user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<validate_netmask>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cmp    $0x12,%eax
  jle    L184
  mov    $0x0,%eax
  jmp    L540
L184:
  movl   $0x0,-0x38(%rbp)
  movl   $0x0,-0x34(%rbp)
  movl   $0x0,-0x30(%rbp)
  jmp    L451
L496:
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isxdigit@plt>
  test   %eax,%eax
  jne    L208
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x78,%al
  je     L208
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x58,%al
  je     L208
  movl   $0x1,-0x34(%rbp)
L208:
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x78,%al
  je     L283
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x58,%al
  jne    L332
L283:
  addl   $0x1,-0x30(%rbp)
  movl   $0x0,-0x34(%rbp)
L332:
  addl   $0x1,-0x38(%rbp)
L451:
  mov    -0x48(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cmp    %eax,-0x38(%rbp)
  jge    L150
  cmpl   $0x0,-0x34(%rbp)
  je     L496
L150:
  movl   $0x0,-0x38(%rbp)
  cmpl   $0x0,-0x34(%rbp)
  jne    L13
  cmpl   $0x1,-0x30(%rbp)
  jne    L13
  movl   $0x0,-0x38(%rbp)
  mov    -0x48(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x78,%al
  je     L2
  mov    -0x48(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x58,%al
  jne    L507
L2:
  movl   $0x1,-0x38(%rbp)
L507:
  cmpl   $0x0,-0x38(%rbp)
  jne    L13
  mov    -0x48(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x30,%al
  jne    L13
  mov    -0x48(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0x78,%al
  je     L543
  mov    -0x48(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0x58,%al
  jne    L13
L543:
  movl   $0x1,-0x38(%rbp)
L13:
  cmpl   $0x1,-0x38(%rbp)
  jne    L61
  mov    $0x3,%eax
  jmp    L540
L61:
  lea    -0x20(%rbp),%rax
  mov    $0x10,%esi
  mov    %rax,%rdi
  call   <bzero@plt>
  mov    -0x48(%rbp),%rax
  mov    $0x2f,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  test   %rax,%rax
  je     L521
  movl   $0x0,-0x38(%rbp)
  jmp    L258
L282:
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x38(%rbp),%eax
  cltq
  mov    %dl,-0x20(%rbp,%rax,1)
  addl   $0x1,-0x38(%rbp)
L258:
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  je     L508
  cmpl   $0xe,-0x38(%rbp)
  jle    L282
  jmp    L508
L521:
  movb   $0x0,-0x11(%rbp)
  mov    -0x48(%rbp),%rcx
  lea    -0x20(%rbp),%rax
  mov    $0xf,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
L508:
  lea    -0x3c(%rbp),%rdx
  lea    -0x20(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <quadtonum@plt>
  test   %rax,%rax
  je     L299
  mov    $0x0,%eax
  jmp    L540
L299:
  mov    -0x48(%rbp),%rax
  mov    $0x2f,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L254
  movl   $0x0,-0x34(%rbp)
  movl   $0x0,-0x38(%rbp)
  jmp    L182
L178:
  cmpl   $0x0,-0x34(%rbp)
  jne    L289
  mov    -0x3c(%rbp),%edx
  mov    $0x1f,%eax
  sub    -0x38(%rbp),%eax
  mov    %eax,%ecx
  sar    %cl,%edx
  mov    %edx,%eax
  and    $0x1,%eax
  test   %eax,%eax
  jne    L289
  movl   $0x1,-0x34(%rbp)
L289:
  cmpl   $0x1,-0x34(%rbp)
  jne    L422
  mov    -0x3c(%rbp),%edx
  mov    $0x1f,%eax
  sub    -0x38(%rbp),%eax
  mov    %eax,%ecx
  sar    %cl,%edx
  mov    %edx,%eax
  and    $0x1,%eax
  test   %eax,%eax
  je     L422
  movl   $0x2,-0x34(%rbp)
L422:
  addl   $0x1,-0x38(%rbp)
L182:
  cmpl   $0x1f,-0x38(%rbp)
