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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 8.01 11-Dec-09
5    ----------------------
6    
7    1.  If a pattern contained a conditional subpattern with only one branch (in
8        particular, this includes all (DEFINE) patterns), a call to pcre_study()
9        computed the wrong minimum data length (which is of course zero for such
10        subpatterns).
11    
12    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
13        the pattern is reset in the first branch, pcre_compile() failed with
14        "internal error: code overflow at offset...". This happened only when
15        the reset was to the original external option setting. (An optimization
16        abstracts leading options settings into an external setting, which was the
17        cause of this.)
18    
19    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
20        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
21        assertion pattern did not match (meaning that the assertion was true), it
22        was incorrectly treated as false if the SKIP had been reached during the
23        matching. This also applied to assertions used as conditions.
24    
25    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
26        assertion subpattern, including such a pattern used as a condition,
27        unpredictable results occurred, instead of the error return
28        PCRE_ERROR_DFA_UITEM.
29    
30    5.  The C++ GlobalReplace function was not working like Perl for the special
31        situation when an empty string is matched. It now does the fancy magic
32        stuff that is necessary.
33    
34    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
35        removed. (These were left over from very, very early versions of PCRE.)
36    
37    7.  Some cosmetic changes to the code to make life easier when compiling it
38        as part of something else:
39    
40        (a) Change DEBUG to PCRE_DEBUG.
41    
42        (b) In pcre_compile(), rename the member of the "branch_chain" structure
43            called "current" as "current_branch", to prevent a collision with the
44            Linux macro when compiled as a kernel module.
45    
46        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
47            prevent a collision with the Linux macro when compiled as a kernel
48            module.
49    
50    8.  In pcre_compile() there are some checks for integer overflows that used to
51        cast potentially large values to (double). This has been changed to that
52        when building, a check for int64_t is made, and if it is found, it is used
53        instead, thus avoiding the use of floating point arithmetic. (There is no
54        other use of FP in PCRE.) If int64_t is not found, the fallback is to
55        double.
56    
57    
58    
59    Version 8.00 19-Oct-09
60    ----------------------
61    
62    1.  The table for translating pcre_compile() error codes into POSIX error codes
63        was out-of-date, and there was no check on the pcre_compile() error code
64        being within the table. This could lead to an OK return being given in
65        error.
66    
67    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
68        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
69        in a Windows environment.
70    
71    3.  The pcregrep --count option prints the count for each file even when it is
72        zero, as does GNU grep. However, pcregrep was also printing all files when
73        --files-with-matches was added. Now, when both options are given, it prints
74        counts only for those files that have at least one match. (GNU grep just
75        prints the file name in this circumstance, but including the count seems
76        more useful - otherwise, why use --count?) Also ensured that the
77        combination -clh just lists non-zero counts, with no names.
78    
79    4.  The long form of the pcregrep -F option was incorrectly implemented as
80        --fixed_strings instead of --fixed-strings. This is an incompatible change,
81        but it seems right to fix it, and I didn't think it was worth preserving
82        the old behaviour.
83    
84    5.  The command line items --regex=pattern and --regexp=pattern were not
85        recognized by pcregrep, which required --regex pattern or --regexp pattern
86        (with a space rather than an '='). The man page documented the '=' forms,
87        which are compatible with GNU grep; these now work.
88    
89    6.  No libpcreposix.pc file was created for pkg-config; there was just
90        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
91    
92    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
93        when UCP support is not needed, by modifying the Python script that
94        generates it from Unicode data files. This should not matter if the module
95        is correctly used as a library, but I received one complaint about 50K of
96        unwanted data. My guess is that the person linked everything into his
97        program rather than using a library. Anyway, it does no harm.
98    
99    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
100        was a minimum greater than 1 for a wide character in a possessive
101        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
102        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
103        character. Chaos in the form of incorrect output or a compiling loop could
104        result.
105    
106    9.  The restrictions on what a pattern can contain when partial matching is
107        requested for pcre_exec() have been removed. All patterns can now be
108        partially matched by this function. In addition, if there are at least two
109        slots in the offset vector, the offset of the earliest inspected character
110        for the match and the offset of the end of the subject are set in them when
111        PCRE_ERROR_PARTIAL is returned.
112    
113    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
114        synonymous with PCRE_PARTIAL, for backwards compatibility, and
115        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
116        and may be more useful for multi-segment matching.
117    
118    11. Partial matching with pcre_exec() is now more intuitive. A partial match
119        used to be given if ever the end of the subject was reached; now it is
120        given only if matching could not proceed because another character was
121        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
122        string "Z", which now yields "no match" instead of "partial match". In the
123        case of pcre_dfa_exec(), "no match" is given if every matching path for the
124        final character ended with (*FAIL).
