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Revision 169 - (show annotations) (download)
Mon Jun 4 10:49:21 2007 UTC (7 years, 5 months ago) by ph10
File size: 128451 byte(s)
Add PCRE_INFO_OKPARTIAL and PCRE_INFO_JCHANGED.

1 ChangeLog for PCRE
2 ------------------
3
4 Version 7.2 01-May-07
5 ---------------------
6
7 1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
8 which is apparently normally available under Windows.
9
10 2. Re-jig the pcregrep tests with different newline settings in an attempt
11 to make them independent of the local environment's newline setting.
12
13 3. Add code to configure.ac to remove -g from the CFLAGS default settings.
14
15 4. Some of the "internals" tests were previously cut out when the link size
16 was not 2, because the output contained actual offsets. The recent new
17 "Z" feature of pcretest means that these can be cut out, making the tests
18 usable with all link sizes.
19
20 5. Implemented Stan Switzer's goto replacement for longjmp() when not using
21 stack recursion. This gives a massive performance boost under BSD, but just
22 a small improvement under Linux. However, it saves one field in the frame
23 in all cases.
24
25 6. Added more features from the forthcoming Perl 5.10:
26
27 (a) (?-n) (where n is a string of digits) is a relative subroutine or
28 recursion call. It refers to the nth most recently opened parentheses.
29
30 (b) (?+n) is also a relative subroutine call; it refers to the nth next
31 to be opened parentheses.
32
33 (c) Conditions that refer to capturing parentheses can be specified
34 relatively, for example, (?(-2)... or (?(+3)...
35
36 (d) \K resets the start of the current match so that everything before
37 is not part of it.
38
39 7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
40 PCRE_INFO_JCHANGED.
41
42
43 Version 7.1 24-Apr-07
44 ---------------------
45
46 1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
47 that is more "standard", making use of automake and other Autotools. There
48 is some re-arrangement of the files and adjustment of comments consequent
49 on this.
50
51 2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
52 for recursive directory scanning broke on some systems because the files
53 are not scanned in any specific order and on different systems the order
54 was different. A call to "sort" has been inserted into RunGrepTest for the
55 approprate test as a short-term fix. In the longer term there may be an
56 alternative.
57
58 3. I had an email from Eric Raymond about problems translating some of PCRE's
59 man pages to HTML (despite the fact that I distribute HTML pages, some
60 people do their own conversions for various reasons). The problems
61 concerned the use of low-level troff macros .br and .in. I have therefore
62 removed all such uses from the man pages (some were redundant, some could
63 be replaced by .nf/.fi pairs). The 132html script that I use to generate
64 HTML has been updated to handle .nf/.fi and to complain if it encounters
65 .br or .in.
66
67 4. Updated comments in configure.ac that get placed in config.h.in and also
68 arranged for config.h to be included in the distribution, with the name
69 config.h.generic, for the benefit of those who have to compile without
70 Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
71
72 5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
73 Weber: (1) pcre_internal.h was missing some function renames; (2) updated
74 makevp.bat for the current PCRE, using the additional files
75 makevp_c.txt, makevp_l.txt, and pcregexp.pas.
76
77 6. A Windows user reported a minor discrepancy with test 2, which turned out
78 to be caused by a trailing space on an input line that had got lost in his
79 copy. The trailing space was an accident, so I've just removed it.
80
81 7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
82 that is needed.
83
84 8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
85 as "const" (a) because they are and (b) because it helps the PHP
86 maintainers who have recently made a script to detect big data structures
87 in the php code that should be moved to the .rodata section. I remembered
88 to update Builducptable as well, so it won't revert if ucptable.h is ever
89 re-created.
90
91 9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
92 pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
93 order to be able to cut out the UTF-8 tables in the latter when UTF-8
94 support is not required. This saves 1.5-2K of code, which is important in
95 some applications.
96
97 Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
98 so as not to refer to the tables, even though these functions will never be
99 called when UTF-8 support is disabled. Otherwise there are problems with a
100 shared library.
101
102 10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
103
104 (a) It was defining its arguments as char * instead of void *.
105
106 (b) It was assuming that all moves were upwards in memory; this was true
107 a long time ago when I wrote it, but is no longer the case.
108
109 The emulated memove() is provided for those environments that have neither
110 memmove() nor bcopy(). I didn't think anyone used it these days, but that
111 is clearly not the case, as these two bugs were recently reported.
112
113 11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
114 and Detrail to create the HTML documentation, the .txt form of the man
115 pages, and it removes trailing spaces from listed files. It also creates
116 pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
117 case, it wraps all the #defines with #ifndefs. This script should be run
118 before "make dist".
119
120 12. Fixed two fairly obscure bugs concerned with quantified caseless matching
121 with Unicode property support.
122
123 (a) For a maximizing quantifier, if the two different cases of the
124 character were of different lengths in their UTF-8 codings (there are
125 some cases like this - I found 11), and the matching function had to
126 back up over a mixture of the two cases, it incorrectly assumed they
127 were both the same length.
128
129 (b) When PCRE was configured to use the heap rather than the stack for
130 recursion during matching, it was not correctly preserving the data for
131 the other case of a UTF-8 character when checking ahead for a match
132 while processing a minimizing repeat. If the check also involved
133 matching a wide character, but failed, corruption could cause an
134 erroneous result when trying to check for a repeat of the original
135 character.
136
137 13. Some tidying changes to the testing mechanism:
138
139 (a) The RunTest script now detects the internal link size and whether there
140 is UTF-8 and UCP support by running ./pcretest -C instead of relying on
141 values substituted by "configure". (The RunGrepTest script already did
142 this for UTF-8.) The configure.ac script no longer substitutes the
143 relevant variables.
144
145 (b) The debugging options /B and /D in pcretest show the compiled bytecode
146 with length and offset values. This means that the output is different
147 for different internal link sizes. Test 2 is skipped for link sizes
148 other than 2 because of this, bypassing the problem. Unfortunately,
149 there was also a test in test 3 (the locale tests) that used /B and
150 failed for link sizes other than 2. Rather than cut the whole test out,
151 I have added a new /Z option to pcretest that replaces the length and
152 offset values with spaces. This is now used to make test 3 independent
153 of link size. (Test 2 will be tidied up later.)
154
155 14. If erroroffset was passed as NULL to pcre_compile, it provoked a
156 segmentation fault instead of returning the appropriate error message.
157
158 15. In multiline mode when the newline sequence was set to "any", the pattern
159 ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
160 This doesn't seem right; it now treats the CRLF combination as the line
161 ending, and so does not match in that case. It's only a pattern such as ^$
162 that would hit this one: something like ^ABC$ would have failed after \r
163 and then tried again after \r\n.
164
165 16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
166 in an attempt to make files that differ only in their line terminators
167 compare equal. This works on Linux.
168
169 17. Under certain error circumstances pcregrep might try to free random memory
170 as it exited. This is now fixed, thanks to valgrind.
171
172 19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
173 "abc\r\n\r\n", it found an unwanted second match after the second \r. This
174 was because its rules for how to advance for /g after matching an empty
175 string at the end of a line did not allow for this case. They now check for
176 it specially.
177
178 20. pcretest is supposed to handle patterns and data of any length, by
179 extending its buffers when necessary. It was getting this wrong when the
180 buffer for a data line had to be extended.
181
182 21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
183 CRLF as a newline sequence.
184
185 22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
186 out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
187 I have nevertheless tidied it up.
188
189 23. Added some casts to kill warnings from HP-UX ia64 compiler.
190
191 24. Added a man page for pcre-config.
192
193
194 Version 7.0 19-Dec-06
195 ---------------------
196
197 1. Fixed a signed/unsigned compiler warning in pcre_compile.c, shown up by
198 moving to gcc 4.1.1.
199
200 2. The -S option for pcretest uses setrlimit(); I had omitted to #include
201 sys/time.h, which is documented as needed for this function. It doesn't
202 seem to matter on Linux, but it showed up on some releases of OS X.
203
204 3. It seems that there are systems where bytes whose values are greater than
205 127 match isprint() in the "C" locale. The "C" locale should be the
206 default when a C program starts up. In most systems, only ASCII printing
207 characters match isprint(). This difference caused the output from pcretest
208 to vary, making some of the tests fail. I have changed pcretest so that:
209
210 (a) When it is outputting text in the compiled version of a pattern, bytes
211 other than 32-126 are always shown as hex escapes.
212
213 (b) When it is outputting text that is a matched part of a subject string,
214 it does the same, unless a different locale has been set for the match
215 (using the /L modifier). In this case, it uses isprint() to decide.
216
217 4. Fixed a major bug that caused incorrect computation of the amount of memory
218 required for a compiled pattern when options that changed within the
219 pattern affected the logic of the preliminary scan that determines the
220 length. The relevant options are -x, and -i in UTF-8 mode. The result was
221 that the computed length was too small. The symptoms of this bug were
222 either the PCRE error "internal error: code overflow" from pcre_compile(),
223 or a glibc crash with a message such as "pcretest: free(): invalid next
224 size (fast)". Examples of patterns that provoked this bug (shown in
225 pcretest format) are:
226
227 /(?-x: )/x
228 /(?x)(?-x: \s*#\s*)/
229 /((?i)[\x{c0}])/8
230 /(?i:[\x{c0}])/8
231
232 HOWEVER: Change 17 below makes this fix obsolete as the memory computation
233 is now done differently.
234
235 5. Applied patches from Google to: (a) add a QuoteMeta function to the C++
236 wrapper classes; (b) implement a new function in the C++ scanner that is
237 more efficient than the old way of doing things because it avoids levels of
238 recursion in the regex matching; (c) add a paragraph to the documentation
239 for the FullMatch() function.
240
241 6. The escape sequence \n was being treated as whatever was defined as
242 "newline". Not only was this contrary to the documentation, which states
243 that \n is character 10 (hex 0A), but it also went horribly wrong when
244 "newline" was defined as CRLF. This has been fixed.
245
246 7. In pcre_dfa_exec.c the value of an unsigned integer (the variable called c)
247 was being set to -1 for the "end of line" case (supposedly a value that no
248 character can have). Though this value is never used (the check for end of
249 line is "zero bytes in current character"), it caused compiler complaints.
250 I've changed it to 0xffffffff.
251
252 8. In pcre_version.c, the version string was being built by a sequence of
253 C macros that, in the event of PCRE_PRERELEASE being defined as an empty
254 string (as it is for production releases) called a macro with an empty
255 argument. The C standard says the result of this is undefined. The gcc
256 compiler treats it as an empty string (which was what was wanted) but it is
257 reported that Visual C gives an error. The source has been hacked around to
258 avoid this problem.
259
260 9. On the advice of a Windows user, included <io.h> and <fcntl.h> in Windows
261 builds of pcretest, and changed the call to _setmode() to use _O_BINARY
262 instead of 0x8000. Made all the #ifdefs test both _WIN32 and WIN32 (not all
263 of them did).
264
265 10. Originally, pcretest opened its input and output without "b"; then I was
266 told that "b" was needed in some environments, so it was added for release
267 5.0 to both the input and output. (It makes no difference on Unix-like
268 systems.) Later I was told that it is wrong for the input on Windows. I've
269 now abstracted the modes into two macros, to make it easier to fiddle with
270 them, and removed "b" from the input mode under Windows.
271
272 11. Added pkgconfig support for the C++ wrapper library, libpcrecpp.
273
274 12. Added -help and --help to pcretest as an official way of being reminded
275 of the options.
276
277 13. Removed some redundant semicolons after macro calls in pcrecpparg.h.in
278 and pcrecpp.cc because they annoy compilers at high warning levels.
279
280 14. A bit of tidying/refactoring in pcre_exec.c in the main bumpalong loop.
281
282 15. Fixed an occurrence of == in configure.ac that should have been = (shell
283 scripts are not C programs :-) and which was not noticed because it works
284 on Linux.
285
286 16. pcretest is supposed to handle any length of pattern and data line (as one
287 line or as a continued sequence of lines) by extending its input buffer if
288 necessary. This feature was broken for very long pattern lines, leading to
289 a string of junk being passed to pcre_compile() if the pattern was longer
290 than about 50K.
291
292 17. I have done a major re-factoring of the way pcre_compile() computes the
293 amount of memory needed for a compiled pattern. Previously, there was code
294 that made a preliminary scan of the pattern in order to do this. That was
295 OK when PCRE was new, but as the facilities have expanded, it has become
296 harder and harder to keep it in step with the real compile phase, and there
297 have been a number of bugs (see for example, 4 above). I have now found a
298 cunning way of running the real compile function in a "fake" mode that
299 enables it to compute how much memory it would need, while actually only
300 ever using a few hundred bytes of working memory and without too many
301 tests of the mode. This should make future maintenance and development
302 easier. A side effect of this work is that the limit of 200 on the nesting
303 depth of parentheses has been removed (though this was never a serious
304 limitation, I suspect). However, there is a downside: pcre_compile() now
305 runs more slowly than before (30% or more, depending on the pattern). I
306 hope this isn't a big issue. There is no effect on runtime performance.
307
308 18. Fixed a minor bug in pcretest: if a pattern line was not terminated by a
309 newline (only possible for the last line of a file) and it was a
310 pattern that set a locale (followed by /Lsomething), pcretest crashed.
311
312 19. Added additional timing features to pcretest. (1) The -tm option now times
313 matching only, not compiling. (2) Both -t and -tm can be followed, as a
314 separate command line item, by a number that specifies the number of
315 repeats to use when timing. The default is 50000; this gives better
316 precision, but takes uncomfortably long for very large patterns.
317
318 20. Extended pcre_study() to be more clever in cases where a branch of a
319 subpattern has no definite first character. For example, (a*|b*)[cd] would
320 previously give no result from pcre_study(). Now it recognizes that the
321 first character must be a, b, c, or d.
322
323 21. There was an incorrect error "recursive call could loop indefinitely" if
324 a subpattern (or the entire pattern) that was being tested for matching an
325 empty string contained only one non-empty item after a nested subpattern.
326 For example, the pattern (?>\x{100}*)\d(?R) provoked this error
327 incorrectly, because the \d was being skipped in the check.
328
329 22. The pcretest program now has a new pattern option /B and a command line
330 option -b, which is equivalent to adding /B to every pattern. This causes
331 it to show the compiled bytecode, without the additional information that
332 -d shows. The effect of -d is now the same as -b with -i (and similarly, /D
333 is the same as /B/I).
334
335 23. A new optimization is now able automatically to treat some sequences such
336 as a*b as a*+b. More specifically, if something simple (such as a character
337 or a simple class like \d) has an unlimited quantifier, and is followed by
338 something that cannot possibly match the quantified thing, the quantifier
339 is automatically "possessified".
