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revision 349 by ph10, Wed Jul 2 18:42:11 2008 UTC revision 431 by ph10, Wed Sep 2 09:23:21 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.0 02 Jul-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8        was out-of-date, and there was no check on the pcre_compile() error code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 offsets of the first-encountered partial
55        match are set in them when PCRE_ERROR_PARTIAL is returned.
56    
57    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
58        synonymous with PCRE_PARTIAL, for backwards compatibility, and
59        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
60        and may be more useful for multi-segment matching, especially with
61        pcre_exec().
62    
63    11. Partial matching with pcre_exec() is now more intuitive. A partial match
64        used to be given if ever the end of the subject was reached; now it is
65        given only if matching could not proceed because another character was
66        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
67        string "Z", which now yields "no match" instead of "partial match". In the
68        case of pcre_dfa_exec(), "no match" is given if every matching path for the
69        final character ended with (*FAIL).
70    
71    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
72        if the pattern had a "must contain" character that was already found in the
73        earlier partial match, unless partial matching was again requested. For
74        example, with the pattern /dog.(body)?/, the "must contain" character is
75        "g". If the first part-match was for the string "dog", restarting with
76        "sbody" failed.
77    
78    13. Added a pcredemo man page, created automatically from the pcredemo.c file,
79        so that the demonstration program is easily available in environments where
80        PCRE has not been installed from source.
81    
82    14. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
83        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
84        library.
85    
86    
87    Version 7.9 11-Apr-09
88    ---------------------
89    
90    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
91        (pcretest), all targets were linked against these libraries. This included
92        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
93        libraries. This caused unwanted dependencies to be created. This problem
94        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
95        pcretest is linked with readline.
96    
97    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
98        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
99        moved outside it again, because FALSE and TRUE are already defined in AIX,
100        but BOOL is not.
101    
102    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
103        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
104    
105    4.  The pcregrep documentation said spaces were inserted as well as colons (or
106        hyphens) following file names and line numbers when outputting matching
107        lines. This is not true; no spaces are inserted. I have also clarified the
108        wording for the --colour (or --color) option.
109    
110    5.  In pcregrep, when --colour was used with -o, the list of matching strings
111        was not coloured; this is different to GNU grep, so I have changed it to be
112        the same.
113    
114    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
115        each matching line was coloured. Now it goes on to look for further matches
116        of any of the test patterns, which is the same behaviour as GNU grep.
117    
118    7.  A pattern that could match an empty string could cause pcregrep to loop; it
119        doesn't make sense to accept an empty string match in pcregrep, so I have
120        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
121        seems to be how GNU grep behaves.
122    
123    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
124        start or after a newline", because the conditional assertion was not being
125        correctly handled. The rule now is that both the assertion and what follows
126        in the first alternative must satisfy the test.
127    
128    9.  If auto-callout was enabled in a pattern with a conditional group whose
129        condition was an assertion, PCRE could crash during matching, both with
130        pcre_exec() and pcre_dfa_exec().
131    
132    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
133        used for matching.
134    
135    11. Unicode property support in character classes was not working for
136        characters (bytes) greater than 127 when not in UTF-8 mode.
137    
138    12. Added the -M command line option to pcretest.
139    
140    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
141    
142    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
143    
144    16. Added comments and documentation about mis-use of no_arg in the C++
145        wrapper.
146    
147    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
148        from Martin Jerabek that uses macro names for all relevant character and
149        string constants.
150    
151    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
152        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
153        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
154        these, but not everybody uses configure.
155    
156    19. A conditional group that had only one branch was not being correctly
157        recognized as an item that could match an empty string. This meant that an
158        enclosing group might also not be so recognized, causing infinite looping
159        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
160        with the subject "ab", where knowledge that the repeated group can match
161        nothing is needed in order to break the loop.
162    
163    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
164        exec(), but without supplying a callout function, matching went wrong.
165    
166    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
167        leak if the size of the offset vector was greater than 30. When the vector
168        is smaller, the saved offsets during recursion go onto a local stack
169        vector, but for larger vectors malloc() is used. It was failing to free
170        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
171        error, in fact).
