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-revision 75 by nigel,
Sat Feb 24 21:40:37 2007 UTC
+revision 91 by nigel,
Sat Feb 24 21:41:34 2007 UTC
 Line 1
  ChangeLog for PCRE
  ------------------
+ Version 6.7 04-Jul-06
+ ---------------------
+. In order to handle tests when input lines are enormously long, pcretest has
+     been re-factored so that it automatically extends its buffers when
+     necessary. The code is crude, but this _is_ just a test program. The
+     default size has been increased from 32K to 50K.
+. The code in pcre_study() was using the value of the re argument before
+     testing it for NULL. (Of course, in any sensible call of the function, it
+     won't be NULL.)
+. The memmove() emulation function in pcre_internal.h, which is used on
+     systems that lack both memmove() and bcopy() - that is, hardly ever -
+     was missing a "static" storage class specifier.
+. When UTF-8 mode was not set, PCRE looped when compiling certain patterns
+     containing an extended class (one that cannot be represented by a bitmap
+     because it contains high-valued characters or Unicode property items, e.g.
+     [\pZ]). Almost always one would set UTF-8 mode when processing such a
+     pattern, but PCRE should not loop if you do not (it no longer does).
+     [Detail: two cases were found: (a) a repeated subpattern containing an
+     extended class; (b) a recursive reference to a subpattern that followed a
+     previous extended class. It wasn't skipping over the extended class
+     correctly when UTF-8 mode was not set.]
+. A negated single-character class was not being recognized as fixed-length
+     in lookbehind assertions such as (?<=[^f]), leading to an incorrect
+     compile error "lookbehind assertion is not fixed length".
+. The RunPerlTest auxiliary script was showing an unexpected difference
+     between PCRE and Perl for UTF-8 tests. It turns out that it is hard to
+     write a Perl script that can interpret lines of an input file either as
+     byte characters or as UTF-8, which is what "perltest" was being required to
+     do for the non-UTF-8 and UTF-8 tests, respectively. Essentially what you
+     can't do is switch easily at run time between having the "use utf8;" pragma
+     or not. In the end, I fudged it by using the RunPerlTest script to insert
+     "use utf8;" explicitly for the UTF-8 tests.
+. In multiline (/m) mode, PCRE was matching ^ after a terminating newline at
+     the end of the subject string, contrary to the documentation and to what
+     Perl does. This was true of both matching functions. Now it matches only at
+     the start of the subject and immediately after *internal* newlines.
+. A call of pcre_fullinfo() from pcretest to get the option bits was passing
+     a pointer to an int instead of a pointer to an unsigned long int. This
+     caused problems on 64-bit systems.
+. Applied a patch from the folks at Google to pcrecpp.cc, to fix "another
+     instance of the 'standard' template library not being so standard".
+. There was no check on the number of named subpatterns nor the maximum
+     length of a subpattern name. The product of these values is used to compute
+     the size of the memory block for a compiled pattern. By supplying a very
+     long subpattern name and a large number of named subpatterns, the size
+     computation could be caused to overflow. This is now prevented by limiting
+     the length of names to 32 characters, and the number of named subpatterns
+     to 10,000.
+. Subpatterns that are repeated with specific counts have to be replicated in
+     the compiled pattern. The size of memory for this was computed from the
+     length of the subpattern and the repeat count. The latter is limited to
+, but there was no limit on the former, meaning that integer overflow
+     could in principle occur. The compiled length of a repeated subpattern is
+     now limited to 30,000 bytes in order to prevent this.
+. Added the optional facility to have named substrings with the same name.
+. Added the ability to use a named substring as a condition, using the
+     Python syntax: (?(name)yes|no). This overloads (?(R)... and names that
+     are numbers (not recommended). Forward references are permitted.
+. Added forward references in named backreferences (if you see what I mean).
+. In UTF-8 mode, with the PCRE_DOTALL option set, a quantified dot in the
+     pattern could run off the end of the subject. For example, the pattern
+     "(?s)(.{1,5})"8 did this with the subject "ab".
+. If PCRE_DOTALL or PCRE_MULTILINE were set, pcre_dfa_exec() behaved as if
+     PCRE_CASELESS was set when matching characters that were quantified with ?
