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revision 99 by ph10, Tue Mar 6 12:27:42 2007 UTC revision 203 by ph10, Fri Aug 3 10:09:57 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.1 05-Mar-07  Version 7.3 05-Jul-07
5  ---------------------  ---------------------
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. In the rejigging of the build system that eventually resulted in 7.1, the
8      that is more "standard", making use of automake and other autotools. There      line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
9        brackets there is not right, since it causes compilers to look for an
10        installed pcre.h, not the version that is in the source that is being
11        compiled (which of course may be different). I have changed it back to:
13          #include "pcre.h"
15        I have a vague recollection that the change was concerned with compiling in
16        different directories, but in the new build system, that is taken care of
17        by the VPATH setting the Makefile.
19     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
20        when the subject happened to end in the byte 0x85 (e.g. if the last
21        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
22        characters but of course it shouldn't be taken as a newline when it is part
23        of another character. The bug was that, for an unlimited repeat of . in
24        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
25        characters when looking for a newline.
27     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
29     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
30        in debug output.
32     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
33        long printing in the pcrecpp unittest when running under MinGW.
35     6. ESC_K was left out of the EBCDIC table.
37     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
38        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
39        limit also applies to "virtual nesting" when a pattern is recursive, and in
40        this case 1000 isn't so big. I have been able to remove this limit at the
41        expense of backing off one optimization in certain circumstances. Normally,
42        when pcre_exec() would call its internal match() function recursively and
43        immediately return the result unconditionally, it uses a "tail recursion"
44        feature to save stack. However, when a subpattern that can match an empty
45        string has an unlimited repetition quantifier, it no longer makes this
46        optimization. That gives it a stack frame in which to save the data for
47        checking that an empty string has been matched. Previously this was taken
48        from the 1000-entry workspace that had been reserved. So now there is no
49        explicit limit, but more stack is used.
51     8. Applied Daniel's patches to solve problems with the import/export magic
52        syntax that is required for Windows, and which was going wrong for the
53        pcreposix and pcrecpp parts of the library. These were overlooked when this
54        problem was solved for the main library.
56     9. There were some crude static tests to avoid integer overflow when computing
57        the size of patterns that contain repeated groups with explicit upper
58        limits. As the maximum quantifier is 65535, the maximum group length was
59        set at 30,000 so that the product of these two numbers did not overflow a
60        32-bit integer. However, it turns out that people want to use groups that
61        are longer than 30,000 bytes (though not repeat them that many times).
62        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
63        made it possible to implement the integer overflow checks in a much more
64        dynamic way, which I have now done. The artificial limitation on group
65        length has been removed - we now have only the limit on the total length of
66        the compiled pattern, which depends on the LINK_SIZE setting.
68    10. Fixed a bug in the documentation for get/copy named substring when
69        duplicate names are permitted. If none of the named substrings are set, the
70        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
71        empty string.
74    Version 7.2 19-Jun-07
75    ---------------------
77     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
78        which is apparently normally available under Windows.
80     2. Re-jig the pcregrep tests with different newline settings in an attempt
81        to make them independent of the local environment's newline setting.
83     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
85     4. Some of the "internals" tests were previously cut out when the link size
86        was not 2, because the output contained actual offsets. The recent new
87        "Z" feature of pcretest means that these can be cut out, making the tests
88        usable with all link sizes.
90     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
91        stack recursion. This gives a massive performance boost under BSD, but just
92        a small improvement under Linux. However, it saves one field in the frame
93        in all cases.
95     6. Added more features from the forthcoming Perl 5.10:
97        (a) (?-n) (where n is a string of digits) is a relative subroutine or
98            recursion call. It refers to the nth most recently opened parentheses.
100        (b) (?+n) is also a relative subroutine call; it refers to the nth next
101            to be opened parentheses.
103        (c) Conditions that refer to capturing parentheses can be specified
104            relatively, for example, (?(-2)... or (?(+3)...
106        (d) \K resets the start of the current match so that everything before
107            is not part of it.
109        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
111        (f) \g{name} is another synonym - part of Perl 5.10's unification of
112            reference syntax.
114        (g) (?| introduces a group in which the numbering of parentheses in each
115            alternative starts with the same number.
117        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
119     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
122     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
123        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
124        for detecting groups that can match an empty string.
126     9. A pattern with a very large number of alternatives (more than several
127        hundred) was running out of internal workspace during the pre-compile
128        phase, where pcre_compile() figures out how much memory will be needed. A
129        bit of new cunning has reduced the workspace needed for groups with
130        alternatives. The 1000-alternative test pattern now uses 12 bytes of
131        workspace instead of running out of the 4096 that are available.
133    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
135    11. Applied patch from Google to remove an optimization that didn't quite work.
136        The report of the bug said:
138          pcrecpp::RE("a*").FullMatch("aaa") matches, while
139          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
140          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
142    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
143        it matched the wrong number of bytes.
146    Version 7.1 24-Apr-07
147    ---------------------
149     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
150        that is more "standard", making use of automake and other Autotools. There
151      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
152      on this.      on this.