125    
126    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
127        if the pattern had a "must contain" character that was already found in the
128        earlier partial match, unless partial matching was again requested. For
129        example, with the pattern /dog.(body)?/, the "must contain" character is
130        "g". If the first part-match was for the string "dog", restarting with
131        "sbody" failed. This bug has been fixed.
132    
133    13. The string returned by pcre_dfa_exec() after a partial match has been
134        changed so that it starts at the first inspected character rather than the
135        first character of the match. This makes a difference only if the pattern
136        starts with a lookbehind assertion or \b or \B (\K is not supported by
137        pcre_dfa_exec()). It's an incompatible change, but it makes the two
138        matching functions compatible, and I think it's the right thing to do.
139    
140    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
141        so that the demonstration program is easily available in environments where
142        PCRE has not been installed from source.
143    
144    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
145        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
146        library.
147    
148    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
149        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
150        is not the first non-POSIX option to be added. Clearly some people find
151        these options useful.
152    
153    17. If a caller to the POSIX matching function regexec() passes a non-zero
154        value for nmatch with a NULL value for pmatch, the value of
155        nmatch is forced to zero.
156    
157    18. RunGrepTest did not have a test for the availability of the -u option of
158        the diff command, as RunTest does. It now checks in the same way as
159        RunTest, and also checks for the -b option.
160    
161    19. If an odd number of negated classes containing just a single character
162        interposed, within parentheses, between a forward reference to a named
163        subpattern and the definition of the subpattern, compilation crashed with
164        an internal error, complaining that it could not find the referenced
165        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
166        [The bug was that it was starting one character too far in when skipping
167        over the character class, thus treating the ] as data rather than
168        terminating the class. This meant it could skip too much.]
169    
170    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
171        /g option in pcretest when the pattern contains \K, which makes it possible
172        to have an empty string match not at the start, even when the pattern is
173        anchored. Updated pcretest and pcredemo to use this option.
174    
175    21. If the maximum number of capturing subpatterns in a recursion was greater
176        than the maximum at the outer level, the higher number was returned, but
177        with unset values at the outer level. The correct (outer level) value is
178        now given.
179    
180    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
181        PCRE did not set those parentheses (unlike Perl). I have now found a way to
182        make it do so. The string so far is captured, making this feature
183        compatible with Perl.
184    
185    23. The tests have been re-organized, adding tests 11 and 12, to make it
186        possible to check the Perl 5.10 features against Perl 5.10.
187    
188    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
189        pattern matches a fixed length string. PCRE did not allow this; now it
190        does. Neither allows recursion.
191    
192    25. I finally figured out how to implement a request to provide the minimum
193        length of subject string that was needed in order to match a given pattern.
194        (It was back references and recursion that I had previously got hung up
195        on.) This code has now been added to pcre_study(); it finds a lower bound
196        to the length of subject needed. It is not necessarily the greatest lower
197        bound, but using it to avoid searching strings that are too short does give
198        some useful speed-ups. The value is available to calling programs via
199        pcre_fullinfo().
200    
201    26. While implementing 25, I discovered to my embarrassment that pcretest had
202        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
203        study optimizations had never been tested with that matching function.
204        Oops. What is worse, even when it was passed study data, there was a bug in
205        pcre_dfa_exec() that meant it never actually used it. Double oops. There
206        were also very few tests of studied patterns with pcre_dfa_exec().
207    
208    27. If (?| is used to create subpatterns with duplicate numbers, they are now
209        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
210        on the other side of the coin, they are no longer allowed to have different
211        names, because these cannot be distinguished in PCRE, and this has caused
212        confusion. (This is a difference from Perl.)
213    
214    28. When duplicate subpattern names are present (necessarily with different
215        numbers, as required by 27 above), and a test is made by name in a
216        conditional pattern, either for a subpattern having been matched, or for
217        recursion in such a pattern, all the associated numbered subpatterns are
218        tested, and the overall condition is true if the condition is true for any
219        one of them. This is the way Perl works, and is also more like the way
220        testing by number works.
221    
222    
223    Version 7.9 11-Apr-09
224    ---------------------
225    
226    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
227        (pcretest), all targets were linked against these libraries. This included
228        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
229        libraries. This caused unwanted dependencies to be created. This problem
230        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
231        pcretest is linked with readline.
232    
233    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
234        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
235        moved outside it again, because FALSE and TRUE are already defined in AIX,
236        but BOOL is not.
237    
238    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
239        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
240    
241    4.  The pcregrep documentation said spaces were inserted as well as colons (or
242        hyphens) following file names and line numbers when outputting matching
243        lines. This is not true; no spaces are inserted. I have also clarified the
244        wording for the --colour (or --color) option.
