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revision 501 by ph10, Sun Mar 7 11:49:54 2010 UTC revision 585 by ph10, Wed Jan 12 17:21:11 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.02 01-Mar-2010  Version 8.12 12-Jan-2011
5    ------------------------
6    
7    1.  Fixed some typos in the markup of the man pages, and wrote a script that
8        checks for such things as part of the documentation building process.
9    
10    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
11        --match-limit and --recursion-limit options (added for 8.11). In
12        particular, this made one of the standard tests crash. (The integer value
13        went into the wrong half of a long int.)
14    
15    3.  If the --colour option was given to pcregrep with -v (invert match), it
16        did strange things, either producing crazy output, or crashing. It should,
17        of course, ignore a request for colour when reporting lines that do not
18        match.
19    
20    
21    Version 8.11 10-Dec-2010
22    ------------------------
23    
24    1.  (*THEN) was not working properly if there were untried alternatives prior
25        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
26        backtracked to try for "b" instead of moving to the next alternative branch
27        at the same level (in this case, to look for "c"). The Perl documentation
28        is clear that when (*THEN) is backtracked onto, it goes to the "next
29        alternative in the innermost enclosing group".
30    
31    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
32        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
33        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
34        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
35        (*THEN).
36    
37    3.  If \s appeared in a character class, it removed the VT character from
38        the class, even if it had been included by some previous item, for example
39        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
40        of \s, but is part of the POSIX "space" class.)
41    
42    4.  A partial match never returns an empty string (because you can always
43        match an empty string at the end of the subject); however the checking for
44        an empty string was starting at the "start of match" point. This has been
45        changed to the "earliest inspected character" point, because the returned
46        data for a partial match starts at this character. This means that, for
47        example, /(?<=abc)def/ gives a partial match for the subject "abc"
48        (previously it gave "no match").
49    
50    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
51        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
52        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
53        has an implication that the given string is incomplete (because a partial
54        match is preferred over a full match). For this reason, these items now
55        give a partial match in this situation. [Aside: previously, the one case
56        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
57        match rather than a full match, which was wrong by the old rules, but is
58        now correct.]
59    
60    6.  There was a bug in the handling of #-introduced comments, recognized when
61        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
62        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
63        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
64        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
65        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
66        places in pcre_compile().
67    
68    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
69        comments when looking ahead for named forward references to subpatterns,
70        the only newline sequence it recognized was NL. It now handles newlines
71        according to the set newline convention.
72    
73    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
74        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
75        cater for a lack of strerror(). These oversights have been fixed.
76    
77    9.  Added --match-limit and --recursion-limit to pcregrep.
78    
79    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
80    
81    11. When the -o option was used, pcregrep was setting a return code of 1, even
82        when matches were found, and --line-buffered was not being honoured.
83    
84    12. Added an optional parentheses number to the -o and --only-matching options
85        of pcregrep.
86    
87    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
88        can match an empty string. The code to do it in pcretest and pcredemo
89        needed fixing:
90    
91        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
92            only one byte after an empty string match just before CRLF (this case
93            just got forgotten; "any" and "anycrlf" were OK).
94    
95        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
96            mode when an empty string match preceded an ASCII character followed by
97            a non-ASCII character. (The code for advancing by one character rather
98            than one byte was nonsense.)
99    
100        (c) The pcredemo.c sample program did not have any code at all to handle
101            the cases when CRLF is a valid newline sequence.
102    
103    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
104        as a starting offset was within the subject string. There is now a new
105        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
106        negative or greater than the length of the string. In order to test this,
107        pcretest is extended to allow the setting of negative starting offsets.
108    
109    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
110        starting offset points to the beginning of a UTF-8 character was
111        unnecessarily clumsy. I tidied it up.
112    
113    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
114        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
115    
116    17. Nobody had reported that the --include_dir option, which was added in
117        release 7.7 should have been called --include-dir (hyphen, not underscore)
118        for compatibility with GNU grep. I have changed it to --include-dir, but
119        left --include_dir as an undocumented synonym, and the same for
120        --exclude-dir, though that is not available in GNU grep, at least as of
121        release 2.5.4.
122    
123    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
124        characters from a string of bytes) have been redefined so as not to use
125        loops, in order to improve performance in some environments. At the same
126        time, I abstracted some of the common code into auxiliary macros to save
127        repetition (this should not affect the compiled code).
