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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 8.00 ??-???-??
5    ----------------------
6    
7    1.  The table for translating pcre_compile() error codes into POSIX error codes
8        was out-of-date, and there was no check on the pcre_compile() error code
9        being within the table. This could lead to an OK return being given in
10        error.
11    
12    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
13        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
14        in a Windows environment.
15    
16    
17    Version 7.9 11-Apr-09
18    ---------------------
19    
20    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
21        (pcretest), all targets were linked against these libraries. This included
22        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
23        libraries. This caused unwanted dependencies to be created. This problem
24        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
25        pcretest is linked with readline.
26    
27    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
28        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
29        moved outside it again, because FALSE and TRUE are already defined in AIX,
30        but BOOL is not.
31    
32    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
33        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
34    
35    4.  The pcregrep documentation said spaces were inserted as well as colons (or
36        hyphens) following file names and line numbers when outputting matching
37        lines. This is not true; no spaces are inserted. I have also clarified the
38        wording for the --colour (or --color) option.
39    
40    5.  In pcregrep, when --colour was used with -o, the list of matching strings
41        was not coloured; this is different to GNU grep, so I have changed it to be
42        the same.
43    
44    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
45        each matching line was coloured. Now it goes on to look for further matches
46        of any of the test patterns, which is the same behaviour as GNU grep.
47    
48    7.  A pattern that could match an empty string could cause pcregrep to loop; it
49        doesn't make sense to accept an empty string match in pcregrep, so I have
50        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
51        seems to be how GNU grep behaves.
52    
53    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
54        start or after a newline", because the conditional assertion was not being
55        correctly handled. The rule now is that both the assertion and what follows
56        in the first alternative must satisfy the test.
57    
58    9.  If auto-callout was enabled in a pattern with a conditional group whose
59        condition was an assertion, PCRE could crash during matching, both with
60        pcre_exec() and pcre_dfa_exec().
61    
62    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
63        used for matching.
64    
65    11. Unicode property support in character classes was not working for
66        characters (bytes) greater than 127 when not in UTF-8 mode.
67    
68    12. Added the -M command line option to pcretest.
69    
70    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
71    
72    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
73    
74    16. Added comments and documentation about mis-use of no_arg in the C++
75        wrapper.
76    
77    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
78        from Martin Jerabek that uses macro names for all relevant character and
79        string constants.
80    
81    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
82        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
83        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
84        these, but not everybody uses configure.
85    
86    19. A conditional group that had only one branch was not being correctly
87        recognized as an item that could match an empty string. This meant that an
88        enclosing group might also not be so recognized, causing infinite looping
89        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
90        with the subject "ab", where knowledge that the repeated group can match
91        nothing is needed in order to break the loop.
92    
93    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
94        exec(), but without supplying a callout function, matching went wrong.
95    
96    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
97        leak if the size of the offset vector was greater than 30. When the vector
98        is smaller, the saved offsets during recursion go onto a local stack
99        vector, but for larger vectors malloc() is used. It was failing to free
100        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
101        error, in fact).
102    
103    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
104        heapframe that is used only when UTF-8 support is enabled. This caused no
105        problem, but was untidy.
106    
107    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
108        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
109        included within another project.
110    
111    24. Steven Van Ingelgem's patches to add more options to the CMake support,
112        slightly modified by me:
113    
114          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
115              not building pcregrep.
116    
117          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
118              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
119    
120    25. Forward references, both numeric and by name, in patterns that made use of
121        duplicate group numbers, could behave incorrectly or give incorrect errors,
122        because when scanning forward to find the reference group, PCRE was not
123        taking into account the duplicate group numbers. A pattern such as
124        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
125    
126    26. Changed a few more instances of "const unsigned char *" to USPTR, making
127        the feature of a custom pointer more persuasive (as requested by a user).
128    
129    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
130        pcretest.c, inside #ifndefs, because it seems they are sometimes already
131        pre-defined.
132    
133    28. Added support for (*UTF8) at the start of a pattern.
