AC_FUNC_MEMMEM

[Peter Miller]

The man page for memmem(1) details numerous bugs found in previous
versions of gnu libc:

        This function was broken in Linux libraries up to and including
        libc 5.0.9;  there the ‘needle’ and ‘haystack’ arguments were
        interchanged, and a pointer to the end of the first  occurrence
        of  needle  was returned.  Since libc 5.0.9 is still widely
        used, this is a dangerous function to use.  Both old and new
        libc’s have the bug that if needle is empty haystack-1 (instead
        of  haystack) is returned.  And glibc 2.0 makes it worse, and
        returns a pointer to the last byte of ‘haystack’.  This is fixed
        in glibc 2.1.

It would be very helpful if GNU Autoconf had a AC_FUNC_MEMMEM macro to
detect correct memmem(3) implementations.


Regards
Peter Miller <address@hidden>
/\/\*        http://miller.emu.id.au/pmiller/

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"I consider C++ the most significant technical hazard to the survival of
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