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Load pcre-2.03 into code/trunk.

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

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