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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.0 02 Jul-08  Version 8.01 11-Dec-09
5    ----------------------
7    1.  If a pattern contained a conditional subpattern with only one branch (in
8        particular, this includes all (DEFINE) patterns), a call to pcre_study()
9        computed the wrong minimum data length (which is of course zero for such
10        subpatterns).
12    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
13        the pattern is reset in the first branch, pcre_compile() failed with
14        "internal error: code overflow at offset...". This happened only when
15        the reset was to the original external option setting. (An optimization
16        abstracts leading options settings into an external setting, which was the
17        cause of this.)
19    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
20        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
21        assertion pattern did not match (meaning that the assertion was true), it
22        was incorrectly treated as false if the SKIP had been reached during the
23        matching. This also applied to assertions used as conditions.
25    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
26        assertion subpattern, including such a pattern used as a condition,
27        unpredictable results occurred, instead of the error return
30    5.  The C++ GlobalReplace function was not working like Perl for the special
31        situation when an empty string is matched. It now does the fancy magic
32        stuff that is necessary.
34    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
35        removed. (These were left over from very, very early versions of PCRE.)
37    7.  Some cosmetic changes to the code to make life easier when compiling it
38        as part of something else:
40        (a) Change DEBUG to PCRE_DEBUG.
42        (b) In pcre_compile(), rename the member of the "branch_chain" structure
43            called "current" as "current_branch", to prevent a collision with the
44            Linux macro when compiled as a kernel module.
46        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
47            prevent a collision with the Linux macro when compiled as a kernel
48            module.
50    8.  In pcre_compile() there are some checks for integer overflows that used to
51        cast potentially large values to (double). This has been changed to that
52        when building, a check for int64_t is made, and if it is found, it is used
53        instead, thus avoiding the use of floating point arithmetic. (There is no
54        other use of FP in PCRE.) If int64_t is not found, the fallback is to
55        double.
57    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
58        2005 (difference between two addresses compared to an unsigned value).
60    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
61        custom one, because of the following reported problem in Windows:
63          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
64            under Win32.
65          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
66            therefore missing the function definition.
67          - The compiler thus generates a "C" signature for the test function.
68          - The linker fails to find the "C" function.
69          - PCRE fails to configure if asked to do so against libbz2.
72    Version 8.00 19-Oct-09
73    ----------------------
75    1.  The table for translating pcre_compile() error codes into POSIX error codes
76        was out-of-date, and there was no check on the pcre_compile() error code
77        being within the table. This could lead to an OK return being given in
78        error.
80    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
81        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
82        in a Windows environment.
84    3.  The pcregrep --count option prints the count for each file even when it is
85        zero, as does GNU grep. However, pcregrep was also printing all files when
86        --files-with-matches was added. Now, when both options are given, it prints
87        counts only for those files that have at least one match. (GNU grep just
88        prints the file name in this circumstance, but including the count seems
89        more useful - otherwise, why use --count?) Also ensured that the
90        combination -clh just lists non-zero counts, with no names.
92    4.  The long form of the pcregrep -F option was incorrectly implemented as
93        --fixed_strings instead of --fixed-strings. This is an incompatible change,
94        but it seems right to fix it, and I didn't think it was worth preserving
95        the old behaviour.
97    5.  The command line items --regex=pattern and --regexp=pattern were not
98        recognized by pcregrep, which required --regex pattern or --regexp pattern
99        (with a space rather than an '='). The man page documented the '=' forms,
100        which are compatible with GNU grep; these now work.
102    6.  No libpcreposix.pc file was created for pkg-config; there was just
103        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
105    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
106        when UCP support is not needed, by modifying the Python script that
107        generates it from Unicode data files. This should not matter if the module
108        is correctly used as a library, but I received one complaint about 50K of
109        unwanted data. My guess is that the person linked everything into his
110        program rather than using a library. Anyway, it does no harm.
112    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
113        was a minimum greater than 1 for a wide character in a possessive
114        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
115        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
116        character. Chaos in the form of incorrect output or a compiling loop could
117        result.
119    9.  The restrictions on what a pattern can contain when partial matching is
120        requested for pcre_exec() have been removed. All patterns can now be
121        partially matched by this function. In addition, if there are at least two
122        slots in the offset vector, the offset of the earliest inspected character
123        for the match and the offset of the end of the subject are set in them when
124        PCRE_ERROR_PARTIAL is returned.
126    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
127        synonymous with PCRE_PARTIAL, for backwards compatibility, and
128        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
129        and may be more useful for multi-segment matching.
131    11. Partial matching with pcre_exec() is now more intuitive. A partial match
132        used to be given if ever the end of the subject was reached; now it is
133        given only if matching could not proceed because another character was
134        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
135        string "Z", which now yields "no match" instead of "partial match". In the
136        case of pcre_dfa_exec(), "no match" is given if every matching path for the
137        final character ended with (*FAIL).
139    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
140        if the pattern had a "must contain" character that was already found in the
141        earlier partial match, unless partial matching was again requested. For
142        example, with the pattern /dog.(body)?/, the "must contain" character is
143        "g". If the first part-match was for the string "dog", restarting with
144        "sbody" failed. This bug has been fixed.
