1/*
2 * Copyright (c) 2021 Yubico AB. All rights reserved.
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8#include <errno.h>
9#include "fido.h"
10
11static int
12timespec_to_ms(const struct timespec *ts)
13{
14	int64_t x, y;
15
16	if (ts->tv_sec < 0 || ts->tv_nsec < 0 ||
17	    ts->tv_nsec >= 1000000000LL)
18		return -1;
19
20	if ((uint64_t)ts->tv_sec >= INT64_MAX / 1000LL)
21		return -1;
22
23	x = ts->tv_sec * 1000LL;
24	y = ts->tv_nsec / 1000000LL;
25
26	if (INT64_MAX - x < y || x + y > INT_MAX)
27		return -1;
28
29	return (int)(x + y);
30}
31
32int
33fido_time_now(struct timespec *ts_now)
34{
35	if (clock_gettime(CLOCK_MONOTONIC, ts_now) != 0) {
36		fido_log_error(errno, "%s: clock_gettime", __func__);
37		return -1;
38	}
39
40	return 0;
41}
42
43int
44fido_time_delta(const struct timespec *ts_start, int *ms_remain)
45{
46	struct timespec ts_end, ts_delta;
47	int ms;
48
49	if (*ms_remain < 0)
50		return 0;
51
52	if (clock_gettime(CLOCK_MONOTONIC, &ts_end) != 0) {
53		fido_log_error(errno, "%s: clock_gettime", __func__);
54		return -1;
55	}
56
57	if (timespeccmp(&ts_end, ts_start, <)) {
58		fido_log_debug("%s: timespeccmp", __func__);
59		return -1;
60	}
61
62	timespecsub(&ts_end, ts_start, &ts_delta);
63
64	if ((ms = timespec_to_ms(&ts_delta)) < 0) {
65		fido_log_debug("%s: timespec_to_ms", __func__);
66		return -1;
67	}
68
69	if (ms > *ms_remain)
70		ms = *ms_remain;
71
72	*ms_remain -= ms;
73
74	return 0;
75}
76