Function skipStdbufFlags

src/tools/BashTool/pathValidation.ts:1225–1237

* Parse stdbuf's flags (-i/-o/-e in fused/space-separated/long-= forms). * Returns argv index of wrapped COMMAND, or -1 if unparseable or no flags * consumed (stdbuf without flags is inert). Mirrors checkSemantics (ast.ts).

(a: readonly string[])

 * consumed (stdbuf without flags is inert). Mirrors checkSemantics (ast.ts).
 */
function skipStdbufFlags(a: readonly string[]): number {
  let i = 1
  while (i < a.length) {
    const arg = a[i]!
    if (/^-[ioe]$/.test(arg) && a[i + 1]) i += 2
    else if (/^-[ioe]./.test(arg)) i++
    else if (/^--(input|output|error)=/.test(arg)) i++
    else if (arg.startsWith('-'))
      return -1 // unknown flag: fail closed
    else break
  }
  return i > 1 && i < a.length ? i : -1
}

/**
 * Parse env's VAR=val and safe flags (-i/-0/-v/-u NAME). Returns argv index