1#ifndef DATE_TIME_C_TIME_HPP___
2#define DATE_TIME_C_TIME_HPP___
3
4/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
5 * Use, modification and distribution is subject to the
6 * Boost Software License, Version 1.0. (See accompanying
7 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
8 * Author: Jeff Garland, Bart Garst
9 * $Date$
10 */
11
12
13/*! @file c_time.hpp
14 Provide workarounds related to the ctime header
15*/
16
17#include <ctime>
18#include <string> // to be able to convert from string literals to exceptions
19#include <stdexcept>
20#include <boost/throw_exception.hpp>
21#include <boost/date_time/compiler_config.hpp>
22
23//Work around libraries that don't put time_t and time in namespace std
24#ifdef BOOST_NO_STDC_NAMESPACE
25namespace std { using ::time_t; using ::time; using ::localtime;
26 using ::tm; using ::gmtime; }
27#endif // BOOST_NO_STDC_NAMESPACE
28
29//The following is used to support high precision time clocks
30#ifdef BOOST_HAS_GETTIMEOFDAY
31#include <sys/time.h>
32#endif
33
34#ifdef BOOST_HAS_FTIME
35#include <time.h>
36#endif
37
38namespace boost {
39namespace date_time {
40 //! Provides a uniform interface to some 'ctime' functions
41 /*! Provides a uniform interface to some ctime functions and
42 * their '_r' counterparts. The '_r' functions require a pointer to a
43 * user created std::tm struct whereas the regular functions use a
44 * staticly created struct and return a pointer to that. These wrapper
45 * functions require the user to create a std::tm struct and send in a
46 * pointer to it. This struct may be used to store the resulting time.
47 * The returned pointer may or may not point to this struct, however,
48 * it will point to the result of the corresponding function.
49 * All functions do proper checking of the C function results and throw
50 * exceptions on error. Therefore the functions will never return NULL.
51 */
52 struct c_time {
53 public:
54#if defined(BOOST_DATE_TIME_HAS_REENTRANT_STD_FUNCTIONS)
55 //! requires a pointer to a user created std::tm struct
56 inline
57 static std::tm* localtime(const std::time_t* t, std::tm* result)
58 {
59 // localtime_r() not in namespace std???
60 #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
61 std::tm tmp;
62 if(!localtime_r(t,&tmp))
63 result = 0;
64 else
65 *result = tmp;
66 #else
67 result = localtime_r(t, result);
68 #endif
69 if (!result)
70 boost::throw_exception(std::runtime_error("could not convert calendar time to local time"));
71 return result;
72 }
73 //! requires a pointer to a user created std::tm struct
74 inline
75 static std::tm* gmtime(const std::time_t* t, std::tm* result)
76 {
77 // gmtime_r() not in namespace std???
78 #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
79 std::tm tmp;
80 if(!gmtime_r(t,&tmp))
81 result = 0;
82 else
83 *result = tmp;
84 #else
85 result = gmtime_r(t, result);
86 #endif
87 if (!result)
88 boost::throw_exception(std::runtime_error("could not convert calendar time to UTC time"));
89 return result;
90 }
91#else // BOOST_DATE_TIME_HAS_REENTRANT_STD_FUNCTIONS
92
93#if (defined(_MSC_VER) && (_MSC_VER >= 1400))
94#pragma warning(push) // preserve warning settings
95#pragma warning(disable : 4996) // disable depricated localtime/gmtime warning on vc8
96#endif // _MSC_VER >= 1400
97 //! requires a pointer to a user created std::tm struct
98 inline
99 static std::tm* localtime(const std::time_t* t, std::tm* result)
100 {
101 result = std::localtime(t);
102 if (!result)
103 boost::throw_exception(std::runtime_error("could not convert calendar time to local time"));
104 return result;
105 }
106 //! requires a pointer to a user created std::tm struct
107 inline
108 static std::tm* gmtime(const std::time_t* t, std::tm* result)
109 {
110 result = std::gmtime(t);
111 if (!result)
112 boost::throw_exception(std::runtime_error("could not convert calendar time to UTC time"));
113 return result;
114 }
115#if (defined(_MSC_VER) && (_MSC_VER >= 1400))
116#pragma warning(pop) // restore warnings to previous state
117#endif // _MSC_VER >= 1400
118
119#endif // BOOST_DATE_TIME_HAS_REENTRANT_STD_FUNCTIONS
120 };
121}} // namespaces
122
123#endif // DATE_TIME_C_TIME_HPP___
124