+     or *.
+. A character class other than a single negated character that had a minimum
+     but no maximum quantifier - for example [ab]{6,} - was not handled
+     correctly by pce_dfa_exec(). It would match only one character.
+. A valid (though odd) pattern that looked like a POSIX character
+     class but used an invalid character after [ (for example [[,abc,]]) caused
+     pcre_compile() to give the error "Failed: internal error: code overflow" or
+     in some cases to crash with a glibc free() error. This could even happen if
+     the pattern terminated after [[ but there just happened to be a sequence of
+     letters, a binary zero, and a closing ] in the memory that followed.
+. Perl's treatment of octal escapes in the range \400 to \777 has changed
+     over the years. Originally (before any Unicode support), just the bottom 8
+     bits were taken. Thus, for example, \500 really meant \100. Nowadays the
+     output from "man perlunicode" includes this:
+       The regular expression compiler produces polymorphic opcodes.  That
+       is, the pattern adapts to the data and automatically switches to
+       the Unicode character scheme when presented with Unicode data--or
+       instead uses a traditional byte scheme when presented with byte
+       data.
+     Sadly, a wide octal escape does not cause a switch, and in a string with
+     no other multibyte characters, these octal escapes are treated as before.
+     Thus, in Perl, the pattern  /\500/ actually matches \100 but the pattern
+     /\500|\x{1ff}/ matches \500 or \777 because the whole thing is treated as a
+     Unicode string.
+     I have not perpetrated such confusion in PCRE. Up till now, it took just
+     the bottom 8 bits, as in old Perl. I have now made octal escapes with
+     values greater than \377 illegal in non-UTF-8 mode. In UTF-8 mode they
+     translate to the appropriate multibyte character.
+. Applied some refactoring to reduce the number of warnings from Microsoft
+     and Borland compilers. This has included removing the fudge introduced
+     seven years ago for the OS/2 compiler (see 2.02/2 below) because it caused
+     a warning about an unused variable.
+. PCRE has not included VT (character 0x0b) in the set of whitespace
+     characters since release 4.0, because Perl (from release 5.004) does not.
+     [Or at least, is documented not to: some releases seem to be in conflict
+     with the documentation.] However, when a pattern was studied with
+     pcre_study() and all its branches started with \s, PCRE still included VT
+     as a possible starting character. Of course, this did no harm; it just
+     caused an unnecessary match attempt.
+. Removed a now-redundant internal flag bit that recorded the fact that case
+     dependency changed within the pattern. This was once needed for "required
+     byte" processing, but is no longer used. This recovers a now-scarce options
+     bit. Also moved the least significant internal flag bit to the most-
+     significant bit of the word, which was not previously used (hangover from
+     the days when it was an int rather than a uint) to free up another bit for
+     the future.
+. Added support for CRLF line endings as well as CR and LF. As well as the
+     default being selectable at build time, it can now be changed at runtime
+     via the PCRE_NEWLINE_xxx flags. There are now options for pcregrep to
+     specify that it is scanning data with non-default line endings.
+. Changed the definition of CXXLINK to make it agree with the definition of
+     LINK in the Makefile, by replacing LDFLAGS to CXXFLAGS.
+. Applied Ian Taylor's patches to avoid using another stack frame for tail
+     recursions. This makes a big different to stack usage for some patterns.
+. If a subpattern containing a named recursion or subroutine reference such
+     as (?P>B) was quantified, for example (xxx(?P>B)){3}, the calculation of
+     the space required for the compiled pattern went wrong and gave too small a
+     value. Depending on the environment, this could lead to "Failed: internal
+     error: code overflow at offset 49" or "glibc detected double free or
+     corruption" errors.
+. Applied patches from Google (a) to support the new newline modes and (b) to
+     advance over multibyte UTF-8 characters in GlobalReplace.
+. Change free() to pcre_free() in pcredemo.c. Apparently this makes a
+     difference for some implementation of PCRE in some Windows version.
+. Added some extra testing facilities to pcretest:
+     \q<number>   in a data line sets the "match limit" value
+     \Q<number>   in a data line sets the "match recursion limt" value
+     -S <number>  sets the stack size, where <number> is in megabytes
+     The -S option isn't available for Windows.
