1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Obtain Current Time of Day (Classic TOD) |
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5 | * @ingroup ClassicClock Clocks |
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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.org/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 | #include <rtems/config.h> |
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24 | |
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25 | #define RTEMS_SECS_PER_MINUTE (60UL) |
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26 | #define RTEMS_MINUTE_PER_HOUR (60UL) |
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27 | #define RTEMS_SECS_PER_HOUR (RTEMS_SECS_PER_MINUTE * RTEMS_MINUTE_PER_HOUR) |
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28 | #define RTEMS_HOURS_PER_DAY (24UL) |
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29 | #define RTEMS_SECS_PER_DAY (RTEMS_SECS_PER_HOUR * RTEMS_HOURS_PER_DAY) |
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30 | #define RTEMS_DAYS_PER_YEAR (365UL) |
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31 | #define RTEMS_YEAR_BASE (1970UL) |
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32 | |
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33 | extern const uint16_t _TOD_Days_to_date[2][13]; |
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34 | |
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35 | static bool _Leap_year( |
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36 | uint32_t year |
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37 | ) |
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38 | { |
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39 | return (((year % 4) == 0) && ((year % 100) != 0)) || ((year % 400) == 0); |
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40 | } |
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41 | |
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42 | static uint32_t _Leap_years_before( |
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43 | uint32_t year |
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44 | ) |
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45 | { |
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46 | year -= 1; |
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47 | return (year / 4) - (year / 100) + (year / 400); |
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48 | } |
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49 | |
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50 | static uint32_t _Leap_years_between( |
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51 | uint32_t from, uint32_t to |
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52 | ) |
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53 | { |
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54 | return _Leap_years_before( to ) - _Leap_years_before( from + 1 ); |
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55 | } |
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56 | |
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57 | static uint32_t _Year_day_as_month( |
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58 | uint32_t year, uint32_t *day |
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59 | ) |
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60 | { |
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61 | const uint16_t* days_to_date; |
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62 | uint32_t month = 0; |
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63 | |
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64 | if ( _Leap_year( year ) ) |
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65 | days_to_date = _TOD_Days_to_date[1]; |
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66 | else |
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67 | days_to_date = _TOD_Days_to_date[0]; |
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68 | |
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69 | days_to_date += 2; |
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70 | |
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71 | while (month < 11) { |
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72 | if (*day < *days_to_date) |
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73 | break; |
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74 | ++month; |
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75 | ++days_to_date; |
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76 | } |
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77 | |
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78 | *day -= *(days_to_date - 1); |
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79 | |
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80 | return month; |
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81 | } |
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82 | |
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83 | rtems_status_code rtems_clock_get_tod( |
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84 | rtems_time_of_day *time_buffer |
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85 | ) |
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86 | { |
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87 | struct timeval now; |
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88 | uint32_t days; |
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89 | uint32_t day_secs; |
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90 | uint32_t year; |
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91 | uint32_t year_days; |
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92 | uint32_t leap_years; |
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93 | |
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94 | if ( !time_buffer ) |
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95 | return RTEMS_INVALID_ADDRESS; |
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96 | |
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97 | if ( !_TOD_Is_set() ) |
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98 | return RTEMS_NOT_DEFINED; |
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99 | |
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100 | /* Obtain the current time */ |
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101 | _TOD_Get_timeval( &now ); |
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102 | |
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103 | /* How many days and how many seconds in the day ? */ |
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104 | days = now.tv_sec / RTEMS_SECS_PER_DAY; |
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105 | day_secs = now.tv_sec % RTEMS_SECS_PER_DAY; |
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106 | |
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107 | /* How many non-leap year years ? */ |
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108 | year = ( days / RTEMS_DAYS_PER_YEAR ) + RTEMS_YEAR_BASE; |
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109 | |
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110 | /* Determine the number of leap years. */ |
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111 | leap_years = _Leap_years_between( RTEMS_YEAR_BASE, year ); |
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112 | |
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113 | /* Adjust the remaining number of days based on the leap years. */ |
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114 | year_days = ( days - leap_years ) % RTEMS_DAYS_PER_YEAR; |
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115 | |
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116 | /* Adjust the year and days in the year if in the leap year overflow. */ |
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117 | if ( leap_years > ( days % RTEMS_DAYS_PER_YEAR ) ) { |
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118 | year -= 1; |
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119 | if ( _Leap_year( year ) ) { |
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120 | year_days += 1; |
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121 | } |
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122 | } |
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123 | |
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124 | time_buffer->year = year; |
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125 | time_buffer->month = _Year_day_as_month( year, &year_days ) + 1; |
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126 | time_buffer->day = year_days + 1; |
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127 | time_buffer->hour = day_secs / RTEMS_SECS_PER_HOUR; |
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128 | time_buffer->minute = day_secs % RTEMS_SECS_PER_HOUR; |
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129 | time_buffer->second = time_buffer->minute % RTEMS_SECS_PER_MINUTE; |
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130 | time_buffer->minute = time_buffer->minute / RTEMS_SECS_PER_MINUTE; |
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131 | time_buffer->ticks = now.tv_usec / |
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132 | rtems_configuration_get_microseconds_per_tick( ); |
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133 | |
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134 | return RTEMS_SUCCESSFUL; |
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135 | } |
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