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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.01 11-Dec-09  Version 8.13 30-Apr-2011
5  ----------------------  ------------------------
6    
7    1.  The Unicode data tables have been updated to Unicode 6.0.0.
8    
9    2.  Two minor typos in pcre_internal.h have been fixed.
10    
11    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
12        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
13        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
14    
15    4.  There were a number of related bugs in the code for matching backrefences
16        caselessly in UTF-8 mode when codes for the characters concerned were
17        different numbers of bytes. For example, U+023A and U+2C65 are an upper
18        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
19        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
20        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
21        2-byte code at the end of the subject (it thought there wasn't enough data
22        left).
23    
24    5.  Comprehensive information about what went wrong is now returned by
25        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
26        as the output vector has at least 2 elements. The offset of the start of
27        the failing character and a reason code are placed in the vector.
28    
29    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
30        now returned is for the first byte of the failing character, instead of the
31        last byte inspected. This is an incompatible change, but I hope it is small
32        enough not to be a problem. It makes the returned offset consistent with
33        pcre_exec() and pcre_dfa_exec().
34    
35    7.  pcretest now gives a text phrase as well as the error number when
36        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
37        failure, the offset and reason code are output.
38    
39    8.  When \R was used with a maximizing quantifier it failed to skip backwards
40        over a \r\n pair if the subsequent match failed. Instead, it just skipped
41        back over a single character (\n). This seems wrong (because it treated the
42        two characters as a single entity when going forwards), conflicts with the
43        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
44        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
45        has been changed.
46    
47    
48    Version 8.12 15-Jan-2011
49    ------------------------
50    
51    1.  Fixed some typos in the markup of the man pages, and wrote a script that
52        checks for such things as part of the documentation building process.
53    
54    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
55        --match-limit and --recursion-limit options (added for 8.11). In
56        particular, this made one of the standard tests fail. (The integer value
57        went into the wrong half of a long int.)
58    
59    3.  If the --colour option was given to pcregrep with -v (invert match), it
60        did strange things, either producing crazy output, or crashing. It should,
61        of course, ignore a request for colour when reporting lines that do not
62        match.
63    
64    4.  Another pcregrep bug caused similar problems if --colour was specified with
65        -M (multiline) and the pattern match finished with a line ending.
66    
67    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
68        matched in multiline mode, the following line was shown as part of the
69        match. This seems wrong, so I have changed it.
70    
71    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
72        the check for further matches in the same line (so they could be coloured)
73        to overrun the end of the current line. If another match was found, it was
74        incorrectly shown (and then shown again when found in the next line).
75    
76    7.  If pcregrep was compiled under Windows, there was a reference to the
77        function pcregrep_exit() before it was defined. I am assuming this was
78        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
79        reported by a user. I've moved the definition above the reference.
80    
81    
82    Version 8.11 10-Dec-2010
83    ------------------------
84    
85    1.  (*THEN) was not working properly if there were untried alternatives prior
86        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
87        backtracked to try for "b" instead of moving to the next alternative branch
88        at the same level (in this case, to look for "c"). The Perl documentation
89        is clear that when (*THEN) is backtracked onto, it goes to the "next
90        alternative in the innermost enclosing group".
91    
92    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
93        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
94        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
95        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
96        (*THEN).
97    
98    3.  If \s appeared in a character class, it removed the VT character from
99        the class, even if it had been included by some previous item, for example
100        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
101        of \s, but is part of the POSIX "space" class.)
102    
103    4.  A partial match never returns an empty string (because you can always
104        match an empty string at the end of the subject); however the checking for
105        an empty string was starting at the "start of match" point. This has been
106        changed to the "earliest inspected character" point, because the returned
107        data for a partial match starts at this character. This means that, for
108        example, /(?<=abc)def/ gives a partial match for the subject "abc"
109        (previously it gave "no match").
110    
111    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
112        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
113        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
114        has an implication that the given string is incomplete (because a partial
115        match is preferred over a full match). For this reason, these items now
116        give a partial match in this situation. [Aside: previously, the one case
117        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
118        match rather than a full match, which was wrong by the old rules, but is
119        now correct.]
120    
121    6.  There was a bug in the handling of #-introduced comments, recognized when
122        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
123        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
124        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
125        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
126        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
127        places in pcre_compile().
128    
129    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
130        comments when looking ahead for named forward references to subpatterns,
131        the only newline sequence it recognized was NL. It now handles newlines
132        according to the set newline convention.
133    
134    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
135        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
136        cater for a lack of strerror(). These oversights have been fixed.
137    
138    9.  Added --match-limit and --recursion-limit to pcregrep.
