timezone/yearistype

   1 #! /bin/sh
   2
   3 : '@(#)yearistype.sh    7.8'
   4
   5 case $#-$1 in
   6         2-|2-0*|2-*[!0-9]*)
   7                 echo "$0: wild year - $1" >&2
   8                 exit 1 ;;
   9 esac
  10
  11 case $#-$2 in
  12         2-even)
  13                 case $1 in
  14                         *[24680])                       exit 0 ;;
  15                         *)                              exit 1 ;;
  16                 esac ;;
  17         2-nonpres|2-nonuspres)
  18                 case $1 in
  19                         *[02468][048]|*[13579][26])     exit 1 ;;
  20                         *)                              exit 0 ;;
  21                 esac ;;
  22         2-odd)
  23                 case $1 in
  24                         *[13579])                       exit 0 ;;
  25                         *)                              exit 1 ;;
  26                 esac ;;
  27         2-uspres)
  28                 case $1 in
  29                         *[02468][048]|*[13579][26])     exit 0 ;;
  30                         *)                              exit 1 ;;
  31                 esac ;;
  32         2-*)
  33                 echo "$0: wild type - $2" >&2 ;;
  34 esac
  35
  36 echo "$0: usage is $0 year even|odd|uspres|nonpres|nonuspres" >&2
  37 exit 1