// Deno-specific ffi code

// Determine library extension based on
// your OS.
let libSuffix = '';
switch (Deno.build.os) {
	case 'windows':
		libSuffix = 'dll';
		break;
	case 'darwin':
		libSuffix = 'dylib';
		break;
	default:
		libSuffix = 'so';
		break;
}

const cSharedLib = `./libc.${libSuffix}`;
const cStdLib = Deno.dlopen(
	cSharedLib,
	{
	termios: {
		type: {
			struct: [
				// c_iflag
				'u32',
				// c_oflag
				'u32',
				// c_cflag
				'u32',
				// c_lflag
				'u32',
				// c_cc[20]
				'u8', 'u8', 'u8', 'u8', 'u8',
				'u8', 'u8', 'u8', 'u8', 'u8',
				'u8', 'u8', 'u8', 'u8', 'u8',
				'u8', 'u8', 'u8', 'u8', 'u8',
				// __ispeed
				'i32',
				// __ospeed
				'i32',
			]
		}
	},
	tcgetattr: {
		parameters: ['i32', 'pointer'],
		result: 'i32',
	},
	tcsetattr: {
		parameters: ['i32', 'i32', 'pointer'],
		result: 'i32',
	},
	cfmakeraw: {
		parameters: ['pointer'],
		result: 'void',
	},
} as const,
);

export default cStdLib.symbols;
export const termios = cStdLib.symbols.termios;
export const tcgetattr = cStdLib.symbols.tcgetattr;
export const tcsetattr = cStdLib.symbols.tcsetattr;
export const cfmakeraw = cStdLib.symbols.cfmakeraw;