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revision 5 by nigel, Sat Feb 24 21:38:05 2007 UTC revision 33 by nigel, Sat Feb 24 21:39:01 2007 UTC
# Line 2  ChangeLog for PCRE Line 2  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  Version 1.01 19-Nov-97
252  ----------------------  ----------------------
253    

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