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

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