340
341 24. A recursive reference to a subpattern whose number was greater than 39
342 went wrong under certain circumstances in UTF-8 mode. This bug could also
343 have affected the operation of pcre_study().
344
345 25. Realized that a little bit of performance could be had by replacing
346 (c & 0xc0) == 0xc0 with c >= 0xc0 when processing UTF-8 characters.
347
348 26. Timing data from pcretest is now shown to 4 decimal places instead of 3.
349
350 27. Possessive quantifiers such as a++ were previously implemented by turning
351 them into atomic groups such as ($>a+). Now they have their own opcodes,
352 which improves performance. This includes the automatically created ones
353 from 23 above.
354
355 28. A pattern such as (?=(\w+))\1: which simulates an atomic group using a
356 lookahead was broken if it was not anchored. PCRE was mistakenly expecting
357 the first matched character to be a colon. This applied both to named and
358 numbered groups.
359
360 29. The ucpinternal.h header file was missing its idempotency #ifdef.
361
362 30. I was sent a "project" file called libpcre.a.dev which I understand makes
363 building PCRE on Windows easier, so I have included it in the distribution.
364
365 31. There is now a check in pcretest against a ridiculously large number being
366 returned by pcre_exec() or pcre_dfa_exec(). If this happens in a /g or /G
367 loop, the loop is abandoned.
368
369 32. Forward references to subpatterns in conditions such as (?(2)...) where
370 subpattern 2 is defined later cause pcre_compile() to search forwards in
371 the pattern for the relevant set of parentheses. This search went wrong
372 when there were unescaped parentheses in a character class, parentheses
373 escaped with \Q...\E, or parentheses in a #-comment in /x mode.
374
375 33. "Subroutine" calls and backreferences were previously restricted to
376 referencing subpatterns earlier in the regex. This restriction has now
377 been removed.
378
379 34. Added a number of extra features that are going to be in Perl 5.10. On the
380 whole, these are just syntactic alternatives for features that PCRE had
381 previously implemented using the Python syntax or my own invention. The
382 other formats are all retained for compatibility.
383
384 (a) Named groups can now be defined as (?<name>...) or (?'name'...) as well
385 as (?P<name>...). The new forms, as well as being in Perl 5.10, are
386 also .NET compatible.
387
388 (b) A recursion or subroutine call to a named group can now be defined as
389 (?&name) as well as (?P>name).
390
391 (c) A backreference to a named group can now be defined as \k<name> or
392 \k'name' as well as (?P=name). The new forms, as well as being in Perl
393 5.10, are also .NET compatible.
394
395 (d) A conditional reference to a named group can now use the syntax
396 (?(<name>) or (?('name') as well as (?(name).
397
398 (e) A "conditional group" of the form (?(DEFINE)...) can be used to define
399 groups (named and numbered) that are never evaluated inline, but can be
400 called as "subroutines" from elsewhere. In effect, the DEFINE condition
401 is always false. There may be only one alternative in such a group.
402
403 (f) A test for recursion can be given as (?(R1).. or (?(R&name)... as well
404 as the simple (?(R). The condition is true only if the most recent
405 recursion is that of the given number or name. It does not search out
406 through the entire recursion stack.
407
408 (g) The escape \gN or \g{N} has been added, where N is a positive or
409 negative number, specifying an absolute or relative reference.
410
411 35. Tidied to get rid of some further signed/unsigned compiler warnings and
412 some "unreachable code" warnings.
413
414 36. Updated the Unicode property tables to Unicode version 5.0.0. Amongst other
415 things, this adds five new scripts.
416
417 37. Perl ignores orphaned \E escapes completely. PCRE now does the same.
418 There were also incompatibilities regarding the handling of \Q..\E inside
419 character classes, for example with patterns like [\Qa\E-\Qz\E] where the
420 hyphen was adjacent to \Q or \E. I hope I've cleared all this up now.
421
422 38. Like Perl, PCRE detects when an indefinitely repeated parenthesized group
423 matches an empty string, and forcibly breaks the loop. There were bugs in
424 this code in non-simple cases. For a pattern such as ^(a()*)* matched
425 against aaaa the result was just "a" rather than "aaaa", for example. Two
426 separate and independent bugs (that affected different cases) have been
427 fixed.
428
429 39. Refactored the code to abolish the use of different opcodes for small
430 capturing bracket numbers. This is a tidy that I avoided doing when I
431 removed the limit on the number of capturing brackets for 3.5 back in 2001.
432 The new approach is not only tidier, it makes it possible to reduce the
433 memory needed to fix the previous bug (38).
434
435 40. Implemented PCRE_NEWLINE_ANY to recognize any of the Unicode newline
436 sequences (http://unicode.org/unicode/reports/tr18/) as "newline" when
437 processing dot, circumflex, or dollar metacharacters, or #-comments in /x
438 mode.
439
440 41. Add \R to match any Unicode newline sequence, as suggested in the Unicode
441 report.
442
443 42. Applied patch, originally from Ari Pollak, modified by Google, to allow
444 copy construction and assignment in the C++ wrapper.
445
446 43. Updated pcregrep to support "--newline=any". In the process, I fixed a
447 couple of bugs that could have given wrong results in the "--newline=crlf"
448 case.
449
450 44. Added a number of casts and did some reorganization of signed/unsigned int
451 variables following suggestions from Dair Grant. Also renamed the variable
452 "this" as "item" because it is a C++ keyword.
453
454 45. Arranged for dftables to add
455
456 #include "pcre_internal.h"
457
458 to pcre_chartables.c because without it, gcc 4.x may remove the array
459 definition from the final binary if PCRE is built into a static library and
460 dead code stripping is activated.
461
462 46. For an unanchored pattern, if a match attempt fails at the start of a
463 newline sequence, and the newline setting is CRLF or ANY, and the next two
464 characters are CRLF, advance by two characters instead of one.
465
466
467 Version 6.7 04-Jul-06
468 ---------------------
469
470 1. In order to handle tests when input lines are enormously long, pcretest has
471 been re-factored so that it automatically extends its buffers when
472 necessary. The code is crude, but this _is_ just a test program. The
473 default size has been increased from 32K to 50K.
474
475 2. The code in pcre_study() was using the value of the re argument before
476 testing it for NULL. (Of course, in any sensible call of the function, it
477 won't be NULL.)
478
479 3. The memmove() emulation function in pcre_internal.h, which is used on
480 systems that lack both memmove() and bcopy() - that is, hardly ever -
481 was missing a "static" storage class specifier.
482
483 4. When UTF-8 mode was not set, PCRE looped when compiling certain patterns
484 containing an extended class (one that cannot be represented by a bitmap
485 because it contains high-valued characters or Unicode property items, e.g.
486 [\pZ]). Almost always one would set UTF-8 mode when processing such a
487 pattern, but PCRE should not loop if you do not (it no longer does).
488 [Detail: two cases were found: (a) a repeated subpattern containing an
489 extended class; (b) a recursive reference to a subpattern that followed a
490 previous extended class. It wasn't skipping over the extended class
491 correctly when UTF-8 mode was not set.]
492
493 5. A negated single-character class was not being recognized as fixed-length
494 in lookbehind assertions such as (?<=[^f]), leading to an incorrect
495 compile error "lookbehind assertion is not fixed length".
496
497 6. The RunPerlTest auxiliary script was showing an unexpected difference
498 between PCRE and Perl for UTF-8 tests. It turns out that it is hard to
499 write a Perl script that can interpret lines of an input file either as
500 byte characters or as UTF-8, which is what "perltest" was being required to
501 do for the non-UTF-8 and UTF-8 tests, respectively. Essentially what you
502 can't do is switch easily at run time between having the "use utf8;" pragma
503 or not. In the end, I fudged it by using the RunPerlTest script to insert
504 "use utf8;" explicitly for the UTF-8 tests.
505
506 7. In multiline (/m) mode, PCRE was matching ^ after a terminating newline at
507 the end of the subject string, contrary to the documentation and to what
508 Perl does. This was true of both matching functions. Now it matches only at
509 the start of the subject and immediately after *internal* newlines.
510
511 8. A call of pcre_fullinfo() from pcretest to get the option bits was passing
512 a pointer to an int instead of a pointer to an unsigned long int. This
513 caused problems on 64-bit systems.
514
515 9. Applied a patch from the folks at Google to pcrecpp.cc, to fix "another
516 instance of the 'standard' template library not being so standard".
517
518 10. There was no check on the number of named subpatterns nor the maximum
519 length of a subpattern name. The product of these values is used to compute
520 the size of the memory block for a compiled pattern. By supplying a very
521 long subpattern name and a large number of named subpatterns, the size
522 computation could be caused to overflow. This is now prevented by limiting
523 the length of names to 32 characters, and the number of named subpatterns
524 to 10,000.
525
526 11. Subpatterns that are repeated with specific counts have to be replicated in
527 the compiled pattern. The size of memory for this was computed from the
528 length of the subpattern and the repeat count. The latter is limited to
529 65535, but there was no limit on the former, meaning that integer overflow
530 could in principle occur. The compiled length of a repeated subpattern is
531 now limited to 30,000 bytes in order to prevent this.
532
533 12. Added the optional facility to have named substrings with the same name.
534
535 13. Added the ability to use a named substring as a condition, using the
536 Python syntax: (?(name)yes|no). This overloads (?(R)... and names that
537 are numbers (not recommended). Forward references are permitted.
538
539 14. Added forward references in named backreferences (if you see what I mean).
540
541 15. In UTF-8 mode, with the PCRE_DOTALL option set, a quantified dot in the
542 pattern could run off the end of the subject. For example, the pattern
543 "(?s)(.{1,5})"8 did this with the subject "ab".
544
545 16. If PCRE_DOTALL or PCRE_MULTILINE were set, pcre_dfa_exec() behaved as if
546 PCRE_CASELESS was set when matching characters that were quantified with ?
547 or *.
548
549 17. A character class other than a single negated character that had a minimum
550 but no maximum quantifier - for example [ab]{6,} - was not handled
551 correctly by pce_dfa_exec(). It would match only one character.
552
553 18. A valid (though odd) pattern that looked like a POSIX character
554 class but used an invalid character after [ (for example [[,abc,]]) caused
555 pcre_compile() to give the error "Failed: internal error: code overflow" or
556 in some cases to crash with a glibc free() error. This could even happen if
557 the pattern terminated after [[ but there just happened to be a sequence of
558 letters, a binary zero, and a closing ] in the memory that followed.
559
560 19. Perl's treatment of octal escapes in the range \400 to \777 has changed
561 over the years. Originally (before any Unicode support), just the bottom 8
562 bits were taken. Thus, for example, \500 really meant \100. Nowadays the
563 output from "man perlunicode" includes this:
564
565 The regular expression compiler produces polymorphic opcodes. That
566 is, the pattern adapts to the data and automatically switches to
567 the Unicode character scheme when presented with Unicode data--or
568 instead uses a traditional byte scheme when presented with byte
569 data.
570
571 Sadly, a wide octal escape does not cause a switch, and in a string with
572 no other multibyte characters, these octal escapes are treated as before.
573 Thus, in Perl, the pattern /\500/ actually matches \100 but the pattern
574 /\500|\x{1ff}/ matches \500 or \777 because the whole thing is treated as a
575 Unicode string.
576
577 I have not perpetrated such confusion in PCRE. Up till now, it took just
578 the bottom 8 bits, as in old Perl. I have now made octal escapes with
579 values greater than \377 illegal in non-UTF-8 mode. In UTF-8 mode they
580 translate to the appropriate multibyte character.
581
582 29. Applied some refactoring to reduce the number of warnings from Microsoft
583 and Borland compilers. This has included removing the fudge introduced
584 seven years ago for the OS/2 compiler (see 2.02/2 below) because it caused
585 a warning about an unused variable.
586
587 21. PCRE has not included VT (character 0x0b) in the set of whitespace
588 characters since release 4.0, because Perl (from release 5.004) does not.
589 [Or at least, is documented not to: some releases seem to be in conflict
590 with the documentation.] However, when a pattern was studied with
591 pcre_study() and all its branches started with \s, PCRE still included VT
592 as a possible starting character. Of course, this did no harm; it just
593 caused an unnecessary match attempt.
594
595 22. Removed a now-redundant internal flag bit that recorded the fact that case
596 dependency changed within the pattern. This was once needed for "required
597 byte" processing, but is no longer used. This recovers a now-scarce options
598 bit. Also moved the least significant internal flag bit to the most-
599 significant bit of the word, which was not previously used (hangover from
600 the days when it was an int rather than a uint) to free up another bit for
601 the future.
602
603 23. Added support for CRLF line endings as well as CR and LF. As well as the
604 default being selectable at build time, it can now be changed at runtime
605 via the PCRE_NEWLINE_xxx flags. There are now options for pcregrep to
606 specify that it is scanning data with non-default line endings.
607
608 24. Changed the definition of CXXLINK to make it agree with the definition of
609 LINK in the Makefile, by replacing LDFLAGS to CXXFLAGS.
610
611 25. Applied Ian Taylor's patches to avoid using another stack frame for tail
612 recursions. This makes a big different to stack usage for some patterns.
613
614 26. If a subpattern containing a named recursion or subroutine reference such
615 as (?P>B) was quantified, for example (xxx(?P>B)){3}, the calculation of
616 the space required for the compiled pattern went wrong and gave too small a
617 value. Depending on the environment, this could lead to "Failed: internal
618 error: code overflow at offset 49" or "glibc detected double free or
619 corruption" errors.
620
621 27. Applied patches from Google (a) to support the new newline modes and (b) to
622 advance over multibyte UTF-8 characters in GlobalReplace.
623
624 28. Change free() to pcre_free() in pcredemo.c. Apparently this makes a
625 difference for some implementation of PCRE in some Windows version.
626
627 29. Added some extra testing facilities to pcretest:
628
629 \q<number> in a data line sets the "match limit" value
630 \Q<number> in a data line sets the "match recursion limt" value
631 -S <number> sets the stack size, where <number> is in megabytes
632
633 The -S option isn't available for Windows.
634
635
636 Version 6.6 06-Feb-06
637 ---------------------
638
639 1. Change 16(a) for 6.5 broke things, because PCRE_DATA_SCOPE was not defined
640 in pcreposix.h. I have copied the definition from pcre.h.
641
642 2. Change 25 for 6.5 broke compilation in a build directory out-of-tree
643 because pcre.h is no longer a built file.
644
645 3. Added Jeff Friedl's additional debugging patches to pcregrep. These are
646 not normally included in the compiled code.
647
648
649 Version 6.5 01-Feb-06
650 ---------------------
651
652 1. When using the partial match feature with pcre_dfa_exec(), it was not
653 anchoring the second and subsequent partial matches at the new starting
654 point. This could lead to incorrect results. For example, with the pattern
655 /1234/, partially matching against "123" and then "a4" gave a match.