146    13. The string returned by pcre_dfa_exec() after a partial match has been
147        changed so that it starts at the first inspected character rather than the
148        first character of the match. This makes a difference only if the pattern
149        starts with a lookbehind assertion or \b or \B (\K is not supported by
150        pcre_dfa_exec()). It's an incompatible change, but it makes the two
151        matching functions compatible, and I think it's the right thing to do.
153    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
154        so that the demonstration program is easily available in environments where
155        PCRE has not been installed from source.
157    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
158        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
159        library.
161    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
162        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
163        is not the first non-POSIX option to be added. Clearly some people find
164        these options useful.
166    17. If a caller to the POSIX matching function regexec() passes a non-zero
167        value for nmatch with a NULL value for pmatch, the value of
168        nmatch is forced to zero.
170    18. RunGrepTest did not have a test for the availability of the -u option of
171        the diff command, as RunTest does. It now checks in the same way as
172        RunTest, and also checks for the -b option.
174    19. If an odd number of negated classes containing just a single character
175        interposed, within parentheses, between a forward reference to a named
176        subpattern and the definition of the subpattern, compilation crashed with
177        an internal error, complaining that it could not find the referenced
178        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
179        [The bug was that it was starting one character too far in when skipping
180        over the character class, thus treating the ] as data rather than
181        terminating the class. This meant it could skip too much.]
183    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
184        /g option in pcretest when the pattern contains \K, which makes it possible
185        to have an empty string match not at the start, even when the pattern is
186        anchored. Updated pcretest and pcredemo to use this option.
188    21. If the maximum number of capturing subpatterns in a recursion was greater
189        than the maximum at the outer level, the higher number was returned, but
190        with unset values at the outer level. The correct (outer level) value is
191        now given.
193    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
194        PCRE did not set those parentheses (unlike Perl). I have now found a way to
195        make it do so. The string so far is captured, making this feature
196        compatible with Perl.
198    23. The tests have been re-organized, adding tests 11 and 12, to make it
199        possible to check the Perl 5.10 features against Perl 5.10.
201    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
202        pattern matches a fixed length string. PCRE did not allow this; now it
203        does. Neither allows recursion.
205    25. I finally figured out how to implement a request to provide the minimum
206        length of subject string that was needed in order to match a given pattern.
207        (It was back references and recursion that I had previously got hung up
208        on.) This code has now been added to pcre_study(); it finds a lower bound
209        to the length of subject needed. It is not necessarily the greatest lower
210        bound, but using it to avoid searching strings that are too short does give
211        some useful speed-ups. The value is available to calling programs via
212        pcre_fullinfo().
214    26. While implementing 25, I discovered to my embarrassment that pcretest had
215        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
216        study optimizations had never been tested with that matching function.
217        Oops. What is worse, even when it was passed study data, there was a bug in
218        pcre_dfa_exec() that meant it never actually used it. Double oops. There
219        were also very few tests of studied patterns with pcre_dfa_exec().
221    27. If (?| is used to create subpatterns with duplicate numbers, they are now
222        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
223        on the other side of the coin, they are no longer allowed to have different
224        names, because these cannot be distinguished in PCRE, and this has caused
225        confusion. (This is a difference from Perl.)
227    28. When duplicate subpattern names are present (necessarily with different
228        numbers, as required by 27 above), and a test is made by name in a
229        conditional pattern, either for a subpattern having been matched, or for
230        recursion in such a pattern, all the associated numbered subpatterns are
231        tested, and the overall condition is true if the condition is true for any
232        one of them. This is the way Perl works, and is also more like the way
233        testing by number works.
236    Version 7.9 11-Apr-09
237    ---------------------
239    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
240        (pcretest), all targets were linked against these libraries. This included
241        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
242        libraries. This caused unwanted dependencies to be created. This problem
243        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
244        pcretest is linked with readline.
246    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
247        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
248        moved outside it again, because FALSE and TRUE are already defined in AIX,
249        but BOOL is not.
251    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
252        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
254    4.  The pcregrep documentation said spaces were inserted as well as colons (or
255        hyphens) following file names and line numbers when outputting matching
256        lines. This is not true; no spaces are inserted. I have also clarified the
257        wording for the --colour (or --color) option.
259    5.  In pcregrep, when --colour was used with -o, the list of matching strings
260        was not coloured; this is different to GNU grep, so I have changed it to be
261        the same.
263    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
264        each matching line was coloured. Now it goes on to look for further matches
265        of any of the test patterns, which is the same behaviour as GNU grep.
267    7.  A pattern that could match an empty string could cause pcregrep to loop; it
268        doesn't make sense to accept an empty string match in pcregrep, so I have
269        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
270        seems to be how GNU grep behaves.
272    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
273        start or after a newline", because the conditional assertion was not being
274        correctly handled. The rule now is that both the assertion and what follows
275        in the first alternative must satisfy the test.
