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Problem Report 1599 Details

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Report 1599 Actions

    Problem Report Number 1599
    Submitter's Classification Specification problem
    State Resolved
    Resolution Permanent Interpretation (PIN)
    Problem Resolution ID PIN.X.0156
    Raised 1996-02-20 08:00
    Updated 2003-03-13 08:00
    Published 1996-03-19 08:00
    Product Standard Internationalised System Calls and Libraries Extended (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSU version 4.1.0
    Test Identification CAPI.os/string/strncasec 4
    Specification System Interfaces and Libraries Issue 4 Version 2
    Location in Spec See Problem Text
    Problem Summary PIN4U.00022 This test may fail on implementations which do not use the ASCII character set.
    Problem Text
    This test may fail on implementations which do not use the
    ASCII character set.

    The strcasecmp() and strncasecmp() spec pages state

    These functions assume the ASCII character set when equating
    lower and upper case characters. In the POSIX locale,
    strcasecmp() and strncasecmp() do upper to lower conversions,
    then a byte comparison. The results are unspecified in other
    locales.

    We believe was not the original intent of the standard.

    By mentioning ASCII, the standard is preventing a portable implementation
    of strncasecmp() on non-ASCII platforms.

    XBD Section 4.4 pg. 41, last paragraph states

    This document set assumes that the portable character set is
    constant across all locales, but does not prohibit
    implementations from supporting two incompatible encodings
    such as ASCII and EBCIDIC.

    We believe that the ASCII requirement does not follow in the spirit
    of this passage since it reduces the portability of the function,
    and is preventing proper support of the incompatible encodings by
    requiring ASCII.

    We suggest that the strcasecmp() spec wording be made consistent
    with the tolower()/toupper() spec wording by changing the excerpt
    above to the following:

    These functions equate lower and upper case characters based
    on the character type information in the program locale
    category LC_CTYPE.

    The See Also section should be modified to refer to setlocale() in
    addition to <strings.h>
    Test Output
    400|0 4 1 10:48:39|IC Start
    200|0 4 10:48:39|TP Start
    520|0 4 40960012 1 1|SPEC1170TESTSUITE CASE 4
    520|0 4 40960012 1 2|A call to int strncasecmp(const char *s1, const cha
    520|0 4 40960012 1 3|*s2, size_t n) shall assume the ASCII character set
    520|0 4 40960012 1 4|when equating lower and upper case characters.
    520|0 4 10420239 1 1|PREP: Set locale to POSIX
    520|0 4 10420239 1 2|PREP: Set POSIX locale
    520|0 4 10420239 1 3|TEST: strncasecmp uses ASCII character set
    520|0 4 10420239 1 4|ERROR: ASCII not used. Neither strncasecmp("AbC","\141\142\143",1)
    520|0 4 10420239 1 5| nor strncasecmp("AbC","\101\102\103",1) equal zero
    520|0 4 10420239 1 6|ERROR: ASCII not used. Neither strncasecmp("AbC","\141\142\143",2)
    520|0 4 10420239 1 7| nor strncasecmp("AbC","\101\102\103",2) equal zero
    520|0 4 10420239 1 8|ERROR: ASCII not used. Neither strncasecmp("AbC","\141\142\143",3)
    520|0 4 10420239 1 9| nor strncasecmp("AbC","\101\102\103",3) equal zero
    520|0 4 10420239 1 10|ERROR: ASCII not used. Neither strncasecmp("AbC","\141\142\143",4)
    520|0 4 10420239 1 11| nor strncasecmp("AbC","\101\102\103",4) equal zero
    520|0 4 10420239 1 12|ERROR: ASCII not used. Neither strncasecmp("AbC","\141\142\143",5)
    520|0 4 10420239 1 13| nor strncasecmp("AbC","\101\102\103",5) equal zero
    520|0 4 10420239 1 14|ERROR: ASCII not used. Neither strncasecmp("AbC","\141\142\143",6)
    520|0 4 10420239 1 15| nor strncasecmp("AbC","\101\102\103",6) equal zero
    520|0 4 10420239 1 16|ERROR: ASCII not used. Neither strncasecmp("AbC","\141\142\143",7)
    520|0 4 10420239 1 17| nor strncasecmp("AbC","\101\102\103",7) equal zero
    220|0 4 1 10:48:40|FAIL
    410|0 4 1 10:48:41|IC End

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    This isn't really a grey area as the spec clearly states

    These functions assume the ASCII character set when equating
    lower and upper case characters.

    But the request has merit and we recommend it be sent to the base
    working group for resolution.

    Review Type Expert Group Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution No Resolution Given
    Review Conclusion
    The intent of the specification is not to require an ASCII encoding when
    performing a comparison.

    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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