tools/nxstyle.c;: Add check for blank lines before and after single line comments.

tools/README.txt

@@ -926,6 +926,21 @@ uncrustify.cfg
   it leaves it alone, but if the block comment is deemed to need a fix
   it starts erroneously indenting the continuation lines of the comment.
 
+    - uncrustify.cfg messed up the indent of most block comments.
+      cmt_sp_before_star_cont is applied inconsistently.  I added
+
+        cmt_indent_multi = false # disable all multi-line comment changes
+
+      to the .cfg file to limit its damage to block comments.
+    - It is very strict at wrapping lines at column 78. Even when column 79
+      just contained the '/' of a closing "*/".  That created many
+      bad continuation lines.
+    - It moved '{' that opened a struct to the line defining the struct.
+      nl_struct_brace = add (or force) seemed to be ignored.
+    - It also aligned variable names in declarations and '=' signs in
+      assignment statements in a seemingly arbitrary manner. Making changes
+      that were not necessary.
+
   NOTE: uncrustify.cfg should *ONLY* be used with new files that have an
   inconsistent coding style.  uncrustify.cfg should get you in the ballpark,
   but you should expect to review and hand-edit the files to assume 100%

tools/nxstyle.c

@@ -56,6 +56,7 @@ int main(int argc, char **argv, char **envp)
 {
   FILE *instream;
   char line[LINE_SIZE];
+  char *lptr;
   bool btabs;
   bool bfunctions;
   bool bstatm;
@@ -73,6 +74,9 @@ int main(int argc, char **argv, char **envp)
   int prevncomment;
   int n;
   int i;
+  int last_oneline_comment;
+  int last_blank_line;
+  int linelen;
 
   instream = fopen(argv[1], "r");
   if (!instream)
@@ -91,6 +95,9 @@ int main(int argc, char **argv, char **envp)
   declnest     = 0;
   prevdeclnest = 0;
   prevncomment = 0;
+  last_oneline_comment = -1; /* Line on which the last one line comment was
+                              * closed */
+  last_blank_line = -1;      /* lineno of last blank line */
 
   while (fgets(line, LINE_SIZE, instream))
     {
@@ -102,6 +109,22 @@ int main(int argc, char **argv, char **envp)
       bstatm       = false;
       bfor         = false;  /* REVISIT: Implies for() is all on one line */
 
+      /* Check for a blank line */
+
+      if (line[0] == '\n')
+        {
+          last_blank_line = lineno;
+        }
+      else /* this line is non-blank */
+        {
+          if (lineno == last_oneline_comment + 1)
+            {
+              fprintf(stderr,
+                      "Missing blank line after comment line. Found at line %d\n",
+                      last_oneline_comment);
+            }
+        }
+
       /* STEP 1: Find the indentation level and the start of real stuff on
        * the line.
        */
@@ -144,6 +167,27 @@ int main(int argc, char **argv, char **envp)
           continue;
         }
 
+      /* Check for a single line comment */
+
+      linelen = strlen(line);
+      if (linelen >= 5)      /* Minimum is slash, star, star, slash, newline */
+        {
+          lptr = strstr(line, "*/");
+          if (line[indent] == '/' && line[indent +1] == '*' &&
+              lptr - line == linelen - 3)
+            {
+              if (last_oneline_comment != lineno - 1 &&
+                  last_blank_line != lineno - 1)
+                {
+                  fprintf(stderr,
+                          "Missing blank line before comment found at line %d\n",
+                          lineno);
+                }
+
+              last_oneline_comment = lineno;
+            }
+        }
+
       /* Check for the comment block indicating the beginning of functions. */
 
       if (!bfunctions && ncomment > 0 &&