user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<main>:
  endbr64
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rdi
  call   <pipe@plt>
  xor    %eax,%eax
  call   <fork@plt>
  test   %rax,%rax
  je     L19
  mov    (%rsp),%edi
  call   <close@plt>
  mov    0x4(%rsp),%edi
  mov    $0x1,%esi
  call   <dup2@plt>
  lea    D57(%rip),%rdi
  xor    %r9d,%r9d
  xor    %eax,%eax
  lea    D30(%rip),%r8
  lea    D75(%rip),%rcx
  mov    %rdi,%rsi
  lea    D55(%rip),%rdx
  call   <execlp@plt>
L33:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L44
  xor    %eax,%eax
  add    $0x28,%rsp
  ret
L19:
  mov    0x4(%rsp),%edi
  call   <close@plt>
  mov    (%rsp),%edi
  xor    %esi,%esi
  call   <dup2@plt>
  lea    0x8(%rsp),%rdi
  call   <pipe@plt>
  xor    %eax,%eax
  call   <fork@plt>
  test   %rax,%rax
  je     L50
  mov    0x8(%rsp),%edi
  call   <close@plt>
  mov    0xc(%rsp),%edi
  mov    $0x1,%esi
  call   <dup2@plt>
  lea    D56(%rip),%rdi
  xor    %r8d,%r8d
  xor    %eax,%eax
  lea    D90(%rip),%rcx
  lea    D8(%rip),%rdx
  mov    %rdi,%rsi
  call   <execlp@plt>
  jmp    L33
L50:
  mov    0xc(%rsp),%edi
  call   <close@plt>
  mov    0x8(%rsp),%edi
  xor    %esi,%esi
  call   <dup2@plt>
  lea    0x10(%rsp),%rdi
  call   <pipe@plt>
  xor    %eax,%eax
  call   <fork@plt>
  test   %rax,%rax
  je     L12
  mov    0x10(%rsp),%edi
  call   <close@plt>
  mov    0x14(%rsp),%edi
  mov    $0x1,%esi
  call   <dup2@plt>
  lea    D40(%rip),%rdi
  xor    %edx,%edx
  xor    %eax,%eax
  mov    %rdi,%rsi
  call   <execlp@plt>
  jmp    L33
L12:
  mov    0x14(%rsp),%edi
  call   <close@plt>
  mov    0x10(%rsp),%edi
  xor    %esi,%esi
  call   <dup2@plt>
  lea    D98(%rip),%rdi
  xor    %ecx,%ecx
  xor    %eax,%eax
  lea    D12(%rip),%rdx
  mov    %rdi,%rsi
  call   <execlp@plt>
  jmp    L33
L44:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: parse_data
arguments: data_label: D57
type: string
name: parse_data
arguments: data_label: D30
type: string
name: parse_data
arguments: data_label: D75
type: string
name: parse_data
arguments: data_label: D55
type: string
name: parse_data
arguments: data_label: D56
type: string
name: parse_data
arguments: data_label: D90
type: string
name: parse_data
arguments: data_label: D8
type: string
name: parse_data
arguments: data_label: D40
type: string
name: parse_data
arguments: data_label: D98
type: string
name: parse_data
arguments: data_label: D12
type: string

tool: D57: grep

tool: D30: /etc/passwd

tool: D75: ^#

tool: D55: -v

tool: D56: cut

tool: D90: -d:

tool: D8: -f7

tool: D40: uniq

tool: D98: wc

tool: D12: -l

assistant: ```c
int main() {
  int fd[2];
  pipe(fd);
  if (fork() != 0) {
    close(fd[0]);
    dup2(fd[1], 1);
    execlp("grep", "grep", "-v", "^#", "/etc/passwd", NULL);
  } else {
    close(fd[1]);
    dup2(fd[0], 0);
    int fd2[2];
    pipe(fd2);
    if (fork() != 0) {
      close(fd2[0]);
      dup2(fd2[1], 1);
      execlp("cut", "cut", "-f7", "-d:", NULL);
    } else {
      close(fd2[1]);
      dup2(fd2[0], 0);
      int fd3[2];
      pipe(fd3);
      if (fork() != 0) {
        close(fd3[0]);
        dup2(fd3[1], 1);
        execlp("uniq", "uniq", NULL);
      } else {
        close(fd3[1]);
        dup2(fd3[0], 0);
        execlp("wc", "wc", "-l", NULL);
      }
    }
  }
}
```