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revision 105 by ph10, Tue Mar 6 16:32:53 2007 UTC revision 323 by ph10, Wed Mar 5 17:23:42 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.7 05-Mar-08
5  ---------------------  ---------------------
6    
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
8      that is more "standard", making use of automake and other autotools. There      a string to a long long, pretend we don't even have a long long." This is
9        done by checking for the strtoq, strtoll, and _strtoi64 functions.
10    
11    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
12        pre-7.6 versions, which defined a global no_arg variable instead of putting
13        it in the RE class.
14    
15    3.  Remove a line of dead code, identified by coverity and reported by Nuno
16        Lopes.
17    
18    
19    Version 7.6 28-Jan-08
20    ---------------------
21    
22    1.  A character class containing a very large number of characters with
23        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
24        overflow.
25    
26    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
27        HAVE_LONG_LONG is not defined.
28    
29    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
30        bring them up to date and include new features. This patch includes:
31    
32        - Fixed PH's badly added libz and libbz2 support.
33        - Fixed a problem with static linking.
34        - Added pcredemo. [But later removed - see 7 below.]
35        - Fixed dftables problem and added an option.
36        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
37            HAVE_LONG_LONG.
38        - Added readline support for pcretest.
39        - Added an listing of the option settings after cmake has run.
40    
41    4.  A user submitted a patch to Makefile that makes it easy to create
42        "pcre.dll" under mingw when using Configure/Make. I added stuff to
43        Makefile.am that cause it to include this special target, without
44        affecting anything else. Note that the same mingw target plus all
45        the other distribution libraries and programs are now supported
46        when configuring with CMake (see 6 below) instead of with
47        Configure/Make.
48    
49    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
50        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
51        exported in the Windows port". It has not yet been confirmed that the patch
52        solves the problem, but it does no harm.
53    
54    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
55        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
56        with CMake, and also correct the comment about stack recursion.
57    
58    7.  Remove the automatic building of pcredemo from the ./configure system and
59        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
60        of a program that users should build themselves after PCRE is installed, so
61        building it automatically is not really right. What is more, it gave
62        trouble in some build environments.
63    
64    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
65    
66    
67    Version 7.5 10-Jan-08
68    ---------------------
69    
70    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
71        values in parens when parsing an RE using the C++ wrapper."
72    
73    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
74        Characters greater than 255 were excluded from the class instead of being
75        included.
76    
77    3.  The same bug as (2) above applied to negated POSIX classes such as
78        [:^space:].
79    
80    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
81        defined or documented. It seems to have been a typo for PCRE_STATIC, so
82        I have changed it.
83    
84    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
85        first named subpattern) and a construct such as (?&a) would reference the
86        first named subpattern whose name started with "a" (in other words, the
87        length check was missing). Both these problems are fixed. "Subpattern name
88        expected" is now given for (?&) (a zero-length name), and this patch also
89        makes it give the same error for \k'' (previously it complained that that
90        was a reference to a non-existent subpattern).
91    
92    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
93        this is right because (?- can be followed by option settings as well as by
94        digits. I have, however, made the messages clearer.
95    
96    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
97        than the number used in the conditional) now cause a compile-time error.
98        This is actually not compatible with Perl, which accepts such patterns, but
99        treats the conditional as always being FALSE (as PCRE used to), but it
100        seems to me that giving a diagnostic is better.
101    
102    8.  Change "alphameric" to the more common word "alphanumeric" in comments
103        and messages.
104    
105    9.  Fix two occurrences of "backslash" in comments that should have been
106        "backspace".
107    
108    10. Remove two redundant lines of code that can never be obeyed (their function
109        was moved elsewhere).
110    
111    11. The program that makes PCRE's Unicode character property table had a bug
112        which caused it to generate incorrect table entries for sequences of
113        characters that have the same character type, but are in different scripts.
