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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 3.0 02-Jan-02
5    ---------------------
6    
7    1. A bit of extraneous text had somehow crept into the pcregrep documentation.
8    
9    2. If --disable-static was given, the building process failed when trying to
10    build pcretest and pcregrep. (For some reason it was using libtool to compile
11    them, which is not right, as they aren't part of the library.)
12    
13    
14    Version 3.8 18-Dec-01
15    ---------------------
16    
17    1. The experimental UTF-8 code was completely screwed up. It was packing the
18    bytes in the wrong order. How dumb can you get?
19    
20    
21    Version 3.7 29-Oct-01
22    ---------------------
23    
24    1. In updating pcretest to check change 1 of version 3.6, I screwed up.
25    This caused pcretest, when used on the test data, to segfault. Unfortunately,
26    this didn't happen under Solaris 8, where I normally test things.
27    
28    2. The Makefile had to be changed to make it work on BSD systems, where 'make'
29    doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
30    isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
31    this fix an hour or so after the initial 3.7 release.)
32    
33    
34    Version 3.6 23-Oct-01
35    ---------------------
36    
37    1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
38    offsets passed as NULL with zero offset count.
39    
40    2. The config.guess and config.sub files had not been updated when I moved to
41    the latest autoconf.
42    
43    
44    Version 3.5 15-Aug-01
45    ---------------------
46    
47    1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
48    had been forgotten.
49    
50    2. By using declared but undefined structures, we can avoid using "void"
51    definitions in pcre.h while keeping the internal definitions of the structures
52    private.
53    
54    3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
55    user point of view, this means that both static and shared libraries are built
56    by default, but this can be individually controlled. More of the work of
57    handling this static/shared cases is now inside libtool instead of PCRE's make
58    file.
59    
60    4. The pcretest utility is now installed along with pcregrep because it is
61    useful for users (to test regexs) and by doing this, it automatically gets
62    relinked by libtool. The documentation has been turned into a man page, so
63    there are now .1, .txt, and .html versions in /doc.
64    
65    5. Upgrades to pcregrep:
66       (i)   Added long-form option names like gnu grep.
67       (ii)  Added --help to list all options with an explanatory phrase.
68       (iii) Added -r, --recursive to recurse into sub-directories.
69       (iv)  Added -f, --file to read patterns from a file.
70    
71    6. pcre_exec() was referring to its "code" argument before testing that
72    argument for NULL (and giving an error if it was NULL).
73    
74    7. Upgraded Makefile.in to allow for compiling in a different directory from
75    the source directory.
76    
77    8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
78    options bits, the pointer it was passed was to an int instead of to an unsigned
79    long int. This mattered only on 64-bit systems.
80    
81    9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
82    generated) instead of pcre.in, which it its source. Also made the same change
83    in several of the .c files.
84    
85    10. A new release of gcc defines printf() as a macro, which broke pcretest
86    because it had an ifdef in the middle of a string argument for printf(). Fixed
87    by using separate calls to printf().
88    
89    11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
90    script, to force use of CR or LF instead of \n in the source. On non-Unix
91    systems, the value can be set in config.h.
92    
93    12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
94    absolute limit. Changed the text of the error message to make this clear, and
95    likewise updated the man page.
96    
97    13. The limit of 99 on the number of capturing subpatterns has been removed.
98    The new limit is 65535, which I hope will not be a "real" limit.
99    
100    
101    Version 3.4 22-Aug-00
102    ---------------------
103    
104    1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
105    
106    2. Diagnose condition (?(0) as an error instead of crashing on matching.
107    
108    
109    Version 3.3 01-Aug-00
110    ---------------------
111    
112    1. If an octal character was given, but the value was greater than \377, it
113    was not getting masked to the least significant bits, as documented. This could
114    lead to crashes in some systems.
115    
116    2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
117    the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
118    
119    3. Added the functions pcre_free_substring() and pcre_free_substring_list().
120    These just pass their arguments on to (pcre_free)(), but they are provided
121    because some uses of PCRE bind it to non-C systems that can call its functions,
122    but cannot call free() or pcre_free() directly.
123    
124    4. Add "make test" as a synonym for "make check". Corrected some comments in
125    the Makefile.
126    
127    5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
128    Makefile.
129    
130    6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
131    command called pgrep for grepping around the active processes.
132    
133    7. Added the beginnings of support for UTF-8 character strings.
134    
135    8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
136    RANLIB to ./ltconfig so that they are used by libtool. I think these are all
137    the relevant ones. (AR is not passed because ./ltconfig does its own figuring
138    out for the ar command.)
139    
140    
141    Version 3.2 12-May-00
142    ---------------------
143    
144    This is purely a bug fixing release.
145    
146    1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
147    of ZA. This was just one example of several cases that could provoke this bug,
148    which was introduced by change 9 of version 2.00. The code for breaking
149    infinite loops after an iteration that matches an empty string was't working
150    correctly.
151    
152    2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
153    when matched against abbab (for example). After matching an empty string, it
154    wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
155    caused it to match further down the string than it should.
156    
157    3. The code contained an inclusion of sys/types.h. It isn't clear why this
158    was there because it doesn't seem to be needed, and it causes trouble on some
159    systems, as it is not a Standard C header. It has been removed.
160    
161    4. Made 4 silly changes to the source to avoid stupid compiler warnings that
162    were reported on the Macintosh. The changes were from
163    
164      while ((c = *(++ptr)) != 0 && c != '\n');
165    to
166      while ((c = *(++ptr)) != 0 && c != '\n') ;
167    
168    Totally extraordinary, but if that's what it takes...
169    
170    5. PCRE is being used in one environment where neither memmove() nor bcopy() is
171    available. Added HAVE_BCOPY and an autoconf test for it; if neither
172    HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
173    assumes the way PCRE uses memmove() (always moving upwards).
