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revision 483 by ph10, Mon Jan 4 16:19:17 2010 UTC revision 531 by ph10, Tue Jun 1 13:53:26 2010 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.01 11-Dec-09  Version 8.10 03 May-2010
5  ----------------------  ------------------------
6    
7    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
8        THEN.
9    
10    2.  (*ACCEPT) was not working when inside an atomic group.
11    
12    3.  Inside a character class, \B is treated as a literal by default, but
13        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
14        causes the error). The code is unchanged, but I tidied the documentation.
15    
16    4.  Inside a character class, PCRE always treated \R and \X as literals,
17        whereas Perl faults them if its -w option is set. I have changed PCRE so
18        that it faults them when PCRE_EXTRA is set.
19    
20    5.  Added support for \N, which always matches any character other than
21        newline. (It is the same as "." when PCRE_DOTALL is not set.)
22    
23    6.  When compiling pcregrep with newer versions of gcc which may have
24        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
25        declared with attribute warn_unused_result" were given. Just casting the
26        result to (void) does not stop the warnings; a more elaborate fudge is
27        needed. I've used a macro to implement this.
28    
29    7.  Minor change to pcretest.c to avoid a compiler warning.
30    
31    8.  Added four artifical Unicode properties to help with an option to make
32        \s etc use properties (see next item). The new properties are: Xan
33        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
34    
35    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
36        use Unicode properties. (*UCP) at the start of a pattern can be used to set
37        this option. Modified pcretest to add /W to test this facility. Added
38        REG_UCP to make it available via the POSIX interface.
39    
40    10. Added --line-buffered to pcregrep.
41    
42    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
43        studied, and the match started with a letter with a code point greater than
44        127 whose first byte was different to the first byte of the other case of
45        the letter, the other case of this starting letter was not recognized.
46    
47    12. pcreposix.c included pcre.h before including pcre_internal.h. This caused a
48        conflict in the definition of PCRE_EXP_DECL. I have removed the include of
49        pcre.h as pcre_internal.h includes pcre.h itself. (This may be a bit of
50        historical tidying that never got done.)
51    
52    13. If a pattern that was studied started with a repeated Unicode property
53        test, for example, \p{Nd}+, there was the theoretical possibility of
54        setting up an incorrect bitmap of starting bytes, but fortunately it could
55        not have actually happened in practice until change 8 above was made (it
56        added property types that matched character-matching opcodes).
57    
58    14. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
59        possible starting bytes for non-anchored patterns.
60    
61    15. The "auto-possessify" feature of pcre_compile() now recognizes \R.
62    
63    16. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
64        input, it could crash or give wrong results if characters with values
65        greater than 0xc0 were present in the subject string. (Detail: it assumed
66        UTF-8 input when processing these items.)
67    
68    17. Added a lot of (int) casts to avoid compiler warnings in systems where
69        size_t is 64-bit.
70    
71    18. Added a check for running out of memory when PCRE is compiled with
72        --disable-stack-for-recursion.
73    
74    
75    
76    Version 8.02 19-Mar-2010
77    ------------------------
78    
79    1.  The Unicode data tables have been updated to Unicode 5.2.0.
80    
81    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
82        configured.
83    
84    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
85        original author of that file, following a query about its status.
86    
87    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
88        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
89    
90    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
91        quantifier applied to a forward-referencing subroutine call, could compile
92        incorrect code or give the error "internal error: previously-checked
93        referenced subpattern not found".
94    
95    6.  Both MS Visual Studio and Symbian OS have problems with initializing
96        variables to point to external functions. For these systems, therefore,
97        pcre_malloc etc. are now initialized to local functions that call the
98        relevant global functions.
99    
100    7.  There were two entries missing in the vectors called coptable and poptable
101        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
102        I've fixed the data, and added a kludgy way of testing at compile time that
103        the lengths are correct (equal to the number of opcodes).
104    
105    8.  Following on from 7, I added a similar kludge to check the length of the
106        eint vector in pcreposix.c.
107    
108    9.  Error texts for pcre_compile() are held as one long string to avoid too
109        much relocation at load time. To find a text, the string is searched,
110        counting zeros. There was no check for running off the end of the string,
111        which could happen if a new error number was added without updating the
112        string.
113    
114    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
115    
116    11. \K was not working if it appeared in an atomic group or in a group that
117        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
118        \K is "not well defined" if used in an assertion. PCRE now accepts it if
119        the assertion is positive, but not if it is negative.
