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revision 257 by ph10, Wed Sep 19 09:11:19 2007 UTC revision 364 by ph10, Fri Jul 11 14:53:41 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.4 10-Sep-07  Version 8.0 02 Jul-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.
65    
66    
67    Version 7.7 07-May-08
68    ---------------------
69    
70    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
71        a string to a long long, pretend we don't even have a long long." This is
72        done by checking for the strtoq, strtoll, and _strtoi64 functions.
73    
74    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
75        pre-7.6 versions, which defined a global no_arg variable instead of putting
76        it in the RE class. (See also #8 below.)
77    
78    3.  Remove a line of dead code, identified by coverity and reported by Nuno
79        Lopes.
80    
81    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
82    
83        (1) The include/exclude patterns were being applied to the whole pathnames
84            of files, instead of just to the final components.
85    
86        (2) If there was more than one level of directory, the subdirectories were
87            skipped unless they satisfied the include/exclude conditions. This is
88            inconsistent with GNU grep (and could even be seen as contrary to the
89            pcregrep specification - which I improved to make it absolutely clear).
90            The action now is always to scan all levels of directory, and just
91            apply the include/exclude patterns to regular files.
92    
93    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
94        --exclude_dir in the tests to avoid scanning .svn directories.
95    
96    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
97        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
98        doesn't support NULs in patterns.
99    
100    7.  Added some missing "const"s to declarations of static tables in
101        pcre_compile.c and pcre_dfa_exec.c.
102    
103    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
104        caused by fix #2  above. (Subsequently also a second patch to fix the
105        first patch. And a third patch - this was a messy problem.)
106    
107    9.  Applied Craig's patch to remove the use of push_back().
108    
109    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
110        matching function regexec().
111    
112    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
113        which, however, unlike Perl's \g{...}, are subroutine calls, not back
114        references. PCRE supports relative numbers with this syntax (I don't think
115        Oniguruma does).
116    
117    12. Previously, a group with a zero repeat such as (...){0} was completely
118        omitted from the compiled regex. However, this means that if the group
119        was called as a subroutine from elsewhere in the pattern, things went wrong
120        (an internal error was given). Such groups are now left in the compiled
121        pattern, with a new opcode that causes them to be skipped at execution
122        time.
123    
124    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
125        to the way PCRE behaves:
126    
127        (a) A lone ] character is dis-allowed (Perl treats it as data).
128    
129        (b) A back reference to an unmatched subpattern matches an empty string
130            (Perl fails the current match path).
131    
132        (c) A data ] in a character class must be notated as \] because if the
133            first data character in a class is ], it defines an empty class. (In
134            Perl it is not possible to have an empty class.) The empty class []
135            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
136            The negative empty class [^] matches any one character, independently
137            of the DOTALL setting.
138    
139    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
140        non-existent subpattern following a character class starting with ']' and
141        containing () gave an internal compiling error instead of "reference to
142        non-existent subpattern". Fortunately, when the pattern did exist, the
143        compiled code was correct. (When scanning forwards to check for the
144        existencd of the subpattern, it was treating the data ']' as terminating
145        the class, so got the count wrong. When actually compiling, the reference
146        was subsequently set up correctly.)
147    
148    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
149        it was being rejected as not supported by pcre_dfa_exec(), even though
150        other assertions are supported. I have made pcre_dfa_exec() support
151        (*FAIL).
152    
153    16. The implementation of 13c above involved the invention of a new opcode,
154        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
155        cannot be changed at match time, I realized I could make a small
156        improvement to matching performance by compiling OP_ALLANY instead of
157        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
158        on the OP_ANY path.
159    
160    17. Compiling pcretest on Windows with readline support failed without the
161        following two fixes: (1) Make the unistd.h include conditional on
162        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
163    
164    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
165        ncurses library to be included for pcretest when ReadLine support is
166        requested, but also to allow for it to be overridden. This patch came from
167        Daniel Bergström.
168    
169    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
170        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
171        any errors with the current Unicode tables. Thanks to Peter Kankowski for
172        spotting this.
