[Texmacs-dev] is_iso_alpha function

[skhilji]

Where did we get this function from? Whats magical about 128, 159, 189, 190, 
and 191? Aren't we assuming a certain character encoding with this function?

Salman


bool
is_iso_alpha (register char c)
{
  int i = ((int) ((unsigned char) c));
  return
    ((c >= 'a') && (c <= 'z')) ||
    ((c >= 'A') && (c <= 'Z')) ||
    ((i >= 128) && (i != 159) && (i != 189) && (i != 190) && (i != 191));
}