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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.7 05-Mar-08  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8        was out-of-date, and there was no check on the pcre_compile() error code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    3.  The pcregrep --count option prints the count for each file even when it is
17        zero, as does GNU grep. However, pcregrep was also printing all files when
18        --files-with-matches was added. Now, when both options are given, it prints
19        counts only for those files that have at least one match. (GNU grep just
20        prints the file name in this circumstance, but including the count seems
21        more useful - otherwise, why use --count?) Also ensured that the
22        combination -clh just lists non-zero counts, with no names.
23    
24    4.  The long form of the pcregrep -F option was incorrectly implemented as
25        --fixed_strings instead of --fixed-strings. This is an incompatible change,
26        but it seems right to fix it, and I didn't think it was worth preserving
27        the old behaviour.
28    
29    5.  The command line items --regex=pattern and --regexp=pattern were not
30        recognized by pcregrep, which required --regex pattern or --regexp pattern
31        (with a space rather than an '='). The man page documented the '=' forms,
32        which are compatible with GNU grep; these now work.
33    
34    6.  No libpcreposix.pc file was created for pkg-config; there was just
35        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
36    
37    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
38        when UCP support is not needed, by modifying the Python script that
39        generates it from Unicode data files. This should not matter if the module
40        is correctly used as a library, but I received one complaint about 50K of
41        unwanted data. My guess is that the person linked everything into his
42        program rather than using a library. Anyway, it does no harm.
43    
44    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
45        was a minimum greater than 1 for a wide character in a possessive
46        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
47        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
48        character. Chaos in the form of incorrect output or a compiling loop could
49        result.
50    
51    9.  The restrictions on what a pattern can contain when partial matching is
52        requested for pcre_exec() have been removed. All patterns can now be
53        partially matched by this function. In addition, if there are at least two
54        slots in the offset vector, the offset of the earliest inspected character
55        for the match and the offset of the end of the subject are set in them when
56        PCRE_ERROR_PARTIAL is returned.
57    
58    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
59        synonymous with PCRE_PARTIAL, for backwards compatibility, and
60        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
61        and may be more useful for multi-segment matching, especially with
62        pcre_exec().
63    
64    11. Partial matching with pcre_exec() is now more intuitive. A partial match
65        used to be given if ever the end of the subject was reached; now it is
66        given only if matching could not proceed because another character was
67        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
68        string "Z", which now yields "no match" instead of "partial match". In the
69        case of pcre_dfa_exec(), "no match" is given if every matching path for the
70        final character ended with (*FAIL).
71    
72    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
73        if the pattern had a "must contain" character that was already found in the
74        earlier partial match, unless partial matching was again requested. For
75        example, with the pattern /dog.(body)?/, the "must contain" character is
76        "g". If the first part-match was for the string "dog", restarting with
77        "sbody" failed. This bug has been fixed.
78    
79    13. The string returned by pcre_dfa_exec() after a partial match has been
80        changed so that it starts at the first inspected character rather than the
81        first character of the match. This makes a difference only if the pattern
82        starts with a lookbehind assertion or \b or \B (\K is not supported by
83        pcre_dfa_exec()). It's an incompatible change, but it makes the two
84        matching functions compatible, and I think it's the right thing to do.
85    
86    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
87        so that the demonstration program is easily available in environments where
88        PCRE has not been installed from source.
89    
90    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
91        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
92        library.
93    
94    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
95        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
96        is not the first non-POSIX option to be added. Clearly some people find
97        these options useful.
98    
99    17. If a caller to the POSIX matching function regexec() passes a non-zero
100        value for nmatch with a NULL value for pmatch, the value of
101        nmatch is forced to zero.
102    
103    18. RunGrepTest did not have a test for the availability of the -u option of
104        the diff command, as RunTest does. It now checks in the same way as
105        RunTest, and also checks for the -b option.
106    
107    19. If an odd number of negated classes containing just a single character
108        interposed, within parentheses, between a forward reference to a named
109        subpattern and the definition of the subpattern, compilation crashed with
110        an internal error, complaining that it could not find the referenced
111        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
112        [The bug was that it was starting one character too far in when skipping
113        over the character class, thus treating the ] as data rather than
114        terminating the class. This meant it could skip too much.]
