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revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 81 by nigel, Sat Feb 24 21:40:59 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 6.2 01-Aug-05
5    ---------------------
7     1. There was no test for integer overflow of quantifier values. A construction
8        such as {1111111111111111} would give undefined results. What is worse, if
9        a minimum quantifier for a parenthesized subpattern overflowed and became
10        negative, the calculation of the memory size went wrong. This could have
11        led to memory overwriting.
13     2. Building PCRE using VPATH was broken. Hopefully it is now fixed.
15     3. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
16        operating environments where this matters.
18     4. Applied Giuseppe Maxia's patch to add additional features for controlling
19        PCRE options from within the C++ wrapper.
21     5. Named capturing subpatterns were not being correctly counted when a pattern
22        was compiled. This caused two problems: (a) If there were more than 100
23        such subpatterns, the calculation of the memory needed for the whole
24        compiled pattern went wrong, leading to an overflow error. (b) Numerical
25        back references of the form \12, where the number was greater than 9, were
26        not recognized as back references, even though there were sufficient
27        previous subpatterns.
29     6. Two minor patches to pcrecpp.cc in order to allow it to compile on older
30        versions of gcc, e.g. 2.95.4.
33    Version 6.1 21-Jun-05
34    ---------------------
36     1. There was one reference to the variable "posix" in pcretest.c that was not
37        surrounded by "#if !defined NOPOSIX".
39     2. Make it possible to compile pcretest without DFA support, UTF8 support, or
40        the cross-check on the old pcre_info() function, for the benefit of the
41        cut-down version of PCRE that is currently imported into Exim.
43     3. A (silly) pattern starting with (?i)(?-i) caused an internal space
44        allocation error. I've done the easy fix, which wastes 2 bytes for sensible
45        patterns that start (?i) but I don't think that matters. The use of (?i) is
46        just an example; this all applies to the other options as well.
48     4. Since libtool seems to echo the compile commands it is issuing, the output
49        from "make" can be reduced a bit by putting "@" in front of each libtool
50        compile command.
52     5. Patch from the folks at Google for configure.in to be a bit more thorough
53        in checking for a suitable C++ installation before trying to compile the
54        C++ stuff. This should fix a reported problem when a compiler was present,
55        but no suitable headers.
57     6. The man pages all had just "PCRE" as their title. I have changed them to
58        be the relevant file name. I have also arranged that these names are
59        retained in the file doc/pcre.txt, which is a concatenation in text format
60        of all the man pages except the little individual ones for each function.
62     7. The NON-UNIX-USE file had not been updated for the different set of source
63        files that come with release 6. I also added a few comments about the C++
64        wrapper.
67    Version 6.0 07-Jun-05
68    ---------------------
70     1. Some minor internal re-organization to help with my DFA experiments.
72     2. Some missing #ifdef SUPPORT_UCP conditionals in pcretest and printint that
73        didn't matter for the library itself when fully configured, but did matter
74        when compiling without UCP support, or within Exim, where the ucp files are
75        not imported.
77     3. Refactoring of the library code to split up the various functions into
78        different source modules. The addition of the new DFA matching code (see
79        below) to a single monolithic source would have made it really too
80        unwieldy, quite apart from causing all the code to be include in a
81        statically linked application, when only some functions are used. This is
82        relevant even without the DFA addition now that patterns can be compiled in
83        one application and matched in another.
85        The downside of splitting up is that there have to be some external
86        functions and data tables that are used internally in different modules of
87        the library but which are not part of the API. These have all had their
88        names changed to start with "_pcre_" so that they are unlikely to clash
89        with other external names.
91     4. Added an alternate matching function, pcre_dfa_exec(), which matches using
92        a different (DFA) algorithm. Although it is slower than the original
93        function, it does have some advantages for certain types of matching
94        problem.
96     5. Upgrades to pcretest in order to test the features of pcre_dfa_exec(),
97        including restarting after a partial match.
99     6. A patch for pcregrep that defines INVALID_FILE_ATTRIBUTES if it is not
100        defined when compiling for Windows was sent to me. I have put it into the
101        code, though I have no means of testing or verifying it.
103     7. Added the pcre_refcount() auxiliary function.
105     8. Added the PCRE_FIRSTLINE option. This constrains an unanchored pattern to
106        match before or at the first newline in the subject string. In pcretest,
107        the /f option on a pattern can be used to set this.