173    
174    
175    Version 7.6 28-Jan-08
176    ---------------------
177    
178    1.  A character class containing a very large number of characters with
179        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
180        overflow.
181    
182    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
183        HAVE_LONG_LONG is not defined.
184    
185    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
186        bring them up to date and include new features. This patch includes:
187    
188        - Fixed PH's badly added libz and libbz2 support.
189        - Fixed a problem with static linking.
190        - Added pcredemo. [But later removed - see 7 below.]
191        - Fixed dftables problem and added an option.
192        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
193            HAVE_LONG_LONG.
194        - Added readline support for pcretest.
195        - Added an listing of the option settings after cmake has run.
196    
197    4.  A user submitted a patch to Makefile that makes it easy to create
198        "pcre.dll" under mingw when using Configure/Make. I added stuff to
199        Makefile.am that cause it to include this special target, without
200        affecting anything else. Note that the same mingw target plus all
201        the other distribution libraries and programs are now supported
202        when configuring with CMake (see 6 below) instead of with
203        Configure/Make.
204    
205    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
206        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
207        exported in the Windows port". It has not yet been confirmed that the patch
208        solves the problem, but it does no harm.
209    
210    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
211        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
212        with CMake, and also correct the comment about stack recursion.
213    
214    7.  Remove the automatic building of pcredemo from the ./configure system and
215        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
216        of a program that users should build themselves after PCRE is installed, so
217        building it automatically is not really right. What is more, it gave
218        trouble in some build environments.
219    
220    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
221    
222    
223    Version 7.5 10-Jan-08
224    ---------------------
225    
226    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
227        values in parens when parsing an RE using the C++ wrapper."
228    
229    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
230        Characters greater than 255 were excluded from the class instead of being
231        included.
232    
233    3.  The same bug as (2) above applied to negated POSIX classes such as
234        [:^space:].
235    
236    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
237        defined or documented. It seems to have been a typo for PCRE_STATIC, so
238        I have changed it.
239    
240    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
241        first named subpattern) and a construct such as (?&a) would reference the
242        first named subpattern whose name started with "a" (in other words, the
243        length check was missing). Both these problems are fixed. "Subpattern name
244        expected" is now given for (?&) (a zero-length name), and this patch also
245        makes it give the same error for \k'' (previously it complained that that
246        was a reference to a non-existent subpattern).
247    
248    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
249        this is right because (?- can be followed by option settings as well as by
250        digits. I have, however, made the messages clearer.
251    
252    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
253        than the number used in the conditional) now cause a compile-time error.
254        This is actually not compatible with Perl, which accepts such patterns, but
255        treats the conditional as always being FALSE (as PCRE used to), but it
256        seems to me that giving a diagnostic is better.
257    
258    8.  Change "alphameric" to the more common word "alphanumeric" in comments
259        and messages.
260    
261    9.  Fix two occurrences of "backslash" in comments that should have been
262        "backspace".
263    
264    10. Remove two redundant lines of code that can never be obeyed (their function
265        was moved elsewhere).
266    
267    11. The program that makes PCRE's Unicode character property table had a bug
268        which caused it to generate incorrect table entries for sequences of
269        characters that have the same character type, but are in different scripts.
270        It amalgamated them into a single range, with the script of the first of
271        them. In other words, some characters were in the wrong script. There were
272        thirteen such cases, affecting characters in the following ranges:
273    
274          U+002b0 - U+002c1
275          U+0060c - U+0060d
276          U+0061e - U+00612
277          U+0064b - U+0065e
278          U+0074d - U+0076d
279          U+01800 - U+01805
280          U+01d00 - U+01d77
281          U+01d9b - U+01dbf
282          U+0200b - U+0200f
283          U+030fc - U+030fe
284          U+03260 - U+0327f
285          U+0fb46 - U+0fbb1
286          U+10450 - U+1049d
287    
288    12. The -o option (show only the matching part of a line) for pcregrep was not
289        compatible with GNU grep in that, if there was more than one match in a
290        line, it showed only the first of them. It now behaves in the same way as
291        GNU grep.
292    
293    13. If the -o and -v options were combined for pcregrep, it printed a blank
294        line for every non-matching line. GNU grep prints nothing, and pcregrep now
295        does the same. The return code can be used to tell if there were any
296        non-matching lines.
