582        terminating ] is not found. PCRE has been made compatible with Perl in this
583        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
584        cause memory overwriting.
585    
586    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
587        string has been matched (to stop an infinite loop). It was not recognizing
588        a conditional subpattern that could match an empty string if that
589        subpattern was within another subpattern. For example, it looped when
590        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
591        condition was not nested. This bug has been fixed.
592    
593    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
594        past the start of the subject in the presence of bytes with the top bit
595        set, for example "\x8aBCD".
596    
597    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
598        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
599    
600    14. Optimized (?!) to (*FAIL).
601    
602    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
603        This restricts code points to be within the range 0 to 0x10FFFF, excluding
604        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
605        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
606        does: it's just the validity check that is more restrictive.
607    
608    16. Inserted checks for integer overflows during escape sequence (backslash)
609        processing, and also fixed erroneous offset values for syntax errors during
610        backslash processing.
611    
612    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
613        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
614    
615    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
616        caused an overrun.
617    
618    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
619        something other than just ASCII characters) inside a group that had an
620        unlimited repeat caused a loop at compile time (while checking to see
621        whether the group could match an empty string).
622    
623    20. Debugging a pattern containing \p or \P could cause a crash. For example,
624        [\P{Any}] did so. (Error in the code for printing property names.)
625    
626    21. An orphan \E inside a character class could cause a crash.
627    
628    22. A repeated capturing bracket such as (A)? could cause a wild memory
629        reference during compilation.
630    
631    23. There are several functions in pcre_compile() that scan along a compiled
632        expression for various reasons (e.g. to see if it's fixed length for look
633        behind). There were bugs in these functions when a repeated \p or \P was
634        present in the pattern. These operators have additional parameters compared
635        with \d, etc, and these were not being taken into account when moving along
636        the compiled data. Specifically:
637    
638        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
639            length.
640    
641        (b) An item such as \pL+ within a repeated group could cause crashes or
642            loops.
643    
644        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
645            "reference to non-existent subpattern" error.
646    
647        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
648    
649    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
650        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
651    
652    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
653    
654    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
655        character were causing crashes (broken optimization).
656    
657    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
658        \p or \P) caused a compile-time loop.
659    
660    28. More problems have arisen in unanchored patterns when CRLF is a valid line
661        break. For example, the unstudied pattern [\r\n]A does not match the string
662        "\r\nA" because change 7.0/46 below moves the current point on by two
663        characters after failing to match at the start. However, the pattern \nA
664        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
665        the same is true. There doesn't seem any very clean way out of this, but
666        what I have chosen to do makes the common cases work: PCRE now takes note
667        of whether there can be an explicit match for \r or \n anywhere in the
668        pattern, and if so, 7.0/46 no longer applies. As part of this change,
669        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
670        pattern has explicit CR or LF references.
671    
672    29. Added (*CR) etc for changing newline setting at start of pattern.
673    
674    
675    Version 7.2 19-Jun-07
676    ---------------------
677    
678     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
679        which is apparently normally available under Windows.
680    
681     2. Re-jig the pcregrep tests with different newline settings in an attempt
682        to make them independent of the local environment's newline setting.
683    
684     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
685    
686     4. Some of the "internals" tests were previously cut out when the link size
687        was not 2, because the output contained actual offsets. The recent new
688        "Z" feature of pcretest means that these can be cut out, making the tests
689        usable with all link sizes.
690    
691     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
692        stack recursion. This gives a massive performance boost under BSD, but just
693        a small improvement under Linux. However, it saves one field in the frame
694        in all cases.
695    
696     6. Added more features from the forthcoming Perl 5.10:
697    
698        (a) (?-n) (where n is a string of digits) is a relative subroutine or
699            recursion call. It refers to the nth most recently opened parentheses.
700    
701        (b) (?+n) is also a relative subroutine call; it refers to the nth next
702            to be opened parentheses.
703    
704        (c) Conditions that refer to capturing parentheses can be specified
705            relatively, for example, (?(-2)... or (?(+3)...
706    
707        (d) \K resets the start of the current match so that everything before
708            is not part of it.
709    
710        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
711    
712        (f) \g{name} is another synonym - part of Perl 5.10's unification of
713            reference syntax.
714    
715        (g) (?| introduces a group in which the numbering of parentheses in each
716            alternative starts with the same number.
717    
718        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
719    
720     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
721        PCRE_INFO_JCHANGED.
722    
723     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
724        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
725        for detecting groups that can match an empty string.
726    
727     9. A pattern with a very large number of alternatives (more than several
728        hundred) was running out of internal workspace during the pre-compile
729        phase, where pcre_compile() figures out how much memory will be needed. A
730        bit of new cunning has reduced the workspace needed for groups with
731        alternatives. The 1000-alternative test pattern now uses 12 bytes of
732        workspace instead of running out of the 4096 that are available.
733    
734    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
735    
736    11. Applied patch from Google to remove an optimization that didn't quite work.
737        The report of the bug said:
738    
739          pcrecpp::RE("a*").FullMatch("aaa") matches, while
740          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
741          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
742    
743    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
744        it matched the wrong number of bytes.
745    
746    
747    Version 7.1 24-Apr-07
748    ---------------------
749    
750     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
751        that is more "standard", making use of automake and other Autotools. There
752        is some re-arrangement of the files and adjustment of comments consequent
753        on this.
754    
755     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
756        for recursive directory scanning broke on some systems because the files
757        are not scanned in any specific order and on different systems the order
758        was different. A call to "sort" has been inserted into RunGrepTest for the
759        approprate test as a short-term fix. In the longer term there may be an
760        alternative.
761    
762     3. I had an email from Eric Raymond about problems translating some of PCRE's
763        man pages to HTML (despite the fact that I distribute HTML pages, some
764        people do their own conversions for various reasons). The problems
765        concerned the use of low-level troff macros .br and .in. I have therefore
766        removed all such uses from the man pages (some were redundant, some could
767        be replaced by .nf/.fi pairs). The 132html script that I use to generate
768        HTML has been updated to handle .nf/.fi and to complain if it encounters
769        .br or .in.