109     9. A repeated \w when used in UTF-8 mode with characters greater than 256
110        would behave wrongly. This has been present in PCRE since release 4.0.
112    10. A number of changes to the pcregrep command:
114        (a) Refactored how -x works; insert ^(...)$ instead of setting
115            PCRE_ANCHORED and checking the length, in preparation for adding
116            something similar for -w.
118        (b) Added the -w (match as a word) option.
120        (c) Refactored the way lines are read and buffered so as to have more
121            than one at a time available.
123        (d) Implemented a pcregrep test script.
125        (e) Added the -M (multiline match) option. This allows patterns to match
126            over several lines of the subject. The buffering ensures that at least
127            8K, or the rest of the document (whichever is the shorter) is available
128            for matching (and similarly the previous 8K for lookbehind assertions).
130        (f) Changed the --help output so that it now says
132              -w, --word-regex(p)
134            instead of two lines, one with "regex" and the other with "regexp"
135            because that confused at least one person since the short forms are the
136            same. (This required a bit of code, as the output is generated
137            automatically from a table. It wasn't just a text change.)
139        (g) -- can be used to terminate pcregrep options if the next thing isn't an
140            option but starts with a hyphen. Could be a pattern or a path name
141            starting with a hyphen, for instance.
143        (h) "-" can be given as a file name to represent stdin.
145        (i) When file names are being printed, "(standard input)" is used for
146            the standard input, for compatibility with GNU grep. Previously
147            "<stdin>" was used.
149        (j) The option --label=xxx can be used to supply a name to be used for
150            stdin when file names are being printed. There is no short form.
152        (k) Re-factored the options decoding logic because we are going to add
153            two more options that take data. Such options can now be given in four
154            different ways, e.g. "-fname", "-f name", "--file=name", "--file name".
156        (l) Added the -A, -B, and -C options for requesting that lines of context
157            around matches be printed.
159        (m) Added the -L option to print the names of files that do not contain
160            any matching lines, that is, the complement of -l.
162        (n) The return code is 2 if any file cannot be opened, but pcregrep does
163            continue to scan other files.
165        (o) The -s option was incorrectly implemented. For compatibility with other
166            greps, it now suppresses the error message for a non-existent or non-
167            accessible file (but not the return code). There is a new option called
168            -q that suppresses the output of matching lines, which was what -s was
169            previously doing.
171        (p) Added --include and --exclude options to specify files for inclusion
172            and exclusion when recursing.
174    11. The Makefile was not using the Autoconf-supported LDFLAGS macro properly.
175        Hopefully, it now does.
177    12. Missing cast in pcre_study().
179    13. Added an "uninstall" target to the makefile.
181    14. Replaced "extern" in the function prototypes in Makefile.in with
182        "PCRE_DATA_SCOPE", which defaults to 'extern' or 'extern "C"' in the Unix
183        world, but is set differently for Windows.
185    15. Added a second compiling function called pcre_compile2(). The only
186        difference is that it has an extra argument, which is a pointer to an
187        integer error code. When there is a compile-time failure, this is set
188        non-zero, in addition to the error test pointer being set to point to an
189        error message. The new argument may be NULL if no error number is required
190        (but then you may as well call pcre_compile(), which is now just a
191        wrapper). This facility is provided because some applications need a
192        numeric error indication, but it has also enabled me to tidy up the way
193        compile-time errors are handled in the POSIX wrapper.
195    16. Added VPATH=.libs to the makefile; this should help when building with one
196        prefix path and installing with another. (Or so I'm told by someone who
197        knows more about this stuff than I do.)
199    17. Added a new option, REG_DOTALL, to the POSIX function regcomp(). This
200        passes PCRE_DOTALL to the pcre_compile() function, making the "." character
201        match everything, including newlines. This is not POSIX-compatible, but
202        somebody wanted the feature. From pcretest it can be activated by using
203        both the P and the s flags.
205    18. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one.
207    19. libpcre.pc was being incorrectly installed as executable.
209    20. A couple of places in pcretest check for end-of-line by looking for '\n';
210        it now also looks for '\r' so that it will work unmodified on Windows.
212    21. Added Google's contributed C++ wrapper to the distribution.
214    22. Added some untidy missing memory free() calls in pcretest, to keep
215        Electric Fence happy when testing.
219  Version 5.0 13-Sep-04  Version 5.0 13-Sep-04
220  ---------------------  ---------------------

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