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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.5 12-Nov-07  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 whose
46        condition was an assertion, PCRE could crash during matching, both with
47        pcre_exec() and pcre_dfa_exec().
48    
49    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
50        used for matching.
51    
52    11. Unicode property support in character classes was not working for
53        characters (bytes) greater than 127 when not in UTF-8 mode.
54    
55    12. Added the -M command line option to pcretest.
56    
57    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
58    
59    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
60    
61    16. Added comments and documentation about mis-use of no_arg in the C++
62        wrapper.
63    
64    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
65        from Martin Jerabek that uses macro names for all relevant character and
66        string constants.
67    
68    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
69        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
70        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
71        these, but not everybody uses configure.
72    
73    19. A conditional group that had only one branch was not being correctly
74        recognized as an item that could match an empty string. This meant that an
75        enclosing group might also not be so recognized, causing infinite looping
76        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
77        with the subject "ab", where knowledge that the repeated group can match
78        nothing is needed in order to break the loop.
79    
80    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
81        exec(), but without supplying a callout function, matching went wrong.
82    
83    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
84        leak if the size of the offset vector was greater than 30. When the vector
85        is smaller, the saved offsets during recursion go onto a local stack
86        vector, but for larger vectors malloc() is used. It was failing to free
87        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
88        error, in fact).
89    
90    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
91        heapframe that is used only when UTF-8 support is enabled. This caused no
92        problem, but was untidy.
93    
94    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
95        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
96        included within another project.
97    
98    24. Steven Van Ingelgem's patches to add more options to the CMake support,
99        slightly modified by me:
100    
101          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
102              not building pcregrep.
103    
104          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
105              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
106    
107    
108    Version 7.8 05-Sep-08
109    ---------------------
110    
111    1.  Replaced UCP searching code with optimized version as implemented for Ad
112        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
113        stage table and inline lookup instead of a function, giving speed ups of 2
114        to 5 times on some simple patterns that I tested. Permission was given to
115        distribute the MultiStage2.py script that generates the tables (it's not in
116        the tarball, but is in the Subversion repository).
117    
118    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
119        scripts.
120    
121    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
122        a group with a zero qualifier. The result of the study could be incorrect,
123        or the function might crash, depending on the pattern.
124    
125    4.  Caseless matching was not working for non-ASCII characters in back
126        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
127        It now works when Unicode Property Support is available.
128    
129    5.  In pcretest, an escape such as \x{de} in the data was always generating
130        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
131        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
132        truncation.
133    
134    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
135    
136    7.  Added two (int) casts to pcregrep when printing the difference of two
137        pointers, in case they are 64-bit values.
138    
139    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
140        test 2 if it fails.
141    
142    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
143        and a #define of that name to empty if it is not externally set. This is to
144        allow users of MSVC to set it if necessary.
145    
146    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
147        the convenience functions in the pcre_get.c source file.
148    
149    11. An option change at the start of a pattern that had top-level alternatives
150        could cause overwriting and/or a crash. This command provoked a crash in
151        some environments:
152    
153          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
154    
155        This potential security problem was recorded as CVE-2008-2371.
156    
157    12. For a pattern where the match had to start at the beginning or immediately
158        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
159        pcre_dfa_exec() could read past the end of the passed subject if there was
160        no match. To help with detecting such bugs (e.g. with valgrind), I modified
161        pcretest so that it places the subject at the end of its malloc-ed buffer.
162    
163    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
164        exec() might read past the end of the data buffer in UTF-8 mode.
165    
166    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
167        the data contained the byte 0x85 as part of a UTF-8 character within its
168        first line. This applied both to normal and DFA matching.
169    
170    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
171        /^[^d]*?$/8 failed to match "abc".
172    
173    16. Added a missing copyright notice to pcrecpp_internal.h.
174    
175    17. Make it more clear in the documentation that values returned from
176        pcre_exec() in ovector are byte offsets, not character counts.