139    
140    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
141    
142    11. When the -o option was used, pcregrep was setting a return code of 1, even
143        when matches were found, and --line-buffered was not being honoured.
144    
145    12. Added an optional parentheses number to the -o and --only-matching options
146        of pcregrep.
147    
148    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
149        can match an empty string. The code to do it in pcretest and pcredemo
150        needed fixing:
151    
152        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
153            only one byte after an empty string match just before CRLF (this case
154            just got forgotten; "any" and "anycrlf" were OK).
155    
156        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
157            mode when an empty string match preceded an ASCII character followed by
158            a non-ASCII character. (The code for advancing by one character rather
159            than one byte was nonsense.)
160    
161        (c) The pcredemo.c sample program did not have any code at all to handle
162            the cases when CRLF is a valid newline sequence.
163    
164    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
165        as a starting offset was within the subject string. There is now a new
166        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
167        negative or greater than the length of the string. In order to test this,
168        pcretest is extended to allow the setting of negative starting offsets.
169    
170    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
171        starting offset points to the beginning of a UTF-8 character was
172        unnecessarily clumsy. I tidied it up.
173    
174    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
175        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
176    
177    17. Nobody had reported that the --include_dir option, which was added in
178        release 7.7 should have been called --include-dir (hyphen, not underscore)
179        for compatibility with GNU grep. I have changed it to --include-dir, but
180        left --include_dir as an undocumented synonym, and the same for
181        --exclude-dir, though that is not available in GNU grep, at least as of
182        release 2.5.4.
183    
184    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
185        characters from a string of bytes) have been redefined so as not to use
186        loops, in order to improve performance in some environments. At the same
187        time, I abstracted some of the common code into auxiliary macros to save
188        repetition (this should not affect the compiled code).
189    
190    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
191        compile-time error is now given if \c is not followed by an ASCII
192        character, that is, a byte less than 128. (In EBCDIC mode, the code is
193        different, and any byte value is allowed.)
194    
195    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
196        START_OPTIMIZE option, which is now allowed at compile time - but just
197        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
198        to pcregrep and other applications that have no direct access to PCRE
199        options. The new /Y option in pcretest sets this option when calling
200        pcre_compile().
201    
202    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
203        back references. Groups containing recursive back references were forced to
204        be atomic by that change, but in the case of named groups, the amount of
205        memory required was incorrectly computed, leading to "Failed: internal
206        error: code overflow". This has been fixed.
207    
208    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
209        pcretest.c, to avoid build problems in some Borland environments.
210    
211    
212    Version 8.10 25-Jun-2010
213    ------------------------
214    
215    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
216        THEN.
217    
218    2.  (*ACCEPT) was not working when inside an atomic group.
219    
220    3.  Inside a character class, \B is treated as a literal by default, but
221        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
222        causes the error). The code is unchanged, but I tidied the documentation.
223    
224    4.  Inside a character class, PCRE always treated \R and \X as literals,
225        whereas Perl faults them if its -w option is set. I have changed PCRE so
226        that it faults them when PCRE_EXTRA is set.
227    
228    5.  Added support for \N, which always matches any character other than
229        newline. (It is the same as "." when PCRE_DOTALL is not set.)
230    
231    6.  When compiling pcregrep with newer versions of gcc which may have
232        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
233        declared with attribute warn_unused_result" were given. Just casting the
234        result to (void) does not stop the warnings; a more elaborate fudge is
235        needed. I've used a macro to implement this.
236    
237    7.  Minor change to pcretest.c to avoid a compiler warning.
238    
239    8.  Added four artifical Unicode properties to help with an option to make
240        \s etc use properties (see next item). The new properties are: Xan
241        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
242    
243    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
244        use Unicode properties. (*UCP) at the start of a pattern can be used to set
245        this option. Modified pcretest to add /W to test this facility. Added
246        REG_UCP to make it available via the POSIX interface.
247    
248    10. Added --line-buffered to pcregrep.
249    
250    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
251        studied, and the match started with a letter with a code point greater than
252        127 whose first byte was different to the first byte of the other case of
253        the letter, the other case of this starting letter was not recognized
254        (#976).
255    
256    12. If a pattern that was studied started with a repeated Unicode property
257        test, for example, \p{Nd}+, there was the theoretical possibility of
258        setting up an incorrect bitmap of starting bytes, but fortunately it could
259        not have actually happened in practice until change 8 above was made (it
260        added property types that matched character-matching opcodes).
261    
262    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
263        possible starting bytes for non-anchored patterns.