770    
771     4. Updated comments in configure.ac that get placed in config.h.in and also
772        arranged for config.h to be included in the distribution, with the name
773        config.h.generic, for the benefit of those who have to compile without
774        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
775    
776     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
777        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
778        makevp.bat for the current PCRE, using the additional files
779        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
780    
781     6. A Windows user reported a minor discrepancy with test 2, which turned out
782        to be caused by a trailing space on an input line that had got lost in his
783        copy. The trailing space was an accident, so I've just removed it.
784    
785     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
786        that is needed.
787    
788     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
789        as "const" (a) because they are and (b) because it helps the PHP
790        maintainers who have recently made a script to detect big data structures
791        in the php code that should be moved to the .rodata section. I remembered
792        to update Builducptable as well, so it won't revert if ucptable.h is ever
793        re-created.
794    
795     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
796        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
797        order to be able to cut out the UTF-8 tables in the latter when UTF-8
798        support is not required. This saves 1.5-2K of code, which is important in
799        some applications.
800    
801        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
802        so as not to refer to the tables, even though these functions will never be
803        called when UTF-8 support is disabled. Otherwise there are problems with a
804        shared library.
805    
806    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
807    
808        (a) It was defining its arguments as char * instead of void *.
809    
810        (b) It was assuming that all moves were upwards in memory; this was true
811            a long time ago when I wrote it, but is no longer the case.
812    
813        The emulated memove() is provided for those environments that have neither
814        memmove() nor bcopy(). I didn't think anyone used it these days, but that
815        is clearly not the case, as these two bugs were recently reported.
816    
817    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
818        and Detrail to create the HTML documentation, the .txt form of the man
819        pages, and it removes trailing spaces from listed files. It also creates
820        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
821        case, it wraps all the #defines with #ifndefs. This script should be run
822        before "make dist".
823    
824    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
825        with Unicode property support.
826    
827        (a) For a maximizing quantifier, if the two different cases of the
828            character were of different lengths in their UTF-8 codings (there are
829            some cases like this - I found 11), and the matching function had to
830            back up over a mixture of the two cases, it incorrectly assumed they
831            were both the same length.
832    
833        (b) When PCRE was configured to use the heap rather than the stack for
834            recursion during matching, it was not correctly preserving the data for
835            the other case of a UTF-8 character when checking ahead for a match
836            while processing a minimizing repeat. If the check also involved
837            matching a wide character, but failed, corruption could cause an
838            erroneous result when trying to check for a repeat of the original
839            character.
840    
841    13. Some tidying changes to the testing mechanism:
842    
843        (a) The RunTest script now detects the internal link size and whether there
844            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
845            values substituted by "configure". (The RunGrepTest script already did
846            this for UTF-8.) The configure.ac script no longer substitutes the
847            relevant variables.
848    
849        (b) The debugging options /B and /D in pcretest show the compiled bytecode
850            with length and offset values. This means that the output is different
851            for different internal link sizes. Test 2 is skipped for link sizes
852            other than 2 because of this, bypassing the problem. Unfortunately,
853            there was also a test in test 3 (the locale tests) that used /B and
854            failed for link sizes other than 2. Rather than cut the whole test out,
855            I have added a new /Z option to pcretest that replaces the length and
856            offset values with spaces. This is now used to make test 3 independent
857            of link size. (Test 2 will be tidied up later.)
858    
859    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
860        segmentation fault instead of returning the appropriate error message.
861    
862    15. In multiline mode when the newline sequence was set to "any", the pattern
863        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
864        This doesn't seem right; it now treats the CRLF combination as the line
865        ending, and so does not match in that case. It's only a pattern such as ^$
866        that would hit this one: something like ^ABC$ would have failed after \r
867        and then tried again after \r\n.
868    
869    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
870        in an attempt to make files that differ only in their line terminators
871        compare equal. This works on Linux.
872    
873    17. Under certain error circumstances pcregrep might try to free random memory
874        as it exited. This is now fixed, thanks to valgrind.
875    
876    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
877        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
878        was because its rules for how to advance for /g after matching an empty
879        string at the end of a line did not allow for this case. They now check for
880        it specially.
881    
882    20. pcretest is supposed to handle patterns and data of any length, by
883        extending its buffers when necessary. It was getting this wrong when the
884        buffer for a data line had to be extended.
885    
886    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
887        CRLF as a newline sequence.
888    
889    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
890        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
891        I have nevertheless tidied it up.
892    
893    23. Added some casts to kill warnings from HP-UX ia64 compiler.
894    
895    24. Added a man page for pcre-config.
896    
897    
898    Version 7.0 19-Dec-06
899    ---------------------
900    
901     1. Fixed a signed/unsigned compiler warning in pcre_compile.c, shown up by
902        moving to gcc 4.1.1.
903    
904     2. The -S option for pcretest uses setrlimit(); I had omitted to #include
905        sys/time.h, which is documented as needed for this function. It doesn't
906        seem to matter on Linux, but it showed up on some releases of OS X.
907    
908     3. It seems that there are systems where bytes whose values are greater than
909        127 match isprint() in the "C" locale. The "C" locale should be the
910        default when a C program starts up. In most systems, only ASCII printing
911        characters match isprint(). This difference caused the output from pcretest
912        to vary, making some of the tests fail. I have changed pcretest so that:
913    
914        (a) When it is outputting text in the compiled version of a pattern, bytes
915            other than 32-126 are always shown as hex escapes.
916    
917        (b) When it is outputting text that is a matched part of a subject string,
918            it does the same, unless a different locale has been set for the match
919            (using the /L modifier). In this case, it uses isprint() to decide.
920    
921     4. Fixed a major bug that caused incorrect computation of the amount of memory
922        required for a compiled pattern when options that changed within the
923        pattern affected the logic of the preliminary scan that determines the
924        length. The relevant options are -x, and -i in UTF-8 mode. The result was
925        that the computed length was too small. The symptoms of this bug were
926        either the PCRE error "internal error: code overflow" from pcre_compile(),
927        or a glibc crash with a message such as "pcretest: free(): invalid next
928        size (fast)". Examples of patterns that provoked this bug (shown in
929        pcretest format) are:
930    
931          /(?-x: )/x
932          /(?x)(?-x: \s*#\s*)/
933          /((?i)[\x{c0}])/8
934          /(?i:[\x{c0}])/8
935    
936        HOWEVER: Change 17 below makes this fix obsolete as the memory computation
937        is now done differently.
