Adding upstream version 2.36.1.upstream/2.36.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 611 insertions, 0 deletions

diff --git a/lib/timeutils.c b/lib/timeutils.c
new file mode 100644
index 0000000..8b443cd
--- /dev/null
+++ b/lib/timeutils.c
@@ -0,0 +1,611 @@
+/***
+  First set of functions in this file are part of systemd, and were
+  copied to util-linux at August 2013.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with util-linux; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sys/time.h>
+
+#include "c.h"
+#include "nls.h"
+#include "strutils.h"
+#include "timeutils.h"
+
+#define WHITESPACE " \t\n\r"
+
+#define streq(a,b) (strcmp((a),(b)) == 0)
+
+static int parse_sec(const char *t, usec_t *usec)
+{
+	static const struct {
+		const char *suffix;
+		usec_t usec;
+	} table[] = {
+		{ "seconds",	USEC_PER_SEC },
+		{ "second",	USEC_PER_SEC },
+		{ "sec",	USEC_PER_SEC },
+		{ "s",		USEC_PER_SEC },
+		{ "minutes",	USEC_PER_MINUTE },
+		{ "minute",	USEC_PER_MINUTE },
+		{ "min",	USEC_PER_MINUTE },
+		{ "months",	USEC_PER_MONTH },
+		{ "month",	USEC_PER_MONTH },
+		{ "msec",	USEC_PER_MSEC },
+		{ "ms",		USEC_PER_MSEC },
+		{ "m",		USEC_PER_MINUTE },
+		{ "hours",	USEC_PER_HOUR },
+		{ "hour",	USEC_PER_HOUR },
+		{ "hr",		USEC_PER_HOUR },
+		{ "h",		USEC_PER_HOUR },
+		{ "days",	USEC_PER_DAY },
+		{ "day",	USEC_PER_DAY },
+		{ "d",		USEC_PER_DAY },
+		{ "weeks",	USEC_PER_WEEK },
+		{ "week",	USEC_PER_WEEK },
+		{ "w",		USEC_PER_WEEK },
+		{ "years",	USEC_PER_YEAR },
+		{ "year",	USEC_PER_YEAR },
+		{ "y",		USEC_PER_YEAR },
+		{ "usec",	1ULL },
+		{ "us",		1ULL },
+		{ "",		USEC_PER_SEC },	/* default is sec */
+	};
+
+	const char *p;
+	usec_t r = 0;
+	int something = FALSE;
+
+	assert(t);
+	assert(usec);
+
+	p = t;
+	for (;;) {
+		long long l, z = 0;
+		char *e;
+		unsigned i, n = 0;
+
+		p += strspn(p, WHITESPACE);
+
+		if (*p == 0) {
+			if (!something)
+				return -EINVAL;
+
+			break;
+		}
+
+		errno = 0;
+		l = strtoll(p, &e, 10);
+
+		if (errno > 0)
+			return -errno;
+
+		if (l < 0)
+			return -ERANGE;
+
+		if (*e == '.') {
+			char *b = e + 1;
+
+			errno = 0;
+			z = strtoll(b, &e, 10);
+			if (errno > 0)
+				return -errno;
+
+			if (z < 0)
+				return -ERANGE;
+
+			if (e == b)
+				return -EINVAL;
+
+			n = e - b;
+
+		} else if (e == p)
+			return -EINVAL;
+
+		e += strspn(e, WHITESPACE);
+
+		for (i = 0; i < ARRAY_SIZE(table); i++)
+			if (startswith(e, table[i].suffix)) {
+				usec_t k = (usec_t) z * table[i].usec;
+
+				for (; n > 0; n--)
+					k /= 10;
+
+				r += (usec_t) l *table[i].usec + k;
+				p = e + strlen(table[i].suffix);
+
+				something = TRUE;
+				break;
+			}
+
+		if (i >= ARRAY_SIZE(table))
+			return -EINVAL;
+
+	}
+
+	*usec = r;
+
+	return 0;
+}
+
+int parse_timestamp(const char *t, usec_t *usec)
+{
+	static const struct {
+		const char *name;
+		const int nr;
+	} day_nr[] = {
+		{ "Sunday",	0 },
+		{ "Sun",	0 },
+		{ "Monday",	1 },
+		{ "Mon",	1 },
+		{ "Tuesday",	2 },
+		{ "Tue",	2 },
