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Revision 15 - (hide annotations) (download)
Sat Feb 24 21:38:25 2007 UTC (7 years, 4 months ago) by nigel
File size: 10355 byte(s)
Load pcre-1.06 into code/trunk.

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

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