user: 请从给定的汇编指令推导出C源代码:

```asm
<diff_long>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xc0,%rsp
  mov    %rdi,-0xa8(%rbp)
  mov    %rsi,-0xb0(%rbp)
  mov    %edx,-0xb4(%rbp)
  mov    %ecx,-0xb8(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0xa8(%rbp),%rax
  mov    %rax,-0x78(%rbp)
  mov    -0xb0(%rbp),%rax
  mov    %rax,-0x70(%rbp)
  jmp    L79
L29:
  lea    -0x60(%rbp),%rax
  mov    %rax,-0x68(%rbp)
  mov    -0xb4(%rbp),%eax
  shr    $0x2,%eax
  mov    $0x8,%edx
  cmp    %edx,%eax
  cmova  %edx,%eax
  mov    %eax,-0x80(%rbp)
  movl   $0x0,-0x94(%rbp)
  jmp    L70
L37:
  movl   $0x0,-0x90(%rbp)
  jmp    L92
L25:
  mov    -0x68(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x68(%rbp)
  movb   $0x20,(%rax)
  addl   $0x1,-0x90(%rbp)
L92:
  cmpl   $0x8,-0x90(%rbp)
  jbe    L25
  addl   $0x1,-0x94(%rbp)
L70:
  mov    -0xb8(%rbp),%eax
  shr    $0x2,%eax
  cmp    %eax,-0x94(%rbp)
  jb     L37
  jmp    L78
L48:
  mov    -0x78(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    %rdx,-0x78(%rbp)
  mov    (%rax),%eax
  mov    %eax,-0x8c(%rbp)
  mov    -0x70(%rbp),%rax
  lea    0x4(%rax),%rdx
  mov    %rdx,-0x70(%rbp)
  mov    (%rax),%eax
  xor    -0x8c(%rbp),%eax
  mov    %eax,-0x88(%rbp)
  mov    -0x68(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x68(%rbp)
  movb   $0x20,(%rax)
  cmpl   $0x4,-0x94(%rbp)
  jne    L166
  mov    -0x68(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x68(%rbp)
  movb   $0x20,(%rax)
L166:
  movl   $0x0,-0x90(%rbp)
  jmp    L65
L53:
  mov    -0x88(%rbp),%eax
  and    $0xf0000000,%eax
  mov    %eax,-0x7c(%rbp)
  movl   $0x20,-0x84(%rbp)
  cmpl   $0x0,-0x7c(%rbp)
  je     L71
  mov    -0x8c(%rbp),%eax
  and    -0x7c(%rbp),%eax
  test   %eax,%eax
  jne    L33
  movl   $0x5e,-0x84(%rbp)
  jmp    L71
L33:
  mov    -0x8c(%rbp),%eax
  and    -0x7c(%rbp),%eax
  cmp    %eax,-0x7c(%rbp)
  jne    L61
  movl   $0x76,-0x84(%rbp)
  jmp    L71
L61:
  movl   $0x2d,-0x84(%rbp)
L71:
  mov    -0x68(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x68(%rbp)
  mov    -0x84(%rbp),%edx
  mov    %dl,(%rax)
  shll   $0x4,-0x88(%rbp)
  shll   $0x4,-0x8c(%rbp)
  addl   $0x1,-0x90(%rbp)
L65:
  cmpl   $0x7,-0x90(%rbp)
  jbe    L53
  addl   $0x1,-0x94(%rbp)
L78:
  mov    -0x94(%rbp),%eax
  cmp    -0x80(%rbp),%eax
  jb     L48
  mov    -0x68(%rbp),%rax
  movb   $0x0,(%rax)
  lea    -0x60(%rbp),%rax
  mov    %rax,%rsi
  lea    D1(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    -0x80(%rbp),%eax
  shl    $0x2,%eax
  sub    %eax,-0xb4(%rbp)
L79:
  cmpl   $0x3,-0xb4(%rbp)
  ja     L29
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L10
  call   <__stack_chk_fail@plt>
L10:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: label: D1
data_type: string

tool: D1:          %s


assistant: ```c
void diff_long(unsigned char *src1, unsigned char *src2, unsigned cnt, unsigned skip) {
  unsigned char buf[8 * 9 + 2];
  unsigned *s1 = (unsigned *)src1;
  unsigned *s2 = (unsigned *)src2;
  unsigned i, j;
  while (cnt >= 4) {
    char *p = buf;
    unsigned max = (((cnt >> 2) < (8)) ? (cnt >> 2) : (8));
    for (i = 0; i < (skip >> 2); i++) {
      for (j = 0; j < 9; j++)
        *p++ = ' ';
    }
    for (; i < max; i++) {
      unsigned s1v = *s1++;
      unsigned diff = s1v ^ *s2++;
      unsigned c;
      *p++ = ' ';
      if (i == 4)
        *p++ = ' ';
      for (j = 0; j < 8; j++) {
        unsigned changed = diff & 0xf0000000;
        c = ' ';
        if (changed) {
          if ((s1v & changed) == 0)
            c = '^';
          else if ((s1v & changed) == changed)
            c = 'v';
          else
            c = '-';
        }
        *p++ = c;
        diff <<= 4;
        s1v <<= 4;
      }
    }
    *p = 0;
    printf("         %s\n", buf);
    cnt -= max << 2;
  }
}
```