+ Version 6.6 06-Feb-06
+ ---------------------
+. Change 16(a) for 6.5 broke things, because PCRE_DATA_SCOPE was not defined
+     in pcreposix.h. I have copied the definition from pcre.h.
+. Change 25 for 6.5 broke compilation in a build directory out-of-tree
+     because pcre.h is no longer a built file.
+. Added Jeff Friedl's additional debugging patches to pcregrep. These are
+     not normally included in the compiled code.
+ Version 6.5 01-Feb-06
+ ---------------------
+. When using the partial match feature with pcre_dfa_exec(), it was not
+     anchoring the second and subsequent partial matches at the new starting
+     point. This could lead to incorrect results. For example, with the pattern
+     /1234/, partially matching against "123" and then "a4" gave a match.
+. Changes to pcregrep:
+     (a) All non-match returns from pcre_exec() were being treated as failures
+         to match the line. Now, unless the error is PCRE_ERROR_NOMATCH, an
+         error message is output. Some extra information is given for the
+         PCRE_ERROR_MATCHLIMIT and PCRE_ERROR_RECURSIONLIMIT errors, which are
+         probably the only errors that are likely to be caused by users (by
+         specifying a regex that has nested indefinite repeats, for instance).
+         If there are more than 20 of these errors, pcregrep is abandoned.
+     (b) A binary zero was treated as data while matching, but terminated the
+         output line if it was written out. This has been fixed: binary zeroes
+         are now no different to any other data bytes.
+     (c) Whichever of the LC_ALL or LC_CTYPE environment variables is set is
+         used to set a locale for matching. The --locale=xxxx long option has
+         been added (no short equivalent) to specify a locale explicitly on the
+         pcregrep command, overriding the environment variables.
+     (d) When -B was used with -n, some line numbers in the output were one less
+         than they should have been.
+     (e) Added the -o (--only-matching) option.
+     (f) If -A or -C was used with -c (count only), some lines of context were
+         accidentally printed for the final match.
+     (g) Added the -H (--with-filename) option.
+     (h) The combination of options -rh failed to suppress file names for files
+         that were found from directory arguments.
+     (i) Added the -D (--devices) and -d (--directories) options.
+     (j) Added the -F (--fixed-strings) option.
+     (k) Allow "-" to be used as a file name for -f as well as for a data file.
+     (l) Added the --colo(u)r option.
+     (m) Added Jeffrey Friedl's -S testing option, but within #ifdefs so that it
+         is not present by default.
+. A nasty bug was discovered in the handling of recursive patterns, that is,
+     items such as (?R) or (?1), when the recursion could match a number of
+     alternatives. If it matched one of the alternatives, but subsequently,
+     outside the recursion, there was a failure, the code tried to back up into
+     the recursion. However, because of the way PCRE is implemented, this is not
+     possible, and the result was an incorrect result from the match.
+     In order to prevent this happening, the specification of recursion has
+     been changed so that all such subpatterns are automatically treated as
+     atomic groups. Thus, for example, (?R) is treated as if it were (?>(?R)).
+. I had overlooked the fact that, in some locales, there are characters for
+     which isalpha() is true but neither isupper() nor islower() are true. In
+     the fr_FR locale, for instance, the \xAA and \xBA characters (ordmasculine
+     and ordfeminine) are like this. This affected the treatment of \w and \W
+     when they appeared in character classes, but not when they appeared outside
+     a character class. The bit map for "word" characters is now created
+     separately from the results of isalnum() instead of just taking it from the
+     upper, lower, and digit maps. (Plus the underscore character, of course.)
+. The above bug also affected the handling of POSIX character classes such as
+     [[:alpha:]] and [[:alnum:]]. These do not have their own bit maps in PCRE's
+     permanent tables. Instead, the bit maps for such a class were previously
+     created as the appropriate unions of the upper, lower, and digit bitmaps.
+     Now they are created by subtraction from the [[:word:]] class, which has
+     its own bitmap.
+. The [[:blank:]] character class matches horizontal, but not vertical space.
