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Systemd/src/shared/time-util.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <time.h>
#include <string.h>
#include "util.h"
#include "time-util.h"
usec_t now(clockid_t clock_id) {
struct timespec ts;
assert_se(clock_gettime(clock_id, &ts) == 0);
return timespec_load(&ts);
}
dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
assert(ts);
ts->realtime = now(CLOCK_REALTIME);
ts->monotonic = now(CLOCK_MONOTONIC);
return ts;
}
dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
int64_t delta;
assert(ts);
ts->realtime = u;
if (u == 0)
ts->monotonic = 0;
else {
delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
ts->monotonic = now(CLOCK_MONOTONIC);
if ((int64_t) ts->monotonic > delta)
ts->monotonic -= delta;
else
ts->monotonic = 0;
}
return ts;
}
usec_t timespec_load(const struct timespec *ts) {
assert(ts);
if (ts->tv_sec == (time_t) -1 &&
ts->tv_nsec == (long) -1)
return (usec_t) -1;
if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC)
return (usec_t) -1;
return
(usec_t) ts->tv_sec * USEC_PER_SEC +
(usec_t) ts->tv_nsec / NSEC_PER_USEC;
}
struct timespec *timespec_store(struct timespec *ts, usec_t u) {
assert(ts);
if (u == (usec_t) -1) {
ts->tv_sec = (time_t) -1;
ts->tv_nsec = (long) -1;
return ts;
}
ts->tv_sec = (time_t) (u / USEC_PER_SEC);
ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
return ts;
}
usec_t timeval_load(const struct timeval *tv) {
assert(tv);
if (tv->tv_sec == (time_t) -1 &&
tv->tv_usec == (suseconds_t) -1)
return (usec_t) -1;
if ((usec_t) tv->tv_sec > (UINT64_MAX - tv->tv_usec) / USEC_PER_SEC)
return (usec_t) -1;
return
(usec_t) tv->tv_sec * USEC_PER_SEC +
(usec_t) tv->tv_usec;
}
struct timeval *timeval_store(struct timeval *tv, usec_t u) {
assert(tv);
if (u == (usec_t) -1) {
tv->tv_sec = (time_t) -1;
tv->tv_usec = (suseconds_t) -1;
return tv;
}
tv->tv_sec = (time_t) (u / USEC_PER_SEC);
tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
return tv;
}
char *format_timestamp(char *buf, size_t l, usec_t t) {
struct tm tm;
time_t sec;
assert(buf);
assert(l > 0);
if (t <= 0)
return NULL;
sec = (time_t) (t / USEC_PER_SEC);
if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", localtime_r(&sec, &tm)) <= 0)
return NULL;
return buf;
}
char *format_timestamp_relative(char *buf, size_t l, usec_t t) {
usec_t n, d;
n = now(CLOCK_REALTIME);
if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t)
return NULL;
d = n - t;
if (d >= USEC_PER_YEAR)
snprintf(buf, l, "%llu years %llu months ago",
(unsigned long long) (d / USEC_PER_YEAR),
(unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH));
else if (d >= USEC_PER_MONTH)
snprintf(buf, l, "%llu months %llu days ago",
(unsigned long long) (d / USEC_PER_MONTH),
(unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY));
else if (d >= USEC_PER_WEEK)
snprintf(buf, l, "%llu weeks %llu days ago",
(unsigned long long) (d / USEC_PER_WEEK),
(unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY));
else if (d >= 2*USEC_PER_DAY)
snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY));
else if (d >= 25*USEC_PER_HOUR)
snprintf(buf, l, "1 day %lluh ago",
(unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR));
else if (d >= 6*USEC_PER_HOUR)
snprintf(buf, l, "%lluh ago",
(unsigned long long) (d / USEC_PER_HOUR));
else if (d >= USEC_PER_HOUR)
snprintf(buf, l, "%lluh %llumin ago",
(unsigned long long) (d / USEC_PER_HOUR),
(unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE));
else if (d >= 5*USEC_PER_MINUTE)
snprintf(buf, l, "%llumin ago",
(unsigned long long) (d / USEC_PER_MINUTE));
else if (d >= USEC_PER_MINUTE)
snprintf(buf, l, "%llumin %llus ago",
(unsigned long long) (d / USEC_PER_MINUTE),
(unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC));
else if (d >= USEC_PER_SEC)
snprintf(buf, l, "%llus ago",
(unsigned long long) (d / USEC_PER_SEC));
else if (d >= USEC_PER_MSEC)
snprintf(buf, l, "%llums ago",
(unsigned long long) (d / USEC_PER_MSEC));
else if (d > 0)
snprintf(buf, l, "%lluus ago",
