Version 6.4 05-Sep-05
---------------------
1. 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.
2. A couple of code tidies to get rid of compiler warnings.
3. 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.
4. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
file's purpose clearer.
5. Reorganized pcre_ucp_findchar().
Version 6.3 15-Aug-05
---------------------
1. The file libpcre.pc.in did not have general read permission in the tarball.
2. 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.)
3. $(LINK_FOR_BUILD) now includes $(CFLAGS_FOR_BUILD) and $(LINK)
(non-Windows) now includes $(CFLAGS) because these flags are sometimes
necessary on certain architectures.
4. 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
---------------------
1. 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.
2. Building PCRE using VPATH was broken. Hopefully it is now fixed.
3. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
operating environments where this matters.
4. Applied Giuseppe Maxia's patch to add additional features for controlling
PCRE options from within the C++ wrapper.
5. 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.
6. 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
---------------------
1. There was one reference to the variable "posix" in pcretest.c that was not
surrounded by "#if !defined NOPOSIX".
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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
---------------------
1. Some minor internal re-organization to help with my DFA experiments.
2. 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.
3. 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.
4. 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.
5. Upgrades to pcretest in order to test the features of pcre_dfa_exec(),
including restarting after a partial match.
6. 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.
7. Added the pcre_refcount() auxiliary function.
8. 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.
9. 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.
10. 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
8K, 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.
11. The Makefile was not using the Autoconf-supported LDFLAGS macro properly.
Hopefully, it now does.
12. Missing cast in pcre_study().
13. Added an "uninstall" target to the makefile.
14. 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.
15. 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.
16. 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.)
17. 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.
18. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one.
19. libpcre.pc was being incorrectly installed as executable.
20. 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.
21. Added Google's contributed C++ wrapper to the distribution.
22. Added some untidy missing memory free() calls in pcretest, to keep
Electric Fence happy when testing.
in the process. (More information on tech-pkg.)
Bump PKGREVISION and BUILDLINK_DEPENDS of all packages using libtool and
installing .la files.
Bump PKGREVISION (only) of all packages depending directly on the above
via a buildlink3 include.
Release 5.0 13-Sep-04
---------------------
The licence under which PCRE is released has been changed to the more
conventional "BSD" licence.
In the code, some bugs have been fixed, and there are also some major changes
in this release (which is why I've increased the number to 5.0). Some changes
are internal rearrangements, and some provide a number of new facilities. The
new features are:
1. There's an "automatic callout" feature that inserts callouts before every
item in the regex, and there's a new callout field that gives the position
in the pattern - useful for debugging and tracing.
2. The extra_data structure can now be used to pass in a set of character
tables at exec time. This is useful if compiled regex are saved and re-used
at a later time when the tables may not be at the same address. If the
default internal tables are used, the pointer saved with the compiled
pattern is now set to NULL, which means that you don't need to do anything
special unless you are using custom tables.
3. It is possible, with some restrictions on the content of the regex, to
request "partial" matching. A special return code is given if all of the
subject string matched part of the regex. This could be useful for testing
an input field as it is being typed.
4. There is now some optional support for Unicode character properties, which
means that the patterns items such as \p{Lu} and \X can now be used. Only
the general category properties are supported. If PCRE is compiled with this
support, an additional 90K data structure is include, which increases the
size of the library dramatically.
5. There is support for saving compiled patterns and re-using them later.
6. There is support for running regular expressions that were compiled on a
different host with the opposite endianness.
7. The pcretest program has been extended to accommodate the new features.
The main internal rearrangement is that sequences of literal characters are no
longer handled as strings. Instead, each character is handled on its own. This
makes some UTF-8 handling easier, and makes the support of partial matching
possible. Compiled patterns containing long literal strings will be larger as a
result of this change; I hope that performance will not be much affected.
All library names listed by *.la files no longer need to be listed
in the PLIST, e.g., instead of:
lib/libfoo.a
lib/libfoo.la
lib/libfoo.so
lib/libfoo.so.0
lib/libfoo.so.0.1
one simply needs:
lib/libfoo.la
and bsd.pkg.mk will automatically ensure that the additional library
names are listed in the installed package +CONTENTS file.
Also make LIBTOOLIZE_PLIST default to "yes".
the normal case when BUILDLINK_DEPENDS.<pkg> isn't specified, it receives
a value only once due to the multiple inclusion protection in the
bulldlink3.mk files. In the case where a package includes several
buildlink3.mk files that each want a slightly different version of another
dependency, having BUILDLINK_DEPENDS.<pkg> be a list allows for the
strictest <pkg> dependency to be matched.
1. There has been some re-arrangement of the code for the match() function so
that it can be compiled in a version that does not call itself recursively.
