Use new compile flag WIN32_VS to add/change logic of sftp client and
sftp server codes so that MS Visual Studio 2015 compiler and runtime can
be used. opendir(), readdir(), closedir() directory APIs and basename()
API of Unix/Linux are implemented in Windows as they are not available
in Windows/VisualStudio C-runtime. win32_dirent.c and win32_dirent.h
files added as dirent.c and dirent.h are not available in Windows and we
do not want to affect mingW/gcc builds for Windows which have those
files available.
Fix the reported problem #7. Remote directory set to remote user's home
directory like its is done on openssh on all platforms. Users can then
cd to "Documents" directory. Actual fix was to expand "." to user's home
directory so that pwd showed it correctly rather than just showing a
dot.
Fixed sftp-server put verb not working. Tested from out sftp client and
linux fedora openssh 6.9p1 sftp clients in transferring small and large
files using both get and put verbs.
sftp-server.exe code modified to work in Windows as NoMachine never
finished it to work. I/O handling to work as a subsystem and
openssh7.1p1 sshbuf_new() buffer system code had to be used. sshd_config
file need location of sftp subsystem to be specified.
