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revision 113 by ph10, Fri Mar 9 10:13:26 2007 UTC revision 201 by ph10, Thu Aug 2 08:37:31 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. In the rejigging of the build system that eventually resulted in 7.1, the
8        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" and "%I64u" instead of "%llu" for
33        long printing in the pcrecpp unittest when running under MinGW.
34    
35     6. ESC_K was left out of the EBCDIC table.
36    
37     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
38        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
39        limit also applies to "virtual nesting" when a pattern is recursive, and in
40        this case 1000 isn't so big. I have been able to remove this limit at the
41        expense of backing off one optimization in certain circumstances. Normally,
42        when pcre_exec() would call its internal match() function recursively and
43        immediately return the result unconditionally, it uses a "tail recursion"
44        feature to save stack. However, when a subpattern that can match an empty
45        string has an unlimited repetition quantifier, it no longer makes this
46        optimization. That gives it a stack frame in which to save the data for
47        checking that an empty string has been matched. Previously this was taken
48        from the 1000-entry workspace that had been reserved. So now there is no
49        explicit limit, but more stack is used.
50    
51     8. Applied Daniel's patches to solve problems with the import/export magic
52        syntax that is required for Windows, and which was going wrong for the
53        pcreposix and pcrecpp parts of the library. These were overlooked when this
54        problem was solved for the main library.
55    
56    
57    Version 7.2 19-Jun-07
58    ---------------------
59    
60     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
61        which is apparently normally available under Windows.
62    
63     2. Re-jig the pcregrep tests with different newline settings in an attempt
64        to make them independent of the local environment's newline setting.
65    
66     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
67    
68     4. Some of the "internals" tests were previously cut out when the link size
69        was not 2, because the output contained actual offsets. The recent new
70        "Z" feature of pcretest means that these can be cut out, making the tests
71        usable with all link sizes.
72    
73     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
74        stack recursion. This gives a massive performance boost under BSD, but just
75        a small improvement under Linux. However, it saves one field in the frame
76        in all cases.
77    
78     6. Added more features from the forthcoming Perl 5.10:
79    
80        (a) (?-n) (where n is a string of digits) is a relative subroutine or
81            recursion call. It refers to the nth most recently opened parentheses.
82    
83        (b) (?+n) is also a relative subroutine call; it refers to the nth next
84            to be opened parentheses.
85    
86        (c) Conditions that refer to capturing parentheses can be specified
87            relatively, for example, (?(-2)... or (?(+3)...
88    
89        (d) \K resets the start of the current match so that everything before
90            is not part of it.
91    
92        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
93    
94        (f) \g{name} is another synonym - part of Perl 5.10's unification of
95            reference syntax.
96    
97        (g) (?| introduces a group in which the numbering of parentheses in each
98            alternative starts with the same number.
99    
100        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
101    
102     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
103        PCRE_INFO_JCHANGED.
104    
105     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
106        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
107        for detecting groups that can match an empty string.
108    
109     9. A pattern with a very large number of alternatives (more than several
110        hundred) was running out of internal workspace during the pre-compile
111        phase, where pcre_compile() figures out how much memory will be needed. A
112        bit of new cunning has reduced the workspace needed for groups with
113        alternatives. The 1000-alternative test pattern now uses 12 bytes of
114        workspace instead of running out of the 4096 that are available.
115    
116    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
117    
118    11. Applied patch from Google to remove an optimization that didn't quite work.
119        The report of the bug said:
120    
121          pcrecpp::RE("a*").FullMatch("aaa") matches, while
122          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
123          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
124    
125    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
126        it matched the wrong number of bytes.
127    
128    
129    Version 7.1 24-Apr-07
130  ---------------------  ---------------------
131    
132   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
133      that is more "standard", making use of automake and other autotools. There      that is more "standard", making use of automake and other Autotools. There
134      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
135      on this.      on this.
136    
# Line 26  Version 7.1 05-Mar-07 Line 151  Version 7.1 05-Mar-07
151      .br or .in.      .br or .in.
