rshim is the shim program written in rust.

There are several versions of shim:

• the official shim.cs was written in c# and required an instantiation of a .NET command line app every time it was started therefore is slower than directly executing. And it dose not handle Ctrl+C event correctly.

• shim.c is ok with performance and Ctrl+C event handling,but sometimes suffer memory violation (randomly exited with return code 3221226356).

• shim.cpp didn't work on my machine, calling it with any executable result in an infinite recursion of creating subprocess until eating all memory for unknown subtle reason.

• less probability with bug and undefined behavior.
• properly handle variety errors.
• friendly error message.
• properly handle Ctrl+C events.
• properly handle utf-8 with or without bom in shim file.

• relies heavily on Win32 API, moreso than the original
• reduced binary size massively (134KB static compared to 300KB)
• handle quoted strings
• some slight speed improvements

First install rust

cargo build --release

Close any running process with existing shims, then

./repshims.bat

• remove core::fmt entirely
• make it run with #![no_std]

• Without crt-static enabled: around 48KB
• With crt-static enabled: around 134KB