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revision 98 by ph10, Mon Mar 5 15:55:02 2007 UTC revision 165 by ph10, Wed May 9 10:50:57 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.2 01-May-07
5  ---------------------  ---------------------
6    
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.
9    
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.
12    
13     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
14    
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.
19    
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.
24    
25    
26    Version 7.1 24-Apr-07
27    ---------------------
28    
29     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
30        that is more "standard", making use of automake and other Autotools. There
31        is some re-arrangement of the files and adjustment of comments consequent
32        on this.
33    
34     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
35        for recursive directory scanning broke on some systems because the files
36        are not scanned in any specific order and on different systems the order
37        was different. A call to "sort" has been inserted into RunGrepTest for the
38        approprate test as a short-term fix. In the longer term there may be an
39        alternative.
40    
41     3. I had an email from Eric Raymond about problems translating some of PCRE's
42        man pages to HTML (despite the fact that I distribute HTML pages, some
43        people do their own conversions for various reasons). The problems
44        concerned the use of low-level troff macros .br and .in. I have therefore
45        removed all such uses from the man pages (some were redundant, some could
46        be replaced by .nf/.fi pairs). The 132html script that I use to generate
47        HTML has been updated to handle .nf/.fi and to complain if it encounters
48        .br or .in.
49    
50     4. Updated comments in configure.ac that get placed in config.h.in and also
51        arranged for config.h to be included in the distribution, with the name
52        config.h.generic, for the benefit of those who have to compile without
53        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
54    
55     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
56        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
57        makevp.bat for the current PCRE, using the additional files
58        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
59    
60     6. A Windows user reported a minor discrepancy with test 2, which turned out
61        to be caused by a trailing space on an input line that had got lost in his
62        copy. The trailing space was an accident, so I've just removed it.
63    
64     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
65        that is needed.
66    
67     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
68        as "const" (a) because they are and (b) because it helps the PHP
69        maintainers who have recently made a script to detect big data structures
70        in the php code that should be moved to the .rodata section. I remembered
71        to update Builducptable as well, so it won't revert if ucptable.h is ever
72        re-created.
73    
74     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
75        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
76        order to be able to cut out the UTF-8 tables in the latter when UTF-8
77        support is not required. This saves 1.5-2K of code, which is important in
78        some applications.
79    
80        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
81        so as not to refer to the tables, even though these functions will never be
82        called when UTF-8 support is disabled. Otherwise there are problems with a
83        shared library.
84    
85    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
86    
87        (a) It was defining its arguments as char * instead of void *.
88    
89        (b) It was assuming that all moves were upwards in memory; this was true
90            a long time ago when I wrote it, but is no longer the case.
91    
92        The emulated memove() is provided for those environments that have neither
93        memmove() nor bcopy(). I didn't think anyone used it these days, but that
94        is clearly not the case, as these two bugs were recently reported.
95    
96    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
97        and Detrail to create the HTML documentation, the .txt form of the man
98        pages, and it removes trailing spaces from listed files. It also creates
99        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
100        case, it wraps all the #defines with #ifndefs. This script should be run
101        before "make dist".
102    
103    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
104        with Unicode property support.
105    
106        (a) For a maximizing quantifier, if the two different cases of the
107            character were of different lengths in their UTF-8 codings (there are
108            some cases like this - I found 11), and the matching function had to
109            back up over a mixture of the two cases, it incorrectly assumed they
110            were both the same length.
111    
112        (b) When PCRE was configured to use the heap rather than the stack for
113            recursion during matching, it was not correctly preserving the data for
114            the other case of a UTF-8 character when checking ahead for a match
115            while processing a minimizing repeat. If the check also involved
116            matching a wide character, but failed, corruption could cause an
117            erroneous result when trying to check for a repeat of the original
118            character.
119    
120    13. Some tidying changes to the testing mechanism:
121    
122        (a) The RunTest script now detects the internal link size and whether there
123            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
124            values substituted by "configure". (The RunGrepTest script already did
125            this for UTF-8.) The configure.ac script no longer substitutes the
126            relevant variables.
127    
128        (b) The debugging options /B and /D in pcretest show the compiled bytecode
129            with length and offset values. This means that the output is different
130            for different internal link sizes. Test 2 is skipped for link sizes
131            other than 2 because of this, bypassing the problem. Unfortunately,
132            there was also a test in test 3 (the locale tests) that used /B and
133            failed for link sizes other than 2. Rather than cut the whole test out,
134            I have added a new /Z option to pcretest that replaces the length and
135            offset values with spaces. This is now used to make test 3 independent
136            of link size. (Test 2 will be tidied up later.)
137    
138    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
139        segmentation fault instead of returning the appropriate error message.
140    
141    15. In multiline mode when the newline sequence was set to "any", the pattern
142        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
143        This doesn't seem right; it now treats the CRLF combination as the line
144        ending, and so does not match in that case. It's only a pattern such as ^$
145        that would hit this one: something like ^ABC$ would have failed after \r
146        and then tried again after \r\n.
147    
148    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
149        in an attempt to make files that differ only in their line terminators
150        compare equal. This works on Linux.
151    
152    17. Under certain error circumstances pcregrep might try to free random memory
153        as it exited. This is now fixed, thanks to valgrind.
154    
155    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
156        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
157        was because its rules for how to advance for /g after matching an empty
158        string at the end of a line did not allow for this case. They now check for
159        it specially.
160    
161    20. pcretest is supposed to handle patterns and data of any length, by
162        extending its buffers when necessary. It was getting this wrong when the
163        buffer for a data line had to be extended.
164    
165    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
166        CRLF as a newline sequence.
167    
168    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
169        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
170        I have nevertheless tidied it up.
171    
172    23. Added some casts to kill warnings from HP-UX ia64 compiler.
173    
174    24. Added a man page for pcre-config.
175    
176    
177  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06

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