user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<usage>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  lea    D51(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D94(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D70(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D21(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D103(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D99(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D38(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D86(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D91(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D89(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    D90(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0xffffffff,%edi
  call   <exit@plt>
  nop
  pop    %rbp
  ret
```

tool_calls: name: read_data
arguments: data_label: D51
type_guessed: string
name: read_data
arguments: data_label: D18
type_guessed: string
name: read_data
arguments: data_label: D94
type_guessed: string
name: read_data
arguments: data_label: D70
type_guessed: string
name: read_data
arguments: data_label: D21
type_guessed: string
name: read_data
arguments: data_label: D103
type_guessed: string
name: read_data
arguments: data_label: D99
type_guessed: string
name: read_data
arguments: data_label: D38
type_guessed: string
name: read_data
arguments: data_label: D86
type_guessed: string
name: read_data
arguments: data_label: D91
type_guessed: string
name: read_data
arguments: data_label: D89
type_guessed: string
name: read_data
arguments: data_label: D90
type_guessed: string

tool: D51: usage: rdev [ -rv ] [ -o OFFSET ] [ IMAGE [ VALUE [ OFFSET ] ] ]

tool: D18:   rdev /dev/fd0  (or rdev /linux, etc.) displays the current ROOT device

tool: D94:   rdev /dev/fd0 /dev/hda2         sets ROOT to /dev/hda2

tool: D70:   rdev -R /dev/fd0 1              set the ROOTFLAGS (readonly status)

tool: D21:   rdev -r /dev/fd0 627            set the RAMDISK size

tool: D103:   rdev -v /dev/fd0 1              set the bootup VIDEOMODE

tool: D99:   rdev -o N ...                   use the byte offset N

tool: D38:   rootflags ...                   same as rdev -R

tool: D86:   ramsize ...                     same as rdev -r

tool: D91:   vidmode ...                     same as rdev -v

tool: D89: Note: video modes are: -3=Ask, -2=Extended, -1=NormalVga, 1=key1, 2=key2,...

tool: D90:       use -R 1 to mount root readonly, -R 0 for read/write.

assistant: ```c
void usage(void) {
  puts(("usage: rdev [ -rv ] [ -o OFFSET ] [ IMAGE [ VALUE [ OFFSET ] ] ]"));
  puts(("  rdev /dev/fd0  (or rdev /linux, etc.) displays the current ROOT device"));
  puts(("  rdev /dev/fd0 /dev/hda2         sets ROOT to /dev/hda2"));
  puts(("  rdev -R /dev/fd0 1              set the ROOTFLAGS (readonly status)"));
  puts(("  rdev -r /dev/fd0 627            set the RAMDISK size"));
  puts(("  rdev -v /dev/fd0 1              set the bootup VIDEOMODE"));
  puts(("  rdev -o N ...                   use the byte offset N"));
  puts(("  rootflags ...                   same as rdev -R"));
  puts(("  ramsize ...                     same as rdev -r"));
  puts(("  vidmode ...                     same as rdev -v"));
  puts(("Note: video modes are: -3=Ask, -2=Extended, -1=NormalVga, 1=key1, 2=key2,..."));
  puts(("      use -R 1 to mount root readonly, -R 0 for read/write."));
  exit(-1);
}
```