656
657 2. Changes to pcregrep:
658
659 (a) All non-match returns from pcre_exec() were being treated as failures
660 to match the line. Now, unless the error is PCRE_ERROR_NOMATCH, an
661 error message is output. Some extra information is given for the
662 PCRE_ERROR_MATCHLIMIT and PCRE_ERROR_RECURSIONLIMIT errors, which are
663 probably the only errors that are likely to be caused by users (by
664 specifying a regex that has nested indefinite repeats, for instance).
665 If there are more than 20 of these errors, pcregrep is abandoned.
666
667 (b) A binary zero was treated as data while matching, but terminated the
668 output line if it was written out. This has been fixed: binary zeroes
669 are now no different to any other data bytes.
670
671 (c) Whichever of the LC_ALL or LC_CTYPE environment variables is set is
672 used to set a locale for matching. The --locale=xxxx long option has
673 been added (no short equivalent) to specify a locale explicitly on the
674 pcregrep command, overriding the environment variables.
675
676 (d) When -B was used with -n, some line numbers in the output were one less
677 than they should have been.
678
679 (e) Added the -o (--only-matching) option.
680
681 (f) If -A or -C was used with -c (count only), some lines of context were
682 accidentally printed for the final match.
683
684 (g) Added the -H (--with-filename) option.
685
686 (h) The combination of options -rh failed to suppress file names for files
687 that were found from directory arguments.
688
689 (i) Added the -D (--devices) and -d (--directories) options.
690
691 (j) Added the -F (--fixed-strings) option.
692
693 (k) Allow "-" to be used as a file name for -f as well as for a data file.
694
695 (l) Added the --colo(u)r option.
696
697 (m) Added Jeffrey Friedl's -S testing option, but within #ifdefs so that it
698 is not present by default.
699
700 3. A nasty bug was discovered in the handling of recursive patterns, that is,
701 items such as (?R) or (?1), when the recursion could match a number of
702 alternatives. If it matched one of the alternatives, but subsequently,
703 outside the recursion, there was a failure, the code tried to back up into
704 the recursion. However, because of the way PCRE is implemented, this is not
705 possible, and the result was an incorrect result from the match.
706
707 In order to prevent this happening, the specification of recursion has
708 been changed so that all such subpatterns are automatically treated as
709 atomic groups. Thus, for example, (?R) is treated as if it were (?>(?R)).
710
711 4. I had overlooked the fact that, in some locales, there are characters for
712 which isalpha() is true but neither isupper() nor islower() are true. In
713 the fr_FR locale, for instance, the \xAA and \xBA characters (ordmasculine
714 and ordfeminine) are like this. This affected the treatment of \w and \W
715 when they appeared in character classes, but not when they appeared outside
716 a character class. The bit map for "word" characters is now created
717 separately from the results of isalnum() instead of just taking it from the
718 upper, lower, and digit maps. (Plus the underscore character, of course.)
719
720 5. The above bug also affected the handling of POSIX character classes such as
721 [[:alpha:]] and [[:alnum:]]. These do not have their own bit maps in PCRE's
722 permanent tables. Instead, the bit maps for such a class were previously
723 created as the appropriate unions of the upper, lower, and digit bitmaps.
724 Now they are created by subtraction from the [[:word:]] class, which has
725 its own bitmap.
726
727 6. The [[:blank:]] character class matches horizontal, but not vertical space.
728 It is created by subtracting the vertical space characters (\x09, \x0a,
729 \x0b, \x0c) from the [[:space:]] bitmap. Previously, however, the
730 subtraction was done in the overall bitmap for a character class, meaning
731 that a class such as [\x0c[:blank:]] was incorrect because \x0c would not
732 be recognized. This bug has been fixed.
733
734 7. Patches from the folks at Google:
735
736 (a) pcrecpp.cc: "to handle a corner case that may or may not happen in
737 real life, but is still worth protecting against".
738
739 (b) pcrecpp.cc: "corrects a bug when negative radixes are used with
740 regular expressions".
741
742 (c) pcre_scanner.cc: avoid use of std::count() because not all systems
743 have it.
744
745 (d) Split off pcrecpparg.h from pcrecpp.h and had the former built by
746 "configure" and the latter not, in order to fix a problem somebody had
747 with compiling the Arg class on HP-UX.
748
749 (e) Improve the error-handling of the C++ wrapper a little bit.
750
751 (f) New tests for checking recursion limiting.
752
753 8. The pcre_memmove() function, which is used only if the environment does not
754 have a standard memmove() function (and is therefore rarely compiled),
755 contained two bugs: (a) use of int instead of size_t, and (b) it was not
756 returning a result (though PCRE never actually uses the result).
757
758 9. In the POSIX regexec() interface, if nmatch is specified as a ridiculously
759 large number - greater than INT_MAX/(3*sizeof(int)) - REG_ESPACE is
760 returned instead of calling malloc() with an overflowing number that would
761 most likely cause subsequent chaos.
762
763 10. The debugging option of pcretest was not showing the NO_AUTO_CAPTURE flag.
764
765 11. The POSIX flag REG_NOSUB is now supported. When a pattern that was compiled
766 with this option is matched, the nmatch and pmatch options of regexec() are
767 ignored.
768
769 12. Added REG_UTF8 to the POSIX interface. This is not defined by POSIX, but is
770 provided in case anyone wants to the the POSIX interface with UTF-8
771 strings.
772
773 13. Added CXXLDFLAGS to the Makefile parameters to provide settings only on the
774 C++ linking (needed for some HP-UX environments).
775
776 14. Avoid compiler warnings in get_ucpname() when compiled without UCP support
777 (unused parameter) and in the pcre_printint() function (omitted "default"
778 switch label when the default is to do nothing).
779
780 15. Added some code to make it possible, when PCRE is compiled as a C++
781 library, to replace subject pointers for pcre_exec() with a smart pointer
782 class, thus making it possible to process discontinuous strings.
783
784 16. The two macros PCRE_EXPORT and PCRE_DATA_SCOPE are confusing, and perform
785 much the same function. They were added by different people who were trying
786 to make PCRE easy to compile on non-Unix systems. It has been suggested
787 that PCRE_EXPORT be abolished now that there is more automatic apparatus
788 for compiling on Windows systems. I have therefore replaced it with
789 PCRE_DATA_SCOPE. This is set automatically for Windows; if not set it
790 defaults to "extern" for C or "extern C" for C++, which works fine on
791 Unix-like systems. It is now possible to override the value of PCRE_DATA_
792 SCOPE with something explicit in config.h. In addition:
793
794 (a) pcreposix.h still had just "extern" instead of either of these macros;
795 I have replaced it with PCRE_DATA_SCOPE.
796
797 (b) Functions such as _pcre_xclass(), which are internal to the library,
798 but external in the C sense, all had PCRE_EXPORT in their definitions.
799 This is apparently wrong for the Windows case, so I have removed it.
800 (It makes no difference on Unix-like systems.)
801
802 17. Added a new limit, MATCH_LIMIT_RECURSION, which limits the depth of nesting
803 of recursive calls to match(). This is different to MATCH_LIMIT because
804 that limits the total number of calls to match(), not all of which increase
805 the depth of recursion. Limiting the recursion depth limits the amount of
806 stack (or heap if NO_RECURSE is set) that is used. The default can be set
807 when PCRE is compiled, and changed at run time. A patch from Google adds
808 this functionality to the C++ interface.
809
810 18. Changes to the handling of Unicode character properties:
811
812 (a) Updated the table to Unicode 4.1.0.
813
814 (b) Recognize characters that are not in the table as "Cn" (undefined).
815
816 (c) I revised the way the table is implemented to a much improved format
817 which includes recognition of ranges. It now supports the ranges that
818 are defined in UnicodeData.txt, and it also amalgamates other
819 characters into ranges. This has reduced the number of entries in the
820 table from around 16,000 to around 3,000, thus reducing its size
821 considerably. I realized I did not need to use a tree structure after
822 all - a binary chop search is just as efficient. Having reduced the
823 number of entries, I extended their size from 6 bytes to 8 bytes to
824 allow for more data.
825
826 (d) Added support for Unicode script names via properties such as \p{Han}.
827
828 19. In UTF-8 mode, a backslash followed by a non-Ascii character was not
829 matching that character.
830
831 20. When matching a repeated Unicode property with a minimum greater than zero,
832 (for example \pL{2,}), PCRE could look past the end of the subject if it
833 reached it while seeking the minimum number of characters. This could
834 happen only if some of the characters were more than one byte long, because
835 there is a check for at least the minimum number of bytes.
836
837 21. Refactored the implementation of \p and \P so as to be more general, to
838 allow for more different types of property in future. This has changed the
839 compiled form incompatibly. Anybody with saved compiled patterns that use
840 \p or \P will have to recompile them.
841
842 22. Added "Any" and "L&" to the supported property types.
843
844 23. Recognize \x{...} as a code point specifier, even when not in UTF-8 mode,
845 but give a compile time error if the value is greater than 0xff.
846
847 24. The man pages for pcrepartial, pcreprecompile, and pcre_compile2 were
848 accidentally not being installed or uninstalled.
849
850 25. The pcre.h file was built from pcre.h.in, but the only changes that were
851 made were to insert the current release number. This seemed silly, because
852 it made things harder for people building PCRE on systems that don't run
853 "configure". I have turned pcre.h into a distributed file, no longer built
854 by "configure", with the version identification directly included. There is
855 no longer a pcre.h.in file.
856
857 However, this change necessitated a change to the pcre-config script as
858 well. It is built from pcre-config.in, and one of the substitutions was the
859 release number. I have updated configure.ac so that ./configure now finds
860 the release number by grepping pcre.h.
861
862 26. Added the ability to run the tests under valgrind.
863
864
865 Version 6.4 05-Sep-05
866 ---------------------
867
868 1. Change 6.0/10/(l) to pcregrep introduced a bug that caused separator lines
869 "--" to be printed when multiple files were scanned, even when none of the
870 -A, -B, or -C options were used. This is not compatible with Gnu grep, so I
871 consider it to be a bug, and have restored the previous behaviour.
872
873 2. A couple of code tidies to get rid of compiler warnings.
874
875 3. The pcretest program used to cheat by referring to symbols in the library
876 whose names begin with _pcre_. These are internal symbols that are not
877 really supposed to be visible externally, and in some environments it is
878 possible to suppress them. The cheating is now confined to including
879 certain files from the library's source, which is a bit cleaner.
880
881 4. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
882 file's purpose clearer.
883
884 5. Reorganized pcre_ucp_findchar().
885
886
887 Version 6.3 15-Aug-05
888 ---------------------
889
890 1. The file libpcre.pc.in did not have general read permission in the tarball.
891
892 2. There were some problems when building without C++ support:
893
894 (a) If C++ support was not built, "make install" and "make test" still
895 tried to test it.
896
897 (b) There were problems when the value of CXX was explicitly set. Some
898 changes have been made to try to fix these, and ...
899
900 (c) --disable-cpp can now be used to explicitly disable C++ support.
901
902 (d) The use of @CPP_OBJ@ directly caused a blank line preceded by a
903 backslash in a target when C++ was disabled. This confuses some
904 versions of "make", apparently. Using an intermediate variable solves
905 this. (Same for CPP_LOBJ.)
906
907 3. $(LINK_FOR_BUILD) now includes $(CFLAGS_FOR_BUILD) and $(LINK)
908 (non-Windows) now includes $(CFLAGS) because these flags are sometimes
909 necessary on certain architectures.
910
911 4. Added a setting of -export-symbols-regex to the link command to remove
912 those symbols that are exported in the C sense, but actually are local
913 within the library, and not documented. Their names all begin with
914 "_pcre_". This is not a perfect job, because (a) we have to except some
915 symbols that pcretest ("illegally") uses, and (b) the facility isn't always
916 available (and never for static libraries). I have made a note to try to
917 find a way round (a) in the future.
918
919
920 Version 6.2 01-Aug-05
921 ---------------------
922
923 1. There was no test for integer overflow of quantifier values. A construction
924 such as {1111111111111111} would give undefined results. What is worse, if
925 a minimum quantifier for a parenthesized subpattern overflowed and became
926 negative, the calculation of the memory size went wrong. This could have
927 led to memory overwriting.
928
929 2. Building PCRE using VPATH was broken. Hopefully it is now fixed.
930
931 3. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
932 operating environments where this matters.
933
934 4. Applied Giuseppe Maxia's patch to add additional features for controlling
935 PCRE options from within the C++ wrapper.
936
937 5. Named capturing subpatterns were not being correctly counted when a pattern
938 was compiled. This caused two problems: (a) If there were more than 100
939 such subpatterns, the calculation of the memory needed for the whole
940 compiled pattern went wrong, leading to an overflow error. (b) Numerical
941 back references of the form \12, where the number was greater than 9, were
942 not recognized as back references, even though there were sufficient
943 previous subpatterns.
944
945 6. Two minor patches to pcrecpp.cc in order to allow it to compile on older
946 versions of gcc, e.g. 2.95.4.
947
948
949 Version 6.1 21-Jun-05
950 ---------------------
951
952 1. There was one reference to the variable "posix" in pcretest.c that was not
953 surrounded by "#if !defined NOPOSIX".
954
955 2. Make it possible to compile pcretest without DFA support, UTF8 support, or
956 the cross-check on the old pcre_info() function, for the benefit of the
957 cut-down version of PCRE that is currently imported into Exim.
958
959 3. A (silly) pattern starting with (?i)(?-i) caused an internal space
960 allocation error. I've done the easy fix, which wastes 2 bytes for sensible
961 patterns that start (?i) but I don't think that matters. The use of (?i) is
962 just an example; this all applies to the other options as well.
963
964 4. Since libtool seems to echo the compile commands it is issuing, the output
965 from "make" can be reduced a bit by putting "@" in front of each libtool
966 compile command.
967
968 5. Patch from the folks at Google for configure.in to be a bit more thorough
969 in checking for a suitable C++ installation before trying to compile the
970 C++ stuff. This should fix a reported problem when a compiler was present,
971 but no suitable headers.
972
973 6. The man pages all had just "PCRE" as their title. I have changed them to
974 be the relevant file name. I have also arranged that these names are
975 retained in the file doc/pcre.txt, which is a concatenation in text format
976 of all the man pages except the little individual ones for each function.
977
978 7. The NON-UNIX-USE file had not been updated for the different set of source
979 files that come with release 6. I also added a few comments about the C++
980 wrapper.
981
982
983 Version 6.0 07-Jun-05
984 ---------------------
985
986 1. Some minor internal re-organization to help with my DFA experiments.
