user: 这段汇编代码用C语言表示是什么样的?

```asm
<path_within_dir>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x58,%rsp
  mov    %rdi,-0x78(%rbp)
  mov    %rsi,-0x80(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  cmpq   $0x0,-0x78(%rbp)
  jne    L128
  mov    $0x0,%eax
  jmp    L15
L128:
  mov    D24(%rip),%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x68(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r10
  mov    $0x0,%r11d
  movslq %eax,%rdx
  mov    %rdx,%r8
  mov    $0x0,%r9d
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L195:
  cmp    %rdx,%rsp
  je     L173
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L195
L173:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L180
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L180:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x60(%rbp)
  mov    -0x60(%rbp),%rdx
  mov    -0x80(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <realpath@plt>
  test   %rax,%rax
  jne    L91
  mov    $0x0,%eax
  jmp    L15
L91:
  mov    -0x78(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  jne    L213
  mov    -0x60(%rbp),%rdx
  mov    -0x78(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strstr@plt>
  mov    %rax,-0x58(%rbp)
  mov    -0x58(%rbp),%rax
  cmp    -0x78(%rbp),%rax
  je     L213
  mov    $0x0,%eax
  jmp    L15
L213:
  mov    D24(%rip),%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x50(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L219:
  cmp    %rdx,%rsp
  je     L179
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L219
L179:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L57
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L57:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x48(%rbp)
  mov    -0x78(%rbp),%rax
  mov    %rax,%rdi
  call   <xxstrdup@plt>
  mov    %rax,-0x40(%rbp)
  movl   $0x1,-0x6c(%rbp)
  jmp    L71
L166:
  mov    -0x58(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x48(%rbp),%rdx
  mov    -0x40(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <realpath@plt>
  test   %rax,%rax
  je     L65
  mov    -0x60(%rbp),%rdx
  mov    -0x48(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strstr@plt>
  mov    %rax,-0x58(%rbp)
  mov    -0x48(%rbp),%rax
  cmp    -0x58(%rbp),%rax
  je     L215
  movl   $0x0,-0x6c(%rbp)
  jmp    L215
L65:
  mov    D20(%rip),%rax
  mov    (%rax),%rdx
  mov    D14(%rip),%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  je     L71
  movl   $0x0,-0x6c(%rbp)
  jmp    L110
L71:
  mov    -0x40(%rbp),%rax
  mov    $0x2f,%esi
  mov    %rax,%rdi
  call   <strrchr@plt>
  mov    %rax,-0x58(%rbp)
  cmpq   $0x0,-0x58(%rbp)
  jne    L166
  jmp    L110
L215:
  nop
L110:
  mov    -0x40(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x6c(%rbp),%eax
L15:
  mov    %rbx,%rsp
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L165
  call   <__stack_chk_fail@plt>
L165:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
int path_within_dir(const char *path, const char *dir) {
  if (!path)
    return 0;
  char absolute_dir[PATH_MAX + 1];
  if (!realpath(dir, absolute_dir))
    return 0;
  char *p;
  if (path[0] == '/') {
    p = strstr(path, absolute_dir);
    if (p != path) {
      return 0;
    }
  }
  char absolute_path[PATH_MAX + 1];
  char *tmp_path = xxstrdup(path);
  int rv = 1;
  while ((p = strrchr(tmp_path, '/')) != NULL) {
    *p = '\0';
    if (realpath(tmp_path, absolute_path)) {
      p = strstr(absolute_path, absolute_dir);
      if (p != absolute_path) {
        rv = 0;
      }
      break;
    } else {
      if (errno != ENOENT) {
        rv = 0;
        break;
      }
    }
  }
  free(tmp_path);
  return rv;
}
```