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revision 366 by ph10, Mon Jul 14 15:45:32 2008 UTC revision 432 by ph10, Wed Sep 2 16:02:56 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.0 02 Jul-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8        was out-of-date, and there was no check on the pcre_compile() error code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    3.  The pcregrep --count option prints the count for each file even when it is
17        zero, as does GNU grep. However, pcregrep was also printing all files when
18        --files-with-matches was added. Now, when both options are given, it prints
19        counts only for those files that have at least one match. (GNU grep just
20        prints the file name in this circumstance, but including the count seems
21        more useful - otherwise, why use --count?) Also ensured that the
22        combination -clh just lists non-zero counts, with no names.
23    
24    4.  The long form of the pcregrep -F option was incorrectly implemented as
25        --fixed_strings instead of --fixed-strings. This is an incompatible change,
26        but it seems right to fix it, and I didn't think it was worth preserving
27        the old behaviour.
28    
29    5.  The command line items --regex=pattern and --regexp=pattern were not
30        recognized by pcregrep, which required --regex pattern or --regexp pattern
31        (with a space rather than an '='). The man page documented the '=' forms,
32        which are compatible with GNU grep; these now work.
33    
34    6.  No libpcreposix.pc file was created for pkg-config; there was just
35        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
36    
37    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
38        when UCP support is not needed, by modifying the Python script that
39        generates it from Unicode data files. This should not matter if the module
40        is correctly used as a library, but I received one complaint about 50K of
41        unwanted data. My guess is that the person linked everything into his
42        program rather than using a library. Anyway, it does no harm.
43    
44    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
45        was a minimum greater than 1 for a wide character in a possessive
46        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
47        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
48        character. Chaos in the form of incorrect output or a compiling loop could
49        result.
50    
51    9.  The restrictions on what a pattern can contain when partial matching is
52        requested for pcre_exec() have been removed. All patterns can now be
53        partially matched by this function. In addition, if there are at least two
54        slots in the offset vector, the offsets of the first-encountered partial
55        match are set in them when PCRE_ERROR_PARTIAL is returned.
56    
57    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
58        synonymous with PCRE_PARTIAL, for backwards compatibility, and
59        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
60        and may be more useful for multi-segment matching, especially with
61        pcre_exec().
62    
63    11. Partial matching with pcre_exec() is now more intuitive. A partial match
64        used to be given if ever the end of the subject was reached; now it is
65        given only if matching could not proceed because another character was
66        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
67        string "Z", which now yields "no match" instead of "partial match". In the
68        case of pcre_dfa_exec(), "no match" is given if every matching path for the
69        final character ended with (*FAIL).
70    
71    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
72        if the pattern had a "must contain" character that was already found in the
73        earlier partial match, unless partial matching was again requested. For
74        example, with the pattern /dog.(body)?/, the "must contain" character is
75        "g". If the first part-match was for the string "dog", restarting with
76        "sbody" failed.
77    
78    13. Added a pcredemo man page, created automatically from the pcredemo.c file,
79        so that the demonstration program is easily available in environments where
80        PCRE has not been installed from source.
81    
82    14. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
83        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
84        library.
85    
86    15. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
87        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
88        is not the first non-POSIX option to be added. Clearly some people find
89        these options useful.
90    
91    
92    Version 7.9 11-Apr-09
93    ---------------------
94    
95    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
96        (pcretest), all targets were linked against these libraries. This included
97        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
98        libraries. This caused unwanted dependencies to be created. This problem
99        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
100        pcretest is linked with readline.
101    
102    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
103        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
104        moved outside it again, because FALSE and TRUE are already defined in AIX,
105        but BOOL is not.
106    
107    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
108        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
109    
110    4.  The pcregrep documentation said spaces were inserted as well as colons (or
111        hyphens) following file names and line numbers when outputting matching
112        lines. This is not true; no spaces are inserted. I have also clarified the
113        wording for the --colour (or --color) option.
114    
115    5.  In pcregrep, when --colour was used with -o, the list of matching strings
116        was not coloured; this is different to GNU grep, so I have changed it to be
117        the same.
118    
119    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
120        each matching line was coloured. Now it goes on to look for further matches
121        of any of the test patterns, which is the same behaviour as GNU grep.
122    
123    7.  A pattern that could match an empty string could cause pcregrep to loop; it
124        doesn't make sense to accept an empty string match in pcregrep, so I have
125        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
126        seems to be how GNU grep behaves.
127    
128    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
129        start or after a newline", because the conditional assertion was not being
130        correctly handled. The rule now is that both the assertion and what follows
131        in the first alternative must satisfy the test.
132    
133    9.  If auto-callout was enabled in a pattern with a conditional group whose
134        condition was an assertion, PCRE could crash during matching, both with
135        pcre_exec() and pcre_dfa_exec().
136    
137    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
138        used for matching.
139    
140    11. Unicode property support in character classes was not working for
141        characters (bytes) greater than 127 when not in UTF-8 mode.
142    
143    12. Added the -M command line option to pcretest.
144    
145    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
146    
147    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
148    
149    16. Added comments and documentation about mis-use of no_arg in the C++
150        wrapper.