987
988 2. Some missing #ifdef SUPPORT_UCP conditionals in pcretest and printint that
989 didn't matter for the library itself when fully configured, but did matter
990 when compiling without UCP support, or within Exim, where the ucp files are
991 not imported.
992
993 3. Refactoring of the library code to split up the various functions into
994 different source modules. The addition of the new DFA matching code (see
995 below) to a single monolithic source would have made it really too
996 unwieldy, quite apart from causing all the code to be include in a
997 statically linked application, when only some functions are used. This is
998 relevant even without the DFA addition now that patterns can be compiled in
999 one application and matched in another.
1000
1001 The downside of splitting up is that there have to be some external
1002 functions and data tables that are used internally in different modules of
1003 the library but which are not part of the API. These have all had their
1004 names changed to start with "_pcre_" so that they are unlikely to clash
1005 with other external names.
1006
1007 4. Added an alternate matching function, pcre_dfa_exec(), which matches using
1008 a different (DFA) algorithm. Although it is slower than the original
1009 function, it does have some advantages for certain types of matching
1010 problem.
1011
1012 5. Upgrades to pcretest in order to test the features of pcre_dfa_exec(),
1013 including restarting after a partial match.
1014
1015 6. A patch for pcregrep that defines INVALID_FILE_ATTRIBUTES if it is not
1016 defined when compiling for Windows was sent to me. I have put it into the
1017 code, though I have no means of testing or verifying it.
1018
1019 7. Added the pcre_refcount() auxiliary function.
1020
1021 8. Added the PCRE_FIRSTLINE option. This constrains an unanchored pattern to
1022 match before or at the first newline in the subject string. In pcretest,
1023 the /f option on a pattern can be used to set this.
1024
1025 9. A repeated \w when used in UTF-8 mode with characters greater than 256
1026 would behave wrongly. This has been present in PCRE since release 4.0.
1027
1028 10. A number of changes to the pcregrep command:
1029
1030 (a) Refactored how -x works; insert ^(...)$ instead of setting
1031 PCRE_ANCHORED and checking the length, in preparation for adding
1032 something similar for -w.
1033
1034 (b) Added the -w (match as a word) option.
1035
1036 (c) Refactored the way lines are read and buffered so as to have more
1037 than one at a time available.
1038
1039 (d) Implemented a pcregrep test script.
1040
1041 (e) Added the -M (multiline match) option. This allows patterns to match
1042 over several lines of the subject. The buffering ensures that at least
1043 8K, or the rest of the document (whichever is the shorter) is available
1044 for matching (and similarly the previous 8K for lookbehind assertions).
1045
1046 (f) Changed the --help output so that it now says
1047
1048 -w, --word-regex(p)
1049
1050 instead of two lines, one with "regex" and the other with "regexp"
1051 because that confused at least one person since the short forms are the
1052 same. (This required a bit of code, as the output is generated
1053 automatically from a table. It wasn't just a text change.)
1054
1055 (g) -- can be used to terminate pcregrep options if the next thing isn't an
1056 option but starts with a hyphen. Could be a pattern or a path name
1057 starting with a hyphen, for instance.
1058
1059 (h) "-" can be given as a file name to represent stdin.
1060
1061 (i) When file names are being printed, "(standard input)" is used for
1062 the standard input, for compatibility with GNU grep. Previously
1063 "<stdin>" was used.
1064
1065 (j) The option --label=xxx can be used to supply a name to be used for
1066 stdin when file names are being printed. There is no short form.
1067
1068 (k) Re-factored the options decoding logic because we are going to add
1069 two more options that take data. Such options can now be given in four
1070 different ways, e.g. "-fname", "-f name", "--file=name", "--file name".
1071
1072 (l) Added the -A, -B, and -C options for requesting that lines of context
1073 around matches be printed.
1074
1075 (m) Added the -L option to print the names of files that do not contain
1076 any matching lines, that is, the complement of -l.
1077
1078 (n) The return code is 2 if any file cannot be opened, but pcregrep does
1079 continue to scan other files.
1080
1081 (o) The -s option was incorrectly implemented. For compatibility with other
1082 greps, it now suppresses the error message for a non-existent or non-
1083 accessible file (but not the return code). There is a new option called
1084 -q that suppresses the output of matching lines, which was what -s was
1085 previously doing.
1086
1087 (p) Added --include and --exclude options to specify files for inclusion
1088 and exclusion when recursing.
1089
1090 11. The Makefile was not using the Autoconf-supported LDFLAGS macro properly.
1091 Hopefully, it now does.
1092
1093 12. Missing cast in pcre_study().
1094
1095 13. Added an "uninstall" target to the makefile.
1096
1097 14. Replaced "extern" in the function prototypes in Makefile.in with
1098 "PCRE_DATA_SCOPE", which defaults to 'extern' or 'extern "C"' in the Unix
1099 world, but is set differently for Windows.
1100
1101 15. Added a second compiling function called pcre_compile2(). The only
1102 difference is that it has an extra argument, which is a pointer to an
1103 integer error code. When there is a compile-time failure, this is set
1104 non-zero, in addition to the error test pointer being set to point to an
1105 error message. The new argument may be NULL if no error number is required
1106 (but then you may as well call pcre_compile(), which is now just a
1107 wrapper). This facility is provided because some applications need a
1108 numeric error indication, but it has also enabled me to tidy up the way
1109 compile-time errors are handled in the POSIX wrapper.
1110
1111 16. Added VPATH=.libs to the makefile; this should help when building with one
1112 prefix path and installing with another. (Or so I'm told by someone who
1113 knows more about this stuff than I do.)
1114
1115 17. Added a new option, REG_DOTALL, to the POSIX function regcomp(). This
1116 passes PCRE_DOTALL to the pcre_compile() function, making the "." character
1117 match everything, including newlines. This is not POSIX-compatible, but
1118 somebody wanted the feature. From pcretest it can be activated by using
1119 both the P and the s flags.
1120
1121 18. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one.
1122
1123 19. libpcre.pc was being incorrectly installed as executable.
1124
1125 20. A couple of places in pcretest check for end-of-line by looking for '\n';
1126 it now also looks for '\r' so that it will work unmodified on Windows.
1127
1128 21. Added Google's contributed C++ wrapper to the distribution.
1129
1130 22. Added some untidy missing memory free() calls in pcretest, to keep
1131 Electric Fence happy when testing.
1132
1133
1134
1135 Version 5.0 13-Sep-04
1136 ---------------------
1137
1138 1. Internal change: literal characters are no longer packed up into items
1139 containing multiple characters in a single byte-string. Each character
1140 is now matched using a separate opcode. However, there may be more than one
1141 byte in the character in UTF-8 mode.
1142
1143 2. The pcre_callout_block structure has two new fields: pattern_position and
1144 next_item_length. These contain the offset in the pattern to the next match
1145 item, and its length, respectively.
1146
1147 3. The PCRE_AUTO_CALLOUT option for pcre_compile() requests the automatic
1148 insertion of callouts before each pattern item. Added the /C option to
1149 pcretest to make use of this.
1150
1151 4. On the advice of a Windows user, the lines
1152
1153 #if defined(_WIN32) || defined(WIN32)
1154 _setmode( _fileno( stdout ), 0x8000 );
1155 #endif /* defined(_WIN32) || defined(WIN32) */
1156
1157 have been added to the source of pcretest. This apparently does useful
1158 magic in relation to line terminators.
1159
1160 5. Changed "r" and "w" in the calls to fopen() in pcretest to "rb" and "wb"
1161 for the benefit of those environments where the "b" makes a difference.
1162
1163 6. The icc compiler has the same options as gcc, but "configure" doesn't seem
1164 to know about it. I have put a hack into configure.in that adds in code
1165 to set GCC=yes if CC=icc. This seems to end up at a point in the
1166 generated configure script that is early enough to affect the setting of
1167 compiler options, which is what is needed, but I have no means of testing
1168 whether it really works. (The user who reported this had patched the
1169 generated configure script, which of course I cannot do.)
1170
1171 LATER: After change 22 below (new libtool files), the configure script
1172 seems to know about icc (and also ecc). Therefore, I have commented out
1173 this hack in configure.in.
1174
1175 7. Added support for pkg-config (2 patches were sent in).
1176
1177 8. Negated POSIX character classes that used a combination of internal tables
1178 were completely broken. These were [[:^alpha:]], [[:^alnum:]], and
1179 [[:^ascii]]. Typically, they would match almost any characters. The other
1180 POSIX classes were not broken in this way.
1181
1182 9. Matching the pattern "\b.*?" against "ab cd", starting at offset 1, failed
1183 to find the match, as PCRE was deluded into thinking that the match had to
1184 start at the start point or following a newline. The same bug applied to
1185 patterns with negative forward assertions or any backward assertions
1186 preceding ".*" at the start, unless the pattern required a fixed first
1187 character. This was a failing pattern: "(?!.bcd).*". The bug is now fixed.
1188
1189 10. In UTF-8 mode, when moving forwards in the subject after a failed match
1190 starting at the last subject character, bytes beyond the end of the subject
1191 string were read.
1192
1193 11. Renamed the variable "class" as "classbits" to make life easier for C++
1194 users. (Previously there was a macro definition, but it apparently wasn't
1195 enough.)
1196
1197 12. Added the new field "tables" to the extra data so that tables can be passed
1198 in at exec time, or the internal tables can be re-selected. This allows
1199 a compiled regex to be saved and re-used at a later time by a different
1200 program that might have everything at different addresses.
1201
1202 13. Modified the pcre-config script so that, when run on Solaris, it shows a
1203 -R library as well as a -L library.
1204
1205 14. The debugging options of pcretest (-d on the command line or D on a
1206 pattern) showed incorrect output for anything following an extended class
1207 that contained multibyte characters and which was followed by a quantifier.
1208
1209 15. Added optional support for general category Unicode character properties
1210 via the \p, \P, and \X escapes. Unicode property support implies UTF-8
1211 support. It adds about 90K to the size of the library. The meanings of the
1212 inbuilt class escapes such as \d and \s have NOT been changed.
1213
1214 16. Updated pcredemo.c to include calls to free() to release the memory for the
1215 compiled pattern.
1216
1217 17. The generated file chartables.c was being created in the source directory
1218 instead of in the building directory. This caused the build to fail if the
1219 source directory was different from the building directory, and was
1220 read-only.
1221
1222 18. Added some sample Win commands from Mark Tetrode into the NON-UNIX-USE
1223 file. No doubt somebody will tell me if they don't make sense... Also added
1224 Dan Mooney's comments about building on OpenVMS.
1225
1226 19. Added support for partial matching via the PCRE_PARTIAL option for
1227 pcre_exec() and the \P data escape in pcretest.
1228
1229 20. Extended pcretest with 3 new pattern features:
1230
1231 (i) A pattern option of the form ">rest-of-line" causes pcretest to
1232 write the compiled pattern to the file whose name is "rest-of-line".
1233 This is a straight binary dump of the data, with the saved pointer to
1234 the character tables forced to be NULL. The study data, if any, is
1235 written too. After writing, pcretest reads a new pattern.
1236
1237 (ii) If, instead of a pattern, "<rest-of-line" is given, pcretest reads a
1238 compiled pattern from the given file. There must not be any
1239 occurrences of "<" in the file name (pretty unlikely); if there are,
1240 pcretest will instead treat the initial "<" as a pattern delimiter.
1241 After reading in the pattern, pcretest goes on to read data lines as
1242 usual.
1243
1244 (iii) The F pattern option causes pcretest to flip the bytes in the 32-bit
1245 and 16-bit fields in a compiled pattern, to simulate a pattern that
1246 was compiled on a host of opposite endianness.
1247
1248 21. The pcre-exec() function can now cope with patterns that were compiled on
1249 hosts of opposite endianness, with this restriction:
1250
1251 As for any compiled expression that is saved and used later, the tables
1252 pointer field cannot be preserved; the extra_data field in the arguments
1253 to pcre_exec() should be used to pass in a tables address if a value
1254 other than the default internal tables were used at compile time.
1255
1256 22. Calling pcre_exec() with a negative value of the "ovecsize" parameter is
1257 now diagnosed as an error. Previously, most of the time, a negative number
1258 would have been treated as zero, but if in addition "ovector" was passed as
1259 NULL, a crash could occur.
1260
1261 23. Updated the files ltmain.sh, config.sub, config.guess, and aclocal.m4 with
1262 new versions from the libtool 1.5 distribution (the last one is a copy of
1263 a file called libtool.m4). This seems to have fixed the need to patch
1264 "configure" to support Darwin 1.3 (which I used to do). However, I still
1265 had to patch ltmain.sh to ensure that ${SED} is set (it isn't on my
1266 workstation).
1267
1268 24. Changed the PCRE licence to be the more standard "BSD" licence.
1269
1270
1271 Version 4.5 01-Dec-03
1272 ---------------------
1273
1274 1. There has been some re-arrangement of the code for the match() function so
1275 that it can be compiled in a version that does not call itself recursively.
1276 Instead, it keeps those local variables that need separate instances for
1277 each "recursion" in a frame on the heap, and gets/frees frames whenever it
1278 needs to "recurse". Keeping track of where control must go is done by means
1279 of setjmp/longjmp. The whole thing is implemented by a set of macros that
1280 hide most of the details from the main code, and operates only if
1281 NO_RECURSE is defined while compiling pcre.c. If PCRE is built using the
1282 "configure" mechanism, "--disable-stack-for-recursion" turns on this way of
1283 operating.
1284
1285 To make it easier for callers to provide specially tailored get/free
1286 functions for this usage, two new functions, pcre_stack_malloc, and
1287 pcre_stack_free, are used. They are always called in strict stacking order,
1288 and the size of block requested is always the same.
1289
1290 The PCRE_CONFIG_STACKRECURSE info parameter can be used to find out whether
1291 PCRE has been compiled to use the stack or the heap for recursion. The
1292 -C option of pcretest uses this to show which version is compiled.
1293
1294 A new data escape \S, is added to pcretest; it causes the amounts of store
1295 obtained and freed by both kinds of malloc/free at match time to be added
1296 to the output.
1297
1298 2. Changed the locale test to use "fr_FR" instead of "fr" because that's
1299 what's available on my current Linux desktop machine.
1300
1301 3. When matching a UTF-8 string, the test for a valid string at the start has
1302 been extended. If start_offset is not zero, PCRE now checks that it points
1303 to a byte that is the start of a UTF-8 character. If not, it returns
1304 PCRE_ERROR_BADUTF8_OFFSET (-11). Note: the whole string is still checked;
1305 this is necessary because there may be backward assertions in the pattern.
1306 When matching the same subject several times, it may save resources to use
1307 PCRE_NO_UTF8_CHECK on all but the first call if the string is long.
1308
1309 4. The code for checking the validity of UTF-8 strings has been tightened so
1310 that it rejects (a) strings containing 0xfe or 0xff bytes and (b) strings
1311 containing "overlong sequences".
