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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 | |
25 | namespace 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 | ||
38 | namespace boost { | |
39 | namespace 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??? | |
b32b8144 FG |
60 | #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64 |
61 | std::tm tmp; | |
62 | if(!localtime_r(t,&tmp)) | |
7c673cae | 63 | result = 0; |
b32b8144 FG |
64 | else |
65 | *result = tmp; | |
66 | #else | |
7c673cae | 67 | result = localtime_r(t, result); |
b32b8144 | 68 | #endif |
7c673cae FG |
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??? | |
b32b8144 FG |
78 | #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64 |
79 | std::tm tmp; | |
80 | if(!gmtime_r(t,&tmp)) | |
7c673cae FG |
81 | result = 0; |
82 | else | |
b32b8144 FG |
83 | *result = tmp; |
84 | #else | |
7c673cae | 85 | result = gmtime_r(t, result); |
b32b8144 | 86 | #endif |
7c673cae FG |
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___ |