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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.6 14-Jan-08  Version 7.9 xx-xxx-09
5  ---------------------  ---------------------
6    
7  1.  A class with a very large number of characters with codepoints greater  1.  When building with support for bzlib/zlib (pcregrep) and/or readline
8      than 255 (in UTF-8 mode, of course), caused a buffer overflow.      (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    
41    Version 7.8 05-Sep-08
42    ---------------------
43    
44    1.  Replaced UCP searching code with optimized version as implemented for Ad
45        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
46        stage table and inline lookup instead of a function, giving speed ups of 2
47        to 5 times on some simple patterns that I tested. Permission was given to
48        distribute the MultiStage2.py script that generates the tables (it's not in
49        the tarball, but is in the Subversion repository).
50    
51    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
52        scripts.
53    
54    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
55        a group with a zero qualifier. The result of the study could be incorrect,
56        or the function might crash, depending on the pattern.
57    
58    4.  Caseless matching was not working for non-ASCII characters in back
59        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
60        It now works when Unicode Property Support is available.
61    
62    5.  In pcretest, an escape such as \x{de} in the data was always generating
63        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
64        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
65        truncation.
66    
67    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
68    
69    7.  Added two (int) casts to pcregrep when printing the difference of two
70        pointers, in case they are 64-bit values.
71    
72    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
73        test 2 if it fails.
74    
75    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
76        and a #define of that name to empty if it is not externally set. This is to
77        allow users of MSVC to set it if necessary.
78    
79    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
80        the convenience functions in the pcre_get.c source file.
81    
82    11. An option change at the start of a pattern that had top-level alternatives
83        could cause overwriting and/or a crash. This command provoked a crash in
84        some environments:
85    
86          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
87    
88        This potential security problem was recorded as CVE-2008-2371.
89    
90    12. For a pattern where the match had to start at the beginning or immediately
91        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
92        pcre_dfa_exec() could read past the end of the passed subject if there was
93        no match. To help with detecting such bugs (e.g. with valgrind), I modified
94        pcretest so that it places the subject at the end of its malloc-ed buffer.
95    
96    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
97        exec() might read past the end of the data buffer in UTF-8 mode.
98    
99    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
100        the data contained the byte 0x85 as part of a UTF-8 character within its
101        first line. This applied both to normal and DFA matching.
102    
103    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
104        /^[^d]*?$/8 failed to match "abc".
105    
106    16. Added a missing copyright notice to pcrecpp_internal.h.
107    
108    17. Make it more clear in the documentation that values returned from
109        pcre_exec() in ovector are byte offsets, not character counts.
110    
111    18. Tidied a few places to stop certain compilers from issuing warnings.
112    
113    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
114        supplied by Stefan Weber. I made a further small update for 7.8 because
115        there is a change of source arrangements: the pcre_searchfuncs.c module is
116        replaced by pcre_ucd.c.
117    
118    
119    Version 7.7 07-May-08
120    ---------------------
121    
122    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
123        a string to a long long, pretend we don't even have a long long." This is
124        done by checking for the strtoq, strtoll, and _strtoi64 functions.
125    
126    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
127        pre-7.6 versions, which defined a global no_arg variable instead of putting
128        it in the RE class. (See also #8 below.)
129    
130    3.  Remove a line of dead code, identified by coverity and reported by Nuno
131        Lopes.
132    
133    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
134    
135        (1) The include/exclude patterns were being applied to the whole pathnames
136            of files, instead of just to the final components.
137    
138        (2) If there was more than one level of directory, the subdirectories were
139            skipped unless they satisfied the include/exclude conditions. This is
140            inconsistent with GNU grep (and could even be seen as contrary to the
141            pcregrep specification - which I improved to make it absolutely clear).
142            The action now is always to scan all levels of directory, and just
143            apply the include/exclude patterns to regular files.
144    
145    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
146        --exclude_dir in the tests to avoid scanning .svn directories.
147    
148    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
149        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
150        doesn't support NULs in patterns.
151    
152    7.  Added some missing "const"s to declarations of static tables in
153        pcre_compile.c and pcre_dfa_exec.c.
