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revision 96 by nigel, Fri Mar 2 13:10:43 2007 UTC revision 189 by ph10, Thu Jul 5 11:50:49 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.
21    Version 7.2 19-Jun-07
22    ---------------------
24     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
25        which is apparently normally available under Windows.
27     2. Re-jig the pcregrep tests with different newline settings in an attempt
28        to make them independent of the local environment's newline setting.
30     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
32     4. Some of the "internals" tests were previously cut out when the link size
33        was not 2, because the output contained actual offsets. The recent new
34        "Z" feature of pcretest means that these can be cut out, making the tests
35        usable with all link sizes.
37     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
38        stack recursion. This gives a massive performance boost under BSD, but just
39        a small improvement under Linux. However, it saves one field in the frame
40        in all cases.
42     6. Added more features from the forthcoming Perl 5.10:
44        (a) (?-n) (where n is a string of digits) is a relative subroutine or
45            recursion call. It refers to the nth most recently opened parentheses.
47        (b) (?+n) is also a relative subroutine call; it refers to the nth next
48            to be opened parentheses.
50        (c) Conditions that refer to capturing parentheses can be specified
51            relatively, for example, (?(-2)... or (?(+3)...
53        (d) \K resets the start of the current match so that everything before
54            is not part of it.
56        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
58        (f) \g{name} is another synonym - part of Perl 5.10's unification of
59            reference syntax.
61        (g) (?| introduces a group in which the numbering of parentheses in each
62            alternative starts with the same number.
64        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
66     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
69     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
70        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
71        for detecting groups that can match an empty string.
73     9. A pattern with a very large number of alternatives (more than several
74        hundred) was running out of internal workspace during the pre-compile
75        phase, where pcre_compile() figures out how much memory will be needed. A
76        bit of new cunning has reduced the workspace needed for groups with
77        alternatives. The 1000-alternative test pattern now uses 12 bytes of
78        workspace instead of running out of the 4096 that are available.
80    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
82    11. Applied patch from Google to remove an optimization that didn't quite work.
83        The report of the bug said:
85          pcrecpp::RE("a*").FullMatch("aaa") matches, while
86          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
87          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
89    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
90        it matched the wrong number of bytes.
93    Version 7.1 24-Apr-07
94    ---------------------
96     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
97        that is more "standard", making use of automake and other Autotools. There
98        is some re-arrangement of the files and adjustment of comments consequent
99        on this.
101     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
102        for recursive directory scanning broke on some systems because the files
103        are not scanned in any specific order and on different systems the order
104        was different. A call to "sort" has been inserted into RunGrepTest for the
105        approprate test as a short-term fix. In the longer term there may be an
106        alternative.
108     3. I had an email from Eric Raymond about problems translating some of PCRE's
109        man pages to HTML (despite the fact that I distribute HTML pages, some
110        people do their own conversions for various reasons). The problems
111        concerned the use of low-level troff macros .br and .in. I have therefore
112        removed all such uses from the man pages (some were redundant, some could
113        be replaced by .nf/.fi pairs). The 132html script that I use to generate
114        HTML has been updated to handle .nf/.fi and to complain if it encounters
115        .br or .in.
117     4. Updated comments in configure.ac that get placed in config.h.in and also
118        arranged for config.h to be included in the distribution, with the name
119        config.h.generic, for the benefit of those who have to compile without
120        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
122     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
123        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
124        makevp.bat for the current PCRE, using the additional files
125        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
127     6. A Windows user reported a minor discrepancy with test 2, which turned out
128        to be caused by a trailing space on an input line that had got lost in his
129        copy. The trailing space was an accident, so I've just removed it.
131     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
132        that is needed.
134     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
135        as "const" (a) because they are and (b) because it helps the PHP
136        maintainers who have recently made a script to detect big data structures
137        in the php code that should be moved to the .rodata section. I remembered
138        to update Builducptable as well, so it won't revert if ucptable.h is ever
139        re-created.
141     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
142        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
143        order to be able to cut out the UTF-8 tables in the latter when UTF-8
144        support is not required. This saves 1.5-2K of code, which is important in
145        some applications.
147        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
148        so as not to refer to the tables, even though these functions will never be
149        called when UTF-8 support is disabled. Otherwise there are problems with a
150        shared library.
152    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
154        (a) It was defining its arguments as char * instead of void *.
156        (b) It was assuming that all moves were upwards in memory; this was true
157            a long time ago when I wrote it, but is no longer the case.
159        The emulated memove() is provided for those environments that have neither
160        memmove() nor bcopy(). I didn't think anyone used it these days, but that
161        is clearly not the case, as these two bugs were recently reported.
163    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
164        and Detrail to create the HTML documentation, the .txt form of the man
165        pages, and it removes trailing spaces from listed files. It also creates
166        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
167        case, it wraps all the #defines with #ifndefs. This script should be run
168        before "make dist".
170    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
171        with Unicode property support.
173        (a) For a maximizing quantifier, if the two different cases of the
174            character were of different lengths in their UTF-8 codings (there are
175            some cases like this - I found 11), and the matching function had to
176            back up over a mixture of the two cases, it incorrectly assumed they
177            were both the same length.
179        (b) When PCRE was configured to use the heap rather than the stack for
180            recursion during matching, it was not correctly preserving the data for
181            the other case of a UTF-8 character when checking ahead for a match
182            while processing a minimizing repeat. If the check also involved
183            matching a wide character, but failed, corruption could cause an
184            erroneous result when trying to check for a repeat of the original
185            character.
187    13. Some tidying changes to the testing mechanism:
189        (a) The RunTest script now detects the internal link size and whether there
190            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
191            values substituted by "configure". (The RunGrepTest script already did
192            this for UTF-8.) The configure.ac script no longer substitutes the
193            relevant variables.
195        (b) The debugging options /B and /D in pcretest show the compiled bytecode
196            with length and offset values. This means that the output is different
197            for different internal link sizes. Test 2 is skipped for link sizes
198            other than 2 because of this, bypassing the problem. Unfortunately,
199            there was also a test in test 3 (the locale tests) that used /B and
200            failed for link sizes other than 2. Rather than cut the whole test out,
201            I have added a new /Z option to pcretest that replaces the length and
202            offset values with spaces. This is now used to make test 3 independent
203            of link size. (Test 2 will be tidied up later.)
205    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
206        segmentation fault instead of returning the appropriate error message.
208    15. In multiline mode when the newline sequence was set to "any", the pattern
209        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
210        This doesn't seem right; it now treats the CRLF combination as the line
211        ending, and so does not match in that case. It's only a pattern such as ^$
212        that would hit this one: something like ^ABC$ would have failed after \r
213        and then tried again after \r\n.
215    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
216        in an attempt to make files that differ only in their line terminators
217        compare equal. This works on Linux.
219    17. Under certain error circumstances pcregrep might try to free random memory
220        as it exited. This is now fixed, thanks to valgrind.
222    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
223        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
224        was because its rules for how to advance for /g after matching an empty
225        string at the end of a line did not allow for this case. They now check for
226        it specially.
228    20. pcretest is supposed to handle patterns and data of any length, by
229        extending its buffers when necessary. It was getting this wrong when the
230        buffer for a data line had to be extended.
232    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
233        CRLF as a newline sequence.
235    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
236        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
237        I have nevertheless tidied it up.
239    23. Added some casts to kill warnings from HP-UX ia64 compiler.
241    24. Added a man page for pcre-config.
244  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
245  ---------------------  ---------------------

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