/[pcre]/code/tags/pcre-1.08/ChangeLog
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Contents of /code/tags/pcre-1.08/ChangeLog

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Revision 20 - (show annotations) (download)
Sat Feb 24 21:38:35 2007 UTC (7 years, 9 months ago) by nigel
File size: 10777 byte(s)
Tag code/trunk as code/tags/pcre-1.08.

1 ChangeLog for PCRE
2 ------------------
3
4
5 Version 1.08 27-Mar-98
6 ----------------------
7
8 1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
9
10 2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
11 latter must appear before anything that relies on it in the pattern.
12
13
14 Version 1.07 16-Feb-98
15 ----------------------
16
17 1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
18 repeat of a potentially empty string).
19
20
21 Version 1.06 23-Jan-98
22 ----------------------
23
24 1. Added Markus Oberhumer's little patches for C++.
25
26 2. Literal strings longer than 255 characters were broken.
27
28
29 Version 1.05 23-Dec-97
30 ----------------------
31
32 1. Negated character classes containing more than one character were failing if
33 PCRE_CASELESS was set at run time.
34
35
36 Version 1.04 19-Dec-97
37 ----------------------
38
39 1. Corrected the man page, where some "const" qualifiers had been omitted.
40
41 2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
42 input syntax.
43
44 3. Fixed memory leak which occurred when a regex with back references was
45 matched with an offsets vector that wasn't big enough. The temporary memory
46 that is used in this case wasn't being freed if the match failed.
47
48 4. Tidied pcretest to ensure it frees memory that it gets.
49
50 5. Temporary memory was being obtained in the case where the passed offsets
51 vector was exactly big enough.
52
53 6. Corrected definition of offsetof() from change 5 below.
54
55 7. I had screwed up change 6 below and broken the rules for the use of
56 setjmp(). Now fixed.
57
58
59 Version 1.03 18-Dec-97
60 ----------------------
61
62 1. A erroneous regex with a missing opening parenthesis was correctly
63 diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
64 on some systems.
65
66 2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
67 it was reported that one broken compiler failed on the former because "code" is
68 also an independent variable.
69
70 3. The erroneous regex a[]b caused an array overrun reference.
71
72 4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
73 fail on data ending with that character. (It was going on too far, and checking
74 the next character, typically a binary zero.) This was specific to the
75 optimized code for single-character negative classes.
76
77 5. Added a contributed patch from the TIN world which does the following:
78
79 + Add an undef for memmove, in case the the system defines a macro for it.
80
81 + Add a definition of offsetof(), in case there isn't one. (I don't know
82 the reason behind this - offsetof() is part of the ANSI standard - but
83 it does no harm).
84
85 + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
86 most of the places where whitespace preceded '#'. I have given up and
87 allowed the remaining 2 cases to be at the margin.
88
89 + Rename some variables in pcre to eliminate shadowing. This seems very
90 pedantic, but does no harm, of course.
91
92 6. Moved the call to setjmp() into its own function, to get rid of warnings
93 from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
94
95 7. Constructs such as \d{8,} were compiling into the equivalent of
96 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
97 outcome, but in this particular case used more store than had been allocated,
98 which caused the bug to be discovered because it threw up an internal error.
99
100 8. The debugging code in both pcre and pcretest for outputting the compiled
101 form of a regex was going wrong in the case of back references followed by
102 curly-bracketed repeats.
103
104
105 Version 1.02 12-Dec-97
106 ----------------------
107
108 1. Typos in pcre.3 and comments in the source fixed.
109
110 2. Applied a contributed patch to get rid of places where it used to remove
111 'const' from variables, and fixed some signed/unsigned and uninitialized
112 variable warnings.
113
114 3. Added the "runtest" target to Makefile.
115
116 4. Set default compiler flag to -O2 rather than just -O.
117
118
119 Version 1.01 19-Nov-97
120 ----------------------
121
122 1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
123 like /([ab]*)*/, that is, for classes with more than one character in them.
124
125 2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
126 as /((?>a*))*/ (a PCRE_EXTRA facility).
127
128
129 Version 1.00 18-Nov-97
130 ----------------------
131
132 1. Added compile-time macros to support systems such as SunOS4 which don't have
133 memmove() or strerror() but have other things that can be used instead.
134
135 2. Arranged that "make clean" removes the executables.
136
137
138 Version 0.99 27-Oct-97
139 ----------------------
140
141 1. Fixed bug in code for optimizing classes with only one character. It was
142 initializing a 32-byte map regardless, which could cause it to run off the end
143 of the memory it had got.
144
145 2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
146
147
148 Version 0.98 22-Oct-97
149 ----------------------
150
151 1. Fixed bug in code for handling temporary memory usage when there are more
152 back references than supplied space in the ovector. This could cause segfaults.
153
154
155 Version 0.97 21-Oct-97
156 ----------------------
157
158 1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
159
160 2. Optimized negated single characters not to use a bit map.
