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revision 253 by ph10, Mon Sep 17 10:51:30 2007 UTC revision 368 by ph10, Sun Aug 24 16:25:20 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.4 10-Sep-07  Version 7.8 25-Aug-08
5    ---------------------
6    
7    1.  Replaced UCP searching code with optimized version as implemented for Ad
8        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
9        stage table and inline lookup instead of a function, giving speed ups of 2
10        to 5 times on some simple patterns that I tested. Permission was given to
11        distribute the MultiStage2.py script that generates the tables (it's not in
12        the tarball, but is in the Subversion repository).
13    
14    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
15        scripts.
16    
17    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
18        a group with a zero qualifier. The result of the study could be incorrect,
19        or the function might crash, depending on the pattern.
20    
21    4.  Caseless matching was not working for non-ASCII characters in back
22        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
23        It now works when Unicode Property Support is available.
24    
25    5.  In pcretest, an escape such as \x{de} in the data was always generating
26        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
27        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
28        truncation.
29    
30    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
31    
32    7.  Added two (int) casts to pcregrep when printing the difference of two
33        pointers, in case they are 64-bit values.
34    
35    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
36        test 2 if it fails.
37    
38    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
39        and a #define of that name to empty if it is not externally set. This is to
40        allow users of MSVC to set it if necessary.
41    
42    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
43        the convenience functions in the pcre_get.c source file.
44    
45    11. An option change at the start of a pattern that had top-level alternatives
46        could cause overwriting and/or a crash. This command provoked a crash in
47        some environments:
48    
49          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
50    
51        This potential security problem was recorded as CVE-2008-2371.
52    
53    12. For a pattern where the match had to start at the beginning or immediately
54        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
55        pcre_dfa_exec() could read past the end of the passed subject if there was
56        no match. To help with detecting such bugs (e.g. with valgrind), I modified
57        pcretest so that it places the subject at the end of its malloc-ed buffer.
58    
59    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
60        exec() might read past the end of the data buffer in UTF-8 mode.
61    
62    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
63        the data contained the byte 0x85 as part of a UTF-8 character within its
64        first line. This applied both to normal and DFA matching.
65    
66    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
67        /^[^d]*?$/8 failed to match "abc".
68    
69    16. Added a missing copyright notice to pcrecpp_internal.h.
70    
71    17. Make it more clear in the documentation that values returned from
72        pcre_exec() in ovector are byte offsets, not character counts.
73    
74    
75    Version 7.7 07-May-08
76    ---------------------
77    
78    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
79        a string to a long long, pretend we don't even have a long long." This is
80        done by checking for the strtoq, strtoll, and _strtoi64 functions.
81    
82    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
83        pre-7.6 versions, which defined a global no_arg variable instead of putting
84        it in the RE class. (See also #8 below.)
85    
86    3.  Remove a line of dead code, identified by coverity and reported by Nuno
87        Lopes.
88    
89    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
90    
91        (1) The include/exclude patterns were being applied to the whole pathnames
92            of files, instead of just to the final components.
93    
94        (2) If there was more than one level of directory, the subdirectories were
95            skipped unless they satisfied the include/exclude conditions. This is
96            inconsistent with GNU grep (and could even be seen as contrary to the
97            pcregrep specification - which I improved to make it absolutely clear).
98            The action now is always to scan all levels of directory, and just
99            apply the include/exclude patterns to regular files.
100    
101    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
102        --exclude_dir in the tests to avoid scanning .svn directories.
103    
104    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
105        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
106        doesn't support NULs in patterns.
107    
108    7.  Added some missing "const"s to declarations of static tables in
109        pcre_compile.c and pcre_dfa_exec.c.
110    
111    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
112        caused by fix #2  above. (Subsequently also a second patch to fix the
113        first patch. And a third patch - this was a messy problem.)
114    
115    9.  Applied Craig's patch to remove the use of push_back().
116    
117    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
118        matching function regexec().
119    
120    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
121        which, however, unlike Perl's \g{...}, are subroutine calls, not back
122        references. PCRE supports relative numbers with this syntax (I don't think
123        Oniguruma does).
124    
125    12. Previously, a group with a zero repeat such as (...){0} was completely
126        omitted from the compiled regex. However, this means that if the group
127        was called as a subroutine from elsewhere in the pattern, things went wrong
128        (an internal error was given). Such groups are now left in the compiled
129        pattern, with a new opcode that causes them to be skipped at execution
130        time.
131    
132    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
133        to the way PCRE behaves:
134    
135        (a) A lone ] character is dis-allowed (Perl treats it as data).
136    
137        (b) A back reference to an unmatched subpattern matches an empty string
138            (Perl fails the current match path).
