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revision 255 by ph10, Wed Sep 19 08:50:04 2007 UTC revision 311 by ph10, Wed Jan 23 17:34:58 2008 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.4 10-Sep-07  Version 7.6 21-Jan-08
5    ---------------------
6    
7    1.  A character class containing a very large number of characters with
8        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
9        overflow.
10    
11    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
12        HAVE_LONG_LONG is not defined.
13    
14    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
15        bring them up to date and include new features. This patch includes:
16    
17        - Fixed PH's badly added libz and libbz2 support.
18        - Fixed a problem with static linking.
19        - Added pcredemo.
20        - Fixed dftables problem and added an option.
21        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
22            HAVE_LONG_LONG.
23        - Added readline support for pcretest.
24        - Added an listing of the option settings after cmake has run.
25    
26    4.  A user submitted a patch to Makefile that makes it easy to created a dll
27        under mingw. I added stuff to Makefile.am that cause it to include this
28        special target, without affecting anything else.
29    
30    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
31        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
32        exported in the Windows port". It has not yet been confirmed that the patch
33        solves the problem, but it does no harm.
34    
35    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
36        NON_STANDARD_LIB_SUFFIX and correct the comment about stack recursion.
37    
38    
39    Version 7.5 10-Jan-08
40    ---------------------
41    
42    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
43        values in parens when parsing an RE using the C++ wrapper."
44    
45    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
46        Characters greater than 255 were excluded from the class instead of being
47        included.
48    
49    3.  The same bug as (2) above applied to negated POSIX classes such as
50        [:^space:].
51    
52    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
53        defined or documented. It seems to have been a typo for PCRE_STATIC, so
54        I have changed it.
55    
56    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
57        first named subpattern) and a construct such as (?&a) would reference the
58        first named subpattern whose name started with "a" (in other words, the
59        length check was missing). Both these problems are fixed. "Subpattern name
60        expected" is now given for (?&) (a zero-length name), and this patch also
61        makes it give the same error for \k'' (previously it complained that that
62        was a reference to a non-existent subpattern).
63    
64    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
65        this is right because (?- can be followed by option settings as well as by
66        digits. I have, however, made the messages clearer.
67    
68    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
69        than the number used in the conditional) now cause a compile-time error.
70        This is actually not compatible with Perl, which accepts such patterns, but
71        treats the conditional as always being FALSE (as PCRE used to), but it
72        seems to me that giving a diagnostic is better.
73    
74    8.  Change "alphameric" to the more common word "alphanumeric" in comments
75        and messages.
76    
77    9.  Fix two occurrences of "backslash" in comments that should have been
78        "backspace".
79    
80    10. Remove two redundant lines of code that can never be obeyed (their function
81        was moved elsewhere).
82    
83    11. The program that makes PCRE's Unicode character property table had a bug
84        which caused it to generate incorrect table entries for sequences of
85        characters that have the same character type, but are in different scripts.
86        It amalgamated them into a single range, with the script of the first of
87        them. In other words, some characters were in the wrong script. There were
88        thirteen such cases, affecting characters in the following ranges:
89    
90          U+002b0 - U+002c1
91          U+0060c - U+0060d
92          U+0061e - U+00612
93          U+0064b - U+0065e
94          U+0074d - U+0076d
95          U+01800 - U+01805
96          U+01d00 - U+01d77
97          U+01d9b - U+01dbf
98          U+0200b - U+0200f
99          U+030fc - U+030fe
100          U+03260 - U+0327f
101          U+0fb46 - U+0fbb1
102          U+10450 - U+1049d
103    
104    12. The -o option (show only the matching part of a line) for pcregrep was not
105        compatible with GNU grep in that, if there was more than one match in a
106        line, it showed only the first of them. It now behaves in the same way as
107        GNU grep.
108    
109    13. If the -o and -v options were combined for pcregrep, it printed a blank
110        line for every non-matching line. GNU grep prints nothing, and pcregrep now
111        does the same. The return code can be used to tell if there were any
112        non-matching lines.
113    
114    14. Added --file-offsets and --line-offsets to pcregrep.
115    
116    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
117        infinitely looping recursion. The bug was that positive lookaheads were not
118        being skipped when checking for a possible empty match (negative lookaheads
119        and both kinds of lookbehind were skipped).
120    
121    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
122        inclusion of <windows.h> to before rather than after the definition of
123        INVALID_FILE_ATTRIBUTES (patch from David Byron).
124    
125    17. Specifying a possessive quantifier with a specific limit for a Unicode
126        character property caused pcre_compile() to compile bad code, which led at
127        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
128        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
129        caused the error; without that there was no problem.
130    
131    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
132    
133    19. Added --enable-pcretest-libreadline.
134    
135    20. In pcrecpp.cc, the variable 'count' was incremented twice in
136        RE::GlobalReplace(). As a result, the number of replacements returned was
137        double what it should be. I removed one of the increments, but Craig sent a
138        later patch that removed the other one (the right fix) and added unit tests
139        that check the return values (which was not done before).
140    
141    21. Several CMake things:
142    
143        (1) Arranged that, when cmake is used on Unix, the libraries end up with
144            the names libpcre and libpcreposix, not just pcre and pcreposix.
145    
146        (2) The above change means that pcretest and pcregrep are now correctly
147            linked with the newly-built libraries, not previously installed ones.
148    
149        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
150    
151    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
152        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
153        UTF-8 newline character). The key issue is that the pattern starts .*;
154        this means that the match must be either at the beginning, or after a
155        newline. The bug was in the code for advancing after a failed match and
156        checking that the new position followed a newline. It was not taking
157        account of UTF-8 characters correctly.
158    
159    23. PCRE was behaving differently from Perl in the way it recognized POSIX
160        character classes. PCRE was not treating the sequence [:...:] as a
161        character class unless the ... were all letters. Perl, however, seems to
162        allow any characters between [: and :], though of course it rejects as
163        unknown any "names" that contain non-letters, because all the known class
164        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
165        for example, whereas PCRE did not - it did not recognize a POSIX character
166        class. This seemed a bit dangerous, so the code has been changed to be
167        closer to Perl. The behaviour is not identical to Perl, because PCRE will
168        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
169        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
170        Perl does, and where it didn't before.
171    
172    24. Rewrite so as to remove the single use of %n from pcregrep because in some
173        Windows environments %n is disabled by default.
174    
175    
176    Version 7.4 21-Sep-07
177  ---------------------  ---------------------
178    
179  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
# Line 33  Version 7.4 10-Sep-07 Line 205  Version 7.4 10-Sep-07
205    
206  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
207      strtoull to pcrecpp.cc to select the available functions in WIN32 when the      strtoull to pcrecpp.cc to select the available functions in WIN32 when the
208      windows.h file is present (where different names are used).      windows.h file is present (where different names are used). [This was
209        reversed later after testing - see 16 below.]
210    
211  8.  Changed all #include <config.h> to #include "config.h". There were also  8.  Changed all #include <config.h> to #include "config.h". There were also
212      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
# Line 62  Version 7.4 10-Sep-07 Line 235  Version 7.4 10-Sep-07
235    
236  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
237      checked only for CRLF.      checked only for CRLF.
238    
239  14. Added casts to pcretest.c to avoid compiler warnings.  14. Added casts to pcretest.c to avoid compiler warnings.
240    
241    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
242    
243    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
244        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
245        entirely. This removes changes made in 7 above.
246    
247    17. The CMake files have been updated, and there is now more information about
248        building with CMake in the NON-UNIX-USE document.
249    
250    
251  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07

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