938    
939     5. Applied patches from Google to: (a) add a QuoteMeta function to the C++
940        wrapper classes; (b) implement a new function in the C++ scanner that is
941        more efficient than the old way of doing things because it avoids levels of
942        recursion in the regex matching; (c) add a paragraph to the documentation
943        for the FullMatch() function.
944    
945     6. The escape sequence \n was being treated as whatever was defined as
946        "newline". Not only was this contrary to the documentation, which states
947        that \n is character 10 (hex 0A), but it also went horribly wrong when
948        "newline" was defined as CRLF. This has been fixed.
949    
950     7. In pcre_dfa_exec.c the value of an unsigned integer (the variable called c)
951        was being set to -1 for the "end of line" case (supposedly a value that no
952        character can have). Though this value is never used (the check for end of
953        line is "zero bytes in current character"), it caused compiler complaints.
954        I've changed it to 0xffffffff.
955    
956     8. In pcre_version.c, the version string was being built by a sequence of
957        C macros that, in the event of PCRE_PRERELEASE being defined as an empty
958        string (as it is for production releases) called a macro with an empty
959        argument. The C standard says the result of this is undefined. The gcc
960        compiler treats it as an empty string (which was what was wanted) but it is
961        reported that Visual C gives an error. The source has been hacked around to
962        avoid this problem.
963    
964     9. On the advice of a Windows user, included <io.h> and <fcntl.h> in Windows
965        builds of pcretest, and changed the call to _setmode() to use _O_BINARY
966        instead of 0x8000. Made all the #ifdefs test both _WIN32 and WIN32 (not all
967        of them did).
968    
969    10. Originally, pcretest opened its input and output without "b"; then I was
970        told that "b" was needed in some environments, so it was added for release
971        5.0 to both the input and output. (It makes no difference on Unix-like
972        systems.) Later I was told that it is wrong for the input on Windows. I've
973        now abstracted the modes into two macros, to make it easier to fiddle with
974        them, and removed "b" from the input mode under Windows.
975    
976    11. Added pkgconfig support for the C++ wrapper library, libpcrecpp.
977    
978    12. Added -help and --help to pcretest as an official way of being reminded
979        of the options.
980    
981    13. Removed some redundant semicolons after macro calls in pcrecpparg.h.in
982        and pcrecpp.cc because they annoy compilers at high warning levels.
983    
984    14. A bit of tidying/refactoring in pcre_exec.c in the main bumpalong loop.
985    
986    15. Fixed an occurrence of == in configure.ac that should have been = (shell
987        scripts are not C programs :-) and which was not noticed because it works
988        on Linux.
989    
990    16. pcretest is supposed to handle any length of pattern and data line (as one
991        line or as a continued sequence of lines) by extending its input buffer if
992        necessary. This feature was broken for very long pattern lines, leading to
993        a string of junk being passed to pcre_compile() if the pattern was longer
994        than about 50K.
995    
996    17. I have done a major re-factoring of the way pcre_compile() computes the
997        amount of memory needed for a compiled pattern. Previously, there was code
998        that made a preliminary scan of the pattern in order to do this. That was
999        OK when PCRE was new, but as the facilities have expanded, it has become
1000        harder and harder to keep it in step with the real compile phase, and there
1001        have been a number of bugs (see for example, 4 above). I have now found a
1002        cunning way of running the real compile function in a "fake" mode that
1003        enables it to compute how much memory it would need, while actually only
1004        ever using a few hundred bytes of working memory and without too many
1005        tests of the mode. This should make future maintenance and development
1006        easier. A side effect of this work is that the limit of 200 on the nesting
1007        depth of parentheses has been removed (though this was never a serious
1008        limitation, I suspect). However, there is a downside: pcre_compile() now
1009        runs more slowly than before (30% or more, depending on the pattern). I
1010        hope this isn't a big issue. There is no effect on runtime performance.
1011    
1012    18. Fixed a minor bug in pcretest: if a pattern line was not terminated by a
1013        newline (only possible for the last line of a file) and it was a
1014        pattern that set a locale (followed by /Lsomething), pcretest crashed.
1015    
1016    19. Added additional timing features to pcretest. (1) The -tm option now times
1017        matching only, not compiling. (2) Both -t and -tm can be followed, as a
1018        separate command line item, by a number that specifies the number of
1019        repeats to use when timing. The default is 50000; this gives better
1020        precision, but takes uncomfortably long for very large patterns.
1021    
1022    20. Extended pcre_study() to be more clever in cases where a branch of a
1023        subpattern has no definite first character. For example, (a*|b*)[cd] would
1024        previously give no result from pcre_study(). Now it recognizes that the
1025        first character must be a, b, c, or d.
1026    
1027    21. There was an incorrect error "recursive call could loop indefinitely" if
1028        a subpattern (or the entire pattern) that was being tested for matching an
1029        empty string contained only one non-empty item after a nested subpattern.
1030        For example, the pattern (?>\x{100}*)\d(?R) provoked this error
1031        incorrectly, because the \d was being skipped in the check.
1032    
1033    22. The pcretest program now has a new pattern option /B and a command line
1034        option -b, which is equivalent to adding /B to every pattern. This causes
1035        it to show the compiled bytecode, without the additional information that
1036        -d shows. The effect of -d is now the same as -b with -i (and similarly, /D
1037        is the same as /B/I).
1038    
1039    23. A new optimization is now able automatically to treat some sequences such
1040        as a*b as a*+b. More specifically, if something simple (such as a character
1041        or a simple class like \d) has an unlimited quantifier, and is followed by
1042        something that cannot possibly match the quantified thing, the quantifier
1043        is automatically "possessified".
