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51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
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/* Convert double to timespec.
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Copyright (C) 2011-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library and is also part of gnulib.
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Patches to this file should be submitted to both projects.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Convert the double value SEC to a struct timespec. Round toward
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positive infinity. On overflow, return an extremal value. */
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#include <support/timespec.h>
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#include <intprops.h>
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struct timespec
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dtotimespec (double sec)
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{
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if (sec <= TYPE_MINIMUM (time_t))
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return make_timespec (TYPE_MINIMUM (time_t), 0);
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else if (sec >= 1.0 + TYPE_MAXIMUM (time_t))
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return make_timespec (TYPE_MAXIMUM (time_t), TIMESPEC_HZ - 1);
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else
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{
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time_t s = sec;
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double frac = TIMESPEC_HZ * (sec - s);
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long ns = frac;
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ns += ns < frac;
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s += ns / TIMESPEC_HZ;
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ns %= TIMESPEC_HZ;
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if (ns < 0)
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{
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s--;
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ns += TIMESPEC_HZ;
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}
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return make_timespec (s, ns);
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}
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}
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