Add the isodate utility.
This utility provides a way to display dates in ISO8601 format. The exact output format can be controlled. It can either display dates passed on the commandline or it can display the current date/time.
This commit is contained in:
Laurence Withers
parent
07a31fd8f7
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64c5ce0d65
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app c isodate bin
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/* libiso8601/src/isodate/000_TopSource.c
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*
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* (c)2007, Laurence Withers, <l@lwithers.me.uk>.
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* Released under the GNU GPLv2. See file COPYING or
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* http://www.gnu.org/copyleft/gpl.html for details.
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*/
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/* Below are all the includes used throughout the application. */
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#include <stdio.h>
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#include <getopt.h>
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#include <stdlib.h>
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#include "iso8601.h"
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void usage(void)
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{
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fputs("Usage:\n\n"
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" isodate [options] [date ...]\n\n"
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"Valid options:\n"
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" -h, --help Display this screen.\n"
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" -e, --extended Use extended display format.\n"
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" -y, --year Only display year.\n"
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" -n, --month Display year, month.\n"
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" -d, --day Display year, month, day [default].\n"
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" -o, --ordinal Display year, ordinal day.\n"
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" -w, --week Display ISO year, ISO week.\n"
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" -W, --week-day Display ISO year, ISO week, ISO weekday.\n"
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" -r, --hour Display hour.\n"
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" -R, --hour-fraction Display hour and fraction of hour.\n"
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" -m, --minute Display hour, minute.\n"
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" -M, --minute-fraction Display hour, minute and fraction of\n"
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" minute.\n"
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" -s, --second Display hour, minute, second.\n"
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" -S, --second-fraction Display hour, minute, second and fraction\n"
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" of second [default].\n"
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" -U, --utc-offset <n> Display time as if timezone offset was\n"
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" <n> seconds.\n"
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" -Z, --utc Display time in UTC.\n"
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"\n"
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"If specified, one or more ISO8601 dates will be parsed and displayed\n"
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"in the format given. Otherwise, the system clock will be queried and\n"
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"its time displayed.\n"
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"\n", stdout);
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}
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struct option options[] = {
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{ "help", no_argument, 0, 'h' },
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{ "extended", no_argument, 0, 'e' },
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{ "year", no_argument, 0, 'y' },
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{ "month", no_argument, 0, 'n' },
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{ "day", no_argument, 0, 'd' },
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{ "ordinal", no_argument, 0, 'o' },
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{ "week", no_argument, 0, 'w' },
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{ "week-day", no_argument, 0, 'W' },
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{ "hour", no_argument, 0, 'r' },
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{ "hour-fraction", no_argument, 0, 'R' },
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{ "minute", no_argument, 0, 'm' },
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{ "minute-fraction", no_argument, 0, 'M' },
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{ "second", no_argument, 0, 's' },
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{ "second-fraction", no_argument, 0, 'S' },
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{ "utc-offset", required_argument, 0, 'U' },
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{ "utc", no_argument, 0, 'Z' },
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{ 0, 0, 0, 0 }
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};
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int main(int argc, char* argv[])
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{
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struct iso8601_details det = {
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.date_prec = iso8601_prec_day,
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.time_prec = iso8601_prec_secfrac,
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.extended = 0,
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.tz_sec = 0
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};
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int override_tz = 0, ret = 0;
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char* endp, datestr[100];
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struct iso8601_date date;
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struct iso8601_details det2;
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while(1) {
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switch(getopt_long(argc, argv, "heyndowWrRmMsSU:Z", options, 0)) {
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case -1: goto opts_done;
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case '?': return 1;
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case 'h': usage(); return 0;
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case 'e': det.extended = 1; break;
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case 'y': det.date_prec = iso8601_prec_year; break;
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case 'n': det.date_prec = iso8601_prec_month; break;
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case 'd': det.date_prec = iso8601_prec_day; break;
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case 'o': det.date_prec = iso8601_prec_ord; break;
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case 'w': det.date_prec = iso8601_prec_week; break;
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case 'W': det.date_prec = iso8601_prec_wday; break;
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case 'r': det.time_prec = iso8601_prec_hour; break;
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case 'R': det.time_prec = iso8601_prec_hourfrac; break;
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case 'm': det.time_prec = iso8601_prec_min; break;
