/[pcre]/code/tags/pcre-3.6/ChangeLog
ViewVC logotype

Contents of /code/tags/pcre-3.6/ChangeLog

Parent Directory Parent Directory | Revision Log Revision Log


Revision 9 - (show annotations) (download)
Sat Feb 24 21:38:13 2007 UTC (7 years, 7 months ago) by nigel
Original Path: code/trunk/ChangeLog
File size: 9271 byte(s)
Load pcre-1.03 into code/trunk.

1 ChangeLog for PCRE
2 ------------------
3
4
5 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 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 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 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 ****

webmaster@exim.org
ViewVC Help
Powered by ViewVC 1.1.12