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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: time.c,v 1.12 2020/02/16 21:07:33 florian Exp $ */
/*! \file */
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <time.h>
#include <sys/time.h> /* Required for struct timeval on some platforms. */
#include <string.h>
#include <isc/time.h>
#include <isc/util.h>
#define NS_PER_S 1000000000 /*%< Nanoseconds per second. */
#define NS_PER_US 1000 /*%< Nanoseconds per microsecond. */
/*
* All of the INSIST()s checks of nanoseconds < NS_PER_S are for
* consistency checking of the type. In lieu of magic numbers, it
* is the best we've got. The check is only performed on functions which
* need an initialized type.
*/
/***
*** Absolute Times
***/
isc_result_t
isc_time_now(struct timespec *t) {
REQUIRE(t != NULL);
if (clock_gettime(CLOCK_REALTIME, t) == -1) {
UNEXPECTED_ERROR(__FILE__, __LINE__, "%s", strerror(errno));
return (ISC_R_UNEXPECTED);
}
return (ISC_R_SUCCESS);
}
int
isc_time_compare(const struct timespec *t1, const struct timespec *t2) {
REQUIRE(t1 != NULL && t2 != NULL);
INSIST(t1->tv_nsec < NS_PER_S && t2->tv_nsec < NS_PER_S);
if (t1->tv_sec < t2->tv_sec)
return (-1);
if (t1->tv_sec > t2->tv_sec)
return (1);
if (t1->tv_nsec < t2->tv_nsec)
return (-1);
if (t1->tv_nsec > t2->tv_nsec)
return (1);
return (0);
}
isc_result_t
isc_time_add(const struct timespec *t, const struct timespec *i, struct timespec *result)
{
REQUIRE(t != NULL && i != NULL && result != NULL);
INSIST(t->tv_nsec < NS_PER_S && i->tv_nsec < NS_PER_S);
timespecadd(t, i, result);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_time_subtract(const struct timespec *t, const struct timespec *i,
struct timespec *result)
{
REQUIRE(t != NULL && i != NULL && result != NULL);
INSIST(t->tv_nsec < NS_PER_S && i->tv_nsec < NS_PER_S);
timespecsub(t, i, result);
return (ISC_R_SUCCESS);
}
uint64_t
isc_time_microdiff(const struct timespec *t1, const struct timespec *t2) {
struct timespec res;
REQUIRE(t1 != NULL && t2 != NULL);
timespecsub(t1, t2, &res);
if (res.tv_sec < 0)
return 0;
return ((res.tv_sec * NS_PER_S + res.tv_nsec) / NS_PER_US);
}
void
isc_time_formattimestamp(const struct timespec *t, char *buf, unsigned int len) {
unsigned int flen;
REQUIRE(t != NULL);
INSIST(t->tv_nsec < NS_PER_S);
REQUIRE(buf != NULL);
REQUIRE(len > 0);
flen = strftime(buf, len, "%d-%b-%Y %X", localtime(&t->tv_sec));
INSIST(flen < len);
if (flen != 0) {
snprintf(buf + flen, len - flen,
".%03ld", t->tv_nsec / 1000000);
} else {
strlcpy(buf, "99-Bad-9999 99:99:99.999", len);
}
}
void
isc_time_formathttptimestamp(const struct timespec *t, char *buf, unsigned int len) {
unsigned int flen;
REQUIRE(t != NULL);
INSIST(t->tv_nsec < NS_PER_S);
REQUIRE(buf != NULL);
REQUIRE(len > 0);
/*
* 5 spaces, 1 comma, 3 GMT, 2 %d, 4 %Y, 8 %H:%M:%S, 3+ %a, 3+ %b (29+)
*/
flen = strftime(buf, len, "%a, %d %b %Y %H:%M:%S GMT",
gmtime(&t->tv_sec));
INSIST(flen < len);
}
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