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Problem Report 0331 Details

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    Problem Report Number 0331
    Submitter's Classification Specification problem
    State Resolved
    Resolution Permanent Interpretation (PIN)
    Problem Resolution ID PIN.X.0047
    Raised 1995-06-22 08:00
    Updated 2003-03-13 08:00
    Published 1995-07-07 08:00
    Product Standard Internationalised System Calls and Libraries (XPG4)
    Certification Program The Open Brand certification program
    Test Suite VSX4 version 4.3.5
    Test Identification XPG4.os/genuts/regex 34,38
    Specification System Interfaces and Headers Issue 4
    Location in Spec See Problem Text
    Problem Summary PIN4.047 Our current regular expression library routines do not support null (empty) subexpressions. In P1003.2b/D11, null subexpressions have been removed from the standard as there definition was unspecified...
    Problem Text
    Our current regular expression library routines do not support null
    (empty) subexpressions. In P1003.2b/D11, null subexpressions have been
    removed from the standard as there definition was unspecified (or least
    ambiguous). This is a result of IEEE interpretation 1003.2-1992 #43.
    We believe the test suite should not require this behavior and should
    instead issue warnings if the implementation doesn't support null
    subexpressions.
    Test Output
    ************************************************************************
    /tset/XPG4.os/genuts/regex/T.regex 34 Failed

    Test Description:
    A basic empty subexpression matches an empty string.
    Posix.2 Ref: Component B.R.E. Assertion 2.8.3.3-80

    Test Strategy:
    CALL regcomp() with expression to compile
    VERIFY regcomp() returned 0
    CALL regexec() with string to match
    VERIFY regexec() returned 0
    VERIFY regexec() matched the expected start and end

    Test Information:
    Regular Expression : "a\(\)b"
    Flags used: none
    regcomp() returned 14, expected 0

    Regular Expression : "a\(\)c"
    Flags used: none
    regcomp() returned 14, expected 0

    ************************************************************************

    ************************************************************************
    /tset/XPG4.os/genuts/regex/T.regex 38 Failed

    Test Description:
    A backreference BRE matches an empty expression when the corresponding
    subexpression was empty.
    Posix.2 Ref: Component B.R.E. Assertion 2.8.3.2-84

    Test Strategy:
    CALL regcomp() with expression to compile
    VERIFY regcomp() returned 0
    CALL regexec() with string to match
    VERIFY regexec() returned 0
    VERIFY regexec() matched the expected start and end

    Test Information:
    Regular Expression : "\(\)"
    Flags used: none
    regcomp() returned 14, expected 0

    Regular Expression : "a\(\)b\1c"
    Flags used: none
    regcomp() returned 14, expected 0

    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    It is recommended that a permanent interpretation is granted in line with
    IEEE interpretation 1003.2-1992 number 43.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Permanent Interpretation (PIN)
    Review Conclusion
    A Permanent Interpretation is granted.

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