154    
155    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
156        caused by fix #2  above. (Subsequently also a second patch to fix the
157        first patch. And a third patch - this was a messy problem.)
158    
159    9.  Applied Craig's patch to remove the use of push_back().
160    
161    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
162        matching function regexec().
163    
164    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
165        which, however, unlike Perl's \g{...}, are subroutine calls, not back
166        references. PCRE supports relative numbers with this syntax (I don't think
167        Oniguruma does).
168    
169    12. Previously, a group with a zero repeat such as (...){0} was completely
170        omitted from the compiled regex. However, this means that if the group
171        was called as a subroutine from elsewhere in the pattern, things went wrong
172        (an internal error was given). Such groups are now left in the compiled
173        pattern, with a new opcode that causes them to be skipped at execution
174        time.
175    
176    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
177        to the way PCRE behaves:
178    
179        (a) A lone ] character is dis-allowed (Perl treats it as data).
180    
181        (b) A back reference to an unmatched subpattern matches an empty string
182            (Perl fails the current match path).
183    
184        (c) A data ] in a character class must be notated as \] because if the
185            first data character in a class is ], it defines an empty class. (In
186            Perl it is not possible to have an empty class.) The empty class []
187            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
188            The negative empty class [^] matches any one character, independently
189            of the DOTALL setting.
190    
191    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
192        non-existent subpattern following a character class starting with ']' and
193        containing () gave an internal compiling error instead of "reference to
194        non-existent subpattern". Fortunately, when the pattern did exist, the
195        compiled code was correct. (When scanning forwards to check for the
196        existencd of the subpattern, it was treating the data ']' as terminating
197        the class, so got the count wrong. When actually compiling, the reference
198        was subsequently set up correctly.)
199    
200    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
201        it was being rejected as not supported by pcre_dfa_exec(), even though
202        other assertions are supported. I have made pcre_dfa_exec() support
203        (*FAIL).
204    
205    16. The implementation of 13c above involved the invention of a new opcode,
206        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
207        cannot be changed at match time, I realized I could make a small
208        improvement to matching performance by compiling OP_ALLANY instead of
209        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
210        on the OP_ANY path.
211    
212    17. Compiling pcretest on Windows with readline support failed without the
213        following two fixes: (1) Make the unistd.h include conditional on
214        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
215    
216    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
217        ncurses library to be included for pcretest when ReadLine support is
218        requested, but also to allow for it to be overridden. This patch came from
219        Daniel Bergström.
220    
221    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
222        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
223        any errors with the current Unicode tables. Thanks to Peter Kankowski for
224        spotting this.
225    
226    
227    Version 7.6 28-Jan-08
228    ---------------------
229    
230    1.  A character class containing a very large number of characters with
231        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
232        overflow.
233    
234    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
235        HAVE_LONG_LONG is not defined.
236    
237    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
238        bring them up to date and include new features. This patch includes:
239    
240        - Fixed PH's badly added libz and libbz2 support.
241        - Fixed a problem with static linking.
242        - Added pcredemo. [But later removed - see 7 below.]
243        - Fixed dftables problem and added an option.
244        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
245            HAVE_LONG_LONG.
246        - Added readline support for pcretest.
247        - Added an listing of the option settings after cmake has run.
248    
249    4.  A user submitted a patch to Makefile that makes it easy to create
250        "pcre.dll" under mingw when using Configure/Make. I added stuff to
251        Makefile.am that cause it to include this special target, without
252        affecting anything else. Note that the same mingw target plus all
253        the other distribution libraries and programs are now supported
254        when configuring with CMake (see 6 below) instead of with
255        Configure/Make.
256    
257    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
258        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
259        exported in the Windows port". It has not yet been confirmed that the patch
260        solves the problem, but it does no harm.
261    
262    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
263        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
264        with CMake, and also correct the comment about stack recursion.
265    
266    7.  Remove the automatic building of pcredemo from the ./configure system and
267        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
268        of a program that users should build themselves after PCRE is installed, so
269        building it automatically is not really right. What is more, it gave
270        trouble in some build environments.
271    
272    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
273    
274    
275  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
276  ---------------------  ---------------------

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