Fixed compiler warnings detected by option -Wshadow and -Wunused:

- Removed not used variables and functions
- Added #ifdef around code that is not used
- Renamed variables and functions to avoid conflicts
- Removed some not used arguments

Fixed some class/struct warnings in ndb
Added define IS_LONGDATA() to simplify code in libmysql.c

I did run gcov on the changes and added 'purecov' comments on almost all lines that was not just variable name changes

cmd-line-utils/readline/display.c

@@ -426,7 +426,7 @@ rl_redisplay ()
 #if defined (HANDLE_MULTIBYTE)
   wchar_t wc;
   size_t wc_bytes;
-  int wc_width;
+  int wc_width= 0;
   mbstate_t ps;
   int _rl_wrapped_multicolumn = 0;
 #endif

cmd-line-utils/readline/histexpand.c

@@ -560,12 +560,12 @@ history_expand_internal (string, start, end_index_ptr, ret_string, current_line)
 #if defined (HANDLE_MULTIBYTE)
       if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
 	{
-	  int c, l;
+	  int chr, l;
 	  l = _rl_find_prev_mbchar (string, i, MB_FIND_ANY);
-	  c = string[l];
+	  chr = string[l];
 	  /* XXX - original patch had i - 1 ???  If i == 0 it would fail. */
-	  if (i && (c == '\'' || c == '"'))
-	    quoted_search_delimiter = c;
+	  if (i && (chr == '\'' || chr == '"'))
+	    quoted_search_delimiter = chr;
 	}
       else
 #endif /* HANDLE_MULTIBYTE */	  

cmd-line-utils/readline/input.c

@@ -529,17 +529,17 @@ _rl_read_mbchar (mbchar, size)
    may be FIRST.  Used by the search functions, among others.  Very similar
    to _rl_read_mbchar. */
 int
-_rl_read_mbstring (first, mb, mblen)
+_rl_read_mbstring (first, mb, mb_len)
      int first;
      char *mb;
-     int mblen;
+     int mb_len;
 {
   int i, c;
   mbstate_t ps;
 
   c = first;
-  memset (mb, 0, mblen);
-  for (i = 0; i < mblen; i++)
+  memset (mb, 0, mb_len);
+  for (i = 0; i < mb_len; i++)
     {
       mb[i] = (char)c;
       memset (&ps, 0, sizeof (mbstate_t));

cmd-line-utils/readline/text.c

@@ -1002,12 +1002,12 @@ _rl_rubout_char (count, key)
 	}
       else
 	{
-	  int orig_point;
+	  int orig_point2;
 
-	  orig_point = rl_point;
+	  orig_point2 = rl_point;
 	  rl_point = _rl_find_prev_mbchar (rl_line_buffer, rl_point, MB_FIND_NONZERO);
 	  c = rl_line_buffer[rl_point];
-	  rl_delete_text (rl_point, orig_point);
+	  rl_delete_text (rl_point, orig_point2);
 	}
 #endif /* HANDLE_MULTIBYTE */
 

cmd-line-utils/readline/vi_mode.c

@@ -672,7 +672,7 @@ _rl_vi_change_mbchar_case (count)
 {
   wchar_t wc;
   char mb[MB_LEN_MAX+1];
-  int mblen;
+  int local_mblen;
   mbstate_t ps;
 
   memset (&ps, 0, sizeof (mbstate_t));
@@ -695,9 +695,9 @@ _rl_vi_change_mbchar_case (count)
       /* Vi is kind of strange here. */
       if (wc)
 	{
-	  mblen = wcrtomb (mb, wc, &ps);
-	  if (mblen >= 0)
-	    mb[mblen] = '\0';
+	  local_mblen = wcrtomb (mb, wc, &ps);
+	  if (local_mblen >= 0)
+	    mb[local_mblen] = '\0';
 	  rl_begin_undo_group ();
 	  rl_delete (1, 0);
 	  rl_insert_text (mb);