scroll/src/bun/ffi.ts

/**
 * This is all the nasty ffi setup for the bun runtime
 */
import { dlopen, ptr, suffix } from 'bun:ffi';
import { IFFI } from '../common/types.ts';

const getLib = (name: string) => {
	return dlopen(
		name,
		{
			tcgetattr: {
				args: ['i32', 'pointer'],
				returns: 'i32',
			},
			tcsetattr: {
				args: ['i32', 'i32', 'pointer'],
				returns: 'i32',
			},
			cfmakeraw: {
				args: ['pointer'],
				returns: 'void',
			},
		},
	);
};

let cStdLib: any = { symbols: {} };

try {
	cStdLib = getLib(`libc.${suffix}`);
} catch {
	try {
		cStdLib = getLib(`libc.${suffix}.6`);
	} catch {
		throw new Error('Could not find c standard library');
	}
}

const { tcgetattr, tcsetattr, cfmakeraw } = cStdLib.symbols;
const BunFFI: IFFI = {
	tcgetattr,
	tcsetattr,
	cfmakeraw,
	getPointer: ptr,
};

export default BunFFI;