/[pcre]/code/tags/pcre-3.8/ChangeLog
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Sat Feb 24 21:38:17 2007 UTC (7 years, 1 month ago) by nigel
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Load pcre-1.04 into code/trunk.

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

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