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feat: use thread-safe variant of strerror
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@ -11,11 +11,57 @@
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namespace toml
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{
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namespace detail
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{
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inline std::string str_error(int errnum)
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{
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// C++ standard strerror is not thread-safe.
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// C11 provides thread-safe version of this function, `strerror_s`, but it
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// is not available in C++.
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// To avoid using std::strerror, we need to use platform-specific functions.
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// If none of the conditions are met, it calls std::strerror as a fallback.
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#ifdef _MSC_VER // MSVC
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constexpr std::size_t bufsize = 256;
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std::array<char, bufsize> buf;
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const auto result = strerror_s(buf.data(), bufsize, errnum);
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if(result != 0)
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{
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return std::string("strerror_s failed");
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}
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else
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{
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return std::string(buf.data());
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}
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#elif (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE // XSI
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constexpr std::size_t bufsize = 256;
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std::array<char, bufsize> buf;
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const int result = strerror_r(errnum, buf.data(), bufsize);
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if (result != 0)
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{
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return std::string("strerror_r failed");
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}
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else
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{
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return std::string(buf.data());
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}
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#elif defined(_GNU_SOURCE) // GNU extension
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constexpr std::size_t bufsize = 256;
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std::array<char, bufsize> buf;
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const char* result = strerror_r(errnum, buf.data(), bufsize);
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return std::string(result);
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#else // fallback
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return std::strerror(errnum);
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#endif
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}
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} // detail
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struct file_io_error : public std::runtime_error
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{
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public:
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file_io_error(int errnum, const std::string& msg, const std::string& fname)
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: std::runtime_error(msg + " \"" + fname + "\": " + std::strerror(errnum)),
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: std::runtime_error(msg + " \"" + fname + "\": " + detail::str_error(errnum)),
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errno_(errnum)
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{}
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int get_errno() const noexcept {return errno_;}
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