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revision 165 by ph10, Wed May 9 10:50:57 2007 UTC revision 331 by ph10, Sat Apr 5 15:38:53 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.2 01-May-07  Version 7.7 05-Mar-08
5    ---------------------
7    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
8        a string to a long long, pretend we don't even have a long long." This is
9        done by checking for the strtoq, strtoll, and _strtoi64 functions.
11    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
12        pre-7.6 versions, which defined a global no_arg variable instead of putting
13        it in the RE class.
15    3.  Remove a line of dead code, identified by coverity and reported by Nuno
16        Lopes.
18    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
20        (1) The include/exclude patterns were being applied to the whole pathnames
21            of files, instead of just to the final components.
23        (2) If there was more than one level of directory, the subdirectories were
24            skipped unless they satisfied the include/exclude conditions. This is
25            inconsistent with GNU grep (and could even be seen as contrary to the
26            pcregrep specification - which I improved to make it absolutely clear).
27            The action now is always to scan all levels of directory, and just
28            apply the include/exclude patterns to regular files.
30    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
31        --exclude_dir in the tests to avoid scanning .svn directories.
33    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
34        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
35        doesn't support NULs in patterns.
37    7.  Added some missing "const"s to declarations of static tables in
38        pcre_compile.c and pcre_dfa_exec.c.
40    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
41        caused by fix #2  above. (Subsequently also a second patch to fix the
42        first patch. And a third patch - this was a messy problem.)
44    9.  Applied Craig's patch to remove the use of push_back().
47    Version 7.6 28-Jan-08
48    ---------------------
50    1.  A character class containing a very large number of characters with
51        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
52        overflow.
54    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
55        HAVE_LONG_LONG is not defined.
57    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
58        bring them up to date and include new features. This patch includes:
60        - Fixed PH's badly added libz and libbz2 support.
61        - Fixed a problem with static linking.
62        - Added pcredemo. [But later removed - see 7 below.]
63        - Fixed dftables problem and added an option.
64        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
65            HAVE_LONG_LONG.
66        - Added readline support for pcretest.
67        - Added an listing of the option settings after cmake has run.
69    4.  A user submitted a patch to Makefile that makes it easy to create
70        "pcre.dll" under mingw when using Configure/Make. I added stuff to
71        Makefile.am that cause it to include this special target, without
72        affecting anything else. Note that the same mingw target plus all
73        the other distribution libraries and programs are now supported
74        when configuring with CMake (see 6 below) instead of with
75        Configure/Make.
77    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
78        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
79        exported in the Windows port". It has not yet been confirmed that the patch
80        solves the problem, but it does no harm.
82    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
83        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
84        with CMake, and also correct the comment about stack recursion.
86    7.  Remove the automatic building of pcredemo from the ./configure system and
87        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
88        of a program that users should build themselves after PCRE is installed, so
89        building it automatically is not really right. What is more, it gave
90        trouble in some build environments.
92    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
95    Version 7.5 10-Jan-08
96    ---------------------
98    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
99        values in parens when parsing an RE using the C++ wrapper."
101    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
102        Characters greater than 255 were excluded from the class instead of being
103        included.
105    3.  The same bug as (2) above applied to negated POSIX classes such as
106        [:^space:].
108    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
109        defined or documented. It seems to have been a typo for PCRE_STATIC, so
110        I have changed it.
112    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
113        first named subpattern) and a construct such as (?&a) would reference the
114        first named subpattern whose name started with "a" (in other words, the
115        length check was missing). Both these problems are fixed. "Subpattern name
116        expected" is now given for (?&) (a zero-length name), and this patch also
117        makes it give the same error for \k'' (previously it complained that that
118        was a reference to a non-existent subpattern).
120    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
121        this is right because (?- can be followed by option settings as well as by
122        digits. I have, however, made the messages clearer.
124    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
125        than the number used in the conditional) now cause a compile-time error.
126        This is actually not compatible with Perl, which accepts such patterns, but
127        treats the conditional as always being FALSE (as PCRE used to), but it
128        seems to me that giving a diagnostic is better.
130    8.  Change "alphameric" to the more common word "alphanumeric" in comments
131        and messages.
133    9.  Fix two occurrences of "backslash" in comments that should have been
134        "backspace".
136    10. Remove two redundant lines of code that can never be obeyed (their function
137        was moved elsewhere).
