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annotate DPF-Prymula-audioplugins/dpf/distrho/extra/ScopedSafeLocale.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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3
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #ifndef DISTRHO_SCOPED_SAFE_LOCALE_HPP_INCLUDED
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18 #define DISTRHO_SCOPED_SAFE_LOCALE_HPP_INCLUDED
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19
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20 #include "../DistrhoUtils.hpp"
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21
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22 #include <clocale>
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23
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24 #if ! (defined(DISTRHO_OS_HAIKU) || defined(DISTRHO_OS_MAC) || defined(DISTRHO_OS_WINDOWS))
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25 # define DISTRHO_USE_NEWLOCALE
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26 #endif
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27
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28 #if defined(DISTRHO_OS_WINDOWS) && __MINGW64_VERSION_MAJOR >= 5
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29 # define DISTRHO_USE_CONFIGTHREADLOCALE
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30 #endif
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31
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32 START_NAMESPACE_DISTRHO
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33
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34 // -----------------------------------------------------------------------
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35 // ScopedSafeLocale class definition
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36
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37 /**
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38 ScopedSafeLocale is a handy class for setting current locale to C on constructor, and revert back on destructor.
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39 It tries to be thread-safe, but it is not always possible.
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40
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41 Put it inside a scope of code where string conversions happen to ensure they are consistent across many systems.
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42 For example:
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43
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44 ```
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45 // stack buffer to put converted float value in
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46 char strbuf[0xff];
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47
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48 {
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49 // safe locale operations during this scope
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50 const ScopedSafeLocale sl;
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51 snprintf(strbuf, 0xff, "%f", value);
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52 }
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53
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54 // do something with `strbuf` now, locale is reverted and left just as it was before
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55 ```
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56 */
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57 class ScopedSafeLocale {
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58 public:
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59 /*
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60 * Constructor.
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61 * Current system locale will saved, while "C" is set as the next one to use.
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62 */
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63 inline ScopedSafeLocale() noexcept;
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64
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65 /*
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66 * Destructor.
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67 * System locale will revert back to the one saved during constructor.
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68 */
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69 inline ~ScopedSafeLocale() noexcept;
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70
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71 private:
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72 #ifdef DISTRHO_USE_NEWLOCALE
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73 locale_t newloc, oldloc;
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74 #else
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75 # ifdef DISTRHO_USE_CONFIGTHREADLOCALE
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76 const int oldthreadloc;
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77 # endif
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78 char* const oldloc;
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79 #endif
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80
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81 DISTRHO_DECLARE_NON_COPYABLE(ScopedSafeLocale)
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82 DISTRHO_PREVENT_HEAP_ALLOCATION
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83 };
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84
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85 // -----------------------------------------------------------------------
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86 // ScopedSafeLocale class implementation
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87
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88 #ifdef DISTRHO_USE_NEWLOCALE
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89 static constexpr const locale_t kNullLocale = (locale_t)nullptr;
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90 #endif
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91
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92 inline ScopedSafeLocale::ScopedSafeLocale() noexcept
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93 #ifdef DISTRHO_USE_NEWLOCALE
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94 : newloc(::newlocale(LC_NUMERIC_MASK, "C", kNullLocale)),
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95 oldloc(newloc != kNullLocale ? ::uselocale(newloc) : kNullLocale) {}
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96 #else
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97 # ifdef DISTRHO_USE_CONFIGTHREADLOCALE
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98 : oldthreadloc(_configthreadlocale(_ENABLE_PER_THREAD_LOCALE)),
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99 # else
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100 :
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101 # endif
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102 oldloc(strdup(::setlocale(LC_NUMERIC, nullptr)))
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103 {
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104 ::setlocale(LC_NUMERIC, "C");
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105 }
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106 #endif
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107
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108 inline ScopedSafeLocale::~ScopedSafeLocale() noexcept
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109 {
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110 #ifdef DISTRHO_USE_NEWLOCALE
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111 if (oldloc != kNullLocale)
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112 ::uselocale(oldloc);
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113 if (newloc != kNullLocale)
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114 ::freelocale(newloc);
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115 #else // DISTRHO_USE_NEWLOCALE
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116 if (oldloc != nullptr)
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117 {
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118 ::setlocale(LC_NUMERIC, oldloc);
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119 std::free(oldloc);
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120 }
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121
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122 # ifdef DISTRHO_USE_CONFIGTHREADLOCALE
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123 if (oldthreadloc != -1)
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124 _configthreadlocale(oldthreadloc);
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125 # endif
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126 #endif // DISTRHO_USE_NEWLOCALE
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127 }
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128
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129 // -----------------------------------------------------------------------
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130
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131 #undef DISTRHO_USE_CONFIGTHREADLOCALE
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132 #undef DISTRHO_USE_NEWLOCALE
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133
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134 END_NAMESPACE_DISTRHO
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135
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136 #endif // DISTRHO_SCOPED_SAFE_LOCALE_HPP_INCLUDED