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

```asm
<diff_long>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %rsi,%rbp
  mov    %edx,%esi
  push   %rbx
  sub    $0x88,%rsp
  mov    %edx,0x8(%rsp)
  mov    %fs:0x28,%rdx
  mov    %rdx,0x78(%rsp)
  xor    %edx,%edx
  cmp    $0x3,%esi
  jbe    L63
  mov    %ecx,%eax
  mov    %rdi,%rbx
  shr    $0x2,%eax
  mov    %eax,0xc(%rsp)
  sub    $0x1,%eax
  lea    0x9(%rax,%rax,8),%rcx
  lea    0x20(%rsp),%rax
  mov    %rax,(%rsp)
  add    %rcx,%rax
  mov    %rcx,0x10(%rsp)
  mov    %rax,0x18(%rsp)
  nopl   0x0(%rax)
L23:
  mov    0x8(%rsp),%r12d
  mov    $0x8,%eax
  mov    0xc(%rsp),%r15d
  shr    $0x2,%r12d
  cmp    %eax,%r12d
  cmova  %eax,%r12d
  test   %r15d,%r15d
  je     L87
  mov    0x10(%rsp),%rdx
  mov    (%rsp),%rdi
  mov    $0x20,%esi
  call   <memset@plt>
  mov    0x18(%rsp),%r8
  cmp    %r15d,%r12d
  jbe    L106
L7:
  mov    %r15d,%r11d
  xor    %r10d,%r10d
  mov    $0x76,%r14d
  mov    $0x2d,%r13d
  xchg   %ax,%ax
L38:
  mov    (%rbx,%r10,1),%ecx
  mov    0x0(%rbp,%r10,1),%edx
  movb   $0x20,(%r8)
  lea    0x1(%r8),%rax
  xor    %ecx,%edx
  cmp    $0x4,%r11d
  je     L30
L84:
  lea    0x8(%rax),%r8
  nopl   0x0(%rax)
L72:
  mov    %edx,%edi
  mov    $0x20,%esi
  and    $0xf0000000,%edi
  je     L74
  mov    %edi,%r9d
  mov    $0x5e,%esi
  and    %ecx,%r9d
  je     L74
  cmp    %edi,%r9d
  mov    %r13d,%esi
  cmove  %r14d,%esi
L74:
  add    $0x1,%rax
  shl    $0x4,%edx
  mov    %sil,-0x1(%rax)
  shl    $0x4,%ecx
  cmp    %r8,%rax
  jne    L72
  add    $0x1,%r11d
  add    $0x4,%r10
  cmp    %r11d,%r12d
  ja     L38
  lea    -0x1(%r12),%eax
  mov    $0x4,%edx
  sub    %r15d,%eax
  add    $0x1,%r15d
  cmp    %r12d,%r15d
  lea    0x4(,%rax,4),%rax
  cmova  %rdx,%rax
  add    %rax,%rbx
  add    %rax,%rbp
L106:
  movb   $0x0,(%r8)
  mov    (%rsp),%rsi
  lea    D9(%rip),%rdi
  shl    $0x2,%r12d
  call   <printf@plt>
  sub    %r12d,0x8(%rsp)
  mov    0x8(%rsp),%eax
  cmp    $0x3,%eax
  ja     L23
L63:
  mov    0x78(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L107
  add    $0x88,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L30:
  movb   $0x20,0x1(%r8)
  lea    0x2(%r8),%rax
  jmp    L84
L87:
  mov    (%rsp),%r8
  xor    %r15d,%r15d
  jmp    L7
L107:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_label: D9
type_guessed: string

tool: D9:          %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;
  }
}
```