user: Please show me the C implementation that matches the assembly code listed below:

```asm
<cat>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x158,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x148(%rsp)
  xor    %eax,%eax
  lea    D0(%rip),%rdi
  call   <puts0@plt>
  lea    0x40(%rsp),%rax
  lea    0x50(%rsp),%rdx
L56:
  movb   $0x0,(%rax)
  add    $0x1,%rax
  cmp    %rax,%rdx
  jne    L56
  lea    0x40(%rsp),%rdi
  mov    $0x100,%esi
  mov    $0x0,%eax
  call   <getsn@plt>
  mov    $0x0,%eax
L96:
  movzbl 0x40(%rsp,%rax,1),%edx
  mov    %dl,0x20(%rsp,%rax,1)
  add    $0x1,%rax
  cmp    $0x10,%rax
  jne    L96
  movb   $0x0,0x30(%rsp)
  lea    0x20(%rsp),%rdi
  mov    $0x0,%esi
  mov    $0x0,%eax
  call   <open_@plt>
  mov    %eax,0xc(%rsp)
  mov    $0x0,%ebx
  lea    0x1f(%rsp),%r12
  lea    D27(%rip),%r13
  lea    D22(%rip),%r15
  lea    0x20(%rsp),%r14
  cmp    $0xffffffff,%eax
  jne    L79
  lea    D13(%rip),%rdi
  mov    $0x0,%eax
  call   <puts0@plt>
  jmp    L116
L14:
  mov    0xc(%rsp),%edi
  mov    $0x0,%eax
  call   <close_@plt>
  jmp    L116
L13:
  movsbl %dil,%edi
  mov    $0x0,%eax
  call   <putch@plt>
L79:
  mov    %r12,%rsi
  mov    $0x0,%edi
  mov    $0x0,%eax
  call   <readc@plt>
  mov    %eax,%ebp
  test   %eax,%eax
  jne    L37
  movzbl 0x1f(%rsp),%edi
  cmp    $0xa,%dil
  jne    L13
  mov    %r13,%rdi
  mov    $0x0,%eax
  call   <puts0@plt>
  add    $0x1,%ebx
  cmp    $0x17,%ebx
  jle    L79
  mov    %r15,%rdi
  mov    $0x0,%eax
  call   <puts0@plt>
  mov    %r14,%rdi
  mov    $0x0,%eax
  call   <puts0@plt>
  mov    $0x0,%eax
  call   <getch@plt>
  mov    %al,0x1f(%rsp)
  cmp    $0x71,%al
  je     L14
  mov    $0xd,%edi
  mov    $0x0,%eax
  call   <putch@plt>
  mov    $0x46,%ebx
L87:
  mov    $0x20,%edi
  mov    $0x0,%eax
  call   <putch@plt>
  sub    $0x1,%bx
  jne    L87
  mov    $0xd,%edi
  mov    $0x0,%eax
  call   <putch@plt>
  mov    %ebp,%ebx
  jmp    L79
L37:
  mov    $0x0,%edi
  mov    $0x0,%eax
  call   <close_@plt>
L116:
  mov    0x148(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L2
  add    $0x158,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L2:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: retrieve_data
arguments: data_label: D0
datatype: string
name: retrieve_data
arguments: data_label: D27
datatype: string
name: retrieve_data
arguments: data_label: D22
datatype: string
name: retrieve_data
arguments: data_label: D13
datatype: string

tool: D0: file ? 

tool: D27: 


tool: D22:  MORE 

tool: D13: can't open file


assistant: ```c
void cat(void) {
  unsigned short int i;
  unsigned short int j;
  unsigned short int equal;
  unsigned char filename[16 + 2];
  unsigned char str[256];
  char c;
  int rc;
  int line = 0;
  puts0("file ? ");
  for (i = 0; i < 16; i++)
    str[i] = 0;
  getsn(str, 256);
  for (i = 0; i < 16; i++)
    filename[i] = str[i];
  filename[16] = 0;
  rc = open_(filename, 0);
  if (rc != -1) {
  } else {
    puts0("can't open file\r\n");
    return;
  }
  while (readc(0, &c) == 0)
    if (c == '\n') {
      puts0("\r\n");
      if (++line > 23) {
        puts0(" MORE ");
        puts0(filename);
        c = getch();
        if (c == 'q') {
          close_(rc);
          return;
        }
        line = 0;
        putch('\r');
        for (i = 0; i < 70; i++)
          putch(' ');
        putch('\r');
      }
    } else
      putch(c);
  close_(0);
}
```