  jle    L178
  cmpl   $0x2,-0x34(%rbp)
  jne    L171
  mov    $0xffffffff,%eax
  jmp    L540
L171:
  mov    $0x1,%eax
  jmp    L540
L254:
  addq   $0x1,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  test   %eax,%eax
  jle    L8
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cmp    $0x2,%eax
  jle    L410
L8:
  mov    $0x0,%eax
  jmp    L540
L410:
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2e,%al
  je     L317
  mov    -0x28(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0x2e,%al
  jne    L194
L317:
  mov    $0x0,%eax
  jmp    L540
L194:
  movl   $0x0,-0x38(%rbp)
  movl   $0x0,-0x34(%rbp)
  jmp    L134
L198:
  movl   $0x0,-0x30(%rbp)
  movl   $0x0,-0x34(%rbp)
  jmp    L542
L196:
  mov    -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x30(%rbp),%eax
  cltq
  lea    D18(%rip),%rcx
  movzbl (%rax,%rcx,1),%eax
  cmp    %al,%dl
  jne    L489
  movl   $0x1,-0x34(%rbp)
L489:
  addl   $0x1,-0x30(%rbp)
L542:
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cmp    %eax,-0x30(%rbp)
  jge    L548
  cmpl   $0x0,-0x34(%rbp)
  je     L196
L548:
  cmpl   $0x0,-0x34(%rbp)
  jne    L131
  mov    $0x0,%eax
  jmp    L540
L131:
  addl   $0x1,-0x38(%rbp)
L134:
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cmp    %eax,-0x38(%rbp)
  jl     L198
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <atoi@plt>
  mov    %eax,-0x2c(%rbp)
  cmpl   $0x0,-0x2c(%rbp)
  js     L528
  cmpl   $0x20,-0x2c(%rbp)
  jle    L529
L528:
  mov    $0x0,%eax
  jmp    L540
L529:
  mov    $0x2,%eax
L540:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L308
  call   <__stack_chk_fail@plt>
L308:
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: data_tag: D18
type_guessed: string

tool: D18: 0123456789.

assistant: ```c
int validate_netmask(char *in_addr) {
  int x, y, z, m;
  char addr[16];
  char *sl;
  u_int32_t sm;
  if (strlen(in_addr) > 18)
    return 0;
  x = 0;
  y = 0;
  z = 0;
  while (x < strlen(in_addr) && !y) {
    if (!isxdigit(in_addr[x]) && in_addr[x] != 'x' && in_addr[x] != 'X')
      y = 1;
    if (in_addr[x] == 'x' || in_addr[x] == 'X') {
      z++;
      y = 0;
    }
    x++;
  }
  x = 0;
  if (!y && z == 1) {
    x = 0;
    if (in_addr[0] == 'x' || in_addr[0] == 'X')
      x = 1;
    if (!x) {
      if (in_addr[0] == '0' && (in_addr[1] == 'x' || in_addr[1] == 'X'))
        x = 1;
    }
  }
  if (x == 1)
    return 3;
  bzero((char *)addr, sizeof(addr));
  if (strstr(in_addr, "/")) {
    x = 0;
    while (in_addr[x] != '/' && x < 15) {
      addr[x] = in_addr[x];
      x++;
    }
  } else {
    strncpy(addr, in_addr, sizeof(addr) - 1 + (addr[sizeof(addr) - 1] = '\0') * 0);
  }
  if (quadtonum(addr, &sm))
    return 0;
  if (!(sl = strstr(in_addr, "/"))) {
    y = 0;
    for (x = 0; x < 32; x++) {
      if (!y && !((sm >> (31 - x)) & 1))
        y = 1;
      if (y == 1 && ((sm >> (31 - x)) & 1))
        y = 2;
    }
    if (y == 2)
      return -1;
    return 1;
  }
  sl++;
  if (strlen(sl) < 1 || strlen(sl) > 2)
    return 0;
  if (sl[0] == '.' || sl[1] == '.')
    return 0;
  x = 0;
  y = 0;
  while (x < strlen(sl)) {
    z = 0;
    y = 0;
    while (z < strlen("0123456789.") && !y) {
      if (sl[x] == "0123456789."[z])
        y = 1;
      z++;
    }
    if (!y)
      return 0;
    x++;
  }
  m = atoi(sl);
  if (m < 0 || m > 32)
    return 0;
  return 2;
}
```