/[pcre]/code/tags/pcre-6.5/ChangeLog
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Contents of /code/tags/pcre-6.5/ChangeLog

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Load pcre-2.05 into code/trunk.

1 ChangeLog for PCRE
2 ------------------
3
4
5 Version 2.05 21-Apr-99
6 ----------------------
7
8 1. Changed the type of magic_number from int to long int so that it works
9 properly on 16-bit systems.
10
11 2. Fixed a bug which caused patterns starting with .* not to work correctly
12 when the subject string contained newline characters. PCRE was assuming
13 anchoring for such patterns in all cases, which is not correct because .* will
14 not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
15 DOTALL is set at top level; otherwise it knows that patterns starting with .*
16 must be retried after every newline in the subject.
17
18
19 Version 2.04 18-Feb-99
20 ----------------------
21
22 1. For parenthesized subpatterns with repeats whose minimum was zero, the
23 computation of the store needed to hold the pattern was incorrect (too large).
24 If such patterns were nested a few deep, this could multiply and become a real
25 problem.
26
27 2. Added /M option to pcretest to show the memory requirement of a specific
28 pattern. Made -m a synonym of -s (which does this globally) for compatibility.
29
30 3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
31 compiled in such a way that the backtracking after subsequent failure was
32 pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
33 ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
34
35
36 Version 2.03 02-Feb-99
37 ----------------------
38
39 1. Fixed typo and small mistake in man page.
40
41 2. Added 4th condition (GPL supersedes if conflict) and created separate
42 LICENCE file containing the conditions.
43
44 3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
45 Perl, that is the internal \ allows the delimiter to be included in the
46 pattern. Locked out the use of \ as a delimiter. If \ immediately follows
47 the final delimiter, add \ to the end of the pattern (to test the error).
48
49 4. Added the convenience functions for extracting substrings after a successful
50 match. Updated pcretest to make it able to test these functions.
51
52
53 Version 2.02 14-Jan-99
54 ----------------------
55
56 1. Initialized the working variables associated with each extraction so that
57 their saving and restoring doesn't refer to uninitialized store.
58
59 2. Put dummy code into study.c in order to trick the optimizer of the IBM C
60 compiler for OS/2 into generating correct code. Apparently IBM isn't going to
61 fix the problem.
62
63 3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
64 calls, and wasn't printing the correct value for compiling calls. Increased the
65 default value of LOOPREPEAT, and the number of significant figures in the
66 times.
67
68 4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
69
70 5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
71 a building problem on Windows NT with a FAT file system.
72
73
74 Version 2.01 21-Oct-98
75 ----------------------
76
77 1. Changed the API for pcre_compile() to allow for the provision of a pointer
78 to character tables built by pcre_maketables() in the current locale. If NULL
79 is passed, the default tables are used.
80
81
82 Version 2.00 24-Sep-98
83 ----------------------
84
85 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
86 it any more.
87
88 2. Allow quantification of (?>) groups, and make it work correctly.
89
90 3. The first character computation wasn't working for (?>) groups.
91
92 4. Correct the implementation of \Z (it is permitted to match on the \n at the
93 end of the subject) and add 5.005's \z, which really does match only at the
94 very end of the subject.
95
96 5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
97
98 6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
99 DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
100 localized options. All options to pcre_study() were also removed.
101
102 7. Add other new features from 5.005:
103
104 $(?<= positive lookbehind
105 $(?<! negative lookbehind
106 (?imsx-imsx) added the unsetting capability
107 such a setting is global if at outer level; local otherwise
108 (?imsx-imsx:) non-capturing groups with option setting
109 (?(cond)re|re) conditional pattern matching
110
111 A backreference to itself in a repeated group matches the previous
112 captured string.
113
114 8. General tidying up of studying (both automatic and via "study")
115 consequential on the addition of new assertions.
116
117 9. As in 5.005, unlimited repeated groups that could match an empty substring
118 are no longer faulted at compile time. Instead, the loop is forcibly broken at
119 runtime if any iteration does actually match an empty substring.
120
121 10. Include the RunTest script in the distribution.
122
123 11. Added tests from the Perl 5.005_02 distribution. This showed up a few
124 discrepancies, some of which were old and were also with respect to 5.004. They
125 have now been fixed.
126
127
128 Version 1.09 28-Apr-98
129 ----------------------
130
131 1. A negated single character class followed by a quantifier with a minimum
132 value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
133 program crashes, or just wrong answers. This did not apply to negated classes
134 containing more than one character, or to minima other than one.
