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revision 102 by ph10, Tue Mar 6 15:50:45 2007 UTC revision 193 by ph10, Mon Jul 30 11:34:18 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     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
30        in debug output.
31    
32     5. Arrange to use "%I64d" instead of "%lld" for long printing in the pcrecpp
33        unittest when running under MinGW.
34    
35    
36    
37    Version 7.2 19-Jun-07
38    ---------------------
39    
40     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
41        which is apparently normally available under Windows.
42    
43     2. Re-jig the pcregrep tests with different newline settings in an attempt
44        to make them independent of the local environment's newline setting.
45    
46     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
47    
48     4. Some of the "internals" tests were previously cut out when the link size
49        was not 2, because the output contained actual offsets. The recent new
50        "Z" feature of pcretest means that these can be cut out, making the tests
51        usable with all link sizes.
52    
53     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
54        stack recursion. This gives a massive performance boost under BSD, but just
55        a small improvement under Linux. However, it saves one field in the frame
56        in all cases.
57    
58     6. Added more features from the forthcoming Perl 5.10:
59    
60        (a) (?-n) (where n is a string of digits) is a relative subroutine or
61            recursion call. It refers to the nth most recently opened parentheses.
62    
63        (b) (?+n) is also a relative subroutine call; it refers to the nth next
64            to be opened parentheses.
65    
66        (c) Conditions that refer to capturing parentheses can be specified
67            relatively, for example, (?(-2)... or (?(+3)...
68    
69        (d) \K resets the start of the current match so that everything before
70            is not part of it.
71    
72        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
73    
74        (f) \g{name} is another synonym - part of Perl 5.10's unification of
75            reference syntax.
76    
77        (g) (?| introduces a group in which the numbering of parentheses in each
78            alternative starts with the same number.
79    
80        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
81    
82     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
83        PCRE_INFO_JCHANGED.
84    
85     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
86        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
87        for detecting groups that can match an empty string.
88    
89     9. A pattern with a very large number of alternatives (more than several
90        hundred) was running out of internal workspace during the pre-compile
91        phase, where pcre_compile() figures out how much memory will be needed. A
92        bit of new cunning has reduced the workspace needed for groups with
93        alternatives. The 1000-alternative test pattern now uses 12 bytes of
94        workspace instead of running out of the 4096 that are available.
95    
96    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
97    
98    11. Applied patch from Google to remove an optimization that didn't quite work.
99        The report of the bug said:
100    
101          pcrecpp::RE("a*").FullMatch("aaa") matches, while
102          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
103          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
104    
105    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
106        it matched the wrong number of bytes.
107    
108    
109    Version 7.1 24-Apr-07
110    ---------------------
111    
112     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
113        that is more "standard", making use of automake and other Autotools. There
114      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
115      on this.      on this.
116    
117   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
118      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
119      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
120      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
121      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
122      alternative.      alternative.
123    
124   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
125      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
126      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
127      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
128      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
129      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
130      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
131      encounters .br or .in.      .br or .in.
132    
133   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
134      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
135      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
136        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
137   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
138      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
139      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
140      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
141        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
142   6. A Windows user reported a minor discrepancy with test 2, which turned out  
143      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
144        to be caused by a trailing space on an input line that had got lost in his
145      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.
146    
147     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
148        that is needed.
149    
150     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
151        as "const" (a) because they are and (b) because it helps the PHP
152        maintainers who have recently made a script to detect big data structures
153        in the php code that should be moved to the .rodata section. I remembered
154        to update Builducptable as well, so it won't revert if ucptable.h is ever
155        re-created.
156    
157     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
158        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
159        order to be able to cut out the UTF-8 tables in the latter when UTF-8
160        support is not required. This saves 1.5-2K of code, which is important in
161        some applications.
162    
163        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
164        so as not to refer to the tables, even though these functions will never be
165        called when UTF-8 support is disabled. Otherwise there are problems with a
166        shared library.
167    
168    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
169    
170        (a) It was defining its arguments as char * instead of void *.
171    
172        (b) It was assuming that all moves were upwards in memory; this was true
173            a long time ago when I wrote it, but is no longer the case.
174    
175        The emulated memove() is provided for those environments that have neither
176        memmove() nor bcopy(). I didn't think anyone used it these days, but that
177        is clearly not the case, as these two bugs were recently reported.
178    
179    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
180        and Detrail to create the HTML documentation, the .txt form of the man
181        pages, and it removes trailing spaces from listed files. It also creates
182        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
183        case, it wraps all the #defines with #ifndefs. This script should be run
184        before "make dist".
185    
186    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
187        with Unicode property support.
188    
189        (a) For a maximizing quantifier, if the two different cases of the
190            character were of different lengths in their UTF-8 codings (there are
191            some cases like this - I found 11), and the matching function had to
192            back up over a mixture of the two cases, it incorrectly assumed they
193            were both the same length.
194    
195        (b) When PCRE was configured to use the heap rather than the stack for
196            recursion during matching, it was not correctly preserving the data for
197            the other case of a UTF-8 character when checking ahead for a match
198            while processing a minimizing repeat. If the check also involved
199            matching a wide character, but failed, corruption could cause an
200            erroneous result when trying to check for a repeat of the original
201            character.
202    
203    13. Some tidying changes to the testing mechanism:
204    
205        (a) The RunTest script now detects the internal link size and whether there
206            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
207            values substituted by "configure". (The RunGrepTest script already did
208            this for UTF-8.) The configure.ac script no longer substitutes the
209            relevant variables.
210    
211        (b) The debugging options /B and /D in pcretest show the compiled bytecode
212            with length and offset values. This means that the output is different
213            for different internal link sizes. Test 2 is skipped for link sizes
214            other than 2 because of this, bypassing the problem. Unfortunately,
215            there was also a test in test 3 (the locale tests) that used /B and
216            failed for link sizes other than 2. Rather than cut the whole test out,
217            I have added a new /Z option to pcretest that replaces the length and
218            offset values with spaces. This is now used to make test 3 independent
219            of link size. (Test 2 will be tidied up later.)
220    
221    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
222        segmentation fault instead of returning the appropriate error message.
223    
224    15. In multiline mode when the newline sequence was set to "any", the pattern
225        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
226        This doesn't seem right; it now treats the CRLF combination as the line
227        ending, and so does not match in that case. It's only a pattern such as ^$
228        that would hit this one: something like ^ABC$ would have failed after \r
229        and then tried again after \r\n.
230    
231    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
232        in an attempt to make files that differ only in their line terminators
233        compare equal. This works on Linux.
234    
235    17. Under certain error circumstances pcregrep might try to free random memory
236        as it exited. This is now fixed, thanks to valgrind.
237    
238    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
239        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
240        was because its rules for how to advance for /g after matching an empty
241        string at the end of a line did not allow for this case. They now check for
242        it specially.
243    
244    20. pcretest is supposed to handle patterns and data of any length, by
245        extending its buffers when necessary. It was getting this wrong when the
246        buffer for a data line had to be extended.
247    
248    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
249        CRLF as a newline sequence.
250    
251    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
252        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
253        I have nevertheless tidied it up.
254    
255    23. Added some casts to kill warnings from HP-UX ia64 compiler.
256    
257    24. Added a man page for pcre-config.
258    
259    
260  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
261  ---------------------  ---------------------

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