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revision 101 by ph10, Tue Mar 6 15:19:44 2007 UTC revision 172 by ph10, Tue Jun 5 10:40:13 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 05-June-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        (c) Conditions that refer to capturing parentheses can be specified
34            relatively, for example, (?(-2)... or (?(+3)...
35    
36        (d) \K resets the start of the current match so that everything before
37            is not part of it.
38    
39        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
40    
41        (f) \g{name} is another synonym - part of Perl 5.10's unification of
42            reference syntax.
43    
44     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
45        PCRE_INFO_JCHANGED.
46    
47     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
48        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
49        for detecting groups that can match an empty string.
50    
51     9. A pattern with a very large number of alternatives (more than several
52        hundred) was running out of internal workspace during the pre-compile
53        phase, where pcre_compile() figures out how much memory will be needed. A
54        bit of new cunning has reduced the workspace needed for groups with
55        alternatives. The 1000-alternative test pattern now uses 12 bytes of
56        workspace instead of running out of the 4096 that are available.
57    
58    
59    Version 7.1 24-Apr-07
60    ---------------------
61    
62     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
63        that is more "standard", making use of automake and other Autotools. There
64      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
65      on this.      on this.
66    
67   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
68      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
69      are not scanned in any specific order and on different systems the order      are not scanned in any specific order and on different systems the order
70      was different. A call to "sort" has been inserted into RunGrepTest for the      was different. A call to "sort" has been inserted into RunGrepTest for the
71      approprate test as a short-term fix. In the longer term there may be an      approprate test as a short-term fix. In the longer term there may be an
72      alternative.      alternative.
73    
74   3. I had an email from Eric Raymond about problems translating some of PCRE's   3. I had an email from Eric Raymond about problems translating some of PCRE's
75      man pages to HTML (despite the fact that I distribute HTML pages, some      man pages to HTML (despite the fact that I distribute HTML pages, some
76      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
77      concerned the use of low-level troff macros .br and .in. I have therefore      concerned the use of low-level troff macros .br and .in. I have therefore
78      removed all such uses from the man pages (some were redundant, some could      removed all such uses from the man pages (some were redundant, some could
79      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      be replaced by .nf/.fi pairs). The 132html script that I use to generate
80      generate HTML has been updated to handle .nf/.fi and to complain if it      HTML has been updated to handle .nf/.fi and to complain if it encounters
81      encounters .br or .in.      .br or .in.
82    
83   4. Updated comments in configure.ac that get placed in config.h.in and also   4. Updated comments in configure.ac that get placed in config.h.in and also
84      arranged for config.h to be included in the distribution, for the benefit      arranged for config.h to be included in the distribution, with the name
85      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
86        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
87   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
88      Weber: (1) pcre_internal.h was missing some function renames; (2) updated   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
89      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
90      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
91        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
92    
93     6. A Windows user reported a minor discrepancy with test 2, which turned out
94        to be caused by a trailing space on an input line that had got lost in his
95        copy. The trailing space was an accident, so I've just removed it.
96    
97     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
98        that is needed.
99    
100     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
101        as "const" (a) because they are and (b) because it helps the PHP
102        maintainers who have recently made a script to detect big data structures
103        in the php code that should be moved to the .rodata section. I remembered
104        to update Builducptable as well, so it won't revert if ucptable.h is ever
105        re-created.
106    
107     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
108        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
109        order to be able to cut out the UTF-8 tables in the latter when UTF-8
110        support is not required. This saves 1.5-2K of code, which is important in
111        some applications.
112    
113        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
114        so as not to refer to the tables, even though these functions will never be
115        called when UTF-8 support is disabled. Otherwise there are problems with a
116        shared library.
117    
118    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
119    
120        (a) It was defining its arguments as char * instead of void *.
121    
122        (b) It was assuming that all moves were upwards in memory; this was true
123            a long time ago when I wrote it, but is no longer the case.
124    
125        The emulated memove() is provided for those environments that have neither
126        memmove() nor bcopy(). I didn't think anyone used it these days, but that
127        is clearly not the case, as these two bugs were recently reported.
128    
129    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
130        and Detrail to create the HTML documentation, the .txt form of the man
131        pages, and it removes trailing spaces from listed files. It also creates
132        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
133        case, it wraps all the #defines with #ifndefs. This script should be run
134        before "make dist".
135    
136    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
137        with Unicode property support.
138    
139        (a) For a maximizing quantifier, if the two different cases of the
140            character were of different lengths in their UTF-8 codings (there are
141            some cases like this - I found 11), and the matching function had to
142            back up over a mixture of the two cases, it incorrectly assumed they
143            were both the same length.
144    
145        (b) When PCRE was configured to use the heap rather than the stack for
146            recursion during matching, it was not correctly preserving the data for
147            the other case of a UTF-8 character when checking ahead for a match
148            while processing a minimizing repeat. If the check also involved
149            matching a wide character, but failed, corruption could cause an
150            erroneous result when trying to check for a repeat of the original
151            character.
152    
153    13. Some tidying changes to the testing mechanism:
154    
155        (a) The RunTest script now detects the internal link size and whether there
156            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
157            values substituted by "configure". (The RunGrepTest script already did
158            this for UTF-8.) The configure.ac script no longer substitutes the
159            relevant variables.
160    
161        (b) The debugging options /B and /D in pcretest show the compiled bytecode
162            with length and offset values. This means that the output is different
163            for different internal link sizes. Test 2 is skipped for link sizes
164            other than 2 because of this, bypassing the problem. Unfortunately,
165            there was also a test in test 3 (the locale tests) that used /B and
166            failed for link sizes other than 2. Rather than cut the whole test out,
167            I have added a new /Z option to pcretest that replaces the length and
168            offset values with spaces. This is now used to make test 3 independent
169            of link size. (Test 2 will be tidied up later.)
170    
171    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
172        segmentation fault instead of returning the appropriate error message.
173    
174    15. In multiline mode when the newline sequence was set to "any", the pattern
175        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
176        This doesn't seem right; it now treats the CRLF combination as the line
177        ending, and so does not match in that case. It's only a pattern such as ^$
178        that would hit this one: something like ^ABC$ would have failed after \r
179        and then tried again after \r\n.
180    
181    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
182        in an attempt to make files that differ only in their line terminators
183        compare equal. This works on Linux.
184    
185    17. Under certain error circumstances pcregrep might try to free random memory
186        as it exited. This is now fixed, thanks to valgrind.
187    
188    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
189        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
190        was because its rules for how to advance for /g after matching an empty
191        string at the end of a line did not allow for this case. They now check for
192        it specially.
193    
194    20. pcretest is supposed to handle patterns and data of any length, by
195        extending its buffers when necessary. It was getting this wrong when the
196        buffer for a data line had to be extended.
197    
198    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
199        CRLF as a newline sequence.
200    
201    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
202        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
203        I have nevertheless tidied it up.
204    
205    23. Added some casts to kill warnings from HP-UX ia64 compiler.
206    
207    24. Added a man page for pcre-config.
208    
209    
210  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
211  ---------------------  ---------------------

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