strnlen.h

[Mark D. Baushke]

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I am confused about why some code does this:

#if defined HAVE_DECL_STRNLEN && !HAVE_DECL_STRNLEN

and other code does this:

#if !HAVE_DECL_GETADDRINFO

If you must check for it being defined, wouldn't this form

#if !defined HAVE_DECL_STRNLEN || !HAVE_DECL_STRNLEN

be more correct?

There are similar constructs in these files:

    argp-namefrob.h
    getpass.h
    memmem.h
    snprintf.h
    strdup.h
    strtok_r.h
    timegm.h
    vsnprintf.h

I know that the current configure script appears to generate either a

    #define HAVE_DECL_STRNLEN 0
or
    #define HAVE_DECL_STRNLEN 1

but is that the case for all HAVE_DECL_* macros?

        Curious,
        -- Mark
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