297    
298    14. Added --file-offsets and --line-offsets to pcregrep.
299    
300    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
301        infinitely looping recursion. The bug was that positive lookaheads were not
302        being skipped when checking for a possible empty match (negative lookaheads
303        and both kinds of lookbehind were skipped).
304    
305    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
306        inclusion of <windows.h> to before rather than after the definition of
307        INVALID_FILE_ATTRIBUTES (patch from David Byron).
308    
309    17. Specifying a possessive quantifier with a specific limit for a Unicode
310        character property caused pcre_compile() to compile bad code, which led at
311        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
312        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
313        caused the error; without that there was no problem.
314    
315    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
316    
317    19. Added --enable-pcretest-libreadline.
318    
319    20. In pcrecpp.cc, the variable 'count' was incremented twice in
320        RE::GlobalReplace(). As a result, the number of replacements returned was
321        double what it should be. I removed one of the increments, but Craig sent a
322        later patch that removed the other one (the right fix) and added unit tests
323        that check the return values (which was not done before).
324    
325    21. Several CMake things:
326    
327        (1) Arranged that, when cmake is used on Unix, the libraries end up with
328            the names libpcre and libpcreposix, not just pcre and pcreposix.
329    
330        (2) The above change means that pcretest and pcregrep are now correctly
331            linked with the newly-built libraries, not previously installed ones.
332    
333        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
334    
335    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
336        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
337        UTF-8 newline character). The key issue is that the pattern starts .*;
338        this means that the match must be either at the beginning, or after a
339        newline. The bug was in the code for advancing after a failed match and
340        checking that the new position followed a newline. It was not taking
341        account of UTF-8 characters correctly.
342    
343    23. PCRE was behaving differently from Perl in the way it recognized POSIX
344        character classes. PCRE was not treating the sequence [:...:] as a
345        character class unless the ... were all letters. Perl, however, seems to
346        allow any characters between [: and :], though of course it rejects as
347        unknown any "names" that contain non-letters, because all the known class
348        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
349        for example, whereas PCRE did not - it did not recognize a POSIX character
350        class. This seemed a bit dangerous, so the code has been changed to be
351        closer to Perl. The behaviour is not identical to Perl, because PCRE will
352        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
353        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
354        Perl does, and where it didn't before.
355    
356    24. Rewrite so as to remove the single use of %n from pcregrep because in some
357        Windows environments %n is disabled by default.
358    
359    
360    Version 7.4 21-Sep-07
361  ---------------------  ---------------------
362    
363  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 33  Version 7.4 10-Sep-07 Line 389  Version 7.4 10-Sep-07
389    
390  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
391      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
392      windows.h file is present (where different names are used). [This was      windows.h file is present (where different names are used). [This was
393      reversed later after testing - see 16 below.]      reversed later after testing - see 16 below.]
394    
395  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
# Line 63  Version 7.4 10-Sep-07 Line 419  Version 7.4 10-Sep-07
419    
420  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
421      checked only for CRLF.      checked only for CRLF.
422    
423  14. Added casts to pcretest.c to avoid compiler warnings.  14. Added casts to pcretest.c to avoid compiler warnings.
424    
425  15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.  15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
426    
427  16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,  16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
428      and instead check for _strtoi64 explicitly, and avoid the use of snprintf()      and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
429      entirely. This removes changes made in 7 above.      entirely. This removes changes made in 7 above.
430    
431    17. The CMake files have been updated, and there is now more information about
432        building with CMake in the NON-UNIX-USE document.
433    
434    
435  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07

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