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Changed format_windows_error to not need LocalFree

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This is for non-'Desktop' applications that have a
more limited collection of functions.
This commit is contained in:
Michael Winterberg 2016-03-02 17:35:34 -08:00
parent 3ecad55910
commit 2a05a87fe7
1 changed files with 17 additions and 19 deletions
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36
cppformat/format.cc
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@ -588,27 +588,25 @@ FMT_FUNC void fmt::WindowsError::init(
FMT_FUNC void fmt::internal::format_windows_error(
fmt::Writer &out, int error_code,
fmt::StringRef message) FMT_NOEXCEPT {
class String {
private:
LPWSTR str_;
public:
String() : str_() {}
~String() { LocalFree(str_); }
LPWSTR *ptr() { return &str_; }
LPCWSTR c_str() const { return str_; }
};
FMT_TRY {
String system_message;
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, 0,
error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
reinterpret_cast<LPWSTR>(system_message.ptr()), 0, 0)) {
UTF16ToUTF8 utf8_message;
if (utf8_message.convert(system_message.c_str()) == ERROR_SUCCESS) {
out << message << ": " << utf8_message;
return;
MemoryBuffer<wchar_t, INLINE_BUFFER_SIZE> buffer;
buffer.resize(INLINE_BUFFER_SIZE);
for (;;) {
wchar_t *system_message = &buffer[0];
int result = FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
0, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
system_message, static_cast<uint32_t>(buffer.size()), 0);
if (result != 0) {
UTF16ToUTF8 utf8_message;
if (utf8_message.convert(system_message) == ERROR_SUCCESS) {
out << message << ": " << utf8_message;
return;
}
break;
}
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
break; // Can't get error message, report error code instead.
buffer.resize(buffer.size() * 2);
}
} FMT_CATCH(...) {}
fmt::format_error_code(out, error_code, message); // 'fmt::' is for bcc32.