user: Demonstrate the C code that generates the assembly output below:

```asm
<s2i_ASN1_INTEGER>:
  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
  movq   $0x0,-0x18(%rbp)
  cmpq   $0x0,-0x40(%rbp)
  jne    L121
  mov    D2(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,%edi
  call   <X509V3error@plt>
  mov    $0x0,%eax
  jmp    L31
L121:
  mov    $0x0,%eax
  call   <BN_new@plt>
  mov    %rax,-0x18(%rbp)
  mov    -0x40(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2d,%al
  jne    L91
  addq   $0x1,-0x40(%rbp)
  movl   $0x1,-0x24(%rbp)
  jmp    L45
L91:
  movl   $0x0,-0x24(%rbp)
L45:
  mov    -0x40(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x30,%al
  jne    L76
  mov    -0x40(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0x78,%al
  je     L20
  mov    -0x40(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0x58,%al
  jne    L76
L20:
  addq   $0x2,-0x40(%rbp)
  movl   $0x1,-0x20(%rbp)
  jmp    L71
L76:
  movl   $0x0,-0x20(%rbp)
L71:
  cmpl   $0x0,-0x20(%rbp)
  je     L28
  mov    -0x40(%rbp),%rdx
  lea    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <BN_hex2bn@plt>
  mov    %eax,-0x1c(%rbp)
  jmp    L14
L28:
  mov    -0x40(%rbp),%rdx
  lea    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <BN_dec2bn@plt>
  mov    %eax,-0x1c(%rbp)
L14:
  cmpl   $0x0,-0x1c(%rbp)
  je     L69
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L15
L69:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <BN_free@plt>
  mov    D9(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,%edi
  call   <X509V3error@plt>
  mov    $0x0,%eax
  jmp    L31
L15:
  cmpl   $0x0,-0x24(%rbp)
  je     L136
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <BN_is_zero@plt>
  test   %rax,%rax
  je     L136
  movl   $0x0,-0x24(%rbp)
L136:
  mov    -0x18(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <BN_to_ASN1_INTEGER@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <BN_free@plt>
  cmpq   $0x0,-0x10(%rbp)
  jne    L120
  mov    D24(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,%edi
  call   <X509V3error@plt>
  mov    $0x0,%eax
  jmp    L31
L120:
  cmpl   $0x0,-0x24(%rbp)
  je     L64
  mov    -0x10(%rbp),%rax
  mov    (%rax),%edx
  mov    D18(%rip),%rax
  mov    (%rax),%eax
  or     %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,(%rax)
L64:
  mov    -0x10(%rbp),%rax
L31:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L181
  call   <__stack_chk_fail@plt>
L181:
  leave
  ret
```

assistant: ```c
ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value) {
  BIGNUM *bn = NULL;
  ASN1_INTEGER *aint;
  int isneg, ishex;
  int ret;
  if (!value) {
    X509V3error(X509V3_R_INVALID_NULL_VALUE);
    return 0;
  }
  bn = BN_new();
  if (value[0] == '-') {
    value++;
    isneg = 1;
  } else
    isneg = 0;
  if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
    value += 2;
    ishex = 1;
  } else
    ishex = 0;
  if (ishex)
    ret = BN_hex2bn(&bn, value);
  else
    ret = BN_dec2bn(&bn, value);
  if (!ret || value[ret]) {
    BN_free(bn);
    X509V3error(X509V3_R_BN_DEC2BN_ERROR);
    return 0;
  }
  if (isneg && BN_is_zero(bn))
    isneg = 0;
  aint = BN_to_ASN1_INTEGER(bn, NULL);
  BN_free(bn);
  if (!aint) {
    X509V3error(X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
    return 0;
  }
  if (isneg)
    aint->type |= V_ASN1_NEG;
  return aint;
}
```