134    
135    29. Arrange for flags added by the "release type" setting in CMake to be shown
136        in the configuration summary.
137    
138    
139    Version 7.8 05-Sep-08
140    ---------------------
141    
142    1.  Replaced UCP searching code with optimized version as implemented for Ad
143        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
144        stage table and inline lookup instead of a function, giving speed ups of 2
145        to 5 times on some simple patterns that I tested. Permission was given to
146        distribute the MultiStage2.py script that generates the tables (it's not in
147        the tarball, but is in the Subversion repository).
148    
149    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
150        scripts.
151    
152    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
153        a group with a zero qualifier. The result of the study could be incorrect,
154        or the function might crash, depending on the pattern.
155    
156    4.  Caseless matching was not working for non-ASCII characters in back
157        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
158        It now works when Unicode Property Support is available.
159    
160    5.  In pcretest, an escape such as \x{de} in the data was always generating
161        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
162        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
163        truncation.
164    
165    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
166    
167    7.  Added two (int) casts to pcregrep when printing the difference of two
168        pointers, in case they are 64-bit values.
169    
170    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
171        test 2 if it fails.
172    
173    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
174        and a #define of that name to empty if it is not externally set. This is to
175        allow users of MSVC to set it if necessary.
176    
177    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
178        the convenience functions in the pcre_get.c source file.
179    
180    11. An option change at the start of a pattern that had top-level alternatives
181        could cause overwriting and/or a crash. This command provoked a crash in
182        some environments:
183    
184          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
185    
186        This potential security problem was recorded as CVE-2008-2371.
187    
188    12. For a pattern where the match had to start at the beginning or immediately
189        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
190        pcre_dfa_exec() could read past the end of the passed subject if there was
191        no match. To help with detecting such bugs (e.g. with valgrind), I modified
192        pcretest so that it places the subject at the end of its malloc-ed buffer.
193    
194    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
195        exec() might read past the end of the data buffer in UTF-8 mode.
196    
197    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
198        the data contained the byte 0x85 as part of a UTF-8 character within its
199        first line. This applied both to normal and DFA matching.
200    
201    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
202        /^[^d]*?$/8 failed to match "abc".
203    
204    16. Added a missing copyright notice to pcrecpp_internal.h.
205    
206    17. Make it more clear in the documentation that values returned from
207        pcre_exec() in ovector are byte offsets, not character counts.
208    
209    18. Tidied a few places to stop certain compilers from issuing warnings.
210    
211    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
212        supplied by Stefan Weber. I made a further small update for 7.8 because
213        there is a change of source arrangements: the pcre_searchfuncs.c module is
214        replaced by pcre_ucd.c.
215    
216    
217    Version 7.7 07-May-08
218    ---------------------
219    
220    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
221        a string to a long long, pretend we don't even have a long long." This is
222        done by checking for the strtoq, strtoll, and _strtoi64 functions.
223    
224    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
225        pre-7.6 versions, which defined a global no_arg variable instead of putting
226        it in the RE class. (See also #8 below.)
227    
228    3.  Remove a line of dead code, identified by coverity and reported by Nuno
229        Lopes.
230    
231    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
232    
233        (1) The include/exclude patterns were being applied to the whole pathnames
234            of files, instead of just to the final components.
235    
236        (2) If there was more than one level of directory, the subdirectories were
237            skipped unless they satisfied the include/exclude conditions. This is
238            inconsistent with GNU grep (and could even be seen as contrary to the
239            pcregrep specification - which I improved to make it absolutely clear).
240            The action now is always to scan all levels of directory, and just
241            apply the include/exclude patterns to regular files.
242    
243    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
244        --exclude_dir in the tests to avoid scanning .svn directories.
245    
246    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
247        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
248        doesn't support NULs in patterns.
249    
250    7.  Added some missing "const"s to declarations of static tables in
251        pcre_compile.c and pcre_dfa_exec.c.
252    
253    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
254        caused by fix #2  above. (Subsequently also a second patch to fix the
255        first patch. And a third patch - this was a messy problem.)
