user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<filtblocktag>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x140,%rsp
  mov    %rdi,-0x138(%rbp)
  mov    %rsi,-0x140(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x12c(%rbp)
  movl   $0x0,-0x128(%rbp)
  movl   $0x0,-0x124(%rbp)
  movl   $0x0,-0x118(%rbp)
  movl   $0x1,-0x120(%rbp)
  movl   $0x0,-0x11c(%rbp)
  lea    -0x112(%rbp),%rax
  mov    $0x2,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  lea    -0x110(%rbp),%rax
  mov    $0x100,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  mov    -0x140(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %al,-0x12d(%rbp)
  jmp    L97
L159:
  movzbl -0x12d(%rbp),%eax
  mov    %al,-0x112(%rbp)
  movzbl -0x112(%rbp),%eax
  movsbl %al,%eax
  cmp    $0x62,%eax
  je     L170
  cmp    $0x62,%eax
  jg     L103
  cmp    $0x3e,%eax
  je     L62
  cmp    $0x3e,%eax
  jg     L103
  cmp    $0x2f,%eax
  je     L8
  cmp    $0x3c,%eax
  jne    L103
  movl   $0x1,-0x124(%rbp)
  movl   $0x1,-0x11c(%rbp)
  cmpl   $0x0,-0x12c(%rbp)
  je     L40
  mov    -0x138(%rbp),%rdx
  lea    -0x110(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <fputs@plt>
  movl   $0x0,-0x12c(%rbp)
  lea    -0x110(%rbp),%rax
  mov    $0x100,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
L40:
  lea    -0x112(%rbp),%rdx
  lea    -0x110(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
  addl   $0x1,-0x12c(%rbp)
  jmp    L56
L62:
  lea    -0x112(%rbp),%rdx
  lea    -0x110(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
  cmpl   $0x1,-0x120(%rbp)
  jne    L168
  mov    -0x138(%rbp),%rdx
  lea    -0x110(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <fputs@plt>
L168:
  lea    -0x110(%rbp),%rax
  mov    $0x100,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  movl   $0x0,-0x12c(%rbp)
  movl   $0x0,-0x124(%rbp)
  movl   $0x1,-0x120(%rbp)
  movl   $0x0,-0x118(%rbp)
  movl   $0x0,-0x11c(%rbp)
  jmp    L56
L8:
  cmpl   $0x1,-0x124(%rbp)
  jne    L73
  cmpl   $0x1,-0x11c(%rbp)
  jne    L73
  movl   $0x1,-0x118(%rbp)
L73:
  lea    -0x112(%rbp),%rdx
  lea    -0x110(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
  addl   $0x1,-0x12c(%rbp)
  jmp    L56
L170:
  cmpl   $0x1,-0x11c(%rbp)
  jne    L147
  movl   $0x0,-0x120(%rbp)
L147:
  lea    -0x112(%rbp),%rdx
  lea    -0x110(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
  addl   $0x1,-0x12c(%rbp)
  jmp    L56
L103:
  lea    -0x112(%rbp),%rdx
  lea    -0x110(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
  movl   $0x0,-0x11c(%rbp)
  addl   $0x1,-0x12c(%rbp)
  nop
L56:
  mov    -0x140(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %al,-0x12d(%rbp)
  addl   $0x1,-0x128(%rbp)
L97:
  mov    D1(%rip),%rax
  movzbl (%rax),%eax
  cmp    %al,-0x12d(%rbp)
  jne    L159
  mov    -0x128(%rbp),%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L20
  call   <__stack_chk_fail@plt>
L20:
  leave
  ret
```

assistant: ```c
int filtblocktag(FILE *destination, FILE *source) {
  char curchar;
  char inputbuf[2];
  char outputbuf[256];
  int buflocation = 0;
  int charcount = 0;
  int intag = 0;
  int endtag = 0;
  int copytag = 1;
  int prevtag = 0;
  memset(inputbuf, 0, 2);
  memset(outputbuf, 0, 256);
  curchar = fgetc(source);
  while (curchar != EOF) {
    inputbuf[0] = curchar;
    switch (inputbuf[0]) {
    case '<':
      intag = 1;
      prevtag = 1;
      if (buflocation != 0) {
        fputs(outputbuf, destination);
        buflocation = 0;
        memset(outputbuf, 0, 256);
      }
      strcat(outputbuf, inputbuf);
      buflocation++;
      break;
    case '>':
      strcat(outputbuf, inputbuf);
      if (copytag == 1)
        fputs(outputbuf, destination);
      memset(outputbuf, 0, 256);
      buflocation = 0;
      intag = 0;
      copytag = 1;
      endtag = 0;
      prevtag = 0;
      break;
    case '/':
      if (intag == 1 && prevtag == 1) {
        endtag = 1;
      }
      strcat(outputbuf, inputbuf);
      buflocation++;
      break;
    case 'b':
      if (prevtag == 1)
        copytag = 0;
      strcat(outputbuf, inputbuf);
      buflocation++;
      break;
    default:
      strcat(outputbuf, inputbuf);
      prevtag = 0;
      buflocation++;
      break;
    }
    curchar = fgetc(source);
    charcount++;
  }
  return charcount;
}
```