114        It amalgamated them into a single range, with the script of the first of
115        them. In other words, some characters were in the wrong script. There were
116        thirteen such cases, affecting characters in the following ranges:
117    
118          U+002b0 - U+002c1
119          U+0060c - U+0060d
120          U+0061e - U+00612
121          U+0064b - U+0065e
122          U+0074d - U+0076d
123          U+01800 - U+01805
124          U+01d00 - U+01d77
125          U+01d9b - U+01dbf
126          U+0200b - U+0200f
127          U+030fc - U+030fe
128          U+03260 - U+0327f
129          U+0fb46 - U+0fbb1
130          U+10450 - U+1049d
131    
132    12. The -o option (show only the matching part of a line) for pcregrep was not
133        compatible with GNU grep in that, if there was more than one match in a
134        line, it showed only the first of them. It now behaves in the same way as
135        GNU grep.
136    
137    13. If the -o and -v options were combined for pcregrep, it printed a blank
138        line for every non-matching line. GNU grep prints nothing, and pcregrep now
139        does the same. The return code can be used to tell if there were any
140        non-matching lines.
141    
142    14. Added --file-offsets and --line-offsets to pcregrep.
143    
144    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
145        infinitely looping recursion. The bug was that positive lookaheads were not
146        being skipped when checking for a possible empty match (negative lookaheads
147        and both kinds of lookbehind were skipped).
148    
149    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
150        inclusion of <windows.h> to before rather than after the definition of
151        INVALID_FILE_ATTRIBUTES (patch from David Byron).
152    
153    17. Specifying a possessive quantifier with a specific limit for a Unicode
154        character property caused pcre_compile() to compile bad code, which led at
155        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
156        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
157        caused the error; without that there was no problem.
158    
159    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
160    
161    19. Added --enable-pcretest-libreadline.
162    
163    20. In pcrecpp.cc, the variable 'count' was incremented twice in
164        RE::GlobalReplace(). As a result, the number of replacements returned was
165        double what it should be. I removed one of the increments, but Craig sent a
166        later patch that removed the other one (the right fix) and added unit tests
167        that check the return values (which was not done before).
168    
169    21. Several CMake things:
170    
171        (1) Arranged that, when cmake is used on Unix, the libraries end up with
172            the names libpcre and libpcreposix, not just pcre and pcreposix.
173    
174        (2) The above change means that pcretest and pcregrep are now correctly
175            linked with the newly-built libraries, not previously installed ones.
176    
177        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
178    
179    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
180        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
181        UTF-8 newline character). The key issue is that the pattern starts .*;
182        this means that the match must be either at the beginning, or after a
183        newline. The bug was in the code for advancing after a failed match and
184        checking that the new position followed a newline. It was not taking
185        account of UTF-8 characters correctly.
186    
187    23. PCRE was behaving differently from Perl in the way it recognized POSIX
188        character classes. PCRE was not treating the sequence [:...:] as a
189        character class unless the ... were all letters. Perl, however, seems to
190        allow any characters between [: and :], though of course it rejects as
191        unknown any "names" that contain non-letters, because all the known class
192        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
193        for example, whereas PCRE did not - it did not recognize a POSIX character
194        class. This seemed a bit dangerous, so the code has been changed to be
195        closer to Perl. The behaviour is not identical to Perl, because PCRE will
196        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
197        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
198        Perl does, and where it didn't before.
199    
200    24. Rewrite so as to remove the single use of %n from pcregrep because in some
201        Windows environments %n is disabled by default.
202    
203    
204    Version 7.4 21-Sep-07
205    ---------------------
206    
207    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
208        means that a class such as [\s] counted as "explicit reference to CR or
209        LF". That isn't really right - the whole point of the change was to try to
210        help when there was an actual mention of one of the two characters. So now
211        the change happens only if \r or \n (or a literal CR or LF) character is
212        encountered.
213    
214    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
215        of both had grown to the point where there were only 3 bits left.
216        Fortunately, there was spare space in the data structure, and so I have
217        moved the internal flags into a new 16-bit field to free up more option
218        bits.
219    
220    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
221        but did not set the internal JCHANGED flag - either of these is enough to
222        control the way the "get" function works - but the PCRE_INFO_JCHANGED
223        facility is supposed to tell if (?J) was ever used, so now (?J) at the
224        start sets both bits.
