/[pcre]/code/trunk/ChangeLog
ViewVC logotype

Contents of /code/trunk/ChangeLog

Parent Directory Parent Directory | Revision Log Revision Log


Revision 25 - (show annotations) (download)
Sat Feb 24 21:38:45 2007 UTC (7 years, 7 months ago) by nigel
File size: 13129 byte(s)
Load pcre-2.01 into code/trunk.

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

webmaster@exim.org
ViewVC Help
Powered by ViewVC 1.1.12