user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<read_fv>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    -0x24(%rbp),%rsi
  lea    -0x28(%rbp),%rcx
  lea    -0x20(%rbp),%rdx
  mov    -0x38(%rbp),%rax
  mov    %rsi,%r8
  mov    $0x2f,%esi
  mov    %rax,%rdi
  call   <strsplit@plt>
  mov    -0x28(%rbp),%eax
  test   %eax,%eax
  setne  %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x20(%rbp),%rax
  mov    -0x40(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <to_int@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x40(%rbp),%rax
  add    $0x4,%rax
  movl   $0x0,(%rax)
  mov    -0x40(%rbp),%rax
  add    $0x8,%rax
  movl   $0x0,(%rax)
  mov    -0x24(%rbp),%eax
  cmp    $0x2,%eax
  je     L63
  cmp    $0x2,%eax
  ja     L58
  test   %eax,%eax
  je     L105
  cmp    $0x1,%eax
  jne    L58
  mov    -0x28(%rbp),%eax
  cmp    $0x1,%eax
  seta   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x40(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <to_int@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  jmp    L6
L63:
  mov    -0x28(%rbp),%eax
  cmp    $0x2,%eax
  je     L104
  cmp    $0x3,%eax
  je     L8
  jmp    L35
L104:
  mov    -0x28(%rbp),%eax
  cmp    $0x1,%eax
  seta   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x40(%rbp),%rax
  lea    0x8(%rax),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <to_int@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  jmp    L31
L8:
  mov    -0x28(%rbp),%eax
  cmp    $0x2,%eax
  seta   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x40(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <to_int@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x40(%rbp),%rax
  lea    0x8(%rax),%rdx
  mov    -0x10(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <to_int@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  jmp    L31
L35:
  mov    $0x0,%edi
  call   <assert@plt>
  jmp    L6
L31:
  jmp    L6
L58:
  mov    $0x0,%edi
  call   <assert@plt>
  jmp    L6
L105:
  nop
L6:
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L135
  call   <__stack_chk_fail@plt>
L135:
  leave
  ret
```

assistant: ```c
int read_fv(const char *str, int fv[3]) {
  unsigned int segs_size;
  unsigned int slashes;
  const char *segs[3];
  strsplit(str, '/', segs, &segs_size, &slashes);
  assert(segs_size >= 1);
  assert(!to_int(segs[0], &fv[0]));
  fv[1] = 0;
  fv[2] = 0;
  switch (slashes) {
  case 0:
    break;
  case 1:
    assert(segs_size >= 2);
    assert(!to_int(segs[1], &fv[1]));
    break;
  case 2:
    switch (segs_size) {
    case 2:
      assert(segs_size >= 2);
      assert(!to_int(segs[1], &fv[2]));
      break;
    case 3:
      assert(segs_size >= 3);
      assert(!to_int(segs[1], &fv[1]));
      assert(!to_int(segs[2], &fv[2]));
      break;
    default:
      assert(0);
    }
    break;
  default:
    assert(0);
  }
  return 0;
}
```