225    
226    4.  Added options (at build time, compile time, exec time) to change \R from
227        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
228    
229    5.  doc/pcresyntax.html was missing from the distribution.
230    
231    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
232        compatibility, even though it is no longer used.
233    
234    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
235        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
236        windows.h file is present (where different names are used). [This was
237        reversed later after testing - see 16 below.]
238    
239    8.  Changed all #include <config.h> to #include "config.h". There were also
240        some further <pcre.h> cases that I changed to "pcre.h".
241    
242    9.  When pcregrep was used with the --colour option, it missed the line ending
243        sequence off the lines that it output.
244    
245    10. It was pointed out to me that arrays of string pointers cause lots of
246        relocations when a shared library is dynamically loaded. A technique of
247        using a single long string with a table of offsets can drastically reduce
248        these. I have refactored PCRE in four places to do this. The result is
249        dramatic:
250    
251          Originally:                          290
252          After changing UCP table:            187
253          After changing error message table:   43
254          After changing table of "verbs"       36
255          After changing table of Posix names   22
256    
257        Thanks to the folks working on Gregex for glib for this insight.
258    
259    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
260        unicode-properties was also set.
261    
262    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
263    
264    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
265        checked only for CRLF.
266    
267    14. Added casts to pcretest.c to avoid compiler warnings.
268    
269    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
270    
271    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
272        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
273        entirely. This removes changes made in 7 above.
274    
275    17. The CMake files have been updated, and there is now more information about
276        building with CMake in the NON-UNIX-USE document.
277    
278    
279    Version 7.3 28-Aug-07
280    ---------------------
281    
282     1. In the rejigging of the build system that eventually resulted in 7.1, the
283        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
284        brackets there is not right, since it causes compilers to look for an
285        installed pcre.h, not the version that is in the source that is being
286        compiled (which of course may be different). I have changed it back to:
287    
288          #include "pcre.h"
289    
290        I have a vague recollection that the change was concerned with compiling in
291        different directories, but in the new build system, that is taken care of
292        by the VPATH setting the Makefile.
293    
294     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
295        when the subject happened to end in the byte 0x85 (e.g. if the last
296        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
297        characters but of course it shouldn't be taken as a newline when it is part
298        of another character. The bug was that, for an unlimited repeat of . in
299        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
300        characters when looking for a newline.
301    
302     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
303    
304     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
305        in debug output.
306    
307     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
308        long printing in the pcrecpp unittest when running under MinGW.
309    
310     6. ESC_K was left out of the EBCDIC table.
311    
312     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
313        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
314        limit also applies to "virtual nesting" when a pattern is recursive, and in
315        this case 1000 isn't so big. I have been able to remove this limit at the
316        expense of backing off one optimization in certain circumstances. Normally,
317        when pcre_exec() would call its internal match() function recursively and
318        immediately return the result unconditionally, it uses a "tail recursion"
319        feature to save stack. However, when a subpattern that can match an empty
320        string has an unlimited repetition quantifier, it no longer makes this
321        optimization. That gives it a stack frame in which to save the data for
322        checking that an empty string has been matched. Previously this was taken
323        from the 1000-entry workspace that had been reserved. So now there is no
324        explicit limit, but more stack is used.
325    
326     8. Applied Daniel's patches to solve problems with the import/export magic
327        syntax that is required for Windows, and which was going wrong for the
328        pcreposix and pcrecpp parts of the library. These were overlooked when this
329        problem was solved for the main library.
330    
331     9. There were some crude static tests to avoid integer overflow when computing
332        the size of patterns that contain repeated groups with explicit upper
333        limits. As the maximum quantifier is 65535, the maximum group length was
334        set at 30,000 so that the product of these two numbers did not overflow a
335        32-bit integer. However, it turns out that people want to use groups that
336        are longer than 30,000 bytes (though not repeat them that many times).