1044    
1045    24. A recursive reference to a subpattern whose number was greater than 39
1046        went wrong under certain circumstances in UTF-8 mode. This bug could also
1047        have affected the operation of pcre_study().
1048    
1049    25. Realized that a little bit of performance could be had by replacing
1050        (c & 0xc0) == 0xc0 with c >= 0xc0 when processing UTF-8 characters.
1051    
1052    26. Timing data from pcretest is now shown to 4 decimal places instead of 3.
1053    
1054    27. Possessive quantifiers such as a++ were previously implemented by turning
1055        them into atomic groups such as ($>a+). Now they have their own opcodes,
1056        which improves performance. This includes the automatically created ones
1057        from 23 above.
1058    
1059    28. A pattern such as (?=(\w+))\1: which simulates an atomic group using a
1060        lookahead was broken if it was not anchored. PCRE was mistakenly expecting
1061        the first matched character to be a colon. This applied both to named and
1062        numbered groups.
1063    
1064    29. The ucpinternal.h header file was missing its idempotency #ifdef.
1065    
1066    30. I was sent a "project" file called libpcre.a.dev which I understand makes
1067        building PCRE on Windows easier, so I have included it in the distribution.
1068    
1069    31. There is now a check in pcretest against a ridiculously large number being
1070        returned by pcre_exec() or pcre_dfa_exec(). If this happens in a /g or /G
1071        loop, the loop is abandoned.
1072    
1073    32. Forward references to subpatterns in conditions such as (?(2)...) where
1074        subpattern 2 is defined later cause pcre_compile() to search forwards in
1075        the pattern for the relevant set of parentheses. This search went wrong
1076        when there were unescaped parentheses in a character class, parentheses
1077        escaped with \Q...\E, or parentheses in a #-comment in /x mode.
1078    
1079    33. "Subroutine" calls and backreferences were previously restricted to
1080        referencing subpatterns earlier in the regex. This restriction has now
1081        been removed.
1082    
1083    34. Added a number of extra features that are going to be in Perl 5.10. On the
1084        whole, these are just syntactic alternatives for features that PCRE had
1085        previously implemented using the Python syntax or my own invention. The
1086        other formats are all retained for compatibility.
1087    
1088        (a) Named groups can now be defined as (?<name>...) or (?'name'...) as well
1089            as (?P<name>...). The new forms, as well as being in Perl 5.10, are
1090            also .NET compatible.
1091    
1092        (b) A recursion or subroutine call to a named group can now be defined as
1093            (?&name) as well as (?P>name).
1094    
1095        (c) A backreference to a named group can now be defined as \k<name> or
1096            \k'name' as well as (?P=name). The new forms, as well as being in Perl
1097            5.10, are also .NET compatible.
1098    
1099        (d) A conditional reference to a named group can now use the syntax
1100            (?(<name>) or (?('name') as well as (?(name).
1101    
1102        (e) A "conditional group" of the form (?(DEFINE)...) can be used to define
1103            groups (named and numbered) that are never evaluated inline, but can be
1104            called as "subroutines" from elsewhere. In effect, the DEFINE condition
1105            is always false. There may be only one alternative in such a group.
1106    
1107        (f) A test for recursion can be given as (?(R1).. or (?(R&name)... as well
1108            as the simple (?(R). The condition is true only if the most recent
1109            recursion is that of the given number or name. It does not search out
1110            through the entire recursion stack.
1111    
1112        (g) The escape \gN or \g{N} has been added, where N is a positive or
1113            negative number, specifying an absolute or relative reference.
1114    
1115    35. Tidied to get rid of some further signed/unsigned compiler warnings and
1116        some "unreachable code" warnings.
1117    
1118    36. Updated the Unicode property tables to Unicode version 5.0.0. Amongst other
1119        things, this adds five new scripts.
1120    
1121    37. Perl ignores orphaned \E escapes completely. PCRE now does the same.
1122        There were also incompatibilities regarding the handling of \Q..\E inside
1123        character classes, for example with patterns like [\Qa\E-\Qz\E] where the
1124        hyphen was adjacent to \Q or \E. I hope I've cleared all this up now.
1125    
1126    38. Like Perl, PCRE detects when an indefinitely repeated parenthesized group
1127        matches an empty string, and forcibly breaks the loop. There were bugs in
1128        this code in non-simple cases. For a pattern such as  ^(a()*)*  matched
1129        against  aaaa  the result was just "a" rather than "aaaa", for example. Two
1130        separate and independent bugs (that affected different cases) have been
1131        fixed.
1132    
1133    39. Refactored the code to abolish the use of different opcodes for small
1134        capturing bracket numbers. This is a tidy that I avoided doing when I
1135        removed the limit on the number of capturing brackets for 3.5 back in 2001.
1136        The new approach is not only tidier, it makes it possible to reduce the
1137        memory needed to fix the previous bug (38).
1138    
1139    40. Implemented PCRE_NEWLINE_ANY to recognize any of the Unicode newline
1140        sequences (http://unicode.org/unicode/reports/tr18/) as "newline" when
1141        processing dot, circumflex, or dollar metacharacters, or #-comments in /x
1142        mode.
1143    
1144    41. Add \R to match any Unicode newline sequence, as suggested in the Unicode
1145        report.
1146    
1147    42. Applied patch, originally from Ari Pollak, modified by Google, to allow
1148        copy construction and assignment in the C++ wrapper.
1149    
1150    43. Updated pcregrep to support "--newline=any". In the process, I fixed a
1151        couple of bugs that could have given wrong results in the "--newline=crlf"
1152        case.
1153    
1154    44. Added a number of casts and did some reorganization of signed/unsigned int
1155        variables following suggestions from Dair Grant. Also renamed the variable
1156        "this" as "item" because it is a C++ keyword.
1157    
1158    45. Arranged for dftables to add
1159    
1160          #include "pcre_internal.h"
1161    
1162        to pcre_chartables.c because without it, gcc 4.x may remove the array
1163        definition from the final binary if PCRE is built into a static library and
1164        dead code stripping is activated.
