user: 请将以下的汇编代码转换成C语言代码：

```asm
<main>:
  endbr64
  push   %r12
  push   %rbp
  sub    $0x18,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  call   <getpid@plt>
  lea    D34(%rip),%rdi
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  call   <fork@plt>
  mov    %eax,%ebp
  xor    %eax,%eax
  call   <getpid@plt>
  cmp    $0xffffffff,%ebp
  je     L18
  mov    %eax,%r12d
  xor    %eax,%eax
  test   %ebp,%ebp
  jle    L39
  call   <getppid@plt>
  mov    %ebp,%edx
  mov    %r12d,%esi
  lea    D11(%rip),%rdi
  mov    %eax,%ecx
  xor    %eax,%eax
  xor    %r12d,%r12d
  call   <printf@plt>
  lea    0x4(%rsp),%rsi
  xor    %edx,%edx
  mov    %ebp,%edi
  call   <waitpid@plt>
  mov    0x4(%rsp),%edi
  mov    %eax,%ebp
  call   <WIFEXITED@plt>
  mov    %ebp,%esi
  lea    D39(%rip),%rdi
  mov    %eax,%edx
  xor    %eax,%eax
  call   <printf@plt>
L40:
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L21
  add    $0x18,%rsp
  mov    %r12d,%eax
  pop    %rbp
  pop    %r12
  ret
L39:
  call   <getppid@plt>
  lea    D32(%rip),%rbp
  mov    %r12d,%esi
  lea    D9(%rip),%rdi
  mov    %eax,%edx
  xor    %eax,%eax
  xor    %r12d,%r12d
  call   <printf@plt>
  mov    %rbp,%rdi
  call   <system@plt>
  lea    D83(%rip),%rdi
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  xor    %r8d,%r8d
  xor    %ecx,%ecx
  xor    %edx,%edx
  mov    %rbp,%rsi
  lea    D31(%rip),%rdi
  call   <execle@plt>
  add    $0x1,%eax
  jne    L40
  lea    D3(%rip),%rdi
  call   <puts@plt>
  jmp    L40
L18:
  lea    D17(%rip),%rdi
  mov    $0x1,%r12d
  call   <puts@plt>
  jmp    L40
L21:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: label: D34
data_type: string
name: unpack_data
arguments: label: D11
data_type: string
name: unpack_data
arguments: label: D39
data_type: string
name: unpack_data
arguments: label: D32
data_type: string
name: unpack_data
arguments: label: D9
data_type: string
name: unpack_data
arguments: label: D83
data_type: string
name: unpack_data
arguments: label: D31
data_type: string
name: unpack_data
arguments: label: D3
data_type: string
name: unpack_data
arguments: label: D17
data_type: string

tool: D34: pid:%d


tool: D11: parent %d's child %d, parent %d.


tool: D39: wait return %d, WIFEXITED=%d.


tool: D32: date

tool: D9: child %d's parent %d.


tool: D83: system() return %d.


tool: D31: /bin/date

tool: D3: failed to exec. 

tool: D17: failed to fork.

assistant: ```c
int main() {
  pid_t pid = getpid();
  printf("pid:%d\n", pid);
  pid_t fork_pid = fork();
  pid = getpid();
  if (fork_pid == -1) {
    puts("failed to fork.");
    return 1;
  } else if (fork_pid > 0) {
    printf("parent %d's child %d, parent %d.\n", pid, fork_pid, getppid());
    int status;
    pid_t wait_pid;
    wait_pid = waitpid(fork_pid, &status, 0);
    printf("wait return %d, WIFEXITED=%d.\n", wait_pid, WIFEXITED(status));
  } else {
    printf("child %d's parent %d.\n", pid, getppid());
    int system_ret = system("date");
    printf("system() return %d.\n", system_ret);
    int exec_ret = execle("/bin/date", "date", 0, 0, NULL);
    if (exec_ret == -1) {
      puts("failed to exec. ");
    }
  }
  return 0;
}
```