337        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
338        made it possible to implement the integer overflow checks in a much more
339        dynamic way, which I have now done. The artificial limitation on group
340        length has been removed - we now have only the limit on the total length of
341        the compiled pattern, which depends on the LINK_SIZE setting.
342    
343    10. Fixed a bug in the documentation for get/copy named substring when
344        duplicate names are permitted. If none of the named substrings are set, the
345        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
346        empty string.
347    
348    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
349        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
350        because the ] is interpreted as the first data character and the
351        terminating ] is not found. PCRE has been made compatible with Perl in this
352        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
353        cause memory overwriting.
354    
355    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
356        string has been matched (to stop an infinite loop). It was not recognizing
357        a conditional subpattern that could match an empty string if that
358        subpattern was within another subpattern. For example, it looped when
359        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
360        condition was not nested. This bug has been fixed.
361    
362    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
363        past the start of the subject in the presence of bytes with the top bit
364        set, for example "\x8aBCD".
365    
366    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
367        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
368    
369    14. Optimized (?!) to (*FAIL).
370    
371    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
372        This restricts code points to be within the range 0 to 0x10FFFF, excluding
373        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
374        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
375        does: it's just the validity check that is more restrictive.
376    
377    16. Inserted checks for integer overflows during escape sequence (backslash)
378        processing, and also fixed erroneous offset values for syntax errors during
379        backslash processing.
380    
381    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
382        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
383    
384    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
385        caused an overrun.
386    
387    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
388        something other than just ASCII characters) inside a group that had an
389        unlimited repeat caused a loop at compile time (while checking to see
390        whether the group could match an empty string).
391    
392    20. Debugging a pattern containing \p or \P could cause a crash. For example,
393        [\P{Any}] did so. (Error in the code for printing property names.)
394    
395    21. An orphan \E inside a character class could cause a crash.
396    
397    22. A repeated capturing bracket such as (A)? could cause a wild memory
398        reference during compilation.
399    
400    23. There are several functions in pcre_compile() that scan along a compiled
401        expression for various reasons (e.g. to see if it's fixed length for look
402        behind). There were bugs in these functions when a repeated \p or \P was
403        present in the pattern. These operators have additional parameters compared
404        with \d, etc, and these were not being taken into account when moving along
405        the compiled data. Specifically:
406    
407        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
408            length.
409    
410        (b) An item such as \pL+ within a repeated group could cause crashes or
411            loops.
412    
413        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
414            "reference to non-existent subpattern" error.
415    
416        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
417    
418    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
419        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
420    
421    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
422    
423    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
424        character were causing crashes (broken optimization).
425    
426    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
427        \p or \P) caused a compile-time loop.
428    
429    28. More problems have arisen in unanchored patterns when CRLF is a valid line
430        break. For example, the unstudied pattern [\r\n]A does not match the string
431        "\r\nA" because change 7.0/46 below moves the current point on by two
432        characters after failing to match at the start. However, the pattern \nA
433        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
434        the same is true. There doesn't seem any very clean way out of this, but
435        what I have chosen to do makes the common cases work: PCRE now takes note
436        of whether there can be an explicit match for \r or \n anywhere in the
437        pattern, and if so, 7.0/46 no longer applies. As part of this change,
438        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
439        pattern has explicit CR or LF references.
440    
441    29. Added (*CR) etc for changing newline setting at start of pattern.
442    
443    
444    Version 7.2 19-Jun-07
445    ---------------------
446    
447     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
448        which is apparently normally available under Windows.
449    
450     2. Re-jig the pcregrep tests with different newline settings in an attempt
451        to make them independent of the local environment's newline setting.
452    
453     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
454    
455     4. Some of the "internals" tests were previously cut out when the link size
456        was not 2, because the output contained actual offsets. The recent new
457        "Z" feature of pcretest means that these can be cut out, making the tests
458        usable with all link sizes.
459    
460     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
461        stack recursion. This gives a massive performance boost under BSD, but just
462        a small improvement under Linux. However, it saves one field in the frame
463        in all cases.