1165    
1166    46. For an unanchored pattern, if a match attempt fails at the start of a
1167        newline sequence, and the newline setting is CRLF or ANY, and the next two
1168        characters are CRLF, advance by two characters instead of one.
1169    
1170    
1171    Version 6.7 04-Jul-06
1172    ---------------------
1173    
1174     1. In order to handle tests when input lines are enormously long, pcretest has
1175        been re-factored so that it automatically extends its buffers when
1176        necessary. The code is crude, but this _is_ just a test program. The
1177        default size has been increased from 32K to 50K.
1178    
1179     2. The code in pcre_study() was using the value of the re argument before
1180        testing it for NULL. (Of course, in any sensible call of the function, it
1181        won't be NULL.)
1182    
1183     3. The memmove() emulation function in pcre_internal.h, which is used on
1184        systems that lack both memmove() and bcopy() - that is, hardly ever -
1185        was missing a "static" storage class specifier.
1186    
1187     4. When UTF-8 mode was not set, PCRE looped when compiling certain patterns
1188        containing an extended class (one that cannot be represented by a bitmap
1189        because it contains high-valued characters or Unicode property items, e.g.
1190        [\pZ]). Almost always one would set UTF-8 mode when processing such a
1191        pattern, but PCRE should not loop if you do not (it no longer does).
1192        [Detail: two cases were found: (a) a repeated subpattern containing an
1193        extended class; (b) a recursive reference to a subpattern that followed a
1194        previous extended class. It wasn't skipping over the extended class
1195        correctly when UTF-8 mode was not set.]
1196    
1197     5. A negated single-character class was not being recognized as fixed-length
1198        in lookbehind assertions such as (?<=[^f]), leading to an incorrect
1199        compile error "lookbehind assertion is not fixed length".
1200    
1201     6. The RunPerlTest auxiliary script was showing an unexpected difference
1202        between PCRE and Perl for UTF-8 tests. It turns out that it is hard to
1203        write a Perl script that can interpret lines of an input file either as
1204        byte characters or as UTF-8, which is what "perltest" was being required to
1205        do for the non-UTF-8 and UTF-8 tests, respectively. Essentially what you
1206        can't do is switch easily at run time between having the "use utf8;" pragma
1207        or not. In the end, I fudged it by using the RunPerlTest script to insert
1208        "use utf8;" explicitly for the UTF-8 tests.
1209    
1210     7. In multiline (/m) mode, PCRE was matching ^ after a terminating newline at
1211        the end of the subject string, contrary to the documentation and to what
1212        Perl does. This was true of both matching functions. Now it matches only at
1213        the start of the subject and immediately after *internal* newlines.
1214    
1215     8. A call of pcre_fullinfo() from pcretest to get the option bits was passing
1216        a pointer to an int instead of a pointer to an unsigned long int. This
1217        caused problems on 64-bit systems.
1218    
1219     9. Applied a patch from the folks at Google to pcrecpp.cc, to fix "another
1220        instance of the 'standard' template library not being so standard".
1221    
1222    10. There was no check on the number of named subpatterns nor the maximum
1223        length of a subpattern name. The product of these values is used to compute
1224        the size of the memory block for a compiled pattern. By supplying a very
1225        long subpattern name and a large number of named subpatterns, the size
1226        computation could be caused to overflow. This is now prevented by limiting
1227        the length of names to 32 characters, and the number of named subpatterns
1228        to 10,000.
1229    
1230    11. Subpatterns that are repeated with specific counts have to be replicated in
1231        the compiled pattern. The size of memory for this was computed from the
1232        length of the subpattern and the repeat count. The latter is limited to
1233        65535, but there was no limit on the former, meaning that integer overflow
1234        could in principle occur. The compiled length of a repeated subpattern is
1235        now limited to 30,000 bytes in order to prevent this.
1236    
1237    12. Added the optional facility to have named substrings with the same name.
1238    
1239    13. Added the ability to use a named substring as a condition, using the
1240        Python syntax: (?(name)yes|no). This overloads (?(R)... and names that
1241        are numbers (not recommended). Forward references are permitted.
1242    
1243    14. Added forward references in named backreferences (if you see what I mean).
1244    
1245    15. In UTF-8 mode, with the PCRE_DOTALL option set, a quantified dot in the
1246        pattern could run off the end of the subject. For example, the pattern
1247        "(?s)(.{1,5})"8 did this with the subject "ab".
1248    
1249    16. If PCRE_DOTALL or PCRE_MULTILINE were set, pcre_dfa_exec() behaved as if
1250        PCRE_CASELESS was set when matching characters that were quantified with ?
1251        or *.
1252    
1253    17. A character class other than a single negated character that had a minimum
1254        but no maximum quantifier - for example [ab]{6,} - was not handled
1255        correctly by pce_dfa_exec(). It would match only one character.
1256    
1257    18. A valid (though odd) pattern that looked like a POSIX character
1258        class but used an invalid character after [ (for example [[,abc,]]) caused
1259        pcre_compile() to give the error "Failed: internal error: code overflow" or
1260        in some cases to crash with a glibc free() error. This could even happen if
1261        the pattern terminated after [[ but there just happened to be a sequence of
1262        letters, a binary zero, and a closing ] in the memory that followed.
1263    
1264    19. Perl's treatment of octal escapes in the range \400 to \777 has changed
1265        over the years. Originally (before any Unicode support), just the bottom 8
1266        bits were taken. Thus, for example, \500 really meant \100. Nowadays the
1267        output from "man perlunicode" includes this:
1268    
1269          The regular expression compiler produces polymorphic opcodes.  That
1270          is, the pattern adapts to the data and automatically switches to
1271          the Unicode character scheme when presented with Unicode data--or
1272          instead uses a traditional byte scheme when presented with byte
1273          data.
1274    
1275        Sadly, a wide octal escape does not cause a switch, and in a string with
1276        no other multibyte characters, these octal escapes are treated as before.