120    
121    12. Change 11 fortuitously reduced the size of the stack frame used in the
122        "match()" function of pcre_exec.c by one pointer. Forthcoming
123        implementation of support for (*MARK) will need an extra pointer on the
124        stack; I have reserved it now, so that the stack frame size does not
125        decrease.
126    
127    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
128        item in branch that calls a recursion is a subroutine call - as in the
129        second branch in the above example - was incorrectly given the compile-
130        time error "recursive call could loop indefinitely" because pcre_compile()
131        was not correctly checking the subroutine for matching a non-empty string.
132    
133    14. The checks for overrunning compiling workspace could trigger after an
134        overrun had occurred. This is a "should never occur" error, but it can be
135        triggered by pathological patterns such as hundreds of nested parentheses.
136        The checks now trigger 100 bytes before the end of the workspace.
137    
138    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
139    
140    
141    Version 8.01 19-Jan-2010
142    ------------------------
143    
144  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
145      particular, this includes all (DEFINE) patterns), a call to pcre_study()      particular, this includes all (*DEFINE) patterns), a call to pcre_study()
146      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
147      subpatterns).      subpatterns). This could cause incorrect "no match" results.
148    
149  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
150      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 198  Version 8.01 11-Dec-09
198      custom one, because of the following reported problem in Windows:      custom one, because of the following reported problem in Windows:
199    
200        - libbz2 uses the Pascal calling convention (WINAPI) for the functions        - libbz2 uses the Pascal calling convention (WINAPI) for the functions
201          under Win32.            under Win32.
202        - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",        - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
203          therefore missing the function definition.            therefore missing the function definition.
204        - The compiler thus generates a "C" signature for the test function.        - The compiler thus generates a "C" signature for the test function.
205        - The linker fails to find the "C" function.        - The linker fails to find the "C" function.
206        - PCRE fails to configure if asked to do so against libbz2.        - PCRE fails to configure if asked to do so against libbz2.
207    
208  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
209      messages were output:      messages were output:
210    
211        Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and        Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
212        rerunning libtoolize, to keep the correct libtool macros in-tree.        rerunning libtoolize, to keep the correct libtool macros in-tree.
213        Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.        Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
214    
215      I have done both of these things.      I have done both of these things.
216    
217  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()
218      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
219      runaway infinite recursion. I updated the discussion in the pcrestack man      runaway infinite recursion. I updated the discussion in the pcrestack man
220      page.      page.
221    
222  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
223      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
224      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
225      interpreted as invalid octal numbers. I've updated the previous comment in      interpreted as invalid octal numbers. I've updated the previous comment in
226      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
227      used.      used.
228    
229  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,
230      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
231      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.
232    
233  15. There were some discrepancies between the declarations in pcre_internal.h  15. There were some discrepancies between the declarations in pcre_internal.h
234      of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and      of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
235      their definitions. The declarations used "const uschar *" and the      their definitions. The declarations used "const uschar *" and the
236      definitions used USPTR. Even though USPTR is normally defined as "const      definitions used USPTR. Even though USPTR is normally defined as "const
237      unsigned char *" (and uschar is typedeffed as "unsigned char"), it was      unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
238      reported that: "This difference in casting confuses some C++ compilers, for      reported that: "This difference in casting confuses some C++ compilers, for
239      example, SunCC recognizes above declarations as different functions and      example, SunCC recognizes above declarations as different functions and
240      generates broken code for hbpcre." I have changed the declarations to use      generates broken code for hbpcre." I have changed the declarations to use
241      USPTR.      USPTR.
242    
243    16. GNU libtool is named differently on some systems. The autogen.sh script now
244        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
245        (FreeBSD).
246    
247    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
248        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
249        comment: "Figure out how to create a longlong from a string: strtoll and
250        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
251        instance, but it only takes 2 args instead of 3!"
252    
253    18. A subtle bug concerned with back references has been fixed by a change of
254        specification, with a corresponding code fix. A pattern such as
255        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
256        refers, was giving matches when it shouldn't. For example, xa=xaaa would
257        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
258        same bug. Such groups have to be quantified to be useful, or contained
259        inside another quantified group. (If there's no repetition, the reference
260        can never match.) The problem arises because, having left the group and
261        moved on to the rest of the pattern, a later failure that backtracks into
262        the group uses the captured value from the final iteration of the group
263        rather than the correct earlier one. I have fixed this in PCRE by forcing
264        any group that contains a reference to itself to be an atomic group; that
265        is, there cannot be any backtracking into it once it has completed. This is
266        similar to recursive and subroutine calls.
267    
268    
269  Version 8.00 19-Oct-09  Version 8.00 19-Oct-09

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