minix/lib/libc/time/tzselect.ksh
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

473 lines
12 KiB
Bash

#! /bin/bash
#
# $NetBSD: tzselect.ksh,v 1.9 2013/09/20 19:06:54 christos Exp $
#
PKGVERSION='(tzcode) '
TZVERSION=see_Makefile
REPORT_BUGS_TO=tz@iana.org
# 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 a Posix-like shell with the extension of a
# 'select' statement. The 'select' statement was introduced in the
# Korn shell and is available in Bash and other shell implementations.
# If your host lacks both Bash and the Korn shell, you can get their
# source from one of these locations:
#
# Bash <http://www.gnu.org/software/bash/bash.html>
# Korn Shell <http://www.kornshell.com/>
# Public Domain Korn Shell <http://www.cs.mun.ca/~michael/pdksh/>
#
# 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,
# you can use either of the following free programs instead:
#
# Gawk (GNU awk) <http://www.gnu.org/software/gawk/>
# mawk <http://invisible-island.net/mawk/>
# 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
}
coord=
location_limit=10
usage="Usage: tzselect [--version] [--help] [-c COORD] [-n LIMIT]
Select a time zone interactively.
Options:
-c COORD
Instead of asking for continent and then country and then city,
ask for selection from time zones whose largest cities
are closest to the location with geographical coordinates COORD.
COORD should use ISO 6709 notation, for example, '-c +4852+00220'
for Paris (in degrees and minutes, North and East), or
'-c -35-058' for Buenos Aires (in degrees, South and West).
-n LIMIT
Display at most LIMIT locations when -c is used (default $location_limit).
--version
Output version information.
--help
Output this help.
Report bugs to $REPORT_BUGS_TO."
while getopts c:n:-: opt
do
case $opt$OPTARG in
c*)
coord=$OPTARG ;;
n*)
location_limit=$OPTARG ;;
-help)
exec echo "$usage" ;;
-version)
exec echo "tzselect $PKGVERSION$TZVERSION" ;;
-*)
echo >&2 "$0: -$opt$OPTARG: unknown option; try '$0 --help'"; exit 1 ;;
*)
echo >&2 "$0: try '$0 --help'"; exit 1 ;;
esac
done
shift $((OPTIND-1))
case $# in
0) ;;
*) echo >&2 "$0: $1: unknown argument"; exit 1 ;;
esac
# Make sure the tables are readable.
TZ_COUNTRY_TABLE=$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
# Awk script to read a time zone table and output the same table,
# with each column preceded by its distance from 'here'.
output_distances='
BEGIN {
FS = "\t"
while (getline <TZ_COUNTRY_TABLE)
if ($0 ~ /^[^#]/)
country[$1] = $2
country["US"] = "US" # Otherwise the strings get too long.
}
function convert_coord(coord, deg, min, ilen, sign, sec) {
if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9][0-9][0-9]([^0-9]|$)/) {
degminsec = coord
intdeg = degminsec < 0 ? -int(-degminsec / 10000) : int(degminsec / 10000)
minsec = degminsec - intdeg * 10000
intmin = minsec < 0 ? -int(-minsec / 100) : int(minsec / 100)
sec = minsec - intmin * 100
deg = (intdeg * 3600 + intmin * 60 + sec) / 3600
} else if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9]([^0-9]|$)/) {
degmin = coord
intdeg = degmin < 0 ? -int(-degmin / 100) : int(degmin / 100)
min = degmin - intdeg * 100
deg = (intdeg * 60 + min) / 60
} else
deg = coord
return deg * 0.017453292519943296
}
function convert_latitude(coord) {
match(coord, /..*[-+]/)
return convert_coord(substr(coord, 1, RLENGTH - 1))
}
function convert_longitude(coord) {
match(coord, /..*[-+]/)
return convert_coord(substr(coord, RLENGTH))
}
# Great-circle distance between points with given latitude and longitude.
# Inputs and output are in radians. This uses the great-circle special
# case of the Vicenty formula for distances on ellipsoids.
function dist(lat1, long1, lat2, long2, dlong, x, y, num, denom) {
dlong = long2 - long1
x = cos (lat2) * sin (dlong)
y = cos (lat1) * sin (lat2) - sin (lat1) * cos (lat2) * cos (dlong)
num = sqrt (x * x + y * y)
denom = sin (lat1) * sin (lat2) + cos (lat1) * cos (lat2) * cos (dlong)
return atan2(num, denom)
}
BEGIN {
coord_lat = convert_latitude(coord)
coord_long = convert_longitude(coord)
}
/^[^#]/ {
here_lat = convert_latitude($2)
here_long = convert_longitude($2)
line = $1 "\t" $2 "\t" $3 "\t" country[$1]
if (NF == 4)
line = line " - " $4
printf "%g\t%s\n", dist(coord_lat, coord_long, here_lat, here_long), line
}
'
# 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=
case $coord in
?*)
continent=coord;;
'')
# Ask the user for continent or ocean.
echo >&2 'Please select a continent, ocean, "coord", or "TZ".'
quoted_continents=$(
$AWK -F'\t' '
/^[^#]/ {
entry = substr($3, 1, index($3, "/") - 1)
if (entry == "America")
entry = entry "s"
if (entry ~ /^(Arctic|Atlantic|Indian|Pacific)$/)
entry = entry " Ocean"
printf "'\''%s'\''\n", entry
}
' $TZ_ZONE_TABLE |
sort -u |
tr '\n' ' '
echo ''
)
eval '
select continent in '"$quoted_continents"' \
"coord - I want to use geographical coordinates." \
"TZ - 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
'
esac
case $continent in
'')
exit 1;;
TZ)
# 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;;
*)
case $continent in
coord)
case $coord in
'')
echo >&2 'Please enter coordinates' \
'in ISO 6709 notation.'
echo >&2 'For example, +4042-07403 stands for'
echo >&2 '40 degrees 42 minutes north,' \
'74 degrees 3 minutes west.'
read coord;;
esac
distance_table=$($AWK \
-v coord="$coord" \
-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
"$output_distances" <$TZ_ZONE_TABLE |
sort -n |
sed "${location_limit}q"
)
regions=$(echo "$distance_table" | $AWK '
BEGIN { FS = "\t" }
{ print $NF }
')
echo >&2 'Please select one of the following' \
'time zone regions,'
echo >&2 'listed roughly in increasing order' \
"of distance from $coord".
select region in $regions
do
case $region in
'') echo >&2 'Please enter a number in range.';;
?*) break;;
esac
done
TZ=$(echo "$distance_table" | $AWK -v region="$region" '
BEGIN { FS="\t" }
$NF == region { print $4 }
')
;;
*)
# Get list of names of countries in the continent or ocean.
countries=$($AWK -F'\t' \
-v continent="$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' \
'whose clocks agree with yours.'
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)
esac
# 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%$coord in
?*%?*%) echo >&2 " $country$newline $region";;
?*%%) echo >&2 " $country";;
%?*%?*) echo >&2 " coord $coord$newline $region";;
%%?*) echo >&2 " coord $coord";;
+) echo >&2 " TZ='$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 coord=
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"