177    
178    18. Tidied a few places to stop certain compilers from issuing warnings.
179    
180    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
181        supplied by Stefan Weber. I made a further small update for 7.8 because
182        there is a change of source arrangements: the pcre_searchfuncs.c module is
183        replaced by pcre_ucd.c.
184    
185    
186    Version 7.7 07-May-08
187    ---------------------
188    
189    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
190        a string to a long long, pretend we don't even have a long long." This is
191        done by checking for the strtoq, strtoll, and _strtoi64 functions.
192    
193    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
194        pre-7.6 versions, which defined a global no_arg variable instead of putting
195        it in the RE class. (See also #8 below.)
196    
197    3.  Remove a line of dead code, identified by coverity and reported by Nuno
198        Lopes.
199    
200    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
201    
202        (1) The include/exclude patterns were being applied to the whole pathnames
203            of files, instead of just to the final components.
204    
205        (2) If there was more than one level of directory, the subdirectories were
206            skipped unless they satisfied the include/exclude conditions. This is
207            inconsistent with GNU grep (and could even be seen as contrary to the
208            pcregrep specification - which I improved to make it absolutely clear).
209            The action now is always to scan all levels of directory, and just
210            apply the include/exclude patterns to regular files.
211    
212    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
213        --exclude_dir in the tests to avoid scanning .svn directories.
214    
215    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
216        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
217        doesn't support NULs in patterns.
218    
219    7.  Added some missing "const"s to declarations of static tables in
220        pcre_compile.c and pcre_dfa_exec.c.
221    
222    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
223        caused by fix #2  above. (Subsequently also a second patch to fix the
224        first patch. And a third patch - this was a messy problem.)
225    
226    9.  Applied Craig's patch to remove the use of push_back().
227    
228    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
229        matching function regexec().
230    
231    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
232        which, however, unlike Perl's \g{...}, are subroutine calls, not back
233        references. PCRE supports relative numbers with this syntax (I don't think
234        Oniguruma does).
235    
236    12. Previously, a group with a zero repeat such as (...){0} was completely
237        omitted from the compiled regex. However, this means that if the group
238        was called as a subroutine from elsewhere in the pattern, things went wrong
239        (an internal error was given). Such groups are now left in the compiled
240        pattern, with a new opcode that causes them to be skipped at execution
241        time.
242    
243    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
244        to the way PCRE behaves:
245    
246        (a) A lone ] character is dis-allowed (Perl treats it as data).
247    
248        (b) A back reference to an unmatched subpattern matches an empty string
249            (Perl fails the current match path).
250    
251        (c) A data ] in a character class must be notated as \] because if the
252            first data character in a class is ], it defines an empty class. (In
253            Perl it is not possible to have an empty class.) The empty class []
254            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
255            The negative empty class [^] matches any one character, independently
256            of the DOTALL setting.
257    
258    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
259        non-existent subpattern following a character class starting with ']' and
260        containing () gave an internal compiling error instead of "reference to
261        non-existent subpattern". Fortunately, when the pattern did exist, the
262        compiled code was correct. (When scanning forwards to check for the
263        existencd of the subpattern, it was treating the data ']' as terminating
264        the class, so got the count wrong. When actually compiling, the reference
265        was subsequently set up correctly.)
266    
267    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
268        it was being rejected as not supported by pcre_dfa_exec(), even though
269        other assertions are supported. I have made pcre_dfa_exec() support
270        (*FAIL).
271    
272    16. The implementation of 13c above involved the invention of a new opcode,
273        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
274        cannot be changed at match time, I realized I could make a small
275        improvement to matching performance by compiling OP_ALLANY instead of
276        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
277        on the OP_ANY path.
278    
279    17. Compiling pcretest on Windows with readline support failed without the
280        following two fixes: (1) Make the unistd.h include conditional on
281        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
282    
283    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
284        ncurses library to be included for pcretest when ReadLine support is
285        requested, but also to allow for it to be overridden. This patch came from
286        Daniel Bergström.
287    
288    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
289        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
290        any errors with the current Unicode tables. Thanks to Peter Kankowski for
291        spotting this.
