【Bun】FFI で C 言語の printf を呼び出す

bun:ffi モジュールを読み込む

// https://bun.sh/docs/api/ffi

import { dlopen, FFIType, suffix } from "bun:ffi";

// Linux
const path = `libc.${suffix}.6`;
// macOS
// const = path = `libSystem.B.$[suffix]`;

const {
  symbols: { printf }
} = dlopen(
  path,
  {
    printf: { args: [FFIType.cstring, FFIType.cstring] }
  }
);

// https://bun.sh/docs/api/binary-data

const format = new TextEncoder().encode("%s\n");
const str = new TextEncoder().encode("hello World");
// const str = Buffer.from("Hello World");

printf(format, str);