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revision 482 by ph10, Mon Jan 4 15:55:46 2010 UTC revision 491 by ph10, Mon Mar 1 17:45:08 2010 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.01 11-Dec-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    
10    Version 8.01 19-Jan-2010
11    ------------------------
12    
13  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
14      particular, this includes all (DEFINE) patterns), a call to pcre_study()      particular, this includes all (*DEFINE) patterns), a call to pcre_study()
15      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
16      subpatterns).      subpatterns). This could cause incorrect "no match" results.
17    
18  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
19      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 67  Version 8.01 11-Dec-09
67      custom one, because of the following reported problem in Windows:      custom one, because of the following reported problem in Windows:
68    
69        - libbz2 uses the Pascal calling convention (WINAPI) for the functions        - libbz2 uses the Pascal calling convention (WINAPI) for the functions
70          under Win32.            under Win32.
71        - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",        - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
72          therefore missing the function definition.            therefore missing the function definition.
73        - The compiler thus generates a "C" signature for the test function.        - The compiler thus generates a "C" signature for the test function.
74        - The linker fails to find the "C" function.        - The linker fails to find the "C" function.
75        - PCRE fails to configure if asked to do so against libbz2.        - PCRE fails to configure if asked to do so against libbz2.
76    
77  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
78      messages were output:      messages were output:
79    
80        Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and        Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
81        rerunning libtoolize, to keep the correct libtool macros in-tree.        rerunning libtoolize, to keep the correct libtool macros in-tree.
82        Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.        Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
83    
84      I have done both of these things.      I have done both of these things.
85    
86  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()
87      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
88      runaway infinite recursion. I updated the discussion in the pcrestack man      runaway infinite recursion. I updated the discussion in the pcrestack man
89      page.      page.
90    
91  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
92      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
93      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
94      interpreted as invalid octal numbers. I've updated the previous comment in      interpreted as invalid octal numbers. I've updated the previous comment in
95      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
96      used.      used.
97    
98  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,
99      causing partial matching to fail where the end of the subject matched \W.      causing partial matching to fail when the end of the subject matched \W
100        in a UTF-8 pattern where \W was quantified with a minimum of 3.
101    
102    15. There were some discrepancies between the declarations in pcre_internal.h
103        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
104        their definitions. The declarations used "const uschar *" and the
105        definitions used USPTR. Even though USPTR is normally defined as "const
106        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
107        reported that: "This difference in casting confuses some C++ compilers, for
108        example, SunCC recognizes above declarations as different functions and
109        generates broken code for hbpcre." I have changed the declarations to use
110        USPTR.
111    
112    16. GNU libtool is named differently on some systems. The autogen.sh script now
113        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
114        (FreeBSD).
115    
116    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
117        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
118        comment: "Figure out how to create a longlong from a string: strtoll and
119        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
120        instance, but it only takes 2 args instead of 3!"
121    
122    18. A subtle bug concerned with back references has been fixed by a change of
123        specification, with a corresponding code fix. A pattern such as
124        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
125        refers, was giving matches when it shouldn't. For example, xa=xaaa would
126        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
127        same bug. Such groups have to be quantified to be useful, or contained
128        inside another quantified group. (If there's no repetition, the reference
129        can never match.) The problem arises because, having left the group and
130        moved on to the rest of the pattern, a later failure that backtracks into
131        the group uses the captured value from the final iteration of the group
132        rather than the correct earlier one. I have fixed this in PCRE by forcing
133        any group that contains a reference to itself to be an atomic group; that
134        is, there cannot be any backtracking into it once it has completed. This is
135        similar to recursive and subroutine calls.
136    
137    
138  Version 8.00 19-Oct-09  Version 8.00 19-Oct-09

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