/[pcre]/code/tags/pcre-8.01/ChangeLog
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revision 300 by ph10, Mon Jan 14 19:43:19 2008 UTC revision 419 by ph10, Wed Aug 12 10:45:33 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.6 14-Jan-08  Version 8.00 ??-???-??
5    ----------------------
6    
7    1.  The table for translating pcre_compile() error codes into POSIX error codes
8        was out-of-date, and there was no check on the pcre_compile() error code
9        being within the table. This could lead to an OK return being given in
10        error.
11    
12    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
13        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
14        in a Windows environment.
15    
16    
17    Version 7.9 11-Apr-09
18    ---------------------
19    
20    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
21        (pcretest), all targets were linked against these libraries. This included
22        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
23        libraries. This caused unwanted dependencies to be created. This problem
24        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
25        pcretest is linked with readline.
26    
27    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
28        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
29        moved outside it again, because FALSE and TRUE are already defined in AIX,
30        but BOOL is not.
31    
32    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
33        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
34    
35    4.  The pcregrep documentation said spaces were inserted as well as colons (or
36        hyphens) following file names and line numbers when outputting matching
37        lines. This is not true; no spaces are inserted. I have also clarified the
38        wording for the --colour (or --color) option.
39    
40    5.  In pcregrep, when --colour was used with -o, the list of matching strings
41        was not coloured; this is different to GNU grep, so I have changed it to be
42        the same.
43    
44    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
45        each matching line was coloured. Now it goes on to look for further matches
46        of any of the test patterns, which is the same behaviour as GNU grep.
47    
48    7.  A pattern that could match an empty string could cause pcregrep to loop; it
49        doesn't make sense to accept an empty string match in pcregrep, so I have
50        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
51        seems to be how GNU grep behaves.
52    
53    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
54        start or after a newline", because the conditional assertion was not being
55        correctly handled. The rule now is that both the assertion and what follows
56        in the first alternative must satisfy the test.
57    
58    9.  If auto-callout was enabled in a pattern with a conditional group whose
59        condition was an assertion, PCRE could crash during matching, both with
60        pcre_exec() and pcre_dfa_exec().
61    
62    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
63        used for matching.
64    
65    11. Unicode property support in character classes was not working for
66        characters (bytes) greater than 127 when not in UTF-8 mode.
67    
68    12. Added the -M command line option to pcretest.
69    
70    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
71    
72    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
73    
74    16. Added comments and documentation about mis-use of no_arg in the C++
75        wrapper.
76    
77    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
78        from Martin Jerabek that uses macro names for all relevant character and
79        string constants.
80    
81    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
82        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
83        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
84        these, but not everybody uses configure.
85    
86    19. A conditional group that had only one branch was not being correctly
87        recognized as an item that could match an empty string. This meant that an
88        enclosing group might also not be so recognized, causing infinite looping
89        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
90        with the subject "ab", where knowledge that the repeated group can match
91        nothing is needed in order to break the loop.
92    
93    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
94        exec(), but without supplying a callout function, matching went wrong.
95    
96    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
97        leak if the size of the offset vector was greater than 30. When the vector
98        is smaller, the saved offsets during recursion go onto a local stack
99        vector, but for larger vectors malloc() is used. It was failing to free
100        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
101        error, in fact).
102    
103    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
104        heapframe that is used only when UTF-8 support is enabled. This caused no
105        problem, but was untidy.
106    
107    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
108        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
109        included within another project.
110    
111    24. Steven Van Ingelgem's patches to add more options to the CMake support,
112        slightly modified by me:
113    
114          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
115              not building pcregrep.
116    
117          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
118              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
119    
120    25. Forward references, both numeric and by name, in patterns that made use of
121        duplicate group numbers, could behave incorrectly or give incorrect errors,
122        because when scanning forward to find the reference group, PCRE was not
123        taking into account the duplicate group numbers. A pattern such as
124        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
125    
126    26. Changed a few more instances of "const unsigned char *" to USPTR, making
127        the feature of a custom pointer more persuasive (as requested by a user).
128    
129    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
130        pcretest.c, inside #ifndefs, because it seems they are sometimes already
131        pre-defined.
