Module: Misc

$Id: misc.rb 14 2008-03-02 05:42:30Z warchild $

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THIS SOFTWARE IS PROVIDED BY Jon Hart ``AS IS’’ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Jon Hart BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Methods

macaddr randbits randbytes randstring

Public Class methods

macaddr(long)

given a long representing a MAC address print it out in human readable form

[Source]

# File lib/misc.rb, line 61
  def Misc.macaddr(long)
    long.to_s(16).rjust(12, '0').unpack("a2a2a2a2a2a2").join(":")
  end

randbits(size)

Return a number that is at most size bits long

[Source]

# File lib/misc.rb, line 30
  def Misc.randbits(size)
    bits = 0
    srand Time.now.usec
    0.upto(size-1) {
      bits <<= 1
      bits |= rand(2)
    }
    bits
  end

randbytes(size)

Return a byte that is at most size bytes long

[Source]

# File lib/misc.rb, line 41
  def Misc.randbytes(size)
    bytes = 0
    0.upto(size-1) {
      bytes <<= 8
      bytes |= randbits(8)
    }
    bytes
  end

randstring(size)

Return a string that is at most size characters long

[Source]

# File lib/misc.rb, line 51
  def Misc.randstring(size)
    s = ""
    0.upto(size-1) {
      s += sprintf("%c", randbytes(1))
    }
    s
  end