+     It is created by subtracting the vertical space characters (\x09, \x0a,
+     \x0b, \x0c) from the [[:space:]] bitmap. Previously, however, the
+     subtraction was done in the overall bitmap for a character class, meaning
+     that a class such as [\x0c[:blank:]] was incorrect because \x0c would not
+     be recognized. This bug has been fixed.
+. Patches from the folks at Google:
+       (a) pcrecpp.cc: "to handle a corner case that may or may not happen in
+       real life, but is still worth protecting against".
+       (b) pcrecpp.cc: "corrects a bug when negative radixes are used with
+       regular expressions".
+       (c) pcre_scanner.cc: avoid use of std::count() because not all systems
+       have it.
+       (d) Split off pcrecpparg.h from pcrecpp.h and had the former built by
+       "configure" and the latter not, in order to fix a problem somebody had
+       with compiling the Arg class on HP-UX.
+       (e) Improve the error-handling of the C++ wrapper a little bit.
+       (f) New tests for checking recursion limiting.
+. The pcre_memmove() function, which is used only if the environment does not
+     have a standard memmove() function (and is therefore rarely compiled),
+     contained two bugs: (a) use of int instead of size_t, and (b) it was not
+     returning a result (though PCRE never actually uses the result).
+. In the POSIX regexec() interface, if nmatch is specified as a ridiculously
+     large number - greater than INT_MAX/(3*sizeof(int)) - REG_ESPACE is
+     returned instead of calling malloc() with an overflowing number that would
+     most likely cause subsequent chaos.
+. The debugging option of pcretest was not showing the NO_AUTO_CAPTURE flag.
+. The POSIX flag REG_NOSUB is now supported. When a pattern that was compiled
+     with this option is matched, the nmatch and pmatch options of regexec() are
+     ignored.
+. Added REG_UTF8 to the POSIX interface. This is not defined by POSIX, but is
+     provided in case anyone wants to the the POSIX interface with UTF-8
+     strings.
+. Added CXXLDFLAGS to the Makefile parameters to provide settings only on the
+     C++ linking (needed for some HP-UX environments).
+. Avoid compiler warnings in get_ucpname() when compiled without UCP support
+     (unused parameter) and in the pcre_printint() function (omitted "default"
+     switch label when the default is to do nothing).
+. Added some code to make it possible, when PCRE is compiled as a C++
+     library, to replace subject pointers for pcre_exec() with a smart pointer
+     class, thus making it possible to process discontinuous strings.
+. The two macros PCRE_EXPORT and PCRE_DATA_SCOPE are confusing, and perform
+     much the same function. They were added by different people who were trying
+     to make PCRE easy to compile on non-Unix systems. It has been suggested
+     that PCRE_EXPORT be abolished now that there is more automatic apparatus
+     for compiling on Windows systems. I have therefore replaced it with
+     PCRE_DATA_SCOPE. This is set automatically for Windows; if not set it
+     defaults to "extern" for C or "extern C" for C++, which works fine on
+     Unix-like systems. It is now possible to override the value of PCRE_DATA_
+     SCOPE with something explicit in config.h. In addition:
+     (a) pcreposix.h still had just "extern" instead of either of these macros;
+         I have replaced it with PCRE_DATA_SCOPE.
+     (b) Functions such as _pcre_xclass(), which are internal to the library,
+         but external in the C sense, all had PCRE_EXPORT in their definitions.
+         This is apparently wrong for the Windows case, so I have removed it.
+         (It makes no difference on Unix-like systems.)
+. Added a new limit, MATCH_LIMIT_RECURSION, which limits the depth of nesting
+     of recursive calls to match(). This is different to MATCH_LIMIT because
+     that limits the total number of calls to match(), not all of which increase
+     the depth of recursion. Limiting the recursion depth limits the amount of
+     stack (or heap if NO_RECURSE is set) that is used. The default can be set
+     when PCRE is compiled, and changed at run time. A patch from Google adds
+     this functionality to the C++ interface.
+. Changes to the handling of Unicode character properties:
+     (a) Updated the table to Unicode 4.1.0.
+     (b) Recognize characters that are not in the table as "Cn" (undefined).