256    
257    9.  Applied Craig's patch to remove the use of push_back().
258    
259    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
260        matching function regexec().
261    
262    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
263        which, however, unlike Perl's \g{...}, are subroutine calls, not back
264        references. PCRE supports relative numbers with this syntax (I don't think
265        Oniguruma does).
266    
267    12. Previously, a group with a zero repeat such as (...){0} was completely
268        omitted from the compiled regex. However, this means that if the group
269        was called as a subroutine from elsewhere in the pattern, things went wrong
270        (an internal error was given). Such groups are now left in the compiled
271        pattern, with a new opcode that causes them to be skipped at execution
272        time.
273    
274    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
275        to the way PCRE behaves:
276    
277        (a) A lone ] character is dis-allowed (Perl treats it as data).
278    
279        (b) A back reference to an unmatched subpattern matches an empty string
280            (Perl fails the current match path).
281    
282        (c) A data ] in a character class must be notated as \] because if the
283            first data character in a class is ], it defines an empty class. (In
284            Perl it is not possible to have an empty class.) The empty class []
285            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
286            The negative empty class [^] matches any one character, independently
287            of the DOTALL setting.
288    
289    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
290        non-existent subpattern following a character class starting with ']' and
291        containing () gave an internal compiling error instead of "reference to
292        non-existent subpattern". Fortunately, when the pattern did exist, the
293        compiled code was correct. (When scanning forwards to check for the
294        existencd of the subpattern, it was treating the data ']' as terminating
295        the class, so got the count wrong. When actually compiling, the reference
296        was subsequently set up correctly.)
297    
298    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
299        it was being rejected as not supported by pcre_dfa_exec(), even though
300        other assertions are supported. I have made pcre_dfa_exec() support
301        (*FAIL).
302    
303    16. The implementation of 13c above involved the invention of a new opcode,
304        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
305        cannot be changed at match time, I realized I could make a small
306        improvement to matching performance by compiling OP_ALLANY instead of
307        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
308        on the OP_ANY path.
309    
310    17. Compiling pcretest on Windows with readline support failed without the
311        following two fixes: (1) Make the unistd.h include conditional on
312        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
313    
314    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
315        ncurses library to be included for pcretest when ReadLine support is
316        requested, but also to allow for it to be overridden. This patch came from
317        Daniel Bergström.
318    
319    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
320        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
321        any errors with the current Unicode tables. Thanks to Peter Kankowski for
322        spotting this.
323    
324    
325    Version 7.6 28-Jan-08
326    ---------------------
327    
328    1.  A character class containing a very large number of characters with
329        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
330        overflow.
331    
332    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
333        HAVE_LONG_LONG is not defined.
334    
335    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
336        bring them up to date and include new features. This patch includes:
337    
338        - Fixed PH's badly added libz and libbz2 support.
339        - Fixed a problem with static linking.
340        - Added pcredemo. [But later removed - see 7 below.]
341        - Fixed dftables problem and added an option.
342        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
343            HAVE_LONG_LONG.
344        - Added readline support for pcretest.
345        - Added an listing of the option settings after cmake has run.
346    
347    4.  A user submitted a patch to Makefile that makes it easy to create
348        "pcre.dll" under mingw when using Configure/Make. I added stuff to
349        Makefile.am that cause it to include this special target, without
350        affecting anything else. Note that the same mingw target plus all
351        the other distribution libraries and programs are now supported
352        when configuring with CMake (see 6 below) instead of with
353        Configure/Make.
354    
355    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
356        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
357        exported in the Windows port". It has not yet been confirmed that the patch
358        solves the problem, but it does no harm.
359    
360    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
361        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
362        with CMake, and also correct the comment about stack recursion.
363    
364    7.  Remove the automatic building of pcredemo from the ./configure system and
365        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
366        of a program that users should build themselves after PCRE is installed, so
367        building it automatically is not really right. What is more, it gave
368        trouble in some build environments.
369    
370    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
371    
372    
373    Version 7.5 10-Jan-08
374    ---------------------
375    
376    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
377        values in parens when parsing an RE using the C++ wrapper."
