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revision 118 by ph10, Fri Mar 9 16:17:46 2007 UTC revision 192 by ph10, Mon Jul 30 11:23:21 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     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    
33    
34    Version 7.2 19-Jun-07
35    ---------------------
36    
37     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
38        which is apparently normally available under Windows.
39    
40     2. Re-jig the pcregrep tests with different newline settings in an attempt
41        to make them independent of the local environment's newline setting.
42    
43     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
44    
45     4. Some of the "internals" tests were previously cut out when the link size
46        was not 2, because the output contained actual offsets. The recent new
47        "Z" feature of pcretest means that these can be cut out, making the tests
48        usable with all link sizes.
49    
50     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
51        stack recursion. This gives a massive performance boost under BSD, but just
52        a small improvement under Linux. However, it saves one field in the frame
53        in all cases.
54    
55     6. Added more features from the forthcoming Perl 5.10:
56    
57        (a) (?-n) (where n is a string of digits) is a relative subroutine or
58            recursion call. It refers to the nth most recently opened parentheses.
59    
60        (b) (?+n) is also a relative subroutine call; it refers to the nth next
61            to be opened parentheses.
62    
63        (c) Conditions that refer to capturing parentheses can be specified
64            relatively, for example, (?(-2)... or (?(+3)...
65    
66        (d) \K resets the start of the current match so that everything before
67            is not part of it.
68    
69        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
70    
71        (f) \g{name} is another synonym - part of Perl 5.10's unification of
72            reference syntax.
73    
74        (g) (?| introduces a group in which the numbering of parentheses in each
75            alternative starts with the same number.
76    
77        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
78    
79     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
80        PCRE_INFO_JCHANGED.
81    
82     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
83        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
84        for detecting groups that can match an empty string.
85    
86     9. A pattern with a very large number of alternatives (more than several
87        hundred) was running out of internal workspace during the pre-compile
88        phase, where pcre_compile() figures out how much memory will be needed. A
89        bit of new cunning has reduced the workspace needed for groups with
90        alternatives. The 1000-alternative test pattern now uses 12 bytes of
91        workspace instead of running out of the 4096 that are available.
92    
93    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
94    
95    11. Applied patch from Google to remove an optimization that didn't quite work.
96        The report of the bug said:
97    
98          pcrecpp::RE("a*").FullMatch("aaa") matches, while
99          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
100          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
101    
102    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
103        it matched the wrong number of bytes.
104    
105    
106    Version 7.1 24-Apr-07
107  ---------------------  ---------------------
108    
109   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
110      that is more "standard", making use of automake and other autotools. There      that is more "standard", making use of automake and other Autotools. There
111      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
112      on this.      on this.
113    
# Line 26  Version 7.1 05-Mar-07 Line 128  Version 7.1 05-Mar-07
128      .br or .in.      .br or .in.
129    
130   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
131      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
132      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
133      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
134    
135   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
136      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
137      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
138      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
139    
140   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
141      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 165  Version 7.1 05-Mar-07
165  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:
166    
167      (a) It was defining its arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
168    
169      (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
170          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.
171    
172      The emulated memove() is provided for those environments that have neither      The emulated memove() is provided for those environments that have neither
173      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
174      is clearly not the case, as these two bugs were recently reported.      is clearly not the case, as these two bugs were recently reported.
175    
176  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
177      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
178      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
179      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
180      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
181      before "make dist".      before "make dist".
182    
183  12. Fixed two fairly obscure bugs concerned with quantified caseless matching  12. Fixed two fairly obscure bugs concerned with quantified caseless matching
184      with Unicode property support.      with Unicode property support.
185    
186      (a) For a maximizing quantifier, if the two different cases of the      (a) For a maximizing quantifier, if the two different cases of the
187          character were of different lengths in their UTF-8 codings (there are          character were of different lengths in their UTF-8 codings (there are
188          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
189          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
190          were both the same length.          were both the same length.
191    
192      (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
193          recursion during matching, it was not correctly preserving the data for          recursion during matching, it was not correctly preserving the data for
194          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
195          while processing a minimizing repeat. If the check also involved          while processing a minimizing repeat. If the check also involved
196          matching a wide character, but failed, corruption could cause an          matching a wide character, but failed, corruption could cause an
197          erroneous result when trying to check for a repeat of the original          erroneous result when trying to check for a repeat of the original
198          character.          character.
199    
200  13. Some tidying changes to the testing mechanism:  13. Some tidying changes to the testing mechanism:
201    
202      (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
203          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
204          values substituted by "configure". (The RunGrepTest script already did          values substituted by "configure". (The RunGrepTest script already did
205          this for UTF-8.) The configure.ac script no longer substitutes the          this for UTF-8.) The configure.ac script no longer substitutes the
206          relevant variables.          relevant variables.
207    
208      (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
209          with length and offset values. This means that the output is different          with length and offset values. This means that the output is different
210          for different internal link sizes. Test 2 is skipped for link sizes          for different internal link sizes. Test 2 is skipped for link sizes
211          other than 2 because of this, bypassing the problem. Unfortunately,          other than 2 because of this, bypassing the problem. Unfortunately,
212          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
213          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,
214          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
215          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
216          of link size.          of link size. (Test 2 will be tidied up later.)
217    
218    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
219        segmentation fault instead of returning the appropriate error message.
220    
221    15. In multiline mode when the newline sequence was set to "any", the pattern
222        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
223        This doesn't seem right; it now treats the CRLF combination as the line
224        ending, and so does not match in that case. It's only a pattern such as ^$
225        that would hit this one: something like ^ABC$ would have failed after \r
226        and then tried again after \r\n.
227    
228    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
229        in an attempt to make files that differ only in their line terminators
230        compare equal. This works on Linux.
231    
232    17. Under certain error circumstances pcregrep might try to free random memory
233        as it exited. This is now fixed, thanks to valgrind.
234    
235    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
236        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
237        was because its rules for how to advance for /g after matching an empty
238        string at the end of a line did not allow for this case. They now check for
239        it specially.
240    
241    20. pcretest is supposed to handle patterns and data of any length, by
242        extending its buffers when necessary. It was getting this wrong when the
243        buffer for a data line had to be extended.
244    
245    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
246        CRLF as a newline sequence.
247    
248    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
249        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
250        I have nevertheless tidied it up.
251    
252    23. Added some casts to kill warnings from HP-UX ia64 compiler.
253    
254    24. Added a man page for pcre-config.
255    
256    
257  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
258  ---------------------  ---------------------

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