+		{ "Wednesday",	3 },
+		{ "Wed",	3 },
+		{ "Thursday",	4 },
+		{ "Thu",	4 },
+		{ "Friday",	5 },
+		{ "Fri",	5 },
+		{ "Saturday",	6 },
+		{ "Sat",	6 },
+	};
+
+	const char *k;
+	struct tm tm, copy;
+	time_t x;
+	usec_t plus = 0, minus = 0, ret;
+	int r, weekday = -1;
+	unsigned i;
+
+	/*
+	 * Allowed syntaxes:
+	 *
+	 *   2012-09-22 16:34:22
+	 *   2012-09-22T16:34:22
+	 *   2012-09-22 16:34	  (seconds will be set to 0)
+	 *   2012-09-22		  (time will be set to 00:00:00)
+	 *   16:34:22		  (date will be set to today)
+	 *   16:34		  (date will be set to today, seconds to 0)
+	 *   now
+	 *   yesterday		  (time is set to 00:00:00)
+	 *   today		  (time is set to 00:00:00)
+	 *   tomorrow		  (time is set to 00:00:00)
+	 *   +5min
+	 *   -5days
+	 *
+	 */
+
+	assert(t);
+	assert(usec);
+
+	x = time(NULL);
+	localtime_r(&x, &tm);
+	tm.tm_isdst = -1;
+
+	if (streq(t, "now"))
+		goto finish;
+
+	else if (streq(t, "today")) {
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+
+	} else if (streq(t, "yesterday")) {
+		tm.tm_mday--;
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+
+	} else if (streq(t, "tomorrow")) {
+		tm.tm_mday++;
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+
+	} else if (t[0] == '+') {
+
+		r = parse_sec(t + 1, &plus);
+		if (r < 0)
+			return r;
+
+		goto finish;
+	} else if (t[0] == '-') {
+
+		r = parse_sec(t + 1, &minus);
+		if (r < 0)
+			return r;
+
+		goto finish;
+
+	} else if (endswith(t, " ago")) {
+		char *z;
+
+		z = strndup(t, strlen(t) - 4);
+		if (!z)
+			return -ENOMEM;
+
+		r = parse_sec(z, &minus);
+		free(z);
+		if (r < 0)
+			return r;
+
+		goto finish;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(day_nr); i++) {
+		size_t skip;
+
+		if (!startswith_no_case(t, day_nr[i].name))
+			continue;
+
+		skip = strlen(day_nr[i].name);
+		if (t[skip] != ' ')
+			continue;
+
+		weekday = day_nr[i].nr;
+		t += skip + 1;
+		break;
+	}
+
+	copy = tm;
+	k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%dT%H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%y-%m-%d %H:%M", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%d %H:%M", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%y-%m-%d", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%d", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%H:%M", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%Y%m%d%H%M%S", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = 0;
+		goto finish;
+	}
+
+	return -EINVAL;
+
+ finish:
+	x = mktime(&tm);
+	if (x == (time_t)-1)
+		return -EINVAL;
+
+	if (weekday >= 0 && tm.tm_wday != weekday)
+		return -EINVAL;
+
+	ret = (usec_t) x *USEC_PER_SEC;
+
+	ret += plus;
+	if (ret > minus)
+		ret -= minus;
+	else
+		ret = 0;
+
+	*usec = ret;
+
+	return 0;
+}
+
+/* Returns the difference in seconds between its argument and GMT. If if TP is
+ * invalid or no DST information is available default to UTC, that is, zero.
+ * tzset is called so, for example, 'TZ="UTC" hwclock' will work as expected.
