user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<ASN1_TIME_adj_internal>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %edx,-0x30(%rbp)
  mov    %rcx,-0x38(%rbp)
  mov    %r8d,-0x3c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x1c(%rbp)
  lea    -0x20(%rbp),%rdx
  lea    -0x2c(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <gmtime_r@plt>
  test   %rax,%rax
  jne    L59
  mov    $0x0,%eax
  jmp    L100
L59:
  cmpl   $0x0,-0x30(%rbp)
  jne    L193
  cmpq   $0x0,-0x38(%rbp)
  je     L237
L193:
  mov    -0x38(%rbp),%rdx
  mov    -0x30(%rbp),%ecx
  lea    -0x20(%rbp),%rax
  mov    %ecx,%esi
  mov    %rax,%rdi
  call   <OPENSSL_gmtime_adj@plt>
  test   %eax,%eax
  jne    L237
  mov    $0x0,%eax
  jmp    L100
L237:
  cmpl   $0x81,-0x3c(%rbp)
  je     L71
  cmpl   $0x81,-0x3c(%rbp)
  jg     L1
  cmpl   $0x0,-0x3c(%rbp)
  je     L241
  cmpl   $0x80,-0x3c(%rbp)
  jne    L1
  lea    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <utctime_string_from_tm@plt>
  mov    %rax,-0x18(%rbp)
  jmp    L180
L71:
  lea    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <gentime_string_from_tm@plt>
  mov    %rax,-0x18(%rbp)
  jmp    L180
L241:
  lea    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <rfc5280_string_from_tm@plt>
  mov    %rax,-0x18(%rbp)
  jmp    L180
L1:
  mov    $0x0,%eax
  jmp    L100
L180:
  cmpq   $0x0,-0x18(%rbp)
  jne    L255
  mov    D18(%rip),%rax
  mov    (%rax),%edx
  mov    D13(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <ASN1err@plt>
  mov    $0x0,%eax
  jmp    L100
L255:
  cmpq   $0x0,-0x28(%rbp)
  jne    L187
  mov    $0x0,%eax
  call   <ASN1_TIME_new@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L223
  mov    $0x0,%eax
  jmp    L100
L223:
  movl   $0x1,-0x1c(%rbp)
L187:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x10(%rbp)
  cmpq   $0xd,-0x10(%rbp)
  je     L252
  cmpq   $0xf,-0x10(%rbp)
  jne    L15
  mov    -0x28(%rbp),%rax
  movl   $0x81,(%rax)
  jmp    L25
L252:
  mov    -0x28(%rbp),%rax
  movl   $0x80,(%rax)
  jmp    L25
L15:
  cmpl   $0x0,-0x1c(%rbp)
  je     L125
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <ASN1_TIME_free@plt>
L125:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
  jmp    L100
L25:
  mov    -0x28(%rbp),%rax
  mov    0x8(%rax),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x28(%rbp),%rax
  mov    -0x18(%rbp),%rdx
  mov    %rdx,0x8(%rax)
  mov    -0x28(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rdx,0x10(%rax)
  mov    -0x28(%rbp),%rax
L100:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L191
  call   <__stack_chk_fail@plt>
L191:
  leave
  ret
```

assistant: ```c
ASN1_TIME *ASN1_TIME_adj_internal(ASN1_TIME *s, time_t t, int offset_day, long offset_sec, int mode) {
  int allocated = 0;
  struct tm tm;
  size_t len;
  char *p;
  if (gmtime_r(&t, &tm) == NULL)
    return (NULL);
  if (offset_day || offset_sec) {
    if (!OPENSSL_gmtime_adj(&tm, offset_day, offset_sec))
      return (NULL);
  }
  switch (mode) {
  case V_ASN1_UTCTIME:
    p = utctime_string_from_tm(&tm);
    break;
  case V_ASN1_GENERALIZEDTIME:
    p = gentime_string_from_tm(&tm);
    break;
  case 0:
    p = rfc5280_string_from_tm(&tm);
    break;
  default:
    return (NULL);
  }
  if (p == NULL) {
    ASN1err(ASN1_F_ASN1_GENERALIZEDTIME_ADJ, ASN1_R_ILLEGAL_TIME_VALUE);
    return (NULL);
  }
  if (s == NULL) {
    if ((s = ASN1_TIME_new()) == NULL)
      return (NULL);
    allocated = 1;
  }
  len = strlen(p);
  switch (len) {
  case 15:
    s->type = V_ASN1_GENERALIZEDTIME;
    break;
  case 13:
    s->type = V_ASN1_UTCTIME;
    break;
  default:
    if (allocated)
      ASN1_TIME_free(s);
    free(p);
    return (NULL);
  }
  free(s->data);
  s->data = p;
  s->length = len;
  return (s);
}
```