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ChangeLog for PCRE |
ChangeLog for PCRE |
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Version 8.0 02 Jul-08 |
Version 7.8 25-Aug-08 |
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1. Replaced UCP searching code with optimized version as implemented for Ad |
1. Replaced UCP searching code with optimized version as implemented for Ad |
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Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two- |
Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two- |
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stage table and inline lookup instead of a function, giving speed ups of 2 |
stage table and inline lookup instead of a function, giving speed ups of 2 |
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to 5 times on some simple patterns that I tested. Permission was given to |
to 5 times on some simple patterns that I tested. Permission was given to |
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distribute the MultiStage2.py script that generates the tables (it's not in |
distribute the MultiStage2.py script that generates the tables (it's not in |
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the tarball, but is in the Subversion repository). |
the tarball, but is in the Subversion repository). |
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2. Updated the Unicode datatables to Unicode 5.1.0. This adds yet more |
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scripts. |
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3. Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained |
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a group with a zero qualifier. The result of the study could be incorrect, |
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or the function might crash, depending on the pattern. |
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4. Caseless matching was not working for non-ASCII characters in back |
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references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}. |
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It now works when Unicode Property Support is available. |
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5. In pcretest, an escape such as \x{de} in the data was always generating |
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a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in |
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non-UTF-8 mode. If the value is greater than 255, it gives a warning about |
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truncation. |
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6. Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...). |
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7. Added two (int) casts to pcregrep when printing the difference of two |
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pointers, in case they are 64-bit values. |
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8. Added comments about Mac OS X stack usage to the pcrestack man page and to |
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test 2 if it fails. |
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9. Added PCRE_CALL_CONVENTION just before the names of all exported functions, |
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and a #define of that name to empty if it is not externally set. This is to |
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allow users of MSVC to set it if necessary. |
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10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from |
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the convenience functions in the pcre_get.c source file. |
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11. An option change at the start of a pattern that had top-level alternatives |
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could cause overwriting and/or a crash. This command provoked a crash in |
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some environments: |
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printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest |
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This potential security problem was recorded as CVE-2008-2371. |
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12. For a pattern where the match had to start at the beginning or immediately |
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after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and |
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pcre_dfa_exec() could read past the end of the passed subject if there was |
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no match. To help with detecting such bugs (e.g. with valgrind), I modified |
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pcretest so that it places the subject at the end of its malloc-ed buffer. |
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13. The change to pcretest in 12 above threw up a couple more cases when pcre_ |
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exec() might read past the end of the data buffer in UTF-8 mode. |
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14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and |
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the data contained the byte 0x85 as part of a UTF-8 character within its |
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first line. This applied both to normal and DFA matching. |
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15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example, |
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/^[^d]*?$/8 failed to match "abc". |
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16. Added a missing copyright notice to pcrecpp_internal.h. |
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17. Make it more clear in the documentation that values returned from |
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pcre_exec() in ovector are byte offsets, not character counts. |
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Version 7.7 07-May-08 |
Version 7.7 07-May-08 |
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