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https://github.com/FEX-Emu/FEX.git
synced 2026-10-08 09:00:48 +02:00
Ryan Houdek
4e55f29589
va_list types have an edge where after operating on it, then it is undefined behaviour to do anything other than va_end on the object. So in order to call vsnprintf on it multiple times we must create copies with va_copy. Easy enough to work around by doing a few more copies of the va_list
65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
#include <FEXCore/Utils/LogManager.h>
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#include <sstream>
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#include <vector>
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namespace LogMan {
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namespace Throw {
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std::vector<ThrowHandler> Handlers;
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void InstallHandler(ThrowHandler Handler) { Handlers.emplace_back(Handler); }
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void UnInstallHandlers() { Handlers.clear(); }
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[[noreturn]] void M(const char *fmt, va_list args) {
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size_t MsgSize = 1024;
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char *Buffer = reinterpret_cast<char*>(alloca(MsgSize));
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va_list argsCopy;
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va_copy(argsCopy, args);
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size_t Return = vsnprintf(Buffer, MsgSize, fmt, argsCopy);
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va_end(argsCopy);
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if (Return >= MsgSize) {
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// Allocate a bigger size on failure
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MsgSize = Return;
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Buffer = reinterpret_cast<char*>(alloca(MsgSize));
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va_end(argsCopy);
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va_copy(argsCopy, args);
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vsnprintf(Buffer, MsgSize, fmt, argsCopy);
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va_end(argsCopy);
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}
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for (auto &Handler : Handlers) {
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Handler(Buffer);
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}
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__builtin_trap();
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}
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} // namespace Throw
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namespace Msg {
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std::vector<MsgHandler> Handlers;
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void InstallHandler(MsgHandler Handler) { Handlers.emplace_back(Handler); }
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void UnInstallHandlers() { Handlers.clear(); }
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void M(DebugLevels Level, const char *fmt, va_list args) {
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size_t MsgSize = 1024;
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char *Buffer = reinterpret_cast<char*>(alloca(MsgSize));
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va_list argsCopy;
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va_copy(argsCopy, args);
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size_t Return = vsnprintf(Buffer, MsgSize, fmt, argsCopy);
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va_end(argsCopy);
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if (Return >= MsgSize) {
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// Allocate a bigger size on failure
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MsgSize = Return;
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Buffer = reinterpret_cast<char*>(alloca(MsgSize));
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va_end(argsCopy);
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va_copy(argsCopy, args);
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vsnprintf(Buffer, MsgSize, fmt, argsCopy);
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va_end(argsCopy);
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}
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for (auto &Handler : Handlers) {
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Handler(Level, Buffer);
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}
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}
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} // namespace Msg
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} // namespace LogMan
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