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General: Make ignoring a discarded return value an error

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Allows our CI to catch more potential bugs. This also removes the
[[nodiscard]] attribute of IOFile's Open member function. There are
cases where a file may want to be opened, but have the status of it
checked at a later time.
This commit is contained in:
Lioncash 2020-10-29 23:30:42 -04:00
parent 7dcf4c0018
commit 26547d3e3b
3 changed files with 17 additions and 6 deletions
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15
src/common/misc.cpp
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@ -16,16 +16,23 @@
// Call directly after the command or use the error num.
// This function might change the error code.
std::string GetLastErrorMsg() {
static const std::size_t buff_size = 255;
static constexpr std::size_t buff_size = 255;
char err_str[buff_size];
#ifdef _WIN32
FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), err_str, buff_size, nullptr);
return std::string(err_str, buff_size);
#elif defined(__GLIBC__) && (_GNU_SOURCE || (_POSIX_C_SOURCE < 200112L && _XOPEN_SOURCE < 600))
// Thread safe (GNU-specific)
const char* str = strerror_r(errno, err_str, buff_size);
return std::string(str);
#else
// Thread safe (XSI-compliant)
strerror_r(errno, err_str, buff_size);
const int success = strerror_r(errno, err_str, buff_size);
if (success != 0) {
return {};
}
return std::string(err_str);
#endif
return std::string(err_str, buff_size);
}