Visual C++ 6.0 does not start (MSDEV loops at 100% CPU forever)

reactos-bootcd-0.4.15-dev-7320-gf2d34ab-x86-gcc-lin-dbg

Note : installation needs WineVDM and https://github.com/reactos/reactos/pull/6184 to be applied

• Start Microsoft Visual C++ 6.0
• MSDEV.EXE stuck at 100% cpu forever

According to simonelombardo investigation shared in Mattermost chat, this comes from a recurring iteration on _ismbcspace which is not implemented correctly

https://github.com/reactos/reactos/blob/master/sdk/lib/crt/mbstring/ismbc.c#L69

/*

 * @implemented

 */

int _ismbcspace( unsigned int c )

{

    return ((c) == 0x8140);

} 

while its specification is

https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/ismbcgraph-functions?view=msvc-170

_ismbcspace | White space | Returns nonzero if and only if c is a white-space character: c=0x20 or 0x09<=c<=0x0D.