Instead, it keeps those local variables that need separate instances for
each "recursion" in a frame on the heap, and gets/frees frames whenever it
needs to "recurse". Keeping track of where control must go is done by means
of setjmp/longjmp. The whole thing is implemented by a set of macros that
hide most of the details from the main code, and operates only if
NO_RECURSE is defined while compiling pcre.c. If PCRE is built using the
"configure" mechanism, "--disable-stack-for-recursion" turns on this way of
operating.
To make it easier for callers to provide specially tailored get/free
functions for this usage, two new functions, pcre_stack_malloc, and
pcre_stack_free, are used. They are always called in strict stacking order,
and the size of block requested is always the same.
The PCRE_CONFIG_STACKRECURSE info parameter can be used to find out whether
PCRE has been compiled to use the stack or the heap for recursion. The
-C option of pcretest uses this to show which version is compiled.
A new data escape \S, is added to pcretest; it causes the amounts of store
obtained and freed by both kinds of malloc/free at match time to be added
to the output.
2. Changed the locale test to use "fr_FR" instead of "fr" because that's
what's available on my current Linux desktop machine.
3. When matching a UTF-8 string, the test for a valid string at the start has
been extended. If start_offset is not zero, PCRE now checks that it points
to a byte that is the start of a UTF-8 character. If not, it returns
PCRE_ERROR_BADUTF8_OFFSET (-11). Note: the whole string is still checked;
this is necessary because there may be backward assertions in the pattern.
When matching the same subject several times, it may save resources to use
PCRE_NO_UTF8_CHECK on all but the first call if the string is long.
4. The code for checking the validity of UTF-8 strings has been tightened so
that it rejects (a) strings containing 0xfe or 0xff bytes and (b) strings
containing "overlong sequences".
5. Fixed a bug (appearing twice) that I could not find any way of exploiting!
I had written "if ((digitab[*p++] && chtab_digit) == 0)" where the "&&"
should have been "&", but it just so happened that all the cases this let
through by mistake were picked up later in the function.
6. I had used a variable called "isblank" - this is a C99 function, causing
some compilers to warn. To avoid this, I renamed it (as "blankclass").
7. Cosmetic: (a) only output another newline at the end of pcretest if it is
prompting; (b) run "./pcretest /dev/null" at the start of the test script
so the version is shown; (c) stop "make test" echoing "./RunTest".
8. Added patches from David Burgess to enable PCRE to run on EBCDIC systems.
9. The prototype for memmove() for systems that don't have it was using
size_t, but the inclusion of the header that defines size_t was later. I've
moved the #includes for the C headers earlier to avoid this.
10. Added some adjustments to the code to make it easier to compiler on certain
special systems:
(a) Some "const" qualifiers were missing.
(b) Added the macro EXPORT before all exported functions; by default this
is defined to be empty.
(c) Changed the dftables auxiliary program (that builds chartables.c) so
that it reads its output file name as an argument instead of writing
to the standard output and assuming this can be redirected.
11. In UTF-8 mode, if a recursive reference (e.g. (?1)) followed a character
class containing characters with values greater than 255, PCRE compilation
went into a loop.
12. A recursive reference to a subpattern that was within another subpattern
that had a minimum quantifier of zero caused PCRE to crash. For example,
(x(y(?2))z)? provoked this bug with a subject that got as far as the
recursion. If the recursively-called subpattern itself had a zero repeat,
that was OK.
13. In pcretest, the buffer for reading a data line was set at 30K, but the
buffer into which it was copied (for escape processing) was still set at
1024, so long lines caused crashes.
14. A pattern such as /[ab]{1,3}+/ failed to compile, giving the error
"internal error: code overflow...". This applied to any character class
that was followed by a possessive quantifier.
15. Modified the Makefile to add libpcre.la as a prerequisite for
libpcreposix.la because I was told this is needed for a parallel build to
work.
16. If a pattern that contained .* following optional items at the start was
studied, the wrong optimizing data was generated, leading to matching
errors. For example, studying /[ab]*.*c/ concluded, erroneously, that any
matching string must start with a or b or c. The correct conclusion for
this pattern is that a match can start with any character.
1. In UTF-8 mode, a character class containing characters with values between
127 and 255 was not handled correctly if the compiled pattern was studied.
In fixing this, I have also improved the studying algorithm for such
classes (slightly).
2. Three internal functions had redundant arguments passed to them. Removal
might give a very teeny performance improvement.
3. Documentation bug: the value of the capture_top field in a callout is *one
more than* the number of the hightest numbered captured substring.
4. The Makefile linked pcretest and pcregrep with -lpcre, which could result
in incorrectly linking with a previously installed version. They now link
explicitly with libpcre.la.
5. configure.in no longer needs to recognize Cygwin specially.