115    
116    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
117        /g option in pcretest when the pattern contains \K, which makes it possible
118        to have an empty string match not at the start, even when the pattern is
119        anchored. Updated pcretest and pcredemo to use this option.
120    
121    21. If the maximum number of capturing subpatterns in a recursion was greater
122        than the maximum at the outer level, the higher number was returned, but
123        with unset values at the outer level. The correct (outer level) value is
124        now given.
125    
126    
127    Version 7.9 11-Apr-09
128    ---------------------
129    
130    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
131        (pcretest), all targets were linked against these libraries. This included
132        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
133        libraries. This caused unwanted dependencies to be created. This problem
134        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
135        pcretest is linked with readline.
136    
137    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
138        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
139        moved outside it again, because FALSE and TRUE are already defined in AIX,
140        but BOOL is not.
141    
142    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
143        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
144    
145    4.  The pcregrep documentation said spaces were inserted as well as colons (or
146        hyphens) following file names and line numbers when outputting matching
147        lines. This is not true; no spaces are inserted. I have also clarified the
148        wording for the --colour (or --color) option.
149    
150    5.  In pcregrep, when --colour was used with -o, the list of matching strings
151        was not coloured; this is different to GNU grep, so I have changed it to be
152        the same.
153    
154    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
155        each matching line was coloured. Now it goes on to look for further matches
156        of any of the test patterns, which is the same behaviour as GNU grep.
157    
158    7.  A pattern that could match an empty string could cause pcregrep to loop; it
159        doesn't make sense to accept an empty string match in pcregrep, so I have
160        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
161        seems to be how GNU grep behaves.
162    
163    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
164        start or after a newline", because the conditional assertion was not being
165        correctly handled. The rule now is that both the assertion and what follows
166        in the first alternative must satisfy the test.
167    
168    9.  If auto-callout was enabled in a pattern with a conditional group whose
169        condition was an assertion, PCRE could crash during matching, both with
170        pcre_exec() and pcre_dfa_exec().
171    
172    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
173        used for matching.
174    
175    11. Unicode property support in character classes was not working for
176        characters (bytes) greater than 127 when not in UTF-8 mode.
177    
178    12. Added the -M command line option to pcretest.
179    
180    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
181    
182    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
183    
184    16. Added comments and documentation about mis-use of no_arg in the C++
185        wrapper.
186    
187    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
188        from Martin Jerabek that uses macro names for all relevant character and
189        string constants.
190    
191    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
192        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
193        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
194        these, but not everybody uses configure.
195    
196    19. A conditional group that had only one branch was not being correctly
197        recognized as an item that could match an empty string. This meant that an
198        enclosing group might also not be so recognized, causing infinite looping
199        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
200        with the subject "ab", where knowledge that the repeated group can match
201        nothing is needed in order to break the loop.
202    
203    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
204        exec(), but without supplying a callout function, matching went wrong.
205    
206    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
207        leak if the size of the offset vector was greater than 30. When the vector
208        is smaller, the saved offsets during recursion go onto a local stack
209        vector, but for larger vectors malloc() is used. It was failing to free
210        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
211        error, in fact).
212    
213    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
214        heapframe that is used only when UTF-8 support is enabled. This caused no
215        problem, but was untidy.
216    
217    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
218        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
219        included within another project.
220    
221    24. Steven Van Ingelgem's patches to add more options to the CMake support,
222        slightly modified by me:
223    
224          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
225              not building pcregrep.
226    
227          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
228              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
229    
230    25. Forward references, both numeric and by name, in patterns that made use of
231        duplicate group numbers, could behave incorrectly or give incorrect errors,
232        because when scanning forward to find the reference group, PCRE was not
233        taking into account the duplicate group numbers. A pattern such as
234        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
235    
236    26. Changed a few more instances of "const unsigned char *" to USPTR, making
237        the feature of a custom pointer more persuasive (as requested by a user).
