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#!/bin/sh
CONFIGDIR="$(dirname $0)/config"
show_help() {
cat <<-EOF
usage: ./configure [-c version] [-p version | -x version]
Options:
-c version Specify the version of ISO/IEC 9899 to conform to
-p version Specify the version of IEEE 1003.1/ISO/IED 9945-1 to
conform to
-x version Specify the version of the Single Unix Specification
(aka X/Open System Interface) to conform to
Valid options for -c are:
$(cat ${CONFIGDIR}/versions.c)
Valid options for -p are:
$(cat ${CONFIGDIR}/versions.posix)
Valid options for -x are:
$(cat ${CONFIGDIR}/versions.xopen)
EOF
}
validate_version() {
versfile="${CONFIGDIR}/versions.$1"
for ver in $(awk '/^[0-9]/ { print $1 }' "${versfile}"); do
if [ "$2" = "${ver}" ]; then
echo $2
return 0
fi
done
echo 0
}
double_check_version() {
if [ "$2" = "0" ]; then
printf 'Invalid version "%s". Valid versions are:\n' $3
cat "${CONFIGDIR}/versions.$1"
exit 1
fi
}
option=
standard_c=
posix=
xopen=
while getopts hc:p:x: option; do
case ${option} in
c) standard_c=$(validate_version c ${OPTARG})
double_check_version c ${standard_c} ${OPTARG}
;;
p) posix=$(validate_version posix ${OPTARG})
double_check_version posix ${posix} ${OPTARG}
;;
x) xopen=$(validate_version xopen ${OPTARG})
double_check_version xopen ${xopen} ${OPTARG}
;;
h) show_help
exit 0
;;
?) printf 'Unknown option "%c". Try "-h" for help.\n' $option
exit 1
;;
esac
done
if [ -z "${standard_c}" ] && [ -z "${posix}" ] && [ -z "${xopen}" ]; then
xopen=700
fi
if [ -n "${posix}" ] && [ -n "${xopen}" ]; then
printf 'Specify only one of "-x" or "-p".\n'
exit 1
fi
if [ -n "${xopen}" ]; then
if [ $xopen -eq 700 ]; then
posix=200809
elif [ $xopen -eq 600 ]; then
posix=200112
elif [ $xopen -eq 500 ]; then
posix=199506
else
posix=2
fi
fi
if [ -z "${standard_c}" ] && [ -n "${posix}" ]; then
if [ $posix -ge 200112 ]; then
standard_c=199901
else
standard_c=1
fi
fi
if [ ${posix:-0} -ge 200112 ] && [ $standard_c -lt 199901 ]; then
printf 'POSIX.1-2001 and newer require C99 or newer.\n'
exit 1
fi
printf 'ISO C: %d\n' ${standard_c}
printf 'POSIX: %d\n' ${posix}
printf 'X/OPEN: %d\n' ${xopen}
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