user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<process_filter>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x4b8,%rsp
  mov    %rdi,%rbx
  mov    %rsi,0x8(%rsp)
  mov    %rdx,%r13
  mov    %fs:0x28,%rax
  mov    %rax,0x4a8(%rsp)
  xor    %eax,%eax
  movl   $0x0,0x1c(%rsp)
  call   <strlen@plt>
  mov    %rax,%rbp
  movzbl (%rbx),%eax
  cmp    $0x26,%al
  sete   %dl
  cmp    $0x7c,%al
  sete   %cl
  or     %ecx,%edx
  cmp    $0x21,%al
  je     L188
  test   %dl,%dl
  je     L0
L188:
  cmp    $0x26,%al
  je     L190
  test   %dl,%dl
  jne    L216
  mov    0x0(%r13),%eax
  lea    0x1(%rax),%edx
  mov    %edx,0x0(%r13)
  cltq
  mov    0x8(%rsp),%rdi
  movb   $0xa2,(%rdi,%rax,1)
  jmp    L70
L190:
  mov    0x0(%r13),%eax
  lea    0x1(%rax),%edx
  mov    %edx,0x0(%r13)
  cltq
  mov    0x8(%rsp),%rdi
  movb   $0xa0,(%rdi,%rax,1)
L70:
  add    $0x1,%rbx
  lea    -0x1(%rbp),%eax
  test   %eax,%eax
  jle    L238
  lea    0x20(%rsp),%r15
  jmp    L232
L216:
  mov    0x0(%r13),%eax
  lea    0x1(%rax),%edx
  mov    %edx,0x0(%r13)
  cltq
  mov    0x8(%rsp),%rdi
  movb   $0xa1,(%rdi,%rax,1)
  jmp    L70
L52:
  add    $0x1,%ecx
  jmp    L41
L278:
  cmp    $0x29,%dl
  je     L63
L41:
  lea    0x1(%rax),%rdx
  sub    %rbx,%rax
  cmp    %rsi,%rax
  jg     L246
  mov    %rdx,%rax
L93:
  movzbl (%rax),%edx
  cmp    $0x28,%dl
  je     L52
  test   %ecx,%ecx
  jle    L278
  cmp    $0x29,%dl
  jne    L278
  sub    $0x1,%ecx
  jmp    L41
L63:
  lea    0x1(%rax),%rbx
  jmp    L209
L246:
  mov    %rdx,%rbx
L209:
  mov    %rbx,%r14
  sub    %rdi,%r14
  lea    -0x1(%r14),%r12d
  mov    %r12d,%edx
  mov    %rdi,%rsi
  mov    %r15,%rdi
  call   <memcpy@plt>
  movslq %r12d,%r12
  movb   $0x0,0x20(%rsp,%r12,1)
  lea    0x1c(%rsp),%rdx
  lea    0xa0(%rsp),%rsi
  mov    %r15,%rdi
  call   <process_filter>
  sub    %r14d,%ebp
  mov    %ebp,%eax
  test   %ebp,%ebp
  jle    L219
L232:
  lea    0x1(%rbx),%rdi
  lea    -0x1(%rax),%ebp
  movslq %ebp,%rsi
  test   %rsi,%rsi
  js     L14
  mov    %rdi,%rax
  mov    $0x0,%ecx
  jmp    L93
L14:
  mov    %rdi,%rbx
  jmp    L209
L219:
  mov    0x1c(%rsp),%esi
  cmp    $0x7f,%esi
  jle    L268
  cmp    $0xff,%esi
  jg     L254
  mov    0x0(%r13),%eax
  lea    0x1(%rax),%edx
  mov    %edx,0x0(%r13)
  cltq
  mov    0x8(%rsp),%rdi
  movb   $0x81,(%rdi,%rax,1)
  mov    0x0(%r13),%eax
  lea    0x1(%rax),%edx
  mov    %edx,0x0(%r13)
  cltq
  mov    %sil,(%rdi,%rax,1)
  jmp    L223
L238:
  mov    $0x0,%esi
L268:
  mov    0x0(%r13),%eax
  lea    0x1(%rax),%edx
  mov    %edx,0x0(%r13)
  cltq
  mov    0x8(%rsp),%rdi
  mov    %sil,(%rdi,%rax,1)
L223:
  lea    0xa0(%rsp),%rax
  movslq 0x0(%r13),%rdi
  add    0x8(%rsp),%rdi
  mov    %esi,%edx
  mov    %rax,%rsi
  call   <memcpy@plt>
  mov    0x1c(%rsp),%eax
  add    %eax,0x0(%r13)
L200:
  mov    0x4a8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L2
