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revision 99 by ph10, Tue Mar 6 12:27:42 2007 UTC revision 166 by ph10, Wed May 9 14:48:28 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. There      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     6. Added more features from the forthcoming Perl 5.10:
26    
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.
29    
30        (b) (?+n) is also a relative subroutine call; it refers to the nth next
31            to be opened parentheses.
32    
33    
34    Version 7.1 24-Apr-07
35    ---------------------
36    
37     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
38        that is more "standard", making use of automake and other Autotools. There
39      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
40      on this.      on this.
41    
42   2. I had an email from Eric Raymond about problems translating some of PCRE's   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
43      man pages to HTML (despite the fact that I distribute HTML pages, some      for recursive directory scanning broke on some systems because the files
44      people do their own conversions for various reasons). The problems      are not scanned in any specific order and on different systems the order
45      concerned the use of low-level troff macros .br and .in. I have therefore      was different. A call to "sort" has been inserted into RunGrepTest for the
46      removed all such uses from the man pages (some were redundant, some could      approprate test as a short-term fix. In the longer term there may be an
47      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      alternative.
48      generate HTML has been updated to handle .nf/.fi and to complain if it  
49      encounters .br or .in.   3. I had an email from Eric Raymond about problems translating some of PCRE's
50        man pages to HTML (despite the fact that I distribute HTML pages, some
51        people do their own conversions for various reasons). The problems
52        concerned the use of low-level troff macros .br and .in. I have therefore
53        removed all such uses from the man pages (some were redundant, some could
54        be replaced by .nf/.fi pairs). The 132html script that I use to generate
55        HTML has been updated to handle .nf/.fi and to complain if it encounters
56        .br or .in.
57    
58     4. Updated comments in configure.ac that get placed in config.h.in and also
59        arranged for config.h to be included in the distribution, with the name
60        config.h.generic, for the benefit of those who have to compile without
61        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
62    
63     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
64        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
65        makevp.bat for the current PCRE, using the additional files
66        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
67    
68     6. A Windows user reported a minor discrepancy with test 2, which turned out
69        to be caused by a trailing space on an input line that had got lost in his
70        copy. The trailing space was an accident, so I've just removed it.
71    
72     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
73        that is needed.
74    
75     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
76        as "const" (a) because they are and (b) because it helps the PHP
77        maintainers who have recently made a script to detect big data structures
78        in the php code that should be moved to the .rodata section. I remembered
79        to update Builducptable as well, so it won't revert if ucptable.h is ever
80        re-created.
81    
82     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
83        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
84        order to be able to cut out the UTF-8 tables in the latter when UTF-8
85        support is not required. This saves 1.5-2K of code, which is important in
86        some applications.
87    
88        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
89        so as not to refer to the tables, even though these functions will never be
90        called when UTF-8 support is disabled. Otherwise there are problems with a
91        shared library.
92    
93    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
94    
95        (a) It was defining its arguments as char * instead of void *.
96    
97        (b) It was assuming that all moves were upwards in memory; this was true
98            a long time ago when I wrote it, but is no longer the case.
99    
100        The emulated memove() is provided for those environments that have neither
101        memmove() nor bcopy(). I didn't think anyone used it these days, but that
102        is clearly not the case, as these two bugs were recently reported.
103    
104    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
105        and Detrail to create the HTML documentation, the .txt form of the man
106        pages, and it removes trailing spaces from listed files. It also creates
107        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
108        case, it wraps all the #defines with #ifndefs. This script should be run
109        before "make dist".
110    
111    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
112        with Unicode property support.
113    
114        (a) For a maximizing quantifier, if the two different cases of the
115            character were of different lengths in their UTF-8 codings (there are
116            some cases like this - I found 11), and the matching function had to
117            back up over a mixture of the two cases, it incorrectly assumed they
118            were both the same length.
119    
120        (b) When PCRE was configured to use the heap rather than the stack for
121            recursion during matching, it was not correctly preserving the data for
122            the other case of a UTF-8 character when checking ahead for a match
123            while processing a minimizing repeat. If the check also involved
124            matching a wide character, but failed, corruption could cause an
125            erroneous result when trying to check for a repeat of the original
126            character.
127    
128    13. Some tidying changes to the testing mechanism:
129    
130        (a) The RunTest script now detects the internal link size and whether there
131            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
132            values substituted by "configure". (The RunGrepTest script already did
133            this for UTF-8.) The configure.ac script no longer substitutes the
134            relevant variables.
135    
136        (b) The debugging options /B and /D in pcretest show the compiled bytecode
137            with length and offset values. This means that the output is different
138            for different internal link sizes. Test 2 is skipped for link sizes
139            other than 2 because of this, bypassing the problem. Unfortunately,
140            there was also a test in test 3 (the locale tests) that used /B and
141            failed for link sizes other than 2. Rather than cut the whole test out,
142            I have added a new /Z option to pcretest that replaces the length and
143            offset values with spaces. This is now used to make test 3 independent
144            of link size. (Test 2 will be tidied up later.)
145    
146    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
147        segmentation fault instead of returning the appropriate error message.
148    
149    15. In multiline mode when the newline sequence was set to "any", the pattern
150        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
151        This doesn't seem right; it now treats the CRLF combination as the line
152        ending, and so does not match in that case. It's only a pattern such as ^$
153        that would hit this one: something like ^ABC$ would have failed after \r
154        and then tried again after \r\n.
155    
156    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
157        in an attempt to make files that differ only in their line terminators
158        compare equal. This works on Linux.
159    
160    17. Under certain error circumstances pcregrep might try to free random memory
161        as it exited. This is now fixed, thanks to valgrind.
162    
163    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
164        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
165        was because its rules for how to advance for /g after matching an empty
166        string at the end of a line did not allow for this case. They now check for
167        it specially.
168    
169    20. pcretest is supposed to handle patterns and data of any length, by
170        extending its buffers when necessary. It was getting this wrong when the
171        buffer for a data line had to be extended.
172    
173    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
174        CRLF as a newline sequence.
175    
176    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
177        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
178        I have nevertheless tidied it up.
179    
180    23. Added some casts to kill warnings from HP-UX ia64 compiler.
181    
182    24. Added a man page for pcre-config.
183    
184    
185  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
186  ---------------------  ---------------------

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