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revision 96 by nigel, Fri Mar 2 13:10:43 2007 UTC revision 192 by ph10, Mon Jul 30 11:23:21 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.
34    Version 7.2 19-Jun-07
35    ---------------------
37     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
38        which is apparently normally available under Windows.
40     2. Re-jig the pcregrep tests with different newline settings in an attempt
41        to make them independent of the local environment's newline setting.
43     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
45     4. Some of the "internals" tests were previously cut out when the link size
46        was not 2, because the output contained actual offsets. The recent new
47        "Z" feature of pcretest means that these can be cut out, making the tests
48        usable with all link sizes.
50     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
51        stack recursion. This gives a massive performance boost under BSD, but just
52        a small improvement under Linux. However, it saves one field in the frame
53        in all cases.
55     6. Added more features from the forthcoming Perl 5.10:
57        (a) (?-n) (where n is a string of digits) is a relative subroutine or
58            recursion call. It refers to the nth most recently opened parentheses.
60        (b) (?+n) is also a relative subroutine call; it refers to the nth next
61            to be opened parentheses.
63        (c) Conditions that refer to capturing parentheses can be specified
64            relatively, for example, (?(-2)... or (?(+3)...
66        (d) \K resets the start of the current match so that everything before
67            is not part of it.
69        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
71        (f) \g{name} is another synonym - part of Perl 5.10's unification of
72            reference syntax.
74        (g) (?| introduces a group in which the numbering of parentheses in each
75            alternative starts with the same number.
77        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
79     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
82     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
83        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
84        for detecting groups that can match an empty string.
86     9. A pattern with a very large number of alternatives (more than several
87        hundred) was running out of internal workspace during the pre-compile
88        phase, where pcre_compile() figures out how much memory will be needed. A
89        bit of new cunning has reduced the workspace needed for groups with
90        alternatives. The 1000-alternative test pattern now uses 12 bytes of
91        workspace instead of running out of the 4096 that are available.
93    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
95    11. Applied patch from Google to remove an optimization that didn't quite work.
96        The report of the bug said:
98          pcrecpp::RE("a*").FullMatch("aaa") matches, while
99          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
100          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
102    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
103        it matched the wrong number of bytes.
106    Version 7.1 24-Apr-07
107    ---------------------
109     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
110        that is more "standard", making use of automake and other Autotools. There
111        is some re-arrangement of the files and adjustment of comments consequent
112        on this.
114     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
115        for recursive directory scanning broke on some systems because the files
116        are not scanned in any specific order and on different systems the order
117        was different. A call to "sort" has been inserted into RunGrepTest for the
118        approprate test as a short-term fix. In the longer term there may be an
119        alternative.
121     3. I had an email from Eric Raymond about problems translating some of PCRE's
122        man pages to HTML (despite the fact that I distribute HTML pages, some
123        people do their own conversions for various reasons). The problems
124        concerned the use of low-level troff macros .br and .in. I have therefore
125        removed all such uses from the man pages (some were redundant, some could
126        be replaced by .nf/.fi pairs). The 132html script that I use to generate
127        HTML has been updated to handle .nf/.fi and to complain if it encounters
128        .br or .in.
130     4. Updated comments in configure.ac that get placed in config.h.in and also
131        arranged for config.h to be included in the distribution, with the name
132        config.h.generic, for the benefit of those who have to compile without
133        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
135     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
136        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
137        makevp.bat for the current PCRE, using the additional files
138        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
140     6. A Windows user reported a minor discrepancy with test 2, which turned out
141        to be caused by a trailing space on an input line that had got lost in his
142        copy. The trailing space was an accident, so I've just removed it.
144     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
145        that is needed.
147     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
148        as "const" (a) because they are and (b) because it helps the PHP
149        maintainers who have recently made a script to detect big data structures
150        in the php code that should be moved to the .rodata section. I remembered
151        to update Builducptable as well, so it won't revert if ucptable.h is ever
152        re-created.
154     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
155        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
156        order to be able to cut out the UTF-8 tables in the latter when UTF-8
157        support is not required. This saves 1.5-2K of code, which is important in
158        some applications.
160        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
161        so as not to refer to the tables, even though these functions will never be
162        called when UTF-8 support is disabled. Otherwise there are problems with a
163        shared library.
165    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
167        (a) It was defining its arguments as char * instead of void *.
169        (b) It was assuming that all moves were upwards in memory; this was true
170            a long time ago when I wrote it, but is no longer the case.
172        The emulated memove() is provided for those environments that have neither
173        memmove() nor bcopy(). I didn't think anyone used it these days, but that
174        is clearly not the case, as these two bugs were recently reported.
176    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
177        and Detrail to create the HTML documentation, the .txt form of the man
178        pages, and it removes trailing spaces from listed files. It also creates
179        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
180        case, it wraps all the #defines with #ifndefs. This script should be run
181        before "make dist".
183    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
184        with Unicode property support.
186        (a) For a maximizing quantifier, if the two different cases of the
187            character were of different lengths in their UTF-8 codings (there are
188            some cases like this - I found 11), and the matching function had to
189            back up over a mixture of the two cases, it incorrectly assumed they
190            were both the same length.
192        (b) When PCRE was configured to use the heap rather than the stack for
193            recursion during matching, it was not correctly preserving the data for
194            the other case of a UTF-8 character when checking ahead for a match
195            while processing a minimizing repeat. If the check also involved
196            matching a wide character, but failed, corruption could cause an
197            erroneous result when trying to check for a repeat of the original
198            character.
200    13. Some tidying changes to the testing mechanism:
202        (a) The RunTest script now detects the internal link size and whether there
203            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
204            values substituted by "configure". (The RunGrepTest script already did
205            this for UTF-8.) The configure.ac script no longer substitutes the
206            relevant variables.
208        (b) The debugging options /B and /D in pcretest show the compiled bytecode
209            with length and offset values. This means that the output is different
210            for different internal link sizes. Test 2 is skipped for link sizes
211            other than 2 because of this, bypassing the problem. Unfortunately,
212            there was also a test in test 3 (the locale tests) that used /B and
213            failed for link sizes other than 2. Rather than cut the whole test out,
214            I have added a new /Z option to pcretest that replaces the length and
215            offset values with spaces. This is now used to make test 3 independent
216            of link size. (Test 2 will be tidied up later.)
218    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
219        segmentation fault instead of returning the appropriate error message.
221    15. In multiline mode when the newline sequence was set to "any", the pattern
222        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
223        This doesn't seem right; it now treats the CRLF combination as the line
224        ending, and so does not match in that case. It's only a pattern such as ^$
225        that would hit this one: something like ^ABC$ would have failed after \r
226        and then tried again after \r\n.
228    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
229        in an attempt to make files that differ only in their line terminators
230        compare equal. This works on Linux.
232    17. Under certain error circumstances pcregrep might try to free random memory
233        as it exited. This is now fixed, thanks to valgrind.
235    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
236        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
237        was because its rules for how to advance for /g after matching an empty
238        string at the end of a line did not allow for this case. They now check for
239        it specially.
241    20. pcretest is supposed to handle patterns and data of any length, by
242        extending its buffers when necessary. It was getting this wrong when the
243        buffer for a data line had to be extended.
245    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
246        CRLF as a newline sequence.
248    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
249        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
250        I have nevertheless tidied it up.
252    23. Added some casts to kill warnings from HP-UX ia64 compiler.
254    24. Added a man page for pcre-config.
257  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
258  ---------------------  ---------------------

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