292    
293    
294    Version 7.6 28-Jan-08
295    ---------------------
296    
297    1.  A character class containing a very large number of characters with
298        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
299        overflow.
300    
301    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
302        HAVE_LONG_LONG is not defined.
303    
304    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
305        bring them up to date and include new features. This patch includes:
306    
307        - Fixed PH's badly added libz and libbz2 support.
308        - Fixed a problem with static linking.
309        - Added pcredemo. [But later removed - see 7 below.]
310        - Fixed dftables problem and added an option.
311        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
312            HAVE_LONG_LONG.
313        - Added readline support for pcretest.
314        - Added an listing of the option settings after cmake has run.
315    
316    4.  A user submitted a patch to Makefile that makes it easy to create
317        "pcre.dll" under mingw when using Configure/Make. I added stuff to
318        Makefile.am that cause it to include this special target, without
319        affecting anything else. Note that the same mingw target plus all
320        the other distribution libraries and programs are now supported
321        when configuring with CMake (see 6 below) instead of with
322        Configure/Make.
323    
324    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
325        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
326        exported in the Windows port". It has not yet been confirmed that the patch
327        solves the problem, but it does no harm.
328    
329    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
330        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
331        with CMake, and also correct the comment about stack recursion.
332    
333    7.  Remove the automatic building of pcredemo from the ./configure system and
334        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
335        of a program that users should build themselves after PCRE is installed, so
336        building it automatically is not really right. What is more, it gave
337        trouble in some build environments.
338    
339    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
340    
341    
342    Version 7.5 10-Jan-08
343  ---------------------  ---------------------
344    
345  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
346      values in parens when parsing an RE using the C++ wrapper."      values in parens when parsing an RE using the C++ wrapper."
347    
348  2.  Negative specials like \S did not work in character classes in UTF-8 mode.  2.  Negative specials like \S did not work in character classes in UTF-8 mode.
349      Characters greater than 255 were excluded from the class instead of being      Characters greater than 255 were excluded from the class instead of being
350      included.      included.
351    
352  3.  The same bug as (2) above applied to negated POSIX classes such as  3.  The same bug as (2) above applied to negated POSIX classes such as
353      [:^space:].      [:^space:].
354    
355  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
356      defined or documented. It seems to have been a typo for PCRE_STATIC, so      defined or documented. It seems to have been a typo for PCRE_STATIC, so
357      I have changed it.      I have changed it.
358    
359  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
360      first named subpattern) and a construct such as (?&a) would reference the      first named subpattern) and a construct such as (?&a) would reference the
361      first named subpattern whose name started with "a" (in other words, the      first named subpattern whose name started with "a" (in other words, the
362      length check was missing).      length check was missing). Both these problems are fixed. "Subpattern name
363        expected" is now given for (?&) (a zero-length name), and this patch also
364        makes it give the same error for \k'' (previously it complained that that
365        was a reference to a non-existent subpattern).
366    
367  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
368      this is right because (?- can be followed by option settings as well as by      this is right because (?- can be followed by option settings as well as by
369      digits. I have, however, made the messages clearer.      digits. I have, however, made the messages clearer.
370    
371  7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns  7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
372      than the number used in the conditional) now cause a compile-time error.      than the number used in the conditional) now cause a compile-time error.
373      This is actually not compatible with Perl, which accepts such patterns, but      This is actually not compatible with Perl, which accepts such patterns, but
374      treats the conditional as always being FALSE (as PCRE used to), but it      treats the conditional as always being FALSE (as PCRE used to), but it
375      seems to me that giving a diagnostic is better.      seems to me that giving a diagnostic is better.
376    
377    8.  Change "alphameric" to the more common word "alphanumeric" in comments
378        and messages.