238    
239    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
240        pcretest.c, inside #ifndefs, because it seems they are sometimes already
241        pre-defined.
242    
243    28. Added support for (*UTF8) at the start of a pattern.
244    
245    29. Arrange for flags added by the "release type" setting in CMake to be shown
246        in the configuration summary.
247    
248    
249    Version 7.8 05-Sep-08
250    ---------------------
251    
252    1.  Replaced UCP searching code with optimized version as implemented for Ad
253        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
254        stage table and inline lookup instead of a function, giving speed ups of 2
255        to 5 times on some simple patterns that I tested. Permission was given to
256        distribute the MultiStage2.py script that generates the tables (it's not in
257        the tarball, but is in the Subversion repository).
258    
259    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
260        scripts.
261    
262    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
263        a group with a zero qualifier. The result of the study could be incorrect,
264        or the function might crash, depending on the pattern.
265    
266    4.  Caseless matching was not working for non-ASCII characters in back
267        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
268        It now works when Unicode Property Support is available.
269    
270    5.  In pcretest, an escape such as \x{de} in the data was always generating
271        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
272        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
273        truncation.
274    
275    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
276    
277    7.  Added two (int) casts to pcregrep when printing the difference of two
278        pointers, in case they are 64-bit values.
279    
280    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
281        test 2 if it fails.
282    
283    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
284        and a #define of that name to empty if it is not externally set. This is to
285        allow users of MSVC to set it if necessary.
286    
287    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
288        the convenience functions in the pcre_get.c source file.
289    
290    11. An option change at the start of a pattern that had top-level alternatives
291        could cause overwriting and/or a crash. This command provoked a crash in
292        some environments:
293    
294          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
295    
296        This potential security problem was recorded as CVE-2008-2371.
297    
298    12. For a pattern where the match had to start at the beginning or immediately
299        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
300        pcre_dfa_exec() could read past the end of the passed subject if there was
301        no match. To help with detecting such bugs (e.g. with valgrind), I modified
302        pcretest so that it places the subject at the end of its malloc-ed buffer.
303    
304    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
305        exec() might read past the end of the data buffer in UTF-8 mode.
306    
307    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
308        the data contained the byte 0x85 as part of a UTF-8 character within its
309        first line. This applied both to normal and DFA matching.
310    
311    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
312        /^[^d]*?$/8 failed to match "abc".
313    
314    16. Added a missing copyright notice to pcrecpp_internal.h.
315    
316    17. Make it more clear in the documentation that values returned from
317        pcre_exec() in ovector are byte offsets, not character counts.
318    
319    18. Tidied a few places to stop certain compilers from issuing warnings.
320    
321    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
322        supplied by Stefan Weber. I made a further small update for 7.8 because
323        there is a change of source arrangements: the pcre_searchfuncs.c module is
324        replaced by pcre_ucd.c.
325    
326    
327    Version 7.7 07-May-08
328  ---------------------  ---------------------
329    
330  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
331      a string to a long long, pretend we don't even have a long long." This is      a string to a long long, pretend we don't even have a long long." This is
332      done by checking for the strtoq, strtoll, and _strtoi64 functions.      done by checking for the strtoq, strtoll, and _strtoi64 functions.
333    
334  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
335      pre-7.6 versions, which defined a global no_arg variable instead of putting      pre-7.6 versions, which defined a global no_arg variable instead of putting
336      it in the RE class. (See also #8 below.)      it in the RE class. (See also #8 below.)
337    
338  3.  Remove a line of dead code, identified by coverity and reported by Nuno  3.  Remove a line of dead code, identified by coverity and reported by Nuno
339      Lopes.      Lopes.
340    
341  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
342    
343      (1) The include/exclude patterns were being applied to the whole pathnames      (1) The include/exclude patterns were being applied to the whole pathnames
344          of files, instead of just to the final components.          of files, instead of just to the final components.
345    
346      (2) If there was more than one level of directory, the subdirectories were      (2) If there was more than one level of directory, the subdirectories were
347          skipped unless they satisfied the include/exclude conditions. This is          skipped unless they satisfied the include/exclude conditions. This is
348          inconsistent with GNU grep (and could even be seen as contrary to the          inconsistent with GNU grep (and could even be seen as contrary to the
349          pcregrep specification - which I improved to make it absolutely clear).          pcregrep specification - which I improved to make it absolutely clear).
