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revision 100 by ph10, Tue Mar 6 14:53:10 2007 UTC revision 190 by ph10, Thu Jul 19 10:38:20 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.3 05-Jul-07
5  ---------------------  ---------------------
6    
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. In the rejigging of the build system that eventually resulted in 7.1, the
8      that is more "standard", making use of automake and other autotools. There      line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
9        brackets there is not right, since it causes compilers to look for an
10        installed pcre.h, not the version that is in the source that is being
11        compiled (which of course may be different). I have changed it back to:
12    
13          #include "pcre.h"
14    
15        I have a vague recollection that the change was concerned with compiling in
16        different directories, but in the new build system, that is taken care of
17        by the VPATH setting the Makefile.
18    
19     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
20        when the subject happened to end in the byte 0x85 (e.g. if the last
21        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
22        characters but of course it shouldn't be taken as a newline when it is part
23        of another character. The bug was that, for an unlimited repeat of . in
24        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
25        characters when looking for a newline.
26    
27     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
28    
29    
30    
31    Version 7.2 19-Jun-07
32    ---------------------
33    
34     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
35        which is apparently normally available under Windows.
36    
37     2. Re-jig the pcregrep tests with different newline settings in an attempt
38        to make them independent of the local environment's newline setting.
39    
40     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
41    
42     4. Some of the "internals" tests were previously cut out when the link size
43        was not 2, because the output contained actual offsets. The recent new
44        "Z" feature of pcretest means that these can be cut out, making the tests
45        usable with all link sizes.
46    
47     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
48        stack recursion. This gives a massive performance boost under BSD, but just
49        a small improvement under Linux. However, it saves one field in the frame
50        in all cases.
51    
52     6. Added more features from the forthcoming Perl 5.10:
53    
54        (a) (?-n) (where n is a string of digits) is a relative subroutine or
55            recursion call. It refers to the nth most recently opened parentheses.
56    
57        (b) (?+n) is also a relative subroutine call; it refers to the nth next
58            to be opened parentheses.
59    
60        (c) Conditions that refer to capturing parentheses can be specified
61            relatively, for example, (?(-2)... or (?(+3)...
62    
63        (d) \K resets the start of the current match so that everything before
64            is not part of it.
65    
66        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
67    
68        (f) \g{name} is another synonym - part of Perl 5.10's unification of
69            reference syntax.
70    
71        (g) (?| introduces a group in which the numbering of parentheses in each
72            alternative starts with the same number.
73    
74        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
75    
76     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
77        PCRE_INFO_JCHANGED.
78    
79     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
80        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
81        for detecting groups that can match an empty string.
82    
83     9. A pattern with a very large number of alternatives (more than several
84        hundred) was running out of internal workspace during the pre-compile
85        phase, where pcre_compile() figures out how much memory will be needed. A
86        bit of new cunning has reduced the workspace needed for groups with
87        alternatives. The 1000-alternative test pattern now uses 12 bytes of
88        workspace instead of running out of the 4096 that are available.
89    
90    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
91    
92    11. Applied patch from Google to remove an optimization that didn't quite work.
93        The report of the bug said:
94    
95          pcrecpp::RE("a*").FullMatch("aaa") matches, while
96          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
97          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
98    
99    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
100        it matched the wrong number of bytes.
101    
102    
103    Version 7.1 24-Apr-07
104    ---------------------
105    
106     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
107        that is more "standard", making use of automake and other Autotools. There
108      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
109      on this.      on this.
110    
111   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
112      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
113      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
114      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
115      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
116      alternative.      alternative.
117    
118   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
119      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
120      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
121      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
122      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
123      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
124      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
125      encounters .br or .in.      .br or .in.
126    
127   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
128      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
129      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
130        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
131    
132     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
133        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
134        makevp.bat for the current PCRE, using the additional files
135        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
136    
137     6. A Windows user reported a minor discrepancy with test 2, which turned out
138        to be caused by a trailing space on an input line that had got lost in his
139        copy. The trailing space was an accident, so I've just removed it.
140    
141     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
142        that is needed.
