I want to add "%userprofile%" to the InstallPath

I want to expand this part to work with %userprofile% (or maybe even any environment variables), but I don't know how to actually retrieve environment variables in C++ (well, not without adding extra bloat like std::).

My question is: are there any functionality already in the codebase to access environment variables? Where can I find it?

I am guessing you want to imitate

7-Zip/CPP/7zip/Bundles/SFXSetup/SfxSetup.cpp

Lines 245 to 257 in dfe3836

    
           if (installPath.Find(L"%%S") >= 0) 
        
           { 
        
           	FString s2 = fullPath; 
        
           	int sep = s2.ReverseFind_PathSepar(); 
        
           	if (sep > 0) { 
        
           		s2.DeleteFrom(sep + 1); 
        
           		NName::NormalizeDirPathPrefix(s2); 
        
           		sep = s2.Len(); 
        
           		if (sep > 0 && IS_PATH_SEPAR(s2[sep - 1])) 
        
           			s2.DeleteFrom(sep - 1); 
        
           	} 
        
           	installPath.Replace(L"%%S", fs2us(s2)); 
        
           }

to implement that feature.

And retrieving an environment variable is as easy as calling GetEnvironmentVariable(). There is one precedent for this in the current code:

7-Zip/C/Util/7zipInstall/7zipInstall.c

Line 1048 in dfe3836

DWORD ttt = GetEnvironmentVariableW(L"ProgramW6432", path, MAX_PATH);

Thanks for the info

	if (installPath.Find(L"%%S") >= 0)
	{
	FString s2 = fullPath;
	int sep = s2.ReverseFind_PathSepar();
	if (sep > 0) {
	s2.DeleteFrom(sep + 1);
	NName::NormalizeDirPathPrefix(s2);
	sep = s2.Len();
	if (sep > 0 && IS_PATH_SEPAR(s2[sep - 1]))
	s2.DeleteFrom(sep - 1);
	}
	installPath.Replace(L"%%S", fs2us(s2));
	}