378    
379    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
380        Characters greater than 255 were excluded from the class instead of being
381        included.
382    
383    3.  The same bug as (2) above applied to negated POSIX classes such as
384        [:^space:].
385    
386    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
387        defined or documented. It seems to have been a typo for PCRE_STATIC, so
388        I have changed it.
389    
390    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
391        first named subpattern) and a construct such as (?&a) would reference the
392        first named subpattern whose name started with "a" (in other words, the
393        length check was missing). Both these problems are fixed. "Subpattern name
394        expected" is now given for (?&) (a zero-length name), and this patch also
395        makes it give the same error for \k'' (previously it complained that that
396        was a reference to a non-existent subpattern).
397    
398    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
399        this is right because (?- can be followed by option settings as well as by
400        digits. I have, however, made the messages clearer.
401    
402    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
403        than the number used in the conditional) now cause a compile-time error.
404        This is actually not compatible with Perl, which accepts such patterns, but
405        treats the conditional as always being FALSE (as PCRE used to), but it
406        seems to me that giving a diagnostic is better.
407    
408    8.  Change "alphameric" to the more common word "alphanumeric" in comments
409        and messages.
410    
411    9.  Fix two occurrences of "backslash" in comments that should have been
412        "backspace".
413    
414    10. Remove two redundant lines of code that can never be obeyed (their function
415        was moved elsewhere).
416    
417    11. The program that makes PCRE's Unicode character property table had a bug
418        which caused it to generate incorrect table entries for sequences of
419        characters that have the same character type, but are in different scripts.
420        It amalgamated them into a single range, with the script of the first of
421        them. In other words, some characters were in the wrong script. There were
422        thirteen such cases, affecting characters in the following ranges:
423    
424          U+002b0 - U+002c1
425          U+0060c - U+0060d
426          U+0061e - U+00612
427          U+0064b - U+0065e
428          U+0074d - U+0076d
429          U+01800 - U+01805
430          U+01d00 - U+01d77
431          U+01d9b - U+01dbf
432          U+0200b - U+0200f
433          U+030fc - U+030fe
434          U+03260 - U+0327f
435          U+0fb46 - U+0fbb1
436          U+10450 - U+1049d
437    
438    12. The -o option (show only the matching part of a line) for pcregrep was not
439        compatible with GNU grep in that, if there was more than one match in a
440        line, it showed only the first of them. It now behaves in the same way as
441        GNU grep.
442    
443    13. If the -o and -v options were combined for pcregrep, it printed a blank
444        line for every non-matching line. GNU grep prints nothing, and pcregrep now
445        does the same. The return code can be used to tell if there were any
446        non-matching lines.
447    
448    14. Added --file-offsets and --line-offsets to pcregrep.
449    
450    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
451        infinitely looping recursion. The bug was that positive lookaheads were not
452        being skipped when checking for a possible empty match (negative lookaheads
453        and both kinds of lookbehind were skipped).
454    
455    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
456        inclusion of <windows.h> to before rather than after the definition of
457        INVALID_FILE_ATTRIBUTES (patch from David Byron).
458    
459    17. Specifying a possessive quantifier with a specific limit for a Unicode
460        character property caused pcre_compile() to compile bad code, which led at
461        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
462        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
463        caused the error; without that there was no problem.
464    
465    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
466    
467    19. Added --enable-pcretest-libreadline.
468    
469    20. In pcrecpp.cc, the variable 'count' was incremented twice in
470        RE::GlobalReplace(). As a result, the number of replacements returned was
471        double what it should be. I removed one of the increments, but Craig sent a
472        later patch that removed the other one (the right fix) and added unit tests
473        that check the return values (which was not done before).
474    
475    21. Several CMake things:
476    
477        (1) Arranged that, when cmake is used on Unix, the libraries end up with
478            the names libpcre and libpcreposix, not just pcre and pcreposix.
479    
480        (2) The above change means that pcretest and pcregrep are now correctly
481            linked with the newly-built libraries, not previously installed ones.
