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revision 256 by ph10, Wed Sep 19 08:57:53 2007 UTC revision 314 by ph10, Fri Jan 25 17:09:21 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. [But later removed - see 7 below.]
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 create
27        "pcre.dll" under mingw when using Configure/Make. I added stuff to
28        Makefile.am that cause it to include this special target, without
29        affecting anything else. Note that the same mingw target plus all
30        the other distribution libraries and programs are now supported
31        when configuring with CMake (see 6 below) instead of with
32        Configure/Make.
33    
34    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
35        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
36        exported in the Windows port". It has not yet been confirmed that the patch
37        solves the problem, but it does no harm.
38    
39    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
40        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
41        with CMake, and also correct the comment about stack recursion.
42    
43    7.  Remove the automatic building of pcredemo from the ./configure system and
44        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
45        of a program that users should build themselves after PCRE is installed, so
46        building it automatically is not really right. What is more, it gave
47        trouble in some build environments.
48    
49    
50    Version 7.5 10-Jan-08
51    ---------------------
52    
53    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
54        values in parens when parsing an RE using the C++ wrapper."
55    
56    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
57        Characters greater than 255 were excluded from the class instead of being
58        included.
59    
60    3.  The same bug as (2) above applied to negated POSIX classes such as
61        [:^space:].
62    
63    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
64        defined or documented. It seems to have been a typo for PCRE_STATIC, so
65        I have changed it.
66    
67    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
68        first named subpattern) and a construct such as (?&a) would reference the
69        first named subpattern whose name started with "a" (in other words, the
70        length check was missing). Both these problems are fixed. "Subpattern name
71        expected" is now given for (?&) (a zero-length name), and this patch also
72        makes it give the same error for \k'' (previously it complained that that
73        was a reference to a non-existent subpattern).
74    
75    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
76        this is right because (?- can be followed by option settings as well as by
77        digits. I have, however, made the messages clearer.
78    
79    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
80        than the number used in the conditional) now cause a compile-time error.
81        This is actually not compatible with Perl, which accepts such patterns, but
82        treats the conditional as always being FALSE (as PCRE used to), but it
83        seems to me that giving a diagnostic is better.
84    
85    8.  Change "alphameric" to the more common word "alphanumeric" in comments
86        and messages.
87    
88    9.  Fix two occurrences of "backslash" in comments that should have been
89        "backspace".
90    
91    10. Remove two redundant lines of code that can never be obeyed (their function
92        was moved elsewhere).
93    
94    11. The program that makes PCRE's Unicode character property table had a bug
95        which caused it to generate incorrect table entries for sequences of
96        characters that have the same character type, but are in different scripts.
97        It amalgamated them into a single range, with the script of the first of
98        them. In other words, some characters were in the wrong script. There were
99        thirteen such cases, affecting characters in the following ranges:
100    
101          U+002b0 - U+002c1
102          U+0060c - U+0060d
103          U+0061e - U+00612
104          U+0064b - U+0065e
105          U+0074d - U+0076d
106          U+01800 - U+01805
107          U+01d00 - U+01d77
108          U+01d9b - U+01dbf
109          U+0200b - U+0200f
110          U+030fc - U+030fe
111          U+03260 - U+0327f
112          U+0fb46 - U+0fbb1
113          U+10450 - U+1049d
114    
115    12. The -o option (show only the matching part of a line) for pcregrep was not
116        compatible with GNU grep in that, if there was more than one match in a
117        line, it showed only the first of them. It now behaves in the same way as
118        GNU grep.
119    
120    13. If the -o and -v options were combined for pcregrep, it printed a blank
121        line for every non-matching line. GNU grep prints nothing, and pcregrep now
122        does the same. The return code can be used to tell if there were any
123        non-matching lines.
124    
125    14. Added --file-offsets and --line-offsets to pcregrep.
126    
127    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
128        infinitely looping recursion. The bug was that positive lookaheads were not
129        being skipped when checking for a possible empty match (negative lookaheads
130        and both kinds of lookbehind were skipped).
131    
132    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
133        inclusion of <windows.h> to before rather than after the definition of
134        INVALID_FILE_ATTRIBUTES (patch from David Byron).
135    
136    17. Specifying a possessive quantifier with a specific limit for a Unicode
137        character property caused pcre_compile() to compile bad code, which led at
138        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
139        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
140        caused the error; without that there was no problem.
141    
142    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
143    
144    19. Added --enable-pcretest-libreadline.
145    
146    20. In pcrecpp.cc, the variable 'count' was incremented twice in
147        RE::GlobalReplace(). As a result, the number of replacements returned was
148        double what it should be. I removed one of the increments, but Craig sent a
149        later patch that removed the other one (the right fix) and added unit tests
150        that check the return values (which was not done before).
151    
152    21. Several CMake things:
153    
154        (1) Arranged that, when cmake is used on Unix, the libraries end up with
155            the names libpcre and libpcreposix, not just pcre and pcreposix.
156    
157        (2) The above change means that pcretest and pcregrep are now correctly
158            linked with the newly-built libraries, not previously installed ones.
159    
160        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
161    
162    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
163        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
164        UTF-8 newline character). The key issue is that the pattern starts .*;
165        this means that the match must be either at the beginning, or after a
166        newline. The bug was in the code for advancing after a failed match and
167        checking that the new position followed a newline. It was not taking
168        account of UTF-8 characters correctly.
169    
170    23. PCRE was behaving differently from Perl in the way it recognized POSIX
171        character classes. PCRE was not treating the sequence [:...:] as a
172        character class unless the ... were all letters. Perl, however, seems to
173        allow any characters between [: and :], though of course it rejects as
174        unknown any "names" that contain non-letters, because all the known class
175        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
176        for example, whereas PCRE did not - it did not recognize a POSIX character
177        class. This seemed a bit dangerous, so the code has been changed to be
178        closer to Perl. The behaviour is not identical to Perl, because PCRE will
179        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
180        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
181        Perl does, and where it didn't before.
182    
183    24. Rewrite so as to remove the single use of %n from pcregrep because in some
184        Windows environments %n is disabled by default.
185    
186    
187    Version 7.4 21-Sep-07
188  ---------------------  ---------------------
189    
190  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 216  Version 7.4 10-Sep-07
216    
217  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
218      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
219      windows.h file is present (where different names are used).      windows.h file is present (where different names are used). [This was
220        reversed later after testing - see 16 below.]
221    
222  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
223      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 246  Version 7.4 10-Sep-07
246    
247  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
248      checked only for CRLF.      checked only for CRLF.
249    
250  14. Added casts to pcretest.c to avoid compiler warnings.  14. Added casts to pcretest.c to avoid compiler warnings.
251    
252  15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.  15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
253    
254    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
255        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
256        entirely. This removes changes made in 7 above.
257    
258    17. The CMake files have been updated, and there is now more information about
259        building with CMake in the NON-UNIX-USE document.
260    
261    
262  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
263  ---------------------  ---------------------

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