264    
265    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
266        \R, and also a number of cases that involve Unicode properties, both
267        explicit and implicit when PCRE_UCP is set.
268    
269    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
270        input, it could crash or give wrong results if characters with values
271        greater than 0xc0 were present in the subject string. (Detail: it assumed
272        UTF-8 input when processing these items.)
273    
274    16. Added a lot of (int) casts to avoid compiler warnings in systems where
275        size_t is 64-bit (#991).
276    
277    17. Added a check for running out of memory when PCRE is compiled with
278        --disable-stack-for-recursion (#990).
279    
280    18. If the last data line in a file for pcretest does not have a newline on
281        the end, a newline was missing in the output.
282    
283    19. The default pcre_chartables.c file recognizes only ASCII characters (values
284        less than 128) in its various bitmaps. However, there is a facility for
285        generating tables according to the current locale when PCRE is compiled. It
286        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
287        characters, are recognized by isspace() and therefore were getting set in
288        these tables, and indeed these tables seem to approximate to ISO 8859. This
289        caused a problem in UTF-8 mode when pcre_study() was used to create a list
290        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
291        which of course cannot start UTF-8 characters. I have changed the code so
292        that only real ASCII characters (less than 128) and the correct starting
293        bytes for UTF-8 encodings are set for characters greater than 127 when in
294        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
295        altogether.)
296    
297    20. Added the /T option to pcretest so as to be able to run tests with non-
298        standard character tables, thus making it possible to include the tests
299        used for 19 above in the standard set of tests.
300    
301    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
302        reference to a subpattern the other side of a comment that contains an
303        opening parenthesis caused either an internal compiling error, or a
304        reference to the wrong subpattern.
305    
306    
307    Version 8.02 19-Mar-2010
308    ------------------------
309    
310    1.  The Unicode data tables have been updated to Unicode 5.2.0.
311    
312    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
313        configured.
314    
315    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
316        original author of that file, following a query about its status.
317    
318    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
319        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
320    
321    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
322        quantifier applied to a forward-referencing subroutine call, could compile
323        incorrect code or give the error "internal error: previously-checked
324        referenced subpattern not found".
325    
326    6.  Both MS Visual Studio and Symbian OS have problems with initializing
327        variables to point to external functions. For these systems, therefore,
328        pcre_malloc etc. are now initialized to local functions that call the
329        relevant global functions.
330    
331    7.  There were two entries missing in the vectors called coptable and poptable
332        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
333        I've fixed the data, and added a kludgy way of testing at compile time that
334        the lengths are correct (equal to the number of opcodes).
335    
336    8.  Following on from 7, I added a similar kludge to check the length of the
337        eint vector in pcreposix.c.
338    
339    9.  Error texts for pcre_compile() are held as one long string to avoid too
340        much relocation at load time. To find a text, the string is searched,
341        counting zeros. There was no check for running off the end of the string,
342        which could happen if a new error number was added without updating the
343        string.
344    
345    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
346    
347    11. \K was not working if it appeared in an atomic group or in a group that
348        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
349        \K is "not well defined" if used in an assertion. PCRE now accepts it if
350        the assertion is positive, but not if it is negative.
351    
352    12. Change 11 fortuitously reduced the size of the stack frame used in the
353        "match()" function of pcre_exec.c by one pointer. Forthcoming
354        implementation of support for (*MARK) will need an extra pointer on the
355        stack; I have reserved it now, so that the stack frame size does not
356        decrease.
357    
358    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
359        item in branch that calls a recursion is a subroutine call - as in the
360        second branch in the above example - was incorrectly given the compile-
361        time error "recursive call could loop indefinitely" because pcre_compile()
362        was not correctly checking the subroutine for matching a non-empty string.
363    
364    14. The checks for overrunning compiling workspace could trigger after an
365        overrun had occurred. This is a "should never occur" error, but it can be
366        triggered by pathological patterns such as hundreds of nested parentheses.
367        The checks now trigger 100 bytes before the end of the workspace.
368    
369    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
370    
371    
372    Version 8.01 19-Jan-2010
373    ------------------------
374    
375  1.  If a pattern contained a conditional subpattern with only one branch (in  1.  If a pattern contained a conditional subpattern with only one branch (in
376      particular, this includes all (DEFINE) patterns), a call to pcre_study()      particular, this includes all (*DEFINE) patterns), a call to pcre_study()
377      computed the wrong minimum data length (which is of course zero for such      computed the wrong minimum data length (which is of course zero for such
378      subpatterns).      subpatterns). This could cause incorrect "no match" results.
