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Sat Feb 24 21:38:29 2007 UTC (7 years, 2 months ago) by nigel
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Load pcre-1.07 into code/trunk.

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

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