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annotate C++/DynLib.cpp @ 248:d157f4747676

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Directory: fix _WIN32 DynLib: fix _WIN32
author David Demelier <markand@malikania.fr>
date Wed, 01 Oct 2014 14:37:42 +0200
parents 274b4f216e65
children 24085fae3162
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1 /*
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2 * DynLib.cpp -- portable shared library loader
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3 *
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4 * Copyright (c) 2013 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <stdexcept>
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20
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21 #if defined(_WIN32)
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22 # include <Windows.h>
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23 #else
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24 # include <dlfcn.h>
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25 #endif
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26
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27 #include "DynLib.h"
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28
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29 #if defined(_WIN32)
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30
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31 namespace {
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32
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33 std::string systemError()
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34 {
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35 LPSTR error = nullptr;
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36 std::string errmsg = "Unknown error";
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37
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38 FormatMessageA(
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39 FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
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40 NULL,
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41 GetLastError(),
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42 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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43 (LPSTR)&error, 0, NULL);
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44
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45 if (error) {
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46 errmsg = std::string(error);
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47 LocalFree(error);
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48 }
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49
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50 return errmsg;
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51 }
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52
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53 }
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54
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55 void DynLib::systemInit()
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56 {
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57 m_handle = nullptr;
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58 }
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59
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60 DynLib::Handle DynLib::systemLoad(const std::string &path, Policy policy) const
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61 {
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62 Handle handle = LoadLibraryA(path.c_str());
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63
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64 if (handle == nullptr)
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65 throw std::runtime_error(systemError());
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66
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67 return handle;
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68 }
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69
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70 DynLib::Sym DynLib::systemSym(const std::string &name)
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71 {
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72 Sym sym;
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73
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74 if (m_handle == nullptr)
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75 throw std::runtime_error("library not loaded");
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76
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77 sym = GetProcAddress(m_handle, name.c_str());
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78 if (sym == nullptr)
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79 throw std::out_of_range(systemError());
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80
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81 return sym;
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82 }
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83
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84 void DynLib::systemClose()
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85 {
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86 if (m_handle != nullptr)
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87 FreeLibrary(m_handle);
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88 }
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89
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90 #else
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91
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92 void DynLib::systemInit()
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93 {
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94 m_handle = nullptr;
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95 }
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96
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97 DynLib::Handle DynLib::systemLoad(const std::string &path, Policy policy) const
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98 {
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99 int mode = (policy == Immediately) ? RTLD_NOW : RTLD_LAZY;
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100 Handle handle;
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101
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102 handle = dlopen(path.c_str(), mode);
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103 if (handle == nullptr)
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104 throw std::runtime_error(dlerror());
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105
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106 return handle;
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107 }
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108
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109 DynLib::Sym DynLib::systemSym(const std::string &name)
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110 {
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111 Sym sym;
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112
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113 if (m_handle == nullptr)
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114 throw std::runtime_error("library not loaded");
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115
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116 sym = dlsym(m_handle, name.c_str());
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117 if (sym == nullptr)
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118 throw std::out_of_range(dlerror());
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119
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120 return sym;
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121 }
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122
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123 void DynLib::systemClose()
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124 {
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125 if (m_handle != nullptr)
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126 dlclose(m_handle);
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127 }
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128
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129 #endif
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130
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131 DynLib::DynLib()
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132 {
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133 systemInit();
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134 }
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135
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136 DynLib::DynLib(const std::string &path, Policy policy)
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137 {
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138 m_handle = systemLoad(path, policy);
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139 }
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140
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141 DynLib::~DynLib()
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142 {
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143 systemClose();
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144 }