user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<tcpdump>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %esi,-0x4c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    -0x48(%rbp),%rbx
  movl   $0x0,-0x38(%rbp)
  jmp    L123
L18:
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  test   %eax,%eax
  jne    L159
  cmpl   $0x0,-0x38(%rbp)
  je     L94
  movl   $0x0,-0x34(%rbp)
  jmp    L103
L143:
  mov    -0x34(%rbp),%eax
  cltq
  movzbl -0x30(%rbp,%rax,1),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <putchar@plt>
  addl   $0x1,-0x34(%rbp)
L103:
  cmpl   $0xf,-0x34(%rbp)
  jle    L143
L94:
  mov    -0x38(%rbp),%eax
  mov    %eax,%esi
  lea    D1(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
L159:
  lea    0x1(%rbx),%rax
  movzbl (%rax),%eax
  movzbl %al,%edx
  movzbl (%rbx),%eax
  movzbl %al,%eax
  mov    %eax,%esi
  lea    D28(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movzbl (%rbx),%eax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <isprint@plt>
  test   %eax,%eax
  je     L81
  movzbl (%rbx),%eax
  cmp    $0x1f,%al
  jbe    L81
  movzbl (%rbx),%edx
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  mov    %eax,%eax
  mov    %dl,-0x30(%rbp,%rax,1)
  jmp    L19
L81:
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  mov    %eax,%eax
  movb   $0x2e,-0x30(%rbp,%rax,1)
L19:
  add    $0x1,%rbx
  addl   $0x1,-0x38(%rbp)
  movzbl (%rbx),%eax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <isprint@plt>
  test   %eax,%eax
  je     L151
  movzbl (%rbx),%eax
  cmp    $0x1f,%al
  jbe    L151
  movzbl (%rbx),%edx
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  mov    %eax,%eax
  mov    %dl,-0x30(%rbp,%rax,1)
  jmp    L174
L151:
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  mov    %eax,%eax
  movb   $0x2e,-0x30(%rbp,%rax,1)
L174:
  add    $0x1,%rbx
  addl   $0x1,-0x38(%rbp)
L123:
  mov    -0x38(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jb     L18
  mov    -0x4c(%rbp),%eax
  and    $0x1,%eax
  test   %eax,%eax
  je     L77
  lea    D4(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L77
L59:
  lea    D37(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  mov    %eax,%eax
  movb   $0x20,-0x30(%rbp,%rax,1)
  addl   $0x1,-0x38(%rbp)
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  mov    %eax,%eax
  movb   $0x20,-0x30(%rbp,%rax,1)
  addl   $0x1,-0x38(%rbp)
L77:
  mov    -0x38(%rbp),%eax
  and    $0xf,%eax
  test   %eax,%eax
  jne    L59
  movl   $0x0,-0x34(%rbp)
  jmp    L145
L30:
  mov    -0x34(%rbp),%eax
  cltq
  movzbl -0x30(%rbp,%rax,1),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <putchar@plt>
  addl   $0x1,-0x34(%rbp)
L145:
  cmpl   $0xf,-0x34(%rbp)
  jle    L30
  mov    $0xa,%edi
  call   <putchar@plt>
  nop
  mov    -0x18(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L179
  call   <__stack_chk_fail@plt>
L179:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D1
datatype: string
name: extract_symbolic_data
arguments: data_label: D28
datatype: string
name: extract_symbolic_data
arguments: data_label: D4
datatype: string
name: extract_symbolic_data
arguments: data_label: D37
datatype: string

tool: D1: 
0x%4.4X	

tool: D28: %2.2X%2.2X 

tool: D4:    

tool: D37:      

assistant: ```c
void tcpdump(buffer, len) unsigned char *buffer;
unsigned int len;
{
  register unsigned char *bufptr;
  unsigned int zipper;
  int x;
  char bleh[16];
  bufptr = buffer;
  for (zipper = 0; zipper < len; zipper++) {
    if (!(zipper & 0x0f)) {
      if (zipper) {
        for (x = 0; x < 16; x++) {
          putchar(bleh[x]);
        }
      }
      printf("\n0x%4.4X\t", zipper);
    }
    printf("%2.2X%2.2X ", (bufptr[0] & 0xff), (bufptr[1] & 0xff));
    if (isprint(bufptr[0]) && (bufptr[0] > 31)) {
      bleh[zipper & 0x0f] = bufptr[0];
    } else {
      bleh[zipper & 0x0f] = '.';
    }
    bufptr++;
    zipper++;
    if (isprint(bufptr[0]) && (bufptr[0] > 31)) {
      bleh[zipper & 0x0f] = bufptr[0];
    } else {
      bleh[zipper & 0x0f] = '.';
    }
    bufptr++;
  }
  if ((len & 0x01) == 0x01) {
    printf("\b\b\b   ");
  }
  while ((zipper & 0x0f)) {
    printf("     ");
    bleh[zipper & 0x0f] = ' ';
    zipper++;
    bleh[zipper & 0x0f] = ' ';
    zipper++;
  }
  for (x = 0; x < 16; x++) {
    putchar(bleh[x]);
  }
  putchar('\n');
}
```