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revision 118 by ph10, Fri Mar 9 16:17:46 2007 UTC revision 189 by ph10, Thu Jul 5 11:50:49 2007 UTC
# Line 1  Line 1 
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    
20    
21    Version 7.2 19-Jun-07
22    ---------------------
23    
24     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
25        which is apparently normally available under Windows.
26    
27     2. Re-jig the pcregrep tests with different newline settings in an attempt
28        to make them independent of the local environment's newline setting.
29    
30     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
31    
32     4. Some of the "internals" tests were previously cut out when the link size
33        was not 2, because the output contained actual offsets. The recent new
34        "Z" feature of pcretest means that these can be cut out, making the tests
35        usable with all link sizes.
36    
37     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
38        stack recursion. This gives a massive performance boost under BSD, but just
39        a small improvement under Linux. However, it saves one field in the frame
40        in all cases.
41    
42     6. Added more features from the forthcoming Perl 5.10:
43    
44        (a) (?-n) (where n is a string of digits) is a relative subroutine or
45            recursion call. It refers to the nth most recently opened parentheses.
46    
47        (b) (?+n) is also a relative subroutine call; it refers to the nth next
48            to be opened parentheses.
49    
50        (c) Conditions that refer to capturing parentheses can be specified
51            relatively, for example, (?(-2)... or (?(+3)...
52    
53        (d) \K resets the start of the current match so that everything before
54            is not part of it.
55    
56        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
57    
58        (f) \g{name} is another synonym - part of Perl 5.10's unification of
59            reference syntax.
60    
61        (g) (?| introduces a group in which the numbering of parentheses in each
62            alternative starts with the same number.
63    
64        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
65    
66     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
67        PCRE_INFO_JCHANGED.
68    
69     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
70        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
71        for detecting groups that can match an empty string.
72    
73     9. A pattern with a very large number of alternatives (more than several
74        hundred) was running out of internal workspace during the pre-compile
75        phase, where pcre_compile() figures out how much memory will be needed. A
76        bit of new cunning has reduced the workspace needed for groups with
77        alternatives. The 1000-alternative test pattern now uses 12 bytes of
78        workspace instead of running out of the 4096 that are available.
79    
80    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
81    
82    11. Applied patch from Google to remove an optimization that didn't quite work.
83        The report of the bug said:
84    
85          pcrecpp::RE("a*").FullMatch("aaa") matches, while
86          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
87          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
88    
89    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
90        it matched the wrong number of bytes.
91    
92    
93    Version 7.1 24-Apr-07
94  ---------------------  ---------------------
95    
96   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
97      that is more "standard", making use of automake and other autotools. There      that is more "standard", making use of automake and other Autotools. There
98      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
99      on this.      on this.
100    
# Line 26  Version 7.1 05-Mar-07 Line 115  Version 7.1 05-Mar-07
115      .br or .in.      .br or .in.
116    
117   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
118      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
119      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
120      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
121    
122   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
123      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
124      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
125      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
126    
127   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
128      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 05-Mar-07 Line 152  Version 7.1 05-Mar-07
152  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:
153    
154      (a) It was defining its arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
155    
156      (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
157          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.
158    
159      The emulated memove() is provided for those environments that have neither      The emulated memove() is provided for those environments that have neither
160      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
161      is clearly not the case, as these two bugs were recently reported.      is clearly not the case, as these two bugs were recently reported.
162    
163  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
164      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
165      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
166      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
167      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
168      before "make dist".      before "make dist".
169    
170  12. Fixed two fairly obscure bugs concerned with quantified caseless matching  12. Fixed two fairly obscure bugs concerned with quantified caseless matching
171      with Unicode property support.      with Unicode property support.
172    
173      (a) For a maximizing quantifier, if the two different cases of the      (a) For a maximizing quantifier, if the two different cases of the
174          character were of different lengths in their UTF-8 codings (there are          character were of different lengths in their UTF-8 codings (there are
175          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
176          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
177          were both the same length.          were both the same length.
178    
179      (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
180          recursion during matching, it was not correctly preserving the data for          recursion during matching, it was not correctly preserving the data for
181          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
182          while processing a minimizing repeat. If the check also involved          while processing a minimizing repeat. If the check also involved
183          matching a wide character, but failed, corruption could cause an          matching a wide character, but failed, corruption could cause an
184          erroneous result when trying to check for a repeat of the original          erroneous result when trying to check for a repeat of the original
185          character.          character.
186    
187  13. Some tidying changes to the testing mechanism:  13. Some tidying changes to the testing mechanism:
188    
189      (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
190          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
191          values substituted by "configure". (The RunGrepTest script already did          values substituted by "configure". (The RunGrepTest script already did
192          this for UTF-8.) The configure.ac script no longer substitutes the          this for UTF-8.) The configure.ac script no longer substitutes the
193          relevant variables.          relevant variables.
194    
195      (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
196          with length and offset values. This means that the output is different          with length and offset values. This means that the output is different
197          for different internal link sizes. Test 2 is skipped for link sizes          for different internal link sizes. Test 2 is skipped for link sizes
198          other than 2 because of this, bypassing the problem. Unfortunately,          other than 2 because of this, bypassing the problem. Unfortunately,
199          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
200          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,
201          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
202          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
203          of link size.          of link size. (Test 2 will be tidied up later.)
204    
205    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
206        segmentation fault instead of returning the appropriate error message.
207    
208    15. In multiline mode when the newline sequence was set to "any", the pattern
209        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
210        This doesn't seem right; it now treats the CRLF combination as the line
211        ending, and so does not match in that case. It's only a pattern such as ^$
212        that would hit this one: something like ^ABC$ would have failed after \r
213        and then tried again after \r\n.
214    
215    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
216        in an attempt to make files that differ only in their line terminators
217        compare equal. This works on Linux.
218    
219    17. Under certain error circumstances pcregrep might try to free random memory
220        as it exited. This is now fixed, thanks to valgrind.
221    
222    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
223        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
224        was because its rules for how to advance for /g after matching an empty
225        string at the end of a line did not allow for this case. They now check for
226        it specially.
227    
228    20. pcretest is supposed to handle patterns and data of any length, by
229        extending its buffers when necessary. It was getting this wrong when the
230        buffer for a data line had to be extended.
231    
232    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
233        CRLF as a newline sequence.
234    
235    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
236        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
237        I have nevertheless tidied it up.
238    
239    23. Added some casts to kill warnings from HP-UX ia64 compiler.
240    
241    24. Added a man page for pcre-config.
242    
243    
244  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
245  ---------------------  ---------------------

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