379    
380    9.  Fix two occurrences of "backslash" in comments that should have been
381        "backspace".
382    
383    10. Remove two redundant lines of code that can never be obeyed (their function
384        was moved elsewhere).
385    
386    11. The program that makes PCRE's Unicode character property table had a bug
387        which caused it to generate incorrect table entries for sequences of
388        characters that have the same character type, but are in different scripts.
389        It amalgamated them into a single range, with the script of the first of
390        them. In other words, some characters were in the wrong script. There were
391        thirteen such cases, affecting characters in the following ranges:
392    
393          U+002b0 - U+002c1
394          U+0060c - U+0060d
395          U+0061e - U+00612
396          U+0064b - U+0065e
397          U+0074d - U+0076d
398          U+01800 - U+01805
399          U+01d00 - U+01d77
400          U+01d9b - U+01dbf
401          U+0200b - U+0200f
402          U+030fc - U+030fe
403          U+03260 - U+0327f
404          U+0fb46 - U+0fbb1
405          U+10450 - U+1049d
406    
407    12. The -o option (show only the matching part of a line) for pcregrep was not
408        compatible with GNU grep in that, if there was more than one match in a
409        line, it showed only the first of them. It now behaves in the same way as
410        GNU grep.
411    
412    13. If the -o and -v options were combined for pcregrep, it printed a blank
413        line for every non-matching line. GNU grep prints nothing, and pcregrep now
414        does the same. The return code can be used to tell if there were any
415        non-matching lines.
416    
417    14. Added --file-offsets and --line-offsets to pcregrep.
418    
419    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
420        infinitely looping recursion. The bug was that positive lookaheads were not
421        being skipped when checking for a possible empty match (negative lookaheads
422        and both kinds of lookbehind were skipped).
423    
424    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
425        inclusion of <windows.h> to before rather than after the definition of
426        INVALID_FILE_ATTRIBUTES (patch from David Byron).
427    
428    17. Specifying a possessive quantifier with a specific limit for a Unicode
429        character property caused pcre_compile() to compile bad code, which led at
430        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
431        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
432        caused the error; without that there was no problem.
433    
434    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
435    
436    19. Added --enable-pcretest-libreadline.
437    
438    20. In pcrecpp.cc, the variable 'count' was incremented twice in
439        RE::GlobalReplace(). As a result, the number of replacements returned was
440        double what it should be. I removed one of the increments, but Craig sent a
441        later patch that removed the other one (the right fix) and added unit tests
442        that check the return values (which was not done before).
443    
444    21. Several CMake things:
445    
446        (1) Arranged that, when cmake is used on Unix, the libraries end up with
447            the names libpcre and libpcreposix, not just pcre and pcreposix.
448    
449        (2) The above change means that pcretest and pcregrep are now correctly
450            linked with the newly-built libraries, not previously installed ones.
451    
452        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
453    
454    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
455        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
456        UTF-8 newline character). The key issue is that the pattern starts .*;
457        this means that the match must be either at the beginning, or after a
458        newline. The bug was in the code for advancing after a failed match and
459        checking that the new position followed a newline. It was not taking
460        account of UTF-8 characters correctly.
461    
462    23. PCRE was behaving differently from Perl in the way it recognized POSIX
463        character classes. PCRE was not treating the sequence [:...:] as a
464        character class unless the ... were all letters. Perl, however, seems to
465        allow any characters between [: and :], though of course it rejects as
466        unknown any "names" that contain non-letters, because all the known class
467        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
468        for example, whereas PCRE did not - it did not recognize a POSIX character
469        class. This seemed a bit dangerous, so the code has been changed to be
470        closer to Perl. The behaviour is not identical to Perl, because PCRE will
471        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
472        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
473        Perl does, and where it didn't before.
474    
475    24. Rewrite so as to remove the single use of %n from pcregrep because in some
476        Windows environments %n is disabled by default.
477    
478    
479  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07
480  ---------------------  ---------------------

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