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436a604b | 1 | /* Convert double to timespec. |
dff8da6b | 2 | Copyright (C) 2011-2024 Free Software Foundation, Inc. |
436a604b AY |
3 | This file is part of the GNU C Library and is also part of gnulib. |
4 | Patches to this file should be submitted to both projects. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | /* Convert the double value SEC to a struct timespec. Round toward | |
21 | positive infinity. On overflow, return an extremal value. */ | |
22 | ||
23 | #include <support/timespec.h> | |
24 | #include <intprops.h> | |
25 | ||
26 | struct timespec | |
27 | dtotimespec (double sec) | |
28 | { | |
29 | if (sec <= TYPE_MINIMUM (time_t)) | |
30 | return make_timespec (TYPE_MINIMUM (time_t), 0); | |
31 | else if (sec >= 1.0 + TYPE_MAXIMUM (time_t)) | |
32 | return make_timespec (TYPE_MAXIMUM (time_t), TIMESPEC_HZ - 1); | |
33 | else | |
34 | { | |
35 | time_t s = sec; | |
36 | double frac = TIMESPEC_HZ * (sec - s); | |
37 | long ns = frac; | |
38 | ns += ns < frac; | |
39 | s += ns / TIMESPEC_HZ; | |
40 | ns %= TIMESPEC_HZ; | |
41 | ||
42 | if (ns < 0) | |
43 | { | |
44 | s--; | |
45 | ns += TIMESPEC_HZ; | |
46 | } | |
47 | ||
48 | return make_timespec (s, ns); | |
49 | } | |
50 | } |