+ * Derived from glibc/time/strftime_l.c
+ */
+int get_gmtoff(const struct tm *tp)
+{
+	if (tp->tm_isdst < 0)
+		return 0;
+
+#if HAVE_TM_GMTOFF
+	return tp->tm_gmtoff;
+#else
+	struct tm tm;
+	struct tm gtm;
+	struct tm ltm = *tp;
+	time_t lt;
+
+	tzset();
+	lt = mktime(&ltm);
+	/* Check if mktime returning -1 is an error or a valid time_t */
+	if (lt == (time_t) -1) {
+		if (! localtime_r(&lt, &tm)
+			|| ((ltm.tm_sec ^ tm.tm_sec)
+			    | (ltm.tm_min ^ tm.tm_min)
+			    | (ltm.tm_hour ^ tm.tm_hour)
+			    | (ltm.tm_mday ^ tm.tm_mday)
+			    | (ltm.tm_mon ^ tm.tm_mon)
+			    | (ltm.tm_year ^ tm.tm_year)))
+			return 0;
+	}
+
+	if (! gmtime_r(&lt, &gtm))
+		return 0;
+
+	/* Calculate the GMT offset, that is, the difference between the
+	 * TP argument (ltm) and GMT (gtm).
+	 *
+	 * Compute intervening leap days correctly even if year is negative.
+	 * Take care to avoid int overflow in leap day calculations, but it's OK
+	 * to assume that A and B are close to each other.
+	 */
+	int a4 = (ltm.tm_year >> 2) + (1900 >> 2) - ! (ltm.tm_year & 3);
+	int b4 = (gtm.tm_year >> 2) + (1900 >> 2) - ! (gtm.tm_year & 3);
+	int a100 = a4 / 25 - (a4 % 25 < 0);
+	int b100 = b4 / 25 - (b4 % 25 < 0);
+	int a400 = a100 >> 2;
+	int b400 = b100 >> 2;
+	int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
+
+	int years = ltm.tm_year - gtm.tm_year;
+	int days = (365 * years + intervening_leap_days
+		    + (ltm.tm_yday - gtm.tm_yday));
+
+	return (60 * (60 * (24 * days + (ltm.tm_hour - gtm.tm_hour))
+		+ (ltm.tm_min - gtm.tm_min)) + (ltm.tm_sec - gtm.tm_sec));
+#endif
+}
+
+static int format_iso_time(struct tm *tm, suseconds_t usec, int flags, char *buf, size_t bufsz)
+{
+	char *p = buf;
+	int len;
+
+	if (flags & ISO_DATE) {
+		len = snprintf(p, bufsz, "%4ld-%.2d-%.2d",
+			       tm->tm_year + (long) 1900,
+			       tm->tm_mon + 1, tm->tm_mday);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+	}
+
+	if ((flags & ISO_DATE) && (flags & ISO_TIME)) {
+		if (bufsz < 1)
+			goto err;
+		*p++ = (flags & ISO_T) ? 'T' : ' ';
+		bufsz--;
+	}
+
+	if (flags & ISO_TIME) {
+		len = snprintf(p, bufsz, "%02d:%02d:%02d", tm->tm_hour,
+			       tm->tm_min, tm->tm_sec);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+	}
+
+	if (flags & ISO_DOTUSEC) {
+		len = snprintf(p, bufsz, ".%06ld", (long) usec);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+
+	} else if (flags & ISO_COMMAUSEC) {
+		len = snprintf(p, bufsz, ",%06ld", (long) usec);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+	}
+
+	if (flags & ISO_TIMEZONE) {
+		int tmin  = get_gmtoff(tm) / 60;
+		int zhour = tmin / 60;
+		int zmin  = abs(tmin % 60);
+		len = snprintf(p, bufsz, "%+03d:%02d", zhour,zmin);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+	}
+	return 0;
+ err:
+	warnx(_("format_iso_time: buffer overflow."));
+	return -1;
+}
+
+/* timeval to ISO 8601 */
+int strtimeval_iso(struct timeval *tv, int flags, char *buf, size_t bufsz)
+{
+	struct tm tm;
+	struct tm *rc;
+
+	if (flags & ISO_GMTIME)
+		rc = gmtime_r(&tv->tv_sec, &tm);
+	else
+		rc = localtime_r(&tv->tv_sec, &tm);