143    
144     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
145        as "const" (a) because they are and (b) because it helps the PHP
146        maintainers who have recently made a script to detect big data structures
147        in the php code that should be moved to the .rodata section. I remembered
148        to update Builducptable as well, so it won't revert if ucptable.h is ever
149        re-created.
150    
151     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
152        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
153        order to be able to cut out the UTF-8 tables in the latter when UTF-8
154        support is not required. This saves 1.5-2K of code, which is important in
155        some applications.
156    
157        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
158        so as not to refer to the tables, even though these functions will never be
159        called when UTF-8 support is disabled. Otherwise there are problems with a
160        shared library.
161    
162    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
163    
164        (a) It was defining its arguments as char * instead of void *.
165    
166        (b) It was assuming that all moves were upwards in memory; this was true
167            a long time ago when I wrote it, but is no longer the case.
168    
169        The emulated memove() is provided for those environments that have neither
170        memmove() nor bcopy(). I didn't think anyone used it these days, but that
171        is clearly not the case, as these two bugs were recently reported.
172    
173    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
174        and Detrail to create the HTML documentation, the .txt form of the man
175        pages, and it removes trailing spaces from listed files. It also creates
176        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
177        case, it wraps all the #defines with #ifndefs. This script should be run
178        before "make dist".
179    
180    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
181        with Unicode property support.
182    
183        (a) For a maximizing quantifier, if the two different cases of the
184            character were of different lengths in their UTF-8 codings (there are
185            some cases like this - I found 11), and the matching function had to
186            back up over a mixture of the two cases, it incorrectly assumed they
187            were both the same length.
188    
189        (b) When PCRE was configured to use the heap rather than the stack for
190            recursion during matching, it was not correctly preserving the data for
191            the other case of a UTF-8 character when checking ahead for a match
192            while processing a minimizing repeat. If the check also involved
193            matching a wide character, but failed, corruption could cause an
194            erroneous result when trying to check for a repeat of the original
195            character.
196    
197    13. Some tidying changes to the testing mechanism:
198    
199        (a) The RunTest script now detects the internal link size and whether there
200            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
201            values substituted by "configure". (The RunGrepTest script already did
202            this for UTF-8.) The configure.ac script no longer substitutes the
203            relevant variables.
204    
205        (b) The debugging options /B and /D in pcretest show the compiled bytecode
206            with length and offset values. This means that the output is different
207            for different internal link sizes. Test 2 is skipped for link sizes
208            other than 2 because of this, bypassing the problem. Unfortunately,
209            there was also a test in test 3 (the locale tests) that used /B and
210            failed for link sizes other than 2. Rather than cut the whole test out,
211            I have added a new /Z option to pcretest that replaces the length and
212            offset values with spaces. This is now used to make test 3 independent
213            of link size. (Test 2 will be tidied up later.)
214    
215    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
216        segmentation fault instead of returning the appropriate error message.
217    
218    15. In multiline mode when the newline sequence was set to "any", the pattern
219        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
220        This doesn't seem right; it now treats the CRLF combination as the line
221        ending, and so does not match in that case. It's only a pattern such as ^$
222        that would hit this one: something like ^ABC$ would have failed after \r
223        and then tried again after \r\n.
224    
225    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
226        in an attempt to make files that differ only in their line terminators
227        compare equal. This works on Linux.
228    
229    17. Under certain error circumstances pcregrep might try to free random memory
230        as it exited. This is now fixed, thanks to valgrind.
231    
232    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
233        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
234        was because its rules for how to advance for /g after matching an empty
235        string at the end of a line did not allow for this case. They now check for
236        it specially.
237    
238    20. pcretest is supposed to handle patterns and data of any length, by
239        extending its buffers when necessary. It was getting this wrong when the
240        buffer for a data line had to be extended.
241    
242    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
243        CRLF as a newline sequence.
244    
245    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
246        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
247        I have nevertheless tidied it up.
248    
249    23. Added some casts to kill warnings from HP-UX ia64 compiler.
250    
251    24. Added a man page for pcre-config.
252    
253    
254  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
255  ---------------------  ---------------------

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