135
136
137 Version 1.08 27-Mar-98
138 ----------------------
139
140 1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
141
142 2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
143 latter must appear before anything that relies on it in the pattern.
144
145
146 Version 1.07 16-Feb-98
147 ----------------------
148
149 1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
150 repeat of a potentially empty string).
151
152
153 Version 1.06 23-Jan-98
154 ----------------------
155
156 1. Added Markus Oberhumer's little patches for C++.
157
158 2. Literal strings longer than 255 characters were broken.
159
160
161 Version 1.05 23-Dec-97
162 ----------------------
163
164 1. Negated character classes containing more than one character were failing if
165 PCRE_CASELESS was set at run time.
166
167
168 Version 1.04 19-Dec-97
169 ----------------------
170
171 1. Corrected the man page, where some "const" qualifiers had been omitted.
172
173 2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
174 input syntax.
175
176 3. Fixed memory leak which occurred when a regex with back references was
177 matched with an offsets vector that wasn't big enough. The temporary memory
178 that is used in this case wasn't being freed if the match failed.
179
180 4. Tidied pcretest to ensure it frees memory that it gets.
181
182 5. Temporary memory was being obtained in the case where the passed offsets
183 vector was exactly big enough.
184
185 6. Corrected definition of offsetof() from change 5 below.
186
187 7. I had screwed up change 6 below and broken the rules for the use of
188 setjmp(). Now fixed.
189
190
191 Version 1.03 18-Dec-97
192 ----------------------
193
194 1. A erroneous regex with a missing opening parenthesis was correctly
195 diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
196 on some systems.
197
198 2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
199 it was reported that one broken compiler failed on the former because "code" is
200 also an independent variable.
201
202 3. The erroneous regex a[]b caused an array overrun reference.
203
204 4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
205 fail on data ending with that character. (It was going on too far, and checking
206 the next character, typically a binary zero.) This was specific to the
207 optimized code for single-character negative classes.
208
209 5. Added a contributed patch from the TIN world which does the following:
210
211 + Add an undef for memmove, in case the the system defines a macro for it.
212
213 + Add a definition of offsetof(), in case there isn't one. (I don't know
214 the reason behind this - offsetof() is part of the ANSI standard - but
215 it does no harm).
216
217 + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
218 most of the places where whitespace preceded '#'. I have given up and
219 allowed the remaining 2 cases to be at the margin.
220
221 + Rename some variables in pcre to eliminate shadowing. This seems very
222 pedantic, but does no harm, of course.
223
224 6. Moved the call to setjmp() into its own function, to get rid of warnings
225 from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
226
227 7. Constructs such as \d{8,} were compiling into the equivalent of
228 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
229 outcome, but in this particular case used more store than had been allocated,
230 which caused the bug to be discovered because it threw up an internal error.
231
232 8. The debugging code in both pcre and pcretest for outputting the compiled
233 form of a regex was going wrong in the case of back references followed by
234 curly-bracketed repeats.
235
236
237 Version 1.02 12-Dec-97
238 ----------------------
239
240 1. Typos in pcre.3 and comments in the source fixed.
241
242 2. Applied a contributed patch to get rid of places where it used to remove
243 'const' from variables, and fixed some signed/unsigned and uninitialized
244 variable warnings.
245
246 3. Added the "runtest" target to Makefile.
247
248 4. Set default compiler flag to -O2 rather than just -O.
249
250
251 Version 1.01 19-Nov-97
252 ----------------------
253
254 1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
255 like /([ab]*)*/, that is, for classes with more than one character in them.
256
257 2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
258 as /((?>a*))*/ (a PCRE_EXTRA facility).
259
260
261 Version 1.00 18-Nov-97
262 ----------------------
263
264 1. Added compile-time macros to support systems such as SunOS4 which don't have
265 memmove() or strerror() but have other things that can be used instead.
266
267 2. Arranged that "make clean" removes the executables.
268
269
270 Version 0.99 27-Oct-97
271 ----------------------
272
273 1. Fixed bug in code for optimizing classes with only one character. It was
274 initializing a 32-byte map regardless, which could cause it to run off the end
275 of the memory it had got.
276
277 2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
278
279
280 Version 0.98 22-Oct-97
281 ----------------------
282
283 1. Fixed bug in code for handling temporary memory usage when there are more
284 back references than supplied space in the ovector. This could cause segfaults.
285
286
287 Version 0.97 21-Oct-97
288 ----------------------
289
290 1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
291
292 2. Optimized negated single characters not to use a bit map.