1312
1313 5. Fixed a bug (appearing twice) that I could not find any way of exploiting!
1314 I had written "if ((digitab[*p++] && chtab_digit) == 0)" where the "&&"
1315 should have been "&", but it just so happened that all the cases this let
1316 through by mistake were picked up later in the function.
1317
1318 6. I had used a variable called "isblank" - this is a C99 function, causing
1319 some compilers to warn. To avoid this, I renamed it (as "blankclass").
1320
1321 7. Cosmetic: (a) only output another newline at the end of pcretest if it is
1322 prompting; (b) run "./pcretest /dev/null" at the start of the test script
1323 so the version is shown; (c) stop "make test" echoing "./RunTest".
1324
1325 8. Added patches from David Burgess to enable PCRE to run on EBCDIC systems.
1326
1327 9. The prototype for memmove() for systems that don't have it was using
1328 size_t, but the inclusion of the header that defines size_t was later. I've
1329 moved the #includes for the C headers earlier to avoid this.
1330
1331 10. Added some adjustments to the code to make it easier to compiler on certain
1332 special systems:
1333
1334 (a) Some "const" qualifiers were missing.
1335 (b) Added the macro EXPORT before all exported functions; by default this
1336 is defined to be empty.
1337 (c) Changed the dftables auxiliary program (that builds chartables.c) so
1338 that it reads its output file name as an argument instead of writing
1339 to the standard output and assuming this can be redirected.
1340
1341 11. In UTF-8 mode, if a recursive reference (e.g. (?1)) followed a character
1342 class containing characters with values greater than 255, PCRE compilation
1343 went into a loop.
1344
1345 12. A recursive reference to a subpattern that was within another subpattern
1346 that had a minimum quantifier of zero caused PCRE to crash. For example,
1347 (x(y(?2))z)? provoked this bug with a subject that got as far as the
1348 recursion. If the recursively-called subpattern itself had a zero repeat,
1349 that was OK.
1350
1351 13. In pcretest, the buffer for reading a data line was set at 30K, but the
1352 buffer into which it was copied (for escape processing) was still set at
1353 1024, so long lines caused crashes.
1354
1355 14. A pattern such as /[ab]{1,3}+/ failed to compile, giving the error
1356 "internal error: code overflow...". This applied to any character class
1357 that was followed by a possessive quantifier.
1358
1359 15. Modified the Makefile to add libpcre.la as a prerequisite for
1360 libpcreposix.la because I was told this is needed for a parallel build to
1361 work.
1362
1363 16. If a pattern that contained .* following optional items at the start was
1364 studied, the wrong optimizing data was generated, leading to matching
1365 errors. For example, studying /[ab]*.*c/ concluded, erroneously, that any
1366 matching string must start with a or b or c. The correct conclusion for
1367 this pattern is that a match can start with any character.
1368
1369
1370 Version 4.4 13-Aug-03
1371 ---------------------
1372
1373 1. In UTF-8 mode, a character class containing characters with values between
1374 127 and 255 was not handled correctly if the compiled pattern was studied.
1375 In fixing this, I have also improved the studying algorithm for such
1376 classes (slightly).
1377
1378 2. Three internal functions had redundant arguments passed to them. Removal
1379 might give a very teeny performance improvement.
1380
1381 3. Documentation bug: the value of the capture_top field in a callout is *one
1382 more than* the number of the hightest numbered captured substring.
1383
1384 4. The Makefile linked pcretest and pcregrep with -lpcre, which could result
1385 in incorrectly linking with a previously installed version. They now link
1386 explicitly with libpcre.la.
1387
1388 5. configure.in no longer needs to recognize Cygwin specially.
1389
1390 6. A problem in pcre.in for Windows platforms is fixed.
1391
1392 7. If a pattern was successfully studied, and the -d (or /D) flag was given to
1393 pcretest, it used to include the size of the study block as part of its
1394 output. Unfortunately, the structure contains a field that has a different
1395 size on different hardware architectures. This meant that the tests that
1396 showed this size failed. As the block is currently always of a fixed size,
1397 this information isn't actually particularly useful in pcretest output, so
1398 I have just removed it.
1399
1400 8. Three pre-processor statements accidentally did not start in column 1.
1401 Sadly, there are *still* compilers around that complain, even though
1402 standard C has not required this for well over a decade. Sigh.
1403
1404 9. In pcretest, the code for checking callouts passed small integers in the
1405 callout_data field, which is a void * field. However, some picky compilers
1406 complained about the casts involved for this on 64-bit systems. Now
1407 pcretest passes the address of the small integer instead, which should get
1408 rid of the warnings.
1409
1410 10. By default, when in UTF-8 mode, PCRE now checks for valid UTF-8 strings at
1411 both compile and run time, and gives an error if an invalid UTF-8 sequence
1412 is found. There is a option for disabling this check in cases where the
1413 string is known to be correct and/or the maximum performance is wanted.
1414
1415 11. In response to a bug report, I changed one line in Makefile.in from
1416
1417 -Wl,--out-implib,.libs/lib@WIN_PREFIX@pcreposix.dll.a \
1418 to
1419 -Wl,--out-implib,.libs/@WIN_PREFIX@libpcreposix.dll.a \
1420
1421 to look similar to other lines, but I have no way of telling whether this
1422 is the right thing to do, as I do not use Windows. No doubt I'll get told
1423 if it's wrong...
1424
1425
1426 Version 4.3 21-May-03
1427 ---------------------
1428
1429 1. Two instances of @WIN_PREFIX@ omitted from the Windows targets in the
1430 Makefile.
1431
1432 2. Some refactoring to improve the quality of the code:
1433
1434 (i) The utf8_table... variables are now declared "const".
1435
1436 (ii) The code for \cx, which used the "case flipping" table to upper case
1437 lower case letters, now just substracts 32. This is ASCII-specific,
1438 but the whole concept of \cx is ASCII-specific, so it seems
1439 reasonable.
1440
1441 (iii) PCRE was using its character types table to recognize decimal and
1442 hexadecimal digits in the pattern. This is silly, because it handles
1443 only 0-9, a-f, and A-F, but the character types table is locale-
1444 specific, which means strange things might happen. A private
1445 table is now used for this - though it costs 256 bytes, a table is
1446 much faster than multiple explicit tests. Of course, the standard
1447 character types table is still used for matching digits in subject
1448 strings against \d.
1449
1450 (iv) Strictly, the identifier ESC_t is reserved by POSIX (all identifiers
1451 ending in _t are). So I've renamed it as ESC_tee.
1452
1453 3. The first argument for regexec() in the POSIX wrapper should have been
1454 defined as "const".
1455
1456 4. Changed pcretest to use malloc() for its buffers so that they can be
1457 Electric Fenced for debugging.
1458
1459 5. There were several places in the code where, in UTF-8 mode, PCRE would try
1460 to read one or more bytes before the start of the subject string. Often this
1461 had no effect on PCRE's behaviour, but in some circumstances it could
1462 provoke a segmentation fault.
1463
1464 6. A lookbehind at the start of a pattern in UTF-8 mode could also cause PCRE
1465 to try to read one or more bytes before the start of the subject string.
1466
1467 7. A lookbehind in a pattern matched in non-UTF-8 mode on a PCRE compiled with
1468 UTF-8 support could misbehave in various ways if the subject string
1469 contained bytes with the 0x80 bit set and the 0x40 bit unset in a lookbehind
1470 area. (PCRE was not checking for the UTF-8 mode flag, and trying to move
1471 back over UTF-8 characters.)
1472
1473
1474 Version 4.2 14-Apr-03
1475 ---------------------
1476
1477 1. Typo "#if SUPPORT_UTF8" instead of "#ifdef SUPPORT_UTF8" fixed.
1478
1479 2. Changes to the building process, supplied by Ronald Landheer-Cieslak
1480 [ON_WINDOWS]: new variable, "#" on non-Windows platforms
1481 [NOT_ON_WINDOWS]: new variable, "#" on Windows platforms
1482 [WIN_PREFIX]: new variable, "cyg" for Cygwin
1483 * Makefile.in: use autoconf substitution for OBJEXT, EXEEXT, BUILD_OBJEXT
1484 and BUILD_EXEEXT
1485 Note: automatic setting of the BUILD variables is not yet working
1486 set CPPFLAGS and BUILD_CPPFLAGS (but don't use yet) - should be used at
1487 compile-time but not at link-time
1488 [LINK]: use for linking executables only
1489 make different versions for Windows and non-Windows
1490 [LINKLIB]: new variable, copy of UNIX-style LINK, used for linking
1491 libraries
1492 [LINK_FOR_BUILD]: new variable
1493 [OBJEXT]: use throughout
1494 [EXEEXT]: use throughout
1495 <winshared>: new target
1496 <wininstall>: new target
1497 <dftables.o>: use native compiler
1498 <dftables>: use native linker
1499 <install>: handle Windows platform correctly
1500 <clean>: ditto
1501 <check>: ditto
1502 copy DLL to top builddir before testing
1503
1504 As part of these changes, -no-undefined was removed again. This was reported
1505 to give trouble on HP-UX 11.0, so getting rid of it seems like a good idea
1506 in any case.
1507
1508 3. Some tidies to get rid of compiler warnings:
1509
1510 . In the match_data structure, match_limit was an unsigned long int, whereas
1511 match_call_count was an int. I've made them both unsigned long ints.
1512
1513 . In pcretest the fact that a const uschar * doesn't automatically cast to
1514 a void * provoked a warning.
1515
1516 . Turning on some more compiler warnings threw up some "shadow" variables
1517 and a few more missing casts.
1518
1519 4. If PCRE was complied with UTF-8 support, but called without the PCRE_UTF8
1520 option, a class that contained a single character with a value between 128
1521 and 255 (e.g. /[\xFF]/) caused PCRE to crash.
1522
1523 5. If PCRE was compiled with UTF-8 support, but called without the PCRE_UTF8
1524 option, a class that contained several characters, but with at least one
1525 whose value was between 128 and 255 caused PCRE to crash.
1526
1527
1528 Version 4.1 12-Mar-03
1529 ---------------------
1530
1531 1. Compiling with gcc -pedantic found a couple of places where casts were
1532 needed, and a string in dftables.c that was longer than standard compilers are
1533 required to support.
1534
1535 2. Compiling with Sun's compiler found a few more places where the code could
1536 be tidied up in order to avoid warnings.
1537
1538 3. The variables for cross-compiling were called HOST_CC and HOST_CFLAGS; the
1539 first of these names is deprecated in the latest Autoconf in favour of the name
1540 CC_FOR_BUILD, because "host" is typically used to mean the system on which the
1541 compiled code will be run. I can't find a reference for HOST_CFLAGS, but by
1542 analogy I have changed it to CFLAGS_FOR_BUILD.
1543
1544 4. Added -no-undefined to the linking command in the Makefile, because this is
1545 apparently helpful for Windows. To make it work, also added "-L. -lpcre" to the
1546 linking step for the pcreposix library.
1547
1548 5. PCRE was failing to diagnose the case of two named groups with the same
1549 name.
1550
1551 6. A problem with one of PCRE's optimizations was discovered. PCRE remembers a
1552 literal character that is needed in the subject for a match, and scans along to
1553 ensure that it is present before embarking on the full matching process. This
1554 saves time in cases of nested unlimited repeats that are never going to match.
1555 Problem: the scan can take a lot of time if the subject is very long (e.g.
1556 megabytes), thus penalizing straightforward matches. It is now done only if the
1557 amount of subject to be scanned is less than 1000 bytes.
1558
1559 7. A lesser problem with the same optimization is that it was recording the
1560 first character of an anchored pattern as "needed", thus provoking a search
1561 right along the subject, even when the first match of the pattern was going to
1562 fail. The "needed" character is now not set for anchored patterns, unless it
1563 follows something in the pattern that is of non-fixed length. Thus, it still
1564 fulfils its original purpose of finding quick non-matches in cases of nested
1565 unlimited repeats, but isn't used for simple anchored patterns such as /^abc/.
1566
1567
1568 Version 4.0 17-Feb-03
1569 ---------------------
1570
1571 1. If a comment in an extended regex that started immediately after a meta-item
1572 extended to the end of string, PCRE compiled incorrect data. This could lead to
1573 all kinds of weird effects. Example: /#/ was bad; /()#/ was bad; /a#/ was not.
1574
1575 2. Moved to autoconf 2.53 and libtool 1.4.2.
1576
1577 3. Perl 5.8 no longer needs "use utf8" for doing UTF-8 things. Consequently,
1578 the special perltest8 script is no longer needed - all the tests can be run
1579 from a single perltest script.
1580
1581 4. From 5.004, Perl has not included the VT character (0x0b) in the set defined
1582 by \s. It has now been removed in PCRE. This means it isn't recognized as
1583 whitespace in /x regexes too, which is the same as Perl. Note that the POSIX
1584 class [:space:] *does* include VT, thereby creating a mess.
1585
1586 5. Added the class [:blank:] (a GNU extension from Perl 5.8) to match only
1587 space and tab.
1588
1589 6. Perl 5.005 was a long time ago. It's time to amalgamate the tests that use
1590 its new features into the main test script, reducing the number of scripts.
1591
1592 7. Perl 5.8 has changed the meaning of patterns like /a(?i)b/. Earlier versions
1593 were backward compatible, and made the (?i) apply to the whole pattern, as if
1594 /i were given. Now it behaves more logically, and applies the option setting
1595 only to what follows. PCRE has been changed to follow suit. However, if it
1596 finds options settings right at the start of the pattern, it extracts them into
1597 the global options, as before. Thus, they show up in the info data.
1598
1599 8. Added support for the \Q...\E escape sequence. Characters in between are
1600 treated as literals. This is slightly different from Perl in that $ and @ are
1601 also handled as literals inside the quotes. In Perl, they will cause variable
1602 interpolation. Note the following examples:
1603
1604 Pattern PCRE matches Perl matches
1605
1606 \Qabc$xyz\E abc$xyz abc followed by the contents of $xyz
1607 \Qabc\$xyz\E abc\$xyz abc\$xyz
1608 \Qabc\E\$\Qxyz\E abc$xyz abc$xyz
1609
1610 For compatibility with Perl, \Q...\E sequences are recognized inside character
1611 classes as well as outside them.
1612
1613 9. Re-organized 3 code statements in pcretest to avoid "overflow in
1614 floating-point constant arithmetic" warnings from a Microsoft compiler. Added a
1615 (size_t) cast to one statement in pcretest and one in pcreposix to avoid
1616 signed/unsigned warnings.
1617
1618 10. SunOS4 doesn't have strtoul(). This was used only for unpicking the -o
1619 option for pcretest, so I've replaced it by a simple function that does just
1620 that job.