139    
140        (c) A data ] in a character class must be notated as \] because if the
141            first data character in a class is ], it defines an empty class. (In
142            Perl it is not possible to have an empty class.) The empty class []
143            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
144            The negative empty class [^] matches any one character, independently
145            of the DOTALL setting.
146    
147    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
148        non-existent subpattern following a character class starting with ']' and
149        containing () gave an internal compiling error instead of "reference to
150        non-existent subpattern". Fortunately, when the pattern did exist, the
151        compiled code was correct. (When scanning forwards to check for the
152        existencd of the subpattern, it was treating the data ']' as terminating
153        the class, so got the count wrong. When actually compiling, the reference
154        was subsequently set up correctly.)
155    
156    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
157        it was being rejected as not supported by pcre_dfa_exec(), even though
158        other assertions are supported. I have made pcre_dfa_exec() support
159        (*FAIL).
160    
161    16. The implementation of 13c above involved the invention of a new opcode,
162        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
163        cannot be changed at match time, I realized I could make a small
164        improvement to matching performance by compiling OP_ALLANY instead of
165        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
166        on the OP_ANY path.
167    
168    17. Compiling pcretest on Windows with readline support failed without the
169        following two fixes: (1) Make the unistd.h include conditional on
170        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
171    
172    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
173        ncurses library to be included for pcretest when ReadLine support is
174        requested, but also to allow for it to be overridden. This patch came from
175        Daniel Bergström.
176    
177    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
178        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
179        any errors with the current Unicode tables. Thanks to Peter Kankowski for
180        spotting this.
181    
182    
183    Version 7.6 28-Jan-08
184    ---------------------
185    
186    1.  A character class containing a very large number of characters with
187        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
188        overflow.
189    
190    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
191        HAVE_LONG_LONG is not defined.
192    
193    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
194        bring them up to date and include new features. This patch includes:
195    
196        - Fixed PH's badly added libz and libbz2 support.
197        - Fixed a problem with static linking.
198        - Added pcredemo. [But later removed - see 7 below.]
199        - Fixed dftables problem and added an option.
200        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
201            HAVE_LONG_LONG.
202        - Added readline support for pcretest.
203        - Added an listing of the option settings after cmake has run.
204    
205    4.  A user submitted a patch to Makefile that makes it easy to create
206        "pcre.dll" under mingw when using Configure/Make. I added stuff to
207        Makefile.am that cause it to include this special target, without
208        affecting anything else. Note that the same mingw target plus all
209        the other distribution libraries and programs are now supported
210        when configuring with CMake (see 6 below) instead of with
211        Configure/Make.
212    
213    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
214        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
215        exported in the Windows port". It has not yet been confirmed that the patch
216        solves the problem, but it does no harm.
217    
218    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
219        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
220        with CMake, and also correct the comment about stack recursion.
221    
222    7.  Remove the automatic building of pcredemo from the ./configure system and
223        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
224        of a program that users should build themselves after PCRE is installed, so
225        building it automatically is not really right. What is more, it gave
226        trouble in some build environments.
227    
228    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
229    
230    
231    Version 7.5 10-Jan-08
232    ---------------------
233    
234    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
235        values in parens when parsing an RE using the C++ wrapper."
236    
237    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
238        Characters greater than 255 were excluded from the class instead of being
239        included.
240    
241    3.  The same bug as (2) above applied to negated POSIX classes such as
242        [:^space:].
243    
244    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
245        defined or documented. It seems to have been a typo for PCRE_STATIC, so
246        I have changed it.
247    
248    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
249        first named subpattern) and a construct such as (?&a) would reference the
250        first named subpattern whose name started with "a" (in other words, the
251        length check was missing). Both these problems are fixed. "Subpattern name
252        expected" is now given for (?&) (a zero-length name), and this patch also
253        makes it give the same error for \k'' (previously it complained that that
254        was a reference to a non-existent subpattern).
255    
256    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
257        this is right because (?- can be followed by option settings as well as by
258        digits. I have, however, made the messages clearer.
259    
260    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
261        than the number used in the conditional) now cause a compile-time error.
262        This is actually not compatible with Perl, which accepts such patterns, but
263        treats the conditional as always being FALSE (as PCRE used to), but it
264        seems to me that giving a diagnostic is better.
265    
266    8.  Change "alphameric" to the more common word "alphanumeric" in comments
267        and messages.
268    
269    9.  Fix two occurrences of "backslash" in comments that should have been
270        "backspace".
271    
272    10. Remove two redundant lines of code that can never be obeyed (their function
273        was moved elsewhere).
274    
275    11. The program that makes PCRE's Unicode character property table had a bug
276        which caused it to generate incorrect table entries for sequences of
277        characters that have the same character type, but are in different scripts.
