extra correction of check_db_name, check_table_name and check_column_name

sql/table.cc

@@ -1140,7 +1140,7 @@ char *get_field(MEM_ROOT *mem, TABLE *table, uint fieldnr)
 bool check_db_name(char *name)
 {
   char *start=name;
-  bool space= false;
+  bool last_char_is_space= FALSE;
 
   if (lower_case_table_names)
     casedn_str(name);
@@ -1148,7 +1148,7 @@ bool check_db_name(char *name)
   while (*name)
   {
 #if defined(USE_MB) && defined(USE_MB_IDENT)
-    space= my_isspace(default_charset_info, *name);
+    last_char_is_space= my_isspace(default_charset_info, *name);
     if (use_mb(default_charset_info))
     {
       int len=my_ismbchar(default_charset_info, name, name+MBMAXLEN);
@@ -1159,16 +1159,14 @@ bool check_db_name(char *name)
       }
     }
 #else
-    space= *name==' ';
+    last_char_is_space= *name==' ';
 #endif
     if (*name == '/' || *name == '\\' || *name == FN_LIBCHAR ||
 	*name == FN_EXTCHAR)
       return 1;
     name++;
   }
-  if (space)
-    return 1;
-  return name[-1]==' ' || (uint) (name - start) > NAME_LEN;
+  return last_char_is_space || (uint) (name - start) > NAME_LEN;
 }
 
 
@@ -1186,7 +1184,7 @@ bool check_table_name(const char *name, uint length)
   if (!length || length > NAME_LEN)
     return 1;
 #if defined(USE_MB) && defined(USE_MB_IDENT)
-  bool space= false;
+  bool last_char_is_space= FALSE;
 #else
   if (name[length-1]==' ')
     return 1;
@@ -1195,7 +1193,7 @@ bool check_table_name(const char *name, uint length)
   while (name != end)
   {
 #if defined(USE_MB) && defined(USE_MB_IDENT)
-    space= my_isspace(default_charset_info, *name);
+    last_char_is_space= my_isspace(default_charset_info, *name);
     if (use_mb(default_charset_info))
     {
       int len=my_ismbchar(default_charset_info, name, end);
@@ -1211,21 +1209,21 @@ bool check_table_name(const char *name, uint length)
     name++;
   }
 #if defined(USE_MB) && defined(USE_MB_IDENT)
-  if (space)
-    return 1;
-#endif
+  return last_char_is_space;
+#else
   return 0;
+#endif
 }
 
 bool check_column_name(const char *name)
 {
   const char *start= name;
-  bool space= false;
-
+  bool last_char_is_space= false;
+  
   while (*name)
   {
 #if defined(USE_MB) && defined(USE_MB_IDENT)
-    space= my_isspace(default_charset_info, *name);
+    last_char_is_space= my_isspace(default_charset_info, *name);
     if (use_mb(default_charset_info))
     {
       int len=my_ismbchar(default_charset_info, name, name+MBMAXLEN);
@@ -1236,16 +1234,14 @@ bool check_column_name(const char *name)
       }
     }
 #else
-    space= *name==' ';
+    last_char_is_space= *name==' ';
 #endif
     if (*name == NAMES_SEP_CHAR)
       return 1;
     name++;
   }
-  if (space)
-    return 1;
   /* Error if empty or too long column name */
-  return (name == start || (uint) (name - start) > NAME_LEN);
+  return last_char_is_space || (name == start || (uint) (name - start) > NAME_LEN);
 }
 
 /*