1621
1622 11. pcregrep was ending with code 0 instead of 2 for the commands "pcregrep" or
1623 "pcregrep -".
1624
1625 12. Added "possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's
1626 Java package. This provides some syntactic sugar for simple cases of what my
1627 documentation calls "once-only subpatterns". A pattern such as x*+ is the same
1628 as (?>x*). In other words, if what is inside (?>...) is just a single repeated
1629 item, you can use this simplified notation. Note that only makes sense with
1630 greedy quantifiers. Consequently, the use of the possessive quantifier forces
1631 greediness, whatever the setting of the PCRE_UNGREEDY option.
1632
1633 13. A change of greediness default within a pattern was not taking effect at
1634 the current level for patterns like /(b+(?U)a+)/. It did apply to parenthesized
1635 subpatterns that followed. Patterns like /b+(?U)a+/ worked because the option
1636 was abstracted outside.
1637
1638 14. PCRE now supports the \G assertion. It is true when the current matching
1639 position is at the start point of the match. This differs from \A when the
1640 starting offset is non-zero. Used with the /g option of pcretest (or similar
1641 code), it works in the same way as it does for Perl's /g option. If all
1642 alternatives of a regex begin with \G, the expression is anchored to the start
1643 match position, and the "anchored" flag is set in the compiled expression.
1644
1645 15. Some bugs concerning the handling of certain option changes within patterns
1646 have been fixed. These applied to options other than (?ims). For example,
1647 "a(?x: b c )d" did not match "XabcdY" but did match "Xa b c dY". It should have
1648 been the other way round. Some of this was related to change 7 above.
1649
1650 16. PCRE now gives errors for /[.x.]/ and /[=x=]/ as unsupported POSIX
1651 features, as Perl does. Previously, PCRE gave the warnings only for /[[.x.]]/
1652 and /[[=x=]]/. PCRE now also gives an error for /[:name:]/ because it supports
1653 POSIX classes only within a class (e.g. /[[:alpha:]]/).
1654
1655 17. Added support for Perl's \C escape. This matches one byte, even in UTF8
1656 mode. Unlike ".", it always matches newline, whatever the setting of
1657 PCRE_DOTALL. However, PCRE does not permit \C to appear in lookbehind
1658 assertions. Perl allows it, but it doesn't (in general) work because it can't
1659 calculate the length of the lookbehind. At least, that's the case for Perl
1660 5.8.0 - I've been told they are going to document that it doesn't work in
1661 future.
1662
1663 18. Added an error diagnosis for escapes that PCRE does not support: these are
1664 \L, \l, \N, \P, \p, \U, \u, and \X.
1665
1666 19. Although correctly diagnosing a missing ']' in a character class, PCRE was
1667 reading past the end of the pattern in cases such as /[abcd/.
1668
1669 20. PCRE was getting more memory than necessary for patterns with classes that
1670 contained both POSIX named classes and other characters, e.g. /[[:space:]abc/.
1671
1672 21. Added some code, conditional on #ifdef VPCOMPAT, to make life easier for
1673 compiling PCRE for use with Virtual Pascal.
1674
1675 22. Small fix to the Makefile to make it work properly if the build is done
1676 outside the source tree.
1677
1678 23. Added a new extension: a condition to go with recursion. If a conditional
1679 subpattern starts with (?(R) the "true" branch is used if recursion has
1680 happened, whereas the "false" branch is used only at the top level.
1681
1682 24. When there was a very long string of literal characters (over 255 bytes
1683 without UTF support, over 250 bytes with UTF support), the computation of how
1684 much memory was required could be incorrect, leading to segfaults or other
1685 strange effects.
1686
1687 25. PCRE was incorrectly assuming anchoring (either to start of subject or to
1688 start of line for a non-DOTALL pattern) when a pattern started with (.*) and
1689 there was a subsequent back reference to those brackets. This meant that, for
1690 example, /(.*)\d+\1/ failed to match "abc123bc". Unfortunately, it isn't
1691 possible to check for precisely this case. All we can do is abandon the
1692 optimization if .* occurs inside capturing brackets when there are any back
1693 references whatsoever. (See below for a better fix that came later.)
1694
1695 26. The handling of the optimization for finding the first character of a
1696 non-anchored pattern, and for finding a character that is required later in the
1697 match were failing in some cases. This didn't break the matching; it just
1698 failed to optimize when it could. The way this is done has been re-implemented.
1699
1700 27. Fixed typo in error message for invalid (?R item (it said "(?p").
1701
1702 28. Added a new feature that provides some of the functionality that Perl
1703 provides with (?{...}). The facility is termed a "callout". The way it is done
1704 in PCRE is for the caller to provide an optional function, by setting
1705 pcre_callout to its entry point. Like pcre_malloc and pcre_free, this is a
1706 global variable. By default it is unset, which disables all calling out. To get
1707 the function called, the regex must include (?C) at appropriate points. This
1708 is, in fact, equivalent to (?C0), and any number <= 255 may be given with (?C).
1709 This provides a means of identifying different callout points. When PCRE
1710 reaches such a point in the regex, if pcre_callout has been set, the external
1711 function is called. It is provided with data in a structure called
1712 pcre_callout_block, which is defined in pcre.h. If the function returns 0,
1713 matching continues; if it returns a non-zero value, the match at the current
1714 point fails. However, backtracking will occur if possible. [This was changed
1715 later and other features added - see item 49 below.]
1716
1717 29. pcretest is upgraded to test the callout functionality. It provides a
1718 callout function that displays information. By default, it shows the start of
1719 the match and the current position in the text. There are some new data escapes
1720 to vary what happens:
1721
1722 \C+ in addition, show current contents of captured substrings
1723 \C- do not supply a callout function
1724 \C!n return 1 when callout number n is reached
1725 \C!n!m return 1 when callout number n is reached for the mth time
1726
1727 30. If pcregrep was called with the -l option and just a single file name, it
1728 output "<stdin>" if a match was found, instead of the file name.
1729
1730 31. Improve the efficiency of the POSIX API to PCRE. If the number of capturing
1731 slots is less than POSIX_MALLOC_THRESHOLD, use a block on the stack to pass to
1732 pcre_exec(). This saves a malloc/free per call. The default value of
1733 POSIX_MALLOC_THRESHOLD is 10; it can be changed by --with-posix-malloc-threshold
1734 when configuring.
1735
1736 32. The default maximum size of a compiled pattern is 64K. There have been a
1737 few cases of people hitting this limit. The code now uses macros to handle the
1738 storing of links as offsets within the compiled pattern. It defaults to 2-byte
1739 links, but this can be changed to 3 or 4 bytes by --with-link-size when
1740 configuring. Tests 2 and 5 work only with 2-byte links because they output
1741 debugging information about compiled patterns.
1742
1743 33. Internal code re-arrangements:
1744
1745 (a) Moved the debugging function for printing out a compiled regex into
1746 its own source file (printint.c) and used #include to pull it into
1747 pcretest.c and, when DEBUG is defined, into pcre.c, instead of having two
1748 separate copies.
1749
1750 (b) Defined the list of op-code names for debugging as a macro in
1751 internal.h so that it is next to the definition of the opcodes.
1752
1753 (c) Defined a table of op-code lengths for simpler skipping along compiled
1754 code. This is again a macro in internal.h so that it is next to the
1755 definition of the opcodes.
1756
1757 34. Added support for recursive calls to individual subpatterns, along the
1758 lines of Robin Houston's patch (but implemented somewhat differently).
1759
1760 35. Further mods to the Makefile to help Win32. Also, added code to pcregrep to
1761 allow it to read and process whole directories in Win32. This code was
1762 contributed by Lionel Fourquaux; it has not been tested by me.
1763
1764 36. Added support for named subpatterns. The Python syntax (?P<name>...) is
1765 used to name a group. Names consist of alphanumerics and underscores, and must
1766 be unique. Back references use the syntax (?P=name) and recursive calls use
1767 (?P>name) which is a PCRE extension to the Python extension. Groups still have
1768 numbers. The function pcre_fullinfo() can be used after compilation to extract
1769 a name/number map. There are three relevant calls:
1770
1771 PCRE_INFO_NAMEENTRYSIZE yields the size of each entry in the map
1772 PCRE_INFO_NAMECOUNT yields the number of entries
1773 PCRE_INFO_NAMETABLE yields a pointer to the map.
1774
1775 The map is a vector of fixed-size entries. The size of each entry depends on
1776 the length of the longest name used. The first two bytes of each entry are the
1777 group number, most significant byte first. There follows the corresponding
1778 name, zero terminated. The names are in alphabetical order.
1779
1780 37. Make the maximum literal string in the compiled code 250 for the non-UTF-8
1781 case instead of 255. Making it the same both with and without UTF-8 support
1782 means that the same test output works with both.
1783
1784 38. There was a case of malloc(0) in the POSIX testing code in pcretest. Avoid
1785 calling malloc() with a zero argument.
1786
1787 39. Change 25 above had to resort to a heavy-handed test for the .* anchoring
1788 optimization. I've improved things by keeping a bitmap of backreferences with
1789 numbers 1-31 so that if .* occurs inside capturing brackets that are not in
1790 fact referenced, the optimization can be applied. It is unlikely that a
1791 relevant occurrence of .* (i.e. one which might indicate anchoring or forcing
1792 the match to follow \n) will appear inside brackets with a number greater than
1793 31, but if it does, any back reference > 31 suppresses the optimization.
1794
1795 40. Added a new compile-time option PCRE_NO_AUTO_CAPTURE. This has the effect
1796 of disabling numbered capturing parentheses. Any opening parenthesis that is
1797 not followed by ? behaves as if it were followed by ?: but named parentheses
1798 can still be used for capturing (and they will acquire numbers in the usual
1799 way).
1800
1801 41. Redesigned the return codes from the match() function into yes/no/error so
1802 that errors can be passed back from deep inside the nested calls. A malloc
1803 failure while inside a recursive subpattern call now causes the
1804 PCRE_ERROR_NOMEMORY return instead of quietly going wrong.
1805
1806 42. It is now possible to set a limit on the number of times the match()
1807 function is called in a call to pcre_exec(). This facility makes it possible to
1808 limit the amount of recursion and backtracking, though not in a directly
1809 obvious way, because the match() function is used in a number of different
1810 circumstances. The count starts from zero for each position in the subject
1811 string (for non-anchored patterns). The default limit is, for compatibility, a
1812 large number, namely 10 000 000. You can change this in two ways:
1813
1814 (a) When configuring PCRE before making, you can use --with-match-limit=n
1815 to set a default value for the compiled library.
1816
1817 (b) For each call to pcre_exec(), you can pass a pcre_extra block in which
1818 a different value is set. See 45 below.
1819
1820 If the limit is exceeded, pcre_exec() returns PCRE_ERROR_MATCHLIMIT.
1821
1822 43. Added a new function pcre_config(int, void *) to enable run-time extraction
1823 of things that can be changed at compile time. The first argument specifies
1824 what is wanted and the second points to where the information is to be placed.
1825 The current list of available information is:
1826
1827 PCRE_CONFIG_UTF8
1828
1829 The output is an integer that is set to one if UTF-8 support is available;
1830 otherwise it is set to zero.
1831
1832 PCRE_CONFIG_NEWLINE
1833
1834 The output is an integer that it set to the value of the code that is used for
1835 newline. It is either LF (10) or CR (13).
1836
1837 PCRE_CONFIG_LINK_SIZE
1838
1839 The output is an integer that contains the number of bytes used for internal
1840 linkage in compiled expressions. The value is 2, 3, or 4. See item 32 above.
1841
1842 PCRE_CONFIG_POSIX_MALLOC_THRESHOLD
1843
1844 The output is an integer that contains the threshold above which the POSIX
1845 interface uses malloc() for output vectors. See item 31 above.
1846
1847 PCRE_CONFIG_MATCH_LIMIT
1848
1849 The output is an unsigned integer that contains the default limit of the number
1850 of match() calls in a pcre_exec() execution. See 42 above.
1851
1852 44. pcretest has been upgraded by the addition of the -C option. This causes it
1853 to extract all the available output from the new pcre_config() function, and to
1854 output it. The program then exits immediately.
1855
1856 45. A need has arisen to pass over additional data with calls to pcre_exec() in
1857 order to support additional features. One way would have been to define
1858 pcre_exec2() (for example) with extra arguments, but this would not have been
1859 extensible, and would also have required all calls to the original function to
1860 be mapped to the new one. Instead, I have chosen to extend the mechanism that
1861 is used for passing in "extra" data from pcre_study().
1862
1863 The pcre_extra structure is now exposed and defined in pcre.h. It currently
1864 contains the following fields:
1865
1866 flags a bitmap indicating which of the following fields are set
1867 study_data opaque data from pcre_study()
1868 match_limit a way of specifying a limit on match() calls for a specific
1869 call to pcre_exec()
1870 callout_data data for callouts (see 49 below)
1871
1872 The flag bits are also defined in pcre.h, and are
1873
1874 PCRE_EXTRA_STUDY_DATA
1875 PCRE_EXTRA_MATCH_LIMIT
1876 PCRE_EXTRA_CALLOUT_DATA
1877
1878 The pcre_study() function now returns one of these new pcre_extra blocks, with
1879 the actual study data pointed to by the study_data field, and the
1880 PCRE_EXTRA_STUDY_DATA flag set. This can be passed directly to pcre_exec() as
1881 before. That is, this change is entirely upwards-compatible and requires no
1882 change to existing code.
1883
1884 If you want to pass in additional data to pcre_exec(), you can either place it
1885 in a pcre_extra block provided by pcre_study(), or create your own pcre_extra
1886 block.
1887
1888 46. pcretest has been extended to test the PCRE_EXTRA_MATCH_LIMIT feature. If a
1889 data string contains the escape sequence \M, pcretest calls pcre_exec() several
1890 times with different match limits, until it finds the minimum value needed for
1891 pcre_exec() to complete. The value is then output. This can be instructive; for
1892 most simple matches the number is quite small, but for pathological cases it
1893 gets very large very quickly.
1894
1895 47. There's a new option for pcre_fullinfo() called PCRE_INFO_STUDYSIZE. It
1896 returns the size of the data block pointed to by the study_data field in a
1897 pcre_extra block, that is, the value that was passed as the argument to
1898 pcre_malloc() when PCRE was getting memory in which to place the information
1899 created by pcre_study(). The fourth argument should point to a size_t variable.
1900 pcretest has been extended so that this information is shown after a successful
1901 pcre_study() call when information about the compiled regex is being displayed.
1902
1903 48. Cosmetic change to Makefile: there's no need to have / after $(DESTDIR)
1904 because what follows is always an absolute path. (Later: it turns out that this
1905 is more than cosmetic for MinGW, because it doesn't like empty path
1906 components.)
