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

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