  add    $0x4b8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L254:
  mov    $0x0,%edx
L137:
  mov    %edx,%eax
  add    $0x1,%edx
  lea    0x0(,%rdx,8),%ecx
  mov    %esi,%edi
  sar    %cl,%edi
  test   %edi,%edi
  jg     L137
  mov    0x0(%r13),%ecx
  lea    0x1(%rcx),%edi
  mov    %edi,0x0(%r13)
  movslq %ecx,%rcx
  lea    -0x80(%rdx),%edi
  mov    0x8(%rsp),%rbx
  mov    %dil,(%rbx,%rcx,1)
  test   %edx,%edx
  jle    L223
  lea    0x0(,%rax,8),%ecx
L18:
  mov    0x0(%r13),%eax
  lea    0x1(%rax),%edx
  mov    %edx,0x0(%r13)
  cltq
  mov    %esi,%edx
  sar    %cl,%edx
  mov    0x8(%rsp),%rdi
  mov    %dl,(%rdi,%rax,1)
  sub    $0x8,%ecx
  cmp    $0xfffffff8,%ecx
  jne    L18
  jmp    L223
L0:
  lea    0x20(%rsp),%r12
  mov    %ebp,%edx
  mov    %rbx,%rsi
  mov    %r12,%rdi
  call   <memcpy@plt>
  movslq %ebp,%rax
  movb   $0x0,0x20(%rsp,%rax,1)
  mov    %r13,%rdx
  mov    0x8(%rsp),%rsi
  mov    %r12,%rdi
  call   <create_ber_filter@plt>
  jmp    L200
L2:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void process_filter(char *expression, char *b_filt, int *filt_len) {
  char *filt_p, *end_p, buff[128], b_buff[1024];
  int r, object_len, buff_len = 0;
  int count;
  object_len = (int)strlen(expression);
  filt_p = expression;
  if ((*filt_p == '&') || (*filt_p == '|') || (*filt_p == '!')) {
    if (*filt_p == '&')
      b_filt[(*filt_len)++] = 0xa0;
    else if (*filt_p == '|')
      b_filt[(*filt_len)++] = 0xa1;
    else if (*filt_p == '!')
      b_filt[(*filt_len)++] = 0xa2;
    ++filt_p;
    --object_len;
    while (object_len > 0) {
      ++filt_p;
      --object_len;
      end_p = filt_p;
      count = 0;
      while (end_p - filt_p - 1 < object_len) {
        if (*end_p == '(')
          ++count;
        else if (*end_p == ')' && count > 0)
          --count;
        else if (*end_p == ')') {
          ++end_p;
          break;
        }
        ++end_p;
      }
      r = (int)(end_p - filt_p - 1);
      memcpy(buff, filt_p, r);
      buff[r] = 0;
      process_filter(buff, b_buff, &buff_len);
      object_len -= (end_p - filt_p);
      filt_p = end_p;
    }
    {
      if (buff_len < 128) {
        b_filt[(*filt_len)++] = buff_len;
      } else {
        if (buff_len < 256) {
          b_filt[(*filt_len)++] = 0x80 + 1;
          b_filt[(*filt_len)++] = buff_len;
        } else {
          r = 0;
          while ((buff_len >> (r * 8)) > 0)
            r++;
          b_filt[(*filt_len)++] = 0x80 + r;
          while (r > 0) {
            r--;
            b_filt[(*filt_len)++] = (char)(buff_len >> (r * 8));
          }
        }
      }
    }
    memcpy(&b_filt[*filt_len], b_buff, buff_len);
    *filt_len += buff_len;
  } else {
    memcpy(buff, filt_p, object_len);
    buff[object_len] = 0;
    create_ber_filter(buff, b_filt, filt_len);
  }
}
```