154   2. I had an email from Eric Raymond about problems translating some of PCRE's   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
155      man pages to HTML (despite the fact that I distribute HTML pages, some      for recursive directory scanning broke on some systems because the files
156      people do their own conversions for various reasons). The problems      are not scanned in any specific order and on different systems the order
157      concerned the use of low-level troff macros .br and .in. I have therefore      was different. A call to "sort" has been inserted into RunGrepTest for the
158      removed all such uses from the man pages (some were redundant, some could      approprate test as a short-term fix. In the longer term there may be an
159      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      alternative.
160      generate HTML has been updated to handle .nf/.fi and to complain if it  
161      encounters .br or .in.   3. I had an email from Eric Raymond about problems translating some of PCRE's
162        man pages to HTML (despite the fact that I distribute HTML pages, some
163        people do their own conversions for various reasons). The problems
164        concerned the use of low-level troff macros .br and .in. I have therefore
165        removed all such uses from the man pages (some were redundant, some could
166        be replaced by .nf/.fi pairs). The 132html script that I use to generate
167        HTML has been updated to handle .nf/.fi and to complain if it encounters
168        .br or .in.
170     4. Updated comments in configure.ac that get placed in config.h.in and also
171        arranged for config.h to be included in the distribution, with the name
172        config.h.generic, for the benefit of those who have to compile without
173        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
175     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
176        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
177        makevp.bat for the current PCRE, using the additional files
178        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
180     6. A Windows user reported a minor discrepancy with test 2, which turned out
181        to be caused by a trailing space on an input line that had got lost in his
182        copy. The trailing space was an accident, so I've just removed it.
184     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
185        that is needed.
187     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
188        as "const" (a) because they are and (b) because it helps the PHP
189        maintainers who have recently made a script to detect big data structures
190        in the php code that should be moved to the .rodata section. I remembered
191        to update Builducptable as well, so it won't revert if ucptable.h is ever
192        re-created.
194     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
195        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
196        order to be able to cut out the UTF-8 tables in the latter when UTF-8
197        support is not required. This saves 1.5-2K of code, which is important in
198        some applications.
200        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
201        so as not to refer to the tables, even though these functions will never be
202        called when UTF-8 support is disabled. Otherwise there are problems with a
203        shared library.
205    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
207        (a) It was defining its arguments as char * instead of void *.
209        (b) It was assuming that all moves were upwards in memory; this was true
210            a long time ago when I wrote it, but is no longer the case.
212        The emulated memove() is provided for those environments that have neither
213        memmove() nor bcopy(). I didn't think anyone used it these days, but that
214        is clearly not the case, as these two bugs were recently reported.
216    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
217        and Detrail to create the HTML documentation, the .txt form of the man
218        pages, and it removes trailing spaces from listed files. It also creates
219        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
220        case, it wraps all the #defines with #ifndefs. This script should be run
221        before "make dist".
223    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
224        with Unicode property support.
226        (a) For a maximizing quantifier, if the two different cases of the
227            character were of different lengths in their UTF-8 codings (there are
228            some cases like this - I found 11), and the matching function had to
229            back up over a mixture of the two cases, it incorrectly assumed they
230            were both the same length.
232        (b) When PCRE was configured to use the heap rather than the stack for
233            recursion during matching, it was not correctly preserving the data for
234            the other case of a UTF-8 character when checking ahead for a match
235            while processing a minimizing repeat. If the check also involved
236            matching a wide character, but failed, corruption could cause an
237            erroneous result when trying to check for a repeat of the original
238            character.
240    13. Some tidying changes to the testing mechanism:
242        (a) The RunTest script now detects the internal link size and whether there
243            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
244            values substituted by "configure". (The RunGrepTest script already did
245            this for UTF-8.) The configure.ac script no longer substitutes the
246            relevant variables.
248        (b) The debugging options /B and /D in pcretest show the compiled bytecode
249            with length and offset values. This means that the output is different
250            for different internal link sizes. Test 2 is skipped for link sizes
251            other than 2 because of this, bypassing the problem. Unfortunately,
252            there was also a test in test 3 (the locale tests) that used /B and
253            failed for link sizes other than 2. Rather than cut the whole test out,
254            I have added a new /Z option to pcretest that replaces the length and
255            offset values with spaces. This is now used to make test 3 independent
256            of link size. (Test 2 will be tidied up later.)
258    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
259        segmentation fault instead of returning the appropriate error message.
261    15. In multiline mode when the newline sequence was set to "any", the pattern
262        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
263        This doesn't seem right; it now treats the CRLF combination as the line
264        ending, and so does not match in that case. It's only a pattern such as ^$
265        that would hit this one: something like ^ABC$ would have failed after \r
266        and then tried again after \r\n.
268    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
269        in an attempt to make files that differ only in their line terminators
270        compare equal. This works on Linux.
272    17. Under certain error circumstances pcregrep might try to free random memory
273        as it exited. This is now fixed, thanks to valgrind.
275    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
276        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
277        was because its rules for how to advance for /g after matching an empty
278        string at the end of a line did not allow for this case. They now check for
279        it specially.
281    20. pcretest is supposed to handle patterns and data of any length, by
282        extending its buffers when necessary. It was getting this wrong when the
283        buffer for a data line had to be extended.
285    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
286        CRLF as a newline sequence.
288    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
289        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
290        I have nevertheless tidied it up.
292    23. Added some casts to kill warnings from HP-UX ia64 compiler.
294    24. Added a man page for pcre-config.
297  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
298  ---------------------  ---------------------

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