151    
152    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
153        from Martin Jerabek that uses macro names for all relevant character and
154        string constants.
155    
156    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
157        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
158        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
159        these, but not everybody uses configure.
160    
161    19. A conditional group that had only one branch was not being correctly
162        recognized as an item that could match an empty string. This meant that an
163        enclosing group might also not be so recognized, causing infinite looping
164        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
165        with the subject "ab", where knowledge that the repeated group can match
166        nothing is needed in order to break the loop.
167    
168    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
169        exec(), but without supplying a callout function, matching went wrong.
170    
171    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
172        leak if the size of the offset vector was greater than 30. When the vector
173        is smaller, the saved offsets during recursion go onto a local stack
174        vector, but for larger vectors malloc() is used. It was failing to free
175        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
176        error, in fact).
177    
178    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
179        heapframe that is used only when UTF-8 support is enabled. This caused no
180        problem, but was untidy.
181    
182    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
183        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
184        included within another project.
185    
186    24. Steven Van Ingelgem's patches to add more options to the CMake support,
187        slightly modified by me:
188    
189          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
190              not building pcregrep.
191    
192          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
193              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
194    
195    25. Forward references, both numeric and by name, in patterns that made use of
196        duplicate group numbers, could behave incorrectly or give incorrect errors,
197        because when scanning forward to find the reference group, PCRE was not
198        taking into account the duplicate group numbers. A pattern such as
199        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
200    
201    26. Changed a few more instances of "const unsigned char *" to USPTR, making
202        the feature of a custom pointer more persuasive (as requested by a user).
203    
204    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
205        pcretest.c, inside #ifndefs, because it seems they are sometimes already
206        pre-defined.
207    
208    28. Added support for (*UTF8) at the start of a pattern.
209    
210    29. Arrange for flags added by the "release type" setting in CMake to be shown
211        in the configuration summary.
212    
213    
214    Version 7.8 05-Sep-08
215  ---------------------  ---------------------
216    
217  1.  Replaced UCP searching code with optimized version as implemented for Ad  1.  Replaced UCP searching code with optimized version as implemented for Ad
# Line 31  Version 8.0 02 Jul-08 Line 241  Version 8.0 02 Jul-08
241    
242  7.  Added two (int) casts to pcregrep when printing the difference of two  7.  Added two (int) casts to pcregrep when printing the difference of two
243      pointers, in case they are 64-bit values.      pointers, in case they are 64-bit values.
244    
245  8.  Added comments about Mac OS X stack usage to the pcrestack man page and to  8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
246      test 2 if it fails.      test 2 if it fails.
247    
248  9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,  9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
249      and a #define of that name to empty if it is not externally set. This is to      and a #define of that name to empty if it is not externally set. This is to
250      allow users of MSVC to set it if necessary.      allow users of MSVC to set it if necessary.
251    
252  10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from  10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
253      the convenience functions in the pcre_get.c source file.      the convenience functions in the pcre_get.c source file.
254    
255  11. An option change at the start of a pattern that had top-level alternatives  11. An option change at the start of a pattern that had top-level alternatives
256      could cause overwriting and/or a crash. This command provoked a crash in      could cause overwriting and/or a crash. This command provoked a crash in
257      some environments:      some environments:
258    
259        printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest        printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
260    
261      This potential security problem was recorded as CVE-2008-2371.      This potential security problem was recorded as CVE-2008-2371.
262    
263  12. For a pattern where the match had to start at the beginning or immediately  12. For a pattern where the match had to start at the beginning or immediately
264      after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and      after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
265      pcre_dfa_exec() could read past the end of the passed subject if there was      pcre_dfa_exec() could read past the end of the passed subject if there was
266      no match. To help with detecting such bugs (e.g. with valgrind), I modified      no match. To help with detecting such bugs (e.g. with valgrind), I modified
267      pcretest so that it places the subject at the end of its malloc-ed buffer.      pcretest so that it places the subject at the end of its malloc-ed buffer.
268    
269  13. The change to pcretest in 12 above threw up a couple more cases when pcre_  13. The change to pcretest in 12 above threw up a couple more cases when pcre_
270      exec() might read past the end of the data buffer in UTF-8 mode.      exec() might read past the end of the data buffer in UTF-8 mode.
271    
272  14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and  14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
273      the data contained the byte 0x85 as part of a UTF-8 character within its      the data contained the byte 0x85 as part of a UTF-8 character within its
274      first line. This applied both to normal and DFA matching.      first line. This applied both to normal and DFA matching.
275    
276  15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,  15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
277      /^[^d]*?$/8 failed to match "abc".      /^[^d]*?$/8 failed to match "abc".
278    
279    16. Added a missing copyright notice to pcrecpp_internal.h.
280    
281    17. Make it more clear in the documentation that values returned from
282        pcre_exec() in ovector are byte offsets, not character counts.
283    
284    18. Tidied a few places to stop certain compilers from issuing warnings.
285    
286    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
287        supplied by Stefan Weber. I made a further small update for 7.8 because
288        there is a change of source arrangements: the pcre_searchfuncs.c module is
289        replaced by pcre_ucd.c.
290    
291    
292  Version 7.7 07-May-08  Version 7.7 07-May-08

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