updates

kernel/bin/pathchk

@@ -0,0 +1,26 @@
+/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
+function bareStdin(ctx) {
+  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
+}
+
+async function run(ctx, argv) {
+  const paths = argv.slice(1).filter((a) => !a.startsWith('-'))
+  if (!paths.length) {
+    ctx.console.error('pathchk: missing operand')
+    return
+  }
+  for (const p of paths) {
+    if (!p.length) {
+      ctx.console.error('pathchk: empty path name')
+      continue
+    }
+    if (p.length > 4096) {
+      ctx.console.error('pathchk: path too long')
+      continue
+    }
+    if (p.includes('\0')) {
+      ctx.console.error('pathchk: NUL in path')
+      continue
+    }
+  }
+}