350          The action now is always to scan all levels of directory, and just          The action now is always to scan all levels of directory, and just
351          apply the include/exclude patterns to regular files.          apply the include/exclude patterns to regular files.
352    
353  5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used  5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
354      --exclude_dir in the tests to avoid scanning .svn directories.      --exclude_dir in the tests to avoid scanning .svn directories.
355    
356  6.  Applied Craig's patch to the QuoteMeta function so that it escapes the  6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
357      NUL character as backslash + 0 rather than backslash + NUL, because PCRE      NUL character as backslash + 0 rather than backslash + NUL, because PCRE
358      doesn't support NULs in patterns.      doesn't support NULs in patterns.
359    
360  7.  Added some missing "const"s to declarations of static tables in  7.  Added some missing "const"s to declarations of static tables in
361      pcre_compile.c and pcre_dfa_exec.c.      pcre_compile.c and pcre_dfa_exec.c.
362    
363  8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was  8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
364      caused by fix #2  above. (Subsequently also a second patch to fix the      caused by fix #2  above. (Subsequently also a second patch to fix the
365      first patch. And a third patch - this was a messy problem.)      first patch. And a third patch - this was a messy problem.)
366    
367  9.  Applied Craig's patch to remove the use of push_back().  9.  Applied Craig's patch to remove the use of push_back().
368    
369  10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX  10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
370      matching function regexec().      matching function regexec().
371    
372    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
373        which, however, unlike Perl's \g{...}, are subroutine calls, not back
374        references. PCRE supports relative numbers with this syntax (I don't think
375        Oniguruma does).
376    
377    12. Previously, a group with a zero repeat such as (...){0} was completely
378        omitted from the compiled regex. However, this means that if the group
379        was called as a subroutine from elsewhere in the pattern, things went wrong
380        (an internal error was given). Such groups are now left in the compiled
381        pattern, with a new opcode that causes them to be skipped at execution
382        time.
383    
384    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
385        to the way PCRE behaves:
386    
387        (a) A lone ] character is dis-allowed (Perl treats it as data).
388    
389        (b) A back reference to an unmatched subpattern matches an empty string
390            (Perl fails the current match path).
391    
392        (c) A data ] in a character class must be notated as \] because if the
393            first data character in a class is ], it defines an empty class. (In
394            Perl it is not possible to have an empty class.) The empty class []
395            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
396            The negative empty class [^] matches any one character, independently
397            of the DOTALL setting.
398    
399    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
400        non-existent subpattern following a character class starting with ']' and
401        containing () gave an internal compiling error instead of "reference to
402        non-existent subpattern". Fortunately, when the pattern did exist, the
403        compiled code was correct. (When scanning forwards to check for the
404        existencd of the subpattern, it was treating the data ']' as terminating
405        the class, so got the count wrong. When actually compiling, the reference
406        was subsequently set up correctly.)
407    
408    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
409        it was being rejected as not supported by pcre_dfa_exec(), even though
410        other assertions are supported. I have made pcre_dfa_exec() support
411        (*FAIL).
412    
413    16. The implementation of 13c above involved the invention of a new opcode,
414        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
415        cannot be changed at match time, I realized I could make a small
416        improvement to matching performance by compiling OP_ALLANY instead of
417        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
418        on the OP_ANY path.
419    
420    17. Compiling pcretest on Windows with readline support failed without the
421        following two fixes: (1) Make the unistd.h include conditional on
422        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
423    
424    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
425        ncurses library to be included for pcretest when ReadLine support is
426        requested, but also to allow for it to be overridden. This patch came from
427        Daniel Bergström.
428    
429    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
430        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
431        any errors with the current Unicode tables. Thanks to Peter Kankowski for
432        spotting this.
433    
434    
435  Version 7.6 28-Jan-08  Version 7.6 28-Jan-08
436  ---------------------  ---------------------

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