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revision 122 by ph10, Mon Mar 12 15:10:25 2007 UTC revision 172 by ph10, Tue Jun 5 10:40:13 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 7.2 05-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     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
45        PCRE_INFO_JCHANGED.
46    
47     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
48        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
49        for detecting groups that can match an empty string.
50    
51     9. A pattern with a very large number of alternatives (more than several
52        hundred) was running out of internal workspace during the pre-compile
53        phase, where pcre_compile() figures out how much memory will be needed. A
54        bit of new cunning has reduced the workspace needed for groups with
55        alternatives. The 1000-alternative test pattern now uses 12 bytes of
56        workspace instead of running out of the 4096 that are available.
57    
58    
59    Version 7.1 24-Apr-07
60  ---------------------  ---------------------
61    
62   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
# Line 26  Version 7.1 12-Mar-07 Line 81  Version 7.1 12-Mar-07
81      .br or .in.      .br or .in.
82    
83   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
84      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
85      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
86      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
87    
88   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
89      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
90      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
91      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
92    
93   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
94      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 63  Version 7.1 12-Mar-07 Line 118  Version 7.1 12-Mar-07
118  10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:  10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
119    
120      (a) It was defining its arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
121    
122      (b) It was assuming that all moves were upwards in memory; this was true      (b) It was assuming that all moves were upwards in memory; this was true
123          a long time ago when I wrote it, but is no longer the case.          a long time ago when I wrote it, but is no longer the case.
124    
125      The emulated memove() is provided for those environments that have neither      The emulated memove() is provided for those environments that have neither
126      memmove() nor bcopy(). I didn't think anyone used it these days, but that      memmove() nor bcopy(). I didn't think anyone used it these days, but that
127      is clearly not the case, as these two bugs were recently reported.      is clearly not the case, as these two bugs were recently reported.
128    
129  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
130      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
131      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
132      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
133      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
134      before "make dist".      before "make dist".
135    
136  12. Fixed two fairly obscure bugs concerned with quantified caseless matching  12. Fixed two fairly obscure bugs concerned with quantified caseless matching
137      with Unicode property support.      with Unicode property support.
138    
139      (a) For a maximizing quantifier, if the two different cases of the      (a) For a maximizing quantifier, if the two different cases of the
140          character were of different lengths in their UTF-8 codings (there are          character were of different lengths in their UTF-8 codings (there are
141          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
142          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
143          were both the same length.          were both the same length.
144    
145      (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
146          recursion during matching, it was not correctly preserving the data for          recursion during matching, it was not correctly preserving the data for
147          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
148          while processing a minimizing repeat. If the check also involved          while processing a minimizing repeat. If the check also involved
149          matching a wide character, but failed, corruption could cause an          matching a wide character, but failed, corruption could cause an
150          erroneous result when trying to check for a repeat of the original          erroneous result when trying to check for a repeat of the original
151          character.          character.
152    
153  13. Some tidying changes to the testing mechanism:  13. Some tidying changes to the testing mechanism:
154    
155      (a) The RunTest script now detects the internal link size and whether there      (a) The RunTest script now detects the internal link size and whether there
156          is UTF-8 and UCP support by running ./pcretest -C instead of relying on          is UTF-8 and UCP support by running ./pcretest -C instead of relying on
157          values substituted by "configure". (The RunGrepTest script already did          values substituted by "configure". (The RunGrepTest script already did
158          this for UTF-8.) The configure.ac script no longer substitutes the          this for UTF-8.) The configure.ac script no longer substitutes the
159          relevant variables.          relevant variables.
160    
161      (b) The debugging options /B and /D in pcretest show the compiled bytecode      (b) The debugging options /B and /D in pcretest show the compiled bytecode
162          with length and offset values. This means that the output is different          with length and offset values. This means that the output is different
163          for different internal link sizes. Test 2 is skipped for link sizes          for different internal link sizes. Test 2 is skipped for link sizes
164          other than 2 because of this, bypassing the problem. Unfortunately,          other than 2 because of this, bypassing the problem. Unfortunately,
165          there was also a test in test 3 (the locale tests) that used /B and          there was also a test in test 3 (the locale tests) that used /B and
166          failed for link sizes other than 2. Rather than cut the whole test out,          failed for link sizes other than 2. Rather than cut the whole test out,
167          I have added a new /Z option to pcretest that replaces the length and          I have added a new /Z option to pcretest that replaces the length and
168          offset values with spaces. This is now used to make test 3 independent          offset values with spaces. This is now used to make test 3 independent
169          of link size. (Test 2 will be tidied up later.)          of link size. (Test 2 will be tidied up later.)
170    
171  14. If erroroffset was passed as NULL to pcre_compile, it provoked a  14. If erroroffset was passed as NULL to pcre_compile, it provoked a
172      segmentation fault instead of returning the appropriate error message.      segmentation fault instead of returning the appropriate error message.
173    
174    15. In multiline mode when the newline sequence was set to "any", the pattern
175        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
176        This doesn't seem right; it now treats the CRLF combination as the line
177        ending, and so does not match in that case. It's only a pattern such as ^$
178        that would hit this one: something like ^ABC$ would have failed after \r
179        and then tried again after \r\n.
180    
181    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
182        in an attempt to make files that differ only in their line terminators
183        compare equal. This works on Linux.
184    
185    17. Under certain error circumstances pcregrep might try to free random memory
186        as it exited. This is now fixed, thanks to valgrind.
187    
188    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
189        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
190        was because its rules for how to advance for /g after matching an empty
191        string at the end of a line did not allow for this case. They now check for
192        it specially.
193    
194    20. pcretest is supposed to handle patterns and data of any length, by
195        extending its buffers when necessary. It was getting this wrong when the
196        buffer for a data line had to be extended.
197    
198    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
199        CRLF as a newline sequence.
200    
201    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
202        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
203        I have nevertheless tidied it up.
204    
205    23. Added some casts to kill warnings from HP-UX ia64 compiler.
206    
207    24. Added a man page for pcre-config.
208    
209    
210  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
211  ---------------------  ---------------------

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