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revision 93 by nigel, Sat Feb 24 21:41:42 2007 UTC revision 197 by ph10, Tue Jul 31 10:50:18 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 7.3 05-Jul-07
5    ---------------------
7     1. In the rejigging of the build system that eventually resulted in 7.1, the
8        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" for long printing in the pcrecpp
33        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.
52    Version 7.2 19-Jun-07
53    ---------------------
55     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
56        which is apparently normally available under Windows.
58     2. Re-jig the pcregrep tests with different newline settings in an attempt
59        to make them independent of the local environment's newline setting.
61     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
63     4. Some of the "internals" tests were previously cut out when the link size
64        was not 2, because the output contained actual offsets. The recent new
65        "Z" feature of pcretest means that these can be cut out, making the tests
66        usable with all link sizes.
68     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
69        stack recursion. This gives a massive performance boost under BSD, but just
70        a small improvement under Linux. However, it saves one field in the frame
71        in all cases.
73     6. Added more features from the forthcoming Perl 5.10:
75        (a) (?-n) (where n is a string of digits) is a relative subroutine or
76            recursion call. It refers to the nth most recently opened parentheses.
78        (b) (?+n) is also a relative subroutine call; it refers to the nth next
79            to be opened parentheses.
81        (c) Conditions that refer to capturing parentheses can be specified
82            relatively, for example, (?(-2)... or (?(+3)...
84        (d) \K resets the start of the current match so that everything before
85            is not part of it.
87        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
89        (f) \g{name} is another synonym - part of Perl 5.10's unification of
90            reference syntax.
92        (g) (?| introduces a group in which the numbering of parentheses in each
93            alternative starts with the same number.
95        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
97     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
100     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
101        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
102        for detecting groups that can match an empty string.
104     9. A pattern with a very large number of alternatives (more than several
105        hundred) was running out of internal workspace during the pre-compile
106        phase, where pcre_compile() figures out how much memory will be needed. A
107        bit of new cunning has reduced the workspace needed for groups with
108        alternatives. The 1000-alternative test pattern now uses 12 bytes of
109        workspace instead of running out of the 4096 that are available.
111    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
113    11. Applied patch from Google to remove an optimization that didn't quite work.
114        The report of the bug said:
116          pcrecpp::RE("a*").FullMatch("aaa") matches, while
117          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
118          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
120    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
121        it matched the wrong number of bytes.
124    Version 7.1 24-Apr-07
125    ---------------------
127     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
128        that is more "standard", making use of automake and other Autotools. There
129        is some re-arrangement of the files and adjustment of comments consequent
130        on this.
132     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
133        for recursive directory scanning broke on some systems because the files
134        are not scanned in any specific order and on different systems the order
135        was different. A call to "sort" has been inserted into RunGrepTest for the
136        approprate test as a short-term fix. In the longer term there may be an
137        alternative.
139     3. I had an email from Eric Raymond about problems translating some of PCRE's
140        man pages to HTML (despite the fact that I distribute HTML pages, some
141        people do their own conversions for various reasons). The problems
142        concerned the use of low-level troff macros .br and .in. I have therefore
143        removed all such uses from the man pages (some were redundant, some could
144        be replaced by .nf/.fi pairs). The 132html script that I use to generate
145        HTML has been updated to handle .nf/.fi and to complain if it encounters
146        .br or .in.
148     4. Updated comments in configure.ac that get placed in config.h.in and also
149        arranged for config.h to be included in the distribution, with the name
150        config.h.generic, for the benefit of those who have to compile without
151        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
153     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
154        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
155        makevp.bat for the current PCRE, using the additional files
156        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
158     6. A Windows user reported a minor discrepancy with test 2, which turned out
159        to be caused by a trailing space on an input line that had got lost in his
160        copy. The trailing space was an accident, so I've just removed it.
162     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
163        that is needed.
