glibc/time/yearistype

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#! /bin/sh
: '@(#)yearistype.sh 7.4'
case $#-$2 in
2-even) case $1 in
*[24680]) exit 0 ;;
*) exit 1 ;;
esac ;;
2-nonpres) case $1 in
*[02468][048]|*[13579][26]) exit 1 ;;
*) exit 0 ;;
esac ;;
2-odd) case $1 in
*[13579]) exit 0 ;;
*) exit 1 ;;
esac ;;
2-uspres) case $1 in
*[02468][048]|*[13579][26]) exit 0 ;;
*) exit 1 ;;
esac ;;
2-*) echo "$0: wild type - $2" >&2
exit 1 ;;
*) echo "$0: usage is $0 year type" >&2
exit 1 ;;
esac