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time-util.c
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time-util.c
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/*
*
* Copyright (c) 2012-2015 Lennart Poettering,
* 2014-2023 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>,
* 2022-2023 Yu Watanabe
*
* pam_session_timelimit 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 3 of the
* License, or (at your option) any later version.
*
* pam_session_timelimit 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include "time-util.h"
/* What is interpreted as whitespace? */
#define WHITESPACE " \t\n\r"
#define DIGITS "0123456789"
#define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
#define ELEMENTSOF(x) \
(__builtin_choose_expr( \
!__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
sizeof(x)/sizeof((x)[0]), \
((void)0)))
static char *startswith(const char *s, const char *prefix) {
size_t l;
assert(s);
assert(prefix);
l = strlen(prefix);
if (!strneq(s, prefix, l))
return NULL;
return (char*) s + l;
}
static const char* extract_multiplier(const char *p, usec_t *ret) {
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 },
{ "M", 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 },
{ "µs", 1ULL },
};
assert(p);
assert(ret);
for (size_t i = 0; i < ELEMENTSOF(table); i++) {
char *e;
e = startswith(p, table[i].suffix);
if (e) {
*ret = table[i].usec;
return e;
}
}
return p;
}
int parse_time(const char *t, usec_t *usec, usec_t default_unit) {
const char *p, *s;
usec_t r = 0;
bool something = false;
assert(t);
assert(default_unit > 0);
p = t;
p += strspn(p, WHITESPACE);
s = startswith(p, "infinity");
if (s) {
s += strspn(s, WHITESPACE);
if (*s != 0)
return -EINVAL;
if (usec)
*usec = USEC_INFINITY;
return 0;
}
for (;;) {
usec_t multiplier = default_unit, k;
long long l;
char *e;
p += strspn(p, WHITESPACE);
if (*p == 0) {
if (!something)
return -EINVAL;
break;
}
if (*p == '-') /* Don't allow "-0" */
return -ERANGE;
errno = 0;
l = strtoll(p, &e, 10);
if (errno > 0)
return -errno;
if (l < 0)
return -ERANGE;
if (*e == '.') {
p = e + 1;
p += strspn(p, DIGITS);
} else if (e == p)
return -EINVAL;
else
p = e;
s = extract_multiplier(p + strspn(p, WHITESPACE), &multiplier);
if (s == p && *s != '\0')
/* Don't allow '12.34.56', but accept '12.34 .56' or '12.34s.56' */
return -EINVAL;
p = s;
if ((usec_t) l >= USEC_INFINITY / multiplier)
return -ERANGE;
k = (usec_t) l * multiplier;
if (k >= USEC_INFINITY - r)
return -ERANGE;
r += k;
something = true;
if (*e == '.') {
usec_t m = multiplier / 10;
const char *b;
for (b = e + 1; *b >= '0' && *b <= '9'; b++, m /= 10) {
k = (usec_t) (*b - '0') * m;
if (k >= USEC_INFINITY - r)
return -ERANGE;
r += k;
}
/* Don't allow "0.-0", "3.+1", "3. 1", "3.sec" or "3.hoge" */
if (b == e + 1)
return -EINVAL;
}
}
if (usec)
*usec = r;
return 0;
}
char* format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
static const struct {
const char *suffix;
usec_t usec;
} table[] = {
{ "y", USEC_PER_YEAR },
{ "month", USEC_PER_MONTH },
{ "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 },
};
char *p = buf;
bool something = false;
if (!p)
return NULL;
assert(l > 0);
if (t == USEC_INFINITY) {
strncpy(p, "infinity", l-1);
p[l-1] = 0;
return p;
}
if (t <= 0) {
strncpy(p, "0", l-1);
p[l-1] = 0;
return p;
}
/* The result of this function can be parsed with parse_sec */
for (size_t i = 0; i < ELEMENTSOF(table); i++) {
int k = 0;
size_t n;
bool done = false;
usec_t a, b;
if (t <= 0)
break;
if (t < accuracy && something)
break;
if (t < table[i].usec)
continue;
if (l <= 1)
break;
a = t / table[i].usec;
b = t % table[i].usec;
/* Let's see if we should shows this in dot notation */
if (t < USEC_PER_MINUTE && b > 0) {
signed char j = 0;
for (usec_t cc = table[i].usec; cc > 1; cc /= 10)
j++;
for (usec_t cc = accuracy; cc > 1; cc /= 10) {
b /= 10;
j--;
}
if (j > 0) {
k = snprintf(p, l,
"%s"USEC_FMT".%0*"PRI_USEC"%s",
p > buf ? " " : "",
a,
j,
b,
table[i].suffix);
t = 0;
done = true;
}
}
/* No? Then let's show it normally */
if (!done) {
k = snprintf(p, l,
"%s"USEC_FMT"%s",
p > buf ? " " : "",
a,
table[i].suffix);
t = b;
}
n = MIN((size_t) k, l-1);
l -= n;
p += n;
something = true;
}
*p = 0;
return buf;
}