(unsigned long long) d);
else
snprintf(buf, l, "now");
buf[l-1] = 0;
return buf;
}
char *format_timespan(char *buf, size_t l, usec_t t) {
static const struct {
const char *suffix;
usec_t usec;
} table[] = {
{ "w", USEC_PER_WEEK },
{ "d", USEC_PER_DAY },
{ "h", USEC_PER_HOUR },
{ "min", USEC_PER_MINUTE },
{ "s", USEC_PER_SEC },
{ "ms", USEC_PER_MSEC },
{ "us", 1 },
};
unsigned i;
char *p = buf;
assert(buf);
assert(l > 0);
if (t == (usec_t) -1)
return NULL;
if (t == 0) {
snprintf(p, l, "0");
p[l-1] = 0;
return p;
}
/* The result of this function can be parsed with parse_usec */
for (i = 0; i < ELEMENTSOF(table); i++) {
int k;
size_t n;
if (t < table[i].usec)
continue;
if (l <= 1)
break;
k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix);
n = MIN((size_t) k, l);
l -= n;
p += n;
t %= table[i].usec;
}
*p = 0;
return buf;
}
void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
assert(f);
assert(name);
assert(t);
if (!dual_timestamp_is_set(t))
return;
fprintf(f, "%s=%llu %llu\n",
name,
(unsigned long long) t->realtime,
(unsigned long long) t->monotonic);
}
void dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
unsigned long long a, b;
assert(value);
assert(t);
if (sscanf(value, "%lli %llu", &a, &b) != 2)
log_debug("Failed to parse finish timestamp value %s", value);
else {
t->realtime = a;
t->monotonic = b;
}
}
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
* 2012-09-22 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);
assert_se(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_usec(t+1, &plus);
if (r < 0)
return r;
goto finish;
} else if (t[0] == '-') {
r = parse_usec(t+1, &minus);
if (r < 0)
return r;
goto finish;
} else if (endswith(t, " ago")) {
_cleanup_free_ char *z;
z = strndup(t, strlen(t) - 4);
if (!z)
return -ENOMEM;
r = parse_usec(z, &minus);
if (r < 0)
return r;
goto finish;
}
for (i = 0; i < ELEMENTSOF(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-%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;
}
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;
}
int parse_usec(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;
assert(t);
assert(usec);
p = t;
do {
long long l;
char *e;
unsigned i;
errno = 0;
l = strtoll(p, &e, 10);
if (errno != 0)
return -errno;
if (l < 0)
return -ERANGE;
if (e == p)
return -EINVAL;
e += strspn(e, WHITESPACE);
for (i = 0; i < ELEMENTSOF(table); i++)
if (startswith(e, table[i].suffix)) {
r += (usec_t) l * table[i].usec;
p = e + strlen(table[i].suffix);
break;
}
if (i >= ELEMENTSOF(table))
return -EINVAL;
} while (*p != 0);
*usec = r;
return 0;
}
int parse_nsec(const char *t, nsec_t *nsec) {
static const struct {
const char *suffix;
nsec_t nsec;
} table[] = {
{ "seconds", NSEC_PER_SEC },
{ "second", NSEC_PER_SEC },
{ "sec", NSEC_PER_SEC },
{ "s", NSEC_PER_SEC },
{ "minutes", NSEC_PER_MINUTE },
{ "minute", NSEC_PER_MINUTE },
{ "min", NSEC_PER_MINUTE },
{ "months", NSEC_PER_MONTH },
{ "month", NSEC_PER_MONTH },
{ "msec", NSEC_PER_MSEC },
{ "ms", NSEC_PER_MSEC },
{ "m", NSEC_PER_MINUTE },
{ "hours", NSEC_PER_HOUR },
{ "hour", NSEC_PER_HOUR },
{ "hr", NSEC_PER_HOUR },
{ "h", NSEC_PER_HOUR },
{ "days", NSEC_PER_DAY },
{ "day", NSEC_PER_DAY },
{ "d", NSEC_PER_DAY },
{ "weeks", NSEC_PER_WEEK },
{ "week", NSEC_PER_WEEK },
{ "w", NSEC_PER_WEEK },
{ "years", NSEC_PER_YEAR },
{ "year", NSEC_PER_YEAR },
{ "y", NSEC_PER_YEAR },
{ "usec", NSEC_PER_USEC },
{ "us", NSEC_PER_USEC },
{ "nsec", 1ULL },
{ "ns", 1ULL },
{ "", 1ULL }, /* default is nsec */
};
const char *p;
nsec_t r = 0;
assert(t);
assert(nsec);
p = t;
do {
long long l;
char *e;
unsigned i;
errno = 0;
l = strtoll(p, &e, 10);
if (errno != 0)
return -errno;
if (l < 0)
return -ERANGE;
if (e == p)
return -EINVAL;
e += strspn(e, WHITESPACE);
for (i = 0; i < ELEMENTSOF(table); i++)
if (startswith(e, table[i].suffix)) {
r += (nsec_t) l * table[i].nsec;
p = e + strlen(table[i].suffix);
break;
}
if (i >= ELEMENTSOF(table))
return -EINVAL;
} while (*p != 0);
*nsec = r;
return 0;
}
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