464    
465     6. Added more features from the forthcoming Perl 5.10:
466    
467        (a) (?-n) (where n is a string of digits) is a relative subroutine or
468            recursion call. It refers to the nth most recently opened parentheses.
469    
470        (b) (?+n) is also a relative subroutine call; it refers to the nth next
471            to be opened parentheses.
472    
473        (c) Conditions that refer to capturing parentheses can be specified
474            relatively, for example, (?(-2)... or (?(+3)...
475    
476        (d) \K resets the start of the current match so that everything before
477            is not part of it.
478    
479        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
480    
481        (f) \g{name} is another synonym - part of Perl 5.10's unification of
482            reference syntax.
483    
484        (g) (?| introduces a group in which the numbering of parentheses in each
485            alternative starts with the same number.
486    
487        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
488    
489     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
490        PCRE_INFO_JCHANGED.
491    
492     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
493        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
494        for detecting groups that can match an empty string.
495    
496     9. A pattern with a very large number of alternatives (more than several
497        hundred) was running out of internal workspace during the pre-compile
498        phase, where pcre_compile() figures out how much memory will be needed. A
499        bit of new cunning has reduced the workspace needed for groups with
500        alternatives. The 1000-alternative test pattern now uses 12 bytes of
501        workspace instead of running out of the 4096 that are available.
502    
503    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
504    
505    11. Applied patch from Google to remove an optimization that didn't quite work.
506        The report of the bug said:
507    
508          pcrecpp::RE("a*").FullMatch("aaa") matches, while
509          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
510          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
511    
512    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
513        it matched the wrong number of bytes.
514    
515    
516    Version 7.1 24-Apr-07
517    ---------------------
518    
519     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
520        that is more "standard", making use of automake and other Autotools. There
521      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
522      on this.      on this.
523    
524   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
525      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
526      are not scanned in any specific order and on different systems the order      are not scanned in any specific order and on different systems the order
527      was different. A call to "sort" has been inserted into RunGrepTest for the      was different. A call to "sort" has been inserted into RunGrepTest for the
528      approprate test as a short-term fix. In the longer term there may be an      approprate test as a short-term fix. In the longer term there may be an
529      alternative.      alternative.
530    
531   3. I had an email from Eric Raymond about problems translating some of PCRE's   3. I had an email from Eric Raymond about problems translating some of PCRE's
532      man pages to HTML (despite the fact that I distribute HTML pages, some      man pages to HTML (despite the fact that I distribute HTML pages, some
533      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
534      concerned the use of low-level troff macros .br and .in. I have therefore      concerned the use of low-level troff macros .br and .in. I have therefore
535      removed all such uses from the man pages (some were redundant, some could      removed all such uses from the man pages (some were redundant, some could
536      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      be replaced by .nf/.fi pairs). The 132html script that I use to generate
537      generate HTML has been updated to handle .nf/.fi and to complain if it      HTML has been updated to handle .nf/.fi and to complain if it encounters
538      encounters .br or .in.      .br or .in.
539    
540   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
541      arranged for config.h to be included in the distribution, for the benefit      arranged for config.h to be included in the distribution, with the name
542      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
543        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
544   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
545      Weber: (1) pcre_internal.h was missing some function renames; (2) updated   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
546      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
547      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
548        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
549   6. A Windows user reported a minor discrepancy with test 2, which turned out  
550      to be caused by a trailing space on an input line that had got lost in his   6. A Windows user reported a minor discrepancy with test 2, which turned out
551        to be caused by a trailing space on an input line that had got lost in his
552      copy. The trailing space was an accident, so I've just removed it.      copy. The trailing space was an accident, so I've just removed it.
553    
554   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
555      that is needed.      that is needed.
556    
557   8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)   8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
558      as "const" (a) because they are and (b) because it helps the PHP      as "const" (a) because they are and (b) because it helps the PHP
559      maintainers who have recently made a script to detect big data structures      maintainers who have recently made a script to detect big data structures
560      in the php code that should be moved to the .rodata section. I remembered      in the php code that should be moved to the .rodata section. I remembered
561      to update Builducptable as well, so it won't revert if ucptable.h is ever      to update Builducptable as well, so it won't revert if ucptable.h is ever
562      re-created.      re-created.
