user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<copy_hunk>:
  endbr64
  push   %r15
  mov    %rdx,%r8
  push   %r14
  push   %r13
  push   %r12
  xor    %r12d,%r12d
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rsi,(%rsp)
  lea    0x24(%rsp),%r14
  lea    0x30(%rsp),%r15
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  movl   $0x1,0xc(%rsp)
  movq   $0x0,0x28(%rsp)
  movq   $0x0,0x30(%rsp)
  jmp    L95
  nopl   (%rax)
L75:
  mov    0xc(%rsp),%edx
  test   %edx,%edx
  je     L233
  mov    %r14,%rsi
  mov    %rbp,%rdi
  lea    0x28(%rsp),%r13
  call   <fgetpos@plt>
  mov    %rbp,%rdx
  mov    %r15,%rsi
  mov    %r13,%rdi
  call   <getline@plt>
  cmp    $0xffffffff,%eax
  je     L142
  mov    0x28(%rsp),%rdi
  cmpb   $0x5c,(%rdi)
  jne    L142
  mov    (%rsp),%rsi
  add    $0x1,%r12
  call   <fputs@plt>
  mov    0x28(%rsp),%rax
  movzbl (%rax),%eax
  cmp    $0x2d,%al
  je     L106
  jg     L245
  xor    %ecx,%ecx
  cmp    $0x20,%al
  je     L31
  cmp    $0x2b,%al
  jne    L155
L31:
  mov    %rbx,%r8
L95:
  mov    %r8,%rbx
  lea    0x28(%rsp),%r13
  or     %rcx,%rbx
  je     L75
L90:
  mov    %r14,%rsi
  mov    %rbp,%rdi
  mov    %rcx,0x18(%rsp)
  mov    %r8,0x10(%rsp)
  call   <fgetpos@plt>
  mov    %rbp,%rdx
  mov    %r15,%rsi
  mov    %r13,%rdi
  call   <getline@plt>
  cmp    $0xffffffff,%eax
  je     L51
  mov    (%rsp),%rsi
  mov    0x28(%rsp),%rdi
  add    $0x1,%r12
  call   <fputs@plt>
  mov    0x28(%rsp),%rax
  mov    0x10(%rsp),%r8
  mov    0x18(%rsp),%rcx
  movzbl (%rax),%eax
  cmp    $0x2d,%al
  je     L65
  jg     L4
  cmp    $0x20,%al
  je     L79
  cmp    $0x2b,%al
  jne    L93
  test   %rcx,%rcx
  je     L207
  sub    $0x1,%rcx
  mov    %r8,%rbx
  jmp    L31
  nopl   (%rax)
L245:
  cmp    $0x5c,%al
  jne    L155
L233:
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L230
  add    $0x48,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L4:
  cmp    $0x5c,%al
  jne    L93
  movl   $0x0,0xc(%rsp)
  jmp    L90
  nopl   0x0(%rax)
L155:
  xor    %r8d,%r8d
L53:
  mov    %rbx,%rcx
  mov    %r8,%rbx
  jmp    L31
  cs nopw 0x0(%rax,%rax,1)
L79:
  cmp    $0x1,%rcx
  adc    $0xffffffffffffffff,%rcx
L65:
  xor    %eax,%eax
  lea    -0x1(%r8),%rbx
  test   %r8,%r8
  cmove  %rax,%rbx
  jmp    L31
  nopw   0x0(%rax,%rax,1)
L106:
  xor    %ecx,%ecx
  jmp    L31
  nopw   0x0(%rax,%rax,1)
L93:
  mov    %rcx,%rbx
  jmp    L53
  nopl   (%rax)
L51:
  mov    0xc(%rsp),%eax
  test   %eax,%eax
  je     L233
L142:
  mov    %r14,%rsi
  mov    %rbp,%rdi
  call   <fsetpos@plt>
  jmp    L233
L207:
  mov    %r8,%rbx
  jmp    L31
L230:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
unsigned long copy_hunk(FILE *in, FILE *out, unsigned long orig_lines, unsigned long new_lines) {
  int newline = 1;
  fpos_t pos;
  char *line = NULL;
  size_t linelen = 0;
  unsigned long count = 0;
  while (orig_lines || new_lines || newline) {
    fgetpos(in, &pos);
    if (getline(&line, &linelen, in) == -1)
      break;
    if (!orig_lines && !new_lines && line[0] != '\\')
      break;
    count++;
    fputs(line, out);
    switch (line[0]) {
    case ' ':
      if (new_lines)
        new_lines--;
    case '-':
      if (orig_lines)
        orig_lines--;
      break;
    case '+':
      if (new_lines)
        new_lines--;
      break;
    case '\\':
      newline = 0;
      break;
    }
  }
  if (newline)
    fsetpos(in, &pos);
  return count;
}
```