245    
246    5.  In pcregrep, when --colour was used with -o, the list of matching strings
247        was not coloured; this is different to GNU grep, so I have changed it to be
248        the same.
249    
250    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
251        each matching line was coloured. Now it goes on to look for further matches
252        of any of the test patterns, which is the same behaviour as GNU grep.
253    
254    7.  A pattern that could match an empty string could cause pcregrep to loop; it
255        doesn't make sense to accept an empty string match in pcregrep, so I have
256        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
257        seems to be how GNU grep behaves.
258    
259    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
260        start or after a newline", because the conditional assertion was not being
261        correctly handled. The rule now is that both the assertion and what follows
262        in the first alternative must satisfy the test.
263    
264    9.  If auto-callout was enabled in a pattern with a conditional group whose
265        condition was an assertion, PCRE could crash during matching, both with
266        pcre_exec() and pcre_dfa_exec().
267    
268    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
269        used for matching.
270    
271    11. Unicode property support in character classes was not working for
272        characters (bytes) greater than 127 when not in UTF-8 mode.
273    
274    12. Added the -M command line option to pcretest.
275    
276    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
277    
278    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
279    
280    16. Added comments and documentation about mis-use of no_arg in the C++
281        wrapper.
282    
283    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
284        from Martin Jerabek that uses macro names for all relevant character and
285        string constants.
286    
287    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
288        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
289        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
290        these, but not everybody uses configure.
291    
292    19. A conditional group that had only one branch was not being correctly
293        recognized as an item that could match an empty string. This meant that an
294        enclosing group might also not be so recognized, causing infinite looping
295        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
296        with the subject "ab", where knowledge that the repeated group can match
297        nothing is needed in order to break the loop.
298    
299    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
300        exec(), but without supplying a callout function, matching went wrong.
301    
302    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
303        leak if the size of the offset vector was greater than 30. When the vector
304        is smaller, the saved offsets during recursion go onto a local stack
305        vector, but for larger vectors malloc() is used. It was failing to free
306        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
307        error, in fact).
308    
309    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
310        heapframe that is used only when UTF-8 support is enabled. This caused no
311        problem, but was untidy.
312    
313    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
314        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
315        included within another project.
316    
317    24. Steven Van Ingelgem's patches to add more options to the CMake support,
318        slightly modified by me:
319    
320          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
321              not building pcregrep.
322    
323          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
324              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
325    
326    25. Forward references, both numeric and by name, in patterns that made use of
327        duplicate group numbers, could behave incorrectly or give incorrect errors,
328        because when scanning forward to find the reference group, PCRE was not
329        taking into account the duplicate group numbers. A pattern such as
330        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
331    
332    26. Changed a few more instances of "const unsigned char *" to USPTR, making
333        the feature of a custom pointer more persuasive (as requested by a user).
334    
335    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
336        pcretest.c, inside #ifndefs, because it seems they are sometimes already
337        pre-defined.
338    
339    28. Added support for (*UTF8) at the start of a pattern.
340    
341    29. Arrange for flags added by the "release type" setting in CMake to be shown
342        in the configuration summary.
343    
344    
345    Version 7.8 05-Sep-08
346    ---------------------
347    
348    1.  Replaced UCP searching code with optimized version as implemented for Ad
349        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
350        stage table and inline lookup instead of a function, giving speed ups of 2
351        to 5 times on some simple patterns that I tested. Permission was given to
352        distribute the MultiStage2.py script that generates the tables (it's not in
353        the tarball, but is in the Subversion repository).
354    
355    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
356        scripts.
357    
358    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
359        a group with a zero qualifier. The result of the study could be incorrect,
360        or the function might crash, depending on the pattern.
361    
362    4.  Caseless matching was not working for non-ASCII characters in back
363        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
364        It now works when Unicode Property Support is available.
365    
366    5.  In pcretest, an escape such as \x{de} in the data was always generating
367        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
368        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
369        truncation.
370    
371    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
372    
373    7.  Added two (int) casts to pcregrep when printing the difference of two
374        pointers, in case they are 64-bit values.
375    
376    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
377        test 2 if it fails.
378    
379    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
380        and a #define of that name to empty if it is not externally set. This is to
381        allow users of MSVC to set it if necessary.
382    
383    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
384        the convenience functions in the pcre_get.c source file.
385    
386    11. An option change at the start of a pattern that had top-level alternatives
387        could cause overwriting and/or a crash. This command provoked a crash in
388        some environments:
389    
390          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
391    
392        This potential security problem was recorded as CVE-2008-2371.
393    
394    12. For a pattern where the match had to start at the beginning or immediately
395        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
396        pcre_dfa_exec() could read past the end of the passed subject if there was
397        no match. To help with detecting such bugs (e.g. with valgrind), I modified
398        pcretest so that it places the subject at the end of its malloc-ed buffer.
