user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<longestValidParentheses2>:
  endbr64
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    $0x0,%ebp
  test   %rdi,%rdi
  je     L283
  mov    %rdi,%rbx
  call   <strlen@plt>
  mov    %eax,%ebp
  lea    0x1(%rax),%edi
  call   <malloc@plt>
  mov    %rax,%rdi
  test   %rax,%rax
  je     L175
  movslq %ebp,%rsi
  add    %rax,%rsi
  movzbl (%rbx),%edx
  test   %dl,%dl
  je     L157
  mov    %rax,%rcx
  jmp    L85
L82:
  movb   $0x28,(%rcx)
  add    $0x1,%rcx
L149:
  add    $0x1,%rbx
  movzbl (%rbx),%edx
  test   %dl,%dl
  je     L157
L85:
  cmp    $0x28,%dl
  je     L82
  cmp    $0x29,%dl
  jne    L149
  cmp    %rcx,%rdi
  je     L128
  cmpb   $0x28,-0x1(%rcx)
  je     L54
L128:
  cmpb   $0x2a,-0x1(%rcx)
  je     L225
  cmp    %rcx,%rsi
  je     L149
  movb   $0x29,(%rcx)
  add    $0x1,%rcx
  jmp    L149
L54:
  movb   $0x2a,-0x1(%rcx)
  lea    -0x1(%rcx),%rdx
  cmp    %rdx,%rdi
  je     L149
  lea    -0x2(%rcx),%rax
  cmp    %rax,%rdi
  je     L149
L19:
  cmpb   $0x2a,(%rax)
  jne    L149
  sub    $0x1,%rax
  cmp    %rax,%rdi
  jne    L19
  jmp    L149
L225:
  cmpb   $0x28,(%rax)
  je     L6
  cmp    %rcx,%rsi
  je     L149
  movb   $0x29,(%rcx)
  add    $0x1,%rcx
  jmp    L149
L6:
  movb   $0x2a,(%rax)
  cmp    %rax,%rdi
  je     L149
L123:
  sub    $0x1,%rax
  cmp    %rax,%rdi
  je     L149
  cmpb   $0x2a,(%rax)
  je     L123
  jmp    L149
L157:
  test   %ebp,%ebp
  jle    L282
  mov    %rdi,%rdx
  lea    -0x1(%rbp),%eax
  lea    0x1(%rdi,%rax,1),%rax
  mov    $0x0,%ecx
  mov    $0x0,%esi
  jmp    L224
L220:
  cmp    %ecx,%esi
  cmovl  %ecx,%esi
  mov    $0x0,%ecx
L162:
  add    $0x1,%rdx
  cmp    %rax,%rdx
  je     L160
L224:
  cmpb   $0x2a,(%rdx)
  jne    L220
  add    $0x2,%ecx
  jmp    L162
L282:
  mov    $0x0,%ecx
  mov    $0x0,%esi
L160:
  cmp    %ecx,%esi
  cmovge %esi,%ecx
  mov    %ecx,%ebp
  call   <free@plt>
L283:
  mov    %ebp,%eax
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  ret
L175:
  mov    $0xffffffff,%ebp
  jmp    L283
```

assistant: ```c
int longestValidParentheses2(char *s) {
  if (s == NULL) {
    return 0;
  }
  int maxLen = 0;
  int curLen = 0;
  int sLen = strlen(s);
  char *stack = (char *)malloc((sLen + 1) * sizeof(char));
  if (stack == NULL) {
    return -1;
  }
  char *pStack = stack;
  char *stackEnd = stack + sLen;
  char *stackPre = stack;
  ;
  while (*s) {
    switch (*s) {
    case '(':
      *pStack = *s;
      pStack++;
      break;
    case ')':
      if (pStack != stack && *(pStack - 1) == '(') {
        *(pStack - 1) = '*';
        if (pStack - 1 != stack) {
          stackPre = pStack - 2;
          while (stackPre != stack && *stackPre == '*') {
            stackPre--;
          }
        }
      } else if (*(pStack - 1) == '*') {
        if (*stackPre == '(') {
          *stackPre = '*';
          while (stackPre != stack && *stackPre == '*') {
            stackPre--;
          }
        } else if (pStack != stackEnd) {
          *pStack = ')';
          pStack++;
        }
      } else if (pStack != stackEnd) {
        *pStack = ')';
        pStack++;
      }
      break;
    }
    s++;
  }
  pStack = stack;
  int i = 0;
  for (i = 0; i < sLen; i++) {
    if (pStack[i] == '*') {
      curLen += 2;
    } else {
      if (curLen > maxLen) {
        maxLen = curLen;
      }
      curLen = 0;
    }
  }
  if (curLen > maxLen) {
    maxLen = curLen;
  }
  free(stack);
  return maxLen;
}
```