1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief TOD to Seconds |
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5 | * @ingroup ClassicClock |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/rtems/clock.h> |
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22 | #include <rtems/score/todimpl.h> |
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23 | |
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24 | #define TOD_SECONDS_AT_2100_03_01_00_00 4107538800UL |
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25 | |
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26 | /* |
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27 | * The following array contains the number of days in all months |
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28 | * up to the month indicated by the index of the second dimension. |
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29 | * The first dimension should be 1 for leap years, and 0 otherwise. |
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30 | */ |
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31 | const uint16_t _TOD_Days_to_date[2][13] = { |
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32 | { 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }, |
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33 | { 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 } |
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34 | }; |
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35 | |
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36 | /* |
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37 | * The following array contains the number of days in the years |
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38 | * since the last leap year. The index should be 0 for leap |
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39 | * years, and the number of years since the beginning of a leap |
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40 | * year otherwise. |
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41 | */ |
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42 | const uint16_t _TOD_Days_since_last_leap_year[4] = { 0, 366, 731, 1096 }; |
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43 | |
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44 | |
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45 | uint32_t _TOD_To_seconds( |
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46 | const rtems_time_of_day *the_tod |
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47 | ) |
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48 | { |
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49 | uint32_t time; |
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50 | uint32_t year_mod_4; |
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51 | |
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52 | time = the_tod->day - 1; |
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53 | year_mod_4 = the_tod->year & 3; |
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54 | |
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55 | if ( year_mod_4 == 0 ) |
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56 | time += _TOD_Days_to_date[ 1 ][ the_tod->month ]; |
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57 | else |
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58 | time += _TOD_Days_to_date[ 0 ][ the_tod->month ]; |
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59 | |
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60 | time += ( (the_tod->year - TOD_BASE_YEAR) / 4 ) * |
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61 | ( (TOD_DAYS_PER_YEAR * 4) + 1); |
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62 | |
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63 | time += _TOD_Days_since_last_leap_year[ year_mod_4 ]; |
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64 | |
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65 | time *= TOD_SECONDS_PER_DAY; |
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66 | |
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67 | time += ((the_tod->hour * TOD_MINUTES_PER_HOUR) + the_tod->minute) |
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68 | * TOD_SECONDS_PER_MINUTE; |
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69 | |
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70 | time += the_tod->second; |
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71 | |
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72 | /* The year 2100 is not a leap year */ |
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73 | if ( time |
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74 | >= (TOD_SECONDS_AT_2100_03_01_00_00 - TOD_SECONDS_1970_THROUGH_1988)) { |
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75 | time -= TOD_SECONDS_PER_DAY; |
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76 | } |
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77 | |
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78 | time += TOD_SECONDS_1970_THROUGH_1988; |
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79 | |
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80 | return( time ); |
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81 | } |
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