/***
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 <string.h>
#include <sys/sysinfo.h>
#include <sys/time.h>
#include <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
* 2012-09-22 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-%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;
}