6. A problem in pcre.in for Windows platforms is fixed.
7. If a pattern was successfully studied, and the -d (or /D) flag was given to
pcretest, it used to include the size of the study block as part of its
output. Unfortunately, the structure contains a field that has a different
size on different hardware architectures. This meant that the tests that
showed this size failed. As the block is currently always of a fixed size,
this information isn't actually particularly useful in pcretest output, so
I have just removed it.
8. Three pre-processor statements accidentally did not start in column 1.
Sadly, there are *still* compilers around that complain, even though
standard C has not required this for well over a decade. Sigh.
9. In pcretest, the code for checking callouts passed small integers in the
callout_data field, which is a void * field. However, some picky compilers
complained about the casts involved for this on 64-bit systems. Now
pcretest passes the address of the small integer instead, which should get
rid of the warnings.
10. By default, when in UTF-8 mode, PCRE now checks for valid UTF-8 strings at
both compile and run time, and gives an error if an invalid UTF-8 sequence
is found. There is a option for disabling this check in cases where the
string is known to be correct and/or the maximum performance is wanted.
11. In response to a bug report, I changed one line in Makefile.in from
-Wl,--out-implib,.libs/lib@WIN_PREFIX@pcreposix.dll.a \
to
-Wl,--out-implib,.libs/@WIN_PREFIX@libpcreposix.dll.a \
to look similar to other lines, but I have no way of telling whether this
is the right thing to do, as I do not use Windows. No doubt I'll get told
if it's wrong...
Version 4.3 21-May-03
Refactoring for code improvements. POSIX compat fix (constification).
UTF-8 fixes.
Version 4.2 14-Apr-03
Build fixes. Removed some compiler warnings. UTF-8 fixes.
Version 4.1 12-Mar-03
Compilation fixes. A bug fix, and two optimization fixes.
Highlights of the 4.0 release:
1. Support for Perl's \Q...\E escapes.
2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
package. They provide some syntactic sugar for simple cases of "atomic
grouping".
3. Support for the \G assertion. It is true when the current matching position
is at the start point of the match.
4. A new feature that provides some of the functionality that Perl provides
with (?{...}). The facility is termed a "callout". The way it is done in PCRE
is for the caller to provide an optional function, by setting pcre_callout to
its entry point. To get the function called, the regex must include (?C) at
appropriate points.
5. Support for recursive calls to individual subpatterns. This makes it really
easy to get totally confused.
6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
name a group.
7. Several extensions to UTF-8 support; it is now fairly complete. There is an
option for pcregrep to make it operate in UTF-8 mode.
8. The single man page has been split into a number of separate man pages.
These also give rise to individual HTML pages which are put in a separate
directory. There is an index.html page that lists them all. Some hyperlinking
between the pages has been installed.
buildlink2.mk files back into the main trunk. This provides sufficient
buildlink2 infrastructure to start merging other packages from the
buildlink2 branch that have already been converted to use the buildlink2
framework.
Version 3.7 29-Oct-01
---------------------
1. In updating pcretest to check change 1 of version 3.6, I screwed up.
This caused pcretest, when used on the test data, to segfault. Unfortunately,
this didn't happen under Solaris 8, where I normally test things.
Version 3.6 23-Oct-01
---------------------
1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
offsets passed as NULL with zero offset count.
2. The config.guess and config.sub files had not been updated when I moved to
the latest autoconf.
Version 3.5 15-Aug-01
---------------------
1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
had been forgotten.
2. By using declared but undefined structures, we can avoid using "void"
definitions in pcre.h while keeping the internal definitions of the structures
private.
3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
user point of view, this means that both static and shared libraries are built
by default, but this can be individually controlled. More of the work of
handling this static/shared cases is now inside libtool instead of PCRE's make
file.
4. The pcretest utility is now installed along with pcregrep because it is
useful for users (to test regexs) and by doing this, it automatically gets
relinked by libtool. The documentation has been turned into a man page, so
there are now .1, .txt, and .html versions in /doc.
5. Upgrades to pcregrep:
(i) Added long-form option names like gnu grep.
(ii) Added --help to list all options with an explanatory phrase.
(iii) Added -r, --recursive to recurse into sub-directories.
(iv) Added -f, --file to read patterns from a file.
6. pcre_exec() was referring to its "code" argument before testing that
argument for NULL (and giving an error if it was NULL).
7. Upgraded Makefile.in to allow for compiling in a different directory from
the source directory.
8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
options bits, the pointer it was passed was to an int instead of to an unsigned
long int. This mattered only on 64-bit systems.
9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
generated) instead of pcre.in, which it its source. Also made the same change
in several of the .c files.
10. A new release of gcc defines printf() as a macro, which broke pcretest
because it had an ifdef in the middle of a string argument for printf(). Fixed
by using separate calls to printf().
11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
script, to force use of CR or LF instead of \n in the source. On non-Unix
systems, the value can be set in config.h.
