4.115
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1 | /** |
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2 | * @file score/src/timespecsubtract.c |
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3 | */ |
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4 | |
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5 | /* |
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6 | * COPYRIGHT (c) 1989-2007. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #if HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #include <rtems/system.h> |
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21 | #include <sys/types.h> |
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22 | #include <rtems/score/timespec.h> |
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23 | #include <rtems/score/tod.h> |
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24 | #include <rtems/score/watchdog.h> |
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25 | |
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26 | void _Timespec_Subtract( |
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27 | const struct timespec *start, |
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28 | const struct timespec *end, |
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29 | struct timespec *result |
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30 | ) |
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31 | { |
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32 | |
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33 | if (end->tv_nsec < start->tv_nsec) { |
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34 | result->tv_sec = end->tv_sec - start->tv_sec - 1; |
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35 | result->tv_nsec = |
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36 | (TOD_NANOSECONDS_PER_SECOND - start->tv_nsec) + end->tv_nsec; |
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37 | } else { |
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38 | result->tv_sec = end->tv_sec - start->tv_sec; |
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39 | result->tv_nsec = end->tv_nsec - start->tv_nsec; |
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40 | } |
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41 | } |
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