139    11. The program that makes PCRE's Unicode character property table had a bug
140        which caused it to generate incorrect table entries for sequences of
141        characters that have the same character type, but are in different scripts.
142        It amalgamated them into a single range, with the script of the first of
143        them. In other words, some characters were in the wrong script. There were
144        thirteen such cases, affecting characters in the following ranges:
146          U+002b0 - U+002c1
147          U+0060c - U+0060d
148          U+0061e - U+00612
149          U+0064b - U+0065e
150          U+0074d - U+0076d
151          U+01800 - U+01805
152          U+01d00 - U+01d77
153          U+01d9b - U+01dbf
154          U+0200b - U+0200f
155          U+030fc - U+030fe
156          U+03260 - U+0327f
157          U+0fb46 - U+0fbb1
158          U+10450 - U+1049d
160    12. The -o option (show only the matching part of a line) for pcregrep was not
161        compatible with GNU grep in that, if there was more than one match in a
162        line, it showed only the first of them. It now behaves in the same way as
163        GNU grep.
165    13. If the -o and -v options were combined for pcregrep, it printed a blank
166        line for every non-matching line. GNU grep prints nothing, and pcregrep now
167        does the same. The return code can be used to tell if there were any
168        non-matching lines.
170    14. Added --file-offsets and --line-offsets to pcregrep.
172    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
173        infinitely looping recursion. The bug was that positive lookaheads were not
174        being skipped when checking for a possible empty match (negative lookaheads
175        and both kinds of lookbehind were skipped).
177    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
178        inclusion of <windows.h> to before rather than after the definition of
179        INVALID_FILE_ATTRIBUTES (patch from David Byron).
181    17. Specifying a possessive quantifier with a specific limit for a Unicode
182        character property caused pcre_compile() to compile bad code, which led at
183        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
184        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
185        caused the error; without that there was no problem.
187    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
189    19. Added --enable-pcretest-libreadline.
191    20. In pcrecpp.cc, the variable 'count' was incremented twice in
192        RE::GlobalReplace(). As a result, the number of replacements returned was
193        double what it should be. I removed one of the increments, but Craig sent a
194        later patch that removed the other one (the right fix) and added unit tests
195        that check the return values (which was not done before).
197    21. Several CMake things:
199        (1) Arranged that, when cmake is used on Unix, the libraries end up with
200            the names libpcre and libpcreposix, not just pcre and pcreposix.
202        (2) The above change means that pcretest and pcregrep are now correctly
203            linked with the newly-built libraries, not previously installed ones.
207    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
208        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
209        UTF-8 newline character). The key issue is that the pattern starts .*;
210        this means that the match must be either at the beginning, or after a
211        newline. The bug was in the code for advancing after a failed match and
212        checking that the new position followed a newline. It was not taking
213        account of UTF-8 characters correctly.
215    23. PCRE was behaving differently from Perl in the way it recognized POSIX
216        character classes. PCRE was not treating the sequence [:...:] as a
217        character class unless the ... were all letters. Perl, however, seems to
218        allow any characters between [: and :], though of course it rejects as
219        unknown any "names" that contain non-letters, because all the known class
220        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
221        for example, whereas PCRE did not - it did not recognize a POSIX character
222        class. This seemed a bit dangerous, so the code has been changed to be
223        closer to Perl. The behaviour is not identical to Perl, because PCRE will
224        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
225        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
226        Perl does, and where it didn't before.
228    24. Rewrite so as to remove the single use of %n from pcregrep because in some
229        Windows environments %n is disabled by default.
232    Version 7.4 21-Sep-07
233    ---------------------
235    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
236        means that a class such as [\s] counted as "explicit reference to CR or
237        LF". That isn't really right - the whole point of the change was to try to
238        help when there was an actual mention of one of the two characters. So now
239        the change happens only if \r or \n (or a literal CR or LF) character is
240        encountered.
242    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
243        of both had grown to the point where there were only 3 bits left.
244        Fortunately, there was spare space in the data structure, and so I have
245        moved the internal flags into a new 16-bit field to free up more option
246        bits.
248    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
249        but did not set the internal JCHANGED flag - either of these is enough to
250        control the way the "get" function works - but the PCRE_INFO_JCHANGED
251        facility is supposed to tell if (?J) was ever used, so now (?J) at the
252        start sets both bits.
