user: 请从给定的汇编指令推导出C源代码：

```asm
<display_byte>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %rdx,-0x48(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
L122:
  mov    -0x38(%rbp),%rax
  cmp    -0x40(%rbp),%rax
  jae    L161
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <rd_byte@plt>
  mov    %al,-0x25(%rbp)
  mov    -0x38(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x48(%rbp)
  mov    %rdx,%rax
  test   %rax,%rax
  jne    L70
  mov    -0x38(%rbp),%rax
  mov    %rax,%rsi
  lea    D1(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
L70:
  mov    -0x38(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x48(%rbp)
  movzbl -0x25(%rbp),%eax
  mov    %al,-0x20(%rbp,%rdx,1)
  addq   $0x1,-0x38(%rbp)
  movzbl -0x25(%rbp),%eax
  mov    $0x20,%edx
  mov    %eax,%esi
  lea    D15(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x38(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x48(%rbp)
  mov    %rdx,%rax
  test   %rax,%rax
  jne    L122
  mov    $0x20,%edi
  call   <putchar@plt>
  movl   $0x0,-0x24(%rbp)
  jmp    L87
L172:
  mov    -0x24(%rbp),%eax
  cltq
  movzbl -0x20(%rbp,%rax,1),%eax
  mov    %al,-0x25(%rbp)
  cmpb   $0x1f,-0x25(%rbp)
  jbe    L171
  cmpb   $0x7e,-0x25(%rbp)
  ja     L171
  movzbl -0x25(%rbp),%eax
  jmp    L151
L171:
  mov    $0x2e,%eax
L151:
  mov    %eax,%edi
  call   <putchar@plt>
  addl   $0x1,-0x24(%rbp)
L87:
  mov    -0x24(%rbp),%eax
  cltq
  cmp    %rax,-0x48(%rbp)
  ja     L172
  mov    $0xa,%edi
  call   <putchar@plt>
  jmp    L122
L161:
  mov    -0x38(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x48(%rbp)
  mov    %rdx,%rax
  test   %rax,%rax
  je     L158
  movl   $0x0,-0x24(%rbp)
  jmp    L175
L167:
  mov    $0x20,%edi
  call   <putchar@plt>
  addl   $0x1,-0x24(%rbp)
L175:
  mov    -0x24(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x38(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x48(%rbp)
  mov    %rdx,%rsi
  mov    -0x48(%rbp),%rax
  sub    %rsi,%rax
  mov    %rax,%rdx
  mov    %rdx,%rax
  add    %rax,%rax
  add    %rdx,%rax
  cmp    %rax,%rcx
  jb     L167
  mov    $0x20,%edi
  call   <putchar@plt>
  movl   $0x0,-0x24(%rbp)
  jmp    L114
L18:
  mov    -0x24(%rbp),%eax
  cltq
  movzbl -0x20(%rbp,%rax,1),%eax
  mov    %al,-0x25(%rbp)
  cmpb   $0x1f,-0x25(%rbp)
  jbe    L5
  cmpb   $0x7e,-0x25(%rbp)
  ja     L5
  movzbl -0x25(%rbp),%eax
  jmp    L9
L5:
  mov    $0x2e,%eax
L9:
  mov    %eax,%edi
  call   <putchar@plt>
  addl   $0x1,-0x24(%rbp)
L114:
  mov    -0x24(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x38(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x48(%rbp)
  mov    %rdx,%rax
  cmp    %rax,%rcx
  jb     L18
  mov    $0xa,%edi
  call   <putchar@plt>
L158:
  nop
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L15
  call   <__stack_chk_fail@plt>
L15:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: label: D1
datatype: string
name: unpack_data
arguments: label: D15
datatype: string

tool: D1: %06lX: 

tool: D15: %02X%c

assistant: ```c
void display_byte(unsigned long start, unsigned long endaddr, unsigned long width) {
  int index;
  unsigned char r;
  char pc[16];
  for (;;) {
    if (start < endaddr) {
      r = rd_byte((unsigned char *)start);
      if ((start % width) == 0)
        printf("%06lX: ", start);
      pc[start % width] = r;
      start++;
      printf("%02X%c", r, ' ');
      if ((start % width) == 0) {
        printf(" ");
        for (index = 0; (index < width); index++) {
          r = pc[index];
          printf("%c", ((r >= 0x20) && (r <= 0x7E)) ? r : '.');
        }
        printf("\n");
      }
    } else {
      if (start % width) {
        for (index = 0; (index < (3 * (width - start % width))); index++)
          printf(" ");
        printf(" ");
        for (index = 0; (index < (start % width)); index++) {
          r = pc[index];
          printf("%c", ((r >= 0x20) && (r <= 0x7E)) ? r : '.');
        }
        printf("\n");
      }
      goto endbyte;
    }
  }
endbyte:
  return;
}
```