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   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,%rbp
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  call   <strlen@plt>
  mov    $0x0,%ebx
  cmp    $0x12,%eax
  jg     L168
  mov    $0x0,%ebx
  mov    $0x0,%r13d
  mov    $0x0,%r12d
  mov    $0x0,%r14d
  jmp    L122
L80:
  movzbl 0x0(%rbp,%rbx,1),%eax
  and    $0xffffffdf,%eax
  mov    %r14d,%r12d
  cmp    $0x58,%al
  jne    L112
L98:
  add    $0x1,%r13d
  mov    %r14d,%r12d
L112:
  add    $0x1,%rbx
L122:
  mov    %rbp,%rdi
  call   <strlen@plt>
  mov    %eax,%edx
  test   %r12d,%r12d
  sete   %al
  cmp    %ebx,%edx
  jle    L201
  test   %al,%al
  je     L201
  movsbl 0x0(%rbp,%rbx,1),%edi
  call   <isxdigit@plt>
  test   %eax,%eax
  jne    L80
  movzbl 0x0(%rbp,%rbx,1),%eax
  and    $0xffffffdf,%eax
  mov    $0x1,%r12d
  cmp    $0x58,%al
  je     L98
  jmp    L112
L201:
  cmp    $0x1,%r13d
  jne    L242
  test   %al,%al
  je     L242
  movzbl 0x0(%rbp),%eax
  mov    %eax,%edx
  and    $0xffffffdf,%edx
  mov    $0x3,%ebx
  cmp    $0x58,%dl
  je     L168
  cmp    $0x30,%al
  je     L220
L242:
  lea    0x10(%rsp),%rdi
  mov    $0x10,%esi
  call   <bzero@plt>
  mov    $0x2f,%esi
  mov    %rbp,%rdi
  call   <strchr@plt>
  test   %rax,%rax
  je     L72
  movzbl 0x0(%rbp),%edx
  cmp    $0x2f,%dl
  je     L151
  mov    $0x1,%eax
  lea    0xf(%rsp),%rdi
L132:
  mov    %dl,(%rdi,%rax,1)
  movzbl 0x0(%rbp,%rax,1),%edx
  cmp    $0xe,%eax
  setle  %sil
  cmp    $0x2f,%dl
  setne  %cl
  add    $0x1,%rax
  test   %cl,%sil
  jne    L132
L151:
  lea    0xc(%rsp),%rsi
  lea    0x10(%rsp),%rdi
  call   <quadtonum@plt>
  mov    $0x0,%ebx
  test   %rax,%rax
  jne    L168
  mov    $0x2f,%esi
  mov    %rbp,%rdi
  call   <strchr@plt>
  mov    %rax,%rbp
  test   %rax,%rax
  je     L329
  lea    0x1(%rax),%r13
  mov    %r13,%rdi
  call   <strlen@plt>
  mov    $0x0,%ebx
  test   %eax,%eax
  jle    L168
  mov    %r13,%rdi
  call   <strlen@plt>
  cmp    $0x2,%eax
  jg     L168
  cmpb   $0x2e,0x1(%rbp)
  je     L168
  cmpb   $0x2e,0x2(%rbp)
  je     L168
  mov    $0x0,%r15d
  lea    D5(%rip),%r14
L368:
  mov    %r13,%rdi
  call   <strlen@plt>
  cmp    %r15d,%eax
  jg     L113
  mov    %r13,%rdi
  call   <atoi@plt>
  cmp    $0x20,%eax
  setbe  %bl
  movzbl %bl,%ebx
  add    %ebx,%ebx
  jmp    L168
L220:
  movzbl 0x1(%rbp),%eax
  and    $0xffffffdf,%eax
  cmp    $0x58,%al
  jne    L242
  jmp    L168
L72:
  movb   $0x0,0x1f(%rsp)
  lea    0x10(%rsp),%rdi
  mov    $0xf,%edx
  mov    %rbp,%rsi
  call   <strncpy@plt>
  jmp    L151
L329:
  mov    0xc(%rsp),%esi
  mov    $0x1f,%ecx
  mov    $0x0,%eax
  mov    $0x1,%edi
  jmp    L364
L291:
  cmp    $0x1,%eax
  jne    L46
  mov    %esi,%eax
  sar    %cl,%eax
  and    $0x1,%eax
  add    $0x1,%eax
L46:
  sub    $0x1,%ecx
  cmp    $0xffffffff,%ecx
  je     L308
L364:
  test   %eax,%eax
  jne    L291
  mov    %esi,%edx
  sar    %cl,%edx
  and    $0x1,%edx
  mov    %edi,%eax
  sub    %edx,%eax
  jmp    L46
L308:
  cmp    $0x2,%eax
  setne  %bl
  movzbl %bl,%ebx
  lea    -0x1(%rbx,%rbx,1),%ebx
L168:
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L181
  mov    %ebx,%eax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L82:
  movzbl (%r14,%r12,1),%eax
  cmp    %al,0x1(%rbp,%r15,1)
  sete   %bl
  movzbl %bl,%ebx
  add    $0x1,%r12
L369:
  mov    %r14,%rdi
  call   <strlen@plt>
  test   %ebx,%ebx
  jne    L351
  cmp    %r12d,%eax
  jg     L82
L351:
  add    $0x1,%r15
  test   %ebx,%ebx
  jne    L368
  jmp    L168
L113:
  mov    $0x0,%r12d
  mov    $0x0,%ebx
  jmp    L369
L181:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_label: D5
datatype: string

tool: D5: 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;
}
```