132    
133    28. Added support for (*UTF8) at the start of a pattern.
134    
135    29. Arrange for flags added by the "release type" setting in CMake to be shown
136        in the configuration summary.
137    
138    
139    Version 7.8 05-Sep-08
140    ---------------------
141    
142    1.  Replaced UCP searching code with optimized version as implemented for Ad
143        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
144        stage table and inline lookup instead of a function, giving speed ups of 2
145        to 5 times on some simple patterns that I tested. Permission was given to
146        distribute the MultiStage2.py script that generates the tables (it's not in
147        the tarball, but is in the Subversion repository).
148    
149    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
150        scripts.
151    
152    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
153        a group with a zero qualifier. The result of the study could be incorrect,
154        or the function might crash, depending on the pattern.
155    
156    4.  Caseless matching was not working for non-ASCII characters in back
157        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
158        It now works when Unicode Property Support is available.
159    
160    5.  In pcretest, an escape such as \x{de} in the data was always generating
161        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
162        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
163        truncation.
164    
165    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
166    
167    7.  Added two (int) casts to pcregrep when printing the difference of two
168        pointers, in case they are 64-bit values.
169    
170    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
171        test 2 if it fails.
172    
173    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
174        and a #define of that name to empty if it is not externally set. This is to
175        allow users of MSVC to set it if necessary.
176    
177    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
178        the convenience functions in the pcre_get.c source file.
179    
180    11. An option change at the start of a pattern that had top-level alternatives
181        could cause overwriting and/or a crash. This command provoked a crash in
182        some environments:
183    
184          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
185    
186        This potential security problem was recorded as CVE-2008-2371.
187    
188    12. For a pattern where the match had to start at the beginning or immediately
189        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
190        pcre_dfa_exec() could read past the end of the passed subject if there was
191        no match. To help with detecting such bugs (e.g. with valgrind), I modified
192        pcretest so that it places the subject at the end of its malloc-ed buffer.
193    
194    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
195        exec() might read past the end of the data buffer in UTF-8 mode.
196    
197    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
198        the data contained the byte 0x85 as part of a UTF-8 character within its
199        first line. This applied both to normal and DFA matching.
200    
201    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
202        /^[^d]*?$/8 failed to match "abc".
203    
204    16. Added a missing copyright notice to pcrecpp_internal.h.
205    
206    17. Make it more clear in the documentation that values returned from
207        pcre_exec() in ovector are byte offsets, not character counts.
208    
209    18. Tidied a few places to stop certain compilers from issuing warnings.
210    
211    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
212        supplied by Stefan Weber. I made a further small update for 7.8 because
213        there is a change of source arrangements: the pcre_searchfuncs.c module is
214        replaced by pcre_ucd.c.
215    
216    
217    Version 7.7 07-May-08
218  ---------------------  ---------------------
219    
220  1.  A class with a very large number of characters with codepoints greater  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
221      than 255 (in UTF-8 mode, of course), caused a buffer overflow.      a string to a long long, pretend we don't even have a long long." This is
222        done by checking for the strtoq, strtoll, and _strtoi64 functions.
223    
224    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
225        pre-7.6 versions, which defined a global no_arg variable instead of putting
226        it in the RE class. (See also #8 below.)
227    
228    3.  Remove a line of dead code, identified by coverity and reported by Nuno
229        Lopes.
230    
231    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
232    
233        (1) The include/exclude patterns were being applied to the whole pathnames
234            of files, instead of just to the final components.
235    
236        (2) If there was more than one level of directory, the subdirectories were
237            skipped unless they satisfied the include/exclude conditions. This is
238            inconsistent with GNU grep (and could even be seen as contrary to the
239            pcregrep specification - which I improved to make it absolutely clear).
240            The action now is always to scan all levels of directory, and just
241            apply the include/exclude patterns to regular files.
242    
243    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
244        --exclude_dir in the tests to avoid scanning .svn directories.
245    
246    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
247        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
248        doesn't support NULs in patterns.
249    
250    7.  Added some missing "const"s to declarations of static tables in
251        pcre_compile.c and pcre_dfa_exec.c.
