user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<main>:
  endbr64
  push   %rbp
  push   %rbx
  mov    $0x30,%ebx
  sub    $0x8,%rsp
  nop
L215:
  mov    %ebx,%edi
  add    $0x1,%ebx
  call   <skiboot_isdigit@plt>
  mov    %eax,%edi
  call   <assert@plt>
  cmp    $0x3a,%ebx
  jne    L215
  mov    $0x61,%edi
  mov    $0xffffffd0,%ebx
  call   <skiboot_isdigit@plt>
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  call   <assert@plt>
  mov    $0x5a,%edi
  call   <skiboot_isdigit@plt>
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  call   <assert@plt>
  jmp    L165
  nopl   0x0(%rax,%rax,1)
L196:
  xor    %edi,%edi
  cmp    $0x9,%ebx
  seta   %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0xd1,%ebx
  je     L121
L165:
  lea    0x30(%rbx),%edi
  call   <skiboot_isdigit@plt>
  test   %eax,%eax
  je     L196
  xor    %edi,%edi
  cmp    $0x9,%ebx
  setbe  %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0xd1,%ebx
  jne    L165
L121:
  mov    $0x30,%ebx
  nopl   0x0(%rax,%rax,1)
L161:
  mov    %ebx,%edi
  add    $0x1,%ebx
  call   <skiboot_isprint@plt>
  mov    %eax,%edi
  call   <assert@plt>
  cmp    $0x3a,%ebx
  jne    L161
  xor    %edi,%edi
  call   <skiboot_isprint@plt>
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  call   <assert@plt>
  mov    $0x4,%edi
  call   <skiboot_isprint@plt>
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  xor    %ebx,%ebx
  call   <assert@plt>
  jmp    L49
  nopl   (%rax)
L203:
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  je     L1
L49:
  mov    %ebx,%edi
  call   <skiboot_isprint@plt>
  mov    %ebx,%edi
  mov    %eax,%ebp
  call   <isprint@plt>
  test   %ebp,%ebp
  je     L203
  mov    %eax,%edi
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  jne    L49
L1:
  mov    $0x30,%ebx
  nopl   0x0(%rax,%rax,1)
L142:
  mov    %ebx,%edi
  call   <skiboot_isspace@plt>
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x3a,%ebx
  jne    L142
  mov    $0xc,%edi
  xor    %ebx,%ebx
  call   <skiboot_isspace@plt>
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0xa,%edi
  call   <skiboot_isspace@plt>
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x20,%edi
  call   <skiboot_isspace@plt>
  mov    %eax,%edi
  call   <assert@plt>
  jmp    L74
  nopl   0x0(%rax,%rax,1)
L127:
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  je     L178
L74:
  mov    %ebx,%edi
  call   <skiboot_isspace@plt>
  mov    %ebx,%edi
  mov    %eax,%ebp
  call   <isspace@plt>
  test   %ebp,%ebp
  je     L127
  mov    %eax,%edi
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  jne    L74
L178:
  mov    $0x30,%ebx
  nopl   0x0(%rax,%rax,1)
L213:
  mov    %ebx,%edi
  add    $0x1,%ebx
  call   <skiboot_isxdigit@plt>
  mov    %eax,%edi
  call   <assert@plt>
  cmp    $0x3a,%ebx
  jne    L213
  mov    $0x61,%edi
  call   <skiboot_isxdigit@plt>
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x41,%edi
  call   <skiboot_isxdigit@plt>
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x46,%edi
  call   <skiboot_isxdigit@plt>
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x5a,%edi
  call   <skiboot_isxdigit@plt>
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  xor    %ebx,%ebx
  call   <assert@plt>
  jmp    L21
  nopl   0x0(%rax)
L91:
  xor    %edi,%edi
  test   %eax,%eax
  sete   %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  je     L45
L21:
  mov    %ebx,%edi
  call   <skiboot_isxdigit@plt>
  mov    %ebx,%edi
  mov    %eax,%ebp
  call   <isxdigit@plt>
  test   %ebp,%ebp
  je     L91
  mov    %eax,%edi
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  jne    L21
L45:
  xor    %ebx,%ebx
L52:
  mov    %ebx,%edi
  call   <skiboot_tolower@plt>
  mov    %ebx,%edi
  mov    %rax,%rbp
  call   <tolower@plt>
  xor    %edi,%edi
  cmp    %rax,%rbp
  sete   %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  jne    L52
  xor    %ebx,%ebx
  nopl   0x0(%rax)
L113:
  mov    %ebx,%edi
  call   <skiboot_toupper@plt>
  mov    %ebx,%edi
  mov    %rax,%rbp
  call   <toupper@plt>
  xor    %edi,%edi
  cmp    %rax,%rbp
  sete   %dil
  add    $0x1,%ebx
  call   <assert@plt>
  cmp    $0x101,%ebx
  jne    L113
  add    $0x8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  ret
```

assistant: ```c
int main(void) {
  int i;
  int r1, r2;
  for (i = '0'; i <= '9'; i++)
    assert(skiboot_isdigit(i));
  assert(skiboot_isdigit('a') == 0);
  assert(skiboot_isdigit('Z') == 0);
  for (i = 0; i < 257; i++) {
    r1 = skiboot_isdigit(i);
    r2 = isdigit(i);
    if (r1)
      assert(r2);
    if (!r1)
      assert(!r2);
  }
  for (i = '0'; i <= '9'; i++)
    assert(skiboot_isprint(i));
  assert(skiboot_isprint('\0') == 0);
  assert(skiboot_isprint(4) == 0);
  for (i = 0; i < 257; i++) {
    r1 = skiboot_isprint(i);
    r2 = isprint(i);
    if (r1)
      assert(r2);
    if (!r1)
      assert(!r2);
  }
  for (i = '0'; i <= '9'; i++)
    assert(skiboot_isspace(i) == 0);
  assert(skiboot_isspace('\f'));
  assert(skiboot_isspace('\n'));
  assert(skiboot_isspace(' '));
  for (i = 0; i < 257; i++) {
    r1 = skiboot_isspace(i);
    r2 = isspace(i);
    if (r1)
      assert(r2);
    if (!r1)
      assert(!r2);
  }
  for (i = '0'; i <= '9'; i++)
    assert(skiboot_isxdigit(i));
  assert(skiboot_isxdigit('a'));
  assert(skiboot_isxdigit('A'));
  assert(skiboot_isxdigit('F'));
  assert(skiboot_isxdigit('Z') == 0);
  for (i = 0; i < 257; i++) {
    r1 = skiboot_isxdigit(i);
    r2 = isxdigit(i);
    if (r1)
      assert(r2);
    if (!r1)
      assert(!r2);
  }
  for (i = 0; i < 257; i++) {
    assert(skiboot_tolower(i) == tolower(i));
  }
  for (i = 0; i < 257; i++) {
    assert(skiboot_toupper(i) == toupper(i));
  }
  return 0;
}
```