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authorPhilip Paeps <philip@FreeBSD.org>2022-08-16 07:24:21 +0000
committerPhilip Paeps <philip@FreeBSD.org>2022-08-16 07:24:21 +0000
commit9b5369d383baf54651be0922591eeb6263ce029d (patch)
treeb1cd2f21627ee78ae3e40234e7530e3a65b8c212 /tzselect.ksh
parent157c2da9c527cd9ebae03b07bdae90e474d5a403 (diff)
Unsplit vendor import of tzcode 2010nvendor/tzcode/unsplit
Historically, to work around CVS limitations, imports on the tzcode vendor branch were split into subdirectories, which were then merged to their respective counterparts in contrib. In the Git era, this split is unnecessary and adds more work. Undo the split for the most recent vendor import of tzcode 2010n to prepare for the vendor import of tzcode 2022c.
Diffstat (limited to 'tzselect.ksh')
-rw-r--r--tzselect.ksh323
1 files changed, 323 insertions, 0 deletions
diff --git a/tzselect.ksh b/tzselect.ksh
new file mode 100644
index 000000000000..7b805336ab5d
--- /dev/null
+++ b/tzselect.ksh
@@ -0,0 +1,323 @@
+#! /bin/ksh
+
+VERSION='@(#)tzselect.ksh 8.2'
+
+# Ask the user about the time zone, and output the resulting TZ value to stdout.
+# Interact with the user via stderr and stdin.
+
+# Contributed by Paul Eggert.
+
+# Porting notes:
+#
+# This script requires several features of the Korn shell.
+# If your host lacks the Korn shell,
+# you can use either of the following free programs instead:
+#
+# <a href=ftp://ftp.gnu.org/pub/gnu/>
+# Bourne-Again shell (bash)
+# </a>
+#
+# <a href=ftp://ftp.cs.mun.ca/pub/pdksh/pdksh.tar.gz>
+# Public domain ksh
+# </a>
+#
+# This script also uses several features of modern awk programs.
+# If your host lacks awk, or has an old awk that does not conform to Posix.2,
+# you can use either of the following free programs instead:
+#
+# <a href=ftp://ftp.gnu.org/pub/gnu/>
+# GNU awk (gawk)
+# </a>
+#
+# <a href=ftp://ftp.whidbey.net/pub/brennan/>
+# mawk
+# </a>
+
+
+# Specify default values for environment variables if they are unset.
+: ${AWK=awk}
+: ${TZDIR=$(pwd)}
+
+# Check for awk Posix compliance.
+($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1
+[ $? = 123 ] || {
+ echo >&2 "$0: Sorry, your \`$AWK' program is not Posix compatible."
+ exit 1
+}
+
+if [ "$1" = "--help" ]; then
+ cat <<EOF
+Usage: tzselect
+Select a time zone interactively.
+
+Report bugs to tz@elsie.nci.nih.gov.
+EOF
+ exit 0
+elif [ "$1" = "--version" ]; then
+ cat <<EOF
+tzselect $VERSION
+EOF
+ exit 0
+fi
+
+# Make sure the tables are readable.
+TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab
+TZ_ZONE_TABLE=$TZDIR/zone.tab
+for f in $TZ_COUNTRY_TABLE $TZ_ZONE_TABLE
+do
+ <$f || {
+ echo >&2 "$0: time zone files are not set up correctly"
+ exit 1
+ }
+done
+
+newline='
+'
+IFS=$newline
+
+
+# Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout.
+case $(echo 1 | (select x in x; do break; done) 2>/dev/null) in
+?*) PS3=
+esac
+
+
+# Begin the main loop. We come back here if the user wants to retry.
+while
+
+ echo >&2 'Please identify a location' \
+ 'so that time zone rules can be set correctly.'
+
+ continent=
+ country=
+ region=
+
+
+ # Ask the user for continent or ocean.
+
+ echo >&2 'Please select a continent or ocean.'
+
+ select continent in \
+ Africa \
+ Americas \
+ Antarctica \
+ 'Arctic Ocean' \
+ Asia \
+ 'Atlantic Ocean' \
+ Australia \
+ Europe \
+ 'Indian Ocean' \
+ 'Pacific Ocean' \
+ 'none - I want to specify the time zone using the Posix TZ format.'
+ do
+ case $continent in
+ '')
+ echo >&2 'Please enter a number in range.';;
+ ?*)
+ case $continent in
+ Americas) continent=America;;
+ *' '*) continent=$(expr "$continent" : '\([^ ]*\)')
+ esac
+ break
+ esac
+ done
+ case $continent in
+ '')
+ exit 1;;
+ none)
+ # Ask the user for a Posix TZ string. Check that it conforms.
+ while
+ echo >&2 'Please enter the desired value' \
+ 'of the TZ environment variable.'
+ echo >&2 'For example, GST-10 is a zone named GST' \
+ 'that is 10 hours ahead (east) of UTC.'
+ read TZ
+ $AWK -v TZ="$TZ" 'BEGIN {
+ tzname = "[^-+,0-9][^-+,0-9][^-+,0-9]+"
+ time = "[0-2]?[0-9](:[0-5][0-9](:[0-5][0-9])?)?"
+ offset = "[-+]?" time
+ date = "(J?[0-9]+|M[0-9]+\.[0-9]+\.[0-9]+)"
+ datetime = "," date "(/" time ")?"
