tools/nxstyle.c: Add check for multiple definitions of local variables on a line.

fs/vfs/fs_open.c

@@ -186,7 +186,8 @@ int nx_vopen(FAR const char *path, int oflags, va_list ap)
    */
 
 #ifndef CONFIG_DISABLE_MOUNTPOINT
-  if ((!INODE_IS_DRIVER(inode) && !INODE_IS_MOUNTPT(inode)) || !inode->u.i_ops)
+  if ((!INODE_IS_DRIVER(inode) && !INODE_IS_MOUNTPT(inode)) ||
+      !inode->u.i_ops)
 #else
   if (!INODE_IS_DRIVER(inode) || !inode->u.i_ops)
 #endif
@@ -272,7 +273,8 @@ int nx_vopen(FAR const char *path, int oflags, va_list ap)
        */
 
       fd = (int)OPEN_GETFD(ret);
-      DEBUGASSERT((unsigned)fd < (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS));
+      DEBUGASSERT((unsigned)fd < (CONFIG_NFILE_DESCRIPTORS +
+                                  CONFIG_NSOCKET_DESCRIPTORS));
     }
 #endif
 

tools/nxstyle.c

@@ -355,6 +355,19 @@ int main(int argc, char **argv, char **envp)
             {
               declnest = 1;
             }
+
+          /* Check for multiple definitions of local variables on the line.
+           * NOTE:  Will miss multiple global variable definitions on a line,
+           * but this is because the heuristic is not smart enough to
+           * distingush a global variable from a function prototype.
+           */
+
+          if (indent > 0 && strchr(&line[indent], ',') != NULL)
+            {
+              fprintf(stderr,
+                      "Multiple data definitions on line %d\n",
+                      lineno);
+            }
         }
 
       /* Check for a keyword indicating the beginning of a statement.