563    
564     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
565        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
566        order to be able to cut out the UTF-8 tables in the latter when UTF-8
567        support is not required. This saves 1.5-2K of code, which is important in
568        some applications.
569    
570        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
571        so as not to refer to the tables, even though these functions will never be
572        called when UTF-8 support is disabled. Otherwise there are problems with a
573        shared library.
574    
575    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
576    
577        (a) It was defining its arguments as char * instead of void *.
578    
579        (b) It was assuming that all moves were upwards in memory; this was true
580            a long time ago when I wrote it, but is no longer the case.
581    
582        The emulated memove() is provided for those environments that have neither
583        memmove() nor bcopy(). I didn't think anyone used it these days, but that
584        is clearly not the case, as these two bugs were recently reported.
585    
586    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
587        and Detrail to create the HTML documentation, the .txt form of the man
588        pages, and it removes trailing spaces from listed files. It also creates
589        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
590        case, it wraps all the #defines with #ifndefs. This script should be run
591        before "make dist".
592    
593    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
594        with Unicode property support.
595    
596        (a) For a maximizing quantifier, if the two different cases of the
597            character were of different lengths in their UTF-8 codings (there are
598            some cases like this - I found 11), and the matching function had to
599            back up over a mixture of the two cases, it incorrectly assumed they
600            were both the same length.
601    
602        (b) When PCRE was configured to use the heap rather than the stack for
603            recursion during matching, it was not correctly preserving the data for
604            the other case of a UTF-8 character when checking ahead for a match
605            while processing a minimizing repeat. If the check also involved
606            matching a wide character, but failed, corruption could cause an
607            erroneous result when trying to check for a repeat of the original
608            character.
609    
610    13. Some tidying changes to the testing mechanism:
611    
612        (a) The RunTest script now detects the internal link size and whether there
613            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
614            values substituted by "configure". (The RunGrepTest script already did
615            this for UTF-8.) The configure.ac script no longer substitutes the
616            relevant variables.
617    
618        (b) The debugging options /B and /D in pcretest show the compiled bytecode
619            with length and offset values. This means that the output is different
620            for different internal link sizes. Test 2 is skipped for link sizes
621            other than 2 because of this, bypassing the problem. Unfortunately,
622            there was also a test in test 3 (the locale tests) that used /B and
623            failed for link sizes other than 2. Rather than cut the whole test out,
624            I have added a new /Z option to pcretest that replaces the length and
625            offset values with spaces. This is now used to make test 3 independent
626            of link size. (Test 2 will be tidied up later.)
627    
628    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
629        segmentation fault instead of returning the appropriate error message.
630    
631    15. In multiline mode when the newline sequence was set to "any", the pattern
632        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
633        This doesn't seem right; it now treats the CRLF combination as the line
634        ending, and so does not match in that case. It's only a pattern such as ^$
635        that would hit this one: something like ^ABC$ would have failed after \r
636        and then tried again after \r\n.
637    
638    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
639        in an attempt to make files that differ only in their line terminators
640        compare equal. This works on Linux.
641    
642    17. Under certain error circumstances pcregrep might try to free random memory
643        as it exited. This is now fixed, thanks to valgrind.
644    
645    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
646        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
647        was because its rules for how to advance for /g after matching an empty
648        string at the end of a line did not allow for this case. They now check for
649        it specially.
650    
651    20. pcretest is supposed to handle patterns and data of any length, by
652        extending its buffers when necessary. It was getting this wrong when the
653        buffer for a data line had to be extended.
654    
655    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
656        CRLF as a newline sequence.
657    
658    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
659        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
660        I have nevertheless tidied it up.
661    
662    23. Added some casts to kill warnings from HP-UX ia64 compiler.
663    
664    24. Added a man page for pcre-config.
665    
666    
667  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
668  ---------------------  ---------------------

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