12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
absolute limit. Changed the text of the error message to make this clear, and
likewise updated the man page.
13. The limit of 99 on the number of capturing subpatterns has been removed.
The new limit is 65535, which I hope will not be a "real" limit.
set FOO_CONFIG=${BUILDLINK_CONFIG_WRAPPER.foo} in both CONFIGURE_ENV and
MAKE_ENV. We remove the check for GNU_CONFIGURE because if a package
Makefile includes the buildlink.mk file, then it most likely wants to use
the config script wrappers as well. Change suggested by Hubert Feyrer
(hubertf) and Tomasz Luchowski (zuntum).
BUILDLINK_PREFIX.<pkgname>. This allows buildlink to find X11BASE packages
regardless of whether they were installed before or after xpkgwedge was
installed. Idea by Alistair Crooks <agc@pkgsrc.org>.
Version 3.4 22-Aug-00
---------------------
1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
2. Diagnose condition (?(0) as an error instead of crashing on matching.
Version 3.3 01-Aug-00
---------------------
1. If an octal character was given, but the value was greater than \377, it
was not getting masked to the least significant bits, as documented. This could
lead to crashes in some systems.
2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
3. Added the functions pcre_free_substring() and pcre_free_substring_list().
These just pass their arguments on to (pcre_free)(), but they are provided
because some uses of PCRE bind it to non-C systems that can call its functions,
but cannot call free() or pcre_free() directly.
4. Add "make test" as a synonym for "make check". Corrected some comments in
the Makefile.
5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
Makefile.
6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
command called pgrep for grepping around the active processes.
7. Added the beginnings of support for UTF-8 character strings.
8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
RANLIB to ./ltconfig so that they are used by libtool. I think these are all
the relevant ones. (AR is not passed because ./ltconfig does its own figuring
out for the ar command.)
Version 3.2 12-May-00
---------------------
This is purely a bug fixing release.
1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
of ZA. This was just one example of several cases that could provoke this bug,
which was introduced by change 9 of version 2.00. The code for breaking
infinite loops after an iteration that matches an empty string was't working
correctly.
2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
when matched against abbab (for example). After matching an empty string, it
wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
caused it to match further down the string than it should.
3. The code contained an inclusion of sys/types.h. It isn't clear why this
was there because it doesn't seem to be needed, and it causes trouble on some
systems, as it is not a Standard C header. It has been removed.
4. Made 4 silly changes to the source to avoid stupid compiler warnings that
were reported on the Macintosh. The changes were from
while ((c = *(++ptr)) != 0 && c != '\n');
to
while ((c = *(++ptr)) != 0 && c != '\n') ;
Totally extraordinary, but if that's what it takes...
5. PCRE is being used in one environment where neither memmove() nor bcopy() is
available. Added HAVE_BCOPY and an autoconf test for it; if neither
HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
assumes the way PCRE uses memmove() (always moving upwards).
6. PCRE is being used in one environment where strchr() is not available. There
was only one use in pcre.c, and writing it out to avoid strchr() probably gives
faster code anyway.
Version 3.1 09-Feb-00
---------------------
The only change in this release is the fixing of some bugs in Makefile.in for
the "install" target:
(1) It was failing to install pcreposix.h.
(2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
Version 3.0 01-Feb-00
---------------------
1. Add support for the /+ modifier to perltest (to output $` like it does in
pcretest).
2. Add support for the /g modifier to perltest.
3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
matches null strings.
4. Fix perltest so that it doesn't do unwanted things when fed an empty
pattern. Perl treats empty patterns specially - it reuses the most recent
pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
effect.
5. The POSIX interface was broken in that it was just handing over the POSIX
captured string vector to pcre_exec(), but (since release 2.00) PCRE has
required a bigger vector, with some working space on the end. This means that
the POSIX wrapper now has to get and free some memory, and copy the results.
6. Added some simple autoconf support, placing the test data and the
documentation in separate directories, re-organizing some of the
information files, and making it build pcre-config (a GNU standard). Also added
libtool support for building PCRE as a shared library, which is now the
default.
7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
09 are not valid octal constants. Single digits will be used for minor values
less than 10.
8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
existing programs that set these in the POSIX interface can use PCRE without
modification.
9. Added a new function, pcre_fullinfo() with an extensible interface. It can
return all that pcre_info() returns, plus additional data. The pcre_info()
function is retained for compatibility, but is considered to be obsolete.
10. Added experimental recursion feature (?R) to handle one common case that
Perl 5.6 will be able to do with (?p{...}).
11. Added support for POSIX character classes like [:alpha:], which Perl is
adopting.
1. When startoffset was not zero and the pattern began with ".*", PCRE
was not trying to match at the startoffset position, but instead was
moving forward to the next newline as if a previous match had failed.
2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g
and /G, and could get into a loop if a null string was matched other
than at the start of the subject.
