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Sat Feb 24 21:38:21 2007 UTC (7 years, 7 months ago) by nigel
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Load pcre-1.05 into code/trunk.

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

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