const char *z2 = z;
  while( *z2 ){ z2++; }
  return 0x3fffffff & (int)(z2 - z);
}

/*
** Return the length of a string in characters.  Multibyte UTF8 characters
** count as a single character for single-width characters, or as two
** characters for double-width characters.
*/
static int strlenChar(const char *z){
  int n = 0;
  while( *z ){
    if( (0x80&z[0])==0 ){
      n++;
      z++;
    }else{
      int u = 0;
      int len = decodeUtf8((const u8*)z, &u);
      z += len;
      n += cli_wcwidth(u);
    }
  }
  return n;
}

/*
** Return open FILE * if zFile exists, can be opened for read
** and is an ordinary file or a character stream source.