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revision 373 by ph10, Fri Sep 5 10:25:46 2008 UTC revision 430 by ph10, Tue Sep 1 16:29:46 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.8 25-Aug-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8        was out-of-date, and there was no check on the pcre_compile() error code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. Chaos could result.
47    
48    9.  The restrictions on what a pattern can contain when partial matching is
49        requested for pcre_exec() have been removed. All patterns can now be
50        partially matched by this function. In addition, if there are at least two
51        slots in the offset vector, the offsets of the first-encountered partial
52        match are set in them when PCRE_ERROR_PARTIAL is returned.
53    
54    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
55        synonymous with PCRE_PARTIAL, for backwards compatibility, and
56        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
57        and may be more useful for multi-segment matching, especially with
58        pcre_exec().
59    
60    11. Partial matching with pcre_exec() is now more intuitive. A partial match
61        used to be given if ever the end of the subject was reached; now it is
62        given only if matching could not proceed because another character was
63        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
64        string "Z", which now yields "no match" instead of "partial match". In the
65        case of pcre_dfa_exec(), "no match" is given if every matching path for the
66        final character ended with (*FAIL).
67    
68    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
69        if the pattern had a "must contain" character that was already found in the
70        earlier partial match, unless partial matching was again requested. For
71        example, with the pattern /dog.(body)?/, the "must contain" character is
72        "g". If the first part-match was for the string "dog", restarting with
73        "sbody" failed.
74    
75    13. Added a pcredemo man page, created automatically from the pcredemo.c file,
76        so that the demonstration program is easily available in environments where
77        PCRE has not been installed from source.
78    
79    14. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
80        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
81        library.
82    
83    
84    Version 7.9 11-Apr-09
85    ---------------------
86    
87    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
88        (pcretest), all targets were linked against these libraries. This included
89        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
90        libraries. This caused unwanted dependencies to be created. This problem
91        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
92        pcretest is linked with readline.
93    
94    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
95        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
96        moved outside it again, because FALSE and TRUE are already defined in AIX,
97        but BOOL is not.
98    
99    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
100        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
101    
102    4.  The pcregrep documentation said spaces were inserted as well as colons (or
103        hyphens) following file names and line numbers when outputting matching
104        lines. This is not true; no spaces are inserted. I have also clarified the
105        wording for the --colour (or --color) option.
106    
107    5.  In pcregrep, when --colour was used with -o, the list of matching strings
108        was not coloured; this is different to GNU grep, so I have changed it to be
109        the same.
110    
111    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
112        each matching line was coloured. Now it goes on to look for further matches
113        of any of the test patterns, which is the same behaviour as GNU grep.
114    
115    7.  A pattern that could match an empty string could cause pcregrep to loop; it
116        doesn't make sense to accept an empty string match in pcregrep, so I have
117        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
118        seems to be how GNU grep behaves.
119    
120    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
121        start or after a newline", because the conditional assertion was not being
122        correctly handled. The rule now is that both the assertion and what follows
123        in the first alternative must satisfy the test.
124    
125    9.  If auto-callout was enabled in a pattern with a conditional group whose
126        condition was an assertion, PCRE could crash during matching, both with
127        pcre_exec() and pcre_dfa_exec().
128    
129    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
130        used for matching.
131    
132    11. Unicode property support in character classes was not working for
133        characters (bytes) greater than 127 when not in UTF-8 mode.
134    
135    12. Added the -M command line option to pcretest.
136    
137    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
138    
139    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
140    
141    16. Added comments and documentation about mis-use of no_arg in the C++
142        wrapper.
143    
144    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
145        from Martin Jerabek that uses macro names for all relevant character and
146        string constants.
147    
148    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
149        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
150        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
151        these, but not everybody uses configure.
152    
153    19. A conditional group that had only one branch was not being correctly
154        recognized as an item that could match an empty string. This meant that an
155        enclosing group might also not be so recognized, causing infinite looping
156        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
157        with the subject "ab", where knowledge that the repeated group can match
158        nothing is needed in order to break the loop.
159    
160    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
161        exec(), but without supplying a callout function, matching went wrong.
162    
163    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
164        leak if the size of the offset vector was greater than 30. When the vector
165        is smaller, the saved offsets during recursion go onto a local stack
166        vector, but for larger vectors malloc() is used. It was failing to free
167        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
168        error, in fact).
169    
170    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
171        heapframe that is used only when UTF-8 support is enabled. This caused no
172        problem, but was untidy.
173    
174    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
175        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
176        included within another project.
177    
178    24. Steven Van Ingelgem's patches to add more options to the CMake support,
179        slightly modified by me:
180    
181          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
182              not building pcregrep.
183    
184          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
185              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
186    
187    25. Forward references, both numeric and by name, in patterns that made use of
188        duplicate group numbers, could behave incorrectly or give incorrect errors,
189        because when scanning forward to find the reference group, PCRE was not
190        taking into account the duplicate group numbers. A pattern such as
191        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
192    
193    26. Changed a few more instances of "const unsigned char *" to USPTR, making
194        the feature of a custom pointer more persuasive (as requested by a user).
195    
196    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
197        pcretest.c, inside #ifndefs, because it seems they are sometimes already
198        pre-defined.
199    
200    28. Added support for (*UTF8) at the start of a pattern.
201    
202    29. Arrange for flags added by the "release type" setting in CMake to be shown
203        in the configuration summary.
204    
205    
206    Version 7.8 05-Sep-08
207  ---------------------  ---------------------
208    
209  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 75  Version 7.8 25-Aug-08 Line 277  Version 7.8 25-Aug-08
277    
278  19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as  19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
279      supplied by Stefan Weber. I made a further small update for 7.8 because      supplied by Stefan Weber. I made a further small update for 7.8 because
280      there is a change of source arrangements: the pcre_searchfuncs.c module is      there is a change of source arrangements: the pcre_searchfuncs.c module is
281      replaced by pcre_ucd.c.      replaced by pcre_ucd.c.
282    
283    
284  Version 7.7 07-May-08  Version 7.7 07-May-08

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