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revision 98 by ph10, Mon Mar 5 15:55:02 2007 UTC revision 168 by ph10, Tue May 29 15:18:18 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.1 05-Mar-07  Version 7.2 01-May-07
5  ---------------------  ---------------------
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
8      that is more "standard", making use of automake and other autotools.      which is apparently normally available under Windows.
10     2. Re-jig the pcregrep tests with different newline settings in an attempt
11        to make them independent of the local environment's newline setting.
13     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
15     4. Some of the "internals" tests were previously cut out when the link size
16        was not 2, because the output contained actual offsets. The recent new
17        "Z" feature of pcretest means that these can be cut out, making the tests
18        usable with all link sizes.
20     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
21        stack recursion. This gives a massive performance boost under BSD, but just
22        a small improvement under Linux. However, it saves one field in the frame
23        in all cases.
25     6. Added more features from the forthcoming Perl 5.10:
27        (a) (?-n) (where n is a string of digits) is a relative subroutine or
28            recursion call. It refers to the nth most recently opened parentheses.
30        (b) (?+n) is also a relative subroutine call; it refers to the nth next
31            to be opened parentheses.
33        (c) Conditions that refer to capturing parentheses can be specified
34            relatively, for example, (?(-2)... or (?(+3)...
36        (d) \K resets the start of the current match so that everything before
37            is not part of it.
40    Version 7.1 24-Apr-07
41    ---------------------
43     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
44        that is more "standard", making use of automake and other Autotools. There
45        is some re-arrangement of the files and adjustment of comments consequent
46        on this.
48     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
49        for recursive directory scanning broke on some systems because the files
50        are not scanned in any specific order and on different systems the order
51        was different. A call to "sort" has been inserted into RunGrepTest for the
52        approprate test as a short-term fix. In the longer term there may be an
53        alternative.
55     3. I had an email from Eric Raymond about problems translating some of PCRE's
56        man pages to HTML (despite the fact that I distribute HTML pages, some
57        people do their own conversions for various reasons). The problems
58        concerned the use of low-level troff macros .br and .in. I have therefore
59        removed all such uses from the man pages (some were redundant, some could
60        be replaced by .nf/.fi pairs). The 132html script that I use to generate
61        HTML has been updated to handle .nf/.fi and to complain if it encounters
62        .br or .in.
64     4. Updated comments in configure.ac that get placed in config.h.in and also
65        arranged for config.h to be included in the distribution, with the name
66        config.h.generic, for the benefit of those who have to compile without
67        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
69     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
70        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
71        makevp.bat for the current PCRE, using the additional files
72        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
74     6. A Windows user reported a minor discrepancy with test 2, which turned out
75        to be caused by a trailing space on an input line that had got lost in his
76        copy. The trailing space was an accident, so I've just removed it.
78     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
79        that is needed.
81     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
82        as "const" (a) because they are and (b) because it helps the PHP
83        maintainers who have recently made a script to detect big data structures
84        in the php code that should be moved to the .rodata section. I remembered
85        to update Builducptable as well, so it won't revert if ucptable.h is ever
86        re-created.
88     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
89        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
90        order to be able to cut out the UTF-8 tables in the latter when UTF-8
91        support is not required. This saves 1.5-2K of code, which is important in
92        some applications.
94        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
95        so as not to refer to the tables, even though these functions will never be
96        called when UTF-8 support is disabled. Otherwise there are problems with a
97        shared library.
99    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
101        (a) It was defining its arguments as char * instead of void *.
103        (b) It was assuming that all moves were upwards in memory; this was true
104            a long time ago when I wrote it, but is no longer the case.
106        The emulated memove() is provided for those environments that have neither
107        memmove() nor bcopy(). I didn't think anyone used it these days, but that
108        is clearly not the case, as these two bugs were recently reported.
110    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
111        and Detrail to create the HTML documentation, the .txt form of the man
112        pages, and it removes trailing spaces from listed files. It also creates
113        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
114        case, it wraps all the #defines with #ifndefs. This script should be run
115        before "make dist".
117    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
118        with Unicode property support.
120        (a) For a maximizing quantifier, if the two different cases of the
121            character were of different lengths in their UTF-8 codings (there are
122            some cases like this - I found 11), and the matching function had to
123            back up over a mixture of the two cases, it incorrectly assumed they
124            were both the same length.
126        (b) When PCRE was configured to use the heap rather than the stack for
127            recursion during matching, it was not correctly preserving the data for
128            the other case of a UTF-8 character when checking ahead for a match
129            while processing a minimizing repeat. If the check also involved
130            matching a wide character, but failed, corruption could cause an
131            erroneous result when trying to check for a repeat of the original
132            character.
134    13. Some tidying changes to the testing mechanism:
136        (a) The RunTest script now detects the internal link size and whether there
137            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
138            values substituted by "configure". (The RunGrepTest script already did
139            this for UTF-8.) The configure.ac script no longer substitutes the
140            relevant variables.
142        (b) The debugging options /B and /D in pcretest show the compiled bytecode
143            with length and offset values. This means that the output is different
144            for different internal link sizes. Test 2 is skipped for link sizes
145            other than 2 because of this, bypassing the problem. Unfortunately,
146            there was also a test in test 3 (the locale tests) that used /B and
147            failed for link sizes other than 2. Rather than cut the whole test out,
148            I have added a new /Z option to pcretest that replaces the length and
149            offset values with spaces. This is now used to make test 3 independent
150            of link size. (Test 2 will be tidied up later.)
152    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
153        segmentation fault instead of returning the appropriate error message.
155    15. In multiline mode when the newline sequence was set to "any", the pattern
156        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
157        This doesn't seem right; it now treats the CRLF combination as the line
158        ending, and so does not match in that case. It's only a pattern such as ^$
159        that would hit this one: something like ^ABC$ would have failed after \r
160        and then tried again after \r\n.
162    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
163        in an attempt to make files that differ only in their line terminators
164        compare equal. This works on Linux.
166    17. Under certain error circumstances pcregrep might try to free random memory
167        as it exited. This is now fixed, thanks to valgrind.
169    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
170        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
171        was because its rules for how to advance for /g after matching an empty
172        string at the end of a line did not allow for this case. They now check for
173        it specially.
175    20. pcretest is supposed to handle patterns and data of any length, by
176        extending its buffers when necessary. It was getting this wrong when the
177        buffer for a data line had to be extended.
179    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
180        CRLF as a newline sequence.
182    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
183        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
184        I have nevertheless tidied it up.
186    23. Added some casts to kill warnings from HP-UX ia64 compiler.
188    24. Added a man page for pcre-config.
191  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06

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