152    
153   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
154      arranged for config.h to be included in the distribution, with the name      arranged for config.h to be included in the distribution, with the name
155      config.h.generic, for the benefit of those who have to compile without      config.h.generic, for the benefit of those who have to compile without
156      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
157    
158   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
159      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
160      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
161      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
162    
163   6. A Windows user reported a minor discrepancy with test 2, which turned out   6. A Windows user reported a minor discrepancy with test 2, which turned out
164      to be caused by a trailing space on an input line that had got lost in his      to be caused by a trailing space on an input line that had got lost in his
# Line 60  Version 7.1 05-Mar-07 Line 185  Version 7.1 05-Mar-07
185      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
186      shared library.      shared library.
187    
188  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:
189      environments that have neither memmove() nor bcopy()) was defining its  
190      arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
191    
192        (b) It was assuming that all moves were upwards in memory; this was true
193            a long time ago when I wrote it, but is no longer the case.
194    
195        The emulated memove() is provided for those environments that have neither
196        memmove() nor bcopy(). I didn't think anyone used it these days, but that
197        is clearly not the case, as these two bugs were recently reported.
198    
199  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
200      and Detrail to create the HTML documentation, the .txt form of the man      and Detrail to create the HTML documentation, the .txt form of the man
201      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
202      pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter      pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
203      case, it wraps all the #defines with #ifndefs. This script should be run      case, it wraps all the #defines with #ifndefs. This script should be run
204      before "make dist".      before "make dist".
205    
206    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
207        with Unicode property support.
208    
209        (a) For a maximizing quantifier, if the two different cases of the
210            character were of different lengths in their UTF-8 codings (there are
211            some cases like this - I found 11), and the matching function had to
212            back up over a mixture of the two cases, it incorrectly assumed they
213            were both the same length.
214    
215        (b) When PCRE was configured to use the heap rather than the stack for
216            recursion during matching, it was not correctly preserving the data for
217            the other case of a UTF-8 character when checking ahead for a match
218            while processing a minimizing repeat. If the check also involved
219            matching a wide character, but failed, corruption could cause an
220            erroneous result when trying to check for a repeat of the original
221            character.
222    
223    13. Some tidying changes to the testing mechanism:
224    
225        (a) The RunTest script now detects the internal link size and whether there
226            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
227            values substituted by "configure". (The RunGrepTest script already did
228            this for UTF-8.) The configure.ac script no longer substitutes the
229            relevant variables.
230    
231        (b) The debugging options /B and /D in pcretest show the compiled bytecode
232            with length and offset values. This means that the output is different
233            for different internal link sizes. Test 2 is skipped for link sizes
234            other than 2 because of this, bypassing the problem. Unfortunately,
235            there was also a test in test 3 (the locale tests) that used /B and
236            failed for link sizes other than 2. Rather than cut the whole test out,
237            I have added a new /Z option to pcretest that replaces the length and
238            offset values with spaces. This is now used to make test 3 independent
239            of link size. (Test 2 will be tidied up later.)
240    
241    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
242        segmentation fault instead of returning the appropriate error message.
243    
244    15. In multiline mode when the newline sequence was set to "any", the pattern
245        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
246        This doesn't seem right; it now treats the CRLF combination as the line
247        ending, and so does not match in that case. It's only a pattern such as ^$
248        that would hit this one: something like ^ABC$ would have failed after \r
249        and then tried again after \r\n.
250    
251    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
252        in an attempt to make files that differ only in their line terminators
253        compare equal. This works on Linux.
254    
255    17. Under certain error circumstances pcregrep might try to free random memory
256        as it exited. This is now fixed, thanks to valgrind.
257    
258    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
259        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
260        was because its rules for how to advance for /g after matching an empty
261        string at the end of a line did not allow for this case. They now check for
262        it specially.
263    
264    20. pcretest is supposed to handle patterns and data of any length, by
265        extending its buffers when necessary. It was getting this wrong when the
266        buffer for a data line had to be extended.
267    
268    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
269        CRLF as a newline sequence.
270    
271    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
272        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
273        I have nevertheless tidied it up.
274    
275    23. Added some casts to kill warnings from HP-UX ia64 compiler.
276    
277    24. Added a man page for pcre-config.
278    
279    
280  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
281  ---------------------  ---------------------

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