user: 请从给定的汇编指令推导出C源代码:

```asm
<printf>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x110,%rsp
  mov    %rdi,-0x108(%rbp)
  mov    %rsi,-0xa8(%rbp)
  mov    %rdx,-0xa0(%rbp)
  mov    %rcx,-0x98(%rbp)
  mov    %r8,-0x90(%rbp)
  mov    %r9,-0x88(%rbp)
  test   %al,%al
  je     L12
  movaps %xmm0,-0x80(%rbp)
  movaps %xmm1,-0x70(%rbp)
  movaps %xmm2,-0x60(%rbp)
  movaps %xmm3,-0x50(%rbp)
  movaps %xmm4,-0x40(%rbp)
  movaps %xmm5,-0x30(%rbp)
  movaps %xmm6,-0x20(%rbp)
  movaps %xmm7,-0x10(%rbp)
L12:
  mov    %fs:0x28,%rax
  mov    %rax,-0xb8(%rbp)
  xor    %eax,%eax
  mov    %rbp,-0xf0(%rbp)
  addq   $0x8,-0xf0(%rbp)
  jmp    L242
L24:
  mov    -0x108(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x25,%al
  jne    L87
  addq   $0x1,-0x108(%rbp)
  mov    -0x108(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x108(%rbp)
  movzbl (%rax),%eax
  movsbl %al,%eax
  cmp    $0x78,%eax
  je     L96
  cmp    $0x78,%eax
  jg     L259
  cmp    $0x73,%eax
  je     L74
  cmp    $0x73,%eax
  jg     L259
  cmp    $0x63,%eax
  je     L111
  cmp    $0x64,%eax
  je     L238
  jmp    L259
L111:
  mov    -0xf0(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    %rdx,-0xf0(%rbp)
  mov    (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <putchar@plt>
  jmp    L242
L74:
  mov    -0xf0(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    %rdx,-0xf0(%rbp)
  mov    (%rax),%eax
  cltq
  mov    %rax,-0xe8(%rbp)
  jmp    L21
L71:
  mov    -0xe8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0xe8(%rbp)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <putchar@plt>
L21:
  mov    -0xe8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L71
  jmp    L242
L96:
  mov    -0xf0(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    %rdx,-0xf0(%rbp)
  mov    (%rax),%eax
  mov    %eax,-0xf4(%rbp)
  movl   $0x1c,-0x100(%rbp)
  jmp    L193
L14:
  mov    -0x100(%rbp),%eax
  mov    -0xf4(%rbp),%edx
  mov    %eax,%ecx
  sar    %cl,%edx
  mov    %edx,%eax
  and    $0xf,%eax
  mov    %eax,-0xfc(%rbp)
  cmpl   $0x9,-0xfc(%rbp)
  jle    L188
  addl   $0x37,-0xfc(%rbp)
  jmp    L143
L188:
  addl   $0x30,-0xfc(%rbp)
L143:
  mov    -0xfc(%rbp),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <putchar@plt>
  subl   $0x4,-0x100(%rbp)
L193:
  cmpl   $0x0,-0x100(%rbp)
  jns    L14
  jmp    L242
L238:
  mov    -0xf0(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    %rdx,-0xf0(%rbp)
  mov    (%rax),%eax
  mov    %eax,-0xf8(%rbp)
  lea    -0xd0(%rbp),%rax
  add    $0xf,%rax
  mov    %rax,-0xe0(%rbp)
  mov    -0xe0(%rbp),%rax
  mov    %rax,-0xd8(%rbp)
L104:
  mov    -0xf8(%rbp),%edx
  movslq %edx,%rax
  imul   $0x66666667,%rax,%rax
  shr    $0x20,%rax
  sar    $0x2,%eax
  mov    %edx,%esi
  sar    $0x1f,%esi
  sub    %esi,%eax
  mov    %eax,%ecx
  mov    %ecx,%eax
  shl    $0x2,%eax
  add    %ecx,%eax
  add    %eax,%eax
  mov    %edx,%ecx
  sub    %eax,%ecx
  mov    %ecx,%eax
  add    $0x30,%eax
  subq   $0x1,-0xe0(%rbp)
  mov    %eax,%edx
  mov    -0xe0(%rbp),%rax
  mov    %dl,(%rax)
  mov    -0xf8(%rbp),%eax
  movslq %eax,%rdx
  imul   $0x66666667,%rdx,%rdx
  shr    $0x20,%rdx
  sar    $0x2,%edx
  sar    $0x1f,%eax
  mov    %eax,%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  mov    %eax,-0xf8(%rbp)
  cmpl   $0x0,-0xf8(%rbp)
  jne    L104
  jmp    L10
L190:
  mov    -0xe0(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0xe0(%rbp)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <putchar@plt>
L10:
  mov    -0xe0(%rbp),%rax
  cmp    -0xd8(%rbp),%rax
  jb     L190
  jmp    L242
L259:
  mov    $0x3f,%edi
  call   <putchar@plt>
  jmp    L242
L87:
  mov    -0x108(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x108(%rbp)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <putchar@plt>
L242:
  mov    -0x108(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L24
  nop
  mov    -0xb8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L93
  call   <__stack_chk_fail@plt>
L93:
  leave
  ret
```

assistant: ```c
void printf(const char *fmt, ...) {
  int *stack_head = __builtin_frame_address(0);
  stack_head += 2;
  while (*fmt) {
    if (*fmt == '%') {
      fmt++;
      switch (*fmt++) {
      case 'c':
        putchar(*stack_head++);
        break;
      case 's': {
        const char *s = (char *)*stack_head++;
        while (*s) {
          putchar(*s++);
        }
        break;
      }
      case 'x': {
        int num = *stack_head++;
        int shift = 28;
        while (shift >= 0) {
          int hd = (num >> shift) & 0xf;
          if (hd > 9)
            hd += 'A' - 10;
          else
            hd += '0';
          putchar(hd);
          shift -= 4;
        }
        break;
      }
      case 'd': {
        int num = *stack_head++;
        char buf[16];
        char *s = buf + (sizeof(buf) / sizeof(buf[0])) - 1;
        char *e = s;
        do {
          *--s = '0' + num % 10;
        } while (num /= 10);
        while (s < e)
          putchar(*s++);
        break;
      }
      default:
        putchar('?');
      }
    } else {
      putchar(*fmt++);
    }
  }
}
```