user: 请从给定的汇编指令推导出C源代码：

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x98,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x88(%rsp)
  xor    %eax,%eax
  lea    D29(%rip),%rsi
  lea    D103(%rip),%rdi
  call   <fopen@plt>
  mov    %rax,%r13
  lea    D101(%rip),%rsi
  lea    D110(%rip),%rdi
  call   <fopen@plt>
  mov    %rax,%rbp
  mov    %r13,%rdi
  call   <assert@plt>
  mov    %rbp,%rdi
  call   <assert@plt>
  lea    D1(%rip),%r14
  lea    D92(%rip),%r15
  jmp    L39
L17:
  mov    %rsp,%r12
  mov    %r12,%rdi
  call   <strlen@plt>
  mov    %eax,%ebx
  mov    %rbp,%rcx
  mov    $0x33,%edx
  mov    $0x1,%esi
  mov    %r14,%rdi
  call   <fwrite@plt>
  mov    %r12,%rdx
  lea    D94(%rip),%rsi
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  mov    %r12,%rdi
  call   <strlen@plt>
  mov    %eax,%edx
  lea    D127(%rip),%rsi
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  movsbl 0x1(%rsp),%ecx
  movsbl (%rsp),%edx
  lea    D122(%rip),%rsi
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  lea    -0x1(%rbx),%eax
  cltq
  movsbl (%rsp,%rax,1),%ecx
  sub    $0x2,%ebx
  movslq %ebx,%rbx
  movsbl (%rsp,%rbx,1),%edx
  lea    D91(%rip),%rsi
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  mov    %rbp,%rcx
  mov    $0x34,%edx
  mov    $0x1,%esi
  lea    D136(%rip),%rdi
  call   <fwrite@plt>
L39:
  mov    %rsp,%rdi
  mov    %r13,%rdx
  mov    $0x80,%esi
  call   <fgets@plt>
  test   %rax,%rax
  je     L5
  cmpb   $0xa,(%rsp)
  jne    L17
  mov    %rbp,%rcx
  mov    $0x33,%edx
  mov    $0x1,%esi
  mov    %r14,%rdi
  call   <fwrite@plt>
  mov    %rbp,%rcx
  mov    $0x15,%edx
  mov    $0x1,%esi
  mov    %r15,%rdi
  call   <fwrite@plt>
  mov    %rsp,%rdi
  call   <strlen@plt>
  mov    %eax,%edx
  lea    D82(%rip),%rsi
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  movsbl (%rsp),%edx
  lea    D14(%rip),%rsi
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  mov    %rbp,%rcx
  mov    $0x34,%edx
  mov    $0x1,%esi
  lea    D136(%rip),%rdi
  call   <fwrite@plt>
  jmp    L17
L5:
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    %rbp,%rdi
  call   <fclose@plt>
  mov    0x88(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L34
  mov    $0x0,%eax
  add    $0x98,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L34:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: label: D29
type: string
name: read_data
arguments: label: D103
type: string
name: read_data
arguments: label: D101
type: string
name: read_data
arguments: label: D110
type: string
name: read_data
arguments: label: D1
type: string
name: read_data
arguments: label: D92
type: string
name: read_data
arguments: label: D94
type: string
name: read_data
arguments: label: D127
type: string
name: read_data
arguments: label: D122
type: string
name: read_data
arguments: label: D91
type: string
name: read_data
arguments: label: D136
type: string
name: read_data
arguments: label: D82
type: string
name: read_data
arguments: label: D14
type: string

tool: D29: r

tool: D103: input.dat

tool: D101: w

tool: D110: output.dat

tool: D1: ==================================================


tool: D92: this is a white line


tool: D94: the line you've just entered is '%s'


tool: D127: the length of it is %d


tool: D122: first two chars '%c' and '%c'


tool: D91: last two chars '%c' and '%c'


tool: D136: ==================================================



tool: D82: the length of this line is %d


tool: D14: char is '%c'


assistant: ```c
int main(void) {
  char line[128];
  int len;
  FILE *in, *out;
  in = fopen("input.dat", "r");
  out = fopen("output.dat", "w");
  assert(in);
  assert(out);
  while (fgets(line, sizeof(line), in) != NULL) {
    if (line[0] == '\n') {
      fprintf(out, "==================================================\n");
      fprintf(out, "this is a white line\n");
      len = strlen(line);
      fprintf(out, "the length of this line is %d\n", len);
      fprintf(out, "char is '%c'\n", line[0]);
      fprintf(out, "==================================================\n\n");
    }
    len = strlen(line);
    fprintf(out, "==================================================\n");
    fprintf(out, "the line you've just entered is '%s'\n", line);
    fprintf(out, "the length of it is %d\n", strlen(line));
    fprintf(out, "first two chars '%c' and '%c'\n", line[0], line[1]);
    fprintf(out, "last two chars '%c' and '%c'\n", line[len - 2], line[len - 1]);
    fprintf(out, "==================================================\n\n");
  }
  fclose(in);
  fclose(out);
  return 0;
}
```