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 */
6
7 #include <errno.h>
8 #include "fido.h"
9
10 static int
timespec_to_ms(const struct timespec * ts)11 timespec_to_ms(const struct timespec *ts)
12 {
13 int64_t x, y;
14
15 if (ts->tv_sec < 0 || ts->tv_nsec < 0 ||
16 ts->tv_nsec >= 1000000000LL)
17 return -1;
18
19 if ((uint64_t)ts->tv_sec >= INT64_MAX / 1000LL)
20 return -1;
21
22 x = ts->tv_sec * 1000LL;
23 y = ts->tv_nsec / 1000000LL;
24
25 if (INT64_MAX - x < y || x + y > INT_MAX)
26 return -1;
27
28 return (int)(x + y);
29 }
30
31 int
fido_time_now(struct timespec * ts_now)32 fido_time_now(struct timespec *ts_now)
33 {
34 if (clock_gettime(CLOCK_MONOTONIC, ts_now) != 0) {
35 fido_log_error(errno, "%s: clock_gettime", __func__);
36 return -1;
37 }
38
39 return 0;
40 }
41
42 int
fido_time_delta(const struct timespec * ts_start,int * ms_remain)43 fido_time_delta(const struct timespec *ts_start, int *ms_remain)
44 {
45 struct timespec ts_end, ts_delta;
46 int ms;
47
48 if (*ms_remain < 0)
49 return 0;
50
51 if (clock_gettime(CLOCK_MONOTONIC, &ts_end) != 0) {
52 fido_log_error(errno, "%s: clock_gettime", __func__);
53 return -1;
54 }
55
56 if (timespeccmp(&ts_end, ts_start, <)) {
57 fido_log_debug("%s: timespeccmp", __func__);
58 return -1;
59 }
60
61 timespecsub(&ts_end, ts_start, &ts_delta);
62
63 if ((ms = timespec_to_ms(&ts_delta)) < 0) {
64 fido_log_debug("%s: timespec_to_ms", __func__);
65 return -1;
66 }
67
68 if (ms > *ms_remain)
69 ms = *ms_remain;
70
71 *ms_remain -= ms;
72
73 return 0;
74 }
75