254    4.  Added options (at build time, compile time, exec time) to change \R from
255        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
257    5.  doc/pcresyntax.html was missing from the distribution.
259    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
260        compatibility, even though it is no longer used.
262    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
263        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
264        windows.h file is present (where different names are used). [This was
265        reversed later after testing - see 16 below.]
267    8.  Changed all #include <config.h> to #include "config.h". There were also
268        some further <pcre.h> cases that I changed to "pcre.h".
270    9.  When pcregrep was used with the --colour option, it missed the line ending
271        sequence off the lines that it output.
273    10. It was pointed out to me that arrays of string pointers cause lots of
274        relocations when a shared library is dynamically loaded. A technique of
275        using a single long string with a table of offsets can drastically reduce
276        these. I have refactored PCRE in four places to do this. The result is
277        dramatic:
279          Originally:                          290
280          After changing UCP table:            187
281          After changing error message table:   43
282          After changing table of "verbs"       36
283          After changing table of Posix names   22
285        Thanks to the folks working on Gregex for glib for this insight.
287    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
288        unicode-properties was also set.
290    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
292    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
293        checked only for CRLF.
295    14. Added casts to pcretest.c to avoid compiler warnings.
297    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
299    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
300        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
301        entirely. This removes changes made in 7 above.
303    17. The CMake files have been updated, and there is now more information about
304        building with CMake in the NON-UNIX-USE document.
307    Version 7.3 28-Aug-07
308    ---------------------
310     1. In the rejigging of the build system that eventually resulted in 7.1, the
311        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
312        brackets there is not right, since it causes compilers to look for an
313        installed pcre.h, not the version that is in the source that is being
314        compiled (which of course may be different). I have changed it back to:
316          #include "pcre.h"
318        I have a vague recollection that the change was concerned with compiling in
319        different directories, but in the new build system, that is taken care of
320        by the VPATH setting the Makefile.
322     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
323        when the subject happened to end in the byte 0x85 (e.g. if the last
324        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
325        characters but of course it shouldn't be taken as a newline when it is part
326        of another character. The bug was that, for an unlimited repeat of . in
327        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
328        characters when looking for a newline.
330     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
332     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
333        in debug output.
335     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
336        long printing in the pcrecpp unittest when running under MinGW.
338     6. ESC_K was left out of the EBCDIC table.
340     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
341        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
342        limit also applies to "virtual nesting" when a pattern is recursive, and in
343        this case 1000 isn't so big. I have been able to remove this limit at the
344        expense of backing off one optimization in certain circumstances. Normally,
345        when pcre_exec() would call its internal match() function recursively and
346        immediately return the result unconditionally, it uses a "tail recursion"
347        feature to save stack. However, when a subpattern that can match an empty
348        string has an unlimited repetition quantifier, it no longer makes this
349        optimization. That gives it a stack frame in which to save the data for
350        checking that an empty string has been matched. Previously this was taken
351        from the 1000-entry workspace that had been reserved. So now there is no
352        explicit limit, but more stack is used.
354     8. Applied Daniel's patches to solve problems with the import/export magic
355        syntax that is required for Windows, and which was going wrong for the
356        pcreposix and pcrecpp parts of the library. These were overlooked when this
357        problem was solved for the main library.
359     9. There were some crude static tests to avoid integer overflow when computing
360        the size of patterns that contain repeated groups with explicit upper
361        limits. As the maximum quantifier is 65535, the maximum group length was
362        set at 30,000 so that the product of these two numbers did not overflow a
363        32-bit integer. However, it turns out that people want to use groups that
364        are longer than 30,000 bytes (though not repeat them that many times).
365        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
366        made it possible to implement the integer overflow checks in a much more
367        dynamic way, which I have now done. The artificial limitation on group
368        length has been removed - we now have only the limit on the total length of
369        the compiled pattern, which depends on the LINK_SIZE setting.
371    10. Fixed a bug in the documentation for get/copy named substring when
372        duplicate names are permitted. If none of the named substrings are set, the
373        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
374        empty string.
376    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
377        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
378        because the ] is interpreted as the first data character and the
379        terminating ] is not found. PCRE has been made compatible with Perl in this
380        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
381        cause memory overwriting.
383    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
384        string has been matched (to stop an infinite loop). It was not recognizing
385        a conditional subpattern that could match an empty string if that
386        subpattern was within another subpattern. For example, it looped when
387        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
388        condition was not nested. This bug has been fixed.