482    
483        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
484    
485    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
486        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
487        UTF-8 newline character). The key issue is that the pattern starts .*;
488        this means that the match must be either at the beginning, or after a
489        newline. The bug was in the code for advancing after a failed match and
490        checking that the new position followed a newline. It was not taking
491        account of UTF-8 characters correctly.
492    
493    23. PCRE was behaving differently from Perl in the way it recognized POSIX
494        character classes. PCRE was not treating the sequence [:...:] as a
495        character class unless the ... were all letters. Perl, however, seems to
496        allow any characters between [: and :], though of course it rejects as
497        unknown any "names" that contain non-letters, because all the known class
498        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
499        for example, whereas PCRE did not - it did not recognize a POSIX character
500        class. This seemed a bit dangerous, so the code has been changed to be
501        closer to Perl. The behaviour is not identical to Perl, because PCRE will
502        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
503        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
504        Perl does, and where it didn't before.
505    
506    24. Rewrite so as to remove the single use of %n from pcregrep because in some
507        Windows environments %n is disabled by default.
508    
509    
510    Version 7.4 21-Sep-07
511    ---------------------
512    
513    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
514        means that a class such as [\s] counted as "explicit reference to CR or
515        LF". That isn't really right - the whole point of the change was to try to
516        help when there was an actual mention of one of the two characters. So now
517        the change happens only if \r or \n (or a literal CR or LF) character is
518        encountered.
519    
520    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
521        of both had grown to the point where there were only 3 bits left.
522        Fortunately, there was spare space in the data structure, and so I have
523        moved the internal flags into a new 16-bit field to free up more option
524        bits.
525    
526    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
527        but did not set the internal JCHANGED flag - either of these is enough to
528        control the way the "get" function works - but the PCRE_INFO_JCHANGED
529        facility is supposed to tell if (?J) was ever used, so now (?J) at the
530        start sets both bits.
531    
532    4.  Added options (at build time, compile time, exec time) to change \R from
533        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
534    
535    5.  doc/pcresyntax.html was missing from the distribution.
536    
537    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
538        compatibility, even though it is no longer used.
539    
540    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
541        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
542        windows.h file is present (where different names are used). [This was
543        reversed later after testing - see 16 below.]
544    
545    8.  Changed all #include <config.h> to #include "config.h". There were also
546        some further <pcre.h> cases that I changed to "pcre.h".
547    
548    9.  When pcregrep was used with the --colour option, it missed the line ending
549        sequence off the lines that it output.
550    
551    10. It was pointed out to me that arrays of string pointers cause lots of
552        relocations when a shared library is dynamically loaded. A technique of
553        using a single long string with a table of offsets can drastically reduce
554        these. I have refactored PCRE in four places to do this. The result is
555        dramatic:
556    
557          Originally:                          290
558          After changing UCP table:            187
559          After changing error message table:   43
560          After changing table of "verbs"       36
561          After changing table of Posix names   22
562    
563        Thanks to the folks working on Gregex for glib for this insight.
564    
565    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
566        unicode-properties was also set.
567    
568    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
569    
570    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
571        checked only for CRLF.
572    
573    14. Added casts to pcretest.c to avoid compiler warnings.
574    
575    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
576    
577    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
578        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
579        entirely. This removes changes made in 7 above.
580    
581    17. The CMake files have been updated, and there is now more information about
582        building with CMake in the NON-UNIX-USE document.
583    
584    
585    Version 7.3 28-Aug-07
586    ---------------------
587    
588     1. In the rejigging of the build system that eventually resulted in 7.1, the
589        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
590        brackets there is not right, since it causes compilers to look for an
591        installed pcre.h, not the version that is in the source that is being
592        compiled (which of course may be different). I have changed it back to:
593    
594          #include "pcre.h"
595    
596        I have a vague recollection that the change was concerned with compiling in
597        different directories, but in the new build system, that is taken care of
598        by the VPATH setting the Makefile.
