diff options
| -rw-r--r-- | src/local.mk | 1 | ||||
| -rw-r--r-- | src/rand.sh | 44 |
2 files changed, 45 insertions, 0 deletions
diff --git a/src/local.mk b/src/local.mk index e6679af..0ce1d77 100644 --- a/src/local.mk +++ b/src/local.mk @@ -3,6 +3,7 @@ firman_SOURCES += \ src/dist.sh \ src/flashrom.sh \ src/main.sh \ + src/rand.sh \ src/ui.sh include $(top_srcdir)/src/action/local.mk diff --git a/src/rand.sh b/src/rand.sh new file mode 100644 index 0000000..160e49e --- /dev/null +++ b/src/rand.sh @@ -0,0 +1,44 @@ +# Linear congruential pseudorandom number generator +# +# Copyright (C) 2014 Patrick "P. J." McDermott +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +rand_x=1 +rand_seeded=false + +srand() +{ + local x="${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 +} |