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revision 110 by ph10, Wed Mar 7 16:31:04 2007 UTC revision 171 by ph10, Mon Jun 4 14:28:58 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        (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    
52    Version 7.1 24-Apr-07
53    ---------------------
54    
55     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
56        that is more "standard", making use of automake and other Autotools. There
57      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
58      on this.      on this.
59    
60   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
61      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
62      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
63      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
64      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
65      alternative.      alternative.
66    
67   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
68      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
69      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
70      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
71      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
72      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
73      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
74      encounters .br or .in.      .br or .in.
75    
76   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
77      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
78      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
79        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
80   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
81      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
82      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
83      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
84        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
85   6. A Windows user reported a minor discrepancy with test 2, which turned out  
86      to be caused by a trailing space on an input line that had got lost in his   6. A Windows user reported a minor discrepancy with test 2, which turned out
87        to be caused by a trailing space on an input line that had got lost in his
88      copy. The trailing space was an accident, so I've just removed it.      copy. The trailing space was an accident, so I've just removed it.
89    
90   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
91      that is needed.      that is needed.
92    
93   8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)   8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
94      as "const" (a) because they are and (b) because it helps the PHP      as "const" (a) because they are and (b) because it helps the PHP
95      maintainers who have recently made a script to detect big data structures      maintainers who have recently made a script to detect big data structures
96      in the php code that should be moved to the .rodata section. I remembered      in the php code that should be moved to the .rodata section. I remembered
97      to update Builducptable as well, so it won't revert if ucptable.h is ever      to update Builducptable as well, so it won't revert if ucptable.h is ever
98      re-created.      re-created.
99    
100   9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,   9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
101      pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in      pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
102      order to be able to cut out the UTF-8 tables in the latter when UTF-8      order to be able to cut out the UTF-8 tables in the latter when UTF-8
103      support is not required. This saves 1.5-2K of code, which is important in      support is not required. This saves 1.5-2K of code, which is important in
104      some applications.      some applications.
105    
106      Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c      Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
107      so as not to refer to the tables, even though these functions will never be      so as not to refer to the tables, even though these functions will never be
108      called when UTF-8 support is disabled. Otherwise there are problems with a      called when UTF-8 support is disabled. Otherwise there are problems with a
109      shared library.      shared library.
110    
111  10. The emulated memmove() function in pcre_internal.h (provided for those  10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
112      environments that have neither memmove() nor bcopy()) was defining its  
113      arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
114    
115        (b) It was assuming that all moves were upwards in memory; this was true
116            a long time ago when I wrote it, but is no longer the case.
117    
118        The emulated memove() is provided for those environments that have neither
119        memmove() nor bcopy(). I didn't think anyone used it these days, but that
120        is clearly not the case, as these two bugs were recently reported.
121    
122    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
123        and Detrail to create the HTML documentation, the .txt form of the man
124        pages, and it removes trailing spaces from listed files. It also creates
125        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
126        case, it wraps all the #defines with #ifndefs. This script should be run
127        before "make dist".
128    
129    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
130        with Unicode property support.
131    
132        (a) For a maximizing quantifier, if the two different cases of the
133            character were of different lengths in their UTF-8 codings (there are
134            some cases like this - I found 11), and the matching function had to
135            back up over a mixture of the two cases, it incorrectly assumed they
136            were both the same length.
137    
138        (b) When PCRE was configured to use the heap rather than the stack for
139            recursion during matching, it was not correctly preserving the data for
140            the other case of a UTF-8 character when checking ahead for a match
141            while processing a minimizing repeat. If the check also involved
142            matching a wide character, but failed, corruption could cause an
143            erroneous result when trying to check for a repeat of the original
144            character.
145    
146    13. Some tidying changes to the testing mechanism:
147    
148        (a) The RunTest script now detects the internal link size and whether there
149            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
150            values substituted by "configure". (The RunGrepTest script already did
151            this for UTF-8.) The configure.ac script no longer substitutes the
152            relevant variables.
153    
154        (b) The debugging options /B and /D in pcretest show the compiled bytecode
155            with length and offset values. This means that the output is different
156            for different internal link sizes. Test 2 is skipped for link sizes
157            other than 2 because of this, bypassing the problem. Unfortunately,
158            there was also a test in test 3 (the locale tests) that used /B and
159            failed for link sizes other than 2. Rather than cut the whole test out,
160            I have added a new /Z option to pcretest that replaces the length and
161            offset values with spaces. This is now used to make test 3 independent
162            of link size. (Test 2 will be tidied up later.)
163    
164    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
165        segmentation fault instead of returning the appropriate error message.
166    
167    15. In multiline mode when the newline sequence was set to "any", the pattern
168        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
169        This doesn't seem right; it now treats the CRLF combination as the line
170        ending, and so does not match in that case. It's only a pattern such as ^$
171        that would hit this one: something like ^ABC$ would have failed after \r
172        and then tried again after \r\n.
173    
174    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
175        in an attempt to make files that differ only in their line terminators
176        compare equal. This works on Linux.
177    
178    17. Under certain error circumstances pcregrep might try to free random memory
179        as it exited. This is now fixed, thanks to valgrind.
180    
181    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
182        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
183        was because its rules for how to advance for /g after matching an empty
184        string at the end of a line did not allow for this case. They now check for
185        it specially.
186    
187    20. pcretest is supposed to handle patterns and data of any length, by
188        extending its buffers when necessary. It was getting this wrong when the
189        buffer for a data line had to be extended.
190    
191    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
192        CRLF as a newline sequence.
193    
194    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
195        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
196        I have nevertheless tidied it up.
197    
198    23. Added some casts to kill warnings from HP-UX ia64 compiler.
199    
200    24. Added a man page for pcre-config.
201    
202    
203  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
204  ---------------------  ---------------------

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