+     (c) I revised the way the table is implemented to a much improved format
+         which includes recognition of ranges. It now supports the ranges that
+         are defined in UnicodeData.txt, and it also amalgamates other
+         characters into ranges. This has reduced the number of entries in the
+         table from around 16,000 to around 3,000, thus reducing its size
+         considerably. I realized I did not need to use a tree structure after
+         all - a binary chop search is just as efficient. Having reduced the
+         number of entries, I extended their size from 6 bytes to 8 bytes to
+         allow for more data.
+     (d) Added support for Unicode script names via properties such as \p{Han}.
+. In UTF-8 mode, a backslash followed by a non-Ascii character was not
+     matching that character.
+. When matching a repeated Unicode property with a minimum greater than zero,
+     (for example \pL{2,}), PCRE could look past the end of the subject if it
+     reached it while seeking the minimum number of characters. This could
+     happen only if some of the characters were more than one byte long, because
+     there is a check for at least the minimum number of bytes.
+. Refactored the implementation of \p and \P so as to be more general, to
+     allow for more different types of property in future. This has changed the
+     compiled form incompatibly. Anybody with saved compiled patterns that use
+     \p or \P will have to recompile them.
+. Added "Any" and "L&" to the supported property types.
+. Recognize \x{...} as a code point specifier, even when not in UTF-8 mode,
+     but give a compile time error if the value is greater than 0xff.
+. The man pages for pcrepartial, pcreprecompile, and pcre_compile2 were
+     accidentally not being installed or uninstalled.
+. The pcre.h file was built from pcre.h.in, but the only changes that were
+     made were to insert the current release number. This seemed silly, because
+     it made things harder for people building PCRE on systems that don't run
+     "configure". I have turned pcre.h into a distributed file, no longer built
+     by "configure", with the version identification directly included. There is
+     no longer a pcre.h.in file.
+     However, this change necessitated a change to the pcre-config script as
+     well. It is built from pcre-config.in, and one of the substitutions was the
+     release number. I have updated configure.ac so that ./configure now finds
+     the release number by grepping pcre.h.
+. Added the ability to run the tests under valgrind.
+ Version 6.4 05-Sep-05
+ ---------------------
+. Change 6.0/10/(l) to pcregrep introduced a bug that caused separator lines
+     "--" to be printed when multiple files were scanned, even when none of the
+     -A, -B, or -C options were used. This is not compatible with Gnu grep, so I
+     consider it to be a bug, and have restored the previous behaviour.
+. A couple of code tidies to get rid of compiler warnings.
+. The pcretest program used to cheat by referring to symbols in the library
+     whose names begin with _pcre_. These are internal symbols that are not
+     really supposed to be visible externally, and in some environments it is
+     possible to suppress them. The cheating is now confined to including
+     certain files from the library's source, which is a bit cleaner.
+. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
+     file's purpose clearer.
+. Reorganized pcre_ucp_findchar().
+ Version 6.3 15-Aug-05
+ ---------------------
+. The file libpcre.pc.in did not have general read permission in the tarball.
+. There were some problems when building without C++ support:
+     (a) If C++ support was not built, "make install" and "make test" still
+         tried to test it.
+     (b) There were problems when the value of CXX was explicitly set. Some
+         changes have been made to try to fix these, and ...
+     (c) --disable-cpp can now be used to explicitly disable C++ support.
+     (d) The use of @CPP_OBJ@ directly caused a blank line preceded by a
+         backslash in a target when C++ was disabled. This confuses some
+         versions of "make", apparently. Using an intermediate variable solves
+         this. (Same for CPP_LOBJ.)
+. $(LINK_FOR_BUILD) now includes $(CFLAGS_FOR_BUILD) and $(LINK)
+     (non-Windows) now includes $(CFLAGS) because these flags are sometimes
+     necessary on certain architectures.
+. Added a setting of -export-symbols-regex to the link command to remove
+     those symbols that are exported in the C sense, but actually are local
+     within the library, and not documented. Their names all begin with
+     "_pcre_". This is not a perfect job, because (a) we have to except some
+     symbols that pcretest ("illegally") uses, and (b) the facility isn't always
+     available (and never for static libraries). I have made a note to try to
+     find a way round (a) in the future.
