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revision 346 by ph10, Wed Apr 30 16:35:49 2008 UTC revision 396 by ph10, Fri Mar 20 11:23:20 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.7 28-Apr-08  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, PCRE
46        could crash during matching.
47    
48    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
49        used for matching.
50    
51    11. Unicode property support in character classes was not working for
52        characters (bytes) greater than 127 when not in UTF-8 mode.
53    
54    12. Added the -M command line option to pcretest.
55    
56    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
57    
58    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
59    
60    16. Added comments and documentation about mis-use of no_arg in the C++
61        wrapper.
62    
63    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
64        from Martin Jerabek that uses macro names for all relevant character and
65        string constants.
66    
67    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
68        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
69        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
70        these, but not everybody uses configure.
71    
72    19. A conditional group that had only one branch was not being correctly
73        recognized as an item that could match an empty string. This meant that an
74        enclosing group might also not be so recognized, causing infinite looping
75        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
76        with the subject "ab", where knowledge that the repeated group can match
77        nothing is needed in order to break the loop.
78    
79    
80    Version 7.8 05-Sep-08
81    ---------------------
82    
83    1.  Replaced UCP searching code with optimized version as implemented for Ad
84        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
85        stage table and inline lookup instead of a function, giving speed ups of 2
86        to 5 times on some simple patterns that I tested. Permission was given to
87        distribute the MultiStage2.py script that generates the tables (it's not in
88        the tarball, but is in the Subversion repository).
89    
90    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
91        scripts.
92    
93    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
94        a group with a zero qualifier. The result of the study could be incorrect,
95        or the function might crash, depending on the pattern.
96    
97    4.  Caseless matching was not working for non-ASCII characters in back
98        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
99        It now works when Unicode Property Support is available.
100    
101    5.  In pcretest, an escape such as \x{de} in the data was always generating
102        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
103        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
104        truncation.
105    
106    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
107    
108    7.  Added two (int) casts to pcregrep when printing the difference of two
109        pointers, in case they are 64-bit values.
110    
111    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
112        test 2 if it fails.
113    
114    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
115        and a #define of that name to empty if it is not externally set. This is to
116        allow users of MSVC to set it if necessary.
117    
118    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
119        the convenience functions in the pcre_get.c source file.
120    
121    11. An option change at the start of a pattern that had top-level alternatives
122        could cause overwriting and/or a crash. This command provoked a crash in
123        some environments:
124    
125          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
126    
127        This potential security problem was recorded as CVE-2008-2371.
128    
129    12. For a pattern where the match had to start at the beginning or immediately
130        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
131        pcre_dfa_exec() could read past the end of the passed subject if there was
132        no match. To help with detecting such bugs (e.g. with valgrind), I modified
133        pcretest so that it places the subject at the end of its malloc-ed buffer.
134    
135    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
136        exec() might read past the end of the data buffer in UTF-8 mode.
137    
138    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
139        the data contained the byte 0x85 as part of a UTF-8 character within its
140        first line. This applied both to normal and DFA matching.
141    
142    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
143        /^[^d]*?$/8 failed to match "abc".
144    
145    16. Added a missing copyright notice to pcrecpp_internal.h.
146    
147    17. Make it more clear in the documentation that values returned from
148        pcre_exec() in ovector are byte offsets, not character counts.
149    
150    18. Tidied a few places to stop certain compilers from issuing warnings.
151    
152    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
153        supplied by Stefan Weber. I made a further small update for 7.8 because
154        there is a change of source arrangements: the pcre_searchfuncs.c module is
155        replaced by pcre_ucd.c.
156    
157    
158    Version 7.7 07-May-08
159  ---------------------  ---------------------
160    
161  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
# Line 102  Version 7.7 28-Apr-08 Line 256  Version 7.7 28-Apr-08
256      ncurses library to be included for pcretest when ReadLine support is      ncurses library to be included for pcretest when ReadLine support is
257      requested, but also to allow for it to be overridden. This patch came from      requested, but also to allow for it to be overridden. This patch came from
258      Daniel Bergström.      Daniel Bergström.
259    
260  19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined  19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
261      as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused      as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
262      any errors with the current Unicode tables. Thanks to Peter Kankowski for      any errors with the current Unicode tables. Thanks to Peter Kankowski for
263      spotting this.      spotting this.
264    
265    
266  Version 7.6 28-Jan-08  Version 7.6 28-Jan-08

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