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revision 314 by ph10, Fri Jan 25 17:09:21 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 7.6 21-Jan-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
162        a string to a long long, pretend we don't even have a long long." This is
163        done by checking for the strtoq, strtoll, and _strtoi64 functions.
164    
165    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
166        pre-7.6 versions, which defined a global no_arg variable instead of putting
167        it in the RE class. (See also #8 below.)
168    
169    3.  Remove a line of dead code, identified by coverity and reported by Nuno
170        Lopes.
171    
172    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
173    
174        (1) The include/exclude patterns were being applied to the whole pathnames
175            of files, instead of just to the final components.
176    
177        (2) If there was more than one level of directory, the subdirectories were
178            skipped unless they satisfied the include/exclude conditions. This is
179            inconsistent with GNU grep (and could even be seen as contrary to the
180            pcregrep specification - which I improved to make it absolutely clear).
181            The action now is always to scan all levels of directory, and just
182            apply the include/exclude patterns to regular files.
183    
184    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
185        --exclude_dir in the tests to avoid scanning .svn directories.
186    
187    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
188        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
189        doesn't support NULs in patterns.
190    
191    7.  Added some missing "const"s to declarations of static tables in
192        pcre_compile.c and pcre_dfa_exec.c.
193    
194    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
195        caused by fix #2  above. (Subsequently also a second patch to fix the
196        first patch. And a third patch - this was a messy problem.)
197    
198    9.  Applied Craig's patch to remove the use of push_back().
199    
200    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
201        matching function regexec().
202    
203    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
204        which, however, unlike Perl's \g{...}, are subroutine calls, not back
205        references. PCRE supports relative numbers with this syntax (I don't think
206        Oniguruma does).
207    
208    12. Previously, a group with a zero repeat such as (...){0} was completely
209        omitted from the compiled regex. However, this means that if the group
210        was called as a subroutine from elsewhere in the pattern, things went wrong
211        (an internal error was given). Such groups are now left in the compiled
212        pattern, with a new opcode that causes them to be skipped at execution
213        time.
214    
215    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
216        to the way PCRE behaves:
217    
218        (a) A lone ] character is dis-allowed (Perl treats it as data).
219    
220        (b) A back reference to an unmatched subpattern matches an empty string
221            (Perl fails the current match path).
222    
223        (c) A data ] in a character class must be notated as \] because if the
224            first data character in a class is ], it defines an empty class. (In
225            Perl it is not possible to have an empty class.) The empty class []
226            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
227            The negative empty class [^] matches any one character, independently
228            of the DOTALL setting.
229    
230    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
231        non-existent subpattern following a character class starting with ']' and
232        containing () gave an internal compiling error instead of "reference to
233        non-existent subpattern". Fortunately, when the pattern did exist, the
234        compiled code was correct. (When scanning forwards to check for the
235        existencd of the subpattern, it was treating the data ']' as terminating
236        the class, so got the count wrong. When actually compiling, the reference
237        was subsequently set up correctly.)
238    
239    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
240        it was being rejected as not supported by pcre_dfa_exec(), even though
241        other assertions are supported. I have made pcre_dfa_exec() support
242        (*FAIL).
243    
244    16. The implementation of 13c above involved the invention of a new opcode,
245        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
246        cannot be changed at match time, I realized I could make a small
247        improvement to matching performance by compiling OP_ALLANY instead of
248        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
249        on the OP_ANY path.
250    
251    17. Compiling pcretest on Windows with readline support failed without the
252        following two fixes: (1) Make the unistd.h include conditional on
253        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
254    
255    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
256        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
258        Daniel Bergström.
259    
260    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
262        any errors with the current Unicode tables. Thanks to Peter Kankowski for
263        spotting this.
264    
265    
266    Version 7.6 28-Jan-08
267  ---------------------  ---------------------
268    
269  1.  A character class containing a very large number of characters with  1.  A character class containing a very large number of characters with
# Line 37  Version 7.6 21-Jan-08 Line 299  Version 7.6 21-Jan-08
299      solves the problem, but it does no harm.      solves the problem, but it does no harm.
300    
301  6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and  6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
302      NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured      NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
303      with CMake, and also correct the comment about stack recursion.      with CMake, and also correct the comment about stack recursion.
304    
305  7.  Remove the automatic building of pcredemo from the ./configure system and  7.  Remove the automatic building of pcredemo from the ./configure system and
# Line 46  Version 7.6 21-Jan-08 Line 308  Version 7.6 21-Jan-08
308      building it automatically is not really right. What is more, it gave      building it automatically is not really right. What is more, it gave
309      trouble in some build environments.      trouble in some build environments.
310    
311    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
312    
313    
314  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
315  ---------------------  ---------------------

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