double nan(char *__tagb)

{

  size_t sVar1;

  double dVar2;

  if (*__tagb == '\0') {

    dVar2 = NAN;

  }

  else {

    sVar1 = strlen(__tagb);

    sprintf(&stack0xffffffe0 + -(sVar1 + 0x14 & 0xfffffff8),"NAN(%s)",__tagb)   //possible issue identified - semgrep

    dVar2 = strtod(&stack0xffffffe0 + -(sVar1 + 0x14 & 0xfffffff8),(char **)0x0);

  }

  return dVar2;

}