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revision 115 by ph10, Fri Mar 9 12:23:37 2007 UTC revision 182 by ph10, Wed Jun 13 15:09:54 2007 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.2 13-June-07
5    ---------------------
6    
7     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
8        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    11. Applied patch from Google to remove an optimization that didn't quite work.
66        The report of the bug said:
67    
68          pcrecpp::RE("a*").FullMatch("aaa") matches, while
69          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
70          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
71    
72    
73    Version 7.1 24-Apr-07
74  ---------------------  ---------------------
75    
76   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
77      that is more "standard", making use of automake and other autotools. There      that is more "standard", making use of automake and other Autotools. There
78      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
79      on this.      on this.
80    
# Line 26  Version 7.1 05-Mar-07 Line 95  Version 7.1 05-Mar-07
95      .br or .in.      .br or .in.
96    
97   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
98      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
99      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
100      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
101    
102   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
103      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
104      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
105      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
106    
107   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
108      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 129  Version 7.1 05-Mar-07
129      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
130      shared library.      shared library.
131    
132  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:
133      environments that have neither memmove() nor bcopy()) was defining its  
134      arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
135    
136        (b) It was assuming that all moves were upwards in memory; this was true
137            a long time ago when I wrote it, but is no longer the case.
138    
139        The emulated memove() is provided for those environments that have neither
140        memmove() nor bcopy(). I didn't think anyone used it these days, but that
141        is clearly not the case, as these two bugs were recently reported.
142    
143  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
144      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
145      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
146      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
147      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
148      before "make dist".      before "make dist".
149    
150  12. Fixed two fairly obscure bugs concerned with quantified caseless matching  12. Fixed two fairly obscure bugs concerned with quantified caseless matching
151      with Unicode property support.      with Unicode property support.
152    
153      (a) For a maximizing quantifier, if the two different cases of the      (a) For a maximizing quantifier, if the two different cases of the
154          character were of different lengths in their UTF-8 codings (there are          character were of different lengths in their UTF-8 codings (there are
155          some cases like this - I found 11), and the matching function had to          some cases like this - I found 11), and the matching function had to
156          back up over a mixture of the two cases, it incorrectly assumed they          back up over a mixture of the two cases, it incorrectly assumed they
157          were both the same length.          were both the same length.
158    
159      (b) When PCRE was configured to use the heap rather than the stack for      (b) When PCRE was configured to use the heap rather than the stack for
160          recursion during matching, it was not correctly preserving the data for          recursion during matching, it was not correctly preserving the data for
161          the other case of a UTF-8 character when checking ahead for a match          the other case of a UTF-8 character when checking ahead for a match
162          while processing a minimizing repeat. If the check also involved          while processing a minimizing repeat. If the check also involved
163          matching a wide character, but failed, corruption could cause an          matching a wide character, but failed, corruption could cause an
164          erroneous result when trying to check for a repeat of the original          erroneous result when trying to check for a repeat of the original
165          character.          character.
166    
167    13. Some tidying changes to the testing mechanism:
168    
169        (a) The RunTest script now detects the internal link size and whether there
170            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
171            values substituted by "configure". (The RunGrepTest script already did
172            this for UTF-8.) The configure.ac script no longer substitutes the
173            relevant variables.
174    
175        (b) The debugging options /B and /D in pcretest show the compiled bytecode
176            with length and offset values. This means that the output is different
177            for different internal link sizes. Test 2 is skipped for link sizes
178            other than 2 because of this, bypassing the problem. Unfortunately,
179            there was also a test in test 3 (the locale tests) that used /B and
180            failed for link sizes other than 2. Rather than cut the whole test out,
181            I have added a new /Z option to pcretest that replaces the length and
182            offset values with spaces. This is now used to make test 3 independent
183            of link size. (Test 2 will be tidied up later.)
184    
185    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
186        segmentation fault instead of returning the appropriate error message.
187    
188    15. In multiline mode when the newline sequence was set to "any", the pattern
189        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
190        This doesn't seem right; it now treats the CRLF combination as the line
191        ending, and so does not match in that case. It's only a pattern such as ^$
192        that would hit this one: something like ^ABC$ would have failed after \r
193        and then tried again after \r\n.
194    
195    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
196        in an attempt to make files that differ only in their line terminators
197        compare equal. This works on Linux.
198    
199    17. Under certain error circumstances pcregrep might try to free random memory
200        as it exited. This is now fixed, thanks to valgrind.
201    
202    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
203        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
204        was because its rules for how to advance for /g after matching an empty
205        string at the end of a line did not allow for this case. They now check for
206        it specially.
207    
208    20. pcretest is supposed to handle patterns and data of any length, by
209        extending its buffers when necessary. It was getting this wrong when the
210        buffer for a data line had to be extended.
211    
212    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
213        CRLF as a newline sequence.
214    
215    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
216        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
217        I have nevertheless tidied it up.
218    
219    23. Added some casts to kill warnings from HP-UX ia64 compiler.
220    
221    24. Added a man page for pcre-config.
222    
223    
224  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
225  ---------------------  ---------------------

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