172    
173    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
174        heapframe that is used only when UTF-8 support is enabled. This caused no
175        problem, but was untidy.
176    
177    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
178        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
179        included within another project.
180    
181    24. Steven Van Ingelgem's patches to add more options to the CMake support,
182        slightly modified by me:
183    
184          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
185              not building pcregrep.
186    
187          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
188              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
189    
190    25. Forward references, both numeric and by name, in patterns that made use of
191        duplicate group numbers, could behave incorrectly or give incorrect errors,
192        because when scanning forward to find the reference group, PCRE was not
193        taking into account the duplicate group numbers. A pattern such as
194        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
195    
196    26. Changed a few more instances of "const unsigned char *" to USPTR, making
197        the feature of a custom pointer more persuasive (as requested by a user).
198    
199    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
200        pcretest.c, inside #ifndefs, because it seems they are sometimes already
201        pre-defined.
202    
203    28. Added support for (*UTF8) at the start of a pattern.
204    
205    29. Arrange for flags added by the "release type" setting in CMake to be shown
206        in the configuration summary.
207    
208    
209    Version 7.8 05-Sep-08
210  ---------------------  ---------------------
211    
212  1.  Replaced UCP searching code with optimized version as implemented for Ad  1.  Replaced UCP searching code with optimized version as implemented for Ad
213      Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-      Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
214      stage table and inline lookup instead of a function, giving speed ups of 2      stage table and inline lookup instead of a function, giving speed ups of 2
215      to 5 times on some simple patterns that I tested. Permission was given to      to 5 times on some simple patterns that I tested. Permission was given to
216      distribute the MultiStage2.py script that generates the tables (it's not in      distribute the MultiStage2.py script that generates the tables (it's not in
217      the tarball, but is in the Subversion repository).      the tarball, but is in the Subversion repository).
218    
219    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
220        scripts.
221    
222    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
223        a group with a zero qualifier. The result of the study could be incorrect,
224        or the function might crash, depending on the pattern.
225    
226    4.  Caseless matching was not working for non-ASCII characters in back
227        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
228        It now works when Unicode Property Support is available.
229    
230    5.  In pcretest, an escape such as \x{de} in the data was always generating
231        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
232        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
233        truncation.
234    
235    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
236    
237    7.  Added two (int) casts to pcregrep when printing the difference of two
238        pointers, in case they are 64-bit values.
239    
240    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
241        test 2 if it fails.
242    
243    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
244        and a #define of that name to empty if it is not externally set. This is to
245        allow users of MSVC to set it if necessary.
246    
247    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
248        the convenience functions in the pcre_get.c source file.
249    
250    11. An option change at the start of a pattern that had top-level alternatives
251        could cause overwriting and/or a crash. This command provoked a crash in
252        some environments:
253    
254          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
255    
256        This potential security problem was recorded as CVE-2008-2371.
257    
258    12. For a pattern where the match had to start at the beginning or immediately
259        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
260        pcre_dfa_exec() could read past the end of the passed subject if there was
261        no match. To help with detecting such bugs (e.g. with valgrind), I modified
262        pcretest so that it places the subject at the end of its malloc-ed buffer.
263    
264    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
265        exec() might read past the end of the data buffer in UTF-8 mode.
266    
267    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
268        the data contained the byte 0x85 as part of a UTF-8 character within its
269        first line. This applied both to normal and DFA matching.
270    
271    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
272        /^[^d]*?$/8 failed to match "abc".
273    
274    16. Added a missing copyright notice to pcrecpp_internal.h.
275    
276    17. Make it more clear in the documentation that values returned from
277        pcre_exec() in ovector are byte offsets, not character counts.
278    
279    18. Tidied a few places to stop certain compilers from issuing warnings.
280    
281    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
282        supplied by Stefan Weber. I made a further small update for 7.8 because
283        there is a change of source arrangements: the pcre_searchfuncs.c module is
284        replaced by pcre_ucd.c.
285    
286    
287  Version 7.7 07-May-08  Version 7.7 07-May-08

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