599    
600     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
601        when the subject happened to end in the byte 0x85 (e.g. if the last
602        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
603        characters but of course it shouldn't be taken as a newline when it is part
604        of another character. The bug was that, for an unlimited repeat of . in
605        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
606        characters when looking for a newline.
607    
608     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
609    
610     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
611        in debug output.
612    
613     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
614        long printing in the pcrecpp unittest when running under MinGW.
615    
616     6. ESC_K was left out of the EBCDIC table.
617    
618     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
619        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
620        limit also applies to "virtual nesting" when a pattern is recursive, and in
621        this case 1000 isn't so big. I have been able to remove this limit at the
622        expense of backing off one optimization in certain circumstances. Normally,
623        when pcre_exec() would call its internal match() function recursively and
624        immediately return the result unconditionally, it uses a "tail recursion"
625        feature to save stack. However, when a subpattern that can match an empty
626        string has an unlimited repetition quantifier, it no longer makes this
627        optimization. That gives it a stack frame in which to save the data for
628        checking that an empty string has been matched. Previously this was taken
629        from the 1000-entry workspace that had been reserved. So now there is no
630        explicit limit, but more stack is used.
631    
632     8. Applied Daniel's patches to solve problems with the import/export magic
633        syntax that is required for Windows, and which was going wrong for the
634        pcreposix and pcrecpp parts of the library. These were overlooked when this
635        problem was solved for the main library.
636    
637     9. There were some crude static tests to avoid integer overflow when computing
638        the size of patterns that contain repeated groups with explicit upper
639        limits. As the maximum quantifier is 65535, the maximum group length was
640        set at 30,000 so that the product of these two numbers did not overflow a
641        32-bit integer. However, it turns out that people want to use groups that
642        are longer than 30,000 bytes (though not repeat them that many times).
643        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
644        made it possible to implement the integer overflow checks in a much more
645        dynamic way, which I have now done. The artificial limitation on group
646        length has been removed - we now have only the limit on the total length of
647        the compiled pattern, which depends on the LINK_SIZE setting.
648    
649    10. Fixed a bug in the documentation for get/copy named substring when
650        duplicate names are permitted. If none of the named substrings are set, the
651        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
652        empty string.
653    
654    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
655        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
656        because the ] is interpreted as the first data character and the
657        terminating ] is not found. PCRE has been made compatible with Perl in this
658        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
659        cause memory overwriting.
660    
661    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
662        string has been matched (to stop an infinite loop). It was not recognizing
663        a conditional subpattern that could match an empty string if that
664        subpattern was within another subpattern. For example, it looped when
665        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
666        condition was not nested. This bug has been fixed.
667    
668    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
669        past the start of the subject in the presence of bytes with the top bit
670        set, for example "\x8aBCD".
671    
672    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
673        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
674    
675    14. Optimized (?!) to (*FAIL).
676    
677    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
678        This restricts code points to be within the range 0 to 0x10FFFF, excluding
679        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
680        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
681        does: it's just the validity check that is more restrictive.
682    
683    16. Inserted checks for integer overflows during escape sequence (backslash)
684        processing, and also fixed erroneous offset values for syntax errors during
685        backslash processing.
686    
687    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
688        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
689    
690    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
691        caused an overrun.
692    
693    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
694        something other than just ASCII characters) inside a group that had an
695        unlimited repeat caused a loop at compile time (while checking to see
696        whether the group could match an empty string).
697    
698    20. Debugging a pattern containing \p or \P could cause a crash. For example,
699        [\P{Any}] did so. (Error in the code for printing property names.)
700    
701    21. An orphan \E inside a character class could cause a crash.
702    
703    22. A repeated capturing bracket such as (A)? could cause a wild memory
704        reference during compilation.
705    
706    23. There are several functions in pcre_compile() that scan along a compiled
707        expression for various reasons (e.g. to see if it's fixed length for look
708        behind). There were bugs in these functions when a repeated \p or \P was
709        present in the pattern. These operators have additional parameters compared
710        with \d, etc, and these were not being taken into account when moving along
711        the compiled data. Specifically:
712    
713        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
714            length.
