user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<parse_prefs_line>:
  endbr64
  push   %r15
  mov    %rcx,%r15
  push   %r14
  push   %r13
  mov    %r8,%r13
  push   %r12
  mov    %rdx,%r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  mov    %rsi,%rbx
  sub    $0x18,%rsp
  mov    (%rdi),%r14
  mov    %r9,0x8(%rsp)
  movsbl (%r14),%edi
  cmp    $0xa,%dil
  jne    L148
  jmp    L126
  nopl   (%rax)
L350:
  movsbl 0x1(%r14),%edi
  add    $0x1,%r14
  cmp    $0xa,%dil
  je     L126
L148:
  call   <isspace@plt>
  test   %rax,%rax
  jne    L350
L126:
  mov    %r14,(%rbx)
  jmp    L318
  cs nopw 0x0(%rax,%rax,1)
L290:
  add    $0x1,%r14
L318:
  movsbl (%r14),%edi
  call   <isspace@plt>
  test   %rax,%rax
  je     L290
  cmpb   $0xa,(%r14)
  je     L195
  movsbl 0x1(%r14),%edi
  movb   $0x0,(%r14)
  lea    0x1(%r14),%rbx
  cmp    $0xa,%dil
  jne    L409
  jmp    L215
  nopl   0x0(%rax)
L311:
  movsbl 0x1(%rbx),%edi
  add    $0x1,%rbx
  cmp    $0xa,%dil
  je     L215
L409:
  call   <isspace@plt>
  test   %rax,%rax
  jne    L311
L215:
  mov    %rbx,(%r12)
  jmp    L346
  cs nopw 0x0(%rax,%rax,1)
L62:
  add    $0x1,%rbx
L346:
  movsbl (%rbx),%edi
  call   <isspace@plt>
  test   %rax,%rax
  je     L62
  cmpb   $0xa,(%rbx)
  je     L195
  movsbl 0x1(%rbx),%edi
  movb   $0x0,(%rbx)
  lea    0x1(%rbx),%r12
  cmp    $0xa,%dil
  jne    L105
  jmp    L53
  nopl   (%rax)
L291:
  movsbl 0x1(%r12),%edi
  add    $0x1,%r12
  cmp    $0xa,%dil
  je     L53
L105:
  call   <isspace@plt>
  test   %rax,%rax
  jne    L291
L53:
  mov    %r12,(%r15)
  jmp    L183
  nop
L6:
  add    $0x1,%r12
L183:
  movsbl (%r12),%edi
  call   <isspace@plt>
  test   %rax,%rax
  je     L6
  cmpb   $0xa,(%r12)
  je     L195
  movsbl 0x1(%r12),%edi
  movb   $0x0,(%r12)
  lea    0x1(%r12),%r15
  cmp    $0xa,%dil
  jne    L265
  jmp    L361
  cs nopw 0x0(%rax,%rax,1)
L2:
  movsbl 0x1(%r15),%edi
  add    $0x1,%r15
  cmp    $0xa,%dil
  je     L361
L265:
  call   <isspace@plt>
  test   %rax,%rax
  jne    L2
L361:
  mov    %r15,0x0(%r13)
  jmp    L299
  nop
L19:
  add    $0x1,%r15
L299:
  movsbl (%r15),%edi
  call   <isspace@plt>
  test   %rax,%rax
  je     L19
  cmpb   $0xa,(%r15)
  je     L195
  movsbl 0x1(%r15),%edi
  movb   $0x0,(%r15)
  lea    0x1(%r15),%rbx
  cmp    $0xa,%dil
  jne    L293
  jmp    L195
  nopl   0x0(%rax)
L85:
  movsbl 0x1(%rbx),%edi
  add    $0x1,%rbx
  cmp    $0xa,%dil
  je     L195
L293:
  call   <isspace@plt>
  test   %rax,%rax
  jne    L85
  cmpb   $0xa,(%rbx)
  je     L195
  mov    0x8(%rsp),%rax
  mov    %rbx,(%rax)
  nopl   0x0(%rax)
L237:
  movsbl (%rbx),%edi
  call   <isspace@plt>
  mov    %rbx,%rdx
  add    $0x1,%rbx
  test   %rax,%rax
  je     L237
  cmpb   $0xa,(%rdx)
  je     L160
  movsbl 0x1(%rdx),%edi
  movb   $0x0,(%rdx)
  cmp    $0xa,%dil
  jne    L90
  jmp    L269
L95:
  movsbl 0x1(%rbx),%edi
  add    $0x1,%rbx
  cmp    $0xa,%dil
  je     L269
L90:
  call   <isspace@plt>
  test   %rax,%rax
  jne    L95
  cmpb   $0xa,(%rbx)
  jne    L195
L269:
  mov    %rbx,%rdx
L160:
  movb   $0x0,(%rdx)
  add    $0x1,%rdx
  xor    %eax,%eax
  mov    %rdx,0x0(%rbp)
L213:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L195:
  mov    $0xffffffff,%eax
  jmp    L213
```

assistant: ```c
int parse_prefs_line(char **start_ptr, char **qid_ptr, char **jg_ptr, char **jsg_ptr, char **docno_ptr, char **rel_ptr) {
  char *ptr = *start_ptr;
  while (*ptr != '\n' && isspace(*ptr))
    ptr++;
  *qid_ptr = ptr;
  while (!isspace(*ptr))
    ptr++;
  if (*ptr == '\n')
    return (-1);
  *ptr++ = '\0';
  while (*ptr != '\n' && isspace(*ptr))
    ptr++;
  *jg_ptr = ptr;
  while (!isspace(*ptr))
    ptr++;
  if (*ptr == '\n')
    return (-1);
  *ptr++ = '\0';
  while (*ptr != '\n' && isspace(*ptr))
    ptr++;
  *jsg_ptr = ptr;
  while (!isspace(*ptr))
    ptr++;
  if (*ptr == '\n')
    return (-1);
  *ptr++ = '\0';
  while (*ptr != '\n' && isspace(*ptr))
    ptr++;
  *docno_ptr = ptr;
  while (!isspace(*ptr))
    ptr++;
  if (*ptr == '\n')
    return (-1);
  *ptr++ = '\0';
  while (*ptr != '\n' && isspace(*ptr))
    ptr++;
  if (*ptr == '\n')
    return (-1);
  *rel_ptr = ptr;
  while (!isspace(*ptr))
    ptr++;
  if (*ptr != '\n') {
    *ptr++ = '\0';
    while (*ptr != '\n' && isspace(*ptr))
      ptr++;
    if (*ptr != '\n')
      return (-1);
  }
  *ptr++ = '\0';
  *start_ptr = ptr;
  return (0);
}
```