252    
253    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
254        caused by fix #2  above. (Subsequently also a second patch to fix the
255        first patch. And a third patch - this was a messy problem.)
256    
257    9.  Applied Craig's patch to remove the use of push_back().
258    
259    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
260        matching function regexec().
261    
262    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
263        which, however, unlike Perl's \g{...}, are subroutine calls, not back
264        references. PCRE supports relative numbers with this syntax (I don't think
265        Oniguruma does).
266    
267    12. Previously, a group with a zero repeat such as (...){0} was completely
268        omitted from the compiled regex. However, this means that if the group
269        was called as a subroutine from elsewhere in the pattern, things went wrong
270        (an internal error was given). Such groups are now left in the compiled
271        pattern, with a new opcode that causes them to be skipped at execution
272        time.
273    
274    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
275        to the way PCRE behaves:
276    
277        (a) A lone ] character is dis-allowed (Perl treats it as data).
278    
279        (b) A back reference to an unmatched subpattern matches an empty string
280            (Perl fails the current match path).
281    
282        (c) A data ] in a character class must be notated as \] because if the
283            first data character in a class is ], it defines an empty class. (In
284            Perl it is not possible to have an empty class.) The empty class []
285            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
286            The negative empty class [^] matches any one character, independently
287            of the DOTALL setting.
288    
289    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
290        non-existent subpattern following a character class starting with ']' and
291        containing () gave an internal compiling error instead of "reference to
292        non-existent subpattern". Fortunately, when the pattern did exist, the
293        compiled code was correct. (When scanning forwards to check for the
294        existencd of the subpattern, it was treating the data ']' as terminating
295        the class, so got the count wrong. When actually compiling, the reference
296        was subsequently set up correctly.)
297    
298    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
299        it was being rejected as not supported by pcre_dfa_exec(), even though
300        other assertions are supported. I have made pcre_dfa_exec() support
301        (*FAIL).
302    
303    16. The implementation of 13c above involved the invention of a new opcode,
304        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
305        cannot be changed at match time, I realized I could make a small
306        improvement to matching performance by compiling OP_ALLANY instead of
307        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
308        on the OP_ANY path.
309    
310    17. Compiling pcretest on Windows with readline support failed without the
311        following two fixes: (1) Make the unistd.h include conditional on
312        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
313    
314    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
315        ncurses library to be included for pcretest when ReadLine support is
316        requested, but also to allow for it to be overridden. This patch came from
317        Daniel Bergström.
318    
319    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
320        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
321        any errors with the current Unicode tables. Thanks to Peter Kankowski for
322        spotting this.
323    
324    
325    Version 7.6 28-Jan-08
326    ---------------------
327    
328    1.  A character class containing a very large number of characters with
329        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
330        overflow.
331    
332    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
333        HAVE_LONG_LONG is not defined.
334    
335    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
336        bring them up to date and include new features. This patch includes:
337    
338        - Fixed PH's badly added libz and libbz2 support.
339        - Fixed a problem with static linking.
340        - Added pcredemo. [But later removed - see 7 below.]
341        - Fixed dftables problem and added an option.
342        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
343            HAVE_LONG_LONG.
344        - Added readline support for pcretest.
345        - Added an listing of the option settings after cmake has run.
346    
347    4.  A user submitted a patch to Makefile that makes it easy to create
348        "pcre.dll" under mingw when using Configure/Make. I added stuff to
349        Makefile.am that cause it to include this special target, without
350        affecting anything else. Note that the same mingw target plus all
351        the other distribution libraries and programs are now supported
352        when configuring with CMake (see 6 below) instead of with
353        Configure/Make.
354    
355    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
356        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
357        exported in the Windows port". It has not yet been confirmed that the patch
358        solves the problem, but it does no harm.
359    
360    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
361        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
362        with CMake, and also correct the comment about stack recursion.
363    
364    7.  Remove the automatic building of pcredemo from the ./configure system and
365        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
366        of a program that users should build themselves after PCRE is installed, so
367        building it automatically is not really right. What is more, it gave
368        trouble in some build environments.
369    
370    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
371    
372    
373  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
374  ---------------------  ---------------------

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