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Fix memory corruption in ImFileOpen on Windows when ImWchar is 32-bit (IMGUI_USE_WCHAR32 is set)

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Ref issue 4149
This commit is contained in:
Ash Wolf 2021-05-17 02:30:20 +01:00 committed by ocornut
parent c28be6ffce
commit 11083874bc
1 changed files with 4 additions and 4 deletions
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8
imgui.cpp
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@ -1819,12 +1819,12 @@ ImFileHandle ImFileOpen(ImStrv filename, ImStrv mode)
// Previously we used ImTextCountCharsFromUtf8/ImTextStrFromUtf8 here but we now need to support ImWchar16 and ImWchar32!
const int filename_wsize = ::MultiByteToWideChar(CP_UTF8, 0, filename.Begin, (int)filename.length(), NULL, 0);
const int mode_wsize = ::MultiByteToWideChar(CP_UTF8, 0, mode.Begin, (int)mode.length(), NULL, 0);
ImVector<ImWchar> buf;
ImVector<wchar_t> buf;
buf.resize(filename_wsize + 1 + mode_wsize + 1);
::MultiByteToWideChar(CP_UTF8, 0, filename.Begin, (int)filename.length(), (wchar_t*)&buf[0], filename_wsize);
::MultiByteToWideChar(CP_UTF8, 0, mode.Begin, (int)mode.length(), (wchar_t*)&buf[filename_wsize + 1], mode_wsize);
::MultiByteToWideChar(CP_UTF8, 0, filename.Begin, (int)filename.length(), &buf[0], filename_wsize);
::MultiByteToWideChar(CP_UTF8, 0, mode.Begin, (int)mode.length(), &buf[filename_wsize + 1], mode_wsize);
buf[filename_wsize] = buf[filename_wsize + 1 + mode_wsize] = 0;
return ::_wfopen((const wchar_t*)&buf[0], (const wchar_t*)&buf[filename_wsize + 1]);
return ::_wfopen(&buf[0], &buf[filename_wsize + 1]);
#else
// ImStrv is not guaranteed to be zero-terminated.
ImStrv filename_0 = ImStrdup(filename);