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revision 347 by ph10, Wed May 7 16:38:04 2008 UTC revision 437 by ph10, Sun Sep 6 16:34:42 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    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8        was out-of-date, and there was no check on the pcre_compile() error code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 \fInmatch\fP with a NULL value for \fIpmatch\fP, the value of
101        \fInmatch\fP 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    
108    Version 7.9 11-Apr-09
109    ---------------------
110    
111    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
112        (pcretest), all targets were linked against these libraries. This included
113        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
114        libraries. This caused unwanted dependencies to be created. This problem
115        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
116        pcretest is linked with readline.
117    
118    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
119        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
120        moved outside it again, because FALSE and TRUE are already defined in AIX,
121        but BOOL is not.
122    
123    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
124        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
125    
126    4.  The pcregrep documentation said spaces were inserted as well as colons (or
127        hyphens) following file names and line numbers when outputting matching
128        lines. This is not true; no spaces are inserted. I have also clarified the
129        wording for the --colour (or --color) option.
130    
131    5.  In pcregrep, when --colour was used with -o, the list of matching strings
132        was not coloured; this is different to GNU grep, so I have changed it to be
133        the same.
134    
135    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
136        each matching line was coloured. Now it goes on to look for further matches
137        of any of the test patterns, which is the same behaviour as GNU grep.
138    
139    7.  A pattern that could match an empty string could cause pcregrep to loop; it
140        doesn't make sense to accept an empty string match in pcregrep, so I have
141        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
142        seems to be how GNU grep behaves.
143    
144    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
145        start or after a newline", because the conditional assertion was not being
146        correctly handled. The rule now is that both the assertion and what follows
147        in the first alternative must satisfy the test.
148    
149    9.  If auto-callout was enabled in a pattern with a conditional group whose
150        condition was an assertion, PCRE could crash during matching, both with
151        pcre_exec() and pcre_dfa_exec().
152    
153    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
154        used for matching.
155    
156    11. Unicode property support in character classes was not working for
157        characters (bytes) greater than 127 when not in UTF-8 mode.
158    
159    12. Added the -M command line option to pcretest.
160    
161    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
162    
163    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
164    
165    16. Added comments and documentation about mis-use of no_arg in the C++
166        wrapper.
167    
168    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
169        from Martin Jerabek that uses macro names for all relevant character and
170        string constants.
171    
172    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
173        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
174        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
175        these, but not everybody uses configure.
176    
177    19. A conditional group that had only one branch was not being correctly
178        recognized as an item that could match an empty string. This meant that an
179        enclosing group might also not be so recognized, causing infinite looping
180        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
181        with the subject "ab", where knowledge that the repeated group can match
182        nothing is needed in order to break the loop.
183    
184    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
185        exec(), but without supplying a callout function, matching went wrong.
186    
187    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
188        leak if the size of the offset vector was greater than 30. When the vector
189        is smaller, the saved offsets during recursion go onto a local stack
190        vector, but for larger vectors malloc() is used. It was failing to free
191        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
192        error, in fact).
193    
194    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
195        heapframe that is used only when UTF-8 support is enabled. This caused no
196        problem, but was untidy.
197    
198    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
199        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
200        included within another project.
201    
202    24. Steven Van Ingelgem's patches to add more options to the CMake support,
203        slightly modified by me:
204    
205          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
206              not building pcregrep.
207    
208          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
209              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
210    
211    25. Forward references, both numeric and by name, in patterns that made use of
212        duplicate group numbers, could behave incorrectly or give incorrect errors,
213        because when scanning forward to find the reference group, PCRE was not
214        taking into account the duplicate group numbers. A pattern such as
215        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
216    
217    26. Changed a few more instances of "const unsigned char *" to USPTR, making
218        the feature of a custom pointer more persuasive (as requested by a user).
219    
220    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
221        pcretest.c, inside #ifndefs, because it seems they are sometimes already
222        pre-defined.
223    
224    28. Added support for (*UTF8) at the start of a pattern.
225    
226    29. Arrange for flags added by the "release type" setting in CMake to be shown
227        in the configuration summary.
228    
229    
230    Version 7.8 05-Sep-08
231    ---------------------
232    
233    1.  Replaced UCP searching code with optimized version as implemented for Ad
234        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
235        stage table and inline lookup instead of a function, giving speed ups of 2
236        to 5 times on some simple patterns that I tested. Permission was given to
237        distribute the MultiStage2.py script that generates the tables (it's not in
238        the tarball, but is in the Subversion repository).
239    
240    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
241        scripts.
242    
243    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
244        a group with a zero qualifier. The result of the study could be incorrect,
245        or the function might crash, depending on the pattern.
246    
247    4.  Caseless matching was not working for non-ASCII characters in back
248        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
249        It now works when Unicode Property Support is available.
250    
251    5.  In pcretest, an escape such as \x{de} in the data was always generating
252        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
253        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
254        truncation.
255    
256    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
257    
258    7.  Added two (int) casts to pcregrep when printing the difference of two
259        pointers, in case they are 64-bit values.
260    
261    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
262        test 2 if it fails.
263    
264    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
265        and a #define of that name to empty if it is not externally set. This is to
266        allow users of MSVC to set it if necessary.
267    
268    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
269        the convenience functions in the pcre_get.c source file.
270    
271    11. An option change at the start of a pattern that had top-level alternatives
272        could cause overwriting and/or a crash. This command provoked a crash in
273        some environments:
274    
275          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
276    
277        This potential security problem was recorded as CVE-2008-2371.
278    
279    12. For a pattern where the match had to start at the beginning or immediately
280        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
281        pcre_dfa_exec() could read past the end of the passed subject if there was
282        no match. To help with detecting such bugs (e.g. with valgrind), I modified
283        pcretest so that it places the subject at the end of its malloc-ed buffer.
284    
285    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
286        exec() might read past the end of the data buffer in UTF-8 mode.
287    
288    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
289        the data contained the byte 0x85 as part of a UTF-8 character within its
290        first line. This applied both to normal and DFA matching.
291    
292    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
293        /^[^d]*?$/8 failed to match "abc".
294    
295    16. Added a missing copyright notice to pcrecpp_internal.h.
296    
297    17. Make it more clear in the documentation that values returned from
298        pcre_exec() in ovector are byte offsets, not character counts.
299    
300    18. Tidied a few places to stop certain compilers from issuing warnings.
301    
302    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
303        supplied by Stefan Weber. I made a further small update for 7.8 because
304        there is a change of source arrangements: the pcre_searchfuncs.c module is
305        replaced by pcre_ucd.c.
306    
307    
308  Version 7.7 07-May-08  Version 7.7 07-May-08
309  ---------------------  ---------------------
310    

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