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revision 122 by ph10, Mon Mar 12 15:10:25 2007 UTC revision 195 by ph10, Mon Jul 30 13:23:28 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-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" for long printing in the pcrecpp
33        unittest when running under MinGW.
34    
35     6. ESC_K was left out of the EBCDIC table.
36    
37    
38    
39    Version 7.2 19-Jun-07
40    ---------------------
41    
42     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
43        which is apparently normally available under Windows.
44    
45     2. Re-jig the pcregrep tests with different newline settings in an attempt
46        to make them independent of the local environment's newline setting.
47    
48     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
49    
50     4. Some of the "internals" tests were previously cut out when the link size
51        was not 2, because the output contained actual offsets. The recent new
52        "Z" feature of pcretest means that these can be cut out, making the tests
53        usable with all link sizes.
54    
55     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
56        stack recursion. This gives a massive performance boost under BSD, but just
57        a small improvement under Linux. However, it saves one field in the frame
58        in all cases.
59    
60     6. Added more features from the forthcoming Perl 5.10:
61    
62        (a) (?-n) (where n is a string of digits) is a relative subroutine or
63            recursion call. It refers to the nth most recently opened parentheses.
64    
65        (b) (?+n) is also a relative subroutine call; it refers to the nth next
66            to be opened parentheses.
67    
68        (c) Conditions that refer to capturing parentheses can be specified
69            relatively, for example, (?(-2)... or (?(+3)...
70    
71        (d) \K resets the start of the current match so that everything before
72            is not part of it.
73    
74        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
75    
76        (f) \g{name} is another synonym - part of Perl 5.10's unification of
77            reference syntax.
78    
79        (g) (?| introduces a group in which the numbering of parentheses in each
80            alternative starts with the same number.
81    
82        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
83    
84     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
85        PCRE_INFO_JCHANGED.
86    
87     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
88        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
89        for detecting groups that can match an empty string.
90    
91     9. A pattern with a very large number of alternatives (more than several
92        hundred) was running out of internal workspace during the pre-compile
93        phase, where pcre_compile() figures out how much memory will be needed. A
94        bit of new cunning has reduced the workspace needed for groups with
95        alternatives. The 1000-alternative test pattern now uses 12 bytes of
96        workspace instead of running out of the 4096 that are available.
97    
98    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
99    
100    11. Applied patch from Google to remove an optimization that didn't quite work.
101        The report of the bug said:
102    
103          pcrecpp::RE("a*").FullMatch("aaa") matches, while
104          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
105          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
106    
107    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
108        it matched the wrong number of bytes.
109    
110    
111    Version 7.1 24-Apr-07
112  ---------------------  ---------------------
113    
114   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 133  Version 7.1 12-Mar-07
133      .br or .in.      .br or .in.
134    
135   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
136      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
137      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
138      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
139    
140   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
141      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
142      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
143      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
144    
145   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
146      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 170  Version 7.1 12-Mar-07
170  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:
171    
172      (a) It was defining its arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
173    
174      (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
175          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.
176    
177      The emulated memove() is provided for those environments that have neither      The emulated memove() is provided for those environments that have neither
178      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
179      is clearly not the case, as these two bugs were recently reported.      is clearly not the case, as these two bugs were recently reported.
180    
181  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
182      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
183      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
184      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
185      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
186      before "make dist".      before "make dist".
187    
188  12. Fixed two fairly obscure bugs concerned with quantified caseless matching  12. Fixed two fairly obscure bugs concerned with quantified caseless matching
189      with Unicode property support.      with Unicode property support.
190    
191      (a) For a maximizing quantifier, if the two different cases of the      (a) For a maximizing quantifier, if the two different cases of the
192          character were of different lengths in their UTF-8 codings (there are          character were of different lengths in their UTF-8 codings (there are
193          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
194          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
195          were both the same length.          were both the same length.
196    
197      (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
198          recursion during matching, it was not correctly preserving the data for          recursion during matching, it was not correctly preserving the data for
199          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
200          while processing a minimizing repeat. If the check also involved          while processing a minimizing repeat. If the check also involved
201          matching a wide character, but failed, corruption could cause an          matching a wide character, but failed, corruption could cause an
202          erroneous result when trying to check for a repeat of the original          erroneous result when trying to check for a repeat of the original
203          character.          character.
204    
205  13. Some tidying changes to the testing mechanism:  13. Some tidying changes to the testing mechanism:
206    
207      (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
208          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
209          values substituted by "configure". (The RunGrepTest script already did          values substituted by "configure". (The RunGrepTest script already did
210          this for UTF-8.) The configure.ac script no longer substitutes the          this for UTF-8.) The configure.ac script no longer substitutes the
211          relevant variables.          relevant variables.
212    
213      (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
214          with length and offset values. This means that the output is different          with length and offset values. This means that the output is different
215          for different internal link sizes. Test 2 is skipped for link sizes          for different internal link sizes. Test 2 is skipped for link sizes
216          other than 2 because of this, bypassing the problem. Unfortunately,          other than 2 because of this, bypassing the problem. Unfortunately,
217          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
218          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,
219          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
220          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
221          of link size. (Test 2 will be tidied up later.)          of link size. (Test 2 will be tidied up later.)
222    
223  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
224      segmentation fault instead of returning the appropriate error message.      segmentation fault instead of returning the appropriate error message.
225    
226    15. In multiline mode when the newline sequence was set to "any", the pattern
227        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
228        This doesn't seem right; it now treats the CRLF combination as the line
229        ending, and so does not match in that case. It's only a pattern such as ^$
230        that would hit this one: something like ^ABC$ would have failed after \r
231        and then tried again after \r\n.
232    
233    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
234        in an attempt to make files that differ only in their line terminators
235        compare equal. This works on Linux.
236    
237    17. Under certain error circumstances pcregrep might try to free random memory
238        as it exited. This is now fixed, thanks to valgrind.
239    
240    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
241        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
242        was because its rules for how to advance for /g after matching an empty
243        string at the end of a line did not allow for this case. They now check for
244        it specially.
245    
246    20. pcretest is supposed to handle patterns and data of any length, by
247        extending its buffers when necessary. It was getting this wrong when the
248        buffer for a data line had to be extended.
249    
250    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
251        CRLF as a newline sequence.
252    
253    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
254        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
255        I have nevertheless tidied it up.
256    
257    23. Added some casts to kill warnings from HP-UX ia64 compiler.
258    
259    24. Added a man page for pcre-config.
260    
261    
262  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
263  ---------------------  ---------------------

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