user: 请从给定的汇编指令推导出C源代码:

```asm
<getFile>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    D24(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D3(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  call   <fileInstructions@plt>
  movl   $0x0,-0x1c(%rbp)
  movq   $0x0,-0x18(%rbp)
  jmp    L27
L68:
  lea    D3(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%esi
  mov    $0x0,%edi
  call   <getcwd@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  mov    %rax,%rsi
  lea    D23(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    D8(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    -0x1c(%rbp),%rax
  mov    %rax,%rdi
  call   <getInt@plt>
  mov    -0x1c(%rbp),%eax
  cmp    $0x4,%eax
  je     L97
  cmp    $0x4,%eax
  jg     L45
  cmp    $0x3,%eax
  je     L0
  cmp    $0x3,%eax
  jg     L45
  cmp    $0x1,%eax
  je     L14
  cmp    $0x2,%eax
  je     L98
  jmp    L45
L14:
  mov    $0x0,%eax
  call   <ls@plt>
  jmp    L27
L98:
  mov    $0x0,%eax
  call   <cd@plt>
  jmp    L27
L0:
  mov    $0x0,%eax
  call   <selectFile@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  je     L27
  mov    -0x18(%rbp),%rax
  jmp    L38
L97:
  lea    D9(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  jmp    L27
L45:
  lea    D1(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  call   <fileInstructions@plt>
L27:
  mov    -0x1c(%rbp),%eax
  cmp    $0x4,%eax
  jne    L68
  mov    $0x0,%eax
L38:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L41
  call   <__stack_chk_fail@plt>
L41:
  leave
  ret
```

tool_calls: name: disassemble_data
arguments: data_tag: D24
datatype: string
name: disassemble_data
arguments: data_tag: D3
datatype: string
name: disassemble_data
arguments: data_tag: D23
datatype: string
name: disassemble_data
arguments: data_tag: D8
datatype: string
name: disassemble_data
arguments: data_tag: D9
datatype: string
name: disassemble_data
arguments: data_tag: D1
datatype: string

tool: D24: #########################################################
# Welcome to a low-level file navigation and input system
# Basic UNIX-esque functions are provided
#   ls: lists the files in the current working directory
#   cd: change the current working directory
#   select: choose a *.txt file (from the current working directory) to import into the AVL tree
#   exit: exits this file browser
#########################################################

tool: D3: -----------------------

tool: D23: # PWD: %s


tool: D8: # Enter a command: 

tool: D9: # Exiting file browser...

tool: D1: # Invalid command!

assistant: ```c
FILE *getFile() {
  printf("#########################################################\n"
         "# Welcome to a low-level file navigation and input system\n"
         "# Basic UNIX-esque functions are provided\n"
         "#   ls: lists the files in the current working directory\n"
         "#   cd: change the current working directory\n"
         "#   select: choose a *.txt file (from the current working directory) to import into the AVL tree\n"
         "#   exit: exits this file browser\n"
         "#########################################################\n");
  printf("-----------------------\n");
  ;
  fileInstructions();
  int cmd = 0;
  FILE *res = NULL;
  while (4 != cmd) {
    printf("-----------------------\n");
    ;
    char *pwd = getcwd(NULL, 0);
    printf("# PWD: %s\n", pwd);
    printf("# Enter a command: ");
    getInt(&cmd);
    switch (cmd) {
    case 1:
      ls();
      break;
    case 2:
      cd();
      break;
    case 3:
      res = selectFile();
      if (res) {
        return res;
      }
      break;
    case 4:
      printf("# Exiting file browser...\n");
      break;
    default:
      printf("# Invalid command!\n");
      fileInstructions();
    }
  }
  return NULL;
}
```