+ tzpattern = "^(:.*|" tzname offset "(" tzname \
+ "(" offset ")?(" datetime datetime ")?)?)$"
+ if (TZ ~ tzpattern) exit 1
+ exit 0
+ }'
+ do
+ echo >&2 "\`$TZ' is not a conforming" \
+ 'Posix time zone string.'
+ done
+ TZ_for_date=$TZ;;
+ *)
+ # Get list of names of countries in the continent or ocean.
+ countries=$($AWK -F'\t' \
+ -v continent="$continent" \
+ -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+ '
+ /^#/ { next }
+ $3 ~ ("^" continent "/") {
+ if (!cc_seen[$1]++) cc_list[++ccs] = $1
+ }
+ END {
+ while (getline <TZ_COUNTRY_TABLE) {
+ if ($0 !~ /^#/) cc_name[$1] = $2
+ }
+ for (i = 1; i <= ccs; i++) {
+ country = cc_list[i]
+ if (cc_name[country]) {
+ country = cc_name[country]
+ }
+ print country
+ }
+ }
+ ' <$TZ_ZONE_TABLE | sort -f)
+
+
+ # If there's more than one country, ask the user which one.
+ case $countries in
+ *"$newline"*)
+ echo >&2 'Please select a country.'
+ select country in $countries
+ do
+ case $country in
+ '') echo >&2 'Please enter a number in range.';;
+ ?*) break
+ esac
+ done
+
+ case $country in
+ '') exit 1
+ esac;;
+ *)
+ country=$countries
+ esac
+
+
+ # Get list of names of time zone rule regions in the country.
+ regions=$($AWK -F'\t' \
+ -v country="$country" \
+ -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+ '
+ BEGIN {
+ cc = country
+ while (getline <TZ_COUNTRY_TABLE) {
+ if ($0 !~ /^#/ && country == $2) {
+ cc = $1
+ break
+ }
+ }
+ }
+ $1 == cc { print $4 }
+ ' <$TZ_ZONE_TABLE)
+
+
+ # If there's more than one region, ask the user which one.
+ case $regions in
+ *"$newline"*)
+ echo >&2 'Please select one of the following' \
+ 'time zone regions.'
+ select region in $regions
+ do
+ case $region in
+ '') echo >&2 'Please enter a number in range.';;
+ ?*) break
+ esac
+ done
+ case $region in
+ '') exit 1
+ esac;;
+ *)
+ region=$regions
+ esac
+
+ # Determine TZ from country and region.
+ TZ=$($AWK -F'\t' \
+ -v country="$country" \
+ -v region="$region" \
+ -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+ '
+ BEGIN {
+ cc = country
+ while (getline <TZ_COUNTRY_TABLE) {
+ if ($0 !~ /^#/ && country == $2) {
+ cc = $1
+ break
+ }
+ }
+ }
+ $1 == cc && $4 == region { print $3 }
+ ' <$TZ_ZONE_TABLE)
+
+ # Make sure the corresponding zoneinfo file exists.
+ TZ_for_date=$TZDIR/$TZ
+ <$TZ_for_date || {
+ echo >&2 "$0: time zone files are not set up correctly"
+ exit 1
+ }
+ esac
+
+
+ # Use the proposed TZ to output the current date relative to UTC.
+ # Loop until they agree in seconds.
+ # Give up after 8 unsuccessful tries.
+
+ extra_info=
+ for i in 1 2 3 4 5 6 7 8
+ do
+ TZdate=$(LANG=C TZ="$TZ_for_date" date)
+ UTdate=$(LANG=C TZ=UTC0 date)
+ TZsec=$(expr "$TZdate" : '.*:\([0-5][0-9]\)')
+ UTsec=$(expr "$UTdate" : '.*:\([0-5][0-9]\)')
+ case $TZsec in
+ $UTsec)
+ extra_info="
+Local time is now: $TZdate.
+Universal Time is now: $UTdate."
+ break
+ esac
+ done
+
+
+ # Output TZ info and ask the user to confirm.
+
+ echo >&2 ""
+ echo >&2 "The following information has been given:"
+ echo >&2 ""
+ case $country+$region in
+ ?*+?*) echo >&2 " $country$newline $region";;
+ ?*+) echo >&2 " $country";;
+ +) echo >&2 " TZ='$TZ'"
+ esac
+ echo >&2 ""
+ echo >&2 "Therefore TZ='$TZ' will be used.$extra_info"
+ echo >&2 "Is the above information OK?"
+
+ ok=
+ select ok in Yes No
+ do
+ case $ok in
+ '') echo >&2 'Please enter 1 for Yes, or 2 for No.';;
+ ?*) break
+ esac
+ done
+ case $ok in
+ '') exit 1;;
+ Yes) break
+ esac
+do :
+done
+
+case $SHELL in
+*csh) file=.login line="setenv TZ '$TZ'";;
+*) file=.profile line="TZ='$TZ'; export TZ"
+esac
+
+echo >&2 "
+You can make this change permanent for yourself by appending the line
+ $line
+to the file '$file' in your home directory; then log out and log in again.
+
+Here is that TZ value again, this time on standard output so that you
+can use the $0 command in shell scripts:"
+
+echo "$TZ"
generated by cgit v1.3 (git 2.53.0) at 2026-09-07 02:40:09 +0000