1907
1908 49. Some changes have been made to the callout feature (see 28 above):
1909
1910 (i) A callout function now has three choices for what it returns:
1911
1912 0 => success, carry on matching
1913 > 0 => failure at this point, but backtrack if possible
1914 < 0 => serious error, return this value from pcre_exec()
1915
1916 Negative values should normally be chosen from the set of PCRE_ERROR_xxx
1917 values. In particular, returning PCRE_ERROR_NOMATCH forces a standard
1918 "match failed" error. The error number PCRE_ERROR_CALLOUT is reserved for
1919 use by callout functions. It will never be used by PCRE itself.
1920
1921 (ii) The pcre_extra structure (see 45 above) has a void * field called
1922 callout_data, with corresponding flag bit PCRE_EXTRA_CALLOUT_DATA. The
1923 pcre_callout_block structure has a field of the same name. The contents of
1924 the field passed in the pcre_extra structure are passed to the callout
1925 function in the corresponding field in the callout block. This makes it
1926 easier to use the same callout-containing regex from multiple threads. For
1927 testing, the pcretest program has a new data escape
1928
1929 \C*n pass the number n (may be negative) as callout_data
1930
1931 If the callout function in pcretest receives a non-zero value as
1932 callout_data, it returns that value.
1933
1934 50. Makefile wasn't handling CFLAGS properly when compiling dftables. Also,
1935 there were some redundant $(CFLAGS) in commands that are now specified as
1936 $(LINK), which already includes $(CFLAGS).
1937
1938 51. Extensions to UTF-8 support are listed below. These all apply when (a) PCRE
1939 has been compiled with UTF-8 support *and* pcre_compile() has been compiled
1940 with the PCRE_UTF8 flag. Patterns that are compiled without that flag assume
1941 one-byte characters throughout. Note that case-insensitive matching applies
1942 only to characters whose values are less than 256. PCRE doesn't support the
1943 notion of cases for higher-valued characters.
1944
1945 (i) A character class whose characters are all within 0-255 is handled as
1946 a bit map, and the map is inverted for negative classes. Previously, a
1947 character > 255 always failed to match such a class; however it should
1948 match if the class was a negative one (e.g. [^ab]). This has been fixed.
1949
1950 (ii) A negated character class with a single character < 255 is coded as
1951 "not this character" (OP_NOT). This wasn't working properly when the test
1952 character was multibyte, either singly or repeated.
1953
1954 (iii) Repeats of multibyte characters are now handled correctly in UTF-8
1955 mode, for example: \x{100}{2,3}.
1956
1957 (iv) The character escapes \b, \B, \d, \D, \s, \S, \w, and \W (either
1958 singly or repeated) now correctly test multibyte characters. However,
1959 PCRE doesn't recognize any characters with values greater than 255 as
1960 digits, spaces, or word characters. Such characters always match \D, \S,
1961 and \W, and never match \d, \s, or \w.
1962
1963 (v) Classes may now contain characters and character ranges with values
1964 greater than 255. For example: [ab\x{100}-\x{400}].
1965
1966 (vi) pcregrep now has a --utf-8 option (synonym -u) which makes it call
1967 PCRE in UTF-8 mode.
1968
1969 52. The info request value PCRE_INFO_FIRSTCHAR has been renamed
1970 PCRE_INFO_FIRSTBYTE because it is a byte value. However, the old name is
1971 retained for backwards compatibility. (Note that LASTLITERAL is also a byte
1972 value.)
1973
1974 53. The single man page has become too large. I have therefore split it up into
1975 a number of separate man pages. These also give rise to individual HTML pages;
1976 these are now put in a separate directory, and there is an index.html page that
1977 lists them all. Some hyperlinking between the pages has been installed.
1978
1979 54. Added convenience functions for handling named capturing parentheses.
1980
1981 55. Unknown escapes inside character classes (e.g. [\M]) and escapes that
1982 aren't interpreted therein (e.g. [\C]) are literals in Perl. This is now also
1983 true in PCRE, except when the PCRE_EXTENDED option is set, in which case they
1984 are faulted.
1985
1986 56. Introduced HOST_CC and HOST_CFLAGS which can be set in the environment when
1987 calling configure. These values are used when compiling the dftables.c program
1988 which is run to generate the source of the default character tables. They
1989 default to the values of CC and CFLAGS. If you are cross-compiling PCRE,
1990 you will need to set these values.
1991
1992 57. Updated the building process for Windows DLL, as provided by Fred Cox.
1993
1994
1995 Version 3.9 02-Jan-02
1996 ---------------------
1997
1998 1. A bit of extraneous text had somehow crept into the pcregrep documentation.
1999
2000 2. If --disable-static was given, the building process failed when trying to
2001 build pcretest and pcregrep. (For some reason it was using libtool to compile
2002 them, which is not right, as they aren't part of the library.)
2003
2004
2005 Version 3.8 18-Dec-01
2006 ---------------------
2007
2008 1. The experimental UTF-8 code was completely screwed up. It was packing the
2009 bytes in the wrong order. How dumb can you get?
2010
2011
2012 Version 3.7 29-Oct-01
2013 ---------------------
2014
2015 1. In updating pcretest to check change 1 of version 3.6, I screwed up.
2016 This caused pcretest, when used on the test data, to segfault. Unfortunately,
2017 this didn't happen under Solaris 8, where I normally test things.
2018
2019 2. The Makefile had to be changed to make it work on BSD systems, where 'make'
2020 doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
2021 isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
2022 this fix an hour or so after the initial 3.7 release.)
2023
2024
2025 Version 3.6 23-Oct-01
2026 ---------------------
2027
2028 1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
2029 offsets passed as NULL with zero offset count.
2030
2031 2. The config.guess and config.sub files had not been updated when I moved to
2032 the latest autoconf.
2033
2034
2035 Version 3.5 15-Aug-01
2036 ---------------------
2037
2038 1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
2039 had been forgotten.
2040
2041 2. By using declared but undefined structures, we can avoid using "void"
2042 definitions in pcre.h while keeping the internal definitions of the structures
2043 private.
2044
2045 3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
2046 user point of view, this means that both static and shared libraries are built
2047 by default, but this can be individually controlled. More of the work of
2048 handling this static/shared cases is now inside libtool instead of PCRE's make
2049 file.
2050
2051 4. The pcretest utility is now installed along with pcregrep because it is
2052 useful for users (to test regexs) and by doing this, it automatically gets
2053 relinked by libtool. The documentation has been turned into a man page, so
2054 there are now .1, .txt, and .html versions in /doc.
2055
2056 5. Upgrades to pcregrep:
2057 (i) Added long-form option names like gnu grep.
2058 (ii) Added --help to list all options with an explanatory phrase.
2059 (iii) Added -r, --recursive to recurse into sub-directories.
2060 (iv) Added -f, --file to read patterns from a file.
2061
2062 6. pcre_exec() was referring to its "code" argument before testing that
2063 argument for NULL (and giving an error if it was NULL).
2064
2065 7. Upgraded Makefile.in to allow for compiling in a different directory from
2066 the source directory.
2067
2068 8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
2069 options bits, the pointer it was passed was to an int instead of to an unsigned
2070 long int. This mattered only on 64-bit systems.
2071
2072 9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
2073 generated) instead of pcre.in, which it its source. Also made the same change
2074 in several of the .c files.
2075
2076 10. A new release of gcc defines printf() as a macro, which broke pcretest
2077 because it had an ifdef in the middle of a string argument for printf(). Fixed
2078 by using separate calls to printf().
2079
2080 11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
2081 script, to force use of CR or LF instead of \n in the source. On non-Unix
2082 systems, the value can be set in config.h.
2083
2084 12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
2085 absolute limit. Changed the text of the error message to make this clear, and
2086 likewise updated the man page.
2087
2088 13. The limit of 99 on the number of capturing subpatterns has been removed.
2089 The new limit is 65535, which I hope will not be a "real" limit.
2090
2091
2092 Version 3.4 22-Aug-00
2093 ---------------------
2094
2095 1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
2096
2097 2. Diagnose condition (?(0) as an error instead of crashing on matching.
2098
2099
2100 Version 3.3 01-Aug-00
2101 ---------------------
2102
2103 1. If an octal character was given, but the value was greater than \377, it
2104 was not getting masked to the least significant bits, as documented. This could
2105 lead to crashes in some systems.
2106
2107 2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
2108 the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
2109
2110 3. Added the functions pcre_free_substring() and pcre_free_substring_list().
2111 These just pass their arguments on to (pcre_free)(), but they are provided
2112 because some uses of PCRE bind it to non-C systems that can call its functions,
2113 but cannot call free() or pcre_free() directly.
2114
2115 4. Add "make test" as a synonym for "make check". Corrected some comments in
2116 the Makefile.
2117
2118 5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
2119 Makefile.
2120
2121 6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
2122 command called pgrep for grepping around the active processes.
2123
2124 7. Added the beginnings of support for UTF-8 character strings.
2125
2126 8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
2127 RANLIB to ./ltconfig so that they are used by libtool. I think these are all
2128 the relevant ones. (AR is not passed because ./ltconfig does its own figuring
2129 out for the ar command.)
2130
2131
2132 Version 3.2 12-May-00
2133 ---------------------
2134
2135 This is purely a bug fixing release.
2136
2137 1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
2138 of ZA. This was just one example of several cases that could provoke this bug,
2139 which was introduced by change 9 of version 2.00. The code for breaking
2140 infinite loops after an iteration that matches an empty string was't working
2141 correctly.
2142
2143 2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
2144 when matched against abbab (for example). After matching an empty string, it
2145 wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
2146 caused it to match further down the string than it should.
2147
2148 3. The code contained an inclusion of sys/types.h. It isn't clear why this
2149 was there because it doesn't seem to be needed, and it causes trouble on some
2150 systems, as it is not a Standard C header. It has been removed.
2151
2152 4. Made 4 silly changes to the source to avoid stupid compiler warnings that
2153 were reported on the Macintosh. The changes were from
2154
2155 while ((c = *(++ptr)) != 0 && c != '\n');
2156 to
2157 while ((c = *(++ptr)) != 0 && c != '\n') ;
2158
2159 Totally extraordinary, but if that's what it takes...
2160
2161 5. PCRE is being used in one environment where neither memmove() nor bcopy() is
2162 available. Added HAVE_BCOPY and an autoconf test for it; if neither
2163 HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
2164 assumes the way PCRE uses memmove() (always moving upwards).
2165
2166 6. PCRE is being used in one environment where strchr() is not available. There
2167 was only one use in pcre.c, and writing it out to avoid strchr() probably gives
2168 faster code anyway.
2169
2170
2171 Version 3.1 09-Feb-00
2172 ---------------------
2173
2174 The only change in this release is the fixing of some bugs in Makefile.in for
2175 the "install" target:
2176
2177 (1) It was failing to install pcreposix.h.
2178
2179 (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
2180
2181
2182 Version 3.0 01-Feb-00
2183 ---------------------
2184
2185 1. Add support for the /+ modifier to perltest (to output $` like it does in
2186 pcretest).
2187
2188 2. Add support for the /g modifier to perltest.
2189
2190 3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
2191 matches null strings.
2192
2193 4. Fix perltest so that it doesn't do unwanted things when fed an empty
2194 pattern. Perl treats empty patterns specially - it reuses the most recent
2195 pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
2196 effect.
2197
2198 5. The POSIX interface was broken in that it was just handing over the POSIX
2199 captured string vector to pcre_exec(), but (since release 2.00) PCRE has
2200 required a bigger vector, with some working space on the end. This means that
2201 the POSIX wrapper now has to get and free some memory, and copy the results.
2202
2203 6. Added some simple autoconf support, placing the test data and the
2204 documentation in separate directories, re-organizing some of the
2205 information files, and making it build pcre-config (a GNU standard). Also added
2206 libtool support for building PCRE as a shared library, which is now the
2207 default.
2208
2209 7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
2210 09 are not valid octal constants. Single digits will be used for minor values
2211 less than 10.
2212
2213 8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
2214 existing programs that set these in the POSIX interface can use PCRE without
2215 modification.
2216
2217 9. Added a new function, pcre_fullinfo() with an extensible interface. It can
2218 return all that pcre_info() returns, plus additional data. The pcre_info()
2219 function is retained for compatibility, but is considered to be obsolete.
2220
2221 10. Added experimental recursion feature (?R) to handle one common case that
2222 Perl 5.6 will be able to do with (?p{...}).
2223
2224 11. Added support for POSIX character classes like [:alpha:], which Perl is
2225 adopting.
2226
2227
2228 Version 2.08 31-Aug-99
2229 ----------------------
2230
2231 1. When startoffset was not zero and the pattern began with ".*", PCRE was not
2232 trying to match at the startoffset position, but instead was moving forward to
2233 the next newline as if a previous match had failed.
2234
2235 2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
2236 and could get into a loop if a null string was matched other than at the start
2237 of the subject.
2238
2239 3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
2240 be distinguished at compile time, and for completeness also added PCRE_DATE.
2241
2242 5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
2243 in GnuWin32 environments.
2244
2245
2246 Version 2.07 29-Jul-99
2247 ----------------------
2248
2249 1. The documentation is now supplied in plain text form and HTML as well as in
2250 the form of man page sources.
2251
2252 2. C++ compilers don't like assigning (void *) values to other pointer types.
2253 In particular this affects malloc(). Although there is no problem in Standard
2254 C, I've put in casts to keep C++ compilers happy.
2255
2256 3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
2257 should be (const char *).
2258
2259 4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
2260 be useful for non-Unix systems who don't want to bother with the POSIX stuff.
2261 However, I haven't made this a standard facility. The documentation doesn't
2262 mention it, and the Makefile doesn't support it.
2263
2264 5. The Makefile now contains an "install" target, with editable destinations at
2265 the top of the file. The pcretest program is not installed.
2266
2267 6. pgrep -V now gives the PCRE version number and date.
2268
2269 7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
2270 causing the entire string to be ignored, instead of just the last character.
2271
2272 8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
2273 non-matching string, it can take a very, very long time, even for strings of
2274 quite modest length, because of the nested recursion. PCRE now does better in
2275 some of these cases. It does this by remembering the last required literal
2276 character in the pattern, and pre-searching the subject to ensure it is present
2277 before running the real match. In other words, it applies a heuristic to detect
2278 some types of certain failure quickly, and in the above example, if presented
2279 with a string that has no trailing " it gives "no match" very quickly.
2280
2281 9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
2282 other alternatives are tried instead.
2283
2284
2285 Version 2.06 09-Jun-99
2286 ----------------------
2287
2288 1. Change pcretest's output for amount of store used to show just the code
2289 space, because the remainder (the data block) varies in size between 32-bit and
2290 64-bit systems.