128    
129    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
130        compile-time error is now given if \c is not followed by an ASCII
131        character, that is, a byte less than 128. (In EBCDIC mode, the code is
132        different, and any byte value is allowed.)
133    
134    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
135        START_OPTIMIZE option, which is now allowed at compile time - but just
136        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
137        to pcregrep and other applications that have no direct access to PCRE
138        options. The new /Y option in pcretest sets this option when calling
139        pcre_compile().
140    
141    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
142        back references. Groups containing recursive back references were forced to
143        be atomic by that change, but in the case of named groups, the amount of
144        memory required was incorrectly computed, leading to "Failed: internal
145        error: code overflow". This has been fixed.
146    
147    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
148        pcretest.c, to avoid build problems in some Borland environments.
149    
150    
151    Version 8.10 25-Jun-2010
152    ------------------------
153    
154    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
155        THEN.
156    
157    2.  (*ACCEPT) was not working when inside an atomic group.
158    
159    3.  Inside a character class, \B is treated as a literal by default, but
160        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
161        causes the error). The code is unchanged, but I tidied the documentation.
162    
163    4.  Inside a character class, PCRE always treated \R and \X as literals,
164        whereas Perl faults them if its -w option is set. I have changed PCRE so
165        that it faults them when PCRE_EXTRA is set.
166    
167    5.  Added support for \N, which always matches any character other than
168        newline. (It is the same as "." when PCRE_DOTALL is not set.)
169    
170    6.  When compiling pcregrep with newer versions of gcc which may have
171        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
172        declared with attribute warn_unused_result" were given. Just casting the
173        result to (void) does not stop the warnings; a more elaborate fudge is
174        needed. I've used a macro to implement this.
175    
176    7.  Minor change to pcretest.c to avoid a compiler warning.
177    
178    8.  Added four artifical Unicode properties to help with an option to make
179        \s etc use properties (see next item). The new properties are: Xan
180        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
181    
182    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
183        use Unicode properties. (*UCP) at the start of a pattern can be used to set
184        this option. Modified pcretest to add /W to test this facility. Added
185        REG_UCP to make it available via the POSIX interface.
186    
187    10. Added --line-buffered to pcregrep.
188    
189    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
190        studied, and the match started with a letter with a code point greater than
191        127 whose first byte was different to the first byte of the other case of
192        the letter, the other case of this starting letter was not recognized
193        (#976).
194    
195    12. If a pattern that was studied started with a repeated Unicode property
196        test, for example, \p{Nd}+, there was the theoretical possibility of
197        setting up an incorrect bitmap of starting bytes, but fortunately it could
198        not have actually happened in practice until change 8 above was made (it
199        added property types that matched character-matching opcodes).
200    
201    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
202        possible starting bytes for non-anchored patterns.
203    
204    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
205        \R, and also a number of cases that involve Unicode properties, both
206        explicit and implicit when PCRE_UCP is set.
207    
208    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
209        input, it could crash or give wrong results if characters with values
210        greater than 0xc0 were present in the subject string. (Detail: it assumed
211        UTF-8 input when processing these items.)
212    
213    16. Added a lot of (int) casts to avoid compiler warnings in systems where
214        size_t is 64-bit (#991).
215    
216    17. Added a check for running out of memory when PCRE is compiled with
217        --disable-stack-for-recursion (#990).
218    
219    18. If the last data line in a file for pcretest does not have a newline on
220        the end, a newline was missing in the output.
221    
222    19. The default pcre_chartables.c file recognizes only ASCII characters (values
223        less than 128) in its various bitmaps. However, there is a facility for
224        generating tables according to the current locale when PCRE is compiled. It
225        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
226        characters, are recognized by isspace() and therefore were getting set in
227        these tables, and indeed these tables seem to approximate to ISO 8859. This
228        caused a problem in UTF-8 mode when pcre_study() was used to create a list
229        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
230        which of course cannot start UTF-8 characters. I have changed the code so
231        that only real ASCII characters (less than 128) and the correct starting
232        bytes for UTF-8 encodings are set for characters greater than 127 when in
233        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
234        altogether.)
235    
236    20. Added the /T option to pcretest so as to be able to run tests with non-
237        standard character tables, thus making it possible to include the tests
238        used for 19 above in the standard set of tests.
