user: 下面的汇编指令对应的C源代码是什么:

```asm
<buffered_line_reader>:
  endbr64
  push   %r15
  mov    %esi,%r15d
  push   %r14
  push   %r13
  push   %r12
  mov    %r8,%r12
  push   %rbp
  mov    %rcx,%rbp
  push   %rbx
  sub    $0x98,%rsp
  mov    %rdi,0x20(%rsp)
  lea    0x30(%rsp),%rbx
  mov    %edx,(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x88(%rsp)
  xor    %eax,%eax
  lea    0x2f(%rsp),%rax
  mov    %rax,0x28(%rsp)
L82:
  mov    $0x1,%r14d
  mov    %rbp,0x8(%rsp)
  mov    0x20(%rsp),%r13
  movabs $0x2020202020202020,%rax
  movabs $0x2020202020202020,%rdx
  mov    %rax,(%rbx)
  mov    %r14,%rbp
  mov    (%rsp),%r14d
  mov    %rdx,0x8(%rbx)
  mov    %rax,0x10(%rbx)
  mov    %rdx,0x18(%rbx)
  mov    %rax,0x20(%rbx)
  mov    %rdx,0x28(%rbx)
  mov    %rax,0x30(%rbx)
  mov    %rdx,0x38(%rbx)
  mov    %rax,0x40(%rbx)
  mov    %rdx,0x48(%rbx)
  mov    %r12,0x10(%rsp)
  mov    %r15d,%r12d
  mov    %rbx,0x18(%rsp)
  mov    0x28(%rsp),%rbx
  jmp    L90
  xchg   %ax,%ax
L36:
  xor    %esi,%esi
  cmp    $0xa,%al
  mov    %al,(%rbx,%rbp,1)
  mov    %ebp,%r15d
  sete   %sil
  add    %esi,%r12d
  cmp    $0x4f,%ebp
  setle  %dil
  cmp    %r14d,%r12d
  setl   %al
  add    $0x1,%rbp
  test   %al,%dil
  je     L38
L90:
  mov    %r13,%rdi
  lea    -0x1(%rbp),%r15d
  call   <fgetc@plt>
  mov    D6(%rip),%rsi
  cmp    %eax,(%rsi)
  jne    L36
L38:
  mov    0x8(%rsp),%rbp
  mov    %r15d,%r13d
  mov    $0x1,%esi
  mov    %r12d,%r15d
  mov    0x18(%rsp),%rbx
  mov    0x10(%rsp),%r12
  mov    0x0(%rbp),%edi
  add    %r13d,%edi
  add    $0x1,%edi
  call   <calloc@plt>
  mov    %r13d,%ecx
  mov    %rax,%r9
  mov    0x0(%rbp),%eax
  add    %eax,%ecx
  js     L72
  xor    %edx,%edx
  nopl   (%rax)
L108:
  movb   $0x20,(%r9,%rdx,1)
  mov    0x0(%rbp),%eax
  add    $0x1,%rdx
  lea    (%rax,%r13,1),%ecx
  cmp    %edx,%ecx
  jge    L108
L72:
  test   %eax,%eax
  jle    L102
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L58:
  movzbl (%r12,%rdx,1),%eax
  mov    %al,(%r9,%rdx,1)
  mov    0x0(%rbp),%eax
  add    $0x1,%rdx
  cmp    %edx,%eax
  jg     L58
L102:
  test   %r13d,%r13d
  je     L49
  movslq %r13d,%rdi
  xor    %edx,%edx
  cs nopw 0x0(%rax,%rax,1)
L117:
  movzbl (%rbx,%rdx,1),%ecx
  add    %edx,%eax
  add    $0x1,%rdx
  cltq
  mov    %cl,(%r9,%rax,1)
  mov    0x0(%rbp),%eax
  cmp    %rdx,%rdi
  jne    L117
L49:
  add    %eax,%r13d
  mov    %r13d,0x0(%rbp)
  movslq %r13d,%r13
  movb   $0x0,(%r9,%r13,1)
  cmp    (%rsp),%r15d
  jl     L93
  mov    %r12,%rdi
  mov    %r9,(%rsp)
  call   <free@plt>
  mov    (%rsp),%r9
  mov    0x88(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L56
  add    $0x98,%rsp
  mov    %r9,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
L93:
  mov    %r9,%r12
  jmp    L82
L56:
  call   <__stack_chk_fail@plt>
```

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;
  }
}
```