+ Version 6.2 01-Aug-05
+ ---------------------
+. There was no test for integer overflow of quantifier values. A construction
+     such as {1111111111111111} would give undefined results. What is worse, if
+     a minimum quantifier for a parenthesized subpattern overflowed and became
+     negative, the calculation of the memory size went wrong. This could have
+     led to memory overwriting.
+. Building PCRE using VPATH was broken. Hopefully it is now fixed.
+. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
+     operating environments where this matters.
+. Applied Giuseppe Maxia's patch to add additional features for controlling
+     PCRE options from within the C++ wrapper.
+. Named capturing subpatterns were not being correctly counted when a pattern
+     was compiled. This caused two problems: (a) If there were more than 100
+     such subpatterns, the calculation of the memory needed for the whole
+     compiled pattern went wrong, leading to an overflow error. (b) Numerical
+     back references of the form \12, where the number was greater than 9, were
+     not recognized as back references, even though there were sufficient
+     previous subpatterns.
+. Two minor patches to pcrecpp.cc in order to allow it to compile on older
+     versions of gcc, e.g. 2.95.4.
+ Version 6.1 21-Jun-05
+ ---------------------
+. There was one reference to the variable "posix" in pcretest.c that was not
+     surrounded by "#if !defined NOPOSIX".
+. Make it possible to compile pcretest without DFA support, UTF8 support, or
+     the cross-check on the old pcre_info() function, for the benefit of the
+     cut-down version of PCRE that is currently imported into Exim.
+. A (silly) pattern starting with (?i)(?-i) caused an internal space
+     allocation error. I've done the easy fix, which wastes 2 bytes for sensible
+     patterns that start (?i) but I don't think that matters. The use of (?i) is
+     just an example; this all applies to the other options as well.
+. Since libtool seems to echo the compile commands it is issuing, the output
+     from "make" can be reduced a bit by putting "@" in front of each libtool
+     compile command.
+. Patch from the folks at Google for configure.in to be a bit more thorough
+     in checking for a suitable C++ installation before trying to compile the
+     C++ stuff. This should fix a reported problem when a compiler was present,
+     but no suitable headers.
+. The man pages all had just "PCRE" as their title. I have changed them to
+     be the relevant file name. I have also arranged that these names are
+     retained in the file doc/pcre.txt, which is a concatenation in text format
+     of all the man pages except the little individual ones for each function.
+. The NON-UNIX-USE file had not been updated for the different set of source
+     files that come with release 6. I also added a few comments about the C++
+     wrapper.
+ Version 6.0 07-Jun-05
+ ---------------------
+. Some minor internal re-organization to help with my DFA experiments.
+. Some missing #ifdef SUPPORT_UCP conditionals in pcretest and printint that
+     didn't matter for the library itself when fully configured, but did matter
+     when compiling without UCP support, or within Exim, where the ucp files are
+     not imported.
+. Refactoring of the library code to split up the various functions into
+     different source modules. The addition of the new DFA matching code (see
+     below) to a single monolithic source would have made it really too
+     unwieldy, quite apart from causing all the code to be include in a
+     statically linked application, when only some functions are used. This is
+     relevant even without the DFA addition now that patterns can be compiled in
+     one application and matched in another.
+     The downside of splitting up is that there have to be some external
+     functions and data tables that are used internally in different modules of
+     the library but which are not part of the API. These have all had their
+     names changed to start with "_pcre_" so that they are unlikely to clash
+     with other external names.
+. Added an alternate matching function, pcre_dfa_exec(), which matches using
+     a different (DFA) algorithm. Although it is slower than the original
+     function, it does have some advantages for certain types of matching
+     problem.
+. Upgrades to pcretest in order to test the features of pcre_dfa_exec(),
+     including restarting after a partial match.
+. A patch for pcregrep that defines INVALID_FILE_ATTRIBUTES if it is not
+     defined when compiling for Windows was sent to me. I have put it into the
+     code, though I have no means of testing or verifying it.
+. Added the pcre_refcount() auxiliary function.
+. Added the PCRE_FIRSTLINE option. This constrains an unanchored pattern to
+     match before or at the first newline in the subject string. In pcretest,
+     the /f option on a pattern can be used to set this.
+. A repeated \w when used in UTF-8 mode with characters greater than 256
+     would behave wrongly. This has been present in PCRE since release 4.0.
