user: Demonstrate the C code that generates the assembly output below:

```asm
<readdate>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <getushort@plt>
  mov    %eax,-0x24(%rbp)
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <getushort@plt>
  mov    %eax,-0x28(%rbp)
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <getushort@plt>
  mov    %eax,-0x2c(%rbp)
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <getushort@plt>
  mov    %eax,-0x30(%rbp)
  lea    -0x20(%rbp),%rax
  mov    $0x10,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  movl   $0x3380,-0x38(%rbp)
  movl   $0x1e1,-0x34(%rbp)
  movl   $0x770,-0x3c(%rbp)
  jmp    L33
L9:
  mov    -0x20(%rbp),%edx
  mov    -0x38(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x20(%rbp)
  mov    -0x1c(%rbp),%edx
  mov    -0x34(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x3c(%rbp),%eax
  and    $0x3,%eax
  test   %eax,%eax
  jne    L31
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rax
  imul   $0x51eb851f,%rax,%rax
  shr    $0x20,%rax
  sar    $0x5,%eax
  mov    %edx,%ecx
  sar    $0x1f,%ecx
  sub    %ecx,%eax
  imul   $0x64,%eax,%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  test   %eax,%eax
  jne    L56
  mov    -0x3c(%rbp),%edx
  movslq %edx,%rax
  imul   $0x51eb851f,%rax,%rax
  shr    $0x20,%rax
  sar    $0x7,%eax
  mov    %edx,%ecx
  sar    $0x1f,%ecx
  sub    %ecx,%eax
  imul   $0x190,%eax,%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  test   %eax,%eax
  jne    L31
L56:
  mov    -0x20(%rbp),%eax
  add    $0x15180,%eax
  mov    %eax,-0x20(%rbp)
L31:
  mov    -0x1c(%rbp),%edx
  mov    -0x20(%rbp),%eax
  sar    $0x10,%eax
  add    %edx,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x20(%rbp),%eax
  movzwl %ax,%eax
  mov    %eax,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    -0x1c(%rbp),%eax
  sar    $0x10,%eax
  add    %edx,%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x1c(%rbp),%eax
  movzwl %ax,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x14(%rbp),%edx
  mov    -0x18(%rbp),%eax
  sar    $0x10,%eax
  add    %edx,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  movzwl %ax,%eax
  mov    %eax,-0x18(%rbp)
  addl   $0x1,-0x3c(%rbp)
L33:
  cmpl   $0x7b1,-0x3c(%rbp)
  jle    L9
  movl   $0x0,-0x3c(%rbp)
  jmp    L40
L32:
  mov    -0x3c(%rbp),%eax
  cltq
  mov    -0x30(%rbp,%rax,4),%edx
  mov    -0x3c(%rbp),%eax
  cltq
  mov    -0x20(%rbp,%rax,4),%eax
  sub    %eax,%edx
  mov    -0x3c(%rbp),%eax
  cltq
  mov    %edx,-0x30(%rbp,%rax,4)
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  cltq
  mov    -0x30(%rbp,%rax,4),%edx
  mov    -0x3c(%rbp),%eax
  cltq
  mov    -0x30(%rbp,%rax,4),%eax
  sar    $0x10,%eax
  mov    %eax,%ecx
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  add    %ecx,%edx
  cltq
  mov    %edx,-0x30(%rbp,%rax,4)
  mov    -0x3c(%rbp),%eax
  cltq
  mov    -0x30(%rbp,%rax,4),%eax
  movzwl %ax,%edx
  mov    -0x3c(%rbp),%eax
  cltq
  mov    %edx,-0x30(%rbp,%rax,4)
  addl   $0x1,-0x3c(%rbp)
L40:
  cmpl   $0x2,-0x3c(%rbp)
  jle    L32
  mov    -0x24(%rbp),%eax
  mov    -0x14(%rbp),%edx
  sub    %edx,%eax
  mov    %eax,-0x24(%rbp)
  mov    -0x2c(%rbp),%eax
  shl    $0x10,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%eax
  or     %edx,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L68
  call   <__stack_chk_fail@plt>
L68:
  leave
  ret
```

assistant: ```c
time_t readdate(FILE *ttf) {
  int date[4], date1970[4], year[2];
  int i;
  date[3] = getushort(ttf);
  date[2] = getushort(ttf);
  date[1] = getushort(ttf);
  date[0] = getushort(ttf);
  memset(date1970, 0, sizeof(date1970));
  year[0] = (60 * 60 * 24 * 365L) & 0xffff;
  year[1] = (60 * 60 * 24 * 365L) >> 16;
  for (i = 1904; i < 1970; ++i) {
    date1970[0] += year[0];
    date1970[1] += year[1];
    if ((i & 3) == 0 && (i % 100 != 0 || i % 400 == 0))
      date1970[0] += 24 * 60 * 60L;
    date1970[1] += (date1970[0] >> 16);
    date1970[0] &= 0xffff;
    date1970[2] += date1970[1] >> 16;
    date1970[1] &= 0xffff;
    date1970[3] += date1970[2] >> 16;
    date1970[2] &= 0xffff;
  }
  for (i = 0; i < 3; ++i) {
    date[i] -= date1970[i];
    date[i + 1] += date[i] >> 16;
    date[i] &= 0xffff;
  }
  date[3] -= date1970[3];
  return ((date[1] << 16) | date[0]);
}
```