1277        Thus, in Perl, the pattern  /\500/ actually matches \100 but the pattern
1278        /\500|\x{1ff}/ matches \500 or \777 because the whole thing is treated as a
1279        Unicode string.
1280    
1281        I have not perpetrated such confusion in PCRE. Up till now, it took just
1282        the bottom 8 bits, as in old Perl. I have now made octal escapes with
1283        values greater than \377 illegal in non-UTF-8 mode. In UTF-8 mode they
1284        translate to the appropriate multibyte character.
1285    
1286    29. Applied some refactoring to reduce the number of warnings from Microsoft
1287        and Borland compilers. This has included removing the fudge introduced
1288        seven years ago for the OS/2 compiler (see 2.02/2 below) because it caused
1289        a warning about an unused variable.
1290    
1291    21. PCRE has not included VT (character 0x0b) in the set of whitespace
1292        characters since release 4.0, because Perl (from release 5.004) does not.
1293        [Or at least, is documented not to: some releases seem to be in conflict
1294        with the documentation.] However, when a pattern was studied with
1295        pcre_study() and all its branches started with \s, PCRE still included VT
1296        as a possible starting character. Of course, this did no harm; it just
1297        caused an unnecessary match attempt.
1298    
1299    22. Removed a now-redundant internal flag bit that recorded the fact that case
1300        dependency changed within the pattern. This was once needed for "required
1301        byte" processing, but is no longer used. This recovers a now-scarce options
1302        bit. Also moved the least significant internal flag bit to the most-
1303        significant bit of the word, which was not previously used (hangover from
1304        the days when it was an int rather than a uint) to free up another bit for
1305        the future.
1306    
1307    23. Added support for CRLF line endings as well as CR and LF. As well as the
1308        default being selectable at build time, it can now be changed at runtime
1309        via the PCRE_NEWLINE_xxx flags. There are now options for pcregrep to
1310        specify that it is scanning data with non-default line endings.
1311    
1312    24. Changed the definition of CXXLINK to make it agree with the definition of
1313        LINK in the Makefile, by replacing LDFLAGS to CXXFLAGS.
1314    
1315    25. Applied Ian Taylor's patches to avoid using another stack frame for tail
1316        recursions. This makes a big different to stack usage for some patterns.
1317    
1318    26. If a subpattern containing a named recursion or subroutine reference such
1319        as (?P>B) was quantified, for example (xxx(?P>B)){3}, the calculation of
1320        the space required for the compiled pattern went wrong and gave too small a
1321        value. Depending on the environment, this could lead to "Failed: internal
1322        error: code overflow at offset 49" or "glibc detected double free or
1323        corruption" errors.
1324    
1325    27. Applied patches from Google (a) to support the new newline modes and (b) to
1326        advance over multibyte UTF-8 characters in GlobalReplace.
1327    
1328    28. Change free() to pcre_free() in pcredemo.c. Apparently this makes a
1329        difference for some implementation of PCRE in some Windows version.
1330    
1331    29. Added some extra testing facilities to pcretest:
1332    
1333        \q<number>   in a data line sets the "match limit" value
1334        \Q<number>   in a data line sets the "match recursion limt" value
1335        -S <number>  sets the stack size, where <number> is in megabytes
1336    
1337        The -S option isn't available for Windows.
1338    
1339    
1340    Version 6.6 06-Feb-06
1341    ---------------------
1342    
1343     1. Change 16(a) for 6.5 broke things, because PCRE_DATA_SCOPE was not defined
1344        in pcreposix.h. I have copied the definition from pcre.h.
1345    
1346     2. Change 25 for 6.5 broke compilation in a build directory out-of-tree
1347        because pcre.h is no longer a built file.
1348    
1349     3. Added Jeff Friedl's additional debugging patches to pcregrep. These are
1350        not normally included in the compiled code.
1351    
1352    
1353    Version 6.5 01-Feb-06
1354    ---------------------
1355    
1356     1. When using the partial match feature with pcre_dfa_exec(), it was not
1357        anchoring the second and subsequent partial matches at the new starting
1358        point. This could lead to incorrect results. For example, with the pattern
1359        /1234/, partially matching against "123" and then "a4" gave a match.
1360    
1361     2. Changes to pcregrep:
1362    
1363        (a) All non-match returns from pcre_exec() were being treated as failures
1364            to match the line. Now, unless the error is PCRE_ERROR_NOMATCH, an
1365            error message is output. Some extra information is given for the
1366            PCRE_ERROR_MATCHLIMIT and PCRE_ERROR_RECURSIONLIMIT errors, which are
1367            probably the only errors that are likely to be caused by users (by
1368            specifying a regex that has nested indefinite repeats, for instance).
1369            If there are more than 20 of these errors, pcregrep is abandoned.
1370    
1371        (b) A binary zero was treated as data while matching, but terminated the
1372            output line if it was written out. This has been fixed: binary zeroes
1373            are now no different to any other data bytes.
1374    
1375        (c) Whichever of the LC_ALL or LC_CTYPE environment variables is set is
1376            used to set a locale for matching. The --locale=xxxx long option has
1377            been added (no short equivalent) to specify a locale explicitly on the
1378            pcregrep command, overriding the environment variables.
1379    
1380        (d) When -B was used with -n, some line numbers in the output were one less
1381            than they should have been.
1382    
1383        (e) Added the -o (--only-matching) option.
1384    
1385        (f) If -A or -C was used with -c (count only), some lines of context were
1386            accidentally printed for the final match.
1387    
1388        (g) Added the -H (--with-filename) option.
1389    
1390        (h) The combination of options -rh failed to suppress file names for files
1391            that were found from directory arguments.
1392    
1393        (i) Added the -D (--devices) and -d (--directories) options.
1394    
1395        (j) Added the -F (--fixed-strings) option.
1396    
1397        (k) Allow "-" to be used as a file name for -f as well as for a data file.
1398    
1399        (l) Added the --colo(u)r option.
1400    
1401        (m) Added Jeffrey Friedl's -S testing option, but within #ifdefs so that it
1402            is not present by default.
1403    
1404     3. A nasty bug was discovered in the handling of recursive patterns, that is,
1405        items such as (?R) or (?1), when the recursion could match a number of
1406        alternatives. If it matched one of the alternatives, but subsequently,
1407        outside the recursion, there was a failure, the code tried to back up into
1408        the recursion. However, because of the way PCRE is implemented, this is not
1409        possible, and the result was an incorrect result from the match.
