user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<buffered_line_reader>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x68(%rbp)
  mov    %esi,-0x6c(%rbp)
  mov    %edx,-0x70(%rbp)
  mov    %rcx,-0x78(%rbp)
  mov    %r8,-0x80(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x28(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  movl   $0x50,-0x4c(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  sub    $0x1,%rax
  mov    %rax,-0x40(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  mov    %rax,%r12
  mov    $0x0,%r13d
  mov    -0x4c(%rbp),%eax
  cltq
  mov    %rax,%r10
  mov    $0x0,%r11d
  mov    -0x4c(%rbp),%eax
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L60:
  cmp    %rdx,%rsp
  je     L74
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L60
L74:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L91
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L91:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x38(%rbp)
  movl   $0x1,-0x48(%rbp)
  movl   $0x0,-0x54(%rbp)
  mov    -0x6c(%rbp),%eax
  mov    %eax,-0x50(%rbp)
  movl   $0x0,-0x58(%rbp)
  jmp    L43
L111:
  mov    -0x38(%rbp),%rdx
  mov    -0x58(%rbp),%eax
  cltq
  movb   $0x20,(%rdx,%rax,1)
  addl   $0x1,-0x58(%rbp)
L43:
  mov    -0x58(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L111
L184:
  mov    -0x68(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %eax,-0x44(%rbp)
  mov    D4(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x44(%rbp)
  je     L7
  mov    -0x44(%rbp),%eax
  mov    %al,-0x59(%rbp)
  cmpb   $0xa,-0x59(%rbp)
  jne    L88
  addl   $0x1,-0x50(%rbp)
L88:
  mov    -0x54(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x54(%rbp)
  mov    -0x44(%rbp),%edx
  mov    %edx,%ecx
  mov    -0x38(%rbp),%rdx
  cltq
  mov    %cl,(%rdx,%rax,1)
  mov    -0x54(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jge    L9
  mov    -0x50(%rbp),%eax
  cmp    -0x70(%rbp),%eax
  jl     L184
  jmp    L9
L7:
  nop
L9:
  mov    -0x78(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x54(%rbp),%eax
  add    %edx,%eax
  add    $0x1,%eax
  mov    $0x1,%esi
  mov    %eax,%edi
  call   <calloc@plt>
  mov    %rax,-0x30(%rbp)
  movl   $0x0,-0x58(%rbp)
  jmp    L14
L168:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  movb   $0x20,(%rax)
  addl   $0x1,-0x58(%rbp)
L14:
  mov    -0x78(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x54(%rbp),%eax
  add    %edx,%eax
  cmp    %eax,-0x58(%rbp)
  jle    L168
  movl   $0x0,-0x58(%rbp)
  jmp    L55
L106:
  mov    -0x58(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  mov    -0x58(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x30(%rbp),%rdx
  add    %rcx,%rdx
  movzbl (%rax),%eax
  mov    %al,(%rdx)
  addl   $0x1,-0x58(%rbp)
L55:
  mov    -0x78(%rbp),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x58(%rbp)
  jl     L106
  movl   $0x0,-0x58(%rbp)
  jmp    L23
L8:
  mov    -0x78(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x58(%rbp),%eax
  add    %edx,%eax
  movslq %eax,%rdx
  mov    -0x30(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x38(%rbp),%rdx
  mov    -0x58(%rbp),%eax
  cltq
  movzbl (%rdx,%rax,1),%eax
  mov    %al,(%rcx)
  addl   $0x1,-0x58(%rbp)
L23:
  mov    -0x58(%rbp),%eax
  cmp    -0x54(%rbp),%eax
  jl     L8
  mov    -0x78(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x54(%rbp),%eax
  add    %eax,%edx
  mov    -0x78(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x78(%rbp),%rax
  mov    (%rax),%eax
  movslq %eax,%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    -0x50(%rbp),%eax
  cmp    -0x70(%rbp),%eax
  jge    L38
  mov    -0x30(%rbp),%rdi
  mov    -0x78(%rbp),%rcx
  mov    -0x70(%rbp),%edx
  mov    -0x50(%rbp),%esi
  mov    -0x68(%rbp),%rax
  mov    %rdi,%r8
  mov    %rax,%rdi
  call   <buffered_line_reader>
  jmp    L17
L38:
  mov    -0x80(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x30(%rbp),%rax
L17:
  mov    %rbx,%rsp
  mov    -0x28(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L103
  call   <__stack_chk_fail@plt>
L103:
  lea    -0x18(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %rbp
  ret
```

assistant: ```c
char *buffered_line_reader(FILE *fp, int k, int n, int *len, char *accu) {
  const int SIZE = 80;
  char *result;
  char buffer[SIZE];
  char c;
  int i;
  int go_on = 1;
  int idx = 0;
  int cnt = k;
  for (i = 0; i < SIZE; i++)
    buffer[i] = ' ';
  do {
    int rc = fgetc(fp);
    if (rc == EOF)
      break;
    c = (char)rc;
    if (c == '\n')
      cnt = cnt + 1;
    buffer[idx++] = (char)rc;
  } while ((idx < SIZE) && (cnt < n));
  result = (char *)calloc(*len + idx + 1, sizeof(char));
  for (i = 0; i < *len + idx + 1; i++)
    result[i] = ' ';
  for (i = 0; i < *len; i++)
    result[i] = accu[i];
  for (i = 0; i < idx; i++)
    result[*len + i] = buffer[i];
  *len = *len + idx;
  result[*len] = '\0';
  if (cnt < n)
    return buffered_line_reader(fp, cnt, n, len, result);
  else {
    free(accu);
    return result;
  }
}
```