165     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
166        as "const" (a) because they are and (b) because it helps the PHP
167        maintainers who have recently made a script to detect big data structures
168        in the php code that should be moved to the .rodata section. I remembered
169        to update Builducptable as well, so it won't revert if ucptable.h is ever
170        re-created.
172     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
173        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
174        order to be able to cut out the UTF-8 tables in the latter when UTF-8
175        support is not required. This saves 1.5-2K of code, which is important in
176        some applications.
178        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
179        so as not to refer to the tables, even though these functions will never be
180        called when UTF-8 support is disabled. Otherwise there are problems with a
181        shared library.
183    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
185        (a) It was defining its arguments as char * instead of void *.
187        (b) It was assuming that all moves were upwards in memory; this was true
188            a long time ago when I wrote it, but is no longer the case.
190        The emulated memove() is provided for those environments that have neither
191        memmove() nor bcopy(). I didn't think anyone used it these days, but that
192        is clearly not the case, as these two bugs were recently reported.
194    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
195        and Detrail to create the HTML documentation, the .txt form of the man
196        pages, and it removes trailing spaces from listed files. It also creates
197        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
198        case, it wraps all the #defines with #ifndefs. This script should be run
199        before "make dist".
201    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
202        with Unicode property support.
204        (a) For a maximizing quantifier, if the two different cases of the
205            character were of different lengths in their UTF-8 codings (there are
206            some cases like this - I found 11), and the matching function had to
207            back up over a mixture of the two cases, it incorrectly assumed they
208            were both the same length.
210        (b) When PCRE was configured to use the heap rather than the stack for
211            recursion during matching, it was not correctly preserving the data for
212            the other case of a UTF-8 character when checking ahead for a match
213            while processing a minimizing repeat. If the check also involved
214            matching a wide character, but failed, corruption could cause an
215            erroneous result when trying to check for a repeat of the original
216            character.
218    13. Some tidying changes to the testing mechanism:
220        (a) The RunTest script now detects the internal link size and whether there
221            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
222            values substituted by "configure". (The RunGrepTest script already did
223            this for UTF-8.) The configure.ac script no longer substitutes the
224            relevant variables.
226        (b) The debugging options /B and /D in pcretest show the compiled bytecode
227            with length and offset values. This means that the output is different
228            for different internal link sizes. Test 2 is skipped for link sizes
229            other than 2 because of this, bypassing the problem. Unfortunately,
230            there was also a test in test 3 (the locale tests) that used /B and
231            failed for link sizes other than 2. Rather than cut the whole test out,
232            I have added a new /Z option to pcretest that replaces the length and
233            offset values with spaces. This is now used to make test 3 independent
234            of link size. (Test 2 will be tidied up later.)
236    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
237        segmentation fault instead of returning the appropriate error message.
239    15. In multiline mode when the newline sequence was set to "any", the pattern
240        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
241        This doesn't seem right; it now treats the CRLF combination as the line
242        ending, and so does not match in that case. It's only a pattern such as ^$
243        that would hit this one: something like ^ABC$ would have failed after \r
244        and then tried again after \r\n.
246    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
247        in an attempt to make files that differ only in their line terminators
248        compare equal. This works on Linux.
250    17. Under certain error circumstances pcregrep might try to free random memory
251        as it exited. This is now fixed, thanks to valgrind.
253    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
254        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
255        was because its rules for how to advance for /g after matching an empty
256        string at the end of a line did not allow for this case. They now check for
257        it specially.
259    20. pcretest is supposed to handle patterns and data of any length, by
260        extending its buffers when necessary. It was getting this wrong when the
261        buffer for a data line had to be extended.
263    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
264        CRLF as a newline sequence.
266    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
267        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
268        I have nevertheless tidied it up.
270    23. Added some casts to kill warnings from HP-UX ia64 compiler.
272    24. Added a man page for pcre-config.
275  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
276  ---------------------  ---------------------

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