1410    
1411        In order to prevent this happening, the specification of recursion has
1412        been changed so that all such subpatterns are automatically treated as
1413        atomic groups. Thus, for example, (?R) is treated as if it were (?>(?R)).
1414    
1415     4. I had overlooked the fact that, in some locales, there are characters for
1416        which isalpha() is true but neither isupper() nor islower() are true. In
1417        the fr_FR locale, for instance, the \xAA and \xBA characters (ordmasculine
1418        and ordfeminine) are like this. This affected the treatment of \w and \W
1419        when they appeared in character classes, but not when they appeared outside
1420        a character class. The bit map for "word" characters is now created
1421        separately from the results of isalnum() instead of just taking it from the
1422        upper, lower, and digit maps. (Plus the underscore character, of course.)
1423    
1424     5. The above bug also affected the handling of POSIX character classes such as
1425        [[:alpha:]] and [[:alnum:]]. These do not have their own bit maps in PCRE's
1426        permanent tables. Instead, the bit maps for such a class were previously
1427        created as the appropriate unions of the upper, lower, and digit bitmaps.
1428        Now they are created by subtraction from the [[:word:]] class, which has
1429        its own bitmap.
1430    
1431     6. The [[:blank:]] character class matches horizontal, but not vertical space.
1432        It is created by subtracting the vertical space characters (\x09, \x0a,
1433        \x0b, \x0c) from the [[:space:]] bitmap. Previously, however, the
1434        subtraction was done in the overall bitmap for a character class, meaning
1435        that a class such as [\x0c[:blank:]] was incorrect because \x0c would not
1436        be recognized. This bug has been fixed.
1437    
1438     7. Patches from the folks at Google:
1439    
1440          (a) pcrecpp.cc: "to handle a corner case that may or may not happen in
1441          real life, but is still worth protecting against".
1442    
1443          (b) pcrecpp.cc: "corrects a bug when negative radixes are used with
1444          regular expressions".
1445    
1446          (c) pcre_scanner.cc: avoid use of std::count() because not all systems
1447          have it.
1448    
1449          (d) Split off pcrecpparg.h from pcrecpp.h and had the former built by
1450          "configure" and the latter not, in order to fix a problem somebody had
1451          with compiling the Arg class on HP-UX.
1452    
1453          (e) Improve the error-handling of the C++ wrapper a little bit.
1454    
1455          (f) New tests for checking recursion limiting.
1456    
1457     8. The pcre_memmove() function, which is used only if the environment does not
1458        have a standard memmove() function (and is therefore rarely compiled),
1459        contained two bugs: (a) use of int instead of size_t, and (b) it was not
1460        returning a result (though PCRE never actually uses the result).
1461    
1462     9. In the POSIX regexec() interface, if nmatch is specified as a ridiculously
1463        large number - greater than INT_MAX/(3*sizeof(int)) - REG_ESPACE is
1464        returned instead of calling malloc() with an overflowing number that would
1465        most likely cause subsequent chaos.
1466    
1467    10. The debugging option of pcretest was not showing the NO_AUTO_CAPTURE flag.
1468    
1469    11. The POSIX flag REG_NOSUB is now supported. When a pattern that was compiled
1470        with this option is matched, the nmatch and pmatch options of regexec() are
1471        ignored.
1472    
1473    12. Added REG_UTF8 to the POSIX interface. This is not defined by POSIX, but is
1474        provided in case anyone wants to the the POSIX interface with UTF-8
1475        strings.
1476    
1477    13. Added CXXLDFLAGS to the Makefile parameters to provide settings only on the
1478        C++ linking (needed for some HP-UX environments).
1479    
1480    14. Avoid compiler warnings in get_ucpname() when compiled without UCP support
1481        (unused parameter) and in the pcre_printint() function (omitted "default"
1482        switch label when the default is to do nothing).
1483    
1484    15. Added some code to make it possible, when PCRE is compiled as a C++
1485        library, to replace subject pointers for pcre_exec() with a smart pointer
1486        class, thus making it possible to process discontinuous strings.
1487    
1488    16. The two macros PCRE_EXPORT and PCRE_DATA_SCOPE are confusing, and perform
1489        much the same function. They were added by different people who were trying
1490        to make PCRE easy to compile on non-Unix systems. It has been suggested
1491        that PCRE_EXPORT be abolished now that there is more automatic apparatus
1492        for compiling on Windows systems. I have therefore replaced it with
1493        PCRE_DATA_SCOPE. This is set automatically for Windows; if not set it
1494        defaults to "extern" for C or "extern C" for C++, which works fine on
1495        Unix-like systems. It is now possible to override the value of PCRE_DATA_
1496        SCOPE with something explicit in config.h. In addition:
1497    
1498        (a) pcreposix.h still had just "extern" instead of either of these macros;
1499            I have replaced it with PCRE_DATA_SCOPE.
1500    
1501        (b) Functions such as _pcre_xclass(), which are internal to the library,
1502            but external in the C sense, all had PCRE_EXPORT in their definitions.
1503            This is apparently wrong for the Windows case, so I have removed it.
1504            (It makes no difference on Unix-like systems.)
1505    
1506    17. Added a new limit, MATCH_LIMIT_RECURSION, which limits the depth of nesting
1507        of recursive calls to match(). This is different to MATCH_LIMIT because
1508        that limits the total number of calls to match(), not all of which increase
1509        the depth of recursion. Limiting the recursion depth limits the amount of
1510        stack (or heap if NO_RECURSE is set) that is used. The default can be set
1511        when PCRE is compiled, and changed at run time. A patch from Google adds
1512        this functionality to the C++ interface.
1513    
1514    18. Changes to the handling of Unicode character properties:
1515    
1516        (a) Updated the table to Unicode 4.1.0.
1517    
1518        (b) Recognize characters that are not in the table as "Cn" (undefined).
