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# -*- tcl -*-
# # ## ### ##### ######## #############
# (C) 2009 Andreas Kupries
# @@ Meta Begin
# Package tcl::randomseed 1
# Meta as::author {Andreas Kupries}
# Meta as::copyright 2009
# Meta as::license BSD
# Meta description Generate and combine seed lists for the
# Meta description random number generator inside of the
# Meta description tcl::chan::random channel. Sources of
# Meta description randomness are process id, time in two
# Meta description granularities, and Tcl's random number
# Meta description generator.
# Meta platform tcl
# Meta require {Tcl 8.5}
# @@ Meta End
# # ## ### ##### ######## #############
package require Tcl 8.5
# # ## ### ##### ######## #############
namespace eval ::tcl {}
proc ::tcl::randomseed {} {
set result {}
foreach v [list \
[pid] \
[clock seconds] \
[expr {int(256*rand())}] \
[clock clicks -milliseconds]] \
{
lappend result [expr {$v % 256}]
}
return $result
}
proc ::tcl::combine {a b} {
while {[llength $a] < [llength $b]} {
lappend a 0
}
while {[llength $b] < [llength $a]} {
lappend b 0
}
set result {}
foreach x $a y $b {
lappend result [expr {($x ^ $y) % 256}]
}
return $result
}
# # ## ### ##### ######## #############
package provide tcl::randomseed 1
return
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