239    
240    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
241        reference to a subpattern the other side of a comment that contains an
242        opening parenthesis caused either an internal compiling error, or a
243        reference to the wrong subpattern.
244    
245    
246    Version 8.02 19-Mar-2010
247  ------------------------  ------------------------
248    
249  1.  The Unicode data tables have been updated to Unicode 5.2.0.  1.  The Unicode data tables have been updated to Unicode 5.2.0.
250    
251  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
252      configured.      configured.
253    
254  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
255      original author of that file, following a query about its status.      original author of that file, following a query about its status.
256    
257  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
258      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
259    
260  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
261      quantifier applied to a forward-referencing subroutine call, could compile      quantifier applied to a forward-referencing subroutine call, could compile
262      incorrect code or give the error "internal error: previously-checked      incorrect code or give the error "internal error: previously-checked
263      referenced subpattern not found".      referenced subpattern not found".
264    
265  6.  Both MS Visual Studio and Symbian OS have problems with initializing  6.  Both MS Visual Studio and Symbian OS have problems with initializing
266      variables to point to external functions. For these systems, therefore,      variables to point to external functions. For these systems, therefore,
267      pcre_malloc etc. are now initialized to local functions that call the      pcre_malloc etc. are now initialized to local functions that call the
268      relevant global functions.      relevant global functions.
269    
270  7.  There were two entries missing in the vectors called coptable and poptable  7.  There were two entries missing in the vectors called coptable and poptable
271      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
272      I've fixed the data, and added a kludgy way of testing at compile time that      I've fixed the data, and added a kludgy way of testing at compile time that
273      the lengths are correct (equal to the number of opcodes).      the lengths are correct (equal to the number of opcodes).
274    
275  8.  Following on from 7, I added a similar kludge to check the length of the  8.  Following on from 7, I added a similar kludge to check the length of the
276      eint vector in pcreposix.c.      eint vector in pcreposix.c.
277    
278  9.  Error texts for pcre_compile() are held as one long string to avoid too  9.  Error texts for pcre_compile() are held as one long string to avoid too
279      much relocation at load time. To find a text, the string is searched,      much relocation at load time. To find a text, the string is searched,
280      counting zeros. There was no check for running off the end of the string,      counting zeros. There was no check for running off the end of the string,
281      which could happen if a new error number was added without updating the      which could happen if a new error number was added without updating the
282      string.      string.
283    
284  10. \K gave a compile-time error if it appeared in a lookbehind assersion.  10. \K gave a compile-time error if it appeared in a lookbehind assersion.
285    
286  11. \K was not working if it appeared in an atomic group or in a group that  11. \K was not working if it appeared in an atomic group or in a group that
287      was called as a "subroutine", or in an assertion. Perl 5.11 documents that      was called as a "subroutine", or in an assertion. Perl 5.11 documents that
288      \K is "not well defined" if used in an assertion. PCRE now accepts it if      \K is "not well defined" if used in an assertion. PCRE now accepts it if
289      the assertion is positive, but not if it is negative.      the assertion is positive, but not if it is negative.
290    
291  12. Change 11 fortuitously reduced the size of the stack frame used in the  12. Change 11 fortuitously reduced the size of the stack frame used in the
292      "match()" function of pcre_exec.c by one pointer. Forthcoming      "match()" function of pcre_exec.c by one pointer. Forthcoming
293      implementation of support for (*MARK) will need an extra pointer on the      implementation of support for (*MARK) will need an extra pointer on the
294      stack; I have reserved it now, so that the stack frame size does not      stack; I have reserved it now, so that the stack frame size does not
295      decrease.      decrease.
296    
297    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
298        item in branch that calls a recursion is a subroutine call - as in the
299        second branch in the above example - was incorrectly given the compile-
300        time error "recursive call could loop indefinitely" because pcre_compile()
301        was not correctly checking the subroutine for matching a non-empty string.
302    
303    14. The checks for overrunning compiling workspace could trigger after an
304        overrun had occurred. This is a "should never occur" error, but it can be
305        triggered by pathological patterns such as hundreds of nested parentheses.
306        The checks now trigger 100 bytes before the end of the workspace.
307    
308    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
309    
310    
311  Version 8.01 19-Jan-2010  Version 8.01 19-Jan-2010
312  ------------------------  ------------------------

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