Make use of security enhanced C functions

[GarronFish]

Make use of the Windows security enhanced funcitons such as _wfopen_s instead of _wfopen for Windows. This request has occurred because a client was finding that Windows defender was blocking the use of readRealMatrix in MSL 4.1 (i,e, scalar(Modelica.Utilities.Streams.readRealMatrix("inputs.mat", "h_gas_to_carcass", 1, 1)))

The new behaviour by Windows Defender is likely due to fopen changing to _wfopen (Found by Ulf at DS). I don't see why this is a thing and seems like inconsistent behaviour in Windows Defender, however the security enhanced functions functions should be used.

[beutlich]

I guess you are referring to fopen_s vs. fopen since _wfopen is the wide-string variant and not the security-enhanced variant.

[GarronFish]

Well the change to the library was from fopen to _wfopen in MSL 4.1

This ticket proposes that the _s functions be used.

[beutlich]

So you only refer to bba62c1 which introduced _wfopen in ModelicaMatIO.c some 5 years ago. What about the many other occurrences of plain fopen?

Please note that MAP-Lib does not provide security updates for MSL v4.1.0, see https://github.com/modelica/ModelicaStandardLibrary/security/policy.

[GarronFish]

We are not 100% sure what change between MSL 4.0 and MSL 4.1 caused the Windows Defender issue. Ulf proposed that this was the change from fopen to _wfopen (which seemed like a possibility to me), unfortunately I cannot reproduce the issue locally. While looking into this I figured that we should be using the _s functions so this is not a fix for MSL 4.1 just an enhancement request.