174    
175    6. PCRE is being used in one environment where strchr() is not available. There
176    was only one use in pcre.c, and writing it out to avoid strchr() probably gives
177    faster code anyway.
178    
179    
180    Version 3.1 09-Feb-00
181    ---------------------
182    
183    The only change in this release is the fixing of some bugs in Makefile.in for
184    the "install" target:
185    
186    (1) It was failing to install pcreposix.h.
187    
188    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
189    
190    
191    Version 3.0 01-Feb-00
192    ---------------------
193    
194    1. Add support for the /+ modifier to perltest (to output $` like it does in
195    pcretest).
196    
197    2. Add support for the /g modifier to perltest.
198    
199    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
200    matches null strings.
201    
202    4. Fix perltest so that it doesn't do unwanted things when fed an empty
203    pattern. Perl treats empty patterns specially - it reuses the most recent
204    pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
205    effect.
206    
207    5. The POSIX interface was broken in that it was just handing over the POSIX
208    captured string vector to pcre_exec(), but (since release 2.00) PCRE has
209    required a bigger vector, with some working space on the end. This means that
210    the POSIX wrapper now has to get and free some memory, and copy the results.
211    
212    6. Added some simple autoconf support, placing the test data and the
213    documentation in separate directories, re-organizing some of the
214    information files, and making it build pcre-config (a GNU standard). Also added
215    libtool support for building PCRE as a shared library, which is now the
216    default.
217    
218    7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
219    09 are not valid octal constants. Single digits will be used for minor values
220    less than 10.
221    
222    8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
223    existing programs that set these in the POSIX interface can use PCRE without
224    modification.
225    
226    9. Added a new function, pcre_fullinfo() with an extensible interface. It can
227    return all that pcre_info() returns, plus additional data. The pcre_info()
228    function is retained for compatibility, but is considered to be obsolete.
229    
230    10. Added experimental recursion feature (?R) to handle one common case that
231    Perl 5.6 will be able to do with (?p{...}).
232    
233    11. Added support for POSIX character classes like [:alpha:], which Perl is
234    adopting.
235    
236    
237    Version 2.08 31-Aug-99
238    ----------------------
239    
240    1. When startoffset was not zero and the pattern began with ".*", PCRE was not
241    trying to match at the startoffset position, but instead was moving forward to
242    the next newline as if a previous match had failed.
243    
244    2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
245    and could get into a loop if a null string was matched other than at the start
246    of the subject.
247    
248    3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
249    be distinguished at compile time, and for completeness also added PCRE_DATE.
250    
251    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
252    in GnuWin32 environments.
253    
254    
255    Version 2.07 29-Jul-99
256    ----------------------
257    
258    1. The documentation is now supplied in plain text form and HTML as well as in
259    the form of man page sources.
260    
261    2. C++ compilers don't like assigning (void *) values to other pointer types.
262    In particular this affects malloc(). Although there is no problem in Standard
263    C, I've put in casts to keep C++ compilers happy.
264    
265    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
266    should be (const char *).
267    
268    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
269    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
270    However, I haven't made this a standard facility. The documentation doesn't
271    mention it, and the Makefile doesn't support it.
272    
273    5. The Makefile now contains an "install" target, with editable destinations at
274    the top of the file. The pcretest program is not installed.
275    
276    6. pgrep -V now gives the PCRE version number and date.
277    
278    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
279    causing the entire string to be ignored, instead of just the last character.
280    
281    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
282    non-matching string, it can take a very, very long time, even for strings of
283    quite modest length, because of the nested recursion. PCRE now does better in
284    some of these cases. It does this by remembering the last required literal
285    character in the pattern, and pre-searching the subject to ensure it is present
286    before running the real match. In other words, it applies a heuristic to detect
287    some types of certain failure quickly, and in the above example, if presented
288    with a string that has no trailing " it gives "no match" very quickly.
289    
290    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
291    other alternatives are tried instead.
292    
293    
294    Version 2.06 09-Jun-99
295    ----------------------
296    
297    1. Change pcretest's output for amount of store used to show just the code
298    space, because the remainder (the data block) varies in size between 32-bit and
299    64-bit systems.
300    
301    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
302    start matching at. This allows lookbehinds to work when searching for multiple
303    occurrences in a string.
304    
305    3. Added additional options to pcretest for testing multiple occurrences:
306    
307       /+   outputs the rest of the string that follows a match
308       /g   loops for multiple occurrences, using the new startoffset argument
309       /G   loops for multiple occurrences by passing an incremented pointer
310    
311    4. PCRE wasn't doing the "first character" optimization for patterns starting
312    with \b or \B, though it was doing it for other lookbehind assertions. That is,
313    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
314    the letter 'x'. On long subject strings, this gives a significant speed-up.
315    
316    
317    Version 2.05 21-Apr-99
318    ----------------------
319    
320    1. Changed the type of magic_number from int to long int so that it works
321    properly on 16-bit systems.
322    
323    2. Fixed a bug which caused patterns starting with .* not to work correctly
324    when the subject string contained newline characters. PCRE was assuming
325    anchoring for such patterns in all cases, which is not correct because .* will
326    not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
327    DOTALL is set at top level; otherwise it knows that patterns starting with .*
328    must be retried after every newline in the subject.
329    
330    
331  Version 2.04 18-Feb-99  Version 2.04 18-Feb-99
332  ----------------------  ----------------------

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