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revision 322 by ph10, Wed Mar 5 17:14:08 2008 UTC revision 364 by ph10, Fri Jul 11 14:53:41 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.7 05-Mar-08  Version 8.0 02 Jul-08
5    ---------------------
6    
7    1.  Replaced UCP searching code with optimized version as implemented for Ad
8        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
9        stage table and inline lookup instead of a function, giving speed ups of 2
10        to 5 times on some simple patterns that I tested. Permission was given to
11        distribute the MultiStage2.py script that generates the tables (it's not in
12        the tarball, but is in the Subversion repository).
13    
14    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
15        scripts.
16    
17    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
18        a group with a zero qualifier. The result of the study could be incorrect,
19        or the function might crash, depending on the pattern.
20    
21    4.  Caseless matching was not working for non-ASCII characters in back
22        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
23        It now works when Unicode Property Support is available.
24    
25    5.  In pcretest, an escape such as \x{de} in the data was always generating
26        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
27        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
28        truncation.
29    
30    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
31    
32    7.  Added two (int) casts to pcregrep when printing the difference of two
33        pointers, in case they are 64-bit values.
34    
35    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
36        test 2 if it fails.
37    
38    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
39        and a #define of that name to empty if it is not externally set. This is to
40        allow users of MSVC to set it if necessary.
41    
42    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
43        the convenience functions in the pcre_get.c source file.
44    
45    11. An option change at the start of a pattern that had top-level alternatives
46        could cause overwriting and/or a crash. This command provoked a crash in
47        some environments:
48    
49          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
50    
51        This potential security problem was recorded as CVE-2008-2371.
52    
53    12. For a pattern where the match had to start at the beginning or immediately
54        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
55        pcre_dfa_exec() could read past the end of the passed subject if there was
56        no match. To help with detecting such bugs (e.g. with valgrind), I modified
57        pcretest so that it places the subject at the end of its malloc-ed buffer.
58    
59    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
60        exec() might read past the end of the data buffer in UTF-8 mode.
61    
62    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
63        the data contained the byte 0x85 as part of a UTF-8 character within its
64        first line.
65    
66    
67    Version 7.7 07-May-08
68  ---------------------  ---------------------
69    
70  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
71      a string to a long long, pretend we don't even have a long long." This is      a string to a long long, pretend we don't even have a long long." This is
72      done by checking for the strtoq, strtoll, and _strtoi64 functions.      done by checking for the strtoq, strtoll, and _strtoi64 functions.
73    
74  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
75      pre-7.6 versions, which defined a global no_arg variable instead of putting      pre-7.6 versions, which defined a global no_arg variable instead of putting
76      it in the RE class.      it in the RE class. (See also #8 below.)
77    
78    3.  Remove a line of dead code, identified by coverity and reported by Nuno
79        Lopes.
80    
81    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
82    
83        (1) The include/exclude patterns were being applied to the whole pathnames
84            of files, instead of just to the final components.
85    
86        (2) If there was more than one level of directory, the subdirectories were
87            skipped unless they satisfied the include/exclude conditions. This is
88            inconsistent with GNU grep (and could even be seen as contrary to the
89            pcregrep specification - which I improved to make it absolutely clear).
90            The action now is always to scan all levels of directory, and just
91            apply the include/exclude patterns to regular files.
92    
93    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
94        --exclude_dir in the tests to avoid scanning .svn directories.
95    
96    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
97        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
98        doesn't support NULs in patterns.
99    
100    7.  Added some missing "const"s to declarations of static tables in
101        pcre_compile.c and pcre_dfa_exec.c.
102    
103    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
104        caused by fix #2  above. (Subsequently also a second patch to fix the
105        first patch. And a third patch - this was a messy problem.)
106    
107    9.  Applied Craig's patch to remove the use of push_back().
108    
109    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
110        matching function regexec().
111    
112    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
113        which, however, unlike Perl's \g{...}, are subroutine calls, not back
114        references. PCRE supports relative numbers with this syntax (I don't think
115        Oniguruma does).
116    
117    12. Previously, a group with a zero repeat such as (...){0} was completely
118        omitted from the compiled regex. However, this means that if the group
119        was called as a subroutine from elsewhere in the pattern, things went wrong
120        (an internal error was given). Such groups are now left in the compiled
121        pattern, with a new opcode that causes them to be skipped at execution
122        time.
123    
124    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
125        to the way PCRE behaves:
126    
127        (a) A lone ] character is dis-allowed (Perl treats it as data).
128    
129        (b) A back reference to an unmatched subpattern matches an empty string
130            (Perl fails the current match path).
131    
132        (c) A data ] in a character class must be notated as \] because if the
133            first data character in a class is ], it defines an empty class. (In
134            Perl it is not possible to have an empty class.) The empty class []
135            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
136            The negative empty class [^] matches any one character, independently
137            of the DOTALL setting.
138    
139    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
140        non-existent subpattern following a character class starting with ']' and
141        containing () gave an internal compiling error instead of "reference to
142        non-existent subpattern". Fortunately, when the pattern did exist, the
143        compiled code was correct. (When scanning forwards to check for the
144        existencd of the subpattern, it was treating the data ']' as terminating
145        the class, so got the count wrong. When actually compiling, the reference
146        was subsequently set up correctly.)
147    
148    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
149        it was being rejected as not supported by pcre_dfa_exec(), even though
150        other assertions are supported. I have made pcre_dfa_exec() support
151        (*FAIL).
152    
153    16. The implementation of 13c above involved the invention of a new opcode,
154        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
155        cannot be changed at match time, I realized I could make a small
156        improvement to matching performance by compiling OP_ALLANY instead of
157        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
158        on the OP_ANY path.
159    
160    17. Compiling pcretest on Windows with readline support failed without the
161        following two fixes: (1) Make the unistd.h include conditional on
162        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
163    
164    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
165        ncurses library to be included for pcretest when ReadLine support is
166        requested, but also to allow for it to be overridden. This patch came from
167        Daniel Bergström.
168    
169    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
170        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
171        any errors with the current Unicode tables. Thanks to Peter Kankowski for
172        spotting this.
173    
174    
175  Version 7.6 28-Jan-08  Version 7.6 28-Jan-08

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