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revision 101 by ph10, Tue Mar 6 15:19:44 2007 UTC revision 178 by ph10, Wed Jun 13 08:44:34 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        (g) (?| introduces a group in which the numbering of parentheses in each
45            alternative starts with the same number.
46    
47        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
48    
49     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
50        PCRE_INFO_JCHANGED.
51    
52     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
53        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
54        for detecting groups that can match an empty string.
55    
56     9. A pattern with a very large number of alternatives (more than several
57        hundred) was running out of internal workspace during the pre-compile
58        phase, where pcre_compile() figures out how much memory will be needed. A
59        bit of new cunning has reduced the workspace needed for groups with
60        alternatives. The 1000-alternative test pattern now uses 12 bytes of
61        workspace instead of running out of the 4096 that are available.
62    
63    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
64    
65    
66    Version 7.1 24-Apr-07
67    ---------------------
68    
69     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
70        that is more "standard", making use of automake and other Autotools. There
71      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
72      on this.      on this.
73    
74   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
75      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
76      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
77      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
78      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
79      alternative.      alternative.
80    
81   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
82      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
83      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
84      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
85      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
86      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
87      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
88      encounters .br or .in.      .br or .in.
89    
90   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
91      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
92      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
93        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
94   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
95      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
96      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
97      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
98        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
99    
100     6. A Windows user reported a minor discrepancy with test 2, which turned out
101        to be caused by a trailing space on an input line that had got lost in his
102        copy. The trailing space was an accident, so I've just removed it.
103    
104     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
105        that is needed.
106    
107     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
108        as "const" (a) because they are and (b) because it helps the PHP
109        maintainers who have recently made a script to detect big data structures
110        in the php code that should be moved to the .rodata section. I remembered
111        to update Builducptable as well, so it won't revert if ucptable.h is ever
112        re-created.
113    
114     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
115        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
116        order to be able to cut out the UTF-8 tables in the latter when UTF-8
117        support is not required. This saves 1.5-2K of code, which is important in
118        some applications.
119    
120        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
121        so as not to refer to the tables, even though these functions will never be
122        called when UTF-8 support is disabled. Otherwise there are problems with a
123        shared library.
124    
125    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
126    
127        (a) It was defining its arguments as char * instead of void *.
128    
129        (b) It was assuming that all moves were upwards in memory; this was true
130            a long time ago when I wrote it, but is no longer the case.
131    
132        The emulated memove() is provided for those environments that have neither
133        memmove() nor bcopy(). I didn't think anyone used it these days, but that
134        is clearly not the case, as these two bugs were recently reported.
135    
136    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
137        and Detrail to create the HTML documentation, the .txt form of the man
138        pages, and it removes trailing spaces from listed files. It also creates
139        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
140        case, it wraps all the #defines with #ifndefs. This script should be run
141        before "make dist".
142    
143    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
144        with Unicode property support.
145    
146        (a) For a maximizing quantifier, if the two different cases of the
147            character were of different lengths in their UTF-8 codings (there are
148            some cases like this - I found 11), and the matching function had to
149            back up over a mixture of the two cases, it incorrectly assumed they
150            were both the same length.
151    
152        (b) When PCRE was configured to use the heap rather than the stack for
153            recursion during matching, it was not correctly preserving the data for
154            the other case of a UTF-8 character when checking ahead for a match
155            while processing a minimizing repeat. If the check also involved
156            matching a wide character, but failed, corruption could cause an
157            erroneous result when trying to check for a repeat of the original
158            character.
159    
160    13. Some tidying changes to the testing mechanism:
161    
162        (a) The RunTest script now detects the internal link size and whether there
163            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
164            values substituted by "configure". (The RunGrepTest script already did
165            this for UTF-8.) The configure.ac script no longer substitutes the
166            relevant variables.
167    
168        (b) The debugging options /B and /D in pcretest show the compiled bytecode
169            with length and offset values. This means that the output is different
170            for different internal link sizes. Test 2 is skipped for link sizes
171            other than 2 because of this, bypassing the problem. Unfortunately,
172            there was also a test in test 3 (the locale tests) that used /B and
173            failed for link sizes other than 2. Rather than cut the whole test out,
174            I have added a new /Z option to pcretest that replaces the length and
175            offset values with spaces. This is now used to make test 3 independent
176            of link size. (Test 2 will be tidied up later.)
177    
178    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
179        segmentation fault instead of returning the appropriate error message.
180    
181    15. In multiline mode when the newline sequence was set to "any", the pattern
182        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
183        This doesn't seem right; it now treats the CRLF combination as the line
184        ending, and so does not match in that case. It's only a pattern such as ^$
185        that would hit this one: something like ^ABC$ would have failed after \r
186        and then tried again after \r\n.
187    
188    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
189        in an attempt to make files that differ only in their line terminators
190        compare equal. This works on Linux.
191    
192    17. Under certain error circumstances pcregrep might try to free random memory
193        as it exited. This is now fixed, thanks to valgrind.
194    
195    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
196        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
197        was because its rules for how to advance for /g after matching an empty
198        string at the end of a line did not allow for this case. They now check for
199        it specially.
200    
201    20. pcretest is supposed to handle patterns and data of any length, by
202        extending its buffers when necessary. It was getting this wrong when the
203        buffer for a data line had to be extended.
204    
205    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
206        CRLF as a newline sequence.
207    
208    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
209        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
210        I have nevertheless tidied it up.
211    
212    23. Added some casts to kill warnings from HP-UX ia64 compiler.
213    
214    24. Added a man page for pcre-config.
215    
216    
217  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
218  ---------------------  ---------------------

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