# -*- mode: shell-script -*-
# Shell functions for parsing the Linux kernel version.

# Kernel version number.
function kernel_version {
  if [ "${1#2.}" != "$1" ]; then
    echo "$1" | sed -n 's/^\([0-9]*\.[0-9]*\.[0-9]*\).*$/\1/p'
  else
    echo "$1" | sed -n 's/^\([0-9]*\.[0-9]*\).*$/\1/p'
  fi
}

# Last component of the kernel version, or the empty string if $1 does
# not contain a patchlevel.
function patchlevel {
  if [ "${1#2.}" != "$1" ]; then
    echo "$1" | sed -n 's/^\([0-9]*\.[0-9]*\.[0-9]*\)[.-]\(.*\)$/\2/p'
  else
    echo "$1" | sed -n 's/^\([0-9]*\.[0-9]*\)[.-]\(.*\)$/\2/p'
  fi
}