161
162 3. Brought error texts together as macro definitions; clarified some of them;
163 fixed one that was wrong - it said "range out of order" when it meant "invalid
164 escape sequence".
165
166 4. Changed some char * arguments to const char *.
167
168 5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
169
170 6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
171 pcretest.
172
173
174 Version 0.96 16-Oct-97
175 ----------------------
176
177 1. Added a simple "pgrep" utility to the distribution.
178
179 2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
180 unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
181 where "ddd" means "one or more decimal digits".
182
183 3. Fixed serious bug. If a pattern had a back reference, but the call to
184 pcre_exec() didn't supply a large enough ovector to record the related
185 identifying subpattern, the match always failed. PCRE now remembers the number
186 of the largest back reference, and gets some temporary memory in which to save
187 the offsets during matching if necessary, in order to ensure that
188 backreferences always work.
189
190 4. Increased the compatibility with Perl in a number of ways:
191
192 (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
193 to request this handling. The option can be set at compile or exec time.
194
195 (b) $ matches before a terminating newline by default; an option
196 PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
197 mode). The option can be set at compile or exec time.
198
199 (c) The handling of \ followed by a digit other than 0 is now supposed to be
200 the same as Perl's. If the decimal number it represents is less than 10
201 or there aren't that many previous left capturing parentheses, an octal
202 escape is read. Inside a character class, it's always an octal escape,
203 even if it is a single digit.
204
205 (d) An escaped but undefined alphabetic character is taken as a literal,
206 unless PCRE_EXTRA is set. Currently this just reserves the remaining
207 escapes.
208
209 (e) {0} is now permitted. (The previous item is removed from the compiled
210 pattern).
211
212 5. Changed all the names of code files so that the basic parts are no longer
213 than 10 characters, and abolished the teeny "globals.c" file.
214
215 6. Changed the handling of character classes; they are now done with a 32-byte
216 bit map always.
217
218 7. Added the -d and /D options to pcretest to make it possible to look at the
219 internals of compilation without having to recompile pcre.
220
221
222 Version 0.95 23-Sep-97
223 ----------------------
224
225 1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
226 \x20 at the start of a run of normal characters. These were being treated as
227 real characters, instead of the source characters being re-checked.
228
229
230 Version 0.94 18-Sep-97
231 ----------------------
232
233 1. The functions are now thread-safe, with the caveat that the global variables
234 containing pointers to malloc() and free() or alternative functions are the
235 same for all threads.
236
237 2. Get pcre_study() to generate a bitmap of initial characters for non-
238 anchored patterns when this is possible, and use it if passed to pcre_exec().
239
240
241 Version 0.93 15-Sep-97
242 ----------------------
243
244 1. /(b)|(:+)/ was computing an incorrect first character.
245
246 2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
247 but not actually doing anything yet.
248
249 3. Treat "-" characters in classes that cannot be part of ranges as literals,
250 as Perl does (e.g. [-az] or [az-]).
251
252 4. Set the anchored flag if a branch starts with .* or .*? because that tests
253 all possible positions.
254
255 5. Split up into different modules to avoid including unneeded functions in a
256 compiled binary. However, compile and exec are still in one module. The "study"
257 function is split off.
258
259 6. The character tables are now in a separate module whose source is generated
260 by an auxiliary program - but can then be edited by hand if required. There are
261 now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
262 toupper() in the code.
263
264 7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
265 make them global. Abolish the function for setting them, as the caller can now
266 set them directly.
267
268
269 Version 0.92 11-Sep-97
270 ----------------------
271
272 1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
273 (e.g. /a{1,3}/) was broken (I mis-optimized it).
274
275 2. Caseless matching was not working in character classes if the characters in
276 the pattern were in upper case.
277
278 3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
279
280 4. Make PCRE_ANCHORED public and accept as a compile option.
281
282 5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
283 PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
284 pass them.
285
286 6. Give an error if bad option bits passed at compile or run time.
287
288 7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
289 pcretest to cause it to pass that flag.
290
291 8. Add pcre_info(), to get the number of identifying subpatterns, the stored
292 options, and the first character, if set.
293
294 9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
295
296
297 Version 0.91 10-Sep-97
298 ----------------------
299
300 1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
301 match the empty string as in /(a*)*/. It was looping and ultimately crashing.
302
303 2. PCRE was looping on encountering an indefinitely repeated back reference to
304 a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
305 Perl does - treats the match as successful.
306
307 ****

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