715    
716        (b) An item such as \pL+ within a repeated group could cause crashes or
717            loops.
718    
719        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
720            "reference to non-existent subpattern" error.
721    
722        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
723    
724    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
725        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
726    
727    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
728    
729    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
730        character were causing crashes (broken optimization).
731    
732    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
733        \p or \P) caused a compile-time loop.
734    
735    28. More problems have arisen in unanchored patterns when CRLF is a valid line
736        break. For example, the unstudied pattern [\r\n]A does not match the string
737        "\r\nA" because change 7.0/46 below moves the current point on by two
738        characters after failing to match at the start. However, the pattern \nA
739        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
740        the same is true. There doesn't seem any very clean way out of this, but
741        what I have chosen to do makes the common cases work: PCRE now takes note
742        of whether there can be an explicit match for \r or \n anywhere in the
743        pattern, and if so, 7.0/46 no longer applies. As part of this change,
744        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
745        pattern has explicit CR or LF references.
746    
747    29. Added (*CR) etc for changing newline setting at start of pattern.
748    
749    
750    Version 7.2 19-Jun-07
751    ---------------------
752    
753     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
754        which is apparently normally available under Windows.
755    
756     2. Re-jig the pcregrep tests with different newline settings in an attempt
757        to make them independent of the local environment's newline setting.
758    
759     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
760    
761     4. Some of the "internals" tests were previously cut out when the link size
762        was not 2, because the output contained actual offsets. The recent new
763        "Z" feature of pcretest means that these can be cut out, making the tests
764        usable with all link sizes.
765    
766     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
767        stack recursion. This gives a massive performance boost under BSD, but just
768        a small improvement under Linux. However, it saves one field in the frame
769        in all cases.
770    
771     6. Added more features from the forthcoming Perl 5.10:
772    
773        (a) (?-n) (where n is a string of digits) is a relative subroutine or
774            recursion call. It refers to the nth most recently opened parentheses.
775    
776        (b) (?+n) is also a relative subroutine call; it refers to the nth next
777            to be opened parentheses.
778    
779        (c) Conditions that refer to capturing parentheses can be specified
780            relatively, for example, (?(-2)... or (?(+3)...
781    
782        (d) \K resets the start of the current match so that everything before
783            is not part of it.
784    
785        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
786    
787        (f) \g{name} is another synonym - part of Perl 5.10's unification of
788            reference syntax.
789    
790        (g) (?| introduces a group in which the numbering of parentheses in each
791            alternative starts with the same number.
792    
793        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
794    
795     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
796        PCRE_INFO_JCHANGED.
797    
798     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
799        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
800        for detecting groups that can match an empty string.
801    
802     9. A pattern with a very large number of alternatives (more than several
803        hundred) was running out of internal workspace during the pre-compile
804        phase, where pcre_compile() figures out how much memory will be needed. A
805        bit of new cunning has reduced the workspace needed for groups with
806        alternatives. The 1000-alternative test pattern now uses 12 bytes of
807        workspace instead of running out of the 4096 that are available.
808    
809    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
810    
811    11. Applied patch from Google to remove an optimization that didn't quite work.
812        The report of the bug said:
813    
814          pcrecpp::RE("a*").FullMatch("aaa") matches, while
815          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
816          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
817    
818    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
819        it matched the wrong number of bytes.
820    
821    
822    Version 7.1 24-Apr-07
823  ---------------------  ---------------------
824    
825   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
# Line 142  Version 7.1 12-Mar-07 Line 960  Version 7.1 12-Mar-07
960    
961  21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or  21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
962      CRLF as a newline sequence.      CRLF as a newline sequence.
963    
964  22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut  22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
965      out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but      out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
966      I have nevertheless tidied it up.      I have nevertheless tidied it up.
967    
968  23. Added some casts to kill warnings from HP-UX ia64 compiler.  23. Added some casts to kill warnings from HP-UX ia64 compiler.
969    
970    24. Added a man page for pcre-config.
971    
972    
973  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06

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