2291
2292 2. Added an extra argument to pcre_exec() to supply an offset in the subject to
2293 start matching at. This allows lookbehinds to work when searching for multiple
2294 occurrences in a string.
2295
2296 3. Added additional options to pcretest for testing multiple occurrences:
2297
2298 /+ outputs the rest of the string that follows a match
2299 /g loops for multiple occurrences, using the new startoffset argument
2300 /G loops for multiple occurrences by passing an incremented pointer
2301
2302 4. PCRE wasn't doing the "first character" optimization for patterns starting
2303 with \b or \B, though it was doing it for other lookbehind assertions. That is,
2304 it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
2305 the letter 'x'. On long subject strings, this gives a significant speed-up.
2306
2307
2308 Version 2.05 21-Apr-99
2309 ----------------------
2310
2311 1. Changed the type of magic_number from int to long int so that it works
2312 properly on 16-bit systems.
2313
2314 2. Fixed a bug which caused patterns starting with .* not to work correctly
2315 when the subject string contained newline characters. PCRE was assuming
2316 anchoring for such patterns in all cases, which is not correct because .* will
2317 not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
2318 DOTALL is set at top level; otherwise it knows that patterns starting with .*
2319 must be retried after every newline in the subject.
2320
2321
2322 Version 2.04 18-Feb-99
2323 ----------------------
2324
2325 1. For parenthesized subpatterns with repeats whose minimum was zero, the
2326 computation of the store needed to hold the pattern was incorrect (too large).
2327 If such patterns were nested a few deep, this could multiply and become a real
2328 problem.
2329
2330 2. Added /M option to pcretest to show the memory requirement of a specific
2331 pattern. Made -m a synonym of -s (which does this globally) for compatibility.
2332
2333 3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
2334 compiled in such a way that the backtracking after subsequent failure was
2335 pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
2336 ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
2337
2338
2339 Version 2.03 02-Feb-99
2340 ----------------------
2341
2342 1. Fixed typo and small mistake in man page.
2343
2344 2. Added 4th condition (GPL supersedes if conflict) and created separate
2345 LICENCE file containing the conditions.
2346
2347 3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
2348 Perl, that is the internal \ allows the delimiter to be included in the
2349 pattern. Locked out the use of \ as a delimiter. If \ immediately follows
2350 the final delimiter, add \ to the end of the pattern (to test the error).
2351
2352 4. Added the convenience functions for extracting substrings after a successful
2353 match. Updated pcretest to make it able to test these functions.
2354
2355
2356 Version 2.02 14-Jan-99
2357 ----------------------
2358
2359 1. Initialized the working variables associated with each extraction so that
2360 their saving and restoring doesn't refer to uninitialized store.
2361
2362 2. Put dummy code into study.c in order to trick the optimizer of the IBM C
2363 compiler for OS/2 into generating correct code. Apparently IBM isn't going to
2364 fix the problem.
2365
2366 3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
2367 calls, and wasn't printing the correct value for compiling calls. Increased the
2368 default value of LOOPREPEAT, and the number of significant figures in the
2369 times.
2370
2371 4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
2372
2373 5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
2374 a building problem on Windows NT with a FAT file system.
2375
2376
2377 Version 2.01 21-Oct-98
2378 ----------------------
2379
2380 1. Changed the API for pcre_compile() to allow for the provision of a pointer
2381 to character tables built by pcre_maketables() in the current locale. If NULL
2382 is passed, the default tables are used.
2383
2384
2385 Version 2.00 24-Sep-98
2386 ----------------------
2387
2388 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
2389 it any more.
2390
2391 2. Allow quantification of (?>) groups, and make it work correctly.
2392
2393 3. The first character computation wasn't working for (?>) groups.
2394
2395 4. Correct the implementation of \Z (it is permitted to match on the \n at the
2396 end of the subject) and add 5.005's \z, which really does match only at the
2397 very end of the subject.
2398
2399 5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
2400
2401 6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
2402 DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
2403 localized options. All options to pcre_study() were also removed.
2404
2405 7. Add other new features from 5.005:
2406
2407 $(?<= positive lookbehind
2408 $(?<! negative lookbehind
2409 (?imsx-imsx) added the unsetting capability
2410 such a setting is global if at outer level; local otherwise
2411 (?imsx-imsx:) non-capturing groups with option setting
2412 (?(cond)re|re) conditional pattern matching
2413
2414 A backreference to itself in a repeated group matches the previous
2415 captured string.
2416
2417 8. General tidying up of studying (both automatic and via "study")
2418 consequential on the addition of new assertions.
2419
2420 9. As in 5.005, unlimited repeated groups that could match an empty substring
2421 are no longer faulted at compile time. Instead, the loop is forcibly broken at
2422 runtime if any iteration does actually match an empty substring.
2423
2424 10. Include the RunTest script in the distribution.
2425
2426 11. Added tests from the Perl 5.005_02 distribution. This showed up a few
2427 discrepancies, some of which were old and were also with respect to 5.004. They
2428 have now been fixed.
2429
2430
2431 Version 1.09 28-Apr-98
2432 ----------------------
2433
2434 1. A negated single character class followed by a quantifier with a minimum
2435 value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
2436 program crashes, or just wrong answers. This did not apply to negated classes
2437 containing more than one character, or to minima other than one.
2438
2439
2440 Version 1.08 27-Mar-98
2441 ----------------------
2442
2443 1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
2444
2445 2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
2446 latter must appear before anything that relies on it in the pattern.
2447
2448
2449 Version 1.07 16-Feb-98
2450 ----------------------
2451
2452 1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
2453 repeat of a potentially empty string).
2454
2455
2456 Version 1.06 23-Jan-98
2457 ----------------------
2458
2459 1. Added Markus Oberhumer's little patches for C++.
2460
2461 2. Literal strings longer than 255 characters were broken.
2462
2463
2464 Version 1.05 23-Dec-97
2465 ----------------------
2466
2467 1. Negated character classes containing more than one character were failing if
2468 PCRE_CASELESS was set at run time.
2469
2470
2471 Version 1.04 19-Dec-97
2472 ----------------------
2473
2474 1. Corrected the man page, where some "const" qualifiers had been omitted.
2475
2476 2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
2477 input syntax.
2478
2479 3. Fixed memory leak which occurred when a regex with back references was
2480 matched with an offsets vector that wasn't big enough. The temporary memory
2481 that is used in this case wasn't being freed if the match failed.
2482
2483 4. Tidied pcretest to ensure it frees memory that it gets.
2484
2485 5. Temporary memory was being obtained in the case where the passed offsets
2486 vector was exactly big enough.
2487
2488 6. Corrected definition of offsetof() from change 5 below.
2489
2490 7. I had screwed up change 6 below and broken the rules for the use of
2491 setjmp(). Now fixed.
2492
2493
2494 Version 1.03 18-Dec-97
2495 ----------------------
2496
2497 1. A erroneous regex with a missing opening parenthesis was correctly
2498 diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
2499 on some systems.
2500
2501 2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
2502 it was reported that one broken compiler failed on the former because "code" is
2503 also an independent variable.
2504
2505 3. The erroneous regex a[]b caused an array overrun reference.
2506
2507 4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
2508 fail on data ending with that character. (It was going on too far, and checking
2509 the next character, typically a binary zero.) This was specific to the
2510 optimized code for single-character negative classes.
2511
2512 5. Added a contributed patch from the TIN world which does the following:
2513
2514 + Add an undef for memmove, in case the the system defines a macro for it.
2515
2516 + Add a definition of offsetof(), in case there isn't one. (I don't know
2517 the reason behind this - offsetof() is part of the ANSI standard - but
2518 it does no harm).
2519
2520 + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
2521 most of the places where whitespace preceded '#'. I have given up and
2522 allowed the remaining 2 cases to be at the margin.
2523
2524 + Rename some variables in pcre to eliminate shadowing. This seems very
2525 pedantic, but does no harm, of course.
2526
2527 6. Moved the call to setjmp() into its own function, to get rid of warnings
2528 from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
2529
2530 7. Constructs such as \d{8,} were compiling into the equivalent of
2531 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
2532 outcome, but in this particular case used more store than had been allocated,
2533 which caused the bug to be discovered because it threw up an internal error.
2534
2535 8. The debugging code in both pcre and pcretest for outputting the compiled
2536 form of a regex was going wrong in the case of back references followed by
2537 curly-bracketed repeats.
2538
2539
2540 Version 1.02 12-Dec-97
2541 ----------------------
2542
2543 1. Typos in pcre.3 and comments in the source fixed.
2544
2545 2. Applied a contributed patch to get rid of places where it used to remove
2546 'const' from variables, and fixed some signed/unsigned and uninitialized
2547 variable warnings.
2548
2549 3. Added the "runtest" target to Makefile.
2550
2551 4. Set default compiler flag to -O2 rather than just -O.
2552
2553
2554 Version 1.01 19-Nov-97
2555 ----------------------
2556
2557 1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
2558 like /([ab]*)*/, that is, for classes with more than one character in them.
2559
2560 2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
2561 as /((?>a*))*/ (a PCRE_EXTRA facility).
2562
2563
2564 Version 1.00 18-Nov-97
2565 ----------------------
2566
2567 1. Added compile-time macros to support systems such as SunOS4 which don't have
2568 memmove() or strerror() but have other things that can be used instead.
2569
2570 2. Arranged that "make clean" removes the executables.
2571
2572
2573 Version 0.99 27-Oct-97
2574 ----------------------
2575
2576 1. Fixed bug in code for optimizing classes with only one character. It was
2577 initializing a 32-byte map regardless, which could cause it to run off the end
2578 of the memory it had got.
2579
2580 2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
2581
2582
2583 Version 0.98 22-Oct-97
2584 ----------------------
2585
2586 1. Fixed bug in code for handling temporary memory usage when there are more
2587 back references than supplied space in the ovector. This could cause segfaults.
2588
2589
2590 Version 0.97 21-Oct-97
2591 ----------------------
2592
2593 1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
2594
2595 2. Optimized negated single characters not to use a bit map.
2596
2597 3. Brought error texts together as macro definitions; clarified some of them;
2598 fixed one that was wrong - it said "range out of order" when it meant "invalid
2599 escape sequence".
2600
2601 4. Changed some char * arguments to const char *.
2602
2603 5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
2604
2605 6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
2606 pcretest.
2607
2608
2609 Version 0.96 16-Oct-97
2610 ----------------------
2611
2612 1. Added a simple "pgrep" utility to the distribution.
2613
2614 2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
2615 unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
2616 where "ddd" means "one or more decimal digits".
2617
2618 3. Fixed serious bug. If a pattern had a back reference, but the call to
2619 pcre_exec() didn't supply a large enough ovector to record the related
2620 identifying subpattern, the match always failed. PCRE now remembers the number
2621 of the largest back reference, and gets some temporary memory in which to save
2622 the offsets during matching if necessary, in order to ensure that
2623 backreferences always work.
2624
2625 4. Increased the compatibility with Perl in a number of ways:
2626
2627 (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
2628 to request this handling. The option can be set at compile or exec time.
2629
2630 (b) $ matches before a terminating newline by default; an option
2631 PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
2632 mode). The option can be set at compile or exec time.
2633
2634 (c) The handling of \ followed by a digit other than 0 is now supposed to be
2635 the same as Perl's. If the decimal number it represents is less than 10
2636 or there aren't that many previous left capturing parentheses, an octal
2637 escape is read. Inside a character class, it's always an octal escape,
2638 even if it is a single digit.
2639
2640 (d) An escaped but undefined alphabetic character is taken as a literal,
2641 unless PCRE_EXTRA is set. Currently this just reserves the remaining
2642 escapes.
2643
2644 (e) {0} is now permitted. (The previous item is removed from the compiled
2645 pattern).
2646
2647 5. Changed all the names of code files so that the basic parts are no longer
2648 than 10 characters, and abolished the teeny "globals.c" file.
2649
2650 6. Changed the handling of character classes; they are now done with a 32-byte
2651 bit map always.
2652
2653 7. Added the -d and /D options to pcretest to make it possible to look at the
2654 internals of compilation without having to recompile pcre.
2655
2656
2657 Version 0.95 23-Sep-97
2658 ----------------------
2659
2660 1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
2661 \x20 at the start of a run of normal characters. These were being treated as
2662 real characters, instead of the source characters being re-checked.
2663
2664
2665 Version 0.94 18-Sep-97
2666 ----------------------
2667
2668 1. The functions are now thread-safe, with the caveat that the global variables
2669 containing pointers to malloc() and free() or alternative functions are the
2670 same for all threads.
2671
2672 2. Get pcre_study() to generate a bitmap of initial characters for non-
2673 anchored patterns when this is possible, and use it if passed to pcre_exec().
2674
2675
2676 Version 0.93 15-Sep-97
2677 ----------------------
2678
2679 1. /(b)|(:+)/ was computing an incorrect first character.
2680
2681 2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
2682 but not actually doing anything yet.
2683
2684 3. Treat "-" characters in classes that cannot be part of ranges as literals,
2685 as Perl does (e.g. [-az] or [az-]).
2686
2687 4. Set the anchored flag if a branch starts with .* or .*? because that tests
2688 all possible positions.
2689
2690 5. Split up into different modules to avoid including unneeded functions in a
2691 compiled binary. However, compile and exec are still in one module. The "study"
2692 function is split off.
2693
2694 6. The character tables are now in a separate module whose source is generated
2695 by an auxiliary program - but can then be edited by hand if required. There are
2696 now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
2697 toupper() in the code.
2698
2699 7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
2700 make them global. Abolish the function for setting them, as the caller can now
2701 set them directly.
2702
2703
2704 Version 0.92 11-Sep-97
2705 ----------------------
2706
2707 1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
2708 (e.g. /a{1,3}/) was broken (I mis-optimized it).
2709
2710 2. Caseless matching was not working in character classes if the characters in
2711 the pattern were in upper case.
2712
2713 3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
2714
2715 4. Make PCRE_ANCHORED public and accept as a compile option.
2716
2717 5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
2718 PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
2719 pass them.
2720
2721 6. Give an error if bad option bits passed at compile or run time.
2722
2723 7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
2724 pcretest to cause it to pass that flag.
2725
2726 8. Add pcre_info(), to get the number of identifying subpatterns, the stored
2727 options, and the first character, if set.
2728
2729 9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
2730
2731
2732 Version 0.91 10-Sep-97
2733 ----------------------
2734
2735 1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
2736 match the empty string as in /(a*)*/. It was looping and ultimately crashing.
2737
2738 2. PCRE was looping on encountering an indefinitely repeated back reference to
2739 a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
2740 Perl does - treats the match as successful.
2741
2742 ****

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