1 files changed, 67 insertions, 0 deletions
diff --git a/services/sandbox-exec/lib/exec_standalone.js b/services/sandbox-exec/lib/exec_standalone.js
new file mode 100644
index 0000000..3b34adb
--- /dev/null
+++ b/services/sandbox-exec/lib/exec_standalone.js
@@ -0,0 +1,67 @@
+import { readFileSync } from 'node:fs';
+import PHPWasm from './php-wasm.js'
+
+const userCode = `
+while ($l = fgets(STDIN)) {
+  echo $l, PHP_EOL;
+}
+`;
+
+const PRELUDE = `
+define('STDIN', fopen('php://stdin', 'r'));
+define('STDOUT', fopen('php://stdout', 'r'));
+define('STDERR', fopen('php://stderr', 'r'));
+
+`;
+const BUFFER_MAX = 1024 * 1024 * 1;
+
+let stdinPos = 0; // bytewise
+let stdinBuf = Buffer.from(readFileSync('/dev/stdin'));
+let stdoutPos = 0; // bytewise
+let stdoutBuf = Buffer.alloc(BUFFER_MAX);
+let stderrPos = 0; // bytewise
+let stderrBuf = Buffer.alloc(BUFFER_MAX);
+
+const { ccall } = await PHPWasm({
+  stdin: () => {
+    if (stdinBuf.length <= stdinPos) {
+      return null;
+    }
+    return stdinBuf.readUInt8(stdinPos++);
+  },
+  stdout: (asciiCode) => {
+    if (asciiCode === null) {
+      return; // flush
+    }
+    if (BUFFER_MAX <= stdoutPos) {
+      return; // ignore
+    }
+    if (asciiCode < 0) {
+      asciiCode += 256;
+    }
+    stdoutBuf.writeUInt8(asciiCode, stdoutPos++);
+  },
+  stderr: (asciiCode) => {
+    if (asciiCode === null) {
+      return; // flush
+    }
+    if (BUFFER_MAX <= stderrPos) {
+      return; // ignore
+    }
+    if (asciiCode < 0) {
+      asciiCode += 256;
+    }
+    stderrBuf.writeUInt8(asciiCode, stderrPos++);
+  },
+});
+
+const result = ccall(
+  'php_wasm_run',
+  'number', ['string'],
+  [PRELUDE + userCode],
+);
+console.log({
+  status: result === 0 ? 'AC' : 'RE',
+  stdout: stdoutBuf.subarray(0, stdoutPos).toString(),
+  stderr: stderrBuf.subarray(0, stderrPos).toString(),
+});