user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<get_drives>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x248,%rsp
  mov    %rdi,-0x248(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  lea    D30(%rip),%rax
  mov    %rax,%rdi
  call   <opendir@plt>
  mov    %rax,-0x238(%rbp)
  cmpq   $0x0,-0x238(%rbp)
  jne    L76
  lea    D42(%rip),%rax
  mov    %rax,%rdi
  call   <write_debug@plt>
  lea    D29(%rip),%rax
  mov    %rax,%rdi
  call   <opendir@plt>
  mov    %rax,-0x238(%rbp)
  cmpq   $0x0,-0x238(%rbp)
  jne    L76
  mov    -0x248(%rbp),%rax
  movl   $0x0,(%rax)
  mov    $0x0,%eax
  jmp    L46
L76:
  movl   $0x0,-0x240(%rbp)
  jmp    L34
L13:
  mov    -0x230(%rbp),%rax
  mov    (%rax),%rax
  lea    D36(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L34
  mov    -0x230(%rbp),%rax
  mov    (%rax),%rax
  lea    D25(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L34
  mov    $0x8,%edi
  call   <malloc@plt>
  mov    -0x240(%rbp),%edx
  movslq %edx,%rdx
  mov    %rax,-0x220(%rbp,%rdx,8)
  mov    -0x230(%rbp),%rax
  mov    (%rax),%rcx
  mov    -0x240(%rbp),%eax
  cltq
  mov    -0x220(%rbp,%rax,8),%rax
  mov    $0x8,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
  addl   $0x1,-0x240(%rbp)
L34:
  mov    -0x238(%rbp),%rax
  mov    %rax,%rdi
  call   <readdir@plt>
  mov    %rax,-0x230(%rbp)
  cmpq   $0x0,-0x230(%rbp)
  jne    L13
  mov    -0x238(%rbp),%rax
  mov    %rax,%rdi
  call   <closedir@plt>
  mov    -0x240(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x228(%rbp)
  movl   $0x0,-0x23c(%rbp)
  jmp    L80
L58:
  mov    -0x23c(%rbp),%eax
  cltq
  mov    -0x220(%rbp,%rax,8),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    $0x1,%eax
  mov    %eax,%edx
  mov    -0x23c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rcx
  mov    -0x228(%rbp),%rax
  lea    (%rcx,%rax,1),%rbx
  mov    %edx,%edi
  call   <malloc@plt>
  mov    %rax,(%rbx)
  mov    -0x23c(%rbp),%eax
  cltq
  mov    -0x220(%rbp,%rax,8),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,%rdx
  mov    -0x23c(%rbp),%eax
  cltq
  mov    -0x220(%rbp,%rax,8),%rcx
  mov    -0x23c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rsi
  mov    -0x228(%rbp),%rax
  add    %rsi,%rax
  mov    (%rax),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
  mov    -0x23c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x228(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rbx
  mov    -0x23c(%rbp),%eax
  cltq
  mov    -0x220(%rbp,%rax,8),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    %rbx,%rax
  movb   $0x0,(%rax)
  addl   $0x1,-0x23c(%rbp)
L80:
  mov    -0x23c(%rbp),%eax
  cmp    -0x240(%rbp),%eax
  jl     L58
  mov    -0x248(%rbp),%rax
  mov    -0x240(%rbp),%edx
  mov    %edx,(%rax)
  mov    -0x228(%rbp),%rax
L46:
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L86
  call   <__stack_chk_fail@plt>
L86:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

tool_calls: name: unpack_data
arguments: data_tag: D30
datatype: string
name: unpack_data
arguments: data_tag: D42
datatype: string
name: unpack_data
arguments: data_tag: D29
datatype: string
name: unpack_data
arguments: data_tag: D36
datatype: string
name: unpack_data
arguments: data_tag: D25
datatype: string

tool: D30: /sys/class/scsi_generic

tool: D42: Cannot open /sys/class/scsi_generic


tool: D29: /sys/block

tool: D36: .

tool: D25: ..

assistant: ```c
char **get_drives(int *driveNum) {
  DIR *d;
  struct dirent *ent;
  char *tmp[64];
  char **ret;
  int j, jj;
  d = opendir("/sys/class/scsi_generic");
  if (!d) {
    write_debug("Cannot open /sys/class/scsi_generic\n");
    d = opendir("/sys/block");
    if (!d) {
      *driveNum = 0;
      return NULL;
    }
  }
  j = 0;
  while ((ent = readdir(d))) {
    if (strcmp(ent->d_name, ".") != 0 && strcmp(ent->d_name, "..") != 0) {
      tmp[j] = malloc(sizeof(ent->d_name));
      strncpy(tmp[j], ent->d_name, sizeof(ent->d_name));
      ++j;
    }
  }
  closedir(d);
  ret = malloc(j * sizeof(char *));
  for (jj = 0; jj < j; ++jj) {
    ret[jj] = malloc(strlen(tmp[jj]) + 1);
    strncpy(ret[jj], tmp[jj], strlen(tmp[jj]));
    ret[jj][strlen(tmp[jj])] = '\0';
  }
  *driveNum = j;
  return ret;
}
```