// Note: isalpha(int c),  toupper(int c), tolower(int c), isspace(int c)
// If c is not an unsigned char value, or EOF, the behaviour of these functions
// is undefined.
csStringBase& csStringBase::Downcase()
{
  char* p = GetDataMutable();
  if (p != 0)
  {
    char const* const pN = p + Length();
    for ( ; p < pN; p++)
      if (isalpha((unsigned char)(*p)))
        *p = (char)tolower((unsigned char)(*p));
  }
  return *this;
}

// Note: isalpha(int c),  toupper(int c), tolower(int c), isspace(int c)
// If c is not an unsigned char value, or EOF, the behaviour of these functions
// is undefined.
csStringBase& csStringBase::Upcase()
{
  char* p = GetDataMutable();
  if (p != 0)
  {
    char const* const pN = p + Length();
    for ( ; p < pN; p++)
      if (isalpha((unsigned char)(*p)))
        *p = (char)toupper((unsigned char)(*p));
  }
  return *this;
}