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 localtimeboost::date_time::c_time57 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 gmtimeboost::date_time::c_time75 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