blob: 160e49e8003bea36635bfabfa12d4542a96a1a0f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
# Linear congruential pseudorandom number generator
#
# Copyright (C) 2014 Patrick "P. J." McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
rand_x=1
rand_seeded=false
srand()
{
local x="${1}"
shift 1
rand_x=${x}
rand_seeded=true
return 0
}
rand()
{
# Automatically seed the LCG.
if ! ${rand_seeded}; then
srand $(expr ${$} + $(date '+%s'))
fi
# Increment, multiplier, and modulus values are those used in glibc.
rand_x=$((1103515245 * $rand_x + 12345))
rand_x=$(($rand_x % 4294967296))
return 0
}
|
