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ChangeLog for PCRE
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------------------
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Version 1.05 23-Dec-97
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----------------------
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1. Negated character classes containing more than one character were failing if
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PCRE_CASELESS was set at run time.
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Version 1.04 19-Dec-97
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----------------------
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1. Corrected the man page, where some "const" qualifiers had been omitted.
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2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
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input syntax.
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3. Fixed memory leak which occurred when a regex with back references was
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matched with an offsets vector that wasn't big enough. The temporary memory
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that is used in this case wasn't being freed if the match failed.
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4. Tidied pcretest to ensure it frees memory that it gets.
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5. Temporary memory was being obtained in the case where the passed offsets
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vector was exactly big enough.
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6. Corrected definition of offsetof() from change 5 below.
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7. I had screwed up change 6 below and broken the rules for the use of
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setjmp(). Now fixed.
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Version 1.03 18-Dec-97
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----------------------
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1. A erroneous regex with a missing opening parenthesis was correctly
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diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
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on some systems.
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2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
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it was reported that one broken compiler failed on the former because "code" is
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also an independent variable.
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3. The erroneous regex a[]b caused an array overrun reference.
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4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
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fail on data ending with that character. (It was going on too far, and checking
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the next character, typically a binary zero.) This was specific to the
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optimized code for single-character negative classes.
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5. Added a contributed patch from the TIN world which does the following:
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+ Add an undef for memmove, in case the the system defines a macro for it.
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+ Add a definition of offsetof(), in case there isn't one. (I don't know
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the reason behind this - offsetof() is part of the ANSI standard - but
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it does no harm).
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+ Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
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most of the places where whitespace preceded '#'. I have given up and
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allowed the remaining 2 cases to be at the margin.
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+ Rename some variables in pcre to eliminate shadowing. This seems very
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pedantic, but does no harm, of course.
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6. Moved the call to setjmp() into its own function, to get rid of warnings
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from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
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7. Constructs such as \d{8,} were compiling into the equivalent of
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\d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
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outcome, but in this particular case used more store than had been allocated,
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which caused the bug to be discovered because it threw up an internal error.
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8. The debugging code in both pcre and pcretest for outputting the compiled
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form of a regex was going wrong in the case of back references followed by
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curly-bracketed repeats.
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Version 1.02 12-Dec-97
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----------------------
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1. Typos in pcre.3 and comments in the source fixed.
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2. Applied a contributed patch to get rid of places where it used to remove
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'const' from variables, and fixed some signed/unsigned and uninitialized
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variable warnings.
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3. Added the "runtest" target to Makefile.
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4. Set default compiler flag to -O2 rather than just -O.
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Version 1.01 19-Nov-97
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----------------------
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1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
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like /([ab]*)*/, that is, for classes with more than one character in them.
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2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
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as /((?>a*))*/ (a PCRE_EXTRA facility).
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Version 1.00 18-Nov-97
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----------------------
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1. Added compile-time macros to support systems such as SunOS4 which don't have
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memmove() or strerror() but have other things that can be used instead.
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2. Arranged that "make clean" removes the executables.
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Version 0.99 27-Oct-97
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----------------------
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1. Fixed bug in code for optimizing classes with only one character. It was
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initializing a 32-byte map regardless, which could cause it to run off the end
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of the memory it had got.
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2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
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Version 0.98 22-Oct-97
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----------------------
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1. Fixed bug in code for handling temporary memory usage when there are more
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back references than supplied space in the ovector. This could cause segfaults.
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Version 0.97 21-Oct-97
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----------------------
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1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
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2. Optimized negated single characters not to use a bit map.
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3. Brought error texts together as macro definitions; clarified some of them;
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fixed one that was wrong - it said "range out of order" when it meant "invalid
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escape sequence".
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4. Changed some char * arguments to const char *.
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5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
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6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
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pcretest.
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Version 0.96 16-Oct-97
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----------------------
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1. Added a simple "pgrep" utility to the distribution.
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2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
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unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
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where "ddd" means "one or more decimal digits".
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3. Fixed serious bug. If a pattern had a back reference, but the call to
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pcre_exec() didn't supply a large enough ovector to record the related
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identifying subpattern, the match always failed. PCRE now remembers the number
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of the largest back reference, and gets some temporary memory in which to save
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the offsets during matching if necessary, in order to ensure that
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backreferences always work.
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4. Increased the compatibility with Perl in a number of ways:
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(a) . no longer matches \n by default; an option PCRE_DOTALL is provided
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to request this handling. The option can be set at compile or exec time.
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(b) $ matches before a terminating newline by default; an option
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PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
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mode). The option can be set at compile or exec time.
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(c) The handling of \ followed by a digit other than 0 is now supposed to be
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the same as Perl's. If the decimal number it represents is less than 10
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or there aren't that many previous left capturing parentheses, an octal
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escape is read. Inside a character class, it's always an octal escape,
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even if it is a single digit.
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(d) An escaped but undefined alphabetic character is taken as a literal,
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unless PCRE_EXTRA is set. Currently this just reserves the remaining
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escapes.
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(e) {0} is now permitted. (The previous item is removed from the compiled
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pattern).
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5. Changed all the names of code files so that the basic parts are no longer
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than 10 characters, and abolished the teeny "globals.c" file.
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6. Changed the handling of character classes; they are now done with a 32-byte
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bit map always.
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7. Added the -d and /D options to pcretest to make it possible to look at the
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internals of compilation without having to recompile pcre.
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Version 0.95 23-Sep-97
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----------------------
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1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
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\x20 at the start of a run of normal characters. These were being treated as
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real characters, instead of the source characters being re-checked.
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Version 0.94 18-Sep-97
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----------------------
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1. The functions are now thread-safe, with the caveat that the global variables
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containing pointers to malloc() and free() or alternative functions are the
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same for all threads.
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2. Get pcre_study() to generate a bitmap of initial characters for non-
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anchored patterns when this is possible, and use it if passed to pcre_exec().
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Version 0.93 15-Sep-97
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----------------------
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1. /(b)|(:+)/ was computing an incorrect first character.
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2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
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but not actually doing anything yet.
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3. Treat "-" characters in classes that cannot be part of ranges as literals,
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as Perl does (e.g. [-az] or [az-]).
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4. Set the anchored flag if a branch starts with .* or .*? because that tests
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all possible positions.
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5. Split up into different modules to avoid including unneeded functions in a
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compiled binary. However, compile and exec are still in one module. The "study"
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function is split off.
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6. The character tables are now in a separate module whose source is generated
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by an auxiliary program - but can then be edited by hand if required. There are
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now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
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toupper() in the code.
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7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
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make them global. Abolish the function for setting them, as the caller can now
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set them directly.
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Version 0.92 11-Sep-97
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----------------------
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1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
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(e.g. /a{1,3}/) was broken (I mis-optimized it).
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2. Caseless matching was not working in character classes if the characters in
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the pattern were in upper case.
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3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
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4. Make PCRE_ANCHORED public and accept as a compile option.
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5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
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PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
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pass them.
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6. Give an error if bad option bits passed at compile or run time.
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7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
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pcretest to cause it to pass that flag.
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8. Add pcre_info(), to get the number of identifying subpatterns, the stored
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options, and the first character, if set.
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9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
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Version 0.91 10-Sep-97
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----------------------
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1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
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match the empty string as in /(a*)*/. It was looping and ultimately crashing.
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2. PCRE was looping on encountering an indefinitely repeated back reference to
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a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
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Perl does - treats the match as successful.
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****
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