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# Functions for converting date and time
#
# Copyright (C) 2019 Patrick McDermott
#
# This file is part of opkbuild.
#
# opkbuild is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# opkbuild is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with opkbuild. If not, see <http://www.gnu.org/licenses/>.
_ob_is_leap_year()
{
local year="${1}"
shift 1 || _ob_abort
return $((!(!(${year} % 4) && ${year} % 100 || !(${year} % 400))))
}
_ob_year_to_days()
{
local year="${1}"
shift 1 || _ob_abort
local y=1970
local d=0
# Simple but iterative.
while [ ${y} -ne ${year} ]; do
_ob_is_leap_year ${y} && : $((d += 366)) || : $((d += 365))
: $((y += 1))
done
printf '%d' ${d}
return 0
}
_ob_month_to_days()
{
local month="${1}"
local year="${2}"
shift 2 || _ob_abort
local d=
case ${month} in
1) d=0;; 2) d=31;; 3) d=59;; 4) d=90;;
5) d=120;; 6) d=151;; 7) d=181;; 8) d=212;;
9) d=243;; 10) d=273;; 11) d=304;; 12) d=334;;
13)d=365;;
esac
[ ${month} -ge 2 ] && _ob_is_leap_year ${year} && : $((++d))
printf '%d' ${d}
return 0
}
_ob_mktime()
{
local year="${1}"
local mon="${2}"
local mday="${3}"
local hour="${4}"
local min="${5}"
local sec="${6}"
local timezone="${7}"
shift 7 || _ob_abort
local d=
local t=
d=$(($(_ob_year_to_days ${year}) + $(_ob_month_to_days ${mon} ${year})))
d=$((${d} + ${mday} - 1))
t=$(( ( (${d} * 24 + ${hour}) * 60 + ${min}) * 60 + ${sec} ))
t=$((${t} - ${timezone}))
printf '%d' ${t}
return 0
}
_ob_mon_to_m()
{
local mon="${1}"
shift 1 || _ob_abort
local m=
case ${mon} in
Jan) m=1;; Feb) m=2;; Mar) m=3;; Apr) m=4;;
May) m=5;; Jun) m=6;; Jul) m=7;; Aug) m=8;;
Sep) m=9;; Oct) m=10;; Nov) m=11;; Dec) m=12;;
esac
printf '%d' ${m}
return 0
}
## @brief Convert a date and time into seconds since the Epoch
## @details \fBob_rfc822_mktime\fP() converts date and time formatted according
## to RFCs 822, 2822, and 5322 into non-leap seconds elapsed since the
## Epoch. It is similar to the C function \fBmktime\fP(3) except that
## it accepts a formatted string instead of a structure as its
## argument. It is intended to parse \fIchangelog\fP dates into a time
## value usable in the \fISOURCE_DATE_EPOCH\fP environment variable.
## @operand rfc822_tm req A date and time string formatted according to the
## \fIdate-time\fP symbol of RFC 5322 section 3.3.
## @return Returns 0.
## @stdout Prints the number of non-leap seconds elapsed since the Epoch.
## @pure yes This function has no side effects.
ob_rfc822_mktime()
{
local rfc822_tm="${1}"
shift 1 || _ob_abort
local wday=
local mday=
local mon=
local year=
local time=
local tz=
local hour=
local min=
local sec=
local tzsgn=
local tzhour=
local tzmin=
read wday mday mon year time tz <<-EOF
${rfc822_tm}
EOF
mon=$(_ob_mon_to_m ${mon})
IFS=':' read hour min sec <<-EOF
${time}
EOF
tzsgn="${tz%%[0-9]*}"; tzsgn="${tzsgn#+}"
tz=${tz#[+-]}; tz=${tz#0}; tz=${tz#0}
tzhour=$((${tz} / 100))
tzmin=$(( ${tz} % 100))
_ob_mktime ${year} ${mon} ${mday#0} ${hour#0} ${min#0} ${sec#0} \
$((${tzsgn}1 * (${tzhour} * 60 + ${tzmin}) * 60))
return 0
}
_ob_gmtime()
{
local timep="${1}"
shift 1 || _ob_abort
local sec=
local min=
local hour=
local days_in_year=
local year=1970
local mon=1
local mday=
sec=$((${timep} % 60)); : $((timep /= 60))
min=$((${timep} % 60)); : $((timep /= 60))
hour=$((${timep} % 24)); : $((timep /= 24))
while :; do
_ob_is_leap_year ${year} && days_in_year=366 || days_in_year=365
[ ${timep} -lt ${days_in_year} ] && break
: $((timep -= ${days_in_year}))
: $((year += 1))
done
while [ ${timep} -ge $(_ob_month_to_days $((${mon} + 1)) ${year}) ]; do
: $((mon += 1))
done
mday=$((${timep} - $(_ob_month_to_days ${mon} ${year}) + 1))
printf '%d %d %d %d %d %d' \
${year} ${mon} ${mday} ${hour} ${min} ${sec}
return 0
}
## @brief Convert seconds since the Epoch into a date and time
## @details \fBob_iso8601_gmtime\fP() converts the number of non-leap seconds
## elapsed since the Epoch into date and time in UTC formatted
## according to ISO 8601. It is similar to the C function
## \fBgmtime\fP(3) except that it returns a formatted string instead of
## a structure. It is intended to generate a date and time usable with
## a POSIX-conformant \fBtouch\fP utility.
## @operand timep req The number of non-leap seconds elapsed since the Epoch.
## @return Returns 0.
## @stdout Prints the date and time in UTC formatted according to ISO 8601.
## @pure yes This function has no side effects.
ob_iso8601_gmtime()
{
local timep="${1}"
shift 1 || _ob_abort
printf '%04d-%02d-%02dT%02d:%02d:%02dZ' $(_ob_gmtime "${timep}")
return 0
}
## @brief Convert seconds since the Epoch into a date and time
## @details \fBob_touch_t_gmtime\fP() converts the number of non-leap seconds
## elapsed since the Epoch into date and time in UTC formatted for the
## \fB-t\fP option of the \fBtouch\fP utility according to POSIX. It
## is similar to the C function \fBgmtime\fP(3) except that it returns
## a formatted string instead of a structure.
## @operand timep req The number of non-leap seconds elapsed since the Epoch.
## @return Returns 0.
## @stdout Prints the date and time in UTC formatted for the \fBtouch\fP
## utility's \fB-t\fP option.
## @pure yes This function has no side effects.
ob_touch_t_gmtime()
{
local timep="${1}"
shift 1 || _ob_abort
# [[CC]YY]MMDDhhmm[.SS]
printf '%04d%02d%02d%02d%02d.%02d' $(_ob_gmtime "${timep}")
return 0
}
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