/[pcre]/code/tags/pcre-1.03/ChangeLog
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Contents of /code/tags/pcre-1.03/ChangeLog

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Sat Feb 24 21:38:15 2007 UTC (7 years, 7 months ago) by nigel
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Tag code/trunk as code/tags/pcre-1.03.

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

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