399    
400    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
401        exec() might read past the end of the data buffer in UTF-8 mode.
402    
403    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
404        the data contained the byte 0x85 as part of a UTF-8 character within its
405        first line. This applied both to normal and DFA matching.
406    
407    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
408        /^[^d]*?$/8 failed to match "abc".
409    
410    16. Added a missing copyright notice to pcrecpp_internal.h.
411    
412    17. Make it more clear in the documentation that values returned from
413        pcre_exec() in ovector are byte offsets, not character counts.
414    
415    18. Tidied a few places to stop certain compilers from issuing warnings.
416    
417    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
418        supplied by Stefan Weber. I made a further small update for 7.8 because
419        there is a change of source arrangements: the pcre_searchfuncs.c module is
420        replaced by pcre_ucd.c.
421    
422    
423    Version 7.7 07-May-08
424    ---------------------
425    
426    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
427        a string to a long long, pretend we don't even have a long long." This is
428        done by checking for the strtoq, strtoll, and _strtoi64 functions.
429    
430    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
431        pre-7.6 versions, which defined a global no_arg variable instead of putting
432        it in the RE class. (See also #8 below.)
433    
434    3.  Remove a line of dead code, identified by coverity and reported by Nuno
435        Lopes.
436    
437    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
438    
439        (1) The include/exclude patterns were being applied to the whole pathnames
440            of files, instead of just to the final components.
441    
442        (2) If there was more than one level of directory, the subdirectories were
443            skipped unless they satisfied the include/exclude conditions. This is
444            inconsistent with GNU grep (and could even be seen as contrary to the
445            pcregrep specification - which I improved to make it absolutely clear).
446            The action now is always to scan all levels of directory, and just
447            apply the include/exclude patterns to regular files.
448    
449    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
450        --exclude_dir in the tests to avoid scanning .svn directories.
451    
452    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
453        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
454        doesn't support NULs in patterns.
455    
456    7.  Added some missing "const"s to declarations of static tables in
457        pcre_compile.c and pcre_dfa_exec.c.
458    
459    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
460        caused by fix #2  above. (Subsequently also a second patch to fix the
461        first patch. And a third patch - this was a messy problem.)
462    
463    9.  Applied Craig's patch to remove the use of push_back().
464    
465    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
466        matching function regexec().
467    
468    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
469        which, however, unlike Perl's \g{...}, are subroutine calls, not back
470        references. PCRE supports relative numbers with this syntax (I don't think
471        Oniguruma does).
472    
473    12. Previously, a group with a zero repeat such as (...){0} was completely
474        omitted from the compiled regex. However, this means that if the group
475        was called as a subroutine from elsewhere in the pattern, things went wrong
476        (an internal error was given). Such groups are now left in the compiled
477        pattern, with a new opcode that causes them to be skipped at execution
478        time.
479    
480    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
481        to the way PCRE behaves:
482    
483        (a) A lone ] character is dis-allowed (Perl treats it as data).
484    
485        (b) A back reference to an unmatched subpattern matches an empty string
486            (Perl fails the current match path).
487    
488        (c) A data ] in a character class must be notated as \] because if the
489            first data character in a class is ], it defines an empty class. (In
490            Perl it is not possible to have an empty class.) The empty class []
491            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
492            The negative empty class [^] matches any one character, independently
493            of the DOTALL setting.
494    
495    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
496        non-existent subpattern following a character class starting with ']' and
497        containing () gave an internal compiling error instead of "reference to
498        non-existent subpattern". Fortunately, when the pattern did exist, the
499        compiled code was correct. (When scanning forwards to check for the
500        existencd of the subpattern, it was treating the data ']' as terminating
501        the class, so got the count wrong. When actually compiling, the reference
502        was subsequently set up correctly.)
503    
504    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
505        it was being rejected as not supported by pcre_dfa_exec(), even though
506        other assertions are supported. I have made pcre_dfa_exec() support
507        (*FAIL).
508    
509    16. The implementation of 13c above involved the invention of a new opcode,
510        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
511        cannot be changed at match time, I realized I could make a small
512        improvement to matching performance by compiling OP_ALLANY instead of
513        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
514        on the OP_ANY path.
515    
516    17. Compiling pcretest on Windows with readline support failed without the
517        following two fixes: (1) Make the unistd.h include conditional on
518        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
519    
520    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
521        ncurses library to be included for pcretest when ReadLine support is
522        requested, but also to allow for it to be overridden. This patch came from
523        Daniel Bergström.
524    
525    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
526        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
527        any errors with the current Unicode tables. Thanks to Peter Kankowski for
528        spotting this.
529    
530    
531  Version 7.6 28-Jan-08  Version 7.6 28-Jan-08
532  ---------------------  ---------------------
533    

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