external/public-domain/tz/dist/yearistype.sh

   1 #! /bin/sh
   2
   3 : 'This file is in the public domain, so clarified as of'
   4 : '2006-07-17 by Arthur David Olson.'
   5
   6 case $#-$1 in
   7         2-|2-0*|2-*[!0-9]*)
   8                 echo "$0: wild year: $1" >&2
   9                 exit 1 ;;
  10 esac
  11
  12 case $#-$2 in
  13         2-even)
  14                 case $1 in
  15                         *[24680])                       exit 0 ;;
  16                         *)                              exit 1 ;;
  17                 esac ;;
  18         2-nonpres|2-nonuspres)
  19                 case $1 in
  20                         *[02468][048]|*[13579][26])     exit 1 ;;
  21                         *)                              exit 0 ;;
  22                 esac ;;
  23         2-odd)
  24                 case $1 in
  25                         *[13579])                       exit 0 ;;
  26                         *)                              exit 1 ;;
  27                 esac ;;
  28         2-uspres)
  29                 case $1 in
  30                         *[02468][048]|*[13579][26])     exit 0 ;;
  31                         *)                              exit 1 ;;
  32                 esac ;;
  33         2-*)
  34                 echo "$0: wild type: $2" >&2 ;;
  35 esac
  36
  37 echo "$0: usage is $0 year even|odd|uspres|nonpres|nonuspres" >&2
  38 exit 1