+. A number of changes to the pcregrep command:
+     (a) Refactored how -x works; insert ^(...)$ instead of setting
+         PCRE_ANCHORED and checking the length, in preparation for adding
+         something similar for -w.
+     (b) Added the -w (match as a word) option.
+     (c) Refactored the way lines are read and buffered so as to have more
+         than one at a time available.
+     (d) Implemented a pcregrep test script.
+     (e) Added the -M (multiline match) option. This allows patterns to match
+         over several lines of the subject. The buffering ensures that at least
+K, or the rest of the document (whichever is the shorter) is available
+         for matching (and similarly the previous 8K for lookbehind assertions).
+     (f) Changed the --help output so that it now says
+           -w, --word-regex(p)
+         instead of two lines, one with "regex" and the other with "regexp"
+         because that confused at least one person since the short forms are the
+         same. (This required a bit of code, as the output is generated
+         automatically from a table. It wasn't just a text change.)
+     (g) -- can be used to terminate pcregrep options if the next thing isn't an
+         option but starts with a hyphen. Could be a pattern or a path name
+         starting with a hyphen, for instance.
+     (h) "-" can be given as a file name to represent stdin.
+     (i) When file names are being printed, "(standard input)" is used for
+         the standard input, for compatibility with GNU grep. Previously
+         "<stdin>" was used.
+     (j) The option --label=xxx can be used to supply a name to be used for
+         stdin when file names are being printed. There is no short form.
+     (k) Re-factored the options decoding logic because we are going to add
+         two more options that take data. Such options can now be given in four
+         different ways, e.g. "-fname", "-f name", "--file=name", "--file name".
+     (l) Added the -A, -B, and -C options for requesting that lines of context
+         around matches be printed.
+     (m) Added the -L option to print the names of files that do not contain
+         any matching lines, that is, the complement of -l.
+     (n) The return code is 2 if any file cannot be opened, but pcregrep does
+         continue to scan other files.
+     (o) The -s option was incorrectly implemented. For compatibility with other
+         greps, it now suppresses the error message for a non-existent or non-
+         accessible file (but not the return code). There is a new option called
+         -q that suppresses the output of matching lines, which was what -s was
+         previously doing.
+     (p) Added --include and --exclude options to specify files for inclusion
+         and exclusion when recursing.
+. The Makefile was not using the Autoconf-supported LDFLAGS macro properly.
+     Hopefully, it now does.
+. Missing cast in pcre_study().
+. Added an "uninstall" target to the makefile.
+. Replaced "extern" in the function prototypes in Makefile.in with
+     "PCRE_DATA_SCOPE", which defaults to 'extern' or 'extern "C"' in the Unix
+     world, but is set differently for Windows.
+. Added a second compiling function called pcre_compile2(). The only
+     difference is that it has an extra argument, which is a pointer to an
+     integer error code. When there is a compile-time failure, this is set
+     non-zero, in addition to the error test pointer being set to point to an
+     error message. The new argument may be NULL if no error number is required
+     (but then you may as well call pcre_compile(), which is now just a
+     wrapper). This facility is provided because some applications need a
+     numeric error indication, but it has also enabled me to tidy up the way
+     compile-time errors are handled in the POSIX wrapper.
+. Added VPATH=.libs to the makefile; this should help when building with one
+     prefix path and installing with another. (Or so I'm told by someone who
+     knows more about this stuff than I do.)
+. Added a new option, REG_DOTALL, to the POSIX function regcomp(). This
+     passes PCRE_DOTALL to the pcre_compile() function, making the "." character
+     match everything, including newlines. This is not POSIX-compatible, but
+     somebody wanted the feature. From pcretest it can be activated by using
+     both the P and the s flags.
+. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one.
+. libpcre.pc was being incorrectly installed as executable.
+. A couple of places in pcretest check for end-of-line by looking for '\n';
+     it now also looks for '\r' so that it will work unmodified on Windows.
+. Added Google's contributed C++ wrapper to the distribution.
+. Added some untidy missing memory free() calls in pcretest, to keep
+     Electric Fence happy when testing.
  Version 5.0 13-Sep-04
  ---------------------

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