user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<__getgrent>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %edi,-0x34(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
L67:
  mov    -0x34(%rbp),%eax
  mov    $0x80,%edx
  lea    D177(%rip),%rcx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <read@plt>
  mov    %eax,-0x24(%rbp)
  cmpl   $0x0,-0x24(%rbp)
  jg     L246
  mov    $0x0,%eax
  jmp    L20
L246:
  mov    $0xa,%esi
  lea    D177(%rip),%rax
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L26
  mov    D14(%rip),%rax
  mov    (%rax),%edx
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    -0x24(%rbp),%eax
  cltq
  lea    D177(%rip),%rsi
  add    %rsi,%rax
  sub    %rax,%rcx
  mov    -0x34(%rbp),%eax
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <lseek@plt>
  movzbl D177(%rip),%eax
  cmp    $0x23,%al
  je     L67
  jmp    L214
L26:
  mov    -0x34(%rbp),%eax
  mov    $0x80,%edx
  lea    D177(%rip),%rcx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <read@plt>
  mov    %eax,-0x24(%rbp)
  cmpl   $0x0,-0x24(%rbp)
  jg     L238
  mov    $0x0,%eax
  jmp    L20
L238:
  mov    $0xa,%esi
  lea    D177(%rip),%rax
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x10(%rbp)
  je     L26
  mov    D14(%rip),%rax
  mov    (%rax),%edx
  lea    D177(%rip),%rsi
  mov    -0x10(%rbp),%rax
  sub    %rsi,%rax
  mov    %rax,%rcx
  mov    -0x24(%rbp),%eax
  movslq %eax,%rsi
  mov    %rcx,%rax
  sub    %rsi,%rax
  lea    0x1(%rax),%rcx
  mov    -0x34(%rbp),%eax
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <lseek@plt>
  jmp    L67
L214:
  movzbl D177(%rip),%eax
  cmp    $0x20,%al
  je     L67
  movzbl D177(%rip),%eax
  cmp    $0xa,%al
  je     L67
  movzbl D177(%rip),%eax
  cmp    $0x9,%al
  jne    L198
  jmp    L67
L198:
  mov    -0x10(%rbp),%rax
  movb   $0x0,(%rax)
  lea    D177(%rip),%rax
  mov    %rax,D143(%rip)
  mov    $0x3a,%esi
  lea    D177(%rip),%rax
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L154
  jmp    L67
L154:
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movb   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  mov    %rax,D73(%rip)
  mov    -0x18(%rbp),%rax
  mov    $0x3a,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L72
  jmp    L67
L72:
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movb   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x18(%rbp),%rax
  mov    $0x3a,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L69
  jmp    L67
L69:
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movb   $0x0,(%rax)
  lea    -0x20(%rbp),%rcx
  mov    -0x10(%rbp),%rax
  mov    $0xa,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strtoul@plt>
  mov    %rax,D225(%rip)
  mov    -0x20(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L241
  jmp    L67
L241:
  movl   $0x0,-0x28(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  jmp    L8
L94:
  mov    -0x18(%rbp),%rax
  movb   $0x0,(%rax)
  addq   $0x1,-0x18(%rbp)
  mov    -0x28(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rcx
  lea    D10(%rip),%rdx
  mov    -0x10(%rbp),%rax
  mov    %rax,(%rcx,%rdx,1)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  addl   $0x1,-0x28(%rbp)
L8:
  mov    -0x18(%rbp),%rax
  mov    $0x2c,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L94
  mov    -0x10(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L88
  mov    -0x28(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  lea    D10(%rip),%rax
  movq   $0x0,(%rdx,%rax,1)
  jmp    L164
L88:
  mov    -0x28(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rcx
  lea    D10(%rip),%rdx
  mov    -0x10(%rbp),%rax
  mov    %rax,(%rcx,%rdx,1)
  mov    -0x28(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  lea    D10(%rip),%rax
  movq   $0x0,(%rdx,%rax,1)
L164:
  lea    D10(%rip),%rax
  mov    %rax,D86(%rip)
  lea    D143(%rip),%rax
L20:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L36
  call   <__stack_chk_fail@plt>
L36:
  leave
  ret
```

assistant: ```c
struct group *__getgrent(int grp_fd) {
  static char line_buff[128];
  static char *members[11];
  static struct group group;
  char *ptr;
  char *field_begin;
  int member_num;
  char *endptr;
  int line_len;
restart:
  if ((line_len = read(grp_fd, line_buff, 128)) <= 0)
    return NULL;
  field_begin = strchr(line_buff, '\n');
  if (field_begin != NULL)
    lseek(grp_fd, (long)(1 + field_begin - (line_buff + line_len)), SEEK_CUR);
  else {
    do {
      if ((line_len = read(grp_fd, line_buff, 128)) <= 0)
        return NULL;
    } while (!(field_begin = strchr(line_buff, '\n')));
    lseek(grp_fd, (long)((field_begin - line_buff) - line_len + 1), SEEK_CUR);
    goto restart;
  }
  if (*line_buff == '#' || *line_buff == ' ' || *line_buff == '\n' || *line_buff == '\t')
    goto restart;
  *field_begin = '\0';
  group.gr_name = line_buff;
  ptr = strchr(line_buff, ':');
  if (ptr == NULL)
    goto restart;
  *ptr++ = '\0';
  group.gr_passwd = ptr;
  ptr = strchr(ptr, ':');
  if (ptr == NULL)
    goto restart;
  *ptr++ = '\0';
  field_begin = ptr;
  ptr = strchr(ptr, ':');
  if (ptr == NULL)
    goto restart;
  *ptr++ = '\0';
  group.gr_gid = (gid_t)strtoul(field_begin, &endptr, 10);
  if (*endptr != '\0')
    goto restart;
  member_num = 0;
  field_begin = ptr;
  while ((ptr = strchr(ptr, ',')) != NULL) {
    *ptr = '\0';
    ptr++;
    members[member_num] = field_begin;
    field_begin = ptr;
    member_num++;
  }
  if (*field_begin == '\0')
    members[member_num] = NULL;
  else {
    members[member_num] = field_begin;
    members[member_num + 1] = NULL;
  }
  group.gr_mem = members;
  return &group;
}
```