You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/wasmer/lib/emscripten/src/env/windows
    
    the code of the file until where you have to start completion: /// NOTE: These syscalls only support wasm_32 for now because they 
    
pub fn _getenv(mut ctx: FunctionEnvMut<EmEnv>, name: u32) -> u32 {
    debug!("emscripten::_getenv");
    let memory = ctx.data().memory(0);
    let view = memory.view(&ctx);
    let name_string = read_string_from_wasm(&view, name);
    debug!("=> name({:?})", name_string);
    let c_str = unsafe { getenv(name_string.as_ptr() as *const libc::c_char) };
    if c_str.is_null() {
        return 0;
    }
    unsafe { copy_cstr_into_wasm(&mut ctx, c_str as *const c_char) }
}