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