Asynchronous replacement for stdio input functions for Emscripten and Terminal.js
Far from a complete solution, but functional.
First, install Terminal.js:
npm install
Replace all includes of <stdio.h> with "stdio_async.h".
Finally, compile your project with Emscripten to a.out.js, and open example.html. NOTE: Must be compliled with EMTERPRETIFY and EMTERPRETIFY_ASYNC enabled. See makefile for details.
Using Emterpreter, execution of the C code can be paused without track of what function is running. Whenever the C code blocks waiting for input, a polling loop is set up to check if the input has arrived, and sleep for a short time if is has not. This approach takes a fair bit of CPU depending on the polling interval, but works better than blocking the whole Javascript execution thread. The rest is simple plumbing and buffering for Terminal.js
- Backspace and other special characters are not handled
- Output only displays after a newline
- Probably many more