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revision 461 by ph10, Mon Oct 5 10:59:35 2009 UTC revision 492 by ph10, Tue Mar 2 11:26:55 2010 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.00 05-Oct-09  Version 8.02 01-Mar-2010
5    ------------------------
6    
7    1.  The Unicode data tables have been updated to Unicode 5.2.0.
8    
9    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
10        configured.
11    
12    
13    Version 8.01 19-Jan-2010
14    ------------------------
15    
16    1.  If a pattern contained a conditional subpattern with only one branch (in
17        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
18        computed the wrong minimum data length (which is of course zero for such
19        subpatterns). This could cause incorrect "no match" results.
20    
21    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
22        the pattern is reset in the first branch, pcre_compile() failed with
23        "internal error: code overflow at offset...". This happened only when
24        the reset was to the original external option setting. (An optimization
25        abstracts leading options settings into an external setting, which was the
26        cause of this.)
27    
28    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
29        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
30        assertion pattern did not match (meaning that the assertion was true), it
31        was incorrectly treated as false if the SKIP had been reached during the
32        matching. This also applied to assertions used as conditions.
33    
34    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
35        assertion subpattern, including such a pattern used as a condition,
36        unpredictable results occurred, instead of the error return
37        PCRE_ERROR_DFA_UITEM.
38    
39    5.  The C++ GlobalReplace function was not working like Perl for the special
40        situation when an empty string is matched. It now does the fancy magic
41        stuff that is necessary.
42    
43    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
44        removed. (These were left over from very, very early versions of PCRE.)
45    
46    7.  Some cosmetic changes to the code to make life easier when compiling it
47        as part of something else:
48    
49        (a) Change DEBUG to PCRE_DEBUG.
50    
51        (b) In pcre_compile(), rename the member of the "branch_chain" structure
52            called "current" as "current_branch", to prevent a collision with the
53            Linux macro when compiled as a kernel module.
54    
55        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
56            prevent a collision with the Linux macro when compiled as a kernel
57            module.
58    
59    8.  In pcre_compile() there are some checks for integer overflows that used to
60        cast potentially large values to (double). This has been changed to that
61        when building, a check for int64_t is made, and if it is found, it is used
62        instead, thus avoiding the use of floating point arithmetic. (There is no
63        other use of FP in PCRE.) If int64_t is not found, the fallback is to
64        double.
65    
66    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
67        2005 (difference between two addresses compared to an unsigned value).
68    
69    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
70        custom one, because of the following reported problem in Windows:
71    
72          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
73              under Win32.
74          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
75              therefore missing the function definition.
76          - The compiler thus generates a "C" signature for the test function.
77          - The linker fails to find the "C" function.
78          - PCRE fails to configure if asked to do so against libbz2.
79    
80    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
81        messages were output:
82    
83          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
84          rerunning libtoolize, to keep the correct libtool macros in-tree.
85          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
86    
87        I have done both of these things.
88    
89    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
90        most of the time, it *can* run out if it is given a pattern that contains a
91        runaway infinite recursion. I updated the discussion in the pcrestack man
92        page.
93    
94    13. Now that we have gone to the x.xx style of version numbers, the minor
95        version may start with zero. Using 08 or 09 is a bad idea because users
96        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
97        interpreted as invalid octal numbers. I've updated the previous comment in
98        configure.ac, and also added a check that gives an error if 08 or 09 are
99        used.
100    
101    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
102        causing partial matching to fail when the end of the subject matched \W
103        in a UTF-8 pattern where \W was quantified with a minimum of 3.
104    
105    15. There were some discrepancies between the declarations in pcre_internal.h
106        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
107        their definitions. The declarations used "const uschar *" and the
108        definitions used USPTR. Even though USPTR is normally defined as "const
109        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
110        reported that: "This difference in casting confuses some C++ compilers, for
111        example, SunCC recognizes above declarations as different functions and
112        generates broken code for hbpcre." I have changed the declarations to use
113        USPTR.
114    
115    16. GNU libtool is named differently on some systems. The autogen.sh script now
116        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
117        (FreeBSD).
118    
119    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
120        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
121        comment: "Figure out how to create a longlong from a string: strtoll and
122        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
123        instance, but it only takes 2 args instead of 3!"
124    
125    18. A subtle bug concerned with back references has been fixed by a change of
126        specification, with a corresponding code fix. A pattern such as
127        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
128        refers, was giving matches when it shouldn't. For example, xa=xaaa would
129        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
130        same bug. Such groups have to be quantified to be useful, or contained
131        inside another quantified group. (If there's no repetition, the reference
132        can never match.) The problem arises because, having left the group and
133        moved on to the rest of the pattern, a later failure that backtracks into
134        the group uses the captured value from the final iteration of the group
135        rather than the correct earlier one. I have fixed this in PCRE by forcing
136        any group that contains a reference to itself to be an atomic group; that
137        is, there cannot be any backtracking into it once it has completed. This is
138        similar to recursive and subroutine calls.
139    
140    
141    Version 8.00 19-Oct-09
142  ----------------------  ----------------------
143    
144  1.  The table for translating pcre_compile() error codes into POSIX error codes  1.  The table for translating pcre_compile() error codes into POSIX error codes
# Line 58  Version 8.00 05-Oct-09 Line 195  Version 8.00 05-Oct-09
195  10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is  10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
196      synonymous with PCRE_PARTIAL, for backwards compatibility, and      synonymous with PCRE_PARTIAL, for backwards compatibility, and
197      PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,      PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
198      and may be more useful for multi-segment matching, especially with      and may be more useful for multi-segment matching.
     pcre_exec().  
199    
200  11. Partial matching with pcre_exec() is now more intuitive. A partial match  11. Partial matching with pcre_exec() is now more intuitive. A partial match
201      used to be given if ever the end of the subject was reached; now it is      used to be given if ever the end of the subject was reached; now it is
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