user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<walk>:
  endbr64
  movslq %esi,%rax
  push   %r15
  movslq %edx,%r15
  push   %r13
  xor    %r13d,%r13d
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rax,%rbx
  shl    $0x5,%rbx
  add    %rax,%rbx
  add    %rdi,%rbx
  sub    $0x10,%rsp
  cmpb   $0x0,(%rbx,%r15,1)
  jne    L82
  lea    -0x1(%rcx),%r8d
  movb   $0x2,(%rbx,%r15,1)
  mov    %rax,%r12
  mov    %r15,%rbp
  cmp    %eax,%r8d
  jg     L14
L100:
  test   %r12d,%r12d
  jle    L193
  movzbl -0x21(%rbx,%r15,1),%eax
  cmp    $0x1,%al
  je     L183
  test   %al,%al
  jne    L193
  lea    -0x1(%r12),%esi
  mov    %ebp,%edx
  mov    %r8d,0xc(%rsp)
  mov    %ecx,0x8(%rsp)
  mov    %rdi,(%rsp)
  call   <walk>
  mov    0xc(%rsp),%r8d
  mov    0x8(%rsp),%ecx
  mov    (%rsp),%rdi
  add    %eax,%r13d
  nopl   0x0(%rax)
L193:
  cmp    %ebp,%r8d
  jle    L177
  lea    0x1(%rbp),%edx
  movslq %edx,%rax
  movzbl (%rbx,%rax,1),%eax
  cmp    $0x1,%al
  je     L195
  test   %al,%al
  jne    L177
  mov    %r12d,%esi
  mov    %r8d,0xc(%rsp)
  mov    %ecx,0x8(%rsp)
  mov    %rdi,(%rsp)
  call   <walk>
  mov    0xc(%rsp),%r8d
  mov    0x8(%rsp),%ecx
  mov    (%rsp),%rdi
  add    %eax,%r13d
L177:
  test   %ebp,%ebp
  jle    L199
  lea    -0x1(%rbp),%edx
  movslq %edx,%rax
  movzbl (%rbx,%rax,1),%eax
  cmp    $0x1,%al
  je     L58
  test   %al,%al
  jne    L199
  mov    %r12d,%esi
  mov    %r8d,(%rsp)
  call   <walk>
  mov    (%rsp),%r8d
  add    %eax,%r13d
  nopl   (%rax)
L199:
  test   %r12d,%r12d
  jne    L190
  test   %ebp,%ebp
  je     L190
  add    $0x1,%r13d
L115:
  cmp    %ebp,%r8d
  jne    L82
  cmp    %r12d,%r8d
  setne  %al
  cmp    $0x1,%al
  sbb    $0xffffffff,%r13d
L82:
  add    $0x10,%rsp
  mov    %r13d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r15
  ret
  xchg   %ax,%ax
L14:
  movzbl 0x21(%rbx,%r15,1),%eax
  mov    $0x1,%r13d
  cmp    $0x1,%al
  je     L100
  xor    %r13d,%r13d
  test   %al,%al
  jne    L100
  lea    0x1(%r12),%esi
  mov    %r15d,%edx
  mov    %r8d,0xc(%rsp)
  mov    %ecx,0x8(%rsp)
  mov    %rdi,(%rsp)
  call   <walk>
  mov    0xc(%rsp),%r8d
  mov    0x8(%rsp),%ecx
  mov    (%rsp),%rdi
  mov    %eax,%r13d
  jmp    L100
  xchg   %ax,%ax
L190:
  test   %r12d,%r12d
  setne  %al
  test   %ebp,%ebp
  sete   %dl
  and    %edx,%eax
  cmp    %ebp,%r8d
  je     L164
  cmp    %r12d,%r8d
  je     L238
L164:
  test   %al,%al
  je     L115
L25:
  add    $0x10,%rsp
  add    $0x1,%r13d
  pop    %rbx
  mov    %r13d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L183:
  add    $0x1,%r13d
  jmp    L193
  nopl   0x0(%rax)
L58:
  add    $0x1,%r13d
  jmp    L199
  nopl   0x0(%rax)
L195:
  add    $0x1,%r13d
  jmp    L177
  nopl   0x0(%rax)
L238:
  add    $0x1,%r13d
  test   %al,%al
  jne    L25
  jmp    L82
```

assistant: ```c
int walk(char maze[][33], int lin, int col, int n) {
  int walls = 0;
  if (!maze[lin][col]) {
    maze[lin][col] = 2;
    if (lin < n - 1) {
      if (maze[lin + 1][col] == 1)
        walls++;
      else if (!maze[lin + 1][col])
        walls += walk(maze, lin + 1, col, n);
    }
    if (lin > 0) {
      if (maze[lin - 1][col] == 1)
        walls++;
      else if (!maze[lin - 1][col])
        walls += walk(maze, lin - 1, col, n);
    }
    if (col < n - 1) {
      if (maze[lin][col + 1] == 1)
        walls++;
      else if (!maze[lin][col + 1])
        walls += walk(maze, lin, col + 1, n);
    }
    if (col > 0) {
      if (maze[lin][col - 1] == 1)
        walls++;
      else if (!maze[lin][col - 1])
        walls += walk(maze, lin, col - 1, n);
    }
    if (lin == 0 && col != 0)
      walls++;
    else if (lin == n - 1 && col != n - 1)
      walls++;
    if (col == 0 && lin != 0)
      walls++;
    else if (col == n - 1 && lin != n - 1)
      walls++;
  }
  return walls;
}
```