379    
380  2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of  2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
381      the pattern is reset in the first branch, pcre_compile() failed with      the pattern is reset in the first branch, pcre_compile() failed with
# Line 61  Version 8.01 11-Dec-09 Line 429  Version 8.01 11-Dec-09
429      custom one, because of the following reported problem in Windows:      custom one, because of the following reported problem in Windows:
430    
431        - libbz2 uses the Pascal calling convention (WINAPI) for the functions        - libbz2 uses the Pascal calling convention (WINAPI) for the functions
432          under Win32.            under Win32.
433        - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",        - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
434          therefore missing the function definition.            therefore missing the function definition.
435        - The compiler thus generates a "C" signature for the test function.        - The compiler thus generates a "C" signature for the test function.
436        - The linker fails to find the "C" function.        - The linker fails to find the "C" function.
437        - PCRE fails to configure if asked to do so against libbz2.        - PCRE fails to configure if asked to do so against libbz2.
438    
439  11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these  11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
440      messages were output:      messages were output:
441    
442        Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and        Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
443        rerunning libtoolize, to keep the correct libtool macros in-tree.        rerunning libtoolize, to keep the correct libtool macros in-tree.
444        Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.        Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
445    
446      I have done both of these things.      I have done both of these things.
447    
448  12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()  12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
449      most of the time, it *can* run out if it is given a pattern that contains a      most of the time, it *can* run out if it is given a pattern that contains a
450      runaway infinite recursion. I updated the discussion in the pcrestack man      runaway infinite recursion. I updated the discussion in the pcrestack man
451      page.      page.
452    
453  13. Now that we have gone to the x.xx style of version numbers, the minor  13. Now that we have gone to the x.xx style of version numbers, the minor
454      version may start with zero. Using 08 or 09 is a bad idea because users      version may start with zero. Using 08 or 09 is a bad idea because users
455      might check the value of PCRE_MINOR in their code, and 08 or 09 may be      might check the value of PCRE_MINOR in their code, and 08 or 09 may be
456      interpreted as invalid octal numbers. I've updated the previous comment in      interpreted as invalid octal numbers. I've updated the previous comment in
457      configure.ac, and also added a check that gives an error if 08 or 09 are      configure.ac, and also added a check that gives an error if 08 or 09 are
458      used.      used.
459    
460  14. Change 8.00/11 was not quite complete: code had been accidentally omitted,  14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
461      causing partial matching to fail when the end of the subject matched \W      causing partial matching to fail when the end of the subject matched \W
462      in a UTF-8 pattern where \W was quantified with a minimum of 3.      in a UTF-8 pattern where \W was quantified with a minimum of 3.
463    
464  15. There were some discrepancies between the declarations in pcre_internal.h  15. There were some discrepancies between the declarations in pcre_internal.h
465      of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and      of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
466      their definitions. The declarations used "const uschar *" and the      their definitions. The declarations used "const uschar *" and the
467      definitions used USPTR. Even though USPTR is normally defined as "const      definitions used USPTR. Even though USPTR is normally defined as "const
468      unsigned char *" (and uschar is typedeffed as "unsigned char"), it was      unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
469      reported that: "This difference in casting confuses some C++ compilers, for      reported that: "This difference in casting confuses some C++ compilers, for
470      example, SunCC recognizes above declarations as different functions and      example, SunCC recognizes above declarations as different functions and
471      generates broken code for hbpcre." I have changed the declarations to use      generates broken code for hbpcre." I have changed the declarations to use
472      USPTR.      USPTR.
473    
474    16. GNU libtool is named differently on some systems. The autogen.sh script now
475        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
476        (FreeBSD).
477    
478    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
479        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
480        comment: "Figure out how to create a longlong from a string: strtoll and
481        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
482        instance, but it only takes 2 args instead of 3!"
483    
484    18. A subtle bug concerned with back references has been fixed by a change of
485        specification, with a corresponding code fix. A pattern such as
486        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
487        refers, was giving matches when it shouldn't. For example, xa=xaaa would
488        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
489        same bug. Such groups have to be quantified to be useful, or contained
490        inside another quantified group. (If there's no repetition, the reference
491        can never match.) The problem arises because, having left the group and
492        moved on to the rest of the pattern, a later failure that backtracks into
493        the group uses the captured value from the final iteration of the group
494        rather than the correct earlier one. I have fixed this in PCRE by forcing
495        any group that contains a reference to itself to be an atomic group; that
496        is, there cannot be any backtracking into it once it has completed. This is
497        similar to recursive and subroutine calls.
498    
499    
500  Version 8.00 19-Oct-09  Version 8.00 19-Oct-09

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