casecmp

/*
 *  call-seq:
 *     str.casecmp(other_str)   => -1, 0, +1
 *  
 *  Case-insensitive version of <code>String#<=></code>.
 *     
 *     "abcdef".casecmp("abcde")     #=> 1
 *     "aBcDeF".casecmp("abcdef")    #=> 0
 *     "abcdef".casecmp("abcdefg")   #=> -1
 *     "abcdef".casecmp("ABCDEF")    #=> 0
 */

static VALUE
rb_str_casecmp(str1, str2)
    VALUE str1, str2;
{
    long len;
    int retval;

    StringValue(str2);
    len = lesser(RSTRING(str1)->len, RSTRING(str2)->len);
    retval = rb_memcicmp(RSTRING(str1)->ptr, RSTRING(str2)->ptr, len);
    if (retval == 0) {
        if (RSTRING(str1)->len == RSTRING(str2)->len) return INT2FIX(0);
        if (RSTRING(str1)->len > RSTRING(str2)->len) return INT2FIX(1);
        return INT2FIX(-1);
    }
    if (retval == 0) return INT2FIX(0);
    if (retval > 0) return INT2FIX(1);
    return INT2FIX(-1);
}