390    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
391        past the start of the subject in the presence of bytes with the top bit
392        set, for example "\x8aBCD".
394    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
395        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
397    14. Optimized (?!) to (*FAIL).
399    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
400        This restricts code points to be within the range 0 to 0x10FFFF, excluding
401        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
402        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
403        does: it's just the validity check that is more restrictive.
405    16. Inserted checks for integer overflows during escape sequence (backslash)
406        processing, and also fixed erroneous offset values for syntax errors during
407        backslash processing.
409    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
410        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
412    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
413        caused an overrun.
415    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
416        something other than just ASCII characters) inside a group that had an
417        unlimited repeat caused a loop at compile time (while checking to see
418        whether the group could match an empty string).
420    20. Debugging a pattern containing \p or \P could cause a crash. For example,
421        [\P{Any}] did so. (Error in the code for printing property names.)
423    21. An orphan \E inside a character class could cause a crash.
425    22. A repeated capturing bracket such as (A)? could cause a wild memory
426        reference during compilation.
428    23. There are several functions in pcre_compile() that scan along a compiled
429        expression for various reasons (e.g. to see if it's fixed length for look
430        behind). There were bugs in these functions when a repeated \p or \P was
431        present in the pattern. These operators have additional parameters compared
432        with \d, etc, and these were not being taken into account when moving along
433        the compiled data. Specifically:
435        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
436            length.
438        (b) An item such as \pL+ within a repeated group could cause crashes or
439            loops.
441        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
442            "reference to non-existent subpattern" error.
444        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
446    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
447        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
449    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
451    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
452        character were causing crashes (broken optimization).
454    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
455        \p or \P) caused a compile-time loop.
457    28. More problems have arisen in unanchored patterns when CRLF is a valid line
458        break. For example, the unstudied pattern [\r\n]A does not match the string
459        "\r\nA" because change 7.0/46 below moves the current point on by two
460        characters after failing to match at the start. However, the pattern \nA
461        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
462        the same is true. There doesn't seem any very clean way out of this, but
463        what I have chosen to do makes the common cases work: PCRE now takes note
464        of whether there can be an explicit match for \r or \n anywhere in the
465        pattern, and if so, 7.0/46 no longer applies. As part of this change,
466        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
467        pattern has explicit CR or LF references.
469    29. Added (*CR) etc for changing newline setting at start of pattern.
472    Version 7.2 19-Jun-07
473  ---------------------  ---------------------
475   1. If the fr_FR locale cannot be found for test 3, try the "french" locale,   1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
# Line 22  Version 7.2 01-May-07 Line 490  Version 7.2 01-May-07
490      a small improvement under Linux. However, it saves one field in the frame      a small improvement under Linux. However, it saves one field in the frame
491      in all cases.      in all cases.
493     6. Added more features from the forthcoming Perl 5.10:
495        (a) (?-n) (where n is a string of digits) is a relative subroutine or
496            recursion call. It refers to the nth most recently opened parentheses.
498        (b) (?+n) is also a relative subroutine call; it refers to the nth next
499            to be opened parentheses.
501        (c) Conditions that refer to capturing parentheses can be specified
502            relatively, for example, (?(-2)... or (?(+3)...
504        (d) \K resets the start of the current match so that everything before
505            is not part of it.
507        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
509        (f) \g{name} is another synonym - part of Perl 5.10's unification of
510            reference syntax.
512        (g) (?| introduces a group in which the numbering of parentheses in each
513            alternative starts with the same number.
515        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
517     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
520     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
521        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
522        for detecting groups that can match an empty string.
524     9. A pattern with a very large number of alternatives (more than several
525        hundred) was running out of internal workspace during the pre-compile
526        phase, where pcre_compile() figures out how much memory will be needed. A
527        bit of new cunning has reduced the workspace needed for groups with
528        alternatives. The 1000-alternative test pattern now uses 12 bytes of
529        workspace instead of running out of the 4096 that are available.
531    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
533    11. Applied patch from Google to remove an optimization that didn't quite work.
534        The report of the bug said:
536          pcrecpp::RE("a*").FullMatch("aaa") matches, while
537          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
538          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
540    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
541        it matched the wrong number of bytes.
544  Version 7.1 24-Apr-07  Version 7.1 24-Apr-07
545  ---------------------  ---------------------

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