user: What would the C source look like for the assembly code provided here?

```asm
<dump_sector>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  call   <dump_header@plt>
  test   %eax,%eax
  js     L173
  je     L52
  movl   $0x0,0xc(%rsp)
  mov    D13(%rip),%r14
  mov    %eax,%ebp
  lea    0xf(%rsp),%r13
  movl   $0x0,0x8(%rsp)
  nopl   0x0(%rax,%rax,1)
L234:
  mov    0x8(%rsp),%eax
  mov    $0x1,%r15d
  mov    $0x10,%ebx
  lea    -0x1(%rax),%r12d
  nopl   0x0(%rax,%rax,1)
L169:
  lea    (%r12,%r15,1),%eax
  cmp    %eax,%ebp
  jle    L231
  xor    %eax,%eax
  call   <getchar@plt>
  mov    D6(%rip),%rcx
  cmp    %eax,(%rcx)
  je     L207
  mov    %al,0x0(%r13,%r15,1)
  mov    %r15d,%ebx
  add    $0x1,%r15
  cmp    $0x11,%r15
  jne    L169
  movzbl 0x10(%rsp),%edi
  mov    (%r14),%esi
  mov    $0x10,%ebx
  call   <fputc@plt>
  movzbl 0x11(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  movzbl 0x12(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  movzbl 0x13(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  movzbl 0x14(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
L26:
  movzbl 0x15(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x6,%ebx
  je     L48
  movzbl 0x16(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x7,%ebx
  je     L48
  movzbl 0x17(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x8,%ebx
  je     L48
  movzbl 0x18(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x9,%ebx
  je     L48
  movzbl 0x19(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0xa,%ebx
  je     L48
  movzbl 0x1a(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0xb,%ebx
  je     L48
  movzbl 0x1b(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0xc,%ebx
  je     L48
  movzbl 0x1c(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0xd,%ebx
  je     L48
  movzbl 0x1d(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0xe,%ebx
  je     L48
  movzbl 0x1e(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x10,%ebx
  jne    L48
  movzbl 0x1f(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  addl   $0x10,0x8(%rsp)
  mov    0x8(%rsp),%eax
  cmp    %eax,%ebp
  jg     L234
  nopl   0x0(%rax)
L48:
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L206
  mov    0xc(%rsp),%eax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L207:
  movl   $0xffffffff,0xc(%rsp)
L231:
  movzbl 0x10(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x1,%ebx
  je     L48
  movzbl 0x11(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x2,%ebx
  je     L48
  movzbl 0x12(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x3,%ebx
  je     L48
  movzbl 0x13(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x4,%ebx
  je     L48
  movzbl 0x14(%rsp),%edi
  mov    (%r14),%esi
  call   <fputc@plt>
  cmp    $0x5,%ebx
  jne    L26
  jmp    L48
  nopl   0x0(%rax,%rax,1)
L52:
  movl   $0x0,0xc(%rsp)
  jmp    L48
L206:
  call   <__stack_chk_fail@plt>
  nopw   0x0(%rax,%rax,1)
L173:
  movl   $0xffffffff,0xc(%rsp)
  jmp    L48
```

assistant: ```c
int dump_sector(void) {
  unsigned char buf[16];
  int a, b, c, len, blen, ret;
  len = dump_header();
  if (len < 0)
    return -1;
  a = 0;
  ret = 0;
  while (a < len) {
    for (b = 0; b < 16; b++) {
      if ((a + b) >= len)
        break;
      c = getchar();
      if (c == EOF) {
        ret = -1;
        break;
      }
      buf[b] = c;
      blen = b + 1;
    }
    for (b = 0; b < 16; b++)
      if (b < blen)
        fputc(buf[b], stdout);
    if (blen != 16)
      break;
    a += 16;
  }
  return ret;
}
```