user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<do_b2i_bio>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %esi,-0x5c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movq   $0x0,-0x28(%rbp)
  movq   $0x0,-0x30(%rbp)
  lea    -0x20(%rbp),%rcx
  mov    -0x58(%rbp),%rax
  mov    $0x10,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <BIO_read@plt>
  cmp    $0x10,%eax
  je     L85
  mov    D59(%rip),%rax
  mov    (%rax),%edx
  mov    D28(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <PEMerr@plt>
  mov    $0x0,%eax
  jmp    L38
L85:
  lea    -0x20(%rbp),%rax
  mov    %rax,-0x38(%rbp)
  lea    -0x5c(%rbp),%rdi
  lea    -0x40(%rbp),%rsi
  lea    -0x48(%rbp),%rcx
  lea    -0x44(%rbp),%rdx
  lea    -0x38(%rbp),%rax
  mov    %rdi,%r9
  mov    %rsi,%r8
  mov    $0x10,%esi
  mov    %rax,%rdi
  call   <do_blob_header@plt>
  test   %rax,%rax
  jg     L18
  mov    $0x0,%eax
  jmp    L38
L18:
  mov    -0x5c(%rbp),%edx
  mov    -0x40(%rbp),%ecx
  mov    -0x48(%rbp),%eax
  mov    %ecx,%esi
  mov    %eax,%edi
  call   <blob_length@plt>
  mov    %eax,-0x3c(%rbp)
  mov    -0x3c(%rbp),%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L76
  mov    D45(%rip),%rax
  mov    (%rax),%edx
  mov    D28(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <PEMerr@plt>
  jmp    L71
L76:
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x38(%rbp)
  mov    -0x3c(%rbp),%edx
  mov    -0x28(%rbp),%rcx
  mov    -0x58(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <BIO_read@plt>
  mov    -0x3c(%rbp),%edx
  cmp    %edx,%eax
  je     L89
  mov    D59(%rip),%rax
  mov    (%rax),%edx
  mov    D28(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <PEMerr@plt>
  jmp    L71
L89:
  mov    -0x40(%rbp),%eax
  test   %eax,%eax
  je     L61
  mov    -0x5c(%rbp),%ecx
  mov    -0x48(%rbp),%edx
  mov    -0x3c(%rbp),%esi
  lea    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <b2i_dss@plt>
  mov    %rax,-0x30(%rbp)
  jmp    L71
L61:
  mov    -0x5c(%rbp),%ecx
  mov    -0x48(%rbp),%edx
  mov    -0x3c(%rbp),%esi
  lea    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <b2i_rsa@plt>
  mov    %rax,-0x30(%rbp)
L71:
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x30(%rbp),%rax
L38:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L32
  call   <__stack_chk_fail@plt>
L32:
  leave
  ret
```

assistant: ```c
EVP_PKEY *do_b2i_bio(BIO *in, int ispub) {
  const unsigned char *p;
  unsigned char hdr_buf[16], *buf = NULL;
  unsigned int bitlen, magic, length;
  int isdss;
  EVP_PKEY *ret = NULL;
  if (BIO_read(in, hdr_buf, 16) != 16) {
    PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
    return NULL;
  }
  p = hdr_buf;
  if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
    return NULL;
  length = blob_length(bitlen, isdss, ispub);
  buf = malloc(length);
  if (!buf) {
    PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE);
    goto err;
  }
  p = buf;
  if (BIO_read(in, buf, length) != (int)length) {
    PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
    goto err;
  }
  if (isdss)
    ret = b2i_dss(&p, length, bitlen, ispub);
  else
    ret = b2i_rsa(&p, length, bitlen, ispub);
err:
  free(buf);
  return ret;
}
```