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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . C A L E N D A R . C O N V E R S I O N S --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2008-2019, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package provides various routines for conversion between Ada and Unix
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33 -- time models - Time, Duration, struct tm and struct timespec.
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34
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35 with Interfaces.C;
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36 with Interfaces.C.Extensions;
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37
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38 package Ada.Calendar.Conversions is
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39
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40 function To_Ada_Time (Unix_Time : Interfaces.C.long) return Time;
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41 -- Convert a time value represented as number of seconds since the
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42 -- Unix Epoch to a time value relative to an Ada implementation-defined
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43 -- Epoch. The units of the result are nanoseconds on all targets. Raises
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44 -- Time_Error if the result cannot fit into a Time value.
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45
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46 function To_Ada_Time
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47 (tm_year : Interfaces.C.int;
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48 tm_mon : Interfaces.C.int;
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49 tm_day : Interfaces.C.int;
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50 tm_hour : Interfaces.C.int;
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51 tm_min : Interfaces.C.int;
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52 tm_sec : Interfaces.C.int;
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53 tm_isdst : Interfaces.C.int) return Time;
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54 -- Convert a time value expressed in Unix-like fields of struct tm into
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55 -- a Time value relative to the Ada Epoch. The ranges of the formals are
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56 -- as follows:
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57
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58 -- tm_year -- years since 1900
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59 -- tm_mon -- months since January [0 .. 11]
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60 -- tm_day -- day of the month [1 .. 31]
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61 -- tm_hour -- hours since midnight [0 .. 24]
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62 -- tm_min -- minutes after the hour [0 .. 59]
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63 -- tm_sec -- seconds after the minute [0 .. 60]
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64 -- tm_isdst -- Daylight Savings Time flag [-1 .. 1]
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65
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66 -- The returned value is in UTC and may or may not contain leap seconds
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67 -- depending on whether binder flag "-y" was used. Raises Time_Error if
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68 -- the input values are out of the defined ranges or if tm_sec equals 60
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69 -- and the instance in time is not a leap second occurrence.
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70
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71 function To_Duration
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72 (tv_sec : Interfaces.C.long;
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73 tv_nsec : Interfaces.C.long) return Duration;
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74 -- Convert an elapsed time value expressed in Unix-like fields of struct
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75 -- timespec into a Duration value. The expected ranges are:
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76
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77 -- tv_sec - seconds
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78 -- tv_nsec - nanoseconds
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79
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80 procedure To_Struct_Timespec
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81 (D : Duration;
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82 tv_sec : out Interfaces.C.long;
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83 tv_nsec : out Interfaces.C.long);
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84 -- Convert a Duration value into the constituents of struct timespec.
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85 -- Formal tv_sec denotes seconds and tv_nsecs denotes nanoseconds.
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86
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87 procedure To_Struct_Tm
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88 (T : Time;
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89 tm_year : out Interfaces.C.int;
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90 tm_mon : out Interfaces.C.int;
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91 tm_day : out Interfaces.C.int;
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92 tm_hour : out Interfaces.C.int;
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93 tm_min : out Interfaces.C.int;
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94 tm_sec : out Interfaces.C.int);
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95 -- Convert a Time value set in the Ada Epoch into the constituents of
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96 -- struct tm. The ranges of the out formals are as follows:
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97
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98 -- tm_year -- years since 1900
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99 -- tm_mon -- months since January [0 .. 11]
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100 -- tm_day -- day of the month [1 .. 31]
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101 -- tm_hour -- hours since midnight [0 .. 24]
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102 -- tm_min -- minutes after the hour [0 .. 59]
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103 -- tm_sec -- seconds after the minute [0 .. 60]
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104 -- tm_isdst -- Daylight Savings Time flag [-1 .. 1]
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105
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106 -- The input date is considered to be in UTC
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107
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108 function To_Unix_Time (Ada_Time : Time) return Interfaces.C.long;
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109 -- Convert a time value represented as number of time units since the Ada
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110 -- implementation-defined Epoch to a value relative to the Unix Epoch. The
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111 -- units of the result are seconds. Raises Time_Error if the result cannot
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112 -- fit into a Time value.
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113
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114 function To_Unix_Nano_Time
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115 (Ada_Time : Time) return Interfaces.C.Extensions.long_long;
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116 -- Convert a time value represented as number of time units since the Ada
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117 -- implementation-defined Epoch to a value relative to the Unix Epoch. The
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118 -- units of the result are nanoseconds. Raises Time_Error if the result
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119 -- cannot fit into a Time value.
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120
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121 end Ada.Calendar.Conversions;
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