278        It amalgamated them into a single range, with the script of the first of
279        them. In other words, some characters were in the wrong script. There were
280        thirteen such cases, affecting characters in the following ranges:
281    
282          U+002b0 - U+002c1
283          U+0060c - U+0060d
284          U+0061e - U+00612
285          U+0064b - U+0065e
286          U+0074d - U+0076d
287          U+01800 - U+01805
288          U+01d00 - U+01d77
289          U+01d9b - U+01dbf
290          U+0200b - U+0200f
291          U+030fc - U+030fe
292          U+03260 - U+0327f
293          U+0fb46 - U+0fbb1
294          U+10450 - U+1049d
295    
296    12. The -o option (show only the matching part of a line) for pcregrep was not
297        compatible with GNU grep in that, if there was more than one match in a
298        line, it showed only the first of them. It now behaves in the same way as
299        GNU grep.
300    
301    13. If the -o and -v options were combined for pcregrep, it printed a blank
302        line for every non-matching line. GNU grep prints nothing, and pcregrep now
303        does the same. The return code can be used to tell if there were any
304        non-matching lines.
305    
306    14. Added --file-offsets and --line-offsets to pcregrep.
307    
308    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
309        infinitely looping recursion. The bug was that positive lookaheads were not
310        being skipped when checking for a possible empty match (negative lookaheads
311        and both kinds of lookbehind were skipped).
312    
313    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
314        inclusion of <windows.h> to before rather than after the definition of
315        INVALID_FILE_ATTRIBUTES (patch from David Byron).
316    
317    17. Specifying a possessive quantifier with a specific limit for a Unicode
318        character property caused pcre_compile() to compile bad code, which led at
319        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
320        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
321        caused the error; without that there was no problem.
322    
323    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
324    
325    19. Added --enable-pcretest-libreadline.
326    
327    20. In pcrecpp.cc, the variable 'count' was incremented twice in
328        RE::GlobalReplace(). As a result, the number of replacements returned was
329        double what it should be. I removed one of the increments, but Craig sent a
330        later patch that removed the other one (the right fix) and added unit tests
331        that check the return values (which was not done before).
332    
333    21. Several CMake things:
334    
335        (1) Arranged that, when cmake is used on Unix, the libraries end up with
336            the names libpcre and libpcreposix, not just pcre and pcreposix.
337    
338        (2) The above change means that pcretest and pcregrep are now correctly
339            linked with the newly-built libraries, not previously installed ones.
340    
341        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
342    
343    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
344        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
345        UTF-8 newline character). The key issue is that the pattern starts .*;
346        this means that the match must be either at the beginning, or after a
347        newline. The bug was in the code for advancing after a failed match and
348        checking that the new position followed a newline. It was not taking
349        account of UTF-8 characters correctly.
350    
351    23. PCRE was behaving differently from Perl in the way it recognized POSIX
352        character classes. PCRE was not treating the sequence [:...:] as a
353        character class unless the ... were all letters. Perl, however, seems to
354        allow any characters between [: and :], though of course it rejects as
355        unknown any "names" that contain non-letters, because all the known class
356        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
357        for example, whereas PCRE did not - it did not recognize a POSIX character
358        class. This seemed a bit dangerous, so the code has been changed to be
359        closer to Perl. The behaviour is not identical to Perl, because PCRE will
360        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
361        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
362        Perl does, and where it didn't before.
363    
364    24. Rewrite so as to remove the single use of %n from pcregrep because in some
365        Windows environments %n is disabled by default.
366    
367    
368    Version 7.4 21-Sep-07
369  ---------------------  ---------------------
370    
371  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
# Line 32  Version 7.4 10-Sep-07 Line 396  Version 7.4 10-Sep-07
396      compatibility, even though it is no longer used.      compatibility, even though it is no longer used.
397    
398  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
399      strtoull to pcrecpp.cc to select the available functions in WIN32 when the      strtoull to pcrecpp.cc to select the available functions in WIN32 when the
400      windows.h file is present (where different names are used).      windows.h file is present (where different names are used). [This was
401        reversed later after testing - see 16 below.]
402    
403  8.  Changed all #include <config.h> to #include "config.h". There were also  8.  Changed all #include <config.h> to #include "config.h". There were also
404      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
# Line 63  Version 7.4 10-Sep-07 Line 428  Version 7.4 10-Sep-07
428  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
429      checked only for CRLF.      checked only for CRLF.
430    
431    14. Added casts to pcretest.c to avoid compiler warnings.
432    
433    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
434    
435    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
436        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
437        entirely. This removes changes made in 7 above.
438    
439    17. The CMake files have been updated, and there is now more information about
440        building with CMake in the NON-UNIX-USE document.
441    
442    
443  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
444  ---------------------  ---------------------

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