+
+	if (rc)
+		return format_iso_time(&tm, tv->tv_usec, flags, buf, bufsz);
+
+	warnx(_("time %ld is out of range."), tv->tv_sec);
+	return -1;
+}
+
+/* struct tm to ISO 8601 */
+int strtm_iso(struct tm *tm, int flags, char *buf, size_t bufsz)
+{
+	return format_iso_time(tm, 0, flags, buf, bufsz);
+}
+
+/* time_t to ISO 8601 */
+int strtime_iso(const time_t *t, int flags, char *buf, size_t bufsz)
+{
+	struct tm tm;
+	struct tm *rc;
+
+	if (flags & ISO_GMTIME)
+		rc = gmtime_r(t, &tm);
+	else
+		rc = localtime_r(t, &tm);
+
+	if (rc)
+		return format_iso_time(&tm, 0, flags, buf, bufsz);
+
+	warnx(_("time %ld is out of range."), (long)t);
+	return -1;
+}
+
+/* relative time functions */
+static inline int time_is_thisyear(struct tm const *const tm,
+				   struct tm const *const tmnow)
+{
+	return tm->tm_year == tmnow->tm_year;
+}
+
+static inline int time_is_today(struct tm const *const tm,
+				struct tm const *const tmnow)
+{
+	return (tm->tm_yday == tmnow->tm_yday &&
+		time_is_thisyear(tm, tmnow));
+}
+
+int strtime_short(const time_t *t, struct timeval *now, int flags, char *buf, size_t bufsz)
+{
+	struct tm tm, tmnow;
+	int rc = 0;
+
+	if (now->tv_sec == 0)
+		gettimeofday(now, NULL);
+
+	localtime_r(t, &tm);
+	localtime_r(&now->tv_sec, &tmnow);
+
+	if (time_is_today(&tm, &tmnow)) {
+		rc = snprintf(buf, bufsz, "%02d:%02d", tm.tm_hour, tm.tm_min);
+		if (rc < 0 || (size_t) rc > bufsz)
+			return -1;
+		rc = 1;
+
+	} else if (time_is_thisyear(&tm, &tmnow)) {
+		if (flags & UL_SHORTTIME_THISYEAR_HHMM)
+			rc = strftime(buf, bufsz, "%b%d/%H:%M", &tm);
+		else
+			rc = strftime(buf, bufsz, "%b%d", &tm);
+	} else
+		rc = strftime(buf, bufsz, "%Y-%b%d", &tm);
+
+	return rc <= 0 ? -1 : 0;
+}
+
+#ifndef HAVE_TIMEGM
+time_t timegm(struct tm *tm)
+{
+	const char *zone = getenv("TZ");
+	time_t ret;
+
+	setenv("TZ", "", 1);
+	tzset();
+	ret = mktime(tm);
+	if (zone)
+		setenv("TZ", zone, 1);
+	else
+		unsetenv("TZ");
+	tzset();
+	return ret;
+}
+#endif /* HAVE_TIMEGM */
+
+#ifdef TEST_PROGRAM_TIMEUTILS
+
+int main(int argc, char *argv[])
+{
+	struct timeval tv = { 0 };
+	char buf[ISO_BUFSIZ];
+
+	if (argc < 2) {
+		fprintf(stderr, "usage: %s [<time> [<usec>]] | [--timestamp <str>]\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	if (strcmp(argv[1], "--timestamp") == 0) {
+		usec_t usec;
+
+		parse_timestamp(argv[2], &usec);
+		tv.tv_sec = (time_t) (usec / 1000000);
+		tv.tv_usec = usec % 1000000;
+	} else {
+		tv.tv_sec = strtos64_or_err(argv[1], "failed to parse <time>");
+		if (argc == 3)
+			tv.tv_usec = strtos64_or_err(argv[2], "failed to parse <usec>");
+	}
+
+	strtimeval_iso(&tv, ISO_DATE, buf, sizeof(buf));
+	printf("Date: '%s'\n", buf);
+
+	strtimeval_iso(&tv, ISO_TIME, buf, sizeof(buf));
+	printf("Time: '%s'\n", buf);
+
+	strtimeval_iso(&tv, ISO_DATE | ISO_TIME | ISO_COMMAUSEC | ISO_T,
+		       buf, sizeof(buf));
+	printf("Full: '%s'\n", buf);
+
+	strtimeval_iso(&tv, ISO_TIMESTAMP_DOT, buf, sizeof(buf));
+	printf("Zone: '%s'\n", buf);
+
+	return EXIT_SUCCESS;
+}
+
+#endif /* TEST_PROGRAM_TIMEUTILS */