62 lines
2.1 KiB
Ruby
62 lines
2.1 KiB
Ruby
|
# $Id: misc.rb 14 2008-03-02 05:42:30Z warchild $
|
||
|
|
#
|
||
|
|
# Copyright (c) 2008, Jon Hart
|
||
|
|
# All rights reserved.
|
||
|
|
#
|
||
|
|
# Redistribution and use in source and binary forms, with or without
|
||
|
|
# modification, are permitted provided that the following conditions are met:
|
||
|
|
# * Redistributions of source code must retain the above copyright
|
||
|
|
# notice, this list of conditions and the following disclaimer.
|
||
|
|
# * Redistributions in binary form must reproduce the above copyright
|
||
|
|
# notice, this list of conditions and the following disclaimer in the
|
||
|
|
# documentation and/or other materials provided with the distribution.
|
||
|
|
# * Neither the name of the <organization> nor the
|
||
|
|
# names of its contributors may be used to endorse or promote products
|
||
|
|
# derived from this software without specific prior written permission.
|
||
|
|
#
|
||
|
|
# 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.
|
||
|
|
#
|
||
|
|
module Racket
|
||
|
|
module Misc
|
||
|
|
# Return a number that is at most size bits long
|
||
|
|
def Misc.randbits(size)
|
||
|
|
bits = 0
|
||
|
|
srand Time.now.usec
|
||
|
|
0.upto(size-1) {
|
||
|
|
bits <<= 1
|
||
|
|
bits |= rand(2)
|
||
|
|
}
|
||
|
|
bits
|
||
|
|
end
|
||
|
|
|
||
|
|
# Return a byte that is at most size bytes long
|
||
|
|
def Misc.randbytes(size)
|
||
|
|
bytes = 0
|
||
|
|
0.upto(size-1) {
|
||
|
|
bytes <<= 8
|
||
|
|
bytes |= randbits(8)
|
||
|
|
}
|
||
|
|
bytes
|
||
|
|
end
|
||
|
|
|
||
|
|
# Return a string that is at most size characters long
|
||
|
|
def Misc.randstring(size)
|
||
|
|
s = ""
|
||
|
|
0.upto(size-1) {
|
||
|
|
s += sprintf("%c", randbytes(1))
|
||
|
|
}
|
||
|
|
s
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
# vim: set ts=2 et sw=2:
|