strnicmp

   NAME
    strnicmp  - compare two strings up to a maximum number of characters
            and case insensitive

   SYNOPSIS
    int r = strnicmp(s1, s2, n);
    const char *s1;
    const char *s2;
    int n;

   FUNCTION
    Compares two strings, returning:
        -1  s1 < s2
         0  s1 == s2
         1  s1 > s2

    strnicmp differs from strcmp in that case is ignored for alphabetic
    characters, i.e. a == A, and only up to n characters are compared.

    Refer to stricmp() and strncmp() for other examples

   NOTE
    strnicmp() converts the chars in the string to unsigned quantities
    when comparing them.  However, for portability you should not
    strnicmp() strings containing negative characters (bit 7 set) for
    anything other than checking the result against 0.  Use the
    memcmp() routine instead.

   EXAMPLE
    #include <stdio.h>
    #include <string.h>
    #include <assert.h>

    main()
    {
        char *s1 = "aBcAQ";
        char *s2 = "abCDR";
        char *s3 = "ABcXs";
        char *s4 = "aBCDxX";
        char *s5 = "aBC";
        char *x2 = "AbCDt";
        int r;

        r = strnicmp(s2, x2, 4);
        assert(r == 0);

        r = strnicmp(s2, s1, 4);
        assert(r > 0);

        r = strnicmp(s2, s3, 4);
        assert(r < 0);

        r = strnicmp(s2, s4, 8);
        assert(r < 0);

        r = strnicmp(s2, s5, 4);
        assert(r > 0);

        return(0);
    }

   INPUTS
    char *s1;   pointer to first string
    char *s2;   pointer to second string
    int n;      maximum # of characters to compare

   RESULTS
    int r;      result: -1, 0, or 1.

   SEE ALSO
    strcmp, strncmp, stricmp