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revision 3 by nigel, Sat Feb 24 21:38:01 2007 UTC revision 21 by nigel, Sat Feb 24 21:38:37 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    
5    Version 1.09 28 Apr-98
6    ----------------------
7    
8    1. A negated single character class followed by a quantifier with a minimum
9    value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
10    program crashes, or just wrong answers. This did not apply to negated classes
11    containing more than one character, or to minima other than one.
12    
13    
14    Version 1.08 27-Mar-98
15    ----------------------
16    
17    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
18    
19    2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
20    latter must appear before anything that relies on it in the pattern.
21    
22    
23    Version 1.07 16-Feb-98
24    ----------------------
25    
26    1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
27    repeat of a potentially empty string).
28    
29    
30    Version 1.06 23-Jan-98
31    ----------------------
32    
33    1. Added Markus Oberhumer's little patches for C++.
34    
35    2. Literal strings longer than 255 characters were broken.
36    
37    
38    Version 1.05 23-Dec-97
39    ----------------------
40    
41    1. Negated character classes containing more than one character were failing if
42    PCRE_CASELESS was set at run time.
43    
44    
45    Version 1.04 19-Dec-97
46    ----------------------
47    
48    1. Corrected the man page, where some "const" qualifiers had been omitted.
49    
50    2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
51    input syntax.
52    
53    3. Fixed memory leak which occurred when a regex with back references was
54    matched with an offsets vector that wasn't big enough. The temporary memory
55    that is used in this case wasn't being freed if the match failed.
56    
57    4. Tidied pcretest to ensure it frees memory that it gets.
58    
59    5. Temporary memory was being obtained in the case where the passed offsets
60    vector was exactly big enough.
61    
62    6. Corrected definition of offsetof() from change 5 below.
63    
64    7. I had screwed up change 6 below and broken the rules for the use of
65    setjmp(). Now fixed.
66    
67    
68    Version 1.03 18-Dec-97
69    ----------------------
70    
71    1. A erroneous regex with a missing opening parenthesis was correctly
72    diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
73    on some systems.
74    
75    2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
76    it was reported that one broken compiler failed on the former because "code" is
77    also an independent variable.
78    
79    3. The erroneous regex a[]b caused an array overrun reference.
80    
81    4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
82    fail on data ending with that character. (It was going on too far, and checking
83    the next character, typically a binary zero.) This was specific to the
84    optimized code for single-character negative classes.
85    
86    5. Added a contributed patch from the TIN world which does the following:
87    
88      + Add an undef for memmove, in case the the system defines a macro for it.
89    
90      + Add a definition of offsetof(), in case there isn't one. (I don't know
91        the reason behind this - offsetof() is part of the ANSI standard - but
92        it does no harm).
93    
94      + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
95        most of the places where whitespace preceded '#'. I have given up and
96        allowed the remaining 2 cases to be at the margin.
97    
98      + Rename some variables in pcre to eliminate shadowing. This seems very
99        pedantic, but does no harm, of course.
100    
101    6. Moved the call to setjmp() into its own function, to get rid of warnings
102    from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
103    
104    7. Constructs such as \d{8,} were compiling into the equivalent of
105    \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
106    outcome, but in this particular case used more store than had been allocated,
107    which caused the bug to be discovered because it threw up an internal error.
108    
109    8. The debugging code in both pcre and pcretest for outputting the compiled
110    form of a regex was going wrong in the case of back references followed by
111    curly-bracketed repeats.
112    
113    
114    Version 1.02 12-Dec-97
115    ----------------------
116    
117    1. Typos in pcre.3 and comments in the source fixed.
118    
119    2. Applied a contributed patch to get rid of places where it used to remove
120    'const' from variables, and fixed some signed/unsigned and uninitialized
121    variable warnings.
122    
123    3. Added the "runtest" target to Makefile.
124    
125    4. Set default compiler flag to -O2 rather than just -O.
126    
127    
128    Version 1.01 19-Nov-97
129    ----------------------
130    
131    1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
132    like /([ab]*)*/, that is, for classes with more than one character in them.
133    
134    2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
135    as /((?>a*))*/ (a PCRE_EXTRA facility).
136    
137    
138    Version 1.00 18-Nov-97
139    ----------------------
140    
141    1. Added compile-time macros to support systems such as SunOS4 which don't have
142    memmove() or strerror() but have other things that can be used instead.
143    
144    2. Arranged that "make clean" removes the executables.
145    
146    
147  Version 0.99 27-Oct-97  Version 0.99 27-Oct-97
148  ----------------------  ----------------------
149    

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