277    9.  If auto-callout was enabled in a pattern with a conditional group whose
278        condition was an assertion, PCRE could crash during matching, both with
279        pcre_exec() and pcre_dfa_exec().
281    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
282        used for matching.
284    11. Unicode property support in character classes was not working for
285        characters (bytes) greater than 127 when not in UTF-8 mode.
287    12. Added the -M command line option to pcretest.
289    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
291    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
293    16. Added comments and documentation about mis-use of no_arg in the C++
294        wrapper.
296    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
297        from Martin Jerabek that uses macro names for all relevant character and
298        string constants.
300    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
301        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
302        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
303        these, but not everybody uses configure.
305    19. A conditional group that had only one branch was not being correctly
306        recognized as an item that could match an empty string. This meant that an
307        enclosing group might also not be so recognized, causing infinite looping
308        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
309        with the subject "ab", where knowledge that the repeated group can match
310        nothing is needed in order to break the loop.
312    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
313        exec(), but without supplying a callout function, matching went wrong.
315    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
316        leak if the size of the offset vector was greater than 30. When the vector
317        is smaller, the saved offsets during recursion go onto a local stack
318        vector, but for larger vectors malloc() is used. It was failing to free
319        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
320        error, in fact).
322    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
323        heapframe that is used only when UTF-8 support is enabled. This caused no
324        problem, but was untidy.
326    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
327        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
328        included within another project.
330    24. Steven Van Ingelgem's patches to add more options to the CMake support,
331        slightly modified by me:
333          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
334              not building pcregrep.
336          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
337              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
339    25. Forward references, both numeric and by name, in patterns that made use of
340        duplicate group numbers, could behave incorrectly or give incorrect errors,
341        because when scanning forward to find the reference group, PCRE was not
342        taking into account the duplicate group numbers. A pattern such as
343        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
345    26. Changed a few more instances of "const unsigned char *" to USPTR, making
346        the feature of a custom pointer more persuasive (as requested by a user).
348    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
349        pcretest.c, inside #ifndefs, because it seems they are sometimes already
350        pre-defined.
352    28. Added support for (*UTF8) at the start of a pattern.
354    29. Arrange for flags added by the "release type" setting in CMake to be shown
355        in the configuration summary.
358    Version 7.8 05-Sep-08
359  ---------------------  ---------------------
361  1.  Replaced UCP searching code with optimized version as implemented for Ad  1.  Replaced UCP searching code with optimized version as implemented for Ad
# Line 13  Version 8.0 02 Jul-08 Line 367  Version 8.0 02 Jul-08
368  2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more  2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
369      scripts.      scripts.
371  3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained  3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
372      a group with a zero qualifier. The result of the study could be incorrect,      a group with a zero qualifier. The result of the study could be incorrect,
373      or the function might crash, depending on the pattern.      or the function might crash, depending on the pattern.
375  4.  Caseless matching was not working for non-ASCII characters in back  4.  Caseless matching was not working for non-ASCII characters in back
376      references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.      references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
377      It now works when Unicode Property Support is available.      It now works when Unicode Property Support is available.
379  5.  In pcretest, an escape such as \x{de} in the data was always generating  5.  In pcretest, an escape such as \x{de} in the data was always generating
380      a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in      a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
381      non-UTF-8 mode. If the value is greater than 255, it gives a warning about      non-UTF-8 mode. If the value is greater than 255, it gives a warning about
382      truncation.      truncation.
384    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
386    7.  Added two (int) casts to pcregrep when printing the difference of two
387        pointers, in case they are 64-bit values.
389    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
390        test 2 if it fails.
392    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
393        and a #define of that name to empty if it is not externally set. This is to
394        allow users of MSVC to set it if necessary.
396    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
397        the convenience functions in the pcre_get.c source file.
399    11. An option change at the start of a pattern that had top-level alternatives
400        could cause overwriting and/or a crash. This command provoked a crash in
401        some environments:
403          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
405        This potential security problem was recorded as CVE-2008-2371.
407    12. For a pattern where the match had to start at the beginning or immediately
408        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
409        pcre_dfa_exec() could read past the end of the passed subject if there was
410        no match. To help with detecting such bugs (e.g. with valgrind), I modified
411        pcretest so that it places the subject at the end of its malloc-ed buffer.
413    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
414        exec() might read past the end of the data buffer in UTF-8 mode.
416    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
417        the data contained the byte 0x85 as part of a UTF-8 character within its
418        first line. This applied both to normal and DFA matching.
420    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
421        /^[^d]*?$/8 failed to match "abc".
423    16. Added a missing copyright notice to pcrecpp_internal.h.
425    17. Make it more clear in the documentation that values returned from
426        pcre_exec() in ovector are byte offsets, not character counts.
428    18. Tidied a few places to stop certain compilers from issuing warnings.
430    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
431        supplied by Stefan Weber. I made a further small update for 7.8 because
432        there is a change of source arrangements: the pcre_searchfuncs.c module is
433        replaced by pcre_ucd.c.
436  Version 7.7 07-May-08  Version 7.7 07-May-08

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