293
294 3. Brought error texts together as macro definitions; clarified some of them;
295 fixed one that was wrong - it said "range out of order" when it meant "invalid
296 escape sequence".
297
298 4. Changed some char * arguments to const char *.
299
300 5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
301
302 6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
303 pcretest.
304
305
306 Version 0.96 16-Oct-97
307 ----------------------
308
309 1. Added a simple "pgrep" utility to the distribution.
310
311 2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
312 unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
313 where "ddd" means "one or more decimal digits".
314
315 3. Fixed serious bug. If a pattern had a back reference, but the call to
316 pcre_exec() didn't supply a large enough ovector to record the related
317 identifying subpattern, the match always failed. PCRE now remembers the number
318 of the largest back reference, and gets some temporary memory in which to save
319 the offsets during matching if necessary, in order to ensure that
320 backreferences always work.
321
322 4. Increased the compatibility with Perl in a number of ways:
323
324 (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
325 to request this handling. The option can be set at compile or exec time.
326
327 (b) $ matches before a terminating newline by default; an option
328 PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
329 mode). The option can be set at compile or exec time.
330
331 (c) The handling of \ followed by a digit other than 0 is now supposed to be
332 the same as Perl's. If the decimal number it represents is less than 10
333 or there aren't that many previous left capturing parentheses, an octal
334 escape is read. Inside a character class, it's always an octal escape,
335 even if it is a single digit.
336
337 (d) An escaped but undefined alphabetic character is taken as a literal,
338 unless PCRE_EXTRA is set. Currently this just reserves the remaining
339 escapes.
340
341 (e) {0} is now permitted. (The previous item is removed from the compiled
342 pattern).
343
344 5. Changed all the names of code files so that the basic parts are no longer
345 than 10 characters, and abolished the teeny "globals.c" file.
346
347 6. Changed the handling of character classes; they are now done with a 32-byte
348 bit map always.
349
350 7. Added the -d and /D options to pcretest to make it possible to look at the
351 internals of compilation without having to recompile pcre.
352
353
354 Version 0.95 23-Sep-97
355 ----------------------
356
357 1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
358 \x20 at the start of a run of normal characters. These were being treated as
359 real characters, instead of the source characters being re-checked.
360
361
362 Version 0.94 18-Sep-97
363 ----------------------
364
365 1. The functions are now thread-safe, with the caveat that the global variables
366 containing pointers to malloc() and free() or alternative functions are the
367 same for all threads.
368
369 2. Get pcre_study() to generate a bitmap of initial characters for non-
370 anchored patterns when this is possible, and use it if passed to pcre_exec().
371
372
373 Version 0.93 15-Sep-97
374 ----------------------
375
376 1. /(b)|(:+)/ was computing an incorrect first character.
377
378 2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
379 but not actually doing anything yet.
380
381 3. Treat "-" characters in classes that cannot be part of ranges as literals,
382 as Perl does (e.g. [-az] or [az-]).
383
384 4. Set the anchored flag if a branch starts with .* or .*? because that tests
385 all possible positions.
386
387 5. Split up into different modules to avoid including unneeded functions in a
388 compiled binary. However, compile and exec are still in one module. The "study"
389 function is split off.
390
391 6. The character tables are now in a separate module whose source is generated
392 by an auxiliary program - but can then be edited by hand if required. There are
393 now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
394 toupper() in the code.
395
396 7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
397 make them global. Abolish the function for setting them, as the caller can now
398 set them directly.
399
400
401 Version 0.92 11-Sep-97
402 ----------------------
403
404 1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
405 (e.g. /a{1,3}/) was broken (I mis-optimized it).
406
407 2. Caseless matching was not working in character classes if the characters in
408 the pattern were in upper case.
409
410 3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
411
412 4. Make PCRE_ANCHORED public and accept as a compile option.
413
414 5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
415 PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
416 pass them.
417
418 6. Give an error if bad option bits passed at compile or run time.
419
420 7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
421 pcretest to cause it to pass that flag.
422
423 8. Add pcre_info(), to get the number of identifying subpatterns, the stored
424 options, and the first character, if set.
425
426 9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
427
428
429 Version 0.91 10-Sep-97
430 ----------------------
431
432 1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
433 match the empty string as in /(a*)*/. It was looping and ultimately crashing.
434
435 2. PCRE was looping on encountering an indefinitely repeated back reference to
436 a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
437 Perl does - treats the match as successful.
438
439 ****

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