1519    
1520        (c) I revised the way the table is implemented to a much improved format
1521            which includes recognition of ranges. It now supports the ranges that
1522            are defined in UnicodeData.txt, and it also amalgamates other
1523            characters into ranges. This has reduced the number of entries in the
1524            table from around 16,000 to around 3,000, thus reducing its size
1525            considerably. I realized I did not need to use a tree structure after
1526            all - a binary chop search is just as efficient. Having reduced the
1527            number of entries, I extended their size from 6 bytes to 8 bytes to
1528            allow for more data.
1529    
1530        (d) Added support for Unicode script names via properties such as \p{Han}.
1531    
1532    19. In UTF-8 mode, a backslash followed by a non-Ascii character was not
1533        matching that character.
1534    
1535    20. When matching a repeated Unicode property with a minimum greater than zero,
1536        (for example \pL{2,}), PCRE could look past the end of the subject if it
1537        reached it while seeking the minimum number of characters. This could
1538        happen only if some of the characters were more than one byte long, because
1539        there is a check for at least the minimum number of bytes.
1540    
1541    21. Refactored the implementation of \p and \P so as to be more general, to
1542        allow for more different types of property in future. This has changed the
1543        compiled form incompatibly. Anybody with saved compiled patterns that use
1544        \p or \P will have to recompile them.
1545    
1546    22. Added "Any" and "L&" to the supported property types.
1547    
1548    23. Recognize \x{...} as a code point specifier, even when not in UTF-8 mode,
1549        but give a compile time error if the value is greater than 0xff.
1550    
1551    24. The man pages for pcrepartial, pcreprecompile, and pcre_compile2 were
1552        accidentally not being installed or uninstalled.
1553    
1554    25. The pcre.h file was built from pcre.h.in, but the only changes that were
1555        made were to insert the current release number. This seemed silly, because
1556        it made things harder for people building PCRE on systems that don't run
1557        "configure". I have turned pcre.h into a distributed file, no longer built
1558        by "configure", with the version identification directly included. There is
1559        no longer a pcre.h.in file.
1560    
1561        However, this change necessitated a change to the pcre-config script as
1562        well. It is built from pcre-config.in, and one of the substitutions was the
1563        release number. I have updated configure.ac so that ./configure now finds
1564        the release number by grepping pcre.h.
1565    
1566    26. Added the ability to run the tests under valgrind.
1567    
1568    
1569    Version 6.4 05-Sep-05
1570    ---------------------
1571    
1572     1. Change 6.0/10/(l) to pcregrep introduced a bug that caused separator lines
1573        "--" to be printed when multiple files were scanned, even when none of the
1574        -A, -B, or -C options were used. This is not compatible with Gnu grep, so I
1575        consider it to be a bug, and have restored the previous behaviour.
1576    
1577     2. A couple of code tidies to get rid of compiler warnings.
1578    
1579     3. The pcretest program used to cheat by referring to symbols in the library
1580        whose names begin with _pcre_. These are internal symbols that are not
1581        really supposed to be visible externally, and in some environments it is
1582        possible to suppress them. The cheating is now confined to including
1583        certain files from the library's source, which is a bit cleaner.
1584    
1585     4. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
1586        file's purpose clearer.
1587    
1588     5. Reorganized pcre_ucp_findchar().
1589    
1590    
1591    Version 6.3 15-Aug-05
1592    ---------------------
1593    
1594     1. The file libpcre.pc.in did not have general read permission in the tarball.
1595    
1596     2. There were some problems when building without C++ support:
1597    
1598        (a) If C++ support was not built, "make install" and "make test" still
1599            tried to test it.
1600    
1601        (b) There were problems when the value of CXX was explicitly set. Some
1602            changes have been made to try to fix these, and ...
1603    
1604        (c) --disable-cpp can now be used to explicitly disable C++ support.
1605    
1606        (d) The use of @CPP_OBJ@ directly caused a blank line preceded by a
1607            backslash in a target when C++ was disabled. This confuses some
1608            versions of "make", apparently. Using an intermediate variable solves
1609            this. (Same for CPP_LOBJ.)
1610    
1611     3. $(LINK_FOR_BUILD) now includes $(CFLAGS_FOR_BUILD) and $(LINK)
1612        (non-Windows) now includes $(CFLAGS) because these flags are sometimes
1613        necessary on certain architectures.
1614    
1615     4. Added a setting of -export-symbols-regex to the link command to remove
1616        those symbols that are exported in the C sense, but actually are local
1617        within the library, and not documented. Their names all begin with
1618        "_pcre_". This is not a perfect job, because (a) we have to except some
1619        symbols that pcretest ("illegally") uses, and (b) the facility isn't always
1620        available (and never for static libraries). I have made a note to try to
1621        find a way round (a) in the future.
1622    
1623    
1624    Version 6.2 01-Aug-05
1625    ---------------------
1626    
1627     1. There was no test for integer overflow of quantifier values. A construction
1628        such as {1111111111111111} would give undefined results. What is worse, if
1629        a minimum quantifier for a parenthesized subpattern overflowed and became
1630        negative, the calculation of the memory size went wrong. This could have
1631        led to memory overwriting.
1632    
1633     2. Building PCRE using VPATH was broken. Hopefully it is now fixed.
1634    
1635     3. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
1636        operating environments where this matters.
1637    
1638     4. Applied Giuseppe Maxia's patch to add additional features for controlling
1639        PCRE options from within the C++ wrapper.
1640    
1641     5. Named capturing subpatterns were not being correctly counted when a pattern
1642        was compiled. This caused two problems: (a) If there were more than 100
1643        such subpatterns, the calculation of the memory needed for the whole
1644        compiled pattern went wrong, leading to an overflow error. (b) Numerical
1645        back references of the form \12, where the number was greater than 9, were
1646        not recognized as back references, even though there were sufficient
1647        previous subpatterns.
1648    
1649     6. Two minor patches to pcrecpp.cc in order to allow it to compile on older
1650        versions of gcc, e.g. 2.95.4.
1651    
1652    
1653  Version 6.1 21-Jun-05  Version 6.1 21-Jun-05
1654  ---------------------  ---------------------
1655    

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