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case 'M': det.time_prec = iso8601_prec_minfrac; break;
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case 's': det.time_prec = iso8601_prec_sec; break;
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case 'S': det.time_prec = iso8601_prec_secfrac; break;
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case 'Z': det.tz_sec = 0; override_tz = 1; break;
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case 'U':
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endp = 0;
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det.tz_sec = strtol(optarg, &endp, 0);
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if(!endp || *endp || det.tz_sec <= -86400 || det.tz_sec >= 86400) {
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fputs("Invalid UTC offset. Must be an integral number of seconds\n"
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"between -86400 and 86400, exclusive.\n", stderr);
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return 1;
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}
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override_tz = 1;
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}
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}
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opts_done:
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if(optind == argc) {
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iso8601_now(&date, &det2);
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if(!override_tz) det.tz_sec = det2.tz_sec;
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iso8601_print(datestr, sizeof(datestr), &date, &det);
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fputs(datestr, stdout);
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putc('\n', stdout);
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} else {
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for(; optind != argc; ++optind) {
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if(iso8601_parse(argv[optind], &date, 0, &det2)) {
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fputs("Couldn't parse date.\n", stderr);
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ret = 1;
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continue;
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}
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if(!override_tz) det.tz_sec = det2.tz_sec;
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iso8601_print(datestr, sizeof(datestr), &date, &det);
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fputs(datestr, stdout);
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putc('\n', stdout);
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}
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}
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return ret;
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}
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/* options for text editors
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kate: replace-trailing-space-save true; space-indent true; tab-width 4;
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vim: expandtab:ts=4:sw=4
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*/
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# These are external variables, and shouldn't clash with anything else
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# isodate
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# isodate_BUILT
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#
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build_target libiso8601
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if [ -z ${isodate_BUILT} ]
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then
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isodate="obj/isodate"
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EXTRAS="${libiso8601} ${libiso8601_DEP_CFLAGS} ${libiso8601_DEP_LIBS}"
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echo "Building application ${isodate}..."
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do_cmd source src/isodate/build.monolithic || return 1
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MODIFIED=0
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for test in ${MONOLITHIC_TESTS} ${SRC}
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do
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if [ ${test} -nt ${isodate} ]
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then
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MODIFIED=1
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break
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fi
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done
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if [ ${MODIFIED} -ne 0 ]
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then
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echo " Compiling..."
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do_cmd ${CC} ${CFLAGS} -I obj -o "${isodate}" ${SRC} ${EXTRAS} || return 1
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print_success "Application built"
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else
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print_success "Application up to date"
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fi
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isodate_BUILT=1
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fi
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# kate: replace-trailing-space-save true; space-indent true; tab-width 4;
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# vim: syntax=sh:expandtab:ts=4:sw=4
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source src/isodate/build.app
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source src/isodate/build.install-app
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build_target isodate
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# make paths (this is for Gentoo in particular)
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build_dir_tree "${BINDIR}" || return 1
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# install binary
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echo "Installing binaries into '${BINDIR}'"
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install_file "${isodate}" "${BINDIR}" 0755 || return 1
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print_success "Done"
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# kate: replace-trailing-space-save true; space-indent true; tab-width 4;
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# vim: syntax=sh:expandtab:ts=4:sw=4
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# These are external variables, and shouldn't clash with anything else
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# isodate_MONOLITHIC
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#
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SRC="obj/isodate.c"
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MONOLITHIC_TESTS="src/isodate/build.app src/isodate/build.monolithic"
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if [ -z "${isodate_MONOLITHIC}" ]
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then
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MONOLITHIC_SOURCE="$(echo src/isodate/*.c)"
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make_monolithic ${SRC} C || return 1
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isodate_MONOLITHIC=1
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MONOLITHIC_DOC="${MONOLITHIC_DOC} ${SRC}"
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fi
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# kate: replace-trailing-space-save true; space-indent true; tab-width 4;
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# vim: syntax=sh:expandtab:ts=4:sw=4
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