user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<asn1_template_ex_d2i>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  test   %rdi,%rdi
  je     L16
  mov    %rsi,%r14
  mov    (%rsi),%rsi
  mov    %rcx,%r13
  mov    (%rcx),%ecx
  mov    D41(%rip),%rax
  mov    %rdi,%rbp
  mov    %r9,%rbx
  movsbl %r8b,%r8d
  mov    %rsi,0x20(%rsp)
  mov    D24(%rip),%rsi
  mov    %ecx,%edi
  mov    (%rax),%eax
  and    (%rsi),%edi
  je     L87
  lea    0x16(%rsp),%r10
  and    %ecx,%eax
  lea    0x20(%rsp),%r15
  xor    %esi,%esi
  lea    0x18(%rsp),%rdi
  sub    $0x8,%rsp
  mov    %r10,%rcx
  push   %r9
  mov    %r15,%r9
  push   %r8
  push   %rax
  mov    0x4(%r13),%eax
  push   %rax
  push   %rdx
  xor    %edx,%edx
  lea    0x47(%rsp),%r8
  call   <asn1_check_tlen@plt>
  mov    0x50(%rsp),%r10
  add    $0x30,%rsp
  mov    %eax,%r12d
  test   %eax,%eax
  je     L11
  cmp    $0xffffffff,%eax
  je     L147
  cmpb   $0x0,0x17(%rsp)
  je     L1
  mov    0x18(%rsp),%rdx
  xor    %r8d,%r8d
  mov    %rbx,%r9
  mov    %r13,%rcx
  mov    %r15,%rsi
  mov    %rbp,%rdi
  mov    %r10,0x8(%rsp)
  call   <asn1_template_noexp_d2i@plt>
  mov    0x8(%rsp),%r10
  test   %eax,%eax
  mov    %eax,%r12d
  je     L11
  mov    0x20(%rsp),%rax
  mov    %r10,%rsi
  sub    %rax,%rsi
  add    0x18(%rsp),%rsi
  cmpb   $0x0,0x16(%rsp)
  mov    %rsi,0x18(%rsp)
  jne    L126
  test   %rsi,%rsi
  jne    L71
L24:
  mov    %rax,(%r14)
  mov    $0x1,%r12d
  nopl   0x0(%rax,%rax,1)
L147:
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L148
  add    $0x38,%rsp
  mov    %r12d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  xchg   %ax,%ax
L87:
  mov    %r13,%rcx
  mov    %r14,%rsi
  mov    %rbp,%rdi
  call   <asn1_template_noexp_d2i@plt>
  mov    %eax,%r12d
  jmp    L147
  nopl   0x0(%rax,%rax,1)
L11:
  mov    D7(%rip),%rax
  mov    (%rax),%esi
  mov    D42(%rip),%rax
  mov    (%rax),%edi
  call   <ASN1err@plt>
  jmp    L147
  nopl   0x0(%rax)
L16:
  xor    %r12d,%r12d
  jmp    L147
  nopl   (%rax)
L1:
  mov    D25(%rip),%rax
  xor    %r12d,%r12d
  mov    (%rax),%esi
  mov    D42(%rip),%rax
  mov    (%rax),%edi
  call   <ASN1err@plt>
  jmp    L147
  nop
L126:
  mov    %r15,%rdi
  call   <asn1_check_eoc@plt>
  mov    %eax,%r8d
  mov    0x20(%rsp),%rax
  test   %r8d,%r8d
  jne    L24
  mov    D8(%rip),%rax
  mov    (%rax),%esi
  mov    D42(%rip),%rax
  mov    (%rax),%edi
  call   <ASN1err@plt>
L115:
  mov    %r13,%rsi
  mov    %rbp,%rdi
  xor    %r12d,%r12d
  call   <ASN1_template_free@plt>
  movq   $0x0,0x0(%rbp)
  jmp    L147
  nopl   0x0(%rax,%rax,1)
L71:
  mov    D13(%rip),%rax
  mov    (%rax),%esi
  mov    D42(%rip),%rax
  mov    (%rax),%edi
  call   <ASN1err@plt>
  jmp    L115
L148:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int asn1_template_ex_d2i(ASN1_VALUE **val, const unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx) {
  int flags, aclass;
  int ret;
  long len;
  const unsigned char *p, *q;
  char exp_eoc;
  if (!val)
    return 0;
  flags = tt->flags;
  aclass = flags & ASN1_TFLG_TAG_CLASS;
  p = *in;
  if (flags & ASN1_TFLG_EXPTAG) {
    char cst;
    ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, &p, inlen, tt->tag, aclass, opt, ctx);
    q = p;
    if (!ret) {
      ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
      return 0;
    } else if (ret == -1)
      return -1;
    if (!cst) {
      ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
      return 0;
    }
    ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
    if (!ret) {
      ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
      return 0;
    }
    len -= p - q;
    if (exp_eoc) {
      if (!asn1_check_eoc(&p, len)) {
        ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_MISSING_EOC);
        goto err;
      }
    } else {
      if (len) {
        ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_EXPLICIT_LENGTH_MISMATCH);
        goto err;
      }
    }
  } else
    return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
  *in = p;
  return 1;
err:
  ASN1_template_free(val, tt);
  *val = NULL;
  return 0;
}
```