/[pcre]/code/tags/pcre-3.7/ChangeLog
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Contents of /code/tags/pcre-3.7/ChangeLog

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Revision 27 - (show annotations) (download)